Merge remote-tracking branch 'upstream/master' into stdio

.github/workflows/codeql-analysis.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
 
     - name: Setup Java JDK
-      uses: actions/setup-java@v1.3.0
+      uses: actions/setup-java@v1
       with:
         java-version: 11
 

.idea/codeStyles/Project.xml

@@ -28,14 +28,46 @@
       </option>
       <option name="JD_P_AT_EMPTY_LINES" value="false" />
     </JavaCodeStyleSettings>
+    <JetCodeStyleSettings>
+      <option name="PACKAGES_TO_USE_STAR_IMPORTS">
+        <value>
+          <package name="java.util" alias="false" withSubpackages="false" />
+          <package name="kotlinx.android.synthetic" alias="false" withSubpackages="true" />
+          <package name="io.ktor" alias="false" withSubpackages="true" />
+        </value>
+      </option>
+      <option name="PACKAGES_IMPORT_LAYOUT">
+        <value>
+          <package name="" alias="false" withSubpackages="true" />
+          <package name="java" alias="false" withSubpackages="true" />
+          <package name="javax" alias="false" withSubpackages="true" />
+          <package name="kotlin" alias="false" withSubpackages="true" />
+          <package name="" alias="true" withSubpackages="true" />
+        </value>
+      </option>
+    </JetCodeStyleSettings>
     <XML>
       <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
     </XML>
     <codeStyleSettings language="JAVA">
+      <option name="RIGHT_MARGIN" value="120" />
+      <option name="KEEP_LINE_BREAKS" value="false" />
       <option name="KEEP_BLANK_LINES_IN_DECLARATIONS" value="1" />
       <option name="KEEP_BLANK_LINES_IN_CODE" value="1" />
       <option name="KEEP_BLANK_LINES_BEFORE_RBRACE" value="1" />
       <option name="BLANK_LINES_AFTER_CLASS_HEADER" value="1" />
+      <option name="CALL_PARAMETERS_WRAP" value="5" />
+      <option name="METHOD_PARAMETERS_WRAP" value="5" />
+      <option name="METHOD_PARAMETERS_LPAREN_ON_NEXT_LINE" value="true" />
+      <option name="METHOD_PARAMETERS_RPAREN_ON_NEXT_LINE" value="true" />
+      <option name="METHOD_CALL_CHAIN_WRAP" value="5" />
+      <option name="PARENTHESES_EXPRESSION_LPAREN_WRAP" value="true" />
+      <option name="PARENTHESES_EXPRESSION_RPAREN_WRAP" value="true" />
+      <option name="BINARY_OPERATION_WRAP" value="5" />
+      <option name="BINARY_OPERATION_SIGN_ON_NEXT_LINE" value="true" />
+      <option name="TERNARY_OPERATION_WRAP" value="5" />
+      <option name="TERNARY_OPERATION_SIGNS_ON_NEXT_LINE" value="true" />
+      <option name="ENUM_CONSTANTS_WRAP" value="2" />
     </codeStyleSettings>
     <codeStyleSettings language="XML">
       <arrangement>

CHANGELOG.md

@@ -0,0 +1,42 @@
+# Changelog
+
+## [Unreleased]
+
+## [0.7.1] - 2020-12-21
+### Added
+- Accept group invitation with `updateGroup -g GROUP_ID`
+- Decline group invitation with `quitGroup -g GROUP_ID`
+- Join group via invitation link `joinGroup --uri https://signal.group/#...`
+
+### Fixed
+- Include group ids for v2 groups in json output
+
+## [0.7.0] - 2020-12-15
+### Added
+Support for groups of new type/v2
+- Sending and receiving
+- Updating name, avatar and adding members with `updateGroup`
+- Quit group and decline invitation with `quitGroup`
+- In the `listGroups` output v2 groups can be recognized by the longer groupId
+
+**Attention**: For the new group support to work the native libzkgroup library is required.
+See https://github.com/AsamK/signal-cli/wiki/Provide-native-lib-for-libsignal for more information.
+
+### Fixed
+- Rare NullPointerException when receiving messages
+
+## [0.6.12] - 2020-11-22
+### Added
+- Show additional message content (view once, remote delete, mention, …) for received messages
+- `--captcha` parameter for `register` command, required for some IP ranges
+
+### Changed
+- Profile keys are now stored separately from contact list
+- Receipts from normal and unidentified messages now have the same format in json output
+
+### Fixed
+- Issue where some messages were sent with an old counter index
+
+## Older
+
+Look at the [release tags](https://github.com/AsamK/signal-cli/releases) for information about older releases.

build.gradle

@@ -7,7 +7,7 @@ targetCompatibility = JavaVersion.VERSION_11
 
 mainClassName = 'org.asamk.signal.Main'
 
-version = '0.6.11'
+version = '0.7.1'
 
 compileJava.options.encoding = 'UTF-8'
 
@@ -17,11 +17,11 @@ repositories {
 }
 
 dependencies {
-    implementation 'com.github.turasa:signal-service-java:2.15.3_unofficial_14'
-    implementation 'org.bouncycastle:bcprov-jdk15on:1.66'
+    implementation 'com.github.turasa:signal-service-java:2.15.3_unofficial_15'
+    implementation 'org.bouncycastle:bcprov-jdk15on:1.67'
     implementation 'net.sourceforge.argparse4j:argparse4j:0.8.1'
-    implementation 'com.github.hypfvieh:dbus-java:3.2.3'
-    implementation 'org.slf4j:slf4j-nop:1.7.30'
+    implementation 'com.github.hypfvieh:dbus-java:3.2.4'
+    implementation 'org.slf4j:slf4j-simple:1.7.30'
 }
 
 jar {

man/signal-cli.1.adoc

@@ -54,6 +54,12 @@ Use the verify command to complete the verification.
 *-v*, *--voice*::
 The verification should be done over voice, not SMS.
 
+*--captcha*::
+The captcha token, required if registration failed with a captcha required error.
+To get the token, go to https://signalcaptchas.org/registration/generate.html
+Check the developer tools for a redirect starting with signalcaptcha://
+Everything after signalcaptcha:// is the captcha token.
+
 === verify
 
 Verify the number using the code received via SMS or voice.
@@ -172,9 +178,17 @@ Don’t download attachments of received messages.
 *--json*::
 Output received messages in json format, one object per line.
 
+=== joinGroup
+
+Join a group via an invitation link.
+
+*--uri*::
+The invitation link URI (starts with `https://signal.group/#`)
+
 === updateGroup
 
 Create or update a group.
+If the user is a pending member, this command will accept the group invitation.
 
 *-g* GROUP, *--group* GROUP::
 Specify the recipient group ID in base64 encoding.
@@ -192,6 +206,7 @@ Specify one or more members to add to the group.
 === quitGroup
 
 Send a quit group message to all group members and remove self from member list.
+If the user is a pending member, this command will decline the group invitation.
 
 *-g* GROUP, *--group* GROUP::
 Specify the recipient group ID in base64 encoding.
@@ -229,7 +244,7 @@ Specify the safety number of the key, only use this option if you have verified
 
 Update the name and avatar image visible by message recipients for the current users.
 The profile is stored encrypted on the Signal servers.
-The decryption key is sent with every outgoing messages (excluding group messages).
+The decryption key is sent with every outgoing messages to contacts.
 
 *--name*::
 New name visible by message recipients.

src/main/java/org/asamk/Signal.java

@@ -13,13 +13,19 @@ import java.util.List;
  */
 public interface Signal extends DBusInterface {
 
-    long sendMessage(String message, List<String> attachments, String recipient) throws Error.AttachmentInvalid, Error.Failure, Error.InvalidNumber;
+    long sendMessage(
+            String message, List<String> attachments, String recipient
+    ) throws Error.AttachmentInvalid, Error.Failure, Error.InvalidNumber;
 
-    long sendMessage(String message, List<String> attachments, List<String> recipients) throws Error.AttachmentInvalid, Error.Failure, Error.InvalidNumber, Error.UnregisteredUser, Error.UntrustedIdentity;
+    long sendMessage(
+            String message, List<String> attachments, List<String> recipients
+    ) throws Error.AttachmentInvalid, Error.Failure, Error.InvalidNumber, Error.UnregisteredUser, Error.UntrustedIdentity;
 
     void sendEndSessionMessage(List<String> recipients) throws Error.Failure, Error.InvalidNumber, Error.UnregisteredUser, Error.UntrustedIdentity;
 
-    long sendGroupMessage(String message, List<String> attachments, byte[] groupId) throws Error.GroupNotFound, Error.Failure, Error.AttachmentInvalid, Error.UnregisteredUser, Error.UntrustedIdentity;
+    long sendGroupMessage(
+            String message, List<String> attachments, byte[] groupId
+    ) throws Error.GroupNotFound, Error.Failure, Error.AttachmentInvalid, Error.UnregisteredUser, Error.UntrustedIdentity;
 
     String getContactName(String number) throws Error.InvalidNumber;
 
@@ -35,7 +41,9 @@ public interface Signal extends DBusInterface {
 
     List<String> getGroupMembers(byte[] groupId);
 
-    byte[] updateGroup(byte[] groupId, String name, List<String> members, String avatar) throws Error.AttachmentInvalid, Error.Failure, Error.InvalidNumber, Error.GroupNotFound, Error.UnregisteredUser, Error.UntrustedIdentity;
+    byte[] updateGroup(
+            byte[] groupId, String name, List<String> members, String avatar
+    ) throws Error.AttachmentInvalid, Error.Failure, Error.InvalidNumber, Error.GroupNotFound, Error.UnregisteredUser, Error.UntrustedIdentity;
 
     boolean isRegistered();
 
@@ -47,7 +55,14 @@ public interface Signal extends DBusInterface {
         private final String message;
         private final List<String> attachments;
 
-        public MessageReceived(String objectpath, long timestamp, String sender, byte[] groupId, String message, List<String> attachments) throws DBusException {
+        public MessageReceived(
+                String objectpath,
+                long timestamp,
+                String sender,
+                byte[] groupId,
+                String message,
+                List<String> attachments
+        ) throws DBusException {
             super(objectpath, timestamp, sender, groupId, message, attachments);
             this.timestamp = timestamp;
             this.sender = sender;
@@ -106,7 +121,15 @@ public interface Signal extends DBusInterface {
         private final String message;
         private final List<String> attachments;
 
-        public SyncMessageReceived(String objectpath, long timestamp, String source, String destination, byte[] groupId, String message, List<String> attachments) throws DBusException {
+        public SyncMessageReceived(
+                String objectpath,
+                long timestamp,
+                String source,
+                String destination,
+                byte[] groupId,
+                String message,
+                List<String> attachments
+        ) throws DBusException {
             super(objectpath, timestamp, source, destination, groupId, message, attachments);
             this.timestamp = timestamp;
             this.source = source;

src/main/java/org/asamk/signal/JsonDbusReceiveMessageHandler.java

@@ -1,6 +1,7 @@
 package org.asamk.signal;
 
 import org.asamk.Signal;
+import org.asamk.signal.manager.GroupUtils;
 import org.asamk.signal.manager.Manager;
 import org.freedesktop.dbus.connections.impl.DBusConnection;
 import org.freedesktop.dbus.exceptions.DBusException;
@@ -29,30 +30,33 @@ public class JsonDbusReceiveMessageHandler extends JsonReceiveMessageHandler {
         this.objectPath = objectPath;
     }
 
-    static void sendReceivedMessageToDbus(SignalServiceEnvelope envelope, SignalServiceContent content, DBusConnection conn, final String objectPath, Manager m) {
+    static void sendReceivedMessageToDbus(
+            SignalServiceEnvelope envelope,
+            SignalServiceContent content,
+            DBusConnection conn,
+            final String objectPath,
+            Manager m
+    ) {
         if (envelope.isReceipt()) {
             try {
-                conn.sendMessage(new Signal.ReceiptReceived(
-                        objectPath,
-                        envelope.getTimestamp(),
+                conn.sendMessage(new Signal.ReceiptReceived(objectPath, envelope.getTimestamp(),
                         // A receipt envelope always has a source address
-                        envelope.getSourceAddress().getLegacyIdentifier()
-                ));
+                        envelope.getSourceAddress().getLegacyIdentifier()));
             } catch (DBusException e) {
                 e.printStackTrace();
             }
         } else if (content != null) {
-            final SignalServiceAddress sender = !envelope.isUnidentifiedSender() && envelope.hasSource() ? envelope.getSourceAddress() : content.getSender();
+            final SignalServiceAddress sender = !envelope.isUnidentifiedSender() && envelope.hasSource()
+                    ? envelope.getSourceAddress()
+                    : content.getSender();
             if (content.getReceiptMessage().isPresent()) {
                 final SignalServiceReceiptMessage receiptMessage = content.getReceiptMessage().get();
                 if (receiptMessage.isDeliveryReceipt()) {
                     for (long timestamp : receiptMessage.getTimestamps()) {
                         try {
-                            conn.sendMessage(new Signal.ReceiptReceived(
-                                    objectPath,
+                            conn.sendMessage(new Signal.ReceiptReceived(objectPath,
                                     timestamp,
-                                    sender.getLegacyIdentifier()
-                            ));
+                                    sender.getLegacyIdentifier()));
                         } catch (DBusException e) {
                             e.printStackTrace();
                         }
@@ -61,16 +65,17 @@ public class JsonDbusReceiveMessageHandler extends JsonReceiveMessageHandler {
             } else if (content.getDataMessage().isPresent()) {
                 SignalServiceDataMessage message = content.getDataMessage().get();
 
-                if (!message.isEndSession() &&
-                        !(message.getGroupContext().isPresent() &&
-                                message.getGroupContext().get().getGroupV1Type() != SignalServiceGroup.Type.DELIVER)) {
+                byte[] groupId = getGroupId(message);
+                if (!message.isEndSession() && (
+                        groupId == null
+                                || message.getGroupContext().get().getGroupV1Type() == null
+                                || message.getGroupContext().get().getGroupV1Type() == SignalServiceGroup.Type.DELIVER
+                )) {
                     try {
-                        conn.sendMessage(new Signal.MessageReceived(
-                                objectPath,
+                        conn.sendMessage(new Signal.MessageReceived(objectPath,
                                 message.getTimestamp(),
                                 sender.getLegacyIdentifier(),
-                                message.getGroupContext().isPresent() && message.getGroupContext().get().getGroupV1().isPresent()
-                                        ? message.getGroupContext().get().getGroupV1().get().getGroupId() : new byte[0],
+                                groupId != null ? groupId : new byte[0],
                                 message.getBody().isPresent() ? message.getBody().get() : "",
                                 JsonDbusReceiveMessageHandler.getAttachments(message, m)));
                     } catch (DBusException e) {
@@ -82,17 +87,20 @@ public class JsonDbusReceiveMessageHandler extends JsonReceiveMessageHandler {
                 if (sync_message.getSent().isPresent()) {
                     SentTranscriptMessage transcript = sync_message.getSent().get();
 
-                    if (transcript.getDestination().isPresent() || transcript.getMessage().getGroupContext().isPresent()) {
+                    if (transcript.getDestination().isPresent() || transcript.getMessage()
+                            .getGroupContext()
+                            .isPresent()) {
                         SignalServiceDataMessage message = transcript.getMessage();
+                        byte[] groupId = getGroupId(message);
 
                         try {
-                            conn.sendMessage(new Signal.SyncMessageReceived(
-                                    objectPath,
+                            conn.sendMessage(new Signal.SyncMessageReceived(objectPath,
                                     transcript.getTimestamp(),
                                     sender.getLegacyIdentifier(),
-                                    transcript.getDestination().isPresent() ? transcript.getDestination().get().getLegacyIdentifier() : "",
-                                    message.getGroupContext().isPresent() && message.getGroupContext().get().getGroupV1().isPresent()
-                                            ? message.getGroupContext().get().getGroupV1().get().getGroupId() : new byte[0],
+                                    transcript.getDestination().isPresent() ? transcript.getDestination()
+                                            .get()
+                                            .getLegacyIdentifier() : "",
+                                    groupId != null ? groupId : new byte[0],
                                     message.getBody().isPresent() ? message.getBody().get() : "",
                                     JsonDbusReceiveMessageHandler.getAttachments(message, m)));
                         } catch (DBusException e) {
@@ -104,6 +112,11 @@ public class JsonDbusReceiveMessageHandler extends JsonReceiveMessageHandler {
         }
     }
 
+    private static byte[] getGroupId(final SignalServiceDataMessage message) {
+        return message.getGroupContext().isPresent() ? GroupUtils.getGroupId(message.getGroupContext().get())
+                .serialize() : null;
+    }
+
     static private List<String> getAttachments(SignalServiceDataMessage message, Manager m) {
         List<String> attachments = new ArrayList<>();
         if (message.getAttachments().isPresent()) {

src/main/java/org/asamk/signal/JsonReceiveMessageHandler.java

@@ -35,7 +35,7 @@ public class JsonReceiveMessageHandler implements Manager.ReceiveMessageHandler
             result.putPOJO("error", new JsonError(exception));
         }
         if (envelope != null) {
-            result.putPOJO("envelope", new JsonMessageEnvelope(envelope, content));
+            result.putPOJO("envelope", new JsonMessageEnvelope(envelope, content, m));
         }
         try {
             jsonProcessor.writeValue(System.out, result);

src/main/java/org/asamk/signal/Main.java

@@ -41,6 +41,8 @@ import org.asamk.signal.util.SecurityProvider;
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
 import org.freedesktop.dbus.connections.impl.DBusConnection;
 import org.freedesktop.dbus.exceptions.DBusException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.whispersystems.signalservice.api.push.exceptions.AuthorizationFailedException;
 import org.whispersystems.signalservice.api.util.PhoneNumberFormatter;
 import org.whispersystems.signalservice.internal.configuration.SignalServiceConfiguration;
@@ -50,10 +52,10 @@ import java.io.IOException;
 import java.security.Security;
 import java.util.Map;
 
-import static org.whispersystems.signalservice.internal.util.Util.isEmpty;
-
 public class Main {
 
+    final static Logger logger = LoggerFactory.getLogger(Main.class);
+
     public static void main(String[] args) {
         installSecurityProviderWorkaround();
 
@@ -62,7 +64,7 @@ public class Main {
             System.exit(1);
         }
 
-        int res = handleCommands(ns);
+        int res = init(ns);
         System.exit(res);
     }
 
@@ -72,71 +74,81 @@ public class Main {
         Security.addProvider(new BouncyCastleProvider());
     }
 
-    private static int handleCommands(Namespace ns) {
+    public static int init(Namespace ns) {
+        if (ns.getBoolean("dbus") || ns.getBoolean("dbus_system")) {
+            return initDbusClient(ns, ns.getBoolean("dbus_system"));
+        }
+
         final String username = ns.getString("username");
 
-        if (ns.getBoolean("dbus") || ns.getBoolean("dbus_system")) {
-            try {
-                DBusConnection.DBusBusType busType;
-                if (ns.getBoolean("dbus_system")) {
-                    busType = DBusConnection.DBusBusType.SYSTEM;
-                } else {
-                    busType = DBusConnection.DBusBusType.SESSION;
-                }
-                try (DBusConnection dBusConn = DBusConnection.getConnection(busType)) {
-                    Signal ts = dBusConn.getRemoteObject(
-                            DbusConfig.SIGNAL_BUSNAME, DbusConfig.SIGNAL_OBJECTPATH,
-                            Signal.class);
-
-                    return handleCommands(ns, ts, dBusConn);
-                }
-            } catch (UnsatisfiedLinkError e) {
-                System.err.println("Missing native library dependency for dbus service: " + e.getMessage());
-                return 1;
-            } catch (DBusException | IOException e) {
-                e.printStackTrace();
-                return 3;
-            }
+        final File dataPath;
+        String config = ns.getString("config");
+        if (config != null) {
+            dataPath = new File(config);
         } else {
-            String dataPath = ns.getString("config");
-            if (isEmpty(dataPath)) {
-                dataPath = getDefaultDataPath();
-            }
+            dataPath = getDefaultDataPath();
+        }
 
-            final SignalServiceConfiguration serviceConfiguration = ServiceConfig.createDefaultServiceConfiguration(BaseConfig.USER_AGENT);
+        final SignalServiceConfiguration serviceConfiguration = ServiceConfig.createDefaultServiceConfiguration(
+                BaseConfig.USER_AGENT);
 
-            if (username == null) {
-                ProvisioningManager pm = new ProvisioningManager(dataPath, serviceConfiguration, BaseConfig.USER_AGENT);
-                return handleCommands(ns, pm);
-            }
+        if (!ServiceConfig.getCapabilities().isGv2()) {
+            logger.warn("WARNING: Support for new group V2 is disabled,"
+                    + " because the required native library dependency is missing: libzkgroup");
+        }
 
-            Manager manager;
+        if (username == null) {
+            ProvisioningManager pm = new ProvisioningManager(dataPath, serviceConfiguration, BaseConfig.USER_AGENT);
+            return handleCommands(ns, pm);
+        }
+
+        Manager manager;
+        try {
+            manager = Manager.init(username, dataPath, serviceConfiguration, BaseConfig.USER_AGENT);
+        } catch (Throwable e) {
+            logger.error("Error loading state file: {}", e.getMessage());
+            return 2;
+        }
+
+        try (Manager m = manager) {
             try {
-                manager = Manager.init(username, dataPath, serviceConfiguration, BaseConfig.USER_AGENT);
-            } catch (Throwable e) {
-                System.err.println("Error loading state file: " + e.getMessage());
+                m.checkAccountState();
+            } catch (AuthorizationFailedException e) {
+                if (!"register".equals(ns.getString("command"))) {
+                    // Register command should still be possible, if current authorization fails
+                    System.err.println("Authorization failed, was the number registered elsewhere?");
+                    return 2;
+                }
+            } catch (IOException e) {
+                logger.error("Error while checking account: {}", e.getMessage());
                 return 2;
             }
 
-            try (Manager m = manager) {
-                try {
-                    m.checkAccountState();
-                } catch (AuthorizationFailedException e) {
-                    if (!"register".equals(ns.getString("command"))) {
-                        // Register command should still be possible, if current authorization fails
-                        System.err.println("Authorization failed, was the number registered elsewhere?");
-                        return 2;
-                    }
-                } catch (IOException e) {
-                    System.err.println("Error while checking account: " + e.getMessage());
-                    return 2;
-                }
+            return handleCommands(ns, m);
+        } catch (IOException e) {
+            logger.error("Cleanup failed", e);
+            return 3;
+        }
+    }
 
-                return handleCommands(ns, m);
-            } catch (IOException e) {
-                e.printStackTrace();
-                return 3;
+    private static int initDbusClient(final Namespace ns, final boolean systemBus) {
+        try {
+            DBusConnection.DBusBusType busType;
+            if (systemBus) {
+                busType = DBusConnection.DBusBusType.SYSTEM;
+            } else {
+                busType = DBusConnection.DBusBusType.SESSION;
             }
+            try (DBusConnection dBusConn = DBusConnection.getConnection(busType)) {
+                Signal ts = dBusConn.getRemoteObject(DbusConfig.SIGNAL_BUSNAME,
+                        DbusConfig.SIGNAL_OBJECTPATH,
+                        Signal.class);
+
+                return handleCommands(ns, ts, dBusConn);
+            }
+        } catch (DBusException | IOException e) {
+            logger.error("Dbus client failed", e);
+            return 3;
         }
     }
 
@@ -199,19 +211,21 @@ public class Main {
      *
      * @return the data directory to be used by signal-cli.
      */
-    private static String getDefaultDataPath() {
-        String dataPath = IOUtils.getDataHomeDir() + "/signal-cli";
-        if (new File(dataPath).exists()) {
+    private static File getDefaultDataPath() {
+        File dataPath = new File(IOUtils.getDataHomeDir(), "signal-cli");
+        if (dataPath.exists()) {
             return dataPath;
         }
 
-        String legacySettingsPath = System.getProperty("user.home") + "/.config/signal";
-        if (new File(legacySettingsPath).exists()) {
+        File configPath = new File(System.getProperty("user.home"), ".config");
+
+        File legacySettingsPath = new File(configPath, "signal");
+        if (legacySettingsPath.exists()) {
             return legacySettingsPath;
         }
 
-        legacySettingsPath = System.getProperty("user.home") + "/.config/textsecure";
-        if (new File(legacySettingsPath).exists()) {
+        legacySettingsPath = new File(configPath, "textsecure");
+        if (legacySettingsPath.exists()) {
             return legacySettingsPath;
         }
 
@@ -219,39 +233,7 @@ public class Main {
     }
 
     private static Namespace parseArgs(String[] args) {
-        ArgumentParser parser = ArgumentParsers.newFor("signal-cli")
-                .build()
-                .defaultHelp(true)
-                .description("Commandline interface for Signal, patched to support sending messages from stdin and outputing reactions.")
-                .version(BaseConfig.PROJECT_NAME + " " + BaseConfig.PROJECT_VERSION);
-
-        parser.addArgument("-v", "--version")
-                .help("Show package version.")
-                .action(Arguments.version());
-        parser.addArgument("--config")
-                .help("Set the path, where to store the config (Default: $XDG_DATA_HOME/signal-cli , $HOME/.local/share/signal-cli).");
-
-        MutuallyExclusiveGroup mut = parser.addMutuallyExclusiveGroup();
-        mut.addArgument("-u", "--username")
-                .help("Specify your phone number, that will be used for verification.");
-        mut.addArgument("--dbus")
-                .help("Make request via user dbus.")
-                .action(Arguments.storeTrue());
-        mut.addArgument("--dbus-system")
-                .help("Make request via system dbus.")
-                .action(Arguments.storeTrue());
-
-        Subparsers subparsers = parser.addSubparsers()
-                .title("subcommands")
-                .dest("command")
-                .description("valid subcommands")
-                .help("additional help");
-
-        final Map<String, Command> commands = Commands.getCommands();
-        for (Map.Entry<String, Command> entry : commands.entrySet()) {
-            Subparser subparser = subparsers.addParser(entry.getKey());
-            entry.getValue().attachToSubparser(subparser);
-        }
+        ArgumentParser parser = buildArgumentParser();
 
         Namespace ns;
         try {
@@ -284,4 +266,34 @@ public class Main {
         }
         return ns;
     }
+
+    private static ArgumentParser buildArgumentParser() {
+        ArgumentParser parser = ArgumentParsers.newFor("signal-cli")
+                .build()
+                .defaultHelp(true)
+                .description("Commandline interface for Signal.")
+                .version(BaseConfig.PROJECT_NAME + " " + BaseConfig.PROJECT_VERSION);
+
+        parser.addArgument("-v", "--version").help("Show package version.").action(Arguments.version());
+        parser.addArgument("--config")
+                .help("Set the path, where to store the config (Default: $XDG_DATA_HOME/signal-cli , $HOME/.local/share/signal-cli).");
+
+        MutuallyExclusiveGroup mut = parser.addMutuallyExclusiveGroup();
+        mut.addArgument("-u", "--username").help("Specify your phone number, that will be used for verification.");
+        mut.addArgument("--dbus").help("Make request via user dbus.").action(Arguments.storeTrue());
+        mut.addArgument("--dbus-system").help("Make request via system dbus.").action(Arguments.storeTrue());
+
+        Subparsers subparsers = parser.addSubparsers()
+                .title("subcommands")
+                .dest("command")
+                .description("valid subcommands")
+                .help("additional help");
+
+        final Map<String, Command> commands = Commands.getCommands();
+        for (Map.Entry<String, Command> entry : commands.entrySet()) {
+            Subparser subparser = subparsers.addParser(entry.getKey());
+            entry.getValue().attachToSubparser(subparser);
+        }
+        return parser;
+    }
 }

src/main/java/org/asamk/signal/ReceiveMessageHandler.java

@@ -1,5 +1,7 @@
 package org.asamk.signal;
 
