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

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 {