Use slf4j simple logger

build.gradle

@@ -21,7 +21,7 @@ dependencies {
     implementation 'org.bouncycastle:bcprov-jdk15on:1.67'
     implementation 'net.sourceforge.argparse4j:argparse4j:0.8.1'
     implementation 'com.github.hypfvieh:dbus-java:3.2.4'
-    implementation 'org.slf4j:slf4j-nop:1.7.30'
+    implementation 'org.slf4j:slf4j-simple:1.7.30'
 }
 
 jar {

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);
     }
 
@@ -72,34 +74,18 @@ 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")) {
+        final File dataPath;
-            try {
+        String config = ns.getString("config");
-                DBusConnection.DBusBusType busType;
+        if (config != null) {
-                if (ns.getBoolean("dbus_system")) {
+            dataPath = new File(config);
-                    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;
-            }
-        } else {
-            String dataPath = ns.getString("config");
-            if (isEmpty(dataPath)) {
             dataPath = getDefaultDataPath();
         }
 
@@ -107,7 +93,7 @@ public class Main {
                 BaseConfig.USER_AGENT);
 
         if (!ServiceConfig.getCapabilities().isGv2()) {
-                System.err.println("WARNING: Support for new group V2 is disabled,"
+            logger.warn("WARNING: Support for new group V2 is disabled,"
                     + " because the required native library dependency is missing: libzkgroup");
         }
 
@@ -120,7 +106,7 @@ public class Main {
         try {
             manager = Manager.init(username, dataPath, serviceConfiguration, BaseConfig.USER_AGENT);
         } catch (Throwable e) {
-                System.err.println("Error loading state file: " + e.getMessage());
+            logger.error("Error loading state file: {}", e.getMessage());
             return 2;
         }
 
@@ -134,16 +120,36 @@ public class Main {
                     return 2;
                 }
             } catch (IOException e) {
-                    System.err.println("Error while checking account: " + e.getMessage());
+                logger.error("Error while checking account: {}", e.getMessage());
                 return 2;
             }
 
             return handleCommands(ns, m);
         } catch (IOException e) {
-                e.printStackTrace();
+            logger.error("Cleanup failed", e);
             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;
+        }
     }
 
     private static int handleCommands(Namespace ns, Signal ts, DBusConnection dBusConn) {
@@ -205,19 +211,19 @@ public class Main {
      *
      * @return the data directory to be used by signal-cli.
      */
-    private static String getDefaultDataPath() {
+    private static File getDefaultDataPath() {
-        String dataPath = IOUtils.getDataHomeDir() + "/signal-cli";
+        File dataPath = new File(IOUtils.getDataHomeDir(), "/signal-cli");
-        if (new File(dataPath).exists()) {
+        if (dataPath.exists()) {
             return dataPath;
         }
 
-        String legacySettingsPath = System.getProperty("user.home") + "/.config/signal";
+        File legacySettingsPath = new File(System.getProperty("user.home"), "/.config/signal");
-        if (new File(legacySettingsPath).exists()) {
+        if (legacySettingsPath.exists()) {
             return legacySettingsPath;
         }
 
-        legacySettingsPath = System.getProperty("user.home") + "/.config/textsecure";
+        legacySettingsPath = new File(System.getProperty("user.home"), "/.config/textsecure");
-        if (new File(legacySettingsPath).exists()) {
+        if (legacySettingsPath.exists()) {
             return legacySettingsPath;
         }
 
@@ -225,32 +231,7 @@ public class Main {
     }
 
     private static Namespace parseArgs(String[] args) {
-        ArgumentParser parser = ArgumentParsers.newFor("signal-cli")
+        ArgumentParser parser = buildArgumentParser();
-                .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);
-        }
 
         Namespace ns;
         try {
@@ -283,4 +264,34 @@ 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/manager/Manager.java

@@ -55,6 +55,8 @@ import org.signal.zkgroup.groups.GroupSecretParams;
 import org.signal.zkgroup.profiles.ClientZkProfileOperations;
 import org.signal.zkgroup.profiles.ProfileKey;
 import org.signal.zkgroup.profiles.ProfileKeyCredential;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.whispersystems.libsignal.IdentityKey;
 import org.whispersystems.libsignal.IdentityKeyPair;
 import org.whispersystems.libsignal.InvalidKeyException;
@@ -173,6 +175,8 @@ import static org.asamk.signal.manager.ServiceConfig.getIasKeyStore;
 
 public class Manager implements Closeable {
 
+    final static Logger logger = LoggerFactory.getLogger(Manager.class);
+
     private final SleepTimer timer = new UptimeSleepTimer();
 
     private final SignalServiceConfiguration serviceConfiguration;
@@ -274,7 +278,7 @@ public class Manager implements Closeable {
     }
 
     public static Manager init(
-            String username, String settingsPath, SignalServiceConfiguration serviceConfiguration, String userAgent
+            String username, File settingsPath, SignalServiceConfiguration serviceConfiguration, String userAgent
     ) throws IOException {
         PathConfig pathConfig = PathConfig.createDefault(settingsPath);
 