+import org.asamk.signal.manager.GroupId;
+import org.asamk.signal.manager.GroupUtils;
 import org.asamk.signal.manager.Manager;
 import org.asamk.signal.storage.contacts.ContactInfo;
 import org.asamk.signal.storage.groups.GroupInfo;
@@ -11,6 +13,8 @@ import org.whispersystems.signalservice.api.messages.SignalServiceContent;
 import org.whispersystems.signalservice.api.messages.SignalServiceDataMessage;
 import org.whispersystems.signalservice.api.messages.SignalServiceEnvelope;
 import org.whispersystems.signalservice.api.messages.SignalServiceGroup;
+import org.whispersystems.signalservice.api.messages.SignalServiceGroupContext;
+import org.whispersystems.signalservice.api.messages.SignalServiceGroupV2;
 import org.whispersystems.signalservice.api.messages.SignalServiceReceiptMessage;
 import org.whispersystems.signalservice.api.messages.SignalServiceTypingMessage;
 import org.whispersystems.signalservice.api.messages.calls.AnswerMessage;
@@ -22,6 +26,8 @@ import org.whispersystems.signalservice.api.messages.calls.SignalServiceCallMess
 import org.whispersystems.signalservice.api.messages.multidevice.BlockedListMessage;
 import org.whispersystems.signalservice.api.messages.multidevice.ConfigurationMessage;
 import org.whispersystems.signalservice.api.messages.multidevice.ContactsMessage;
+import org.whispersystems.signalservice.api.messages.multidevice.KeysMessage;
+import org.whispersystems.signalservice.api.messages.multidevice.MessageRequestResponseMessage;
 import org.whispersystems.signalservice.api.messages.multidevice.ReadMessage;
 import org.whispersystems.signalservice.api.messages.multidevice.SentTranscriptMessage;
 import org.whispersystems.signalservice.api.messages.multidevice.SignalServiceSyncMessage;
@@ -48,7 +54,9 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
         if (!envelope.isUnidentifiedSender() && envelope.hasSource()) {
             SignalServiceAddress source = envelope.getSourceAddress();
             ContactInfo sourceContact = m.getContact(source.getLegacyIdentifier());
-            System.out.println(String.format("Envelope from: %s (device: %d)", (sourceContact == null ? "" : "“" + sourceContact.name + "” ") + source.getLegacyIdentifier(), envelope.getSourceDevice()));
+            System.out.println(String.format("Envelope from: %s (device: %d)",
+                    (sourceContact == null ? "" : "“" + sourceContact.name + "” ") + source.getLegacyIdentifier(),
+                    envelope.getSourceDevice()));
             if (source.getRelay().isPresent()) {
                 System.out.println("Relayed by: " + source.getRelay().get());
             }
@@ -66,18 +74,35 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
             if (exception != null) {
                 if (exception instanceof org.whispersystems.libsignal.UntrustedIdentityException) {
                     org.whispersystems.libsignal.UntrustedIdentityException e = (org.whispersystems.libsignal.UntrustedIdentityException) exception;
-                    System.out.println("The user’s key is untrusted, either the user has reinstalled Signal or a third party sent this message.");
-                    System.out.println("Use 'signal-cli -u " + m.getUsername() + " listIdentities -n " + e.getName() + "', verify the key and run 'signal-cli -u " + m.getUsername() + " trust -v \"FINGER_PRINT\" " + e.getName() + "' to mark it as trusted");
-                    System.out.println("If you don't care about security, use 'signal-cli -u " + m.getUsername() + " trust -a " + e.getName() + "' to trust it without verification");
+                    System.out.println(
+                            "The user’s key is untrusted, either the user has reinstalled Signal or a third party sent this message.");
+                    System.out.println("Use 'signal-cli -u "
+                            + m.getUsername()
+                            + " listIdentities -n "
+                            + e.getName()
+                            + "', verify the key and run 'signal-cli -u "
+                            + m.getUsername()
+                            + " trust -v \"FINGER_PRINT\" "
+                            + e.getName()
+                            + "' to mark it as trusted");
+                    System.out.println("If you don't care about security, use 'signal-cli -u "
+                            + m.getUsername()
+                            + " trust -a "
+                            + e.getName()
+                            + "' to trust it without verification");
                 } else {
-                    System.out.println("Exception: " + exception.getMessage() + " (" + exception.getClass().getSimpleName() + ")");
+                    System.out.println("Exception: " + exception.getMessage() + " (" + exception.getClass()
+                            .getSimpleName() + ")");
                 }
             }
             if (content == null) {
                 System.out.println("Failed to decrypt message.");
             } else {
                 ContactInfo sourceContact = m.getContact(content.getSender().getLegacyIdentifier());
-                System.out.println(String.format("Sender: %s (device: %d)", (sourceContact == null ? "" : "“" + sourceContact.name + "” ") + content.getSender().getLegacyIdentifier(), content.getSenderDevice()));
+                System.out.println(String.format("Sender: %s (device: %d)",
+                        (sourceContact == null ? "" : "“" + sourceContact.name + "” ") + content.getSender()
+                                .getLegacyIdentifier(),
+                        content.getSenderDevice()));
                 if (content.getDataMessage().isPresent()) {
                     SignalServiceDataMessage message = content.getDataMessage().get();
                     handleSignalServiceDataMessage(message);
@@ -103,7 +128,11 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
                         System.out.println("Received sync read messages list");
                         for (ReadMessage rm : syncMessage.getRead().get()) {
                             ContactInfo fromContact = m.getContact(rm.getSender().getLegacyIdentifier());
-                            System.out.println("From: " + (fromContact == null ? "" : "“" + fromContact.name + "” ") + rm.getSender().getLegacyIdentifier() + " Message timestamp: " + DateUtils.formatTimestamp(rm.getTimestamp()));
+                            System.out.println("From: "
+                                    + (fromContact == null ? "" : "“" + fromContact.name + "” ")
+                                    + rm.getSender().getLegacyIdentifier()
+                                    + " Message timestamp: "
+                                    + DateUtils.formatTimestamp(rm.getTimestamp()));
                         }
                     }
                     if (syncMessage.getRequest().isPresent()) {
@@ -136,15 +165,19 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
                             StringBuilder toBuilder = new StringBuilder();
                             for (SignalServiceAddress dest : sentTranscriptMessage.getRecipients()) {
                                 ContactInfo destContact = m.getContact(dest.getLegacyIdentifier());
-                                toBuilder.append(destContact == null ? "" : "“" + destContact.name + "” ").append(dest.getLegacyIdentifier()).append(" ");
+                                toBuilder.append(destContact == null ? "" : "“" + destContact.name + "” ")
+                                        .append(dest.getLegacyIdentifier())
+                                        .append(" ");
                             }
                             to = toBuilder.toString();
                         } else {
                             to = "Unknown";
                         }
-                        System.out.println("To: " + to + " , Message timestamp: " + DateUtils.formatTimestamp(sentTranscriptMessage.getTimestamp()));
+                        System.out.println("To: " + to + " , Message timestamp: " + DateUtils.formatTimestamp(
+                                sentTranscriptMessage.getTimestamp()));
                         if (sentTranscriptMessage.getExpirationStartTimestamp() > 0) {
-                            System.out.println("Expiration started at: " + DateUtils.formatTimestamp(sentTranscriptMessage.getExpirationStartTimestamp()));
+                            System.out.println("Expiration started at: " + DateUtils.formatTimestamp(
+                                    sentTranscriptMessage.getExpirationStartTimestamp()));
                         }
                         SignalServiceDataMessage message = sentTranscriptMessage.getMessage();
                         handleSignalServiceDataMessage(message);
@@ -160,15 +193,38 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
                     if (syncMessage.getVerified().isPresent()) {
                         System.out.println("Received sync message with verified identities:");
                         final VerifiedMessage verifiedMessage = syncMessage.getVerified().get();
-                        System.out.println(" - " + verifiedMessage.getDestination() + ": " + verifiedMessage.getVerified());
-                        String safetyNumber = Util.formatSafetyNumber(m.computeSafetyNumber(verifiedMessage.getDestination(), verifiedMessage.getIdentityKey()));
+                        System.out.println(" - "
+                                + verifiedMessage.getDestination()
+                                + ": "
+                                + verifiedMessage.getVerified());
+                        String safetyNumber = Util.formatSafetyNumber(m.computeSafetyNumber(verifiedMessage.getDestination(),
+                                verifiedMessage.getIdentityKey()));
                         System.out.println("   " + safetyNumber);
                     }
                     if (syncMessage.getConfiguration().isPresent()) {
                         System.out.println("Received sync message with configuration:");
                         final ConfigurationMessage configurationMessage = syncMessage.getConfiguration().get();
                         if (configurationMessage.getReadReceipts().isPresent()) {
-                            System.out.println(" - Read receipts: " + (configurationMessage.getReadReceipts().get() ? "enabled" : "disabled"));
+                            System.out.println(" - Read receipts: " + (
+                                    configurationMessage.getReadReceipts().get() ? "enabled" : "disabled"
+                            ));
+                        }
+                        if (configurationMessage.getLinkPreviews().isPresent()) {
+                            System.out.println(" - Link previews: " + (
+                                    configurationMessage.getLinkPreviews().get() ? "enabled" : "disabled"
+                            ));
+                        }
+                        if (configurationMessage.getTypingIndicators().isPresent()) {
+                            System.out.println(" - Typing indicators: " + (
+                                    configurationMessage.getTypingIndicators().get() ? "enabled" : "disabled"
+                            ));
+                        }
+                        if (configurationMessage.getUnidentifiedDeliveryIndicators().isPresent()) {
+                            System.out.println(" - Unidentified Delivery Indicators: " + (
+                                    configurationMessage.getUnidentifiedDeliveryIndicators().get()
+                                            ? "enabled"
+                                            : "disabled"
+                            ));
                         }
                     }
                     if (syncMessage.getFetchType().isPresent()) {
@@ -182,7 +238,8 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
                         System.out.println(" - Timestamp:" + viewOnceOpenMessage.getTimestamp());
                     }
                     if (syncMessage.getStickerPackOperations().isPresent()) {
-                        final List<StickerPackOperationMessage> stickerPackOperationMessages = syncMessage.getStickerPackOperations().get();
+                        final List<StickerPackOperationMessage> stickerPackOperationMessages = syncMessage.getStickerPackOperations()
+                                .get();
                         System.out.println("Received sync message with sticker pack operations:");
                         for (StickerPackOperationMessage m : stickerPackOperationMessages) {
                             System.out.println(" - " + m.getType().toString());
@@ -194,6 +251,32 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
                             }
                         }
                     }
+                    if (syncMessage.getMessageRequestResponse().isPresent()) {
+                        final MessageRequestResponseMessage requestResponseMessage = syncMessage.getMessageRequestResponse()
+                                .get();
+                        System.out.println("Received message request response:");
+                        System.out.println("  Type: " + requestResponseMessage.getType());
+                        if (requestResponseMessage.getGroupId().isPresent()) {
+                            System.out.println("  Group id: " + Base64.encodeBytes(requestResponseMessage.getGroupId()
+                                    .get()));
+                        }
+                        if (requestResponseMessage.getPerson().isPresent()) {
+                            System.out.println("  Person: " + requestResponseMessage.getPerson()
+                                    .get()
+                                    .getLegacyIdentifier());
+                        }
+                    }
+                    if (syncMessage.getKeys().isPresent()) {
+                        final KeysMessage keysMessage = syncMessage.getKeys().get();
+                        System.out.println("Received sync message with keys:");
+                        if (keysMessage.getStorageService().isPresent()) {
+                            System.out.println("  With storage key length: " + keysMessage.getStorageService()
+                                    .get()
+                                    .serialize().length);
+                        } else {
+                            System.out.println("  With empty storage key");
+                        }
+                    }
                 }
                 if (content.getCallMessage().isPresent()) {
                     System.out.println("Received a call message");
@@ -213,7 +296,10 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
                     if (callMessage.getIceUpdateMessages().isPresent()) {
                         List<IceUpdateMessage> iceUpdateMessages = callMessage.getIceUpdateMessages().get();
                         for (IceUpdateMessage iceUpdateMessage : iceUpdateMessages) {
-                            System.out.println("Ice update message: " + iceUpdateMessage.getId() + ", sdp: " + iceUpdateMessage.getSdp());
+                            System.out.println("Ice update message: "
+                                    + iceUpdateMessage.getId()
+                                    + ", sdp: "
+                                    + iceUpdateMessage.getSdp());
                         }
                     }
                     if (callMessage.getOfferMessage().isPresent()) {
@@ -242,11 +328,14 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
                     System.out.println(" - Action: " + typingMessage.getAction());
                     System.out.println(" - Timestamp: " + DateUtils.formatTimestamp(typingMessage.getTimestamp()));
                     if (typingMessage.getGroupId().isPresent()) {
-                        GroupInfo group = m.getGroup(typingMessage.getGroupId().get());
+                        System.out.println(" - Group Info:");
+                        final GroupId groupId = GroupId.unknownVersion(typingMessage.getGroupId().get());
+                        System.out.println("   Id: " + groupId.toBase64());
+                        GroupInfo group = m.getGroup(groupId);
                         if (group != null) {
-                            System.out.println("  Name: " + group.name);
+                            System.out.println("   Name: " + group.getTitle());
                         } else {
-                            System.out.println("  Name: <Unknown group>");
+                            System.out.println("   Name: <Unknown group>");
                         }
                     }
                 }
@@ -259,38 +348,57 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
 
     private void handleSignalServiceDataMessage(SignalServiceDataMessage message) {
         System.out.println("Message timestamp: " + DateUtils.formatTimestamp(message.getTimestamp()));
+        if (message.isViewOnce()) {
+            System.out.println("=VIEW ONCE=");
+        }
 
         if (message.getBody().isPresent()) {
             System.out.println("Body: " + message.getBody().get());
         }
-        if (message.getGroupContext().isPresent() && message.getGroupContext().get().getGroupV1().isPresent()) {
-            SignalServiceGroup groupInfo = message.getGroupContext().get().getGroupV1().get();
+        if (message.getGroupContext().isPresent()) {
             System.out.println("Group info:");
-            System.out.println("  Id: " + Base64.encodeBytes(groupInfo.getGroupId()));
-            if (groupInfo.getType() == SignalServiceGroup.Type.UPDATE && groupInfo.getName().isPresent()) {
-                System.out.println("  Name: " + groupInfo.getName().get());
-            } else {
-                GroupInfo group = m.getGroup(groupInfo.getGroupId());
+            final SignalServiceGroupContext groupContext = message.getGroupContext().get();
+            final GroupId groupId = GroupUtils.getGroupId(groupContext);
+            if (groupContext.getGroupV1().isPresent()) {
+                SignalServiceGroup groupInfo = groupContext.getGroupV1().get();
+                System.out.println("  Id: " + groupId.toBase64());
+                if (groupInfo.getType() == SignalServiceGroup.Type.UPDATE && groupInfo.getName().isPresent()) {
+                    System.out.println("  Name: " + groupInfo.getName().get());
+                } else {
+                    GroupInfo group = m.getGroup(groupId);
+                    if (group != null) {
+                        System.out.println("  Name: " + group.getTitle());
+                    } else {
+                        System.out.println("  Name: <Unknown group>");
+                    }
+                }
+                System.out.println("  Type: " + groupInfo.getType());
+                if (groupInfo.getMembers().isPresent()) {
+                    for (SignalServiceAddress member : groupInfo.getMembers().get()) {
+                        System.out.println("  Member: " + member.getLegacyIdentifier());
+                    }
+                }
+                if (groupInfo.getAvatar().isPresent()) {
+                    System.out.println("  Avatar:");
+                    printAttachment(groupInfo.getAvatar().get());
+                }
+            } else if (groupContext.getGroupV2().isPresent()) {
+                final SignalServiceGroupV2 groupInfo = groupContext.getGroupV2().get();
+                System.out.println("  Id: " + groupId.toBase64());
+                GroupInfo group = m.getGroup(groupId);
                 if (group != null) {
-                    System.out.println("  Name: " + group.name);
+                    System.out.println("  Name: " + group.getTitle());
                 } else {
                     System.out.println("  Name: <Unknown group>");
                 }
-            }
-            System.out.println("  Type: " + groupInfo.getType());
-            if (groupInfo.getMembers().isPresent()) {
-                for (SignalServiceAddress member : groupInfo.getMembers().get()) {
-                    System.out.println("  Member: " + member.getLegacyIdentifier());
-                }
-            }
-            if (groupInfo.getAvatar().isPresent()) {
-                System.out.println("  Avatar:");
-                printAttachment(groupInfo.getAvatar().get());
+                System.out.println("  Revision: " + groupInfo.getRevision());
+                System.out.println("  Master key length: " + groupInfo.getMasterKey().serialize().length);
+                System.out.println("  Has signed group change: " + groupInfo.hasSignedGroupChange());
             }
         }
         if (message.getPreviews().isPresent()) {
             final List<SignalServiceDataMessage.Preview> previews = message.getPreviews().get();
-            System.out.println("Previes:");
+            System.out.println("Previews:");
             for (SignalServiceDataMessage.Preview preview : previews) {
                 System.out.println(" - Title: " + preview.getTitle());
                 System.out.println(" - Url: " + preview.getUrl());
@@ -332,7 +440,8 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
             final SignalServiceDataMessage.Reaction reaction = message.getReaction().get();
             System.out.println("Reaction:");
             System.out.println(" - Emoji: " + reaction.getEmoji());
-            System.out.println(" - Target author: " + reaction.getTargetAuthor().getLegacyIdentifier()); // todo resolve
+            System.out.println(" - Target author: " + m.resolveSignalServiceAddress(reaction.getTargetAuthor())
+                    .getLegacyIdentifier());
             System.out.println(" - Target timestamp: " + reaction.getTargetSentTimestamp());
             System.out.println(" - Is remove: " + reaction.isRemove());
         }
@@ -340,14 +449,20 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
         if (message.getQuote().isPresent()) {
             SignalServiceDataMessage.Quote quote = message.getQuote().get();
             System.out.println("Quote: (" + quote.getId() + ")");
-            System.out.println(" Author: " + quote.getAuthor().getLegacyIdentifier());
+            System.out.println(" Author: " + m.resolveSignalServiceAddress(quote.getAuthor()).getLegacyIdentifier());
             System.out.println(" Text: " + quote.getText());
+            if (quote.getMentions() != null && quote.getMentions().size() > 0) {
+                System.out.println(" Mentions: ");
+                for (SignalServiceDataMessage.Mention mention : quote.getMentions()) {
+                    printMention(mention, m);
+                }
+            }
             if (quote.getAttachments().size() > 0) {
                 System.out.println(" Attachments: ");
                 for (SignalServiceDataMessage.Quote.QuotedAttachment attachment : quote.getAttachments()) {
-                    System.out.println("  Filename: " + attachment.getFileName());
-                    System.out.println("  Type: " + attachment.getContentType());
-                    System.out.println("  Thumbnail:");
+                    System.out.println(" - Filename: " + attachment.getFileName());
+                    System.out.println("   Type: " + attachment.getContentType());
+                    System.out.println("   Thumbnail:");
                     if (attachment.getThumbnail() != null) {
                         printAttachment(attachment.getThumbnail());
                     }
@@ -355,6 +470,17 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
             }
         }
 
+        if (message.getRemoteDelete().isPresent()) {
+            final SignalServiceDataMessage.RemoteDelete remoteDelete = message.getRemoteDelete().get();
+            System.out.println("Remote delete message: timestamp = " + remoteDelete.getTargetSentTimestamp());
+        }
+        if (message.getMentions().isPresent()) {
+            System.out.println("Mentions: ");
+            for (SignalServiceDataMessage.Mention mention : message.getMentions().get()) {
+                printMention(mention, m);
+            }
+        }
+
         if (message.getAttachments().isPresent()) {
             System.out.println("Attachments: ");
             for (SignalServiceAttachment attachment : message.getAttachments().get()) {
@@ -363,13 +489,28 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
         }
     }
 
+    private void printMention(SignalServiceDataMessage.Mention mention, Manager m) {
+        System.out.println("- " + m.resolveSignalServiceAddress(new SignalServiceAddress(mention.getUuid(), null))
+                .getLegacyIdentifier() + ": " + mention.getStart() + " (length: " + mention.getLength() + ")");
+    }
+
     private void printAttachment(SignalServiceAttachment attachment) {
-        System.out.println("- " + attachment.getContentType() + " (" + (attachment.isPointer() ? "Pointer" : "") + (attachment.isStream() ? "Stream" : "") + ")");
+        System.out.println("- " + attachment.getContentType() + " (" + (attachment.isPointer() ? "Pointer" : "") + (
+                attachment.isStream() ? "Stream" : ""
+        ) + ")");
         if (attachment.isPointer()) {
             final SignalServiceAttachmentPointer pointer = attachment.asPointer();
             System.out.println("  Id: " + pointer.getRemoteId() + " Key length: " + pointer.getKey().length);
-            System.out.println("  Filename: " + (pointer.getFileName().isPresent() ? pointer.getFileName().get() : "-"));
-            System.out.println("  Size: " + (pointer.getSize().isPresent() ? pointer.getSize().get() + " bytes" : "<unavailable>") + (pointer.getPreview().isPresent() ? " (Preview is available: " + pointer.getPreview().get().length + " bytes)" : ""));
+            System.out.println("  Filename: " + (
+                    pointer.getFileName().isPresent() ? pointer.getFileName().get() : "-"
+            ));
+            System.out.println("  Size: " + (
+                    pointer.getSize().isPresent() ? pointer.getSize().get() + " bytes" : "<unavailable>"
+            ) + (
+                    pointer.getPreview().isPresent() ? " (Preview is available: "
+                            + pointer.getPreview().get().length
+                            + " bytes)" : ""
+            ));
             System.out.println("  Voice note: " + (pointer.getVoiceNote() ? "yes" : "no"));
             System.out.println("  Dimensions: " + pointer.getWidth() + "x" + pointer.getHeight());
             File file = m.getAttachmentFile(pointer.getRemoteId());

src/main/java/org/asamk/signal/commands/BlockCommand.java

@@ -3,9 +3,10 @@ package org.asamk.signal.commands;
 import net.sourceforge.argparse4j.inf.Namespace;
 import net.sourceforge.argparse4j.inf.Subparser;
 
+import org.asamk.signal.manager.GroupId;
+import org.asamk.signal.manager.GroupIdFormatException;
 import org.asamk.signal.manager.GroupNotFoundException;
 import org.asamk.signal.manager.Manager;
-import org.asamk.signal.util.GroupIdFormatException;
 import org.asamk.signal.util.Util;
 import org.whispersystems.signalservice.api.util.InvalidNumberException;
 
@@ -13,12 +14,8 @@ public class BlockCommand implements LocalCommand {
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        subparser.addArgument("contact")
-                .help("Contact number")
-                .nargs("*");
-        subparser.addArgument("-g", "--group")
-                .help("Group ID")
-                .nargs("*");
+        subparser.addArgument("contact").help("Contact number").nargs("*");
+        subparser.addArgument("-g", "--group").help("Group ID").nargs("*");
         subparser.help("Block the given contacts or groups (no messages will be received)");
     }
 
@@ -40,7 +37,7 @@ public class BlockCommand implements LocalCommand {
         if (ns.<String>getList("group") != null) {
             for (String groupIdString : ns.<String>getList("group")) {
                 try {
-                    byte[] groupId = Util.decodeGroupId(groupIdString);
+                    GroupId groupId = Util.decodeGroupId(groupIdString);
                     m.setGroupBlocked(groupId, true);
                 } catch (GroupIdFormatException | GroupNotFoundException e) {
                     System.err.println(e.getMessage());

src/main/java/org/asamk/signal/commands/Commands.java

@@ -17,6 +17,7 @@ public class Commands {
         addCommand("listDevices", new ListDevicesCommand());
         addCommand("listGroups", new ListGroupsCommand());
         addCommand("listIdentities", new ListIdentitiesCommand());
+        addCommand("joinGroup", new JoinGroupCommand());
         addCommand("quitGroup", new QuitGroupCommand());
         addCommand("receive", new ReceiveCommand());
         addCommand("register", new RegisterCommand());

src/main/java/org/asamk/signal/commands/DaemonCommand.java

@@ -60,7 +60,13 @@ public class DaemonCommand implements LocalCommand {
             }
             boolean ignoreAttachments = ns.getBoolean("ignore_attachments");
             try {
-                m.receiveMessages(1, TimeUnit.HOURS, false, ignoreAttachments, ns.getBoolean("json") ? new JsonDbusReceiveMessageHandler(m, conn, SIGNAL_OBJECTPATH) : new DbusReceiveMessageHandler(m, conn, SIGNAL_OBJECTPATH));
+                m.receiveMessages(1,
+                        TimeUnit.HOURS,
+                        false,
+                        ignoreAttachments,
+                        ns.getBoolean("json")
+                                ? new JsonDbusReceiveMessageHandler(m, conn, SIGNAL_OBJECTPATH)
+                                : new DbusReceiveMessageHandler(m, conn, SIGNAL_OBJECTPATH));
                 return 0;
             } catch (IOException e) {
                 System.err.println("Error while receiving messages: " + e.getMessage());

src/main/java/org/asamk/signal/commands/JoinGroupCommand.java

@@ -0,0 +1,84 @@
+package org.asamk.signal.commands;
+
+import net.sourceforge.argparse4j.inf.Namespace;
+import net.sourceforge.argparse4j.inf.Subparser;
+
+import org.asamk.Signal;
+import org.asamk.signal.manager.GroupId;
+import org.asamk.signal.manager.GroupInviteLinkUrl;
+import org.asamk.signal.manager.Manager;
+import org.freedesktop.dbus.exceptions.DBusExecutionException;
+import org.whispersystems.libsignal.util.Pair;
+import org.whispersystems.signalservice.api.groupsv2.GroupLinkNotActiveException;
+import org.whispersystems.signalservice.api.messages.SendMessageResult;
+import org.whispersystems.signalservice.internal.push.exceptions.GroupPatchNotAcceptedException;
+
+import java.io.IOException;
+import java.util.List;
+
+import static org.asamk.signal.util.ErrorUtils.handleAssertionError;
+import static org.asamk.signal.util.ErrorUtils.handleIOException;
+import static org.asamk.signal.util.ErrorUtils.handleTimestampAndSendMessageResults;
+
+public class JoinGroupCommand implements LocalCommand {
+
+    @Override
+    public void attachToSubparser(final Subparser subparser) {
+        subparser.addArgument("--uri").required(true).help("Specify the uri with the group invitation link.");
+    }
+
+    @Override
+    public int handleCommand(final Namespace ns, final Manager m) {
+        if (!m.isRegistered()) {
+            System.err.println("User is not registered.");
+            return 1;
+        }
+
+        final GroupInviteLinkUrl linkUrl;
+        String uri = ns.getString("uri");
+        try {
+            linkUrl = GroupInviteLinkUrl.fromUri(uri);
+        } catch (GroupInviteLinkUrl.InvalidGroupLinkException e) {
+            System.err.println("Group link is invalid: " + e.getMessage());
+            return 2;
+        } catch (GroupInviteLinkUrl.UnknownGroupLinkVersionException e) {
+            System.err.println("Group link was created with an incompatible version: " + e.getMessage());
+            return 2;
+        }
+
+        if (linkUrl == null) {
+            System.err.println("Link is not a signal group invitation link");
+            return 2;
+        }
+
+        try {
+            final Pair<GroupId, List<SendMessageResult>> results = m.joinGroup(linkUrl);
+            GroupId newGroupId = results.first();
+            if (!m.getGroup(newGroupId).isMember(m.getSelfAddress())) {
+                System.out.println("Requested to join group \"" + newGroupId.toBase64() + "\"");
+            } else {
+                System.out.println("Joined group \"" + newGroupId.toBase64() + "\"");
+            }
+            return handleTimestampAndSendMessageResults(0, results.second());
+        } catch (AssertionError e) {
+            handleAssertionError(e);
+            return 1;
+        } catch (GroupPatchNotAcceptedException e) {
+            System.err.println("Failed to join group, maybe already a member");
+            return 1;
+        } catch (IOException e) {
+            e.printStackTrace();
+            handleIOException(e);
+            return 1;
+        } catch (Signal.Error.AttachmentInvalid e) {
+            System.err.println("Failed to add avatar attachment for group\": " + e.getMessage());
+            return 1;
+        } catch (DBusExecutionException e) {
+            System.err.println("Failed to send message: " + e.getMessage());
+            return 1;
+        } catch (GroupLinkNotActiveException e) {
+            System.err.println("Group link is not valid: " + e.getMessage());
+            return 2;
+        }
+    }
+}

src/main/java/org/asamk/signal/commands/LinkCommand.java

@@ -16,8 +16,7 @@ public class LinkCommand implements ProvisioningCommand {
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        subparser.addArgument("-n", "--name")
-                .help("Specify a name to describe this new device.");
+        subparser.addArgument("-n", "--name").help("Specify a name to describe this new device.");
     }
 
     @Override
@@ -43,7 +42,11 @@ public class LinkCommand implements ProvisioningCommand {
             e.printStackTrace();
             return 2;
         } catch (UserAlreadyExists e) {
-            System.err.println("The user " + e.getUsername() + " already exists\nDelete \"" + e.getFileName() + "\" before trying again.");
+            System.err.println("The user "
+                    + e.getUsername()
+                    + " already exists\nDelete \""
+                    + e.getFileName()
+                    + "\" before trying again.");
             return 1;
         }
         return 0;

src/main/java/org/asamk/signal/commands/ListDevicesCommand.java

@@ -25,7 +25,10 @@ public class ListDevicesCommand implements LocalCommand {
         try {
             List<DeviceInfo> devices = m.getLinkedDevices();
             for (DeviceInfo d : devices) {
-                System.out.println("Device " + d.getId() + (d.getId() == m.getDeviceId() ? " (this device)" : "") + ":");
+                System.out.println("Device "
+                        + d.getId()
+                        + (d.getId() == m.getDeviceId() ? " (this device)" : "")
+                        + ":");
                 System.out.println(" Name: " + d.getName());
                 System.out.println(" Created: " + DateUtils.formatTimestamp(d.getCreated()));
                 System.out.println(" Last seen: " + DateUtils.formatTimestamp(d.getLastSeen()));

src/main/java/org/asamk/signal/commands/ListGroupsCommand.java

@@ -4,29 +4,61 @@ import net.sourceforge.argparse4j.impl.Arguments;
 import net.sourceforge.argparse4j.inf.Namespace;
 import net.sourceforge.argparse4j.inf.Subparser;
 
+import org.asamk.signal.manager.GroupInviteLinkUrl;
 import org.asamk.signal.manager.Manager;
 import org.asamk.signal.storage.groups.GroupInfo;
 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
-import org.whispersystems.util.Base64;
 
 import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
 
 public class ListGroupsCommand implements LocalCommand {
 
-    private static void printGroup(GroupInfo group, boolean detailed, SignalServiceAddress address) {
+    private static void printGroup(Manager m, GroupInfo group, boolean detailed) {
         if (detailed) {
-            System.out.println(String.format("Id: %s Name: %s  Active: %s Blocked: %b Members: %s",
-                    Base64.encodeBytes(group.groupId), group.name, group.isMember(address), group.blocked, group.getMembersE164()));
+            Set<String> members = group.getMembers()
+                    .stream()
+                    .map(m::resolveSignalServiceAddress)
+                    .map(SignalServiceAddress::getLegacyIdentifier)
+                    .collect(Collectors.toSet());
+
+            Set<String> pendingMembers = group.getPendingMembers()
+                    .stream()
+                    .map(m::resolveSignalServiceAddress)
+                    .map(SignalServiceAddress::getLegacyIdentifier)
+                    .collect(Collectors.toSet());
+
+            Set<String> requestingMembers = group.getRequestingMembers()
+                    .stream()
+                    .map(m::resolveSignalServiceAddress)
+                    .map(SignalServiceAddress::getLegacyIdentifier)
+                    .collect(Collectors.toSet());
+
+            final GroupInviteLinkUrl groupInviteLink = group.getGroupInviteLink();
+
+            System.out.println(String.format(
+                    "Id: %s Name: %s  Active: %s Blocked: %b Members: %s Pending members: %s Requesting members: %s Link: %s",
+                    group.getGroupId().toBase64(),
+                    group.getTitle(),
+                    group.isMember(m.getSelfAddress()),
+                    group.isBlocked(),
+                    members,
+                    pendingMembers,
+                    requestingMembers,
+                    groupInviteLink == null ? '-' : groupInviteLink.getUrl()));
         } else {
             System.out.println(String.format("Id: %s Name: %s  Active: %s Blocked: %b",
-                    Base64.encodeBytes(group.groupId), group.name, group.isMember(address), group.blocked));
+                    group.getGroupId().toBase64(),
+                    group.getTitle(),
+                    group.isMember(m.getSelfAddress()),
+                    group.isBlocked()));
         }
     }
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        subparser.addArgument("-d", "--detailed").action(Arguments.storeTrue())
-                .help("List members of each group");
+        subparser.addArgument("-d", "--detailed").action(Arguments.storeTrue()).help("List members of each group");
         subparser.help("List group name and ids");
     }
 
@@ -41,7 +73,7 @@ public class ListGroupsCommand implements LocalCommand {
         boolean detailed = ns.getBoolean("detailed");
 
         for (GroupInfo group : groups) {
-            printGroup(group, detailed, m.getSelfAddress());
+            printGroup(m, group, detailed);
         }
         return 0;
     }

src/main/java/org/asamk/signal/commands/ListIdentitiesCommand.java

@@ -15,14 +15,17 @@ public class ListIdentitiesCommand implements LocalCommand {
 
     private static void printIdentityFingerprint(Manager m, JsonIdentityKeyStore.Identity theirId) {
         String digits = Util.formatSafetyNumber(m.computeSafetyNumber(theirId.getAddress(), theirId.getIdentityKey()));
-        System.out.println(String.format("%s: %s Added: %s Fingerprint: %s Safety Number: %s", theirId.getAddress().getNumber().orNull(),
-                theirId.getTrustLevel(), theirId.getDateAdded(), Hex.toString(theirId.getFingerprint()), digits));
+        System.out.println(String.format("%s: %s Added: %s Fingerprint: %s Safety Number: %s",
+                theirId.getAddress().getNumber().orNull(),
+                theirId.getTrustLevel(),
+                theirId.getDateAdded(),
+                Hex.toString(theirId.getFingerprint()),
+                digits));
     }
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        subparser.addArgument("-n", "--number")
-                .help("Only show identity keys for the given phone number.");
+        subparser.addArgument("-n", "--number").help("Only show identity keys for the given phone number.");
     }
 
     @Override

src/main/java/org/asamk/signal/commands/QuitGroupCommand.java

@@ -3,29 +3,30 @@ package org.asamk.signal.commands;
 import net.sourceforge.argparse4j.inf.Namespace;
 import net.sourceforge.argparse4j.inf.Subparser;
 
+import org.asamk.signal.manager.GroupId;
+import org.asamk.signal.manager.GroupIdFormatException;
 import org.asamk.signal.manager.GroupNotFoundException;
 import org.asamk.signal.manager.Manager;
 import org.asamk.signal.manager.NotAGroupMemberException;
-import org.asamk.signal.util.GroupIdFormatException;
 import org.asamk.signal.util.Util;
-import org.whispersystems.signalservice.api.push.exceptions.EncapsulatedExceptions;
+import org.whispersystems.libsignal.util.Pair;
+import org.whispersystems.signalservice.api.messages.SendMessageResult;
 
 import java.io.IOException;
+import java.util.List;
 
 import static org.asamk.signal.util.ErrorUtils.handleAssertionError;
-import static org.asamk.signal.util.ErrorUtils.handleEncapsulatedExceptions;
 import static org.asamk.signal.util.ErrorUtils.handleGroupIdFormatException;
 import static org.asamk.signal.util.ErrorUtils.handleGroupNotFoundException;
 import static org.asamk.signal.util.ErrorUtils.handleIOException;
 import static org.asamk.signal.util.ErrorUtils.handleNotAGroupMemberException;
+import static org.asamk.signal.util.ErrorUtils.handleTimestampAndSendMessageResults;
 
 public class QuitGroupCommand implements LocalCommand {
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        subparser.addArgument("-g", "--group")
-                .required(true)
-                .help("Specify the recipient group ID.");
+        subparser.addArgument("-g", "--group").required(true).help("Specify the recipient group ID.");
     }
 
     @Override
@@ -36,14 +37,12 @@ public class QuitGroupCommand implements LocalCommand {
         }
 
         try {
-            m.sendQuitGroupMessage(Util.decodeGroupId(ns.getString("group")));
-            return 0;
+            final GroupId groupId = Util.decodeGroupId(ns.getString("group"));
+            final Pair<Long, List<SendMessageResult>> results = m.sendQuitGroupMessage(groupId);
+            return handleTimestampAndSendMessageResults(results.first(), results.second());
         } catch (IOException e) {
             handleIOException(e);
             return 3;
-        } catch (EncapsulatedExceptions e) {
-            handleEncapsulatedExceptions(e);
-            return 3;
         } catch (AssertionError e) {
             handleAssertionError(e);
             return 1;

src/main/java/org/asamk/signal/commands/ReceiveCommand.java

@@ -63,7 +63,9 @@ public class ReceiveCommand implements ExtendedDbusCommand, LocalCommand {
                     }
                 } else {
                     System.out.print(String.format("Envelope from: %s\nTimestamp: %s\nBody: %s\n",
-                            messageReceived.getSender(), DateUtils.formatTimestamp(messageReceived.getTimestamp()), messageReceived.getMessage()));
+                            messageReceived.getSender(),
+                            DateUtils.formatTimestamp(messageReceived.getTimestamp()),
+                            messageReceived.getMessage()));
                     if (messageReceived.getGroupId().length > 0) {
                         System.out.println("Group info:");
                         System.out.println("  Id: " + Base64.encodeBytes(messageReceived.getGroupId()));
@@ -78,23 +80,23 @@ public class ReceiveCommand implements ExtendedDbusCommand, LocalCommand {
                 }
             });
 
-            dbusconnection.addSigHandler(Signal.ReceiptReceived.class,
-                    receiptReceived -> {
-                        if (jsonProcessor != null) {
-                            JsonMessageEnvelope envelope = new JsonMessageEnvelope(receiptReceived);
-                            ObjectNode result = jsonProcessor.createObjectNode();
-                            result.putPOJO("envelope", envelope);
-                            try {
-                                jsonProcessor.writeValue(System.out, result);
-                                System.out.println();
-                            } catch (IOException e) {
-                                e.printStackTrace();
-                            }
-                        } else {
-                            System.out.print(String.format("Receipt from: %s\nTimestamp: %s\n",
-                                    receiptReceived.getSender(), DateUtils.formatTimestamp(receiptReceived.getTimestamp())));
-                        }
-                    });
+            dbusconnection.addSigHandler(Signal.ReceiptReceived.class, receiptReceived -> {
+                if (jsonProcessor != null) {
+                    JsonMessageEnvelope envelope = new JsonMessageEnvelope(receiptReceived);
+                    ObjectNode result = jsonProcessor.createObjectNode();
+                    result.putPOJO("envelope", envelope);
+                    try {
+                        jsonProcessor.writeValue(System.out, result);
+                        System.out.println();
+                    } catch (IOException e) {
+                        e.printStackTrace();
+                    }
+                } else {
+                    System.out.print(String.format("Receipt from: %s\nTimestamp: %s\n",
+                            receiptReceived.getSender(),
+                            DateUtils.formatTimestamp(receiptReceived.getTimestamp())));
+                }
+            });
 
             dbusconnection.addSigHandler(Signal.SyncMessageReceived.class, syncReceived -> {
                 if (jsonProcessor != null) {
@@ -109,7 +111,10 @@ public class ReceiveCommand implements ExtendedDbusCommand, LocalCommand {
                     }
                 } else {
                     System.out.print(String.format("Sync Envelope from: %s to: %s\nTimestamp: %s\nBody: %s\n",
-                            syncReceived.getSource(), syncReceived.getDestination(), DateUtils.formatTimestamp(syncReceived.getTimestamp()), syncReceived.getMessage()));
+                            syncReceived.getSource(),
+                            syncReceived.getDestination(),
+                            DateUtils.formatTimestamp(syncReceived.getTimestamp()),
+                            syncReceived.getMessage()));
                     if (syncReceived.getGroupId().length > 0) {
                         System.out.println("Group info:");
                         System.out.println("  Id: " + Base64.encodeBytes(syncReceived.getGroupId()));
@@ -156,8 +161,14 @@ public class ReceiveCommand implements ExtendedDbusCommand, LocalCommand {
         }
         boolean ignoreAttachments = ns.getBoolean("ignore_attachments");
         try {
-            final Manager.ReceiveMessageHandler handler = ns.getBoolean("json") ? new JsonReceiveMessageHandler(m) : new ReceiveMessageHandler(m);
-            m.receiveMessages((long) (timeout * 1000), TimeUnit.MILLISECONDS, returnOnTimeout, ignoreAttachments, handler);
+            final Manager.ReceiveMessageHandler handler = ns.getBoolean("json")
+                    ? new JsonReceiveMessageHandler(m)
+                    : new ReceiveMessageHandler(m);
+            m.receiveMessages((long) (timeout * 1000),
+                    TimeUnit.MILLISECONDS,
+                    returnOnTimeout,
+                    ignoreAttachments,
+                    handler);
             return 0;
         } catch (IOException e) {
             System.err.println("Error while receiving messages: " + e.getMessage());

src/main/java/org/asamk/signal/commands/RegisterCommand.java

@@ -16,15 +16,19 @@ public class RegisterCommand implements LocalCommand {
         subparser.addArgument("-v", "--voice")
                 .help("The verification should be done over voice, not sms.")
                 .action(Arguments.storeTrue());
+        subparser.addArgument("--captcha")
+                .help("The captcha token, required if registration failed with a captcha required error.");
     }
 
     @Override
     public int handleCommand(final Namespace ns, final Manager m) {
         try {
-            m.register(ns.getBoolean("voice"));
+            final boolean voiceVerification = ns.getBoolean("voice");
+            final String captcha = ns.getString("captcha");
+            m.register(voiceVerification, captcha);
             return 0;
         } catch (CaptchaRequiredException e) {
-            System.err.println("Captcha required for verification (" + e.getMessage() + ")");
+            System.err.println("Captcha invalid or required for verification (" + e.getMessage() + ")");
             return 1;
         } catch (IOException e) {
             System.err.println("Request verify error: " + e.getMessage());

src/main/java/org/asamk/signal/commands/SendCommand.java

@@ -5,7 +5,7 @@ import net.sourceforge.argparse4j.inf.Namespace;
 import net.sourceforge.argparse4j.inf.Subparser;
 
 import org.asamk.Signal;
-import org.asamk.signal.util.GroupIdFormatException;
+import org.asamk.signal.manager.GroupIdFormatException;
 import org.asamk.signal.util.IOUtils;
 import org.asamk.signal.util.Util;
 import org.freedesktop.dbus.exceptions.DBusExecutionException;
@@ -22,16 +22,10 @@ public class SendCommand implements DbusCommand {
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        subparser.addArgument("-g", "--group")
-                .help("Specify the recipient group ID.");
-        subparser.addArgument("recipient")
-                .help("Specify the recipients' phone number.")
-                .nargs("*");
-        subparser.addArgument("-m", "--message")
-                .help("Specify the message, if missing standard input is used.");
-        subparser.addArgument("-a", "--attachment")
-                .nargs("*")
-                .help("Add file as attachment");
+        subparser.addArgument("-g", "--group").help("Specify the recipient group ID.");
+        subparser.addArgument("recipient").help("Specify the recipients' phone number.").nargs("*");
+        subparser.addArgument("-m", "--message").help("Specify the message, if missing standard input is used.");
+        subparser.addArgument("-a", "--attachment").nargs("*").help("Add file as attachment");
         subparser.addArgument("-e", "--endsession")
                 .help("Clear session state and send end session message.")
                 .action(Arguments.storeTrue());
@@ -44,7 +38,9 @@ public class SendCommand implements DbusCommand {
             return 1;
         }
 
-        if ((ns.getList("recipient") == null || ns.getList("recipient").size() == 0) && (ns.getBoolean("endsession") || ns.getString("group") == null)) {
+        if ((ns.getList("recipient") == null || ns.getList("recipient").size() == 0) && (
+                ns.getBoolean("endsession") || ns.getString("group") == null
+        )) {
             System.err.println("No recipients given");
             System.err.println("Aborting sending.");
             return 1;
@@ -83,7 +79,7 @@ public class SendCommand implements DbusCommand {
             if (ns.getString("group") != null) {
                 byte[] groupId;
                 try {
-                    groupId = Util.decodeGroupId(ns.getString("group"));
+                    groupId = Util.decodeGroupId(ns.getString("group")).serialize();
                 } catch (GroupIdFormatException e) {
                     handleGroupIdFormatException(e);
                     return 1;

src/main/java/org/asamk/signal/commands/SendReactionCommand.java

@@ -4,34 +4,34 @@ import net.sourceforge.argparse4j.impl.Arguments;
 import net.sourceforge.argparse4j.inf.Namespace;
 import net.sourceforge.argparse4j.inf.Subparser;
 
+import org.asamk.signal.manager.GroupId;
+import org.asamk.signal.manager.GroupIdFormatException;
 import org.asamk.signal.manager.GroupNotFoundException;
 import org.asamk.signal.manager.Manager;
 import org.asamk.signal.manager.NotAGroupMemberException;
-import org.asamk.signal.util.GroupIdFormatException;
 import org.asamk.signal.util.Util;
-import org.whispersystems.signalservice.api.push.exceptions.EncapsulatedExceptions;
+import org.whispersystems.libsignal.util.Pair;
+import org.whispersystems.signalservice.api.messages.SendMessageResult;
 import org.whispersystems.signalservice.api.util.InvalidNumberException;
 
 import java.io.IOException;
+import java.util.List;
 
 import static org.asamk.signal.util.ErrorUtils.handleAssertionError;
-import static org.asamk.signal.util.ErrorUtils.handleEncapsulatedExceptions;
 import static org.asamk.signal.util.ErrorUtils.handleGroupIdFormatException;
 import static org.asamk.signal.util.ErrorUtils.handleGroupNotFoundException;
 import static org.asamk.signal.util.ErrorUtils.handleIOException;
 import static org.asamk.signal.util.ErrorUtils.handleInvalidNumberException;
 import static org.asamk.signal.util.ErrorUtils.handleNotAGroupMemberException;
+import static org.asamk.signal.util.ErrorUtils.handleTimestampAndSendMessageResults;
 
 public class SendReactionCommand implements LocalCommand {
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
         subparser.help("Send reaction to a previously received or sent message.");
-        subparser.addArgument("-g", "--group")
-                .help("Specify the recipient group ID.");
-        subparser.addArgument("recipient")
-                .help("Specify the recipients' phone number.")
-                .nargs("*");
+        subparser.addArgument("-g", "--group").help("Specify the recipient group ID.");
+        subparser.addArgument("recipient").help("Specify the recipients' phone number.").nargs("*");
         subparser.addArgument("-e", "--emoji")
                 .required(true)
                 .help("Specify the emoji, should be a single unicode grapheme cluster.");
@@ -42,9 +42,7 @@ public class SendReactionCommand implements LocalCommand {
                 .required(true)
                 .type(long.class)
                 .help("Specify the timestamp of the message to which to react.");
-        subparser.addArgument("-r", "--remove")
-                .help("Remove a reaction.")
-                .action(Arguments.storeTrue());
+        subparser.addArgument("-r", "--remove").help("Remove a reaction.").action(Arguments.storeTrue());
     }
 
     @Override
@@ -66,19 +64,21 @@ public class SendReactionCommand implements LocalCommand {
         long targetTimestamp = ns.getLong("target_timestamp");
 
         try {
+            final Pair<Long, List<SendMessageResult>> results;
             if (ns.getString("group") != null) {
-                byte[] groupId = Util.decodeGroupId(ns.getString("group"));
-                m.sendGroupMessageReaction(emoji, isRemove, targetAuthor, targetTimestamp, groupId);
+                GroupId groupId = Util.decodeGroupId(ns.getString("group"));
+                results = m.sendGroupMessageReaction(emoji, isRemove, targetAuthor, targetTimestamp, groupId);
             } else {
-                m.sendMessageReaction(emoji, isRemove, targetAuthor, targetTimestamp, ns.getList("recipient"));
+                results = m.sendMessageReaction(emoji,
+                        isRemove,
+                        targetAuthor,
+                        targetTimestamp,
+                        ns.getList("recipient"));
             }
-            return 0;
+            return handleTimestampAndSendMessageResults(results.first(), results.second());
         } catch (IOException e) {
             handleIOException(e);
             return 3;
-        } catch (EncapsulatedExceptions e) {
-            handleEncapsulatedExceptions(e);
-            return 3;
         } catch (AssertionError e) {
             handleAssertionError(e);
             return 1;

src/main/java/org/asamk/signal/commands/TrustCommand.java

@@ -16,9 +16,7 @@ public class TrustCommand implements LocalCommand {
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        subparser.addArgument("number")
-                .help("Specify the phone number, for which to set the trust.")
-                .required(true);
+        subparser.addArgument("number").help("Specify the phone number, for which to set the trust.").required(true);
         MutuallyExclusiveGroup mutTrust = subparser.addMutuallyExclusiveGroup();
         mutTrust.addArgument("-a", "--trust-all-known-keys")
                 .help("Trust all known keys of this user, only use this for testing.")
@@ -49,7 +47,8 @@ public class TrustCommand implements LocalCommand {
                     try {
                         fingerprintBytes = Hex.toByteArray(safetyNumber.toLowerCase(Locale.ROOT));
                     } catch (Exception e) {
-                        System.err.println("Failed to parse the fingerprint, make sure the fingerprint is a correctly encoded hex string without additional characters.");
+                        System.err.println(
+                                "Failed to parse the fingerprint, make sure the fingerprint is a correctly encoded hex string without additional characters.");
                         return 1;
                     }
                     boolean res;
@@ -60,7 +59,8 @@ public class TrustCommand implements LocalCommand {
                         return 1;
                     }
                     if (!res) {
-                        System.err.println("Failed to set the trust for the fingerprint of this number, make sure the number and the fingerprint are correct.");
+                        System.err.println(
+                                "Failed to set the trust for the fingerprint of this number, make sure the number and the fingerprint are correct.");
                         return 1;
                     }
                 } else if (safetyNumber.length() == 60) {
@@ -72,15 +72,18 @@ public class TrustCommand implements LocalCommand {
                         return 1;
                     }
                     if (!res) {
-                        System.err.println("Failed to set the trust for the safety number of this phone number, make sure the phone number and the safety number are correct.");
+                        System.err.println(
+                                "Failed to set the trust for the safety number of this phone number, make sure the phone number and the safety number are correct.");
                         return 1;
                     }
                 } else {
-                    System.err.println("Safety number has invalid format, either specify the old hex fingerprint or the new safety number");
+                    System.err.println(
+                            "Safety number has invalid format, either specify the old hex fingerprint or the new safety number");
                     return 1;
                 }
             } else {
-                System.err.println("You need to specify the fingerprint/safety number you have verified with -v SAFETY_NUMBER");
+                System.err.println(
+                        "You need to specify the fingerprint/safety number you have verified with -v SAFETY_NUMBER");
                 return 1;
             }
         }

src/main/java/org/asamk/signal/commands/UnblockCommand.java

@@ -3,9 +3,10 @@ package org.asamk.signal.commands;
 import net.sourceforge.argparse4j.inf.Namespace;
 import net.sourceforge.argparse4j.inf.Subparser;
 
+import org.asamk.signal.manager.GroupId;
+import org.asamk.signal.manager.GroupIdFormatException;
 import org.asamk.signal.manager.GroupNotFoundException;
 import org.asamk.signal.manager.Manager;
-import org.asamk.signal.util.GroupIdFormatException;
 import org.asamk.signal.util.Util;
 import org.whispersystems.signalservice.api.util.InvalidNumberException;
 
@@ -13,12 +14,8 @@ public class UnblockCommand implements LocalCommand {
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        subparser.addArgument("contact")
-                .help("Contact number")
-                .nargs("*");
-        subparser.addArgument("-g", "--group")
-                .help("Group ID")
-                .nargs("*");
+        subparser.addArgument("contact").help("Contact number").nargs("*");
+        subparser.addArgument("-g", "--group").help("Group ID").nargs("*");
         subparser.help("Unblock the given contacts or groups (messages will be received again)");
     }
 
@@ -40,7 +37,7 @@ public class UnblockCommand implements LocalCommand {
         if (ns.<String>getList("group") != null) {
             for (String groupIdString : ns.<String>getList("group")) {
                 try {
-                    byte[] groupId = Util.decodeGroupId(groupIdString);
+                    GroupId groupId = Util.decodeGroupId(groupIdString);
                     m.setGroupBlocked(groupId, false);
                 } catch (GroupIdFormatException | GroupNotFoundException e) {
                     System.err.println(e.getMessage());

src/main/java/org/asamk/signal/commands/UpdateContactCommand.java

@@ -12,11 +12,8 @@ public class UpdateContactCommand implements LocalCommand {
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        subparser.addArgument("number")
-                .help("Contact number");
-        subparser.addArgument("-n", "--name")
-                .required(true)
-                .help("New contact name");
+        subparser.addArgument("number").help("Contact number");
+        subparser.addArgument("-n", "--name").required(true).help("New contact name");
         subparser.addArgument("-e", "--expiration")
                 .required(false)
                 .type(int.class)

src/main/java/org/asamk/signal/commands/UpdateGroupCommand.java

@@ -4,7 +4,7 @@ import net.sourceforge.argparse4j.inf.Namespace;
 import net.sourceforge.argparse4j.inf.Subparser;
 
 import org.asamk.Signal;
-import org.asamk.signal.util.GroupIdFormatException;
+import org.asamk.signal.manager.GroupIdFormatException;
 import org.asamk.signal.util.Util;
 import org.freedesktop.dbus.exceptions.DBusExecutionException;
 import org.whispersystems.util.Base64;
@@ -19,15 +19,10 @@ public class UpdateGroupCommand implements DbusCommand {
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        subparser.addArgument("-g", "--group")
-                .help("Specify the recipient group ID.");
-        subparser.addArgument("-n", "--name")
-                .help("Specify the new group name.");
-        subparser.addArgument("-a", "--avatar")
-                .help("Specify a new group avatar image file");
-        subparser.addArgument("-m", "--member")
-                .nargs("*")
-                .help("Specify one or more members to add to the group");
+        subparser.addArgument("-g", "--group").help("Specify the recipient group ID.");
+        subparser.addArgument("-n", "--name").help("Specify the new group name.");
+        subparser.addArgument("-a", "--avatar").help("Specify a new group avatar image file");
+        subparser.addArgument("-m", "--member").nargs("*").help("Specify one or more members to add to the group");
     }
 
     @Override
@@ -40,7 +35,7 @@ public class UpdateGroupCommand implements DbusCommand {
         byte[] groupId = null;
         if (ns.getString("group") != null) {
             try {
-                groupId = Util.decodeGroupId(ns.getString("group"));
+                groupId = Util.decodeGroupId(ns.getString("group")).serialize();
             } catch (GroupIdFormatException e) {
                 handleGroupIdFormatException(e);
                 return 1;

src/main/java/org/asamk/signal/commands/UpdateProfileCommand.java

@@ -14,16 +14,11 @@ public class UpdateProfileCommand implements LocalCommand {
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        final MutuallyExclusiveGroup avatarOptions = subparser.addMutuallyExclusiveGroup()
-                .required(true);
-        avatarOptions.addArgument("--avatar")
-                .help("Path to new profile avatar");
-        avatarOptions.addArgument("--remove-avatar")
-                .action(Arguments.storeTrue());
+        final MutuallyExclusiveGroup avatarOptions = subparser.addMutuallyExclusiveGroup().required(true);
+        avatarOptions.addArgument("--avatar").help("Path to new profile avatar");
+        avatarOptions.addArgument("--remove-avatar").action(Arguments.storeTrue());
 
-        subparser.addArgument("--name")
-                .required(true)
-                .help("New profile name");
+        subparser.addArgument("--name").required(true).help("New profile name");
 
         subparser.help("Set a name and avatar image for the user profile");
     }

src/main/java/org/asamk/signal/commands/UploadStickerPackCommand.java

@@ -6,6 +6,7 @@ import net.sourceforge.argparse4j.inf.Subparser;
 import org.asamk.signal.manager.Manager;
 import org.asamk.signal.manager.StickerPackInvalidException;
 
+import java.io.File;
 import java.io.IOException;
 
 public class UploadStickerPackCommand implements LocalCommand {
@@ -19,7 +20,7 @@ public class UploadStickerPackCommand implements LocalCommand {
     @Override
     public int handleCommand(final Namespace ns, final Manager m) {
         try {
-            String path = ns.getString("path");
+            File path = new File(ns.getString("path"));
             String url = m.uploadStickerPack(path);
             System.out.println(url);
             return 0;

src/main/java/org/asamk/signal/commands/VerifyCommand.java

@@ -12,10 +12,8 @@ public class VerifyCommand implements LocalCommand {
 
     @Override
     public void attachToSubparser(final Subparser subparser) {
-        subparser.addArgument("verificationCode")
-                .help("The verification code you received via sms or voice call.");
-        subparser.addArgument("-p", "--pin")
-                .help("The registration lock PIN, that was set by the user (Optional)");
+        subparser.addArgument("verificationCode").help("The verification code you received via sms or voice call.");
+        subparser.addArgument("-p", "--pin").help("The registration lock PIN, that was set by the user (Optional)");
     }
 
     @Override
@@ -30,7 +28,8 @@ public class VerifyCommand implements LocalCommand {
             m.verifyAccount(verificationCode, pin);
             return 0;
         } catch (LockedException e) {
-            System.err.println("Verification failed! This number is locked with a pin. Hours remaining until reset: " + (e.getTimeRemaining() / 1000 / 60 / 60));
+            System.err.println("Verification failed! This number is locked with a pin. Hours remaining until reset: "
+                    + (e.getTimeRemaining() / 1000 / 60 / 60));
             System.err.println("Use '--pin PIN_CODE' to specify the registration lock PIN");
             return 3;
         } catch (IOException e) {

src/main/java/org/asamk/signal/dbus/DbusSignalImpl.java

@@ -2,21 +2,23 @@ package org.asamk.signal.dbus;
 
 import org.asamk.Signal;
 import org.asamk.signal.manager.AttachmentInvalidException;
+import org.asamk.signal.manager.GroupId;
 import org.asamk.signal.manager.GroupNotFoundException;
 import org.asamk.signal.manager.Manager;
 import org.asamk.signal.manager.NotAGroupMemberException;
 import org.asamk.signal.storage.groups.GroupInfo;
+import org.asamk.signal.util.ErrorUtils;
 import org.freedesktop.dbus.exceptions.DBusExecutionException;
-import org.whispersystems.signalservice.api.crypto.UntrustedIdentityException;
-import org.whispersystems.signalservice.api.push.exceptions.EncapsulatedExceptions;
-import org.whispersystems.signalservice.api.push.exceptions.NetworkFailureException;
-import org.whispersystems.signalservice.api.push.exceptions.UnregisteredUserException;
+import org.whispersystems.libsignal.util.Pair;
+import org.whispersystems.signalservice.api.messages.SendMessageResult;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 import org.whispersystems.signalservice.api.util.InvalidNumberException;
 
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.stream.Collectors;
 
 public class DbusSignalImpl implements Signal {
 
@@ -43,41 +45,30 @@ public class DbusSignalImpl implements Signal {
         return sendMessage(message, attachments, recipients);
     }
 
-    private static DBusExecutionException convertEncapsulatedExceptions(EncapsulatedExceptions e) {
-        if (e.getNetworkExceptions().size() + e.getUnregisteredUserExceptions().size() + e.getUntrustedIdentityExceptions().size() == 1) {
-            if (e.getNetworkExceptions().size() == 1) {
-                NetworkFailureException n = e.getNetworkExceptions().get(0);
-                return new Error.Failure("Network failure for \"" + n.getE164number() + "\": " + n.getMessage());
-            } else if (e.getUnregisteredUserExceptions().size() == 1) {
-                UnregisteredUserException n = e.getUnregisteredUserExceptions().get(0);
-                return new Error.UnregisteredUser("Unregistered user \"" + n.getE164Number() + "\": " + n.getMessage());
-            } else if (e.getUntrustedIdentityExceptions().size() == 1) {
-                UntrustedIdentityException n = e.getUntrustedIdentityExceptions().get(0);
-                return new Error.UntrustedIdentity("Untrusted Identity for \"" + n.getIdentifier() + "\": " + n.getMessage());
-            }
+    private static void checkSendMessageResults(
+            long timestamp, List<SendMessageResult> results
+    ) throws DBusExecutionException {
+        List<String> errors = ErrorUtils.getErrorMessagesFromSendMessageResults(results);
+        if (errors.size() == 0) {
+            return;
         }
 
         StringBuilder message = new StringBuilder();
-        message.append("Failed to send (some) messages:").append('\n');
-        for (NetworkFailureException n : e.getNetworkExceptions()) {
-            message.append("Network failure for \"").append(n.getE164number()).append("\": ").append(n.getMessage()).append('\n');
-        }
-        for (UnregisteredUserException n : e.getUnregisteredUserExceptions()) {
-            message.append("Unregistered user \"").append(n.getE164Number()).append("\": ").append(n.getMessage()).append('\n');
-        }
-        for (UntrustedIdentityException n : e.getUntrustedIdentityExceptions()) {
-            message.append("Untrusted Identity for \"").append(n.getIdentifier()).append("\": ").append(n.getMessage()).append('\n');
+        message.append(timestamp).append('\n');
+        message.append("Failed to send (some) messages:\n");
+        for (String error : errors) {
+            message.append(error).append('\n');
         }
 
-        return new Error.Failure(message.toString());
+        throw new Error.Failure(message.toString());
     }
 
     @Override
     public long sendMessage(final String message, final List<String> attachments, final List<String> recipients) {
         try {
-            return m.sendMessage(message, attachments, recipients);
-        } catch (EncapsulatedExceptions e) {
-            throw convertEncapsulatedExceptions(e);
+            final Pair<Long, List<SendMessageResult>> results = m.sendMessage(message, attachments, recipients);
+            checkSendMessageResults(results.first(), results.second());
+            return results.first();
         } catch (InvalidNumberException e) {
             throw new Error.InvalidNumber(e.getMessage());
         } catch (AttachmentInvalidException e) {
@@ -90,11 +81,10 @@ public class DbusSignalImpl implements Signal {
     @Override
     public void sendEndSessionMessage(final List<String> recipients) {
         try {
-            m.sendEndSessionMessage(recipients);
+            final Pair<Long, List<SendMessageResult>> results = m.sendEndSessionMessage(recipients);
+            checkSendMessageResults(results.first(), results.second());
         } catch (IOException e) {
             throw new Error.Failure(e.getMessage());
-        } catch (EncapsulatedExceptions e) {
-            throw convertEncapsulatedExceptions(e);
         } catch (InvalidNumberException e) {
             throw new Error.InvalidNumber(e.getMessage());
         }
@@ -103,11 +93,13 @@ public class DbusSignalImpl implements Signal {
     @Override
     public long sendGroupMessage(final String message, final List<String> attachments, final byte[] groupId) {
         try {
-            return m.sendGroupMessage(message, attachments, groupId);
+            Pair<Long, List<SendMessageResult>> results = m.sendGroupMessage(message,
+                    attachments,
+                    GroupId.unknownVersion(groupId));
+            checkSendMessageResults(results.first(), results.second());
+            return results.first();
         } catch (IOException e) {
             throw new Error.Failure(e.getMessage());
-        } catch (EncapsulatedExceptions e) {
-            throw convertEncapsulatedExceptions(e);
         } catch (GroupNotFoundException | NotAGroupMemberException e) {
             throw new Error.GroupNotFound(e.getMessage());
         } catch (AttachmentInvalidException e) {
@@ -145,7 +137,7 @@ public class DbusSignalImpl implements Signal {
     @Override
     public void setGroupBlocked(final byte[] groupId, final boolean blocked) {
         try {
-            m.setGroupBlocked(groupId, blocked);
+            m.setGroupBlocked(GroupId.unknownVersion(groupId), blocked);
         } catch (GroupNotFoundException e) {
             throw new Error.GroupNotFound(e.getMessage());
         }
@@ -156,39 +148,57 @@ public class DbusSignalImpl implements Signal {
         List<GroupInfo> groups = m.getGroups();
         List<byte[]> ids = new ArrayList<>(groups.size());
         for (GroupInfo group : groups) {
-            ids.add(group.groupId);
+            ids.add(group.getGroupId().serialize());
         }
         return ids;
     }
 
     @Override
     public String getGroupName(final byte[] groupId) {
-        GroupInfo group = m.getGroup(groupId);
+        GroupInfo group = m.getGroup(GroupId.unknownVersion(groupId));
         if (group == null) {
             return "";
         } else {
-            return group.name;
+            return group.getTitle();
         }
     }
 
     @Override
     public List<String> getGroupMembers(final byte[] groupId) {
-        GroupInfo group = m.getGroup(groupId);
+        GroupInfo group = m.getGroup(GroupId.unknownVersion(groupId));
         if (group == null) {
             return Collections.emptyList();
         } else {
-            return new ArrayList<>(group.getMembersE164());
+            return group.getMembers()
+                    .stream()
+                    .map(m::resolveSignalServiceAddress)
+                    .map(SignalServiceAddress::getLegacyIdentifier)
+                    .collect(Collectors.toList());
         }
     }
 
     @Override
-    public byte[] updateGroup(final byte[] groupId, final String name, final List<String> members, final String avatar) {
+    public byte[] updateGroup(byte[] groupId, String name, List<String> members, String avatar) {
         try {
-            return m.updateGroup(groupId, name, members, avatar);
+            if (groupId.length == 0) {
+                groupId = null;
+            }
+            if (name.isEmpty()) {
+                name = null;
+            }
+            if (members.isEmpty()) {
+                members = null;
+            }
+            if (avatar.isEmpty()) {
+                avatar = null;
+            }
+            final Pair<GroupId, List<SendMessageResult>> results = m.updateGroup(groupId == null
+                    ? null
+                    : GroupId.unknownVersion(groupId), name, members, avatar);
+            checkSendMessageResults(0, results.second());
+            return results.first().serialize();
         } catch (IOException e) {
             throw new Error.Failure(e.getMessage());
-        } catch (EncapsulatedExceptions e) {
-            throw convertEncapsulatedExceptions(e);
         } catch (GroupNotFoundException | NotAGroupMemberException e) {
             throw new Error.GroupNotFound(e.getMessage());
         } catch (InvalidNumberException e) {

src/main/java/org/asamk/signal/json/JsonDataMessage.java

@@ -1,19 +1,17 @@
 package org.asamk.signal.json;
 
 import org.asamk.Signal;
-import org.whispersystems.signalservice.api.messages.SignalServiceAttachment;
+import org.asamk.signal.manager.Manager;
 import org.whispersystems.signalservice.api.messages.SignalServiceDataMessage;
 import org.whispersystems.signalservice.api.messages.SignalServiceGroup;
-//import org.whispersystems.libsignal.util.guava.Optional;
+import org.whispersystems.signalservice.api.messages.SignalServiceGroupV2;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
 
 
-// i think this is what you have to do to get another dict in json
-// but i'm not sure
 class JsonReaction {
-    String emoji; // unicode??
+    String emoji; // unicode?
     String targetAuthor;
     long targetTimestamp;
     boolean isRemove;
@@ -32,50 +30,72 @@ class JsonDataMessage {
     long timestamp;
     String message;
     int expiresInSeconds;
+
+    JsonReaction reaction;
+    JsonQuote quote;
+    List<JsonMention> mentions;
     List<JsonAttachment> attachments;
     JsonGroupInfo groupInfo;
     JsonReaction reaction;
 	SignalServiceDataMessage.Quote quote;
 
-    JsonDataMessage(SignalServiceDataMessage dataMessage) {
+    JsonDataMessage(SignalServiceDataMessage dataMessage, Manager m) {
         this.timestamp = dataMessage.getTimestamp();
-        if (dataMessage.getGroupContext().isPresent() && dataMessage.getGroupContext().get().getGroupV1().isPresent()) {
-            SignalServiceGroup groupInfo = dataMessage.getGroupContext().get().getGroupV1().get();
-            this.groupInfo = new JsonGroupInfo(groupInfo);
+        if (dataMessage.getGroupContext().isPresent()) {
+            if (dataMessage.getGroupContext().get().getGroupV1().isPresent()) {
+                SignalServiceGroup groupInfo = dataMessage.getGroupContext().get().getGroupV1().get();
+                this.groupInfo = new JsonGroupInfo(groupInfo);
+            } else if (dataMessage.getGroupContext().get().getGroupV2().isPresent()) {
+                SignalServiceGroupV2 groupInfo = dataMessage.getGroupContext().get().getGroupV2().get();
+                this.groupInfo = new JsonGroupInfo(groupInfo);
+            }
         }
         if (dataMessage.getBody().isPresent()) {
             this.message = dataMessage.getBody().get();
         }
         this.expiresInSeconds = dataMessage.getExpiresInSeconds();
-        if (dataMessage.getAttachments().isPresent()) {
-            this.attachments = new ArrayList<>(dataMessage.getAttachments().get().size());
-            for (SignalServiceAttachment attachment : dataMessage.getAttachments().get()) {
-                this.attachments.add(new JsonAttachment(attachment));
-            }
+        if (dataMessage.getReaction().isPresent()) {
+            this.reaction = new JsonReaction(dataMessage.getReaction().get(), m);
+        }
+        if (dataMessage.getQuote().isPresent()) {
+            this.quote = new JsonQuote(dataMessage.getQuote().get(), m);
+        }
+        if (dataMessage.getMentions().isPresent()) {
+            this.mentions = dataMessage.getMentions()
+                    .get()
+                    .stream()
+                    .map(mention -> new JsonMention(mention, m))
+                    .collect(Collectors.toList());
         } else {
-            this.attachments = new ArrayList<>();
+            this.mentions = List.of();
+        }
+        if (dataMessage.getAttachments().isPresent()) {
+            this.attachments = dataMessage.getAttachments()
+                    .get()
+                    .stream()
+                    .map(JsonAttachment::new)
+                    .collect(Collectors.toList());
+        } else {
+            this.attachments = List.of();
         }
         if (dataMessage.getReaction().isPresent()) {
             final SignalServiceDataMessage.Reaction reaction = dataMessage.getReaction().get();
             this.reaction = new JsonReaction(reaction);
-/*            this.emoji = reaction.getEmoji();
-            // comment on this line from ReceiveMessageHandler: todo resolve
+/*          this.emoji = reaction.getEmoji();
             this.targetAuthor = reaction.getTargetAuthor().getLegacyIdentifier();
 			this.targetTimestamp = reaction.getTargetSentTimestamp();
 */        } /*else {
 			this.reaction = null;
-/*
             this.emoji = "";
             this.targetAuthor = "";
             this.targetTimestamp = 0;
 