@@ -590,7 +594,7 @@ public class Manager implements Closeable {
             try {
                 profile = retrieveRecipientProfile(address, profileKey);
             } catch (IOException e) {
-                System.err.println("Failed to retrieve profile, ignoring: " + e.getMessage());
+                logger.warn("Failed to retrieve profile, ignoring: {}", e.getMessage());
                 profileEntry.setRequestPending(false);
                 return null;
             }
@@ -613,7 +617,7 @@ public class Manager implements Closeable {
                 profileAndCredential = profileHelper.retrieveProfileSync(address,
                         SignalServiceProfile.RequestType.PROFILE_AND_CREDENTIAL);
             } catch (IOException e) {
-                System.err.println("Failed to retrieve profile key credential, ignoring: " + e.getMessage());
+                logger.warn("Failed to retrieve profile key credential, ignoring: {}", e.getMessage());
                 return null;
             }
 
@@ -646,7 +650,7 @@ public class Manager implements Closeable {
                     ? null
                     : retrieveProfileAvatar(address, encryptedProfile.getAvatar(), profileKey);
         } catch (Throwable e) {
-            System.err.println("Failed to retrieve profile avatar, ignoring: " + e.getMessage());
+            logger.warn("Failed to retrieve profile avatar, ignoring: {}", e.getMessage());
         }
 
         ProfileCipher profileCipher = new ProfileCipher(profileKey);
@@ -1327,7 +1331,7 @@ public class Manager implements Closeable {
         try {
             certificate = accountManager.getSenderCertificate();
         } catch (IOException e) {
-            System.err.println("Failed to get sender certificate: " + e);
+            logger.warn("Failed to get sender certificate, ignoring: {}", e.getMessage());
             return null;
         }
         // TODO cache for a day
@@ -1366,7 +1370,7 @@ public class Manager implements Closeable {
                     missingUuids.stream().map(a -> a.getNumber().get()).collect(Collectors.toSet()),
                     CDS_MRENCLAVE);
         } catch (IOException | Quote.InvalidQuoteFormatException | UnauthenticatedQuoteException | SignatureException | UnauthenticatedResponseException e) {
-            System.err.println("Failed to resolve uuids from server: " + e.getMessage());
+            logger.warn("Failed to resolve uuids from server, ignoring: {}", e.getMessage());
             registeredUsers = new HashMap<>();
         }
 