-*/ //       }
-/*
+	}
 
         if (message.getQuote().isPresent()) {
             SignalServiceDataMessage.Quote quote = message.getQuote().get();
             System.out.println("Quote: (" + quote.getId() + ")");
-            // there doesn't seem to be any fucking way to find a message's id?
+            // there doesn't seem to be any way to find a message's id?
             System.out.println(" Author: " + quote.getAuthor().getLegacyIdentifier());
             System.out.println(" Text: " + quote.getText());
         }
@@ -84,27 +104,24 @@ class JsonDataMessage {
         }
 */
     }
-	// very confusingly MessageReceived seems to be only made in JsonDbusReceiveMessageHandler
-	// and only when *sending* to dbus, so to my current understanding this never gets called
-	// which would suggest i'm not understanding something
     public JsonDataMessage(Signal.MessageReceived messageReceived) {
         timestamp = messageReceived.getTimestamp();
         message = messageReceived.getMessage();
         groupInfo = new JsonGroupInfo(messageReceived.getGroupId());
-        attachments = messageReceived.getAttachments()
-                .stream()
-                .map(JsonAttachment::new)
-                .collect(Collectors.toList());
+        reaction = null;    // TODO Replace these 3 with the proper commands
+        quote = null;
+        mentions = null;
+        attachments = messageReceived.getAttachments().stream().map(JsonAttachment::new).collect(Collectors.toList());
     }
-	// i don't understand what SyncMessages are so i'm gonna ignore them
+	// i don't understand what SyncMessages are so i'm going to ignore them
 	// i think it only matters if you have multiple devices on your end
     public JsonDataMessage(Signal.SyncMessageReceived messageReceived) {
         timestamp = messageReceived.getTimestamp();
         message = messageReceived.getMessage();
         groupInfo = new JsonGroupInfo(messageReceived.getGroupId());
-        attachments = messageReceived.getAttachments()
-                .stream()
-                .map(JsonAttachment::new)
-                .collect(Collectors.toList());
+        reaction = null;    // TODO Replace these 3 with the proper commands
+        quote = null;
+        mentions = null;
+        attachments = messageReceived.getAttachments().stream().map(JsonAttachment::new).collect(Collectors.toList());
     }
 }

src/main/java/org/asamk/signal/json/JsonGroupInfo.java

@@ -1,6 +1,8 @@
 package org.asamk.signal.json;
 
+import org.asamk.signal.manager.GroupUtils;
 import org.whispersystems.signalservice.api.messages.SignalServiceGroup;
+import org.whispersystems.signalservice.api.messages.SignalServiceGroupV2;
 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 import org.whispersystems.util.Base64;
 
@@ -28,6 +30,11 @@ class JsonGroupInfo {
         this.type = groupInfo.getType().toString();
     }
 
+    JsonGroupInfo(SignalServiceGroupV2 groupInfo) {
+        this.groupId = GroupUtils.getGroupIdV2(groupInfo.getMasterKey()).toBase64();
+        this.type = groupInfo.hasSignedGroupChange() ? "UPDATE" : "DELIVER";
+    }
+
     JsonGroupInfo(byte[] groupId) {
         this.groupId = Base64.encodeBytes(groupId);
     }

src/main/java/org/asamk/signal/json/JsonMention.java

@@ -0,0 +1,19 @@
+package org.asamk.signal.json;
+
+import org.asamk.signal.manager.Manager;
+import org.whispersystems.signalservice.api.messages.SignalServiceDataMessage;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+
+public class JsonMention {
+
+    String name;
+    int start;
+    int length;
+
+    JsonMention(SignalServiceDataMessage.Mention mention, Manager m) {
+        this.name = m.resolveSignalServiceAddress(new SignalServiceAddress(mention.getUuid(), null))
+                .getLegacyIdentifier();
+        this.start = mention.getStart();
+        this.length = mention.getLength();
+    }
+}

src/main/java/org/asamk/signal/json/JsonMessageEnvelope.java

@@ -2,24 +2,25 @@ package org.asamk.signal.json;
 
 import org.asamk.Signal;
 //import org.whispersystems.signalservice.api.messages.SignalServiceTypingMessage;
+import org.asamk.signal.manager.Manager;
 import org.whispersystems.signalservice.api.messages.SignalServiceContent;
 import org.whispersystems.signalservice.api.messages.SignalServiceEnvelope;
 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 
+import java.util.List;
+
 public class JsonMessageEnvelope {
-	// gotta do something so that it actually emits valid json instead of null
-	// or just fix it on the python side i guess 
     String source;
     int sourceDevice;
     String relay;
     long timestamp;
-    boolean isReceipt;
     JsonDataMessage dataMessage;
     JsonSyncMessage syncMessage;
     JsonCallMessage callMessage;
     JsonReceiptMessage receiptMessage;
-	// String typingAction;
-    public JsonMessageEnvelope(SignalServiceEnvelope envelope, SignalServiceContent content) {
+    // String typingAction;
+
+    public JsonMessageEnvelope(SignalServiceEnvelope envelope, SignalServiceContent content, Manager m) {
         if (!envelope.isUnidentifiedSender() && envelope.hasSource()) {
             SignalServiceAddress source = envelope.getSourceAddress();
             this.source = source.getLegacyIdentifier();
@@ -27,17 +28,19 @@ public class JsonMessageEnvelope {
         }
         this.sourceDevice = envelope.getSourceDevice();
         this.timestamp = envelope.getTimestamp();
-        this.isReceipt = envelope.isReceipt();
+        if (envelope.isReceipt()) {
+            this.receiptMessage = JsonReceiptMessage.deliveryReceipt(timestamp, List.of(timestamp));
+        }
         if (content != null) {
             if (envelope.isUnidentifiedSender()) {
                 this.source = content.getSender().getLegacyIdentifier();
                 this.sourceDevice = content.getSenderDevice();
             }
             if (content.getDataMessage().isPresent()) {
-                this.dataMessage = new JsonDataMessage(content.getDataMessage().get());
+                this.dataMessage = new JsonDataMessage(content.getDataMessage().get(), m);
             }
             if (content.getSyncMessage().isPresent()) {
-                this.syncMessage = new JsonSyncMessage(content.getSyncMessage().get());
+                this.syncMessage = new JsonSyncMessage(content.getSyncMessage().get(), m);
             }
             if (content.getCallMessage().isPresent()) {
                 this.callMessage = new JsonCallMessage(content.getCallMessage().get());
@@ -61,7 +64,7 @@ public class JsonMessageEnvelope {
     public JsonMessageEnvelope(Signal.ReceiptReceived receiptReceived) {
         source = receiptReceived.getSender();
         timestamp = receiptReceived.getTimestamp();
-        isReceipt = true;
+        receiptMessage = JsonReceiptMessage.deliveryReceipt(timestamp, List.of(timestamp));
     }
 
     public JsonMessageEnvelope(Signal.SyncMessageReceived messageReceived) {

src/main/java/org/asamk/signal/json/JsonQuote.java

@@ -0,0 +1,40 @@
+package org.asamk.signal.json;
+
+import org.asamk.signal.manager.Manager;
+import org.whispersystems.signalservice.api.messages.SignalServiceDataMessage;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class JsonQuote {
+
+    long id;
+    String author;
+    String text;
+
+    List<JsonMention> mentions;
+    List<JsonQuotedAttachment> attachments;
+
+    JsonQuote(SignalServiceDataMessage.Quote quote, Manager m) {
+        this.id = quote.getId();
+        this.author = m.resolveSignalServiceAddress(quote.getAuthor()).getLegacyIdentifier();
+        this.text = quote.getText();
+
+        if (quote.getMentions() != null && quote.getMentions().size() > 0) {
+            this.mentions = quote.getMentions()
+                    .stream()
+                    .map(quotedMention -> new JsonMention(quotedMention, m))
+                    .collect(Collectors.toList());
+        }
+
+        if (quote.getAttachments().size() > 0) {
+            this.attachments = quote.getAttachments()
+                    .stream()
+                    .map(JsonQuotedAttachment::new)
+                    .collect(Collectors.toList());
+        } else {
+            this.attachments = new ArrayList<>();
+        }
+    }
+}

src/main/java/org/asamk/signal/json/JsonQuotedAttachment.java

@@ -0,0 +1,20 @@
+package org.asamk.signal.json;
+
+import org.whispersystems.signalservice.api.messages.SignalServiceDataMessage;
+
+public class JsonQuotedAttachment {
+
+    String contentType;
+    String filename;
+    JsonAttachment thumbnail;
+
+    JsonQuotedAttachment(SignalServiceDataMessage.Quote.QuotedAttachment quotedAttachment) {
+        contentType = quotedAttachment.getContentType();
+        filename = quotedAttachment.getFileName();
+        if (quotedAttachment.getThumbnail() != null) {
+            thumbnail = new JsonAttachment(quotedAttachment.getThumbnail());
+        } else {
+            thumbnail = null;
+        }
+    }
+}

src/main/java/org/asamk/signal/json/JsonReaction.java

@@ -0,0 +1,19 @@
+package org.asamk.signal.json;
+
+import org.asamk.signal.manager.Manager;
+import org.whispersystems.signalservice.api.messages.SignalServiceDataMessage.Reaction;
+
+public class JsonReaction {
+
+    String emoji;
+    String targetAuthor;
+    long targetSentTimestamp;
+    boolean isRemove;
+
+    JsonReaction(Reaction reaction, Manager m) {
+        this.emoji = reaction.getEmoji();
+        this.targetAuthor = m.resolveSignalServiceAddress(reaction.getTargetAuthor()).getLegacyIdentifier();
+        this.targetSentTimestamp = reaction.getTargetSentTimestamp();
+        this.isRemove = reaction.isRemove();
+    }
+}

src/main/java/org/asamk/signal/json/JsonReceiptMessage.java

@@ -22,4 +22,17 @@ class JsonReceiptMessage {
         }
         this.timestamps = receiptMessage.getTimestamps();
     }
+
+    private JsonReceiptMessage(
+            final long when, final boolean isDelivery, final boolean isRead, final List<Long> timestamps
+    ) {
+        this.when = when;
+        this.isDelivery = isDelivery;
+        this.isRead = isRead;
+        this.timestamps = timestamps;
+    }
+
+    static JsonReceiptMessage deliveryReceipt(final long when, final List<Long> timestamps) {
+        return new JsonReceiptMessage(when, true, false, timestamps);
+    }
 }

src/main/java/org/asamk/signal/json/JsonSyncDataMessage.java

@@ -1,14 +1,15 @@
 package org.asamk.signal.json;
 
 import org.asamk.Signal;
+import org.asamk.signal.manager.Manager;
 import org.whispersystems.signalservice.api.messages.multidevice.SentTranscriptMessage;
 
 class JsonSyncDataMessage extends JsonDataMessage {
 
     String destination;
 
-    JsonSyncDataMessage(SentTranscriptMessage transcriptMessage) {
-        super(transcriptMessage.getMessage());
+    JsonSyncDataMessage(SentTranscriptMessage transcriptMessage, Manager m) {
+        super(transcriptMessage.getMessage(), m);
         if (transcriptMessage.getDestination().isPresent()) {
             this.destination = transcriptMessage.getDestination().get().getLegacyIdentifier();
         }

src/main/java/org/asamk/signal/json/JsonSyncMessage.java

@@ -1,6 +1,7 @@
 package org.asamk.signal.json;
 
 import org.asamk.Signal;
+import org.asamk.signal.manager.Manager;
 import org.whispersystems.signalservice.api.messages.multidevice.ReadMessage;
 import org.whispersystems.signalservice.api.messages.multidevice.SignalServiceSyncMessage;
 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
@@ -21,9 +22,9 @@ class JsonSyncMessage {
     List<ReadMessage> readMessages;
     JsonSyncMessageType type;
 
-    JsonSyncMessage(SignalServiceSyncMessage syncMessage) {
+    JsonSyncMessage(SignalServiceSyncMessage syncMessage, Manager m) {
         if (syncMessage.getSent().isPresent()) {
-            this.sentMessage = new JsonSyncDataMessage(syncMessage.getSent().get());
+            this.sentMessage = new JsonSyncDataMessage(syncMessage.getSent().get(), m);
         }
         if (syncMessage.getBlockedList().isPresent()) {
             this.blockedNumbers = new ArrayList<>(syncMessage.getBlockedList().get().getAddresses().size());

src/main/java/org/asamk/signal/manager/GroupId.java

@@ -0,0 +1,63 @@
+package org.asamk.signal.manager;
+
+import org.whispersystems.util.Base64;
+
+import java.util.Arrays;
+
+public abstract class GroupId {
+
+    private final byte[] id;
+
+    public static GroupIdV1 v1(byte[] id) {
+        return new GroupIdV1(id);
+    }
+
+    public static GroupIdV2 v2(byte[] id) {
+        return new GroupIdV2(id);
+    }
+
+    public static GroupId unknownVersion(byte[] id) {
+        if (id.length == 16) {
+            return new GroupIdV1(id);
+        } else if (id.length == 32) {
+            return new GroupIdV2(id);
+        }
+
+        throw new AssertionError("Invalid group id of size " + id.length);
+    }
+
+    public static GroupId fromBase64(String id) throws GroupIdFormatException {
+        try {
+            return unknownVersion(java.util.Base64.getDecoder().decode(id));
+        } catch (Throwable e) {
+            throw new GroupIdFormatException(id, e);
+        }
+    }
+
+    public GroupId(final byte[] id) {
+        this.id = id;
+    }
+
+    public byte[] serialize() {
+        return id;
+    }
+
+    public String toBase64() {
+        return Base64.encodeBytes(id);
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        final GroupId groupId = (GroupId) o;
+
+        return Arrays.equals(id, groupId.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(id);
+    }
+}

src/main/java/org/asamk/signal/manager/GroupIdFormatException.java

@@ -0,0 +1,8 @@
+package org.asamk.signal.manager;
+
+public class GroupIdFormatException extends Exception {
+
+    public GroupIdFormatException(String groupId, Throwable e) {
+        super("Failed to decode groupId (must be base64) \"" + groupId + "\": " + e.getMessage(), e);
+    }
+}

src/main/java/org/asamk/signal/manager/GroupIdV1.java

@@ -0,0 +1,14 @@
+package org.asamk.signal.manager;
+
+import static org.asamk.signal.manager.KeyUtils.getSecretBytes;
+
+public class GroupIdV1 extends GroupId {
+
+    public static GroupIdV1 createRandom() {
+        return new GroupIdV1(getSecretBytes(16));
+    }
+
+    public GroupIdV1(final byte[] id) {
+        super(id);
+    }
+}

src/main/java/org/asamk/signal/manager/GroupIdV2.java

@@ -0,0 +1,14 @@
+package org.asamk.signal.manager;
+
+import java.util.Base64;
+
+public class GroupIdV2 extends GroupId {
+
+    public static GroupIdV2 fromBase64(String groupId) {
+        return new GroupIdV2(Base64.getDecoder().decode(groupId));
+    }
+
+    public GroupIdV2(final byte[] id) {
+        super(id);
+    }
+}

src/main/java/org/asamk/signal/manager/GroupInviteLinkUrl.java

@@ -0,0 +1,140 @@
+package org.asamk.signal.manager;
+
+import com.google.protobuf.ByteString;
+
+import org.signal.storageservice.protos.groups.GroupInviteLink;
+import org.signal.storageservice.protos.groups.local.DecryptedGroup;
+import org.signal.zkgroup.InvalidInputException;
+import org.signal.zkgroup.groups.GroupMasterKey;
+import org.whispersystems.util.Base64UrlSafe;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+
+public final class GroupInviteLinkUrl {
+
+    private static final String GROUP_URL_HOST = "signal.group";
+    private static final String GROUP_URL_PREFIX = "https://" + GROUP_URL_HOST + "/#";
+
+    private final GroupMasterKey groupMasterKey;
+    private final GroupLinkPassword password;
+    private final String url;
+
+    public static GroupInviteLinkUrl forGroup(GroupMasterKey groupMasterKey, DecryptedGroup group) {
+        return new GroupInviteLinkUrl(groupMasterKey,
+                GroupLinkPassword.fromBytes(group.getInviteLinkPassword().toByteArray()));
+    }
+
+    public static boolean isGroupLink(String urlString) {
+        return getGroupUrl(urlString) != null;
+    }
+
+    /**
+     * @return null iff not a group url.
+     * @throws InvalidGroupLinkException If group url, but cannot be parsed.
+     */
+    public static GroupInviteLinkUrl fromUri(String urlString) throws InvalidGroupLinkException, UnknownGroupLinkVersionException {
+        URI uri = getGroupUrl(urlString);
+
+        if (uri == null) {
+            return null;
+        }
+
+        try {
+            if (!"/".equals(uri.getPath()) && uri.getPath().length() > 0) {
+                throw new InvalidGroupLinkException("No path was expected in uri");
+            }
+
+            String encoding = uri.getFragment();
+
+            if (encoding == null || encoding.length() == 0) {
+                throw new InvalidGroupLinkException("No reference was in the uri");
+            }
+
+            byte[] bytes = Base64UrlSafe.decodePaddingAgnostic(encoding);
+            GroupInviteLink groupInviteLink = GroupInviteLink.parseFrom(bytes);
+
+            switch (groupInviteLink.getContentsCase()) {
+                case V1CONTENTS: {
+                    GroupInviteLink.GroupInviteLinkContentsV1 groupInviteLinkContentsV1 = groupInviteLink.getV1Contents();
+                    GroupMasterKey groupMasterKey = new GroupMasterKey(groupInviteLinkContentsV1.getGroupMasterKey()
+                            .toByteArray());
+                    GroupLinkPassword password = GroupLinkPassword.fromBytes(groupInviteLinkContentsV1.getInviteLinkPassword()
+                            .toByteArray());
+
+                    return new GroupInviteLinkUrl(groupMasterKey, password);
+                }
+                default:
+                    throw new UnknownGroupLinkVersionException("Url contains no known group link content");
+            }
+        } catch (InvalidInputException | IOException e) {
+            throw new InvalidGroupLinkException(e);
+        }
+    }
+
+    /**
+     * @return {@link URI} if the host name matches.
+     */
+    private static URI getGroupUrl(String urlString) {
+        try {
+            URI url = new URI(urlString);
+
+            if (!"https".equalsIgnoreCase(url.getScheme()) && !"sgnl".equalsIgnoreCase(url.getScheme())) {
+                return null;
+            }
+
+            return GROUP_URL_HOST.equalsIgnoreCase(url.getHost()) ? url : null;
+        } catch (URISyntaxException e) {
+            return null;
+        }
+    }
+
+    private GroupInviteLinkUrl(GroupMasterKey groupMasterKey, GroupLinkPassword password) {
+        this.groupMasterKey = groupMasterKey;
+        this.password = password;
+        this.url = createUrl(groupMasterKey, password);
+    }
+
+    protected static String createUrl(GroupMasterKey groupMasterKey, GroupLinkPassword password) {
+        GroupInviteLink groupInviteLink = GroupInviteLink.newBuilder()
+                .setV1Contents(GroupInviteLink.GroupInviteLinkContentsV1.newBuilder()
+                        .setGroupMasterKey(ByteString.copyFrom(groupMasterKey.serialize()))
+                        .setInviteLinkPassword(ByteString.copyFrom(password.serialize())))
+                .build();
+
+        String encoding = Base64UrlSafe.encodeBytesWithoutPadding(groupInviteLink.toByteArray());
+
+        return GROUP_URL_PREFIX + encoding;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public GroupMasterKey getGroupMasterKey() {
+        return groupMasterKey;
+    }
+
+    public GroupLinkPassword getPassword() {
+        return password;
+    }
+
+    public final static class InvalidGroupLinkException extends Exception {
+
+        public InvalidGroupLinkException(String message) {
+            super(message);
+        }
+
+        public InvalidGroupLinkException(Throwable cause) {
+            super(cause);
+        }
+    }
+
+    public final static class UnknownGroupLinkVersionException extends Exception {
+
+        public UnknownGroupLinkVersionException(String message) {
+            super(message);
+        }
+    }
+}

src/main/java/org/asamk/signal/manager/GroupLinkPassword.java

@@ -0,0 +1,40 @@
+package org.asamk.signal.manager;
+
+import java.util.Arrays;
+
+public final class GroupLinkPassword {
+
+    private static final int SIZE = 16;
+
+    private final byte[] bytes;
+
+    public static GroupLinkPassword createNew() {
+        return new GroupLinkPassword(KeyUtils.getSecretBytes(SIZE));
+    }
+
+    public static GroupLinkPassword fromBytes(byte[] bytes) {
+        return new GroupLinkPassword(bytes);
+    }
+
+    private GroupLinkPassword(byte[] bytes) {
+        this.bytes = bytes;
+    }
+
+    public byte[] serialize() {
+        return bytes.clone();
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (!(other instanceof GroupLinkPassword)) {
+            return false;
+        }
+
+        return Arrays.equals(bytes, ((GroupLinkPassword) other).bytes);
+    }
+
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(bytes);
+    }
+}

src/main/java/org/asamk/signal/manager/GroupNotFoundException.java

@@ -1,10 +1,8 @@
 package org.asamk.signal.manager;
 
-import org.whispersystems.util.Base64;
-
 public class GroupNotFoundException extends Exception {
 
-    public GroupNotFoundException(byte[] groupId) {
-        super("Group not found: " + Base64.encodeBytes(groupId));
+    public GroupNotFoundException(GroupId groupId) {
+        super("Group not found: " + groupId.toBase64());
     }
 }

src/main/java/org/asamk/signal/manager/GroupUtils.java

@@ -0,0 +1,68 @@
+package org.asamk.signal.manager;
+
+import org.asamk.signal.storage.groups.GroupInfo;
+import org.asamk.signal.storage.groups.GroupInfoV1;
+import org.asamk.signal.storage.groups.GroupInfoV2;
+import org.signal.zkgroup.InvalidInputException;
+import org.signal.zkgroup.groups.GroupMasterKey;
+import org.signal.zkgroup.groups.GroupSecretParams;
+import org.whispersystems.libsignal.kdf.HKDFv3;
+import org.whispersystems.signalservice.api.messages.SignalServiceDataMessage;
+import org.whispersystems.signalservice.api.messages.SignalServiceGroup;
+import org.whispersystems.signalservice.api.messages.SignalServiceGroupContext;
+import org.whispersystems.signalservice.api.messages.SignalServiceGroupV2;
+
+public class GroupUtils {
+
+    public static void setGroupContext(
+            final SignalServiceDataMessage.Builder messageBuilder, final GroupInfo groupInfo
+    ) {
+        if (groupInfo instanceof GroupInfoV1) {
+            SignalServiceGroup group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.DELIVER)
+                    .withId(groupInfo.getGroupId().serialize())
+                    .build();
+            messageBuilder.asGroupMessage(group);
+        } else {
+            final GroupInfoV2 groupInfoV2 = (GroupInfoV2) groupInfo;
+            SignalServiceGroupV2 group = SignalServiceGroupV2.newBuilder(groupInfoV2.getMasterKey())
+                    .withRevision(groupInfoV2.getGroup() == null ? 0 : groupInfoV2.getGroup().getRevision())
+                    .build();
+            messageBuilder.asGroupMessage(group);
+        }
+    }
+
+    public static GroupId getGroupId(SignalServiceGroupContext context) {
+        if (context.getGroupV1().isPresent()) {
+            return GroupId.v1(context.getGroupV1().get().getGroupId());
+        } else if (context.getGroupV2().isPresent()) {
+            return getGroupIdV2(context.getGroupV2().get().getMasterKey());
+        } else {
+            return null;
+        }
+    }
+
+    public static GroupIdV2 getGroupIdV2(GroupSecretParams groupSecretParams) {
+        return GroupId.v2(groupSecretParams.getPublicParams().getGroupIdentifier().serialize());
+    }
+
+    public static GroupIdV2 getGroupIdV2(GroupMasterKey groupMasterKey) {
+        final GroupSecretParams groupSecretParams = GroupSecretParams.deriveFromMasterKey(groupMasterKey);
+        return getGroupIdV2(groupSecretParams);
+    }
+
+    public static GroupIdV2 getGroupIdV2(GroupIdV1 groupIdV1) {
+        final GroupSecretParams groupSecretParams = GroupSecretParams.deriveFromMasterKey(deriveV2MigrationMasterKey(
+                groupIdV1));
+        return getGroupIdV2(groupSecretParams);
+    }
+
+    private static GroupMasterKey deriveV2MigrationMasterKey(GroupIdV1 groupIdV1) {
+        try {
+            return new GroupMasterKey(new HKDFv3().deriveSecrets(groupIdV1.serialize(),
+                    "GV2 Migration".getBytes(),
+                    GroupMasterKey.SIZE));
+        } catch (InvalidInputException e) {
+            throw new AssertionError(e);
+        }
+    }
+}

src/main/java/org/asamk/signal/manager/HandleAction.java

@@ -2,7 +2,6 @@ package org.asamk.signal.manager;
 
 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 
-import java.util.Arrays;
 import java.util.Objects;
 
 interface HandleAction {
@@ -30,8 +29,7 @@ class SendReceiptAction implements HandleAction {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
         final SendReceiptAction that = (SendReceiptAction) o;
-        return timestamp == that.timestamp &&
-                address.equals(that.address);
+        return timestamp == that.timestamp && address.equals(that.address);
     }
 
     @Override
@@ -94,9 +92,9 @@ class SendSyncBlockedListAction implements HandleAction {
 class SendGroupInfoRequestAction implements HandleAction {
 
     private final SignalServiceAddress address;
-    private final byte[] groupId;
+    private final GroupIdV1 groupId;
 
-    public SendGroupInfoRequestAction(final SignalServiceAddress address, final byte[] groupId) {
+    public SendGroupInfoRequestAction(final SignalServiceAddress address, final GroupIdV1 groupId) {
         this.address = address;
         this.groupId = groupId;
     }
@@ -110,15 +108,17 @@ class SendGroupInfoRequestAction implements HandleAction {
     public boolean equals(final Object o) {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
+
         final SendGroupInfoRequestAction that = (SendGroupInfoRequestAction) o;
-        return address.equals(that.address) &&
-                Arrays.equals(groupId, that.groupId);
+
+        if (!address.equals(that.address)) return false;
+        return groupId.equals(that.groupId);
     }
 
     @Override
     public int hashCode() {
-        int result = Objects.hash(address);
-        result = 31 * result + Arrays.hashCode(groupId);
+        int result = address.hashCode();
+        result = 31 * result + groupId.hashCode();
         return result;
     }
 }
@@ -126,9 +126,9 @@ class SendGroupInfoRequestAction implements HandleAction {
 class SendGroupUpdateAction implements HandleAction {
 
     private final SignalServiceAddress address;
-    private final byte[] groupId;
+    private final GroupIdV1 groupId;
 
-    public SendGroupUpdateAction(final SignalServiceAddress address, final byte[] groupId) {
+    public SendGroupUpdateAction(final SignalServiceAddress address, final GroupIdV1 groupId) {
         this.address = address;
         this.groupId = groupId;
     }
@@ -142,15 +142,17 @@ class SendGroupUpdateAction implements HandleAction {
     public boolean equals(final Object o) {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
+
         final SendGroupUpdateAction that = (SendGroupUpdateAction) o;
-        return address.equals(that.address) &&
-                Arrays.equals(groupId, that.groupId);
+
+        if (!address.equals(that.address)) return false;
+        return groupId.equals(that.groupId);
     }
 
     @Override
     public int hashCode() {
-        int result = Objects.hash(address);
-        result = 31 * result + Arrays.hashCode(groupId);
+        int result = address.hashCode();
+        result = 31 * result + groupId.hashCode();
         return result;
     }
 }

src/main/java/org/asamk/signal/manager/IasTrustStore.java

@@ -0,0 +1,18 @@
+package org.asamk.signal.manager;
+
+import org.whispersystems.signalservice.api.push.TrustStore;
+
+import java.io.InputStream;
+
+class IasTrustStore implements TrustStore {
+
+    @Override
+    public InputStream getKeyStoreInputStream() {
+        return IasTrustStore.class.getResourceAsStream("ias.store");
+    }
+
+    @Override
+    public String getKeyStorePassword() {
+        return "whisper";
+    }
+}

src/main/java/org/asamk/signal/manager/KeyUtils.java

@@ -26,14 +26,6 @@ class KeyUtils {
         return getSecret(18);
     }
 
-    static byte[] createGroupId() {
-        return getSecretBytes(16);
-    }
-
-    static byte[] createUnrestrictedUnidentifiedAccess() {
-        return getSecretBytes(16);
-    }
-
     static byte[] createStickerUploadKey() {
         return getSecretBytes(32);
     }
@@ -43,7 +35,7 @@ class KeyUtils {
         return Base64.encodeBytes(secret);
     }
 
-    private static byte[] getSecretBytes(int size) {
+    static byte[] getSecretBytes(int size) {
         byte[] secret = new byte[size];
         RandomUtils.getSecureRandom().nextBytes(secret);
         return secret;

src/main/java/org/asamk/signal/manager/NotAGroupMemberException.java

@@ -1,10 +1,8 @@
 package org.asamk.signal.manager;
 
-import org.whispersystems.util.Base64;
-
 public class NotAGroupMemberException extends Exception {
 
-    public NotAGroupMemberException(byte[] groupId, String groupName) {
-        super("User is not a member in group: " + groupName + " (" + Base64.encodeBytes(groupId) + ")");
+    public NotAGroupMemberException(GroupId groupId, String groupName) {
+        super("User is not a member in group: " + groupName + " (" + groupId.toBase64() + ")");
     }
 }

src/main/java/org/asamk/signal/manager/PathConfig.java

@@ -1,34 +1,34 @@
 package org.asamk.signal.manager;
 
+import java.io.File;
+
 public class PathConfig {
 
-    private final String dataPath;
-    private final String attachmentsPath;
-    private final String avatarsPath;
+    private final File dataPath;
+    private final File attachmentsPath;
+    private final File avatarsPath;
 
-    public static PathConfig createDefault(final String settingsPath) {
-        return new PathConfig(
-                settingsPath + "/data",
-                settingsPath + "/attachments",
-                settingsPath + "/avatars"
-        );
+    public static PathConfig createDefault(final File settingsPath) {
+        return new PathConfig(new File(settingsPath, "data"),
+                new File(settingsPath, "attachments"),
+                new File(settingsPath, "avatars"));
     }
 
-    private PathConfig(final String dataPath, final String attachmentsPath, final String avatarsPath) {
+    private PathConfig(final File dataPath, final File attachmentsPath, final File avatarsPath) {
         this.dataPath = dataPath;
         this.attachmentsPath = attachmentsPath;
         this.avatarsPath = avatarsPath;
     }
 
-    public String getDataPath() {
+    public File getDataPath() {
         return dataPath;
     }
 
-    public String getAttachmentsPath() {
+    public File getAttachmentsPath() {
         return attachmentsPath;
     }
 
-    public String getAvatarsPath() {
+    public File getAvatarsPath() {
         return avatarsPath;
     }
 }

src/main/java/org/asamk/signal/manager/ProvisioningManager.java

@@ -31,6 +31,7 @@ import org.whispersystems.signalservice.api.util.UptimeSleepTimer;
 import org.whispersystems.signalservice.internal.configuration.SignalServiceConfiguration;
 import org.whispersystems.signalservice.internal.util.DynamicCredentialsProvider;
 
+import java.io.File;
 import java.io.IOException;
 import java.util.concurrent.TimeoutException;
 
@@ -45,7 +46,7 @@ public class ProvisioningManager {
     private final int registrationId;
     private final String password;
 
-    public ProvisioningManager(String settingsPath, SignalServiceConfiguration serviceConfiguration, String userAgent) {
+    public ProvisioningManager(File settingsPath, SignalServiceConfiguration serviceConfiguration, String userAgent) {
         this.pathConfig = PathConfig.createDefault(settingsPath);
         this.serviceConfiguration = serviceConfiguration;
         this.userAgent = userAgent;
@@ -70,12 +71,19 @@ public class ProvisioningManager {
     public String getDeviceLinkUri() throws TimeoutException, IOException {
         String deviceUuid = accountManager.getNewDeviceUuid();
 
-        return Utils.createDeviceLinkUri(new Utils.DeviceLinkInfo(deviceUuid, identityKey.getPublicKey().getPublicKey()));
+        return Utils.createDeviceLinkUri(new Utils.DeviceLinkInfo(deviceUuid,
+                identityKey.getPublicKey().getPublicKey()));
     }
 
     public String finishDeviceLink(String deviceName) throws IOException, InvalidKeyException, TimeoutException, UserAlreadyExists {
         String signalingKey = KeyUtils.createSignalingKey();
-        SignalServiceAccountManager.NewDeviceRegistrationReturn ret = accountManager.finishNewDeviceRegistration(identityKey, signalingKey, false, true, registrationId, deviceName);
+        SignalServiceAccountManager.NewDeviceRegistrationReturn ret = accountManager.finishNewDeviceRegistration(
+                identityKey,
+                signalingKey,
+                false,
+                true,
+                registrationId,
+                deviceName);
 
         String username = ret.getNumber();
         // TODO do this check before actually registering
@@ -96,7 +104,15 @@ public class ProvisioningManager {
             }
         }
 
-        try (SignalAccount account = SignalAccount.createLinkedAccount(pathConfig.getDataPath(), username, ret.getUuid(), password, ret.getDeviceId(), ret.getIdentity(), registrationId, signalingKey, profileKey)) {
+        try (SignalAccount account = SignalAccount.createLinkedAccount(pathConfig.getDataPath(),
+                username,
+                ret.getUuid(),
+                password,
+                ret.getDeviceId(),
+                ret.getIdentity(),
+                registrationId,
+                signalingKey,
+                profileKey)) {
             account.save();
 
             try (Manager m = new Manager(account, pathConfig, serviceConfiguration, userAgent)) {

src/main/java/org/asamk/signal/manager/ServiceConfig.java

@@ -1,7 +1,8 @@
 package org.asamk.signal.manager;
 
+import org.signal.zkgroup.ServerPublicParams;
 import org.whispersystems.libsignal.util.guava.Optional;
-import org.whispersystems.signalservice.api.profiles.SignalServiceProfile;
+import org.whispersystems.signalservice.api.account.AccountAttributes;
 import org.whispersystems.signalservice.api.push.TrustStore;
 import org.whispersystems.signalservice.internal.configuration.SignalCdnUrl;
 import org.whispersystems.signalservice.internal.configuration.SignalContactDiscoveryUrl;
@@ -12,8 +13,11 @@ import org.whispersystems.signalservice.internal.configuration.SignalStorageUrl;
 import org.whispersystems.util.Base64;
 
 import java.io.IOException;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.cert.CertificateException;
 import java.util.Collections;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -26,53 +30,86 @@ public class ServiceConfig {
     final static int PREKEY_MINIMUM_COUNT = 20;
     final static int PREKEY_BATCH_SIZE = 100;
     final static int MAX_ATTACHMENT_SIZE = 150 * 1024 * 1024;
+    final static int MAX_ENVELOPE_SIZE = 0;
     final static long AVATAR_DOWNLOAD_FAILSAFE_MAX_SIZE = 10 * 1024 * 1024;
 
+    final static String CDS_MRENCLAVE = "c98e00a4e3ff977a56afefe7362a27e4961e4f19e211febfbb19b897e6b80b15";
+
     private final static String URL = "https://textsecure-service.whispersystems.org";
     private final static String CDN_URL = "https://cdn.signal.org";
     private final static String CDN2_URL = "https://cdn2.signal.org";
+    private final static String SIGNAL_CONTACT_DISCOVERY_URL = "https://api.directory.signal.org";
     private final static String SIGNAL_KEY_BACKUP_URL = "https://api.backup.signal.org";
     private final static String STORAGE_URL = "https://storage.signal.org";
     private final static TrustStore TRUST_STORE = new WhisperTrustStore();
+    private final static TrustStore IAS_TRUST_STORE = new IasTrustStore();
 
     private final static Optional<Dns> dns = Optional.absent();
 
     private final static String zkGroupServerPublicParamsHex = "AMhf5ywVwITZMsff/eCyudZx9JDmkkkbV6PInzG4p8x3VqVJSFiMvnvlEKWuRob/1eaIetR31IYeAbm0NdOuHH8Qi+Rexi1wLlpzIo1gstHWBfZzy1+qHRV5A4TqPp15YzBPm0WSggW6PbSn+F4lf57VCnHF7p8SvzAA2ZZJPYJURt8X7bbg+H3i+PEjH9DXItNEqs2sNcug37xZQDLm7X0=";
+    private final static byte[] zkGroupServerPublicParams;
 
-    static final SignalServiceProfile.Capabilities capabilities = new SignalServiceProfile.Capabilities(false, false, false);
+    static final AccountAttributes.Capabilities capabilities;
 
-    public static SignalServiceConfiguration createDefaultServiceConfiguration(String userAgent) {
-        final Interceptor userAgentInterceptor = chain ->
-                chain.proceed(chain.request().newBuilder()
-                        .header("User-Agent", userAgent)
-                        .build());
-
-        final List<Interceptor> interceptors = Collections.singletonList(userAgentInterceptor);
-
-        final byte[] zkGroupServerPublicParams;
+    static {
         try {
             zkGroupServerPublicParams = Base64.decode(zkGroupServerPublicParamsHex);
         } catch (IOException e) {
             throw new AssertionError(e);
         }
 
-        return new SignalServiceConfiguration(
-                new SignalServiceUrl[]{new SignalServiceUrl(URL, TRUST_STORE)},
-                makeSignalCdnUrlMapFor(new SignalCdnUrl[]{new SignalCdnUrl(CDN_URL, TRUST_STORE)}, new SignalCdnUrl[]{new SignalCdnUrl(CDN2_URL, TRUST_STORE)}),
-                new SignalContactDiscoveryUrl[0],
+        boolean zkGroupAvailable;
+        try {
+            new ServerPublicParams(zkGroupServerPublicParams);
+            zkGroupAvailable = true;
+        } catch (Throwable ignored) {
+            zkGroupAvailable = false;
+        }
+        capabilities = new AccountAttributes.Capabilities(false, zkGroupAvailable, false, zkGroupAvailable);
+    }
+
+    public static SignalServiceConfiguration createDefaultServiceConfiguration(String userAgent) {
+        final Interceptor userAgentInterceptor = chain -> chain.proceed(chain.request()
+                .newBuilder()
+                .header("User-Agent", userAgent)
+                .build());
+
+        final List<Interceptor> interceptors = Collections.singletonList(userAgentInterceptor);
+
+        return new SignalServiceConfiguration(new SignalServiceUrl[]{new SignalServiceUrl(URL, TRUST_STORE)},
+                makeSignalCdnUrlMapFor(new SignalCdnUrl[]{new SignalCdnUrl(CDN_URL, TRUST_STORE)},
+                        new SignalCdnUrl[]{new SignalCdnUrl(CDN2_URL, TRUST_STORE)}),
+                new SignalContactDiscoveryUrl[]{new SignalContactDiscoveryUrl(SIGNAL_CONTACT_DISCOVERY_URL,
+                        TRUST_STORE)},
                 new SignalKeyBackupServiceUrl[]{new SignalKeyBackupServiceUrl(SIGNAL_KEY_BACKUP_URL, TRUST_STORE)},
                 new SignalStorageUrl[]{new SignalStorageUrl(STORAGE_URL, TRUST_STORE)},
                 interceptors,
                 dns,
-                zkGroupServerPublicParams
-        );
+                zkGroupServerPublicParams);
     }
 
-    private static Map<Integer, SignalCdnUrl[]> makeSignalCdnUrlMapFor(SignalCdnUrl[] cdn0Urls, SignalCdnUrl[] cdn2Urls) {
-        Map<Integer, SignalCdnUrl[]> result = new HashMap<>();
-        result.put(0, cdn0Urls);
-        result.put(2, cdn2Urls);
-        return Collections.unmodifiableMap(result);
+    public static AccountAttributes.Capabilities getCapabilities() {
+        return capabilities;
+    }
+
+    static KeyStore getIasKeyStore() {
+        try {
+            TrustStore contactTrustStore = IAS_TRUST_STORE;
+
+            KeyStore keyStore = KeyStore.getInstance("BKS");
+            keyStore.load(contactTrustStore.getKeyStoreInputStream(),
+                    contactTrustStore.getKeyStorePassword().toCharArray());
+
+            return keyStore;
+        } catch (KeyStoreException | CertificateException | IOException | NoSuchAlgorithmException e) {
+            throw new AssertionError(e);
+        }
+    }
+
+    private static Map<Integer, SignalCdnUrl[]> makeSignalCdnUrlMapFor(
+            SignalCdnUrl[] cdn0Urls, SignalCdnUrl[] cdn2Urls
+    ) {
+        return Map.of(0, cdn0Urls, 2, cdn2Urls);
     }
 
     private ServiceConfig() {

src/main/java/org/asamk/signal/manager/UserAlreadyExists.java

@@ -1,11 +1,13 @@
 package org.asamk.signal.manager;
 
+import java.io.File;
+
 public class UserAlreadyExists extends Exception {
 
     private final String username;
-    private final String fileName;
+    private final File fileName;
 
-    public UserAlreadyExists(String username, String fileName) {
+    public UserAlreadyExists(String username, File fileName) {
         this.username = username;
         this.fileName = fileName;
     }
@@ -14,7 +16,7 @@ public class UserAlreadyExists extends Exception {
         return username;
     }
 
-    public String getFileName() {
+    public File getFileName() {
         return fileName;
     }
 }

src/main/java/org/asamk/signal/manager/Utils.java

@@ -27,11 +27,11 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.io.UnsupportedEncodingException;
 import java.net.URI;
 import java.net.URLConnection;
 import java.net.URLDecoder;
 import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -81,7 +81,21 @@ class Utils {
         Optional<String> caption = Optional.absent();
         Optional<String> blurHash = Optional.absent();
         final Optional<ResumableUploadSpec> resumableUploadSpec = Optional.absent();
-        return new SignalServiceAttachmentStream(attachmentStream, mime, attachmentSize, Optional.of(attachmentFile.getName()), false, false, preview, 0, 0, uploadTimestamp, caption, blurHash, null, null, resumableUploadSpec);
+        return new SignalServiceAttachmentStream(attachmentStream,
+                mime,
+                attachmentSize,
+                Optional.of(attachmentFile.getName()),
+                false,
+                false,
+                preview,
+                0,
+                0,
+                uploadTimestamp,
+                caption,
+                blurHash,
+                null,
+                null,
+                resumableUploadSpec);
     }
 
     static StreamDetails createStreamDetailsFromFile(File file) throws IOException {
@@ -96,7 +110,8 @@ class Utils {
 
     static CertificateValidator getCertificateValidator() {
         try {
-            ECPublicKey unidentifiedSenderTrustRoot = Curve.decodePoint(Base64.decode(ServiceConfig.UNIDENTIFIED_SENDER_TRUST_ROOT), 0);
+            ECPublicKey unidentifiedSenderTrustRoot = Curve.decodePoint(Base64.decode(ServiceConfig.UNIDENTIFIED_SENDER_TRUST_ROOT),
+                    0);
             return new CertificateValidator(unidentifiedSenderTrustRoot);
         } catch (InvalidKeyException | IOException e) {
             throw new AssertionError(e);
@@ -107,31 +122,20 @@ class Utils {
         String[] params = query.split("&");
         Map<String, String> map = new HashMap<>();
         for (String param : params) {
-            String name = null;
             final String[] paramParts = param.split("=");
-            try {
-                name = URLDecoder.decode(paramParts[0], "utf-8");
-            } catch (UnsupportedEncodingException e) {
-                // Impossible
-            }
-            String value = null;
-            try {
-                value = URLDecoder.decode(paramParts[1], "utf-8");
-            } catch (UnsupportedEncodingException e) {
-                // Impossible
-            }
+            String name = URLDecoder.decode(paramParts[0], StandardCharsets.UTF_8);
+            String value = URLDecoder.decode(paramParts[1], StandardCharsets.UTF_8);
             map.put(name, value);
         }
         return map;
     }
 
     static String createDeviceLinkUri(DeviceLinkInfo info) {
-        try {
-            return "tsdevice:/?uuid=" + URLEncoder.encode(info.deviceIdentifier, "utf-8") + "&pub_key=" + URLEncoder.encode(Base64.encodeBytesWithoutPadding(info.deviceKey.serialize()), "utf-8");
-        } catch (UnsupportedEncodingException e) {
-            // Shouldn't happen
-            return null;
-        }
+        return "tsdevice:/?uuid="
+                + URLEncoder.encode(info.deviceIdentifier, StandardCharsets.UTF_8)
+                + "&pub_key="
+                + URLEncoder.encode(Base64.encodeBytesWithoutPadding(info.deviceKey.serialize()),
+                StandardCharsets.UTF_8);
     }
 
     static DeviceLinkInfo parseDeviceLinkUri(URI linkUri) throws IOException, InvalidKeyException {
@@ -195,7 +199,15 @@ class Utils {
             Optional<SignalServiceAddress> addressOptional = sourceUuid == null && source.isEmpty()
                     ? Optional.absent()
                     : Optional.of(new SignalServiceAddress(sourceUuid, source));
-            return new SignalServiceEnvelope(type, addressOptional, sourceDevice, timestamp, legacyMessage, content, serverReceivedTimestamp, serverDeliveredTimestamp, uuid);
+            return new SignalServiceEnvelope(type,
+                    addressOptional,
+                    sourceDevice,
+                    timestamp,
+                    legacyMessage,
+                    content,
+                    serverReceivedTimestamp,
+                    serverDeliveredTimestamp,
+                    uuid);
         }
     }
 
@@ -245,13 +257,18 @@ class Utils {
         return outputFile;
     }
 
-    static String computeSafetyNumber(SignalServiceAddress ownAddress, IdentityKey ownIdentityKey, SignalServiceAddress theirAddress, IdentityKey theirIdentityKey) {
+    static String computeSafetyNumber(
+            SignalServiceAddress ownAddress,
+            IdentityKey ownIdentityKey,
+            SignalServiceAddress theirAddress,
+            IdentityKey theirIdentityKey
+    ) {
         int version;
         byte[] ownId;
         byte[] theirId;
 
-        if (ServiceConfig.capabilities.isUuid()
-                && ownAddress.getUuid().isPresent() && theirAddress.getUuid().isPresent()) {
+        if (ServiceConfig.capabilities.isUuid() && ownAddress.getUuid().isPresent() && theirAddress.getUuid()
+                .isPresent()) {
             // Version 2: UUID user
             version = 2;
             ownId = UuidUtil.toByteArray(ownAddress.getUuid().get());
@@ -266,7 +283,11 @@ class Utils {
             theirId = theirAddress.getNumber().get().getBytes();
         }
 
-        Fingerprint fingerprint = new NumericFingerprintGenerator(5200).createFor(version, ownId, ownIdentityKey, theirId, theirIdentityKey);
+        Fingerprint fingerprint = new NumericFingerprintGenerator(5200).createFor(version,
+                ownId,
+                ownIdentityKey,
+                theirId,
+                theirIdentityKey);
         return fingerprint.getDisplayableFingerprint().getDisplayText();
     }
 

src/main/java/org/asamk/signal/manager/helper/GroupAuthorizationProvider.java

@@ -0,0 +1,11 @@
+package org.asamk.signal.manager.helper;
+
+import org.signal.zkgroup.groups.GroupSecretParams;
+import org.whispersystems.signalservice.api.groupsv2.GroupsV2AuthorizationString;
+
+import java.io.IOException;
+
+public interface GroupAuthorizationProvider {
+
+    GroupsV2AuthorizationString getAuthorizationForToday(GroupSecretParams groupSecretParams) throws IOException;
+}

src/main/java/org/asamk/signal/manager/helper/GroupHelper.java

@@ -0,0 +1,398 @@
+package org.asamk.signal.manager.helper;
+
+import com.google.protobuf.InvalidProtocolBufferException;
+
+import org.asamk.signal.manager.GroupIdV2;
+import org.asamk.signal.manager.GroupLinkPassword;
+import org.asamk.signal.manager.GroupUtils;
+import org.asamk.signal.storage.groups.GroupInfoV2;
+import org.asamk.signal.storage.profiles.SignalProfile;
+import org.asamk.signal.util.IOUtils;
+import org.signal.storageservice.protos.groups.AccessControl;
+import org.signal.storageservice.protos.groups.GroupChange;
+import org.signal.storageservice.protos.groups.Member;
+import org.signal.storageservice.protos.groups.local.DecryptedGroup;
+import org.signal.storageservice.protos.groups.local.DecryptedGroupChange;
+import org.signal.storageservice.protos.groups.local.DecryptedGroupJoinInfo;
+import org.signal.storageservice.protos.groups.local.DecryptedPendingMember;
+import org.signal.zkgroup.InvalidInputException;
+import org.signal.zkgroup.VerificationFailedException;
+import org.signal.zkgroup.groups.GroupMasterKey;
+import org.signal.zkgroup.groups.GroupSecretParams;
+import org.signal.zkgroup.groups.UuidCiphertext;
+import org.signal.zkgroup.profiles.ProfileKeyCredential;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.whispersystems.libsignal.util.Pair;
+import org.whispersystems.libsignal.util.guava.Optional;
+import org.whispersystems.signalservice.api.groupsv2.DecryptedGroupUtil;
+import org.whispersystems.signalservice.api.groupsv2.GroupCandidate;
+import org.whispersystems.signalservice.api.groupsv2.GroupLinkNotActiveException;
+import org.whispersystems.signalservice.api.groupsv2.GroupsV2Api;
+import org.whispersystems.signalservice.api.groupsv2.GroupsV2AuthorizationString;
+import org.whispersystems.signalservice.api.groupsv2.GroupsV2Operations;
+import org.whispersystems.signalservice.api.groupsv2.InvalidGroupStateException;
+import org.whispersystems.signalservice.api.groupsv2.NotAbleToApplyGroupV2ChangeException;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+import org.whispersystems.signalservice.api.util.UuidUtil;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+public class GroupHelper {
+
+    final static Logger logger = LoggerFactory.getLogger(GroupHelper.class);
+
+    private final ProfileKeyCredentialProvider profileKeyCredentialProvider;
+
+    private final ProfileProvider profileProvider;
+
+    private final SelfAddressProvider selfAddressProvider;
+
+    private final GroupsV2Operations groupsV2Operations;
+
+    private final GroupsV2Api groupsV2Api;
+
+    private final GroupAuthorizationProvider groupAuthorizationProvider;
+
+    public GroupHelper(
+            final ProfileKeyCredentialProvider profileKeyCredentialProvider,
+            final ProfileProvider profileProvider,
+            final SelfAddressProvider selfAddressProvider,
+            final GroupsV2Operations groupsV2Operations,
+            final GroupsV2Api groupsV2Api,
+            final GroupAuthorizationProvider groupAuthorizationProvider
+    ) {
+        this.profileKeyCredentialProvider = profileKeyCredentialProvider;
+        this.profileProvider = profileProvider;
+        this.selfAddressProvider = selfAddressProvider;
+        this.groupsV2Operations = groupsV2Operations;
+        this.groupsV2Api = groupsV2Api;
+        this.groupAuthorizationProvider = groupAuthorizationProvider;
+    }
+
+    public DecryptedGroup getDecryptedGroup(final GroupSecretParams groupSecretParams) {
+        try {
+            final GroupsV2AuthorizationString groupsV2AuthorizationString = groupAuthorizationProvider.getAuthorizationForToday(
+                    groupSecretParams);
+            return groupsV2Api.getGroup(groupSecretParams, groupsV2AuthorizationString);
+        } catch (IOException | VerificationFailedException | InvalidGroupStateException e) {
+            logger.warn("Failed to retrieve Group V2 info, ignoring: {}", e.getMessage());
+            return null;
+        }
+    }
+
+    public DecryptedGroupJoinInfo getDecryptedGroupJoinInfo(
+            GroupMasterKey groupMasterKey, GroupLinkPassword password
+    ) throws IOException, GroupLinkNotActiveException {
+        GroupSecretParams groupSecretParams = GroupSecretParams.deriveFromMasterKey(groupMasterKey);
+
+        return groupsV2Api.getGroupJoinInfo(groupSecretParams,
+                Optional.fromNullable(password).transform(GroupLinkPassword::serialize),
+                groupAuthorizationProvider.getAuthorizationForToday(groupSecretParams));
+    }
+
+    public GroupInfoV2 createGroupV2(
+            String name, Collection<SignalServiceAddress> members, String avatarFile
+    ) throws IOException {
+        final byte[] avatarBytes = readAvatarBytes(avatarFile);
+        final GroupsV2Operations.NewGroup newGroup = buildNewGroupV2(name, members, avatarBytes);
+        if (newGroup == null) {
+            return null;
+        }
+
+        final GroupSecretParams groupSecretParams = newGroup.getGroupSecretParams();
+
+        final GroupsV2AuthorizationString groupAuthForToday;
+        final DecryptedGroup decryptedGroup;
+        try {
+            groupAuthForToday = groupAuthorizationProvider.getAuthorizationForToday(groupSecretParams);
+            groupsV2Api.putNewGroup(newGroup, groupAuthForToday);
+            decryptedGroup = groupsV2Api.getGroup(groupSecretParams, groupAuthForToday);
+        } catch (IOException | VerificationFailedException | InvalidGroupStateException e) {
+            logger.warn("Failed to create V2 group: {}", e.getMessage());
+            return null;
+        }
+        if (decryptedGroup == null) {
+            logger.warn("Failed to create V2 group, unknown error!");
+            return null;
+        }
+
+        final GroupIdV2 groupId = GroupUtils.getGroupIdV2(groupSecretParams);
+        final GroupMasterKey masterKey = groupSecretParams.getMasterKey();
+        GroupInfoV2 g = new GroupInfoV2(groupId, masterKey);
+        g.setGroup(decryptedGroup);
+
+        return g;
+    }
+
+    private byte[] readAvatarBytes(final String avatarFile) throws IOException {
+        final byte[] avatarBytes;
+        try (InputStream avatar = avatarFile == null ? null : new FileInputStream(avatarFile)) {
+            avatarBytes = avatar == null ? null : IOUtils.readFully(avatar);
+        }
+        return avatarBytes;
+    }
+
+    private GroupsV2Operations.NewGroup buildNewGroupV2(
+            String name, Collection<SignalServiceAddress> members, byte[] avatar
+    ) {
+        final ProfileKeyCredential profileKeyCredential = profileKeyCredentialProvider.getProfileKeyCredential(
+                selfAddressProvider.getSelfAddress());
+        if (profileKeyCredential == null) {
+            logger.warn("Cannot create a V2 group as self does not have a versioned profile");
+            return null;
+        }
+
+        if (!areMembersValid(members)) return null;
+
+        GroupCandidate self = new GroupCandidate(selfAddressProvider.getSelfAddress().getUuid().orNull(),
+                Optional.fromNullable(profileKeyCredential));
+        Set<GroupCandidate> candidates = members.stream()
+                .map(member -> new GroupCandidate(member.getUuid().get(),
+                        Optional.fromNullable(profileKeyCredentialProvider.getProfileKeyCredential(member))))
+                .collect(Collectors.toSet());
+
+        final GroupSecretParams groupSecretParams = GroupSecretParams.generate();
+        return groupsV2Operations.createNewGroup(groupSecretParams,
+                name,
+                Optional.fromNullable(avatar),
+                self,
+                candidates,
+                Member.Role.DEFAULT,
+                0);
+    }
+
+    private boolean areMembersValid(final Collection<SignalServiceAddress> members) {
+        final Set<String> noUuidCapability = members.stream()
+                .filter(address -> !address.getUuid().isPresent())
+                .map(SignalServiceAddress::getLegacyIdentifier)
+                .collect(Collectors.toSet());
+        if (noUuidCapability.size() > 0) {
+            logger.warn("Cannot create a V2 group as some members don't have a UUID: {}",
+                    String.join(", ", noUuidCapability));
+            return false;
+        }
+
+        final Set<SignalProfile> noGv2Capability = members.stream()
+                .map(profileProvider::getProfile)
+                .filter(profile -> profile != null && !profile.getCapabilities().gv2)
+                .collect(Collectors.toSet());
+        if (noGv2Capability.size() > 0) {
+            logger.warn("Cannot create a V2 group as some members don't support Groups V2: {}",
+                    noGv2Capability.stream().map(SignalProfile::getName).collect(Collectors.joining(", ")));
+            return false;
+        }
+
+        return true;
+    }
+
+    public Pair<DecryptedGroup, GroupChange> updateGroupV2(
+            GroupInfoV2 groupInfoV2, String name, String avatarFile
+    ) throws IOException {
+        final GroupSecretParams groupSecretParams = GroupSecretParams.deriveFromMasterKey(groupInfoV2.getMasterKey());
+        GroupsV2Operations.GroupOperations groupOperations = groupsV2Operations.forGroup(groupSecretParams);
+
+        GroupChange.Actions.Builder change = name != null
+                ? groupOperations.createModifyGroupTitle(name)
+                : GroupChange.Actions.newBuilder();
+
+        if (avatarFile != null) {
+            final byte[] avatarBytes = readAvatarBytes(avatarFile);
+            String avatarCdnKey = groupsV2Api.uploadAvatar(avatarBytes,
+                    groupSecretParams,
+                    groupAuthorizationProvider.getAuthorizationForToday(groupSecretParams));
+            change.setModifyAvatar(GroupChange.Actions.ModifyAvatarAction.newBuilder().setAvatar(avatarCdnKey));
+        }
+
+        final Optional<UUID> uuid = this.selfAddressProvider.getSelfAddress().getUuid();
+        if (uuid.isPresent()) {
+            change.setSourceUuid(UuidUtil.toByteString(uuid.get()));
+        }
+
+        return commitChange(groupInfoV2, change);
+    }
+
+    public Pair<DecryptedGroup, GroupChange> updateGroupV2(
+            GroupInfoV2 groupInfoV2, Set<SignalServiceAddress> newMembers
+    ) throws IOException {
+        final GroupSecretParams groupSecretParams = GroupSecretParams.deriveFromMasterKey(groupInfoV2.getMasterKey());
+        GroupsV2Operations.GroupOperations groupOperations = groupsV2Operations.forGroup(groupSecretParams);
+
+        if (!areMembersValid(newMembers)) {
+            throw new IOException("Failed to update group");
+        }
+
+        Set<GroupCandidate> candidates = newMembers.stream()
+                .map(member -> new GroupCandidate(member.getUuid().get(),
+                        Optional.fromNullable(profileKeyCredentialProvider.getProfileKeyCredential(member))))
+                .collect(Collectors.toSet());
+
+        final GroupChange.Actions.Builder change = groupOperations.createModifyGroupMembershipChange(candidates,
+                selfAddressProvider.getSelfAddress().getUuid().get());
+
+        final Optional<UUID> uuid = this.selfAddressProvider.getSelfAddress().getUuid();
+        if (uuid.isPresent()) {
+            change.setSourceUuid(UuidUtil.toByteString(uuid.get()));
+        }
+
+        return commitChange(groupInfoV2, change);
+    }
+
+    public Pair<DecryptedGroup, GroupChange> leaveGroup(GroupInfoV2 groupInfoV2) throws IOException {
+        List<DecryptedPendingMember> pendingMembersList = groupInfoV2.getGroup().getPendingMembersList();
+        final UUID selfUuid = selfAddressProvider.getSelfAddress().getUuid().get();
+        Optional<DecryptedPendingMember> selfPendingMember = DecryptedGroupUtil.findPendingByUuid(pendingMembersList,
+                selfUuid);
+
+        if (selfPendingMember.isPresent()) {
+            return revokeInvites(groupInfoV2, Set.of(selfPendingMember.get()));
+        } else {
+            return ejectMembers(groupInfoV2, Set.of(selfUuid));
+        }
+    }
+
+    public GroupChange joinGroup(
+            GroupMasterKey groupMasterKey,
+            GroupLinkPassword groupLinkPassword,
+            DecryptedGroupJoinInfo decryptedGroupJoinInfo
+    ) throws IOException {
+        final GroupSecretParams groupSecretParams = GroupSecretParams.deriveFromMasterKey(groupMasterKey);
+        final GroupsV2Operations.GroupOperations groupOperations = groupsV2Operations.forGroup(groupSecretParams);
+
+        final SignalServiceAddress selfAddress = this.selfAddressProvider.getSelfAddress();
+        final ProfileKeyCredential profileKeyCredential = profileKeyCredentialProvider.getProfileKeyCredential(
+                selfAddress);
+        if (profileKeyCredential == null) {
+            throw new IOException("Cannot join a V2 group as self does not have a versioned profile");
+        }
+
+        boolean requestToJoin = decryptedGroupJoinInfo.getAddFromInviteLink()
+                == AccessControl.AccessRequired.ADMINISTRATOR;
+        GroupChange.Actions.Builder change = requestToJoin
+                ? groupOperations.createGroupJoinRequest(profileKeyCredential)
+                : groupOperations.createGroupJoinDirect(profileKeyCredential);
+
+        change.setSourceUuid(UuidUtil.toByteString(selfAddress.getUuid().get()));
+
+        return commitChange(groupSecretParams, decryptedGroupJoinInfo.getRevision(), change, groupLinkPassword);
+    }
+
+    public Pair<DecryptedGroup, GroupChange> acceptInvite(GroupInfoV2 groupInfoV2) throws IOException {
+        final GroupSecretParams groupSecretParams = GroupSecretParams.deriveFromMasterKey(groupInfoV2.getMasterKey());
+        final GroupsV2Operations.GroupOperations groupOperations = groupsV2Operations.forGroup(groupSecretParams);
+
+        final SignalServiceAddress selfAddress = this.selfAddressProvider.getSelfAddress();
+        final ProfileKeyCredential profileKeyCredential = profileKeyCredentialProvider.getProfileKeyCredential(
+                selfAddress);
+        if (profileKeyCredential == null) {
+            throw new IOException("Cannot join a V2 group as self does not have a versioned profile");
+        }
+
+        final GroupChange.Actions.Builder change = groupOperations.createAcceptInviteChange(profileKeyCredential);
+
+        final Optional<UUID> uuid = selfAddress.getUuid();
+        if (uuid.isPresent()) {
+            change.setSourceUuid(UuidUtil.toByteString(uuid.get()));
+        }
+
+        return commitChange(groupInfoV2, change);
+    }
+
+    public Pair<DecryptedGroup, GroupChange> revokeInvites(
+            GroupInfoV2 groupInfoV2, Set<DecryptedPendingMember> pendingMembers
+    ) throws IOException {
+        final GroupSecretParams groupSecretParams = GroupSecretParams.deriveFromMasterKey(groupInfoV2.getMasterKey());
+        final GroupsV2Operations.GroupOperations groupOperations = groupsV2Operations.forGroup(groupSecretParams);
+        final Set<UuidCiphertext> uuidCipherTexts = pendingMembers.stream().map(member -> {
+            try {
+                return new UuidCiphertext(member.getUuidCipherText().toByteArray());
+            } catch (InvalidInputException e) {
+                throw new AssertionError(e);
+            }
+        }).collect(Collectors.toSet());
+        return commitChange(groupInfoV2, groupOperations.createRemoveInvitationChange(uuidCipherTexts));
+    }
+
+    public Pair<DecryptedGroup, GroupChange> ejectMembers(GroupInfoV2 groupInfoV2, Set<UUID> uuids) throws IOException {
+        final GroupSecretParams groupSecretParams = GroupSecretParams.deriveFromMasterKey(groupInfoV2.getMasterKey());
+        final GroupsV2Operations.GroupOperations groupOperations = groupsV2Operations.forGroup(groupSecretParams);
+        return commitChange(groupInfoV2, groupOperations.createRemoveMembersChange(uuids));
+    }
+
+    private Pair<DecryptedGroup, GroupChange> commitChange(
+            GroupInfoV2 groupInfoV2, GroupChange.Actions.Builder change
+    ) throws IOException {
+        final GroupSecretParams groupSecretParams = GroupSecretParams.deriveFromMasterKey(groupInfoV2.getMasterKey());
+        final GroupsV2Operations.GroupOperations groupOperations = groupsV2Operations.forGroup(groupSecretParams);
+        final DecryptedGroup previousGroupState = groupInfoV2.getGroup();
+        final int nextRevision = previousGroupState.getRevision() + 1;
+        final GroupChange.Actions changeActions = change.setRevision(nextRevision).build();
+        final DecryptedGroupChange decryptedChange;
+        final DecryptedGroup decryptedGroupState;
+
+        try {
+            decryptedChange = groupOperations.decryptChange(changeActions,
+                    selfAddressProvider.getSelfAddress().getUuid().get());
+            decryptedGroupState = DecryptedGroupUtil.apply(previousGroupState, decryptedChange);
+        } catch (VerificationFailedException | InvalidGroupStateException | NotAbleToApplyGroupV2ChangeException e) {
+            throw new IOException(e);
+        }
+
+        GroupChange signedGroupChange = groupsV2Api.patchGroup(changeActions,
+                groupAuthorizationProvider.getAuthorizationForToday(groupSecretParams),
+                Optional.absent());
+
+        return new Pair<>(decryptedGroupState, signedGroupChange);
+    }
+
+    private GroupChange commitChange(
+            GroupSecretParams groupSecretParams,
+            int currentRevision,
+            GroupChange.Actions.Builder change,
+            GroupLinkPassword password
+    ) throws IOException {
+        final int nextRevision = currentRevision + 1;
+        final GroupChange.Actions changeActions = change.setRevision(nextRevision).build();
+
+        return groupsV2Api.patchGroup(changeActions,
+                groupAuthorizationProvider.getAuthorizationForToday(groupSecretParams),
+                Optional.fromNullable(password).transform(GroupLinkPassword::serialize));
+    }
+
+    public DecryptedGroup getUpdatedDecryptedGroup(
+            DecryptedGroup group, byte[] signedGroupChange, GroupMasterKey groupMasterKey
+    ) {
+        try {
+            final DecryptedGroupChange decryptedGroupChange = getDecryptedGroupChange(signedGroupChange,
+                    groupMasterKey);
+            if (decryptedGroupChange == null) {
+                return null;
+            }
+            return DecryptedGroupUtil.apply(group, decryptedGroupChange);
+        } catch (NotAbleToApplyGroupV2ChangeException e) {
+            return null;
+        }
+    }
+
+    private DecryptedGroupChange getDecryptedGroupChange(byte[] signedGroupChange, GroupMasterKey groupMasterKey) {
+        if (signedGroupChange != null) {
+            GroupsV2Operations.GroupOperations groupOperations = groupsV2Operations.forGroup(GroupSecretParams.deriveFromMasterKey(
+                    groupMasterKey));
+
+            try {
+                return groupOperations.decryptChange(GroupChange.parseFrom(signedGroupChange), true).orNull();
+            } catch (VerificationFailedException | InvalidGroupStateException | InvalidProtocolBufferException e) {
+                return null;
+            }
+        }
+
+        return null;
+    }
+}