@@ -1570,8 +1574,9 @@ public class Manager implements Closeable {
                                     try {
                                         retrieveGroupAvatarAttachment(avatar.asPointer(), groupV1.getGroupId());
                                     } catch (IOException | InvalidMessageException | MissingConfigurationException e) {
-                                        System.err.println("Failed to retrieve group avatar (" + avatar.asPointer()
+                                        logger.warn("Failed to retrieve avatar for group {}, ignoring: {}",
-                                                .getRemoteId() + "): " + e.getMessage());
+                                                groupId.toBase64(),
+                                                e.getMessage());
                                     }
                                 }
                             }
@@ -1593,7 +1598,7 @@ public class Manager implements Closeable {
                         }
                         case DELIVER:
                             if (groupV1 == null && !isSync) {
-                                actions.add(new SendGroupInfoRequestAction(source, groupV1.getGroupId()));
+                                actions.add(new SendGroupInfoRequestAction(source, groupId));
                             }
                             break;
                         case QUIT: {
@@ -1658,10 +1663,9 @@ public class Manager implements Closeable {
                     try {
                         retrieveAttachment(attachment.asPointer());
                     } catch (IOException | InvalidMessageException | MissingConfigurationException e) {
-                        System.err.println("Failed to retrieve attachment ("
+                        logger.warn("Failed to retrieve attachment ({}), ignoring: {}",
-                                + attachment.asPointer().getRemoteId()
+                                attachment.asPointer().getRemoteId(),
-                                + "): "
+                                e.getMessage());
-                                + e.getMessage());
                     }
                 }
             }
@@ -1686,10 +1690,9 @@ public class Manager implements Closeable {
                     try {
                         retrieveAttachment(attachment);
                     } catch (IOException | InvalidMessageException | MissingConfigurationException e) {
-                        System.err.println("Failed to retrieve attachment ("
+                        logger.warn("Failed to retrieve preview image ({}), ignoring: {}",
-                                + attachment.getRemoteId()
+                                attachment.getRemoteId(),
-                                + "): "
+                                e.getMessage());
-                                + e.getMessage());
                     }
                 }
             }
@@ -1703,10 +1706,9 @@ public class Manager implements Closeable {
                     try {
                         retrieveAttachment(attachment.asPointer());
                     } catch (IOException | InvalidMessageException | MissingConfigurationException e) {
-                        System.err.println("Failed to retrieve attachment ("
+                        logger.warn("Failed to retrieve quote attachment thumbnail ({}), ignoring: {}",
-                                + attachment.asPointer().getRemoteId()
+                                attachment.asPointer().getRemoteId(),
-                                + "): "
+                                e.getMessage());
-                                + e.getMessage());
                     }
                 }
             }
@@ -1734,11 +1736,9 @@ public class Manager implements Closeable {
             // Received a v2 group message for a v1 group, we need to locally migrate the group
             account.getGroupStore().deleteGroup(groupInfo.getGroupId());
             groupInfoV2 = new GroupInfoV2(groupId, groupMasterKey);
-            System.err.println("Locally migrated group "
+            logger.info("Locally migrated group {} to group v2, id: {}",
-                    + groupInfo.getGroupId().toBase64()
+                    groupInfo.getGroupId().toBase64(),
-                    + " to group v2, id: "
+                    groupInfoV2.getGroupId().toBase64());
-                    + groupInfoV2.getGroupId().toBase64()
-                    + " !!!");
         } else if (groupInfo instanceof GroupInfoV2) {
             groupInfoV2 = (GroupInfoV2) groupInfo;
         } else {
@@ -1757,10 +1757,13 @@ public class Manager implements Closeable {
             }
             if (group != null) {
                 storeProfileKeysFromMembers(group);
+                final String avatar = group.getAvatar();
+                if (avatar != null && !avatar.isEmpty()) {
                     try {
-                    retrieveGroupAvatar(groupId, groupSecretParams, group.getAvatar());
+                        retrieveGroupAvatar(groupId, groupSecretParams, avatar);
                     } catch (IOException e) {
-                    System.err.println("Failed to download group avatar, ignoring ...");
+                        logger.warn("Failed to download group avatar, ignoring: {}", e.getMessage());
+                    }
                 }
             }
             groupInfoV2.setGroup(group);
@@ -1830,7 +1833,7 @@ public class Manager implements Closeable {
                 try {
                     Files.delete(fileEntry.toPath());
                 } catch (IOException e) {
-                    System.err.println("Failed to delete cached message file “" + fileEntry + "”: " + e.getMessage());
+                    logger.warn("Failed to delete cached message file “{}”, ignoring: {}", fileEntry, e.getMessage());
                 }
                 return;
             }
@@ -1848,7 +1851,7 @@ public class Manager implements Closeable {
         try {
             Files.delete(fileEntry.toPath());
         } catch (IOException e) {
-            System.err.println("Failed to delete cached message file “" + fileEntry + "”: " + e.getMessage());
+            logger.warn("Failed to delete cached message file “{}”, ignoring: {}", fileEntry, e.getMessage());
         }
     }
 
@@ -1880,8 +1883,7 @@ public class Manager implements Closeable {
                         File cacheFile = getMessageCacheFile(source, now, envelope1.getTimestamp());
                         Utils.storeEnvelope(envelope1, cacheFile);
                     } catch (IOException e) {
-                        System.err.println("Failed to store encrypted message in disk cache, ignoring: "
+                        logger.warn("Failed to store encrypted message in disk cache, ignoring: {}", e.getMessage());
-                                + e.getMessage());
                     }
                 });
                 if (result.isPresent()) {
@@ -1910,7 +1912,7 @@ public class Manager implements Closeable {
                 if (returnOnTimeout) return;
                 continue;
             } catch (InvalidVersionException e) {
-                System.err.println("Ignoring error: " + e.getMessage());
+                logger.warn("Error while receiving messages, ignoring: {}", e.getMessage());
                 continue;
             }
 