src/main/java/org/asamk/signal/manager/helper/MessagePipeProvider.java

@@ -0,0 +1,8 @@
+package org.asamk.signal.manager.helper;
+
+import org.whispersystems.signalservice.api.SignalServiceMessagePipe;
+
+public interface MessagePipeProvider {
+
+    SignalServiceMessagePipe getMessagePipe(boolean unidentified);
+}

src/main/java/org/asamk/signal/manager/helper/MessageReceiverProvider.java

@@ -0,0 +1,8 @@
+package org.asamk.signal.manager.helper;
+
+import org.whispersystems.signalservice.api.SignalServiceMessageReceiver;
+
+public interface MessageReceiverProvider {
+
+    SignalServiceMessageReceiver getMessageReceiver();
+}

src/main/java/org/asamk/signal/manager/helper/ProfileHelper.java

@@ -0,0 +1,123 @@
+package org.asamk.signal.manager.helper;
+
+import org.signal.zkgroup.profiles.ProfileKey;
+import org.whispersystems.libsignal.util.guava.Optional;
+import org.whispersystems.signalservice.api.SignalServiceMessagePipe;
+import org.whispersystems.signalservice.api.SignalServiceMessageReceiver;
+import org.whispersystems.signalservice.api.crypto.UnidentifiedAccess;
+import org.whispersystems.signalservice.api.crypto.UnidentifiedAccessPair;
+import org.whispersystems.signalservice.api.profiles.ProfileAndCredential;
+import org.whispersystems.signalservice.api.profiles.SignalServiceProfile;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+import org.whispersystems.signalservice.api.push.exceptions.NotFoundException;
+import org.whispersystems.signalservice.api.push.exceptions.PushNetworkException;
+import org.whispersystems.signalservice.internal.util.concurrent.CascadingFuture;
+import org.whispersystems.signalservice.internal.util.concurrent.ListenableFuture;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+public final class ProfileHelper {
+
+    private final ProfileKeyProvider profileKeyProvider;
+
+    private final UnidentifiedAccessProvider unidentifiedAccessProvider;
+
+    private final MessagePipeProvider messagePipeProvider;
+
+    private final MessageReceiverProvider messageReceiverProvider;
+
+    public ProfileHelper(
+            final ProfileKeyProvider profileKeyProvider,
+            final UnidentifiedAccessProvider unidentifiedAccessProvider,
+            final MessagePipeProvider messagePipeProvider,
+            final MessageReceiverProvider messageReceiverProvider
+    ) {
+        this.profileKeyProvider = profileKeyProvider;
+        this.unidentifiedAccessProvider = unidentifiedAccessProvider;
+        this.messagePipeProvider = messagePipeProvider;
+        this.messageReceiverProvider = messageReceiverProvider;
+    }
+
+    public ProfileAndCredential retrieveProfileSync(
+            SignalServiceAddress recipient, SignalServiceProfile.RequestType requestType
+    ) throws IOException {
+        try {
+            return retrieveProfile(recipient, requestType).get(10, TimeUnit.SECONDS);
+        } catch (ExecutionException e) {
+            if (e.getCause() instanceof PushNetworkException) {
+                throw (PushNetworkException) e.getCause();
+            } else if (e.getCause() instanceof NotFoundException) {
+                throw (NotFoundException) e.getCause();
+            } else {
+                throw new IOException(e);
+            }
+        } catch (InterruptedException | TimeoutException e) {
+            throw new PushNetworkException(e);
+        }
+    }
+
+    public ListenableFuture<ProfileAndCredential> retrieveProfile(
+            SignalServiceAddress address, SignalServiceProfile.RequestType requestType
+    ) {
+        Optional<UnidentifiedAccess> unidentifiedAccess = getUnidentifiedAccess(address);
+        Optional<ProfileKey> profileKey = Optional.fromNullable(profileKeyProvider.getProfileKey(address));
+
+        if (unidentifiedAccess.isPresent()) {
+            return new CascadingFuture<>(Arrays.asList(() -> getPipeRetrievalFuture(address,
+                    profileKey,
+                    unidentifiedAccess,
+                    requestType),
+                    () -> getSocketRetrievalFuture(address, profileKey, unidentifiedAccess, requestType),
+                    () -> getPipeRetrievalFuture(address, profileKey, Optional.absent(), requestType),
+                    () -> getSocketRetrievalFuture(address, profileKey, Optional.absent(), requestType)),
+                    e -> !(e instanceof NotFoundException));
+        } else {
+            return new CascadingFuture<>(Arrays.asList(() -> getPipeRetrievalFuture(address,
+                    profileKey,
+                    Optional.absent(),
+                    requestType), () -> getSocketRetrievalFuture(address, profileKey, Optional.absent(), requestType)),
+                    e -> !(e instanceof NotFoundException));
+        }
+    }
+
+    private ListenableFuture<ProfileAndCredential> getPipeRetrievalFuture(
+            SignalServiceAddress address,
+            Optional<ProfileKey> profileKey,
+            Optional<UnidentifiedAccess> unidentifiedAccess,
+            SignalServiceProfile.RequestType requestType
+    ) throws IOException {
+        SignalServiceMessagePipe unidentifiedPipe = messagePipeProvider.getMessagePipe(true);
+        SignalServiceMessagePipe pipe = unidentifiedPipe != null && unidentifiedAccess.isPresent()
+                ? unidentifiedPipe
+                : messagePipeProvider.getMessagePipe(false);
+        if (pipe != null) {
+            return pipe.getProfile(address, profileKey, unidentifiedAccess, requestType);
+        }
+
+        throw new IOException("No pipe available!");
+    }
+
+    private ListenableFuture<ProfileAndCredential> getSocketRetrievalFuture(
+            SignalServiceAddress address,
+            Optional<ProfileKey> profileKey,
+            Optional<UnidentifiedAccess> unidentifiedAccess,
+            SignalServiceProfile.RequestType requestType
+    ) {
+        SignalServiceMessageReceiver receiver = messageReceiverProvider.getMessageReceiver();
+        return receiver.retrieveProfile(address, profileKey, unidentifiedAccess, requestType);
+    }
+
+    private Optional<UnidentifiedAccess> getUnidentifiedAccess(SignalServiceAddress recipient) {
+        Optional<UnidentifiedAccessPair> unidentifiedAccess = unidentifiedAccessProvider.getAccessFor(recipient);
+
+        if (unidentifiedAccess.isPresent()) {
+            return unidentifiedAccess.get().getTargetUnidentifiedAccess();
+        }
+
+        return Optional.absent();
+    }
+}

src/main/java/org/asamk/signal/manager/helper/ProfileKeyCredentialProvider.java

@@ -0,0 +1,9 @@
+package org.asamk.signal.manager.helper;
+
+import org.signal.zkgroup.profiles.ProfileKeyCredential;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+
+public interface ProfileKeyCredentialProvider {
+
+    ProfileKeyCredential getProfileKeyCredential(SignalServiceAddress address);
+}

src/main/java/org/asamk/signal/manager/helper/ProfileKeyProvider.java

@@ -0,0 +1,9 @@
+package org.asamk.signal.manager.helper;
+
+import org.signal.zkgroup.profiles.ProfileKey;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+
+public interface ProfileKeyProvider {
+
+    ProfileKey getProfileKey(SignalServiceAddress address);
+}

src/main/java/org/asamk/signal/manager/helper/ProfileProvider.java

@@ -0,0 +1,9 @@
+package org.asamk.signal.manager.helper;
+
+import org.asamk.signal.storage.profiles.SignalProfile;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+
+public interface ProfileProvider {
+
+    SignalProfile getProfile(SignalServiceAddress address);
+}

src/main/java/org/asamk/signal/manager/helper/SelfAddressProvider.java

@@ -0,0 +1,8 @@
+package org.asamk.signal.manager.helper;
+
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+
+public interface SelfAddressProvider {
+
+    SignalServiceAddress getSelfAddress();
+}

src/main/java/org/asamk/signal/manager/helper/SelfProfileKeyProvider.java

@@ -0,0 +1,8 @@
+package org.asamk.signal.manager.helper;
+
+import org.signal.zkgroup.profiles.ProfileKey;
+
+public interface SelfProfileKeyProvider {
+
+    ProfileKey getProfileKey();
+}

src/main/java/org/asamk/signal/manager/helper/UnidentifiedAccessHelper.java

@@ -0,0 +1,105 @@
+package org.asamk.signal.manager.helper;
+
+import org.asamk.signal.storage.profiles.SignalProfile;
+import org.signal.libsignal.metadata.certificate.InvalidCertificateException;
+import org.signal.zkgroup.profiles.ProfileKey;
+import org.whispersystems.libsignal.util.guava.Optional;
+import org.whispersystems.signalservice.api.crypto.UnidentifiedAccess;
+import org.whispersystems.signalservice.api.crypto.UnidentifiedAccessPair;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.whispersystems.signalservice.internal.util.Util.getSecretBytes;
+
+public class UnidentifiedAccessHelper {
+
+    private final SelfProfileKeyProvider selfProfileKeyProvider;
+
+    private final ProfileKeyProvider profileKeyProvider;
+
+    private final ProfileProvider profileProvider;
+
+    private final UnidentifiedAccessSenderCertificateProvider senderCertificateProvider;
+
+    public UnidentifiedAccessHelper(
+            final SelfProfileKeyProvider selfProfileKeyProvider,
+            final ProfileKeyProvider profileKeyProvider,
+            final ProfileProvider profileProvider,
+            final UnidentifiedAccessSenderCertificateProvider senderCertificateProvider
+    ) {
+        this.selfProfileKeyProvider = selfProfileKeyProvider;
+        this.profileKeyProvider = profileKeyProvider;
+        this.profileProvider = profileProvider;
+        this.senderCertificateProvider = senderCertificateProvider;
+    }
+
+    public byte[] getSelfUnidentifiedAccessKey() {
+        return UnidentifiedAccess.deriveAccessKeyFrom(selfProfileKeyProvider.getProfileKey());
+    }
+
+    public byte[] getTargetUnidentifiedAccessKey(SignalServiceAddress recipient) {
+        ProfileKey theirProfileKey = profileKeyProvider.getProfileKey(recipient);
+        if (theirProfileKey == null) {
+            return null;
+        }
+
+        SignalProfile targetProfile = profileProvider.getProfile(recipient);
+        if (targetProfile == null || targetProfile.getUnidentifiedAccess() == null) {
+            return null;
+        }
+
+        if (targetProfile.isUnrestrictedUnidentifiedAccess()) {
+            return createUnrestrictedUnidentifiedAccess();
+        }
+
+        return UnidentifiedAccess.deriveAccessKeyFrom(theirProfileKey);
+    }
+
+    public Optional<UnidentifiedAccessPair> getAccessForSync() {
+        byte[] selfUnidentifiedAccessKey = getSelfUnidentifiedAccessKey();
+        byte[] selfUnidentifiedAccessCertificate = senderCertificateProvider.getSenderCertificate();
+
+        if (selfUnidentifiedAccessKey == null || selfUnidentifiedAccessCertificate == null) {
+            return Optional.absent();
+        }
+
+        try {
+            return Optional.of(new UnidentifiedAccessPair(new UnidentifiedAccess(selfUnidentifiedAccessKey,
+                    selfUnidentifiedAccessCertificate),
+                    new UnidentifiedAccess(selfUnidentifiedAccessKey, selfUnidentifiedAccessCertificate)));
+        } catch (InvalidCertificateException e) {
+            return Optional.absent();
+        }
+    }
+
+    public List<Optional<UnidentifiedAccessPair>> getAccessFor(Collection<SignalServiceAddress> recipients) {
+        return recipients.stream().map(this::getAccessFor).collect(Collectors.toList());
+    }
+
+    public Optional<UnidentifiedAccessPair> getAccessFor(SignalServiceAddress recipient) {
+        byte[] recipientUnidentifiedAccessKey = getTargetUnidentifiedAccessKey(recipient);
+        byte[] selfUnidentifiedAccessKey = getSelfUnidentifiedAccessKey();
+        byte[] selfUnidentifiedAccessCertificate = senderCertificateProvider.getSenderCertificate();
+
+        if (recipientUnidentifiedAccessKey == null
+                || selfUnidentifiedAccessKey == null
+                || selfUnidentifiedAccessCertificate == null) {
+            return Optional.absent();
+        }
+
+        try {
+            return Optional.of(new UnidentifiedAccessPair(new UnidentifiedAccess(recipientUnidentifiedAccessKey,
+                    selfUnidentifiedAccessCertificate),
+                    new UnidentifiedAccess(selfUnidentifiedAccessKey, selfUnidentifiedAccessCertificate)));
+        } catch (InvalidCertificateException e) {
+            return Optional.absent();
+        }
+    }
+
+    private static byte[] createUnrestrictedUnidentifiedAccess() {
+        return getSecretBytes(16);
+    }
+}

src/main/java/org/asamk/signal/manager/helper/UnidentifiedAccessProvider.java

@@ -0,0 +1,10 @@
+package org.asamk.signal.manager.helper;
+
+import org.whispersystems.libsignal.util.guava.Optional;
+import org.whispersystems.signalservice.api.crypto.UnidentifiedAccessPair;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+
+public interface UnidentifiedAccessProvider {
+
+    Optional<UnidentifiedAccessPair> getAccessFor(SignalServiceAddress address);
+}

src/main/java/org/asamk/signal/manager/helper/UnidentifiedAccessSenderCertificateProvider.java

@@ -0,0 +1,6 @@
+package org.asamk.signal.manager.helper;
+
+public interface UnidentifiedAccessSenderCertificateProvider {
+
+    byte[] getSenderCertificate();
+}

src/main/java/org/asamk/signal/storage/SignalAccount.java

@@ -10,9 +10,11 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 
+import org.asamk.signal.manager.GroupId;
 import org.asamk.signal.storage.contacts.ContactInfo;
 import org.asamk.signal.storage.contacts.JsonContactsStore;
 import org.asamk.signal.storage.groups.GroupInfo;
+import org.asamk.signal.storage.groups.GroupInfoV1;
 import org.asamk.signal.storage.groups.JsonGroupStore;
 import org.asamk.signal.storage.profiles.ProfileStore;
 import org.asamk.signal.storage.protocol.JsonIdentityKeyStore;
@@ -20,12 +22,15 @@ import org.asamk.signal.storage.protocol.JsonSignalProtocolStore;
 import org.asamk.signal.storage.protocol.RecipientStore;
 import org.asamk.signal.storage.protocol.SessionInfo;
 import org.asamk.signal.storage.protocol.SignalServiceAddressResolver;
+import org.asamk.signal.storage.stickers.StickerStore;
 import org.asamk.signal.storage.threads.LegacyJsonThreadStore;
 import org.asamk.signal.storage.threads.ThreadInfo;
 import org.asamk.signal.util.IOUtils;
 import org.asamk.signal.util.Util;
 import org.signal.zkgroup.InvalidInputException;
 import org.signal.zkgroup.profiles.ProfileKey;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.whispersystems.libsignal.IdentityKeyPair;
 import org.whispersystems.libsignal.state.PreKeyRecord;
 import org.whispersystems.libsignal.state.SignedPreKeyRecord;
@@ -50,6 +55,8 @@ import java.util.stream.Collectors;
 
 public class SignalAccount implements Closeable {
 
+    final static Logger logger = LoggerFactory.getLogger(SignalAccount.class);
+
     private final ObjectMapper jsonProcessor = new ObjectMapper();
     private final FileChannel fileChannel;
     private final FileLock lock;
@@ -71,6 +78,7 @@ public class SignalAccount implements Closeable {
     private JsonContactsStore contactStore;
     private RecipientStore recipientStore;
     private ProfileStore profileStore;
+    private StickerStore stickerStore;
 
     private SignalAccount(final FileChannel fileChannel, final FileLock lock) {
         this.fileChannel = fileChannel;
@@ -82,12 +90,12 @@ public class SignalAccount implements Closeable {
         jsonProcessor.disable(JsonGenerator.Feature.AUTO_CLOSE_TARGET);
     }
 
-    public static SignalAccount load(String dataPath, String username) throws IOException {
-        final String fileName = getFileName(dataPath, username);
+    public static SignalAccount load(File dataPath, String username) throws IOException {
+        final File fileName = getFileName(dataPath, username);
         final Pair<FileChannel, FileLock> pair = openFileChannel(fileName);
         try {
             SignalAccount account = new SignalAccount(pair.first(), pair.second());
-            account.load();
+            account.load(dataPath);
             return account;
         } catch (Throwable e) {
             pair.second().close();
@@ -96,10 +104,12 @@ public class SignalAccount implements Closeable {
         }
     }
 
-    public static SignalAccount create(String dataPath, String username, IdentityKeyPair identityKey, int registrationId, ProfileKey profileKey) throws IOException {
+    public static SignalAccount create(
+            File dataPath, String username, IdentityKeyPair identityKey, int registrationId, ProfileKey profileKey
+    ) throws IOException {
         IOUtils.createPrivateDirectories(dataPath);
-        String fileName = getFileName(dataPath, username);
-        if (!new File(fileName).exists()) {
+        File fileName = getFileName(dataPath, username);
+        if (!fileName.exists()) {
             IOUtils.createPrivateFile(fileName);
         }
 
@@ -109,19 +119,30 @@ public class SignalAccount implements Closeable {
         account.username = username;
         account.profileKey = profileKey;
         account.signalProtocolStore = new JsonSignalProtocolStore(identityKey, registrationId);
-        account.groupStore = new JsonGroupStore();
+        account.groupStore = new JsonGroupStore(getGroupCachePath(dataPath, username));
         account.contactStore = new JsonContactsStore();
         account.recipientStore = new RecipientStore();
         account.profileStore = new ProfileStore();
+        account.stickerStore = new StickerStore();
         account.registered = false;
 
         return account;
     }
 
-    public static SignalAccount createLinkedAccount(String dataPath, String username, UUID uuid, String password, int deviceId, IdentityKeyPair identityKey, int registrationId, String signalingKey, ProfileKey profileKey) throws IOException {
+    public static SignalAccount createLinkedAccount(
+            File dataPath,
+            String username,
+            UUID uuid,
+            String password,
+            int deviceId,
+            IdentityKeyPair identityKey,
+            int registrationId,
+            String signalingKey,
+            ProfileKey profileKey
+    ) throws IOException {
         IOUtils.createPrivateDirectories(dataPath);
-        String fileName = getFileName(dataPath, username);
-        if (!new File(fileName).exists()) {
+        File fileName = getFileName(dataPath, username);
+        if (!fileName.exists()) {
             IOUtils.createPrivateFile(fileName);
         }
 
@@ -135,29 +156,42 @@ public class SignalAccount implements Closeable {
         account.deviceId = deviceId;
         account.signalingKey = signalingKey;
         account.signalProtocolStore = new JsonSignalProtocolStore(identityKey, registrationId);
-        account.groupStore = new JsonGroupStore();
+        account.groupStore = new JsonGroupStore(getGroupCachePath(dataPath, username));
         account.contactStore = new JsonContactsStore();
         account.recipientStore = new RecipientStore();
         account.profileStore = new ProfileStore();
+        account.stickerStore = new StickerStore();
         account.registered = true;
         account.isMultiDevice = true;
 
         return account;
     }
 
-    public static String getFileName(String dataPath, String username) {
-        return dataPath + "/" + username;
+    public static File getFileName(File dataPath, String username) {
+        return new File(dataPath, username);
     }
 
-    public static boolean userExists(String dataPath, String username) {
+    private static File getUserPath(final File dataPath, final String username) {
+        return new File(dataPath, username + ".d");
+    }
+
+    public static File getMessageCachePath(File dataPath, String username) {
+        return new File(getUserPath(dataPath, username), "msg-cache");
+    }
+
+    private static File getGroupCachePath(File dataPath, String username) {
+        return new File(getUserPath(dataPath, username), "group-cache");
+    }
+
+    public static boolean userExists(File dataPath, String username) {
         if (username == null) {
             return false;
         }
-        File f = new File(getFileName(dataPath, username));
+        File f = getFileName(dataPath, username);
         return !(!f.exists() || f.isDirectory());
     }
 
-    private void load() throws IOException {
+    private void load(File dataPath) throws IOException {
         JsonNode rootNode;
         synchronized (fileChannel) {
             fileChannel.position(0);
@@ -200,18 +234,22 @@ public class SignalAccount implements Closeable {
             try {
                 profileKey = new ProfileKey(Base64.decode(Util.getNotNullNode(rootNode, "profileKey").asText()));
             } catch (InvalidInputException e) {
-                throw new IOException("Config file contains an invalid profileKey, needs to be base64 encoded array of 32 bytes", e);
+                throw new IOException(
+                        "Config file contains an invalid profileKey, needs to be base64 encoded array of 32 bytes",
+                        e);
             }
         }
 
-        signalProtocolStore = jsonProcessor.convertValue(Util.getNotNullNode(rootNode, "axolotlStore"), JsonSignalProtocolStore.class);
+        signalProtocolStore = jsonProcessor.convertValue(Util.getNotNullNode(rootNode, "axolotlStore"),
+                JsonSignalProtocolStore.class);
         registered = Util.getNotNullNode(rootNode, "registered").asBoolean();
         JsonNode groupStoreNode = rootNode.get("groupStore");
         if (groupStoreNode != null) {
             groupStore = jsonProcessor.convertValue(groupStoreNode, JsonGroupStore.class);
+            groupStore.groupCachePath = getGroupCachePath(dataPath, username);
         }
         if (groupStore == null) {
-            groupStore = new JsonGroupStore();
+            groupStore = new JsonGroupStore(getGroupCachePath(dataPath, username));
         }
 
         JsonNode contactStoreNode = rootNode.get("contactStore");
@@ -236,9 +274,12 @@ public class SignalAccount implements Closeable {
             }
 
             for (GroupInfo group : groupStore.getGroups()) {
-                group.members = group.members.stream()
-                        .map(m -> recipientStore.resolveServiceAddress(m))
-                        .collect(Collectors.toSet());
+                if (group instanceof GroupInfoV1) {
+                    GroupInfoV1 groupInfoV1 = (GroupInfoV1) group;
+                    groupInfoV1.members = groupInfoV1.members.stream()
+                            .map(m -> recipientStore.resolveServiceAddress(m))
+                            .collect(Collectors.toSet());
+                }
             }
 
             for (SessionInfo session : signalProtocolStore.getSessions()) {
@@ -258,9 +299,18 @@ public class SignalAccount implements Closeable {
             profileStore = new ProfileStore();
         }
 
+        JsonNode stickerStoreNode = rootNode.get("stickerStore");
+        if (stickerStoreNode != null) {
+            stickerStore = jsonProcessor.convertValue(stickerStoreNode, StickerStore.class);
+        }
+        if (stickerStore == null) {
+            stickerStore = new StickerStore();
+        }
+
         JsonNode threadStoreNode = rootNode.get("threadStore");
         if (threadStoreNode != null) {
-            LegacyJsonThreadStore threadStore = jsonProcessor.convertValue(threadStoreNode, LegacyJsonThreadStore.class);
+            LegacyJsonThreadStore threadStore = jsonProcessor.convertValue(threadStoreNode,
+                    LegacyJsonThreadStore.class);
             // Migrate thread info to group and contact store
             for (ThreadInfo thread : threadStore.getThreads()) {
                 if (thread.id == null || thread.id.isEmpty()) {
@@ -272,9 +322,9 @@ public class SignalAccount implements Closeable {
                         contactInfo.messageExpirationTime = thread.messageExpirationTime;
                         contactStore.updateContact(contactInfo);
                     } else {
-                        GroupInfo groupInfo = groupStore.getGroup(Base64.decode(thread.id));
-                        if (groupInfo != null) {
-                            groupInfo.messageExpirationTime = thread.messageExpirationTime;
+                        GroupInfo groupInfo = groupStore.getGroup(GroupId.fromBase64(thread.id));
+                        if (groupInfo instanceof GroupInfoV1) {
+                            ((GroupInfoV1) groupInfo).messageExpirationTime = thread.messageExpirationTime;
                             groupStore.updateGroup(groupInfo);
                         }
                     }
@@ -305,7 +355,7 @@ public class SignalAccount implements Closeable {
                 .putPOJO("contactStore", contactStore)
                 .putPOJO("recipientStore", recipientStore)
                 .putPOJO("profileStore", profileStore)
-        ;
+                .putPOJO("stickerStore", stickerStore);
         try {
             try (ByteArrayOutputStream output = new ByteArrayOutputStream()) {
                 // Write to memory first to prevent corrupting the file in case of serialization errors
@@ -319,17 +369,17 @@ public class SignalAccount implements Closeable {
                 }
             }
         } catch (Exception e) {
-            System.err.println(String.format("Error saving file: %s", e.getMessage()));
+            logger.error("Error saving file: {}", e.getMessage());
         }
     }
 
-    private static Pair<FileChannel, FileLock> openFileChannel(String fileName) throws IOException {
-        FileChannel fileChannel = new RandomAccessFile(new File(fileName), "rw").getChannel();
+    private static Pair<FileChannel, FileLock> openFileChannel(File fileName) throws IOException {
+        FileChannel fileChannel = new RandomAccessFile(fileName, "rw").getChannel();
         FileLock lock = fileChannel.tryLock();
         if (lock == null) {
-            System.err.println("Config file is in use by another instance, waiting…");
+            logger.info("Config file is in use by another instance, waiting…");
             lock = fileChannel.lock();
-            System.err.println("Config file lock acquired.");
+            logger.info("Config file lock acquired.");
         }
         return new Pair<>(fileChannel, lock);
     }
@@ -370,6 +420,10 @@ public class SignalAccount implements Closeable {
         return profileStore;
     }
 
+    public StickerStore getStickerStore() {
+        return stickerStore;
+    }
+
     public String getUsername() {
         return username;
     }

src/main/java/org/asamk/signal/storage/contacts/ContactInfo.java

@@ -7,6 +7,8 @@ import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 
 import java.util.UUID;
 
+import static com.fasterxml.jackson.annotation.JsonProperty.Access.WRITE_ONLY;
+
 public class ContactInfo {
 
     @JsonProperty
@@ -24,7 +26,7 @@ public class ContactInfo {
     @JsonProperty(defaultValue = "0")
     public int messageExpirationTime;
 
-    @JsonProperty
+    @JsonProperty(access = WRITE_ONLY)
     public String profileKey;
 
     @JsonProperty(defaultValue = "false")

src/main/java/org/asamk/signal/storage/groups/GroupInfo.java

@@ -1,123 +1,63 @@
 package org.asamk.signal.storage.groups;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
-import com.fasterxml.jackson.annotation.JsonProperty;
-import com.fasterxml.jackson.core.JsonGenerator;
-import com.fasterxml.jackson.core.JsonParser;
-import com.fasterxml.jackson.databind.DeserializationContext;
-import com.fasterxml.jackson.databind.JsonDeserializer;
-import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.JsonSerializer;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.SerializerProvider;
-import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
-import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 
+import org.asamk.signal.manager.GroupId;
+import org.asamk.signal.manager.GroupInviteLinkUrl;
 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 
-import java.io.IOException;
-import java.util.Collection;
-import java.util.HashSet;
 import java.util.Set;
-import java.util.UUID;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
-public class GroupInfo {
+public abstract class GroupInfo {
 
-    private static final ObjectMapper jsonProcessor = new ObjectMapper();
-
-    @JsonProperty
-    public final byte[] groupId;
-
-    @JsonProperty
-    public String name;
-
-    @JsonProperty
-    @JsonDeserialize(using = MembersDeserializer.class)
-    @JsonSerialize(using = MembersSerializer.class)
-    public Set<SignalServiceAddress> members = new HashSet<>();
-    @JsonProperty
-    public String color;
-    @JsonProperty(defaultValue = "0")
-    public int messageExpirationTime;
-    @JsonProperty(defaultValue = "false")
-    public boolean blocked;
-    @JsonProperty
-    public Integer inboxPosition;
-    @JsonProperty(defaultValue = "false")
-    public boolean archived;
-
-    private long avatarId;
-
-    @JsonProperty
     @JsonIgnore
-    private boolean active;
+    public abstract GroupId getGroupId();
 
-    public GroupInfo(byte[] groupId) {
-        this.groupId = groupId;
-    }
+    @JsonIgnore
+    public abstract String getTitle();
 
-    public GroupInfo(@JsonProperty("groupId") byte[] groupId, @JsonProperty("name") String name, @JsonProperty("members") Collection<SignalServiceAddress> members, @JsonProperty("avatarId") long avatarId, @JsonProperty("color") String color, @JsonProperty("blocked") boolean blocked, @JsonProperty("inboxPosition") Integer inboxPosition, @JsonProperty("archived") boolean archived, @JsonProperty("messageExpirationTime") int messageExpirationTime) {
-        this.groupId = groupId;
-        this.name = name;
-        this.members.addAll(members);
-        this.avatarId = avatarId;
-        this.color = color;
-        this.blocked = blocked;
-        this.inboxPosition = inboxPosition;
-        this.archived = archived;
-        this.messageExpirationTime = messageExpirationTime;
+    @JsonIgnore
+    public abstract GroupInviteLinkUrl getGroupInviteLink();
+
+    @JsonIgnore
+    public abstract Set<SignalServiceAddress> getMembers();
+
+    @JsonIgnore
+    public Set<SignalServiceAddress> getPendingMembers() {
+        return Set.of();
     }
 
     @JsonIgnore
-    public long getAvatarId() {
-        return avatarId;
+    public Set<SignalServiceAddress> getRequestingMembers() {
+        return Set.of();
     }
 
     @JsonIgnore
-    public Set<SignalServiceAddress> getMembers() {
-        return members;
-    }
+    public abstract boolean isBlocked();
 
     @JsonIgnore
-    public Set<String> getMembersE164() {
-        Set<String> membersE164 = new HashSet<>();
-        for (SignalServiceAddress member : members) {
-            if (!member.getNumber().isPresent()) {
-                continue;
-            }
-            membersE164.add(member.getNumber().get());
-        }
-        return membersE164;
-    }
+    public abstract void setBlocked(boolean blocked);
+
+    @JsonIgnore
+    public abstract int getMessageExpirationTime();
 
     @JsonIgnore
     public Set<SignalServiceAddress> getMembersWithout(SignalServiceAddress address) {
-        Set<SignalServiceAddress> members = new HashSet<>(this.members.size());
-        for (SignalServiceAddress member : this.members) {
-            if (!member.matches(address)) {
-                members.add(member);
-            }
-        }
-        return members;
+        return getMembers().stream().filter(member -> !member.matches(address)).collect(Collectors.toSet());
     }
 
-    public void addMembers(Collection<SignalServiceAddress> addresses) {
-        for (SignalServiceAddress address : addresses) {
-            if (this.members.contains(address)) {
-                continue;
-            }
-            removeMember(address);
-            this.members.add(address);
-        }
-    }
-
-    public void removeMember(SignalServiceAddress address) {
-        this.members.removeIf(member -> member.matches(address));
+    @JsonIgnore
+    public Set<SignalServiceAddress> getMembersIncludingPendingWithout(SignalServiceAddress address) {
+        return Stream.concat(getMembers().stream(), getPendingMembers().stream())
+                .filter(member -> !member.matches(address))
+                .collect(Collectors.toSet());
     }
 
     @JsonIgnore
     public boolean isMember(SignalServiceAddress address) {
-        for (SignalServiceAddress member : this.members) {
+        for (SignalServiceAddress member : getMembers()) {
             if (member.matches(address)) {
                 return true;
             }
@@ -125,61 +65,13 @@ public class GroupInfo {
         return false;
     }
 
-    private static final class JsonSignalServiceAddress {
-
-        @JsonProperty
-        private UUID uuid;
-
-        @JsonProperty
-        private String number;
-
-        JsonSignalServiceAddress(@JsonProperty("uuid") final UUID uuid, @JsonProperty("number") final String number) {
-            this.uuid = uuid;
-            this.number = number;
-        }
-
-        JsonSignalServiceAddress(SignalServiceAddress address) {
-            this.uuid = address.getUuid().orNull();
-            this.number = address.getNumber().orNull();
-        }
-
-        SignalServiceAddress toSignalServiceAddress() {
-            return new SignalServiceAddress(uuid, number);
-        }
-    }
-
-    private static class MembersSerializer extends JsonSerializer<Set<SignalServiceAddress>> {
-
-        @Override
-        public void serialize(final Set<SignalServiceAddress> value, final JsonGenerator jgen, final SerializerProvider provider) throws IOException {
-            jgen.writeStartArray(value.size());
-            for (SignalServiceAddress address : value) {
-                if (address.getUuid().isPresent()) {
-                    jgen.writeObject(new JsonSignalServiceAddress(address));
-                } else {
-                    jgen.writeString(address.getNumber().get());
-                }
+    @JsonIgnore
+    public boolean isPendingMember(SignalServiceAddress address) {
+        for (SignalServiceAddress member : getPendingMembers()) {
+            if (member.matches(address)) {
+                return true;
             }
-            jgen.writeEndArray();
-        }
-    }
-
-    private static class MembersDeserializer extends JsonDeserializer<Set<SignalServiceAddress>> {
-
-        @Override
-        public Set<SignalServiceAddress> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
-            Set<SignalServiceAddress> addresses = new HashSet<>();
-            JsonNode node = jsonParser.getCodec().readTree(jsonParser);
-            for (JsonNode n : node) {
-                if (n.isTextual()) {
-                    addresses.add(new SignalServiceAddress(null, n.textValue()));
-                } else {
-                    JsonSignalServiceAddress address = jsonProcessor.treeToValue(n, JsonSignalServiceAddress.class);
-                    addresses.add(address.toSignalServiceAddress());
-                }
-            }
-
-            return addresses;
         }
+        return false;
     }
 }

src/main/java/org/asamk/signal/storage/groups/GroupInfoV1.java

@@ -0,0 +1,212 @@
+package org.asamk.signal.storage.groups;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
+import org.asamk.signal.manager.GroupId;
+import org.asamk.signal.manager.GroupIdV1;
+import org.asamk.signal.manager.GroupIdV2;
+import org.asamk.signal.manager.GroupInviteLinkUrl;
+import org.asamk.signal.manager.GroupUtils;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+
+public class GroupInfoV1 extends GroupInfo {
+
+    private static final ObjectMapper jsonProcessor = new ObjectMapper();
+
+    private final GroupIdV1 groupId;
+
+    private GroupIdV2 expectedV2Id;
+
+    @JsonProperty
+    public String name;
+
+    @JsonProperty
+    @JsonDeserialize(using = MembersDeserializer.class)
+    @JsonSerialize(using = MembersSerializer.class)
+    public Set<SignalServiceAddress> members = new HashSet<>();
+    @JsonProperty
+    public String color;
+    @JsonProperty(defaultValue = "0")
+    public int messageExpirationTime;
+    @JsonProperty(defaultValue = "false")
+    public boolean blocked;
+    @JsonProperty
+    public Integer inboxPosition;
+    @JsonProperty(defaultValue = "false")
+    public boolean archived;
+
+    public GroupInfoV1(GroupIdV1 groupId) {
+        this.groupId = groupId;
+    }
+
+    public GroupInfoV1(
+            @JsonProperty("groupId") byte[] groupId,
+            @JsonProperty("expectedV2Id") byte[] expectedV2Id,
+            @JsonProperty("name") String name,
+            @JsonProperty("members") Collection<SignalServiceAddress> members,
+            @JsonProperty("avatarId") long _ignored_avatarId,
+            @JsonProperty("color") String color,
+            @JsonProperty("blocked") boolean blocked,
+            @JsonProperty("inboxPosition") Integer inboxPosition,
+            @JsonProperty("archived") boolean archived,
+            @JsonProperty("messageExpirationTime") int messageExpirationTime,
+            @JsonProperty("active") boolean _ignored_active
+    ) {
+        this.groupId = GroupId.v1(groupId);
+        this.expectedV2Id = GroupId.v2(expectedV2Id);
+        this.name = name;
+        this.members.addAll(members);
+        this.color = color;
+        this.blocked = blocked;
+        this.inboxPosition = inboxPosition;
+        this.archived = archived;
+        this.messageExpirationTime = messageExpirationTime;
+    }
+
+    @Override
+    @JsonIgnore
+    public GroupIdV1 getGroupId() {
+        return groupId;
+    }
+
+    @JsonProperty("groupId")
+    private byte[] getGroupIdJackson() {
+        return groupId.serialize();
+    }
+
+    @JsonIgnore
+    public GroupIdV2 getExpectedV2Id() {
+        if (expectedV2Id == null) {
+            expectedV2Id = GroupUtils.getGroupIdV2(groupId);
+        }
+        return expectedV2Id;
+    }
+
+    @JsonProperty("expectedV2Id")
+    private byte[] getExpectedV2IdJackson() {
+        return expectedV2Id.serialize();
+    }
+
+    @Override
+    public String getTitle() {
+        return name;
+    }
+
+    @Override
+    public GroupInviteLinkUrl getGroupInviteLink() {
+        return null;
+    }
+
+    @JsonIgnore
+    public Set<SignalServiceAddress> getMembers() {
+        return members;
+    }
+
+    @Override
+    public boolean isBlocked() {
+        return blocked;
+    }
+
+    @Override
+    public void setBlocked(final boolean blocked) {
+        this.blocked = blocked;
+    }
+
+    @Override
+    public int getMessageExpirationTime() {
+        return messageExpirationTime;
+    }
+
+    public void addMembers(Collection<SignalServiceAddress> addresses) {
+        for (SignalServiceAddress address : addresses) {
+            if (this.members.contains(address)) {
+                continue;
+            }
+            removeMember(address);
+            this.members.add(address);
+        }
+    }
+
+    public void removeMember(SignalServiceAddress address) {
+        this.members.removeIf(member -> member.matches(address));
+    }
+
+    private static final class JsonSignalServiceAddress {
+
+        @JsonProperty
+        private UUID uuid;
+
+        @JsonProperty
+        private String number;
+
+        JsonSignalServiceAddress(@JsonProperty("uuid") final UUID uuid, @JsonProperty("number") final String number) {
+            this.uuid = uuid;
+            this.number = number;
+        }
+
+        JsonSignalServiceAddress(SignalServiceAddress address) {
+            this.uuid = address.getUuid().orNull();
+            this.number = address.getNumber().orNull();
+        }
+
+        SignalServiceAddress toSignalServiceAddress() {
+            return new SignalServiceAddress(uuid, number);
+        }
+    }
+
+    private static class MembersSerializer extends JsonSerializer<Set<SignalServiceAddress>> {
+
+        @Override
+        public void serialize(
+                final Set<SignalServiceAddress> value, final JsonGenerator jgen, final SerializerProvider provider
+        ) throws IOException {
+            jgen.writeStartArray(value.size());
+            for (SignalServiceAddress address : value) {
+                if (address.getUuid().isPresent()) {
+                    jgen.writeObject(new JsonSignalServiceAddress(address));
+                } else {
+                    jgen.writeString(address.getNumber().get());
+                }
+            }
+            jgen.writeEndArray();
+        }
+    }
+
+    private static class MembersDeserializer extends JsonDeserializer<Set<SignalServiceAddress>> {
+
+        @Override
+        public Set<SignalServiceAddress> deserialize(
+                JsonParser jsonParser, DeserializationContext deserializationContext
+        ) throws IOException {
+            Set<SignalServiceAddress> addresses = new HashSet<>();
+            JsonNode node = jsonParser.getCodec().readTree(jsonParser);
+            for (JsonNode n : node) {
+                if (n.isTextual()) {
+                    addresses.add(new SignalServiceAddress(null, n.textValue()));
+                } else {
+                    JsonSignalServiceAddress address = jsonProcessor.treeToValue(n, JsonSignalServiceAddress.class);
+                    addresses.add(address.toSignalServiceAddress());
+                }
+            }
+
+            return addresses;
+        }
+    }
+}

src/main/java/org/asamk/signal/storage/groups/GroupInfoV2.java

@@ -0,0 +1,115 @@
+package org.asamk.signal.storage.groups;
+
+import org.asamk.signal.manager.GroupIdV2;
+import org.asamk.signal.manager.GroupInviteLinkUrl;
+import org.signal.storageservice.protos.groups.AccessControl;
+import org.signal.storageservice.protos.groups.local.DecryptedGroup;
+import org.signal.zkgroup.groups.GroupMasterKey;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+import org.whispersystems.signalservice.api.util.UuidUtil;
+
+import java.util.Collections;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+public class GroupInfoV2 extends GroupInfo {
+
+    private final GroupIdV2 groupId;
+    private final GroupMasterKey masterKey;
+
+    private boolean blocked;
+    private DecryptedGroup group; // stored as a file with hexadecimal groupId as name
+
+    public GroupInfoV2(final GroupIdV2 groupId, final GroupMasterKey masterKey) {
+        this.groupId = groupId;
+        this.masterKey = masterKey;
+    }
+
+    @Override
+    public GroupIdV2 getGroupId() {
+        return groupId;
+    }
+
+    public GroupMasterKey getMasterKey() {
+        return masterKey;
+    }
+
+    public void setGroup(final DecryptedGroup group) {
+        this.group = group;
+    }
+
+    public DecryptedGroup getGroup() {
+        return group;
+    }
+
+    @Override
+    public String getTitle() {
+        if (this.group == null) {
+            return null;
+        }
+        return this.group.getTitle();
+    }
+
+    @Override
+    public GroupInviteLinkUrl getGroupInviteLink() {
+        if (this.group == null || this.group.getInviteLinkPassword() == null || (
+                this.group.getAccessControl().getAddFromInviteLink() != AccessControl.AccessRequired.ANY
+                        && this.group.getAccessControl().getAddFromInviteLink()
+                        != AccessControl.AccessRequired.ADMINISTRATOR
+        )) {
+            return null;
+        }
+
+        return GroupInviteLinkUrl.forGroup(masterKey, group);
+    }
+
+    @Override
+    public Set<SignalServiceAddress> getMembers() {
+        if (this.group == null) {
+            return Collections.emptySet();
+        }
+        return group.getMembersList()
+                .stream()
+                .map(m -> new SignalServiceAddress(UuidUtil.parseOrThrow(m.getUuid().toByteArray()), null))
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public Set<SignalServiceAddress> getPendingMembers() {
+        if (this.group == null) {
+            return Collections.emptySet();
+        }
+        return group.getPendingMembersList()
+                .stream()
+                .map(m -> new SignalServiceAddress(UuidUtil.parseOrThrow(m.getUuid().toByteArray()), null))
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public Set<SignalServiceAddress> getRequestingMembers() {
+        if (this.group == null) {
+            return Collections.emptySet();
+        }
+        return group.getRequestingMembersList()
+                .stream()
+                .map(m -> new SignalServiceAddress(UuidUtil.parseOrThrow(m.getUuid().toByteArray()), null))
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public boolean isBlocked() {
+        return blocked;
+    }
+
+    @Override
+    public void setBlocked(final boolean blocked) {
+        this.blocked = blocked;
+    }
+
+    @Override
+    public int getMessageExpirationTime() {
+        return this.group != null && this.group.hasDisappearingMessagesTimer()
+                ? this.group.getDisappearingMessagesTimer().getDuration()
+                : 0;
+    }
+}

src/main/java/org/asamk/signal/storage/groups/JsonGroupStore.java

@@ -12,58 +12,191 @@ import com.fasterxml.jackson.databind.SerializerProvider;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 
+import org.asamk.signal.manager.GroupId;
+import org.asamk.signal.manager.GroupIdV1;
+import org.asamk.signal.manager.GroupIdV2;
+import org.asamk.signal.manager.GroupUtils;
+import org.asamk.signal.util.Hex;
+import org.asamk.signal.util.IOUtils;
+import org.signal.storageservice.protos.groups.local.DecryptedGroup;
+import org.signal.zkgroup.InvalidInputException;
+import org.signal.zkgroup.groups.GroupMasterKey;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.whispersystems.util.Base64;
 
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
 public class JsonGroupStore {
 
-    private static final ObjectMapper jsonProcessor = new ObjectMapper();
+    final static Logger logger = LoggerFactory.getLogger(JsonGroupStore.class);
 
-    public static List<GroupInfo> groupsWithLegacyAvatarId = new ArrayList<>();
+    private static final ObjectMapper jsonProcessor = new ObjectMapper();
+    public File groupCachePath;
 
     @JsonProperty("groups")
-    @JsonSerialize(using = JsonGroupStore.MapToListSerializer.class)
-    @JsonDeserialize(using = JsonGroupStore.GroupsDeserializer.class)
-    private Map<String, GroupInfo> groups = new HashMap<>();
+    @JsonSerialize(using = GroupsSerializer.class)
+    @JsonDeserialize(using = GroupsDeserializer.class)
+    private final Map<GroupId, GroupInfo> groups = new HashMap<>();
+
+    private JsonGroupStore() {
+    }
+
+    public JsonGroupStore(final File groupCachePath) {
+        this.groupCachePath = groupCachePath;
+    }
 
     public void updateGroup(GroupInfo group) {
-        groups.put(Base64.encodeBytes(group.groupId), group);
-    }
-
-    public GroupInfo getGroup(byte[] groupId) {
-        return groups.get(Base64.encodeBytes(groupId));
-    }
-
-    public List<GroupInfo> getGroups() {
-        return new ArrayList<>(groups.values());
-    }
-
-    private static class MapToListSerializer extends JsonSerializer<Map<?, ?>> {
-
-        @Override
-        public void serialize(final Map<?, ?> value, final JsonGenerator jgen, final SerializerProvider provider) throws IOException {
-            jgen.writeObject(value.values());
+        groups.put(group.getGroupId(), group);
+        if (group instanceof GroupInfoV2 && ((GroupInfoV2) group).getGroup() != null) {
+            try {
+                IOUtils.createPrivateDirectories(groupCachePath);
+                try (FileOutputStream stream = new FileOutputStream(getGroupFile(group.getGroupId()))) {
+                    ((GroupInfoV2) group).getGroup().writeTo(stream);
+                }
+                final File groupFileLegacy = getGroupFileLegacy(group.getGroupId());
+                if (groupFileLegacy.exists()) {
+                    groupFileLegacy.delete();
+                }
+            } catch (IOException e) {
+                logger.warn("Failed to cache group, ignoring: {}", e.getMessage());
+            }
         }
     }
 
-    private static class GroupsDeserializer extends JsonDeserializer<Map<String, GroupInfo>> {
+    public void deleteGroup(GroupId groupId) {
+        groups.remove(groupId);
+    }
+
+    public GroupInfo getGroup(GroupId groupId) {
+        GroupInfo group = groups.get(groupId);
+        if (group == null) {
+            if (groupId instanceof GroupIdV1) {
+                group = groups.get(GroupUtils.getGroupIdV2((GroupIdV1) groupId));
+            } else if (groupId instanceof GroupIdV2) {
+                group = getGroupV1ByV2Id((GroupIdV2) groupId);
+            }
+        }
+        loadDecryptedGroup(group);
+        return group;
+    }
+
+    private GroupInfoV1 getGroupV1ByV2Id(GroupIdV2 groupIdV2) {
+        for (GroupInfo g : groups.values()) {
+            if (g instanceof GroupInfoV1) {
+                final GroupInfoV1 gv1 = (GroupInfoV1) g;
+                if (groupIdV2.equals(gv1.getExpectedV2Id())) {
+                    return gv1;
+                }
+            }
+        }
+        return null;
+    }
+
+    private void loadDecryptedGroup(final GroupInfo group) {
+        if (group instanceof GroupInfoV2 && ((GroupInfoV2) group).getGroup() == null) {
+            File groupFile = getGroupFile(group.getGroupId());
+            if (!groupFile.exists()) {
+                groupFile = getGroupFileLegacy(group.getGroupId());
+            }
+            if (!groupFile.exists()) {
+                return;
+            }
+            try (FileInputStream stream = new FileInputStream(groupFile)) {
+                ((GroupInfoV2) group).setGroup(DecryptedGroup.parseFrom(stream));
+            } catch (IOException ignored) {
+            }
+        }
+    }
+
+    private File getGroupFileLegacy(final GroupId groupId) {
+        return new File(groupCachePath, Hex.toStringCondensed(groupId.serialize()));
+    }
+
+    private File getGroupFile(final GroupId groupId) {
+        return new File(groupCachePath, groupId.toBase64().replace("/", "_"));
+    }
+
+    public GroupInfoV1 getOrCreateGroupV1(GroupIdV1 groupId) {
+        GroupInfo group = getGroup(groupId);
+        if (group instanceof GroupInfoV1) {
+            return (GroupInfoV1) group;
+        }
+
+        if (group == null) {
+            return new GroupInfoV1(groupId);
+        }
+
+        return null;
+    }
+
+    public List<GroupInfo> getGroups() {
+        final Collection<GroupInfo> groups = this.groups.values();
+        for (GroupInfo group : groups) {
+            loadDecryptedGroup(group);
+        }
+        return new ArrayList<>(groups);
+    }
+
+    private static class GroupsSerializer extends JsonSerializer<Map<String, GroupInfo>> {
 
         @Override
-        public Map<String, GroupInfo> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
-            Map<String, GroupInfo> groups = new HashMap<>();
+        public void serialize(
+                final Map<String, GroupInfo> value, final JsonGenerator jgen, final SerializerProvider provider
+        ) throws IOException {
+            final Collection<GroupInfo> groups = value.values();
+            jgen.writeStartArray(groups.size());
+            for (GroupInfo group : groups) {
+                if (group instanceof GroupInfoV1) {
+                    jgen.writeObject(group);
+                } else if (group instanceof GroupInfoV2) {
+                    final GroupInfoV2 groupV2 = (GroupInfoV2) group;
+                    jgen.writeStartObject();
+                    jgen.writeStringField("groupId", groupV2.getGroupId().toBase64());
+                    jgen.writeStringField("masterKey", Base64.encodeBytes(groupV2.getMasterKey().serialize()));
+                    jgen.writeBooleanField("blocked", groupV2.isBlocked());
+                    jgen.writeEndObject();
+                } else {
+                    throw new AssertionError("Unknown group version");
+                }
+            }
+            jgen.writeEndArray();
+        }
+    }
+
+    private static class GroupsDeserializer extends JsonDeserializer<Map<GroupId, GroupInfo>> {
+
+        @Override
+        public Map<GroupId, GroupInfo> deserialize(
+                JsonParser jsonParser, DeserializationContext deserializationContext
+        ) throws IOException {
+            Map<GroupId, GroupInfo> groups = new HashMap<>();
             JsonNode node = jsonParser.getCodec().readTree(jsonParser);
             for (JsonNode n : node) {
-                GroupInfo g = jsonProcessor.treeToValue(n, GroupInfo.class);
-                // Check if a legacy avatarId exists
-                if (g.getAvatarId() != 0) {
-                    groupsWithLegacyAvatarId.add(g);
+                GroupInfo g;
+                if (n.has("masterKey")) {
+                    // a v2 group
+                    GroupIdV2 groupId = GroupIdV2.fromBase64(n.get("groupId").asText());
+                    try {
+                        GroupMasterKey masterKey = new GroupMasterKey(Base64.decode(n.get("masterKey").asText()));
+                        g = new GroupInfoV2(groupId, masterKey);
+                    } catch (InvalidInputException e) {
+                        throw new AssertionError("Invalid master key for group " + groupId.toBase64());
+                    }
+                    g.setBlocked(n.get("blocked").asBoolean(false));
+                } else {
+                    GroupInfoV1 gv1 = jsonProcessor.treeToValue(n, GroupInfoV1.class);
+                    g = gv1;
                 }
-                groups.put(Base64.encodeBytes(g.groupId), g);
+                groups.put(g.getGroupId(), g);
             }
 
             return groups;

src/main/java/org/asamk/signal/storage/profiles/ProfileStore.java

@@ -14,13 +14,13 @@ import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 
 import org.signal.zkgroup.InvalidInputException;
 import org.signal.zkgroup.profiles.ProfileKey;
+import org.signal.zkgroup.profiles.ProfileKeyCredential;
 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 import org.whispersystems.signalservice.api.util.UuidUtil;
 import org.whispersystems.util.Base64;
 
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.UUID;
 
@@ -33,7 +33,7 @@ public class ProfileStore {
     @JsonSerialize(using = ProfileStoreSerializer.class)
     private final List<SignalProfileEntry> profiles = new ArrayList<>();
 
-    public SignalProfileEntry getProfile(SignalServiceAddress serviceAddress) {
+    public SignalProfileEntry getProfileEntry(SignalServiceAddress serviceAddress) {
         for (SignalProfileEntry entry : profiles) {
             if (entry.getServiceAddress().matches(serviceAddress)) {
                 return entry;
@@ -42,8 +42,27 @@ public class ProfileStore {
         return null;
     }
 
-    public void updateProfile(SignalServiceAddress serviceAddress, ProfileKey profileKey, long now, SignalProfile profile) {
-        SignalProfileEntry newEntry = new SignalProfileEntry(serviceAddress, profileKey, now, profile);
+    public ProfileKey getProfileKey(SignalServiceAddress serviceAddress) {
+        for (SignalProfileEntry entry : profiles) {
+            if (entry.getServiceAddress().matches(serviceAddress)) {
+                return entry.getProfileKey();
+            }
+        }
+        return null;
+    }
+
+    public void updateProfile(
+            SignalServiceAddress serviceAddress,
+            ProfileKey profileKey,
+            long now,
+            SignalProfile profile,
+            ProfileKeyCredential profileKeyCredential
+    ) {
+        SignalProfileEntry newEntry = new SignalProfileEntry(serviceAddress,
+                profileKey,
+                now,
+                profile,
+                profileKeyCredential);
         for (int i = 0; i < profiles.size(); i++) {
             if (profiles.get(i).getServiceAddress().matches(serviceAddress)) {
                 profiles.set(i, newEntry);
@@ -54,31 +73,55 @@ public class ProfileStore {
         profiles.add(newEntry);
     }
 
+    public void storeProfileKey(SignalServiceAddress serviceAddress, ProfileKey profileKey) {
+        SignalProfileEntry newEntry = new SignalProfileEntry(serviceAddress, profileKey, 0, null, null);
+        for (int i = 0; i < profiles.size(); i++) {
+            if (profiles.get(i).getServiceAddress().matches(serviceAddress)) {
+                if (!profiles.get(i).getProfileKey().equals(profileKey)) {
+                    profiles.set(i, newEntry);
+                }
+                return;
+            }
+        }
+
+        profiles.add(newEntry);
+    }
+
     public static class ProfileStoreDeserializer extends JsonDeserializer<List<SignalProfileEntry>> {
 
         @Override
-        public List<SignalProfileEntry> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
+        public List<SignalProfileEntry> deserialize(
+                JsonParser jsonParser, DeserializationContext deserializationContext
+        ) throws IOException {
             JsonNode node = jsonParser.getCodec().readTree(jsonParser);
 
             List<SignalProfileEntry> addresses = new ArrayList<>();
 
             if (node.isArray()) {
                 for (JsonNode entry : node) {
-                    String name = entry.hasNonNull("name")
-                            ? entry.get("name").asText()
-                            : null;
-                    UUID uuid = entry.hasNonNull("uuid")
-                            ? UuidUtil.parseOrNull(entry.get("uuid").asText())
-                            : null;
+                    String name = entry.hasNonNull("name") ? entry.get("name").asText() : null;
+                    UUID uuid = entry.hasNonNull("uuid") ? UuidUtil.parseOrNull(entry.get("uuid").asText()) : null;
                     final SignalServiceAddress serviceAddress = new SignalServiceAddress(uuid, name);
                     ProfileKey profileKey = null;
                     try {
                         profileKey = new ProfileKey(Base64.decode(entry.get("profileKey").asText()));
                     } catch (InvalidInputException ignored) {
                     }
+                    ProfileKeyCredential profileKeyCredential = null;
+                    if (entry.hasNonNull("profileKeyCredential")) {
+                        try {
+                            profileKeyCredential = new ProfileKeyCredential(Base64.decode(entry.get(
+                                    "profileKeyCredential").asText()));
+                        } catch (Throwable ignored) {
+                        }
+                    }
                     long lastUpdateTimestamp = entry.get("lastUpdateTimestamp").asLong();
                     SignalProfile profile = jsonProcessor.treeToValue(entry.get("profile"), SignalProfile.class);
-                    addresses.add(new SignalProfileEntry(serviceAddress, profileKey, lastUpdateTimestamp, profile));
+                    addresses.add(new SignalProfileEntry(serviceAddress,
+                            profileKey,
+                            lastUpdateTimestamp,
+                            profile,
+                            profileKeyCredential));
                 }
             }
 
@@ -89,7 +132,9 @@ public class ProfileStore {
     public static class ProfileStoreSerializer extends JsonSerializer<List<SignalProfileEntry>> {
 
         @Override
-        public void serialize(List<SignalProfileEntry> profiles, JsonGenerator json, SerializerProvider serializerProvider) throws IOException {
+        public void serialize(
+                List<SignalProfileEntry> profiles, JsonGenerator json, SerializerProvider serializerProvider
+        ) throws IOException {
             json.writeStartArray();
             for (SignalProfileEntry profileEntry : profiles) {
                 final SignalServiceAddress address = profileEntry.getServiceAddress();
@@ -103,6 +148,10 @@ public class ProfileStore {
                 json.writeStringField("profileKey", Base64.encodeBytes(profileEntry.getProfileKey().serialize()));
                 json.writeNumberField("lastUpdateTimestamp", profileEntry.getLastUpdateTimestamp());
                 json.writeObjectField("profile", profileEntry.getProfile());
+                if (profileEntry.getProfileKeyCredential() != null) {
+                    json.writeStringField("profileKeyCredential",
+                            Base64.encodeBytes(profileEntry.getProfileKeyCredential().serialize()));
+                }
                 json.writeEndObject();
             }
             json.writeEndArray();

src/main/java/org/asamk/signal/storage/profiles/SignalProfile.java

@@ -1,5 +1,6 @@
 package org.asamk.signal.storage.profiles;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonProperty;
 
 import org.whispersystems.signalservice.api.profiles.SignalServiceProfile;
@@ -23,18 +24,34 @@ public class SignalProfile {
     private final boolean unrestrictedUnidentifiedAccess;
 
     @JsonProperty
-    private final SignalServiceProfile.Capabilities capabilities;
+    private final Capabilities capabilities;
 
-    public SignalProfile(final String identityKey, final String name, final File avatarFile, final String unidentifiedAccess, final boolean unrestrictedUnidentifiedAccess, final SignalServiceProfile.Capabilities capabilities) {
+    public SignalProfile(
+            final String identityKey,
+            final String name,
+            final File avatarFile,
+            final String unidentifiedAccess,
+            final boolean unrestrictedUnidentifiedAccess,
+            final SignalServiceProfile.Capabilities capabilities
+    ) {
         this.identityKey = identityKey;
         this.name = name;
         this.avatarFile = avatarFile;
         this.unidentifiedAccess = unidentifiedAccess;
         this.unrestrictedUnidentifiedAccess = unrestrictedUnidentifiedAccess;
-        this.capabilities = capabilities;
+        this.capabilities = new Capabilities();
+        this.capabilities.storage = capabilities.isStorage();
+        this.capabilities.gv1Migration = capabilities.isGv1Migration();
+        this.capabilities.gv2 = capabilities.isGv2();
     }
 
-    public SignalProfile(@JsonProperty("identityKey") final String identityKey, @JsonProperty("name") final String name, @JsonProperty("unidentifiedAccess") final String unidentifiedAccess, @JsonProperty("unrestrictedUnidentifiedAccess") final boolean unrestrictedUnidentifiedAccess, @JsonProperty("capabilities") final SignalServiceProfile.Capabilities capabilities) {
+    public SignalProfile(
+            @JsonProperty("identityKey") final String identityKey,
+            @JsonProperty("name") final String name,
+            @JsonProperty("unidentifiedAccess") final String unidentifiedAccess,
+            @JsonProperty("unrestrictedUnidentifiedAccess") final boolean unrestrictedUnidentifiedAccess,
+            @JsonProperty("capabilities") final Capabilities capabilities
+    ) {
         this.identityKey = identityKey;
         this.name = name;
         this.avatarFile = null;
@@ -63,19 +80,43 @@ public class SignalProfile {
         return unrestrictedUnidentifiedAccess;
     }
 
-    public SignalServiceProfile.Capabilities getCapabilities() {
+    public Capabilities getCapabilities() {
         return capabilities;
     }
 
     @Override
     public String toString() {
-        return "SignalProfile{" +
-                "identityKey='" + identityKey + '\'' +
-                ", name='" + name + '\'' +
-                ", avatarFile=" + avatarFile +
-                ", unidentifiedAccess='" + unidentifiedAccess + '\'' +
-                ", unrestrictedUnidentifiedAccess=" + unrestrictedUnidentifiedAccess +
-                ", capabilities=" + capabilities +
-                '}';
+        return "SignalProfile{"
+                + "identityKey='"
+                + identityKey
+                + '\''
+                + ", name='"
+                + name
+                + '\''
+                + ", avatarFile="
+                + avatarFile
+                + ", unidentifiedAccess='"
+                + unidentifiedAccess
+                + '\''
+                + ", unrestrictedUnidentifiedAccess="
+                + unrestrictedUnidentifiedAccess
+                + ", capabilities="
+                + capabilities
+                + '}';
+    }
+
+    public static class Capabilities {
+
+        @JsonIgnore
+        public boolean uuid;
+
+        @JsonProperty
+        public boolean gv2;
+
+        @JsonProperty
+        public boolean storage;
+
+        @JsonProperty
+        public boolean gv1Migration;
     }
 }

src/main/java/org/asamk/signal/storage/profiles/SignalProfileEntry.java

@@ -1,6 +1,7 @@
 package org.asamk.signal.storage.profiles;
 
 import org.signal.zkgroup.profiles.ProfileKey;
+import org.signal.zkgroup.profiles.ProfileKeyCredential;
 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 
 public class SignalProfileEntry {
@@ -13,11 +14,22 @@ public class SignalProfileEntry {
 
     private final SignalProfile profile;
 
-    public SignalProfileEntry(final SignalServiceAddress serviceAddress, final ProfileKey profileKey, final long lastUpdateTimestamp, final SignalProfile profile) {
+    private final ProfileKeyCredential profileKeyCredential;
+
+    private boolean requestPending;
+
+    public SignalProfileEntry(
+            final SignalServiceAddress serviceAddress,
+            final ProfileKey profileKey,
+            final long lastUpdateTimestamp,
+            final SignalProfile profile,
+            final ProfileKeyCredential profileKeyCredential
+    ) {
         this.serviceAddress = serviceAddress;
         this.profileKey = profileKey;
         this.lastUpdateTimestamp = lastUpdateTimestamp;
         this.profile = profile;
+        this.profileKeyCredential = profileKeyCredential;
     }
 
     public SignalServiceAddress getServiceAddress() {
@@ -35,4 +47,16 @@ public class SignalProfileEntry {
     public SignalProfile getProfile() {
         return profile;
     }
+
+    public ProfileKeyCredential getProfileKeyCredential() {
+        return profileKeyCredential;
+    }
+
+    public boolean isRequestPending() {
+        return requestPending;
+    }
+
+    public void setRequestPending(final boolean requestPending) {
+        this.requestPending = requestPending;
+    }
 }

src/main/java/org/asamk/signal/storage/protocol/JsonIdentityKeyStore.java

@@ -10,6 +10,8 @@ import com.fasterxml.jackson.databind.SerializerProvider;
 
 import org.asamk.signal.manager.TrustLevel;
 import org.asamk.signal.util.Util;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.whispersystems.libsignal.IdentityKey;
 import org.whispersystems.libsignal.IdentityKeyPair;
 import org.whispersystems.libsignal.InvalidKeyException;
@@ -27,6 +29,8 @@ import java.util.UUID;
 
 public class JsonIdentityKeyStore implements IdentityKeyStore {
 
+    final static Logger logger = LoggerFactory.getLogger(JsonIdentityKeyStore.class);
+
     private final List<Identity> identities = new ArrayList<>();
 
     private final IdentityKeyPair identityKeyPair;
@@ -63,7 +67,10 @@ public class JsonIdentityKeyStore implements IdentityKeyStore {
 
     @Override
     public boolean saveIdentity(SignalProtocolAddress address, IdentityKey identityKey) {
-        return saveIdentity(resolveSignalServiceAddress(address.getName()), identityKey, TrustLevel.TRUSTED_UNVERIFIED, null);
+        return saveIdentity(resolveSignalServiceAddress(address.getName()),
+                identityKey,
+                TrustLevel.TRUSTED_UNVERIFIED,
+                null);
     }
 
     /**
@@ -75,7 +82,9 @@ public class JsonIdentityKeyStore implements IdentityKeyStore {
      * @param trustLevel     Level of trust: untrusted, trusted, trusted and verified
      * @param added          Added timestamp, if null and the key is newly added, the current time is used.
      */
-    public boolean saveIdentity(SignalServiceAddress serviceAddress, IdentityKey identityKey, TrustLevel trustLevel, Date added) {
+    public boolean saveIdentity(
+            SignalServiceAddress serviceAddress, IdentityKey identityKey, TrustLevel trustLevel, Date added
+    ) {
         for (Identity id : identities) {
             if (!id.address.matches(serviceAddress) || !id.identityKey.equals(identityKey)) {
                 continue;
@@ -99,7 +108,9 @@ public class JsonIdentityKeyStore implements IdentityKeyStore {
      * @param identityKey    The user's public key
      * @param trustLevel     Level of trust: untrusted, trusted, trusted and verified
      */
-    public void setIdentityTrustLevel(SignalServiceAddress serviceAddress, IdentityKey identityKey, TrustLevel trustLevel) {
+    public void setIdentityTrustLevel(
+            SignalServiceAddress serviceAddress, IdentityKey identityKey, TrustLevel trustLevel
+    ) {
         for (Identity id : identities) {
             if (!id.address.matches(serviceAddress) || !id.identityKey.equals(identityKey)) {
                 continue;
@@ -178,7 +189,9 @@ public class JsonIdentityKeyStore implements IdentityKeyStore {
     public static class JsonIdentityKeyStoreDeserializer extends JsonDeserializer<JsonIdentityKeyStore> {
 
         @Override
-        public JsonIdentityKeyStore deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
+        public JsonIdentityKeyStore deserialize(
+                JsonParser jsonParser, DeserializationContext deserializationContext
+        ) throws IOException {
             JsonNode node = jsonParser.getCodec().readTree(jsonParser);
 
             try {
@@ -190,28 +203,27 @@ public class JsonIdentityKeyStore implements IdentityKeyStore {
                 JsonNode trustedKeysNode = node.get("trustedKeys");
                 if (trustedKeysNode.isArray()) {
                     for (JsonNode trustedKey : trustedKeysNode) {
-                        String trustedKeyName = trustedKey.hasNonNull("name")
-                                ? trustedKey.get("name").asText()
-                                : null;
+                        String trustedKeyName = trustedKey.hasNonNull("name") ? trustedKey.get("name").asText() : null;
 
                         if (UuidUtil.isUuid(trustedKeyName)) {
                             // Ignore identities that were incorrectly created with UUIDs as name
                             continue;
                         }
 
-                        UUID uuid = trustedKey.hasNonNull("uuid")
-                                ? UuidUtil.parseOrNull(trustedKey.get("uuid").asText())
-                                : null;
+                        UUID uuid = trustedKey.hasNonNull("uuid") ? UuidUtil.parseOrNull(trustedKey.get("uuid")
+                                .asText()) : null;
                         final SignalServiceAddress serviceAddress = uuid == null
                                 ? Util.getSignalServiceAddressFromIdentifier(trustedKeyName)
                                 : new SignalServiceAddress(uuid, trustedKeyName);
                         try {
                             IdentityKey id = new IdentityKey(Base64.decode(trustedKey.get("identityKey").asText()), 0);
-                            TrustLevel trustLevel = trustedKey.has("trustLevel") ? TrustLevel.fromInt(trustedKey.get("trustLevel").asInt()) : TrustLevel.TRUSTED_UNVERIFIED;
-                            Date added = trustedKey.has("addedTimestamp") ? new Date(trustedKey.get("addedTimestamp").asLong()) : new Date();
+                            TrustLevel trustLevel = trustedKey.has("trustLevel") ? TrustLevel.fromInt(trustedKey.get(
+                                    "trustLevel").asInt()) : TrustLevel.TRUSTED_UNVERIFIED;
+                            Date added = trustedKey.has("addedTimestamp") ? new Date(trustedKey.get("addedTimestamp")
+                                    .asLong()) : new Date();
                             keyStore.saveIdentity(serviceAddress, id, trustLevel, added);
                         } catch (InvalidKeyException | IOException e) {
-                            System.out.println(String.format("Error while decoding key for: %s", trustedKeyName));
+                            logger.warn("Error while decoding key for {}: {}", trustedKeyName, e.getMessage());
                         }
                     }
                 }
@@ -226,10 +238,13 @@ public class JsonIdentityKeyStore implements IdentityKeyStore {
     public static class JsonIdentityKeyStoreSerializer extends JsonSerializer<JsonIdentityKeyStore> {
 
         @Override
-        public void serialize(JsonIdentityKeyStore jsonIdentityKeyStore, JsonGenerator json, SerializerProvider serializerProvider) throws IOException {
+        public void serialize(
+                JsonIdentityKeyStore jsonIdentityKeyStore, JsonGenerator json, SerializerProvider serializerProvider
+        ) throws IOException {
             json.writeStartObject();
             json.writeNumberField("registrationId", jsonIdentityKeyStore.getLocalRegistrationId());
-            json.writeStringField("identityKey", Base64.encodeBytes(jsonIdentityKeyStore.getIdentityKeyPair().serialize()));
+            json.writeStringField("identityKey",
+                    Base64.encodeBytes(jsonIdentityKeyStore.getIdentityKeyPair().serialize()));
             json.writeArrayFieldStart("trustedKeys");
             for (Identity trustedKey : jsonIdentityKeyStore.identities) {
                 json.writeStartObject();
@@ -279,8 +294,7 @@ public class JsonIdentityKeyStore implements IdentityKeyStore {
         }
 
         boolean isTrusted() {
-            return trustLevel == TrustLevel.TRUSTED_UNVERIFIED ||
-                    trustLevel == TrustLevel.TRUSTED_VERIFIED;
+            return trustLevel == TrustLevel.TRUSTED_UNVERIFIED || trustLevel == TrustLevel.TRUSTED_VERIFIED;
         }
 
         public IdentityKey getIdentityKey() {

src/main/java/org/asamk/signal/storage/protocol/JsonPreKeyStore.java

@@ -8,6 +8,8 @@ import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.JsonSerializer;
 import com.fasterxml.jackson.databind.SerializerProvider;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.whispersystems.libsignal.InvalidKeyIdException;
 import org.whispersystems.libsignal.state.PreKeyRecord;
 import org.whispersystems.libsignal.state.PreKeyStore;
@@ -19,6 +21,8 @@ import java.util.Map;
 
 class JsonPreKeyStore implements PreKeyStore {
 
+    final static Logger logger = LoggerFactory.getLogger(JsonPreKeyStore.class);
+
     private final Map<Integer, byte[]> store = new HashMap<>();
 
     public JsonPreKeyStore() {
@@ -60,7 +64,9 @@ class JsonPreKeyStore implements PreKeyStore {
     public static class JsonPreKeyStoreDeserializer extends JsonDeserializer<JsonPreKeyStore> {
 
         @Override
-        public JsonPreKeyStore deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
+        public JsonPreKeyStore deserialize(
+                JsonParser jsonParser, DeserializationContext deserializationContext
+        ) throws IOException {
             JsonNode node = jsonParser.getCodec().readTree(jsonParser);
 
             Map<Integer, byte[]> preKeyMap = new HashMap<>();
@@ -70,7 +76,7 @@ class JsonPreKeyStore implements PreKeyStore {
                     try {
                         preKeyMap.put(preKeyId, Base64.decode(preKey.get("record").asText()));
                     } catch (IOException e) {
-                        System.err.println(String.format("Error while decoding prekey for: %s", preKeyId));
+                        logger.warn("Error while decoding prekey for {}: {}", preKeyId, e.getMessage());
                     }
                 }
             }
@@ -86,7 +92,9 @@ class JsonPreKeyStore implements PreKeyStore {
     public static class JsonPreKeyStoreSerializer extends JsonSerializer<JsonPreKeyStore> {
 
         @Override
-        public void serialize(JsonPreKeyStore jsonPreKeyStore, JsonGenerator json, SerializerProvider serializerProvider) throws IOException {
+        public void serialize(
+                JsonPreKeyStore jsonPreKeyStore, JsonGenerator json, SerializerProvider serializerProvider
+        ) throws IOException {
             json.writeStartArray();
             for (Map.Entry<Integer, byte[]> preKey : jsonPreKeyStore.store.entrySet()) {
                 json.writeStartObject();

src/main/java/org/asamk/signal/storage/protocol/JsonSessionStore.java

@@ -9,6 +9,8 @@ import com.fasterxml.jackson.databind.JsonSerializer;
 import com.fasterxml.jackson.databind.SerializerProvider;
 
 import org.asamk.signal.util.Util;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.whispersystems.libsignal.SignalProtocolAddress;
 import org.whispersystems.libsignal.state.SessionRecord;
 import org.whispersystems.libsignal.state.SessionStore;
@@ -24,6 +26,8 @@ import java.util.UUID;
 
 class JsonSessionStore implements SessionStore {
 
+    final static Logger logger = LoggerFactory.getLogger(JsonSessionStore.class);
+
     private final List<SessionInfo> sessions = new ArrayList<>();
 
     private SignalServiceAddressResolver resolver;
@@ -51,7 +55,7 @@ class JsonSessionStore implements SessionStore {
                 try {
                     return new SessionRecord(info.sessionRecord);
                 } catch (IOException e) {
-                    System.err.println("Failed to load session, resetting session: " + e);
+                    logger.warn("Failed to load session, resetting session: {}", e.getMessage());
                     final SessionRecord sessionRecord = new SessionRecord();
                     info.sessionRecord = sessionRecord.serialize();
                     return sessionRecord;
@@ -126,24 +130,22 @@ class JsonSessionStore implements SessionStore {
     public static class JsonSessionStoreDeserializer extends JsonDeserializer<JsonSessionStore> {
 
         @Override
-        public JsonSessionStore deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
+        public JsonSessionStore deserialize(
+                JsonParser jsonParser, DeserializationContext deserializationContext
+        ) throws IOException {
             JsonNode node = jsonParser.getCodec().readTree(jsonParser);
 
             JsonSessionStore sessionStore = new JsonSessionStore();
 
             if (node.isArray()) {
                 for (JsonNode session : node) {
-                    String sessionName = session.hasNonNull("name")
-                            ? session.get("name").asText()
-                            : null;
+                    String sessionName = session.hasNonNull("name") ? session.get("name").asText() : null;
                     if (UuidUtil.isUuid(sessionName)) {
                         // Ignore sessions that were incorrectly created with UUIDs as name
                         continue;
                     }
 
-                    UUID uuid = session.hasNonNull("uuid")
-                            ? UuidUtil.parseOrNull(session.get("uuid").asText())
-                            : null;
+                    UUID uuid = session.hasNonNull("uuid") ? UuidUtil.parseOrNull(session.get("uuid").asText()) : null;
                     final SignalServiceAddress serviceAddress = uuid == null
                             ? Util.getSignalServiceAddressFromIdentifier(sessionName)
                             : new SignalServiceAddress(uuid, sessionName);
@@ -153,7 +155,7 @@ class JsonSessionStore implements SessionStore {
                         SessionInfo sessionInfo = new SessionInfo(serviceAddress, deviceId, Base64.decode(record));
                         sessionStore.sessions.add(sessionInfo);
                     } catch (IOException e) {
-                        System.err.println(String.format("Error while decoding session for: %s", sessionName));
+                        logger.warn("Error while decoding session for {}: {}", sessionName, e.getMessage());
                     }
                 }
             }
@@ -165,7 +167,9 @@ class JsonSessionStore implements SessionStore {
     public static class JsonSessionStoreSerializer extends JsonSerializer<JsonSessionStore> {
 
         @Override
-        public void serialize(JsonSessionStore jsonSessionStore, JsonGenerator json, SerializerProvider serializerProvider) throws IOException {
+        public void serialize(
+                JsonSessionStore jsonSessionStore, JsonGenerator json, SerializerProvider serializerProvider
+        ) throws IOException {
             json.writeStartArray();
             for (SessionInfo sessionInfo : jsonSessionStore.sessions) {
                 json.writeStartObject();

src/main/java/org/asamk/signal/storage/protocol/JsonSignalProtocolStore.java

@@ -42,7 +42,12 @@ public class JsonSignalProtocolStore implements SignalProtocolStore {
     public JsonSignalProtocolStore() {
     }
 
-    public JsonSignalProtocolStore(JsonPreKeyStore preKeyStore, JsonSessionStore sessionStore, JsonSignedPreKeyStore signedPreKeyStore, JsonIdentityKeyStore identityKeyStore) {
+    public JsonSignalProtocolStore(
+            JsonPreKeyStore preKeyStore,
+            JsonSessionStore sessionStore,
+            JsonSignedPreKeyStore signedPreKeyStore,
+            JsonIdentityKeyStore identityKeyStore
+    ) {
         this.preKeyStore = preKeyStore;
         this.sessionStore = sessionStore;
         this.signedPreKeyStore = signedPreKeyStore;
@@ -80,7 +85,9 @@ public class JsonSignalProtocolStore implements SignalProtocolStore {
         identityKeyStore.saveIdentity(serviceAddress, identityKey, trustLevel, null);
     }
 
-    public void setIdentityTrustLevel(SignalServiceAddress serviceAddress, IdentityKey identityKey, TrustLevel trustLevel) {
+    public void setIdentityTrustLevel(
+            SignalServiceAddress serviceAddress, IdentityKey identityKey, TrustLevel trustLevel
+    ) {
         identityKeyStore.setIdentityTrustLevel(serviceAddress, identityKey, trustLevel);
     }
 

src/main/java/org/asamk/signal/storage/protocol/JsonSignedPreKeyStore.java

@@ -8,6 +8,8 @@ import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.JsonSerializer;
 import com.fasterxml.jackson.databind.SerializerProvider;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.whispersystems.libsignal.InvalidKeyIdException;
 import org.whispersystems.libsignal.state.SignedPreKeyRecord;
 import org.whispersystems.libsignal.state.SignedPreKeyStore;
@@ -21,6 +23,8 @@ import java.util.Map;
 
 class JsonSignedPreKeyStore implements SignedPreKeyStore {
 
+    final static Logger logger = LoggerFactory.getLogger(JsonSignedPreKeyStore.class);
+
     private final Map<Integer, byte[]> store = new HashMap<>();
 
     public JsonSignedPreKeyStore() {
@@ -77,7 +81,9 @@ class JsonSignedPreKeyStore implements SignedPreKeyStore {
     public static class JsonSignedPreKeyStoreDeserializer extends JsonDeserializer<JsonSignedPreKeyStore> {
 
         @Override
-        public JsonSignedPreKeyStore deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
+        public JsonSignedPreKeyStore deserialize(
+                JsonParser jsonParser, DeserializationContext deserializationContext
+        ) throws IOException {
             JsonNode node = jsonParser.getCodec().readTree(jsonParser);
 
             Map<Integer, byte[]> preKeyMap = new HashMap<>();
@@ -87,7 +93,7 @@ class JsonSignedPreKeyStore implements SignedPreKeyStore {
                     try {
                         preKeyMap.put(preKeyId, Base64.decode(preKey.get("record").asText()));
                     } catch (IOException e) {
-                        System.err.println(String.format("Error while decoding prekey for: %s", preKeyId));
+                        logger.warn("Error while decoding prekey for {}: {}", preKeyId, e.getMessage());
                     }
                 }
             }
@@ -103,7 +109,9 @@ class JsonSignedPreKeyStore implements SignedPreKeyStore {
     public static class JsonSignedPreKeyStoreSerializer extends JsonSerializer<JsonSignedPreKeyStore> {
 
         @Override
-        public void serialize(JsonSignedPreKeyStore jsonPreKeyStore, JsonGenerator json, SerializerProvider serializerProvider) throws IOException {
+        public void serialize(
+                JsonSignedPreKeyStore jsonPreKeyStore, JsonGenerator json, SerializerProvider serializerProvider
+        ) throws IOException {
             json.writeStartArray();
             for (Map.Entry<Integer, byte[]> signedPreKey : jsonPreKeyStore.store.entrySet()) {
                 json.writeStartObject();

src/main/java/org/asamk/signal/storage/protocol/RecipientStore.java

@@ -49,7 +49,9 @@ public class RecipientStore {
     public static class RecipientStoreDeserializer extends JsonDeserializer<Set<SignalServiceAddress>> {
 
         @Override
-        public Set<SignalServiceAddress> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
+        public Set<SignalServiceAddress> deserialize(
+                JsonParser jsonParser, DeserializationContext deserializationContext
+        ) throws IOException {
             JsonNode node = jsonParser.getCodec().readTree(jsonParser);
 
             Set<SignalServiceAddress> addresses = new HashSet<>();
@@ -70,7 +72,9 @@ public class RecipientStore {
     public static class RecipientStoreSerializer extends JsonSerializer<Set<SignalServiceAddress>> {
 
         @Override
-        public void serialize(Set<SignalServiceAddress> addresses, JsonGenerator json, SerializerProvider serializerProvider) throws IOException {
+        public void serialize(
+                Set<SignalServiceAddress> addresses, JsonGenerator json, SerializerProvider serializerProvider
+        ) throws IOException {
             json.writeStartArray();
             for (SignalServiceAddress address : addresses) {
                 json.writeStartObject();

src/main/java/org/asamk/signal/storage/stickers/Sticker.java

@@ -0,0 +1,35 @@
+package org.asamk.signal.storage.stickers;
+
+public class Sticker {
+
+    private final byte[] packId;
+    private final byte[] packKey;
+    private boolean installed;
+
+    public Sticker(final byte[] packId, final byte[] packKey) {
+        this.packId = packId;
+        this.packKey = packKey;
+    }
+
+    public Sticker(final byte[] packId, final byte[] packKey, final boolean installed) {
+        this.packId = packId;
+        this.packKey = packKey;
+        this.installed = installed;
+    }
+
+    public byte[] getPackId() {
+        return packId;
+    }
+
+    public byte[] getPackKey() {
+        return packKey;
+    }
+
+    public boolean isInstalled() {
+        return installed;
+    }
+
+    public void setInstalled(final boolean installed) {
+        this.installed = installed;
+    }
+}

src/main/java/org/asamk/signal/storage/stickers/StickerStore.java

@@ -0,0 +1,74 @@
+package org.asamk.signal.storage.stickers;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
+import org.whispersystems.util.Base64;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+public class StickerStore {
+
+    private static final ObjectMapper jsonProcessor = new ObjectMapper();
+
+    @JsonSerialize(using = StickersSerializer.class)
+    @JsonDeserialize(using = StickersDeserializer.class)
+    private final Map<byte[], Sticker> stickers = new HashMap<>();
+
+    public Sticker getSticker(byte[] packId) {
+        return stickers.get(packId);
+    }
+
+    public void updateSticker(Sticker sticker) {
+        stickers.put(sticker.getPackId(), sticker);
+    }
+
+    private static class StickersSerializer extends JsonSerializer<Map<byte[], Sticker>> {
+
+        @Override
+        public void serialize(
+                final Map<byte[], Sticker> value, final JsonGenerator jgen, final SerializerProvider provider
+        ) throws IOException {
+            final Collection<Sticker> stickers = value.values();
+            jgen.writeStartArray(stickers.size());
+            for (Sticker sticker : stickers) {
+                jgen.writeStartObject();
+                jgen.writeStringField("packId", Base64.encodeBytes(sticker.getPackId()));
+                jgen.writeStringField("packKey", Base64.encodeBytes(sticker.getPackKey()));
+                jgen.writeBooleanField("installed", sticker.isInstalled());
+                jgen.writeEndObject();
+            }
+            jgen.writeEndArray();
+        }
+    }
+
+    private static class StickersDeserializer extends JsonDeserializer<Map<byte[], Sticker>> {
+
+        @Override
+        public Map<byte[], Sticker> deserialize(
+                JsonParser jsonParser, DeserializationContext deserializationContext
+        ) throws IOException {
+            Map<byte[], Sticker> stickers = new HashMap<>();
+            JsonNode node = jsonParser.getCodec().readTree(jsonParser);
+            for (JsonNode n : node) {
+                byte[] packId = Base64.decode(n.get("packId").asText());
+                byte[] packKey = Base64.decode(n.get("packKey").asText());
+                boolean installed = n.get("installed").asBoolean(false);
+                stickers.put(packId, new Sticker(packId, packKey, installed));
+            }
+
+            return stickers;
+        }
+    }
+}

src/main/java/org/asamk/signal/storage/threads/LegacyJsonThreadStore.java

@@ -34,7 +34,9 @@ public class LegacyJsonThreadStore {
     private static class MapToListSerializer extends JsonSerializer<Map<?, ?>> {
 
         @Override
-        public void serialize(final Map<?, ?> value, final JsonGenerator jgen, final SerializerProvider provider) throws IOException {
+        public void serialize(
+                final Map<?, ?> value, final JsonGenerator jgen, final SerializerProvider provider
+        ) throws IOException {
             jgen.writeObject(value.values());
         }
     }
@@ -42,7 +44,9 @@ public class LegacyJsonThreadStore {
     private static class ThreadsDeserializer extends JsonDeserializer<Map<String, ThreadInfo>> {
 
         @Override
-        public Map<String, ThreadInfo> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
+        public Map<String, ThreadInfo> deserialize(
+                JsonParser jsonParser, DeserializationContext deserializationContext
+        ) throws IOException {
             Map<String, ThreadInfo> threads = new HashMap<>();
             JsonNode node = jsonParser.getCodec().readTree(jsonParser);
             for (JsonNode n : node) {

src/main/java/org/asamk/signal/util/ErrorUtils.java

@@ -1,14 +1,14 @@
 package org.asamk.signal.util;
 
+import org.asamk.signal.manager.GroupIdFormatException;
 import org.asamk.signal.manager.GroupNotFoundException;
 import org.asamk.signal.manager.NotAGroupMemberException;
-import org.whispersystems.signalservice.api.crypto.UntrustedIdentityException;
-import org.whispersystems.signalservice.api.push.exceptions.EncapsulatedExceptions;
-import org.whispersystems.signalservice.api.push.exceptions.NetworkFailureException;
-import org.whispersystems.signalservice.api.push.exceptions.UnregisteredUserException;
+import org.whispersystems.signalservice.api.messages.SendMessageResult;
 import org.whispersystems.signalservice.api.util.InvalidNumberException;
 
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
 
 public class ErrorUtils {
 
@@ -18,20 +18,42 @@ public class ErrorUtils {
     public static void handleAssertionError(AssertionError e) {
         System.err.println("Failed to send/receive message (Assertion): " + e.getMessage());
         e.printStackTrace();
-        System.err.println("If you use an Oracle JRE please check if you have unlimited strength crypto enabled, see README");
+        System.err.println(
+                "If you use an Oracle JRE please check if you have unlimited strength crypto enabled, see README");
     }
 
-    public static void handleEncapsulatedExceptions(EncapsulatedExceptions e) {
+    public static int handleTimestampAndSendMessageResults(long timestamp, List<SendMessageResult> results) {
+        if (timestamp != 0) {
+            System.out.println(timestamp);
+        }
+        List<String> errors = getErrorMessagesFromSendMessageResults(results);
+        return handleSendMessageResultErrors(errors);
+    }
+
+    public static List<String> getErrorMessagesFromSendMessageResults(List<SendMessageResult> results) {
+        List<String> errors = new ArrayList<>();
+        for (SendMessageResult result : results) {
+            if (result.isNetworkFailure()) {
+                errors.add(String.format("Network failure for \"%s\"", result.getAddress().getLegacyIdentifier()));
+            } else if (result.isUnregisteredFailure()) {
+                errors.add(String.format("Unregistered user \"%s\"", result.getAddress().getLegacyIdentifier()));
+            } else if (result.getIdentityFailure() != null) {
+                errors.add(String.format("Untrusted Identity for \"%s\"", result.getAddress().getLegacyIdentifier()));
+            }
+        }
+
+        return errors;
+    }
+
+    private static int handleSendMessageResultErrors(List<String> errors) {
+        if (errors.size() == 0) {
+            return 0;
+        }
         System.err.println("Failed to send (some) messages:");
-        for (NetworkFailureException n : e.getNetworkExceptions()) {
-            System.err.println("Network failure for \"" + n.getE164number() + "\": " + n.getMessage());
-        }
-        for (UnregisteredUserException n : e.getUnregisteredUserExceptions()) {
-            System.err.println("Unregistered user \"" + n.getE164Number() + "\": " + n.getMessage());
-        }
-        for (UntrustedIdentityException n : e.getUntrustedIdentityExceptions()) {
-            System.err.println("Untrusted Identity for \"" + n.getIdentifier() + "\": " + n.getMessage());
+        for (String error : errors) {
+            System.err.println(error);
         }
+        return 3;
     }
 
     public static void handleIOException(IOException e) {

src/main/java/org/asamk/signal/util/GroupIdFormatException.java

@@ -1,10 +0,0 @@
-package org.asamk.signal.util;
-
-import java.io.IOException;
-
-public class GroupIdFormatException extends Exception {
-
-    public GroupIdFormatException(String groupId, IOException e) {
-        super("Failed to decode groupId (must be base64) \"" + groupId + "\": " + e.getMessage());
-    }
-}

src/main/java/org/asamk/signal/util/Hex.java

@@ -2,9 +2,7 @@ package org.asamk.signal.util;
 
 public class Hex {
 
-    private final static char[] HEX_DIGITS = {
-            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
-    };
+    private final static char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
 
     private Hex() {
     }

src/main/java/org/asamk/signal/util/IOUtils.java

@@ -46,8 +46,7 @@ public class IOUtils {
         return baos.toByteArray();
     }
 
-    public static void createPrivateDirectories(String directoryPath) throws IOException {
-        final File file = new File(directoryPath);
+    public static void createPrivateDirectories(File file) throws IOException {
         if (file.exists()) {
             return;
         }
@@ -61,8 +60,8 @@ public class IOUtils {
         }
     }
 
-    public static void createPrivateFile(String path) throws IOException {
-        final Path file = new File(path).toPath();
+    public static void createPrivateFile(File path) throws IOException {
+        final Path file = path.toPath();
         try {
             Set<PosixFilePermission> perms = EnumSet.of(OWNER_READ, OWNER_WRITE);
             Files.createFile(file, PosixFilePermissions.asFileAttribute(perms));
@@ -71,13 +70,13 @@ public class IOUtils {
         }
     }
 
-    public static String getDataHomeDir() {
+    public static File getDataHomeDir() {
         String dataHome = System.getenv("XDG_DATA_HOME");
         if (dataHome != null) {
-            return dataHome;
+            return new File(dataHome);
         }
 
-        return System.getProperty("user.home") + "/.local/share";
+        return new File(new File(System.getProperty("user.home"), ".local"), "share");
     }
 
     public static void copyStreamToFile(InputStream input, File outputFile) throws IOException {

src/main/java/org/asamk/signal/util/SecurityProvider.java

@@ -16,10 +16,13 @@ public class SecurityProvider extends Provider {
 
         // Workaround for BKS truststore
         put("KeyStore.BKS", org.bouncycastle.jcajce.provider.keystore.bc.BcKeyStoreSpi.Std.class.getCanonicalName());
-        put("KeyStore.BKS-V1", org.bouncycastle.jcajce.provider.keystore.bc.BcKeyStoreSpi.Version1.class.getCanonicalName());
-        put("KeyStore.BouncyCastle", org.bouncycastle.jcajce.provider.keystore.bc.BcKeyStoreSpi.BouncyCastleStore.class.getCanonicalName());
+        put("KeyStore.BKS-V1",
+                org.bouncycastle.jcajce.provider.keystore.bc.BcKeyStoreSpi.Version1.class.getCanonicalName());
+        put("KeyStore.BouncyCastle",
+                org.bouncycastle.jcajce.provider.keystore.bc.BcKeyStoreSpi.BouncyCastleStore.class.getCanonicalName());
         put("KeyFactory.X.509", org.bouncycastle.jcajce.provider.asymmetric.x509.KeyFactory.class.getCanonicalName());
-        put("CertificateFactory.X.509", org.bouncycastle.jcajce.provider.asymmetric.x509.CertificateFactory.class.getCanonicalName());
+        put("CertificateFactory.X.509",
+                org.bouncycastle.jcajce.provider.asymmetric.x509.CertificateFactory.class.getCanonicalName());
     }
 
     public static class DefaultRandom extends SecureRandomSpi {

src/main/java/org/asamk/signal/util/Util.java

@@ -2,13 +2,13 @@ package org.asamk.signal.util;
 
 import com.fasterxml.jackson.databind.JsonNode;
 
+import org.asamk.signal.manager.GroupId;
+import org.asamk.signal.manager.GroupIdFormatException;
 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 import org.whispersystems.signalservice.api.util.InvalidNumberException;
 import org.whispersystems.signalservice.api.util.PhoneNumberFormatter;
 import org.whispersystems.signalservice.api.util.UuidUtil;
-import org.whispersystems.util.Base64;
 
-import java.io.IOException;
 import java.io.InvalidObjectException;
 
 public class Util {
@@ -41,18 +41,15 @@ public class Util {
     public static JsonNode getNotNullNode(JsonNode parent, String name) throws InvalidObjectException {
         JsonNode node = parent.get(name);
         if (node == null) {
-            throw new InvalidObjectException(String.format("Incorrect file format: expected parameter %s not found ", name));
+            throw new InvalidObjectException(String.format("Incorrect file format: expected parameter %s not found ",
+                    name));
         }
 
         return node;
     }
 
-    public static byte[] decodeGroupId(String groupId) throws GroupIdFormatException {
-        try {
-            return Base64.decode(groupId);
-        } catch (IOException e) {
-            throw new GroupIdFormatException(groupId, e);
-        }
+    public static GroupId decodeGroupId(String groupId) throws GroupIdFormatException {
+        return GroupId.fromBase64(groupId);
     }
 
     public static String canonicalizeNumber(String number, String localNumber) throws InvalidNumberException {