@@ -1954,7 +1956,7 @@ public class Manager implements Closeable {
                     // Try to delete directory if empty
                     new File(getMessageCachePath()).delete();
                 } catch (IOException e) {
-                    System.err.println("Failed to delete cached message file “" + cacheFile + "”: " + e.getMessage());
+                    logger.warn("Failed to delete cached message file “{}”, ignoring: {}", cacheFile, e.getMessage());
                 }
             }
         }
@@ -2088,16 +2090,18 @@ public class Manager implements Closeable {
                             }
                         }
                     } catch (Exception e) {
+                        logger.warn("Failed to handle received sync groups “{}”, ignoring: {}",
+                                tmpFile,
+                                e.getMessage());
                         e.printStackTrace();
                     } finally {
                         if (tmpFile != null) {
                             try {
                                 Files.delete(tmpFile.toPath());
                             } catch (IOException e) {
-                                System.err.println("Failed to delete received groups temp file “"
+                                logger.warn("Failed to delete received groups temp file “{}”, ignoring: {}",
-                                        + tmpFile
+                                        tmpFile,
-                                        + "”: "
+                                        e.getMessage());
-                                        + e.getMessage());
                             }
                         }
                     }
@@ -2114,8 +2118,8 @@ public class Manager implements Closeable {
                         try {
                             setGroupBlocked(groupId, true);
                         } catch (GroupNotFoundException e) {
-                            System.err.println("BlockedListMessage contained groupID that was not found in GroupStore: "
+                            logger.warn("BlockedListMessage contained groupID that was not found in GroupStore: {}",
-                                    + groupId.toBase64());
+                                    groupId.toBase64());
                         }
                     }
                 }
@@ -2176,10 +2180,9 @@ public class Manager implements Closeable {
                             try {
                                 Files.delete(tmpFile.toPath());
                             } catch (IOException e) {
-                                System.err.println("Failed to delete received contacts temp file “"
+                                logger.warn("Failed to delete received contacts temp file “{}”, ignoring: {}",
-                                        + tmpFile
+                                        tmpFile,
-                                        + "”: "
+                                        e.getMessage());
-                                        + e.getMessage());
                             }
                         }
                     }
@@ -2275,7 +2278,9 @@ public class Manager implements Closeable {
             try {
                 Files.delete(tmpFile.toPath());
             } catch (IOException e) {
-                System.err.println("Failed to delete received avatar temp file “" + tmpFile + "”: " + e.getMessage());
+                logger.warn("Failed to delete received group avatar temp file “{}”, ignoring: {}",
+                        tmpFile,
+                        e.getMessage());
             }
         }
         return outputFile;
@@ -2303,7 +2308,9 @@ public class Manager implements Closeable {
             try {
                 Files.delete(tmpFile.toPath());
             } catch (IOException e) {
-                System.err.println("Failed to delete received avatar temp file “" + tmpFile + "”: " + e.getMessage());
+                logger.warn("Failed to delete received profile avatar temp file “{}”, ignoring: {}",
+                        tmpFile,
+                        e.getMessage());
             }
         }
         return outputFile;
@@ -2343,10 +2350,9 @@ public class Manager implements Closeable {
             try {
                 Files.delete(tmpFile.toPath());
             } catch (IOException e) {
-                System.err.println("Failed to delete received attachment temp file “"
+                logger.warn("Failed to delete received attachment temp file “{}”, ignoring: {}",
-                        + tmpFile
+                        tmpFile,
-                        + "”: "
+                        e.getMessage());
-                        + e.getMessage());
             }
         }
         return outputFile;
@@ -2397,7 +2403,7 @@ public class Manager implements Closeable {
             try {
                 Files.delete(groupsFile.toPath());
             } catch (IOException e) {
-                System.err.println("Failed to delete groups temp file “" + groupsFile + "”: " + e.getMessage());
+                logger.warn("Failed to delete groups temp file “{}”, ignoring: {}", groupsFile, e.getMessage());
             }
         }
     }
@@ -2462,7 +2468,7 @@ public class Manager implements Closeable {
             try {
                 Files.delete(contactsFile.toPath());
             } catch (IOException e) {
-                System.err.println("Failed to delete contacts temp file “" + contactsFile + "”: " + e.getMessage());
+                logger.warn("Failed to delete contacts temp file “{}”, ignoring: {}", contactsFile, e.getMessage());
             }
         }
     }

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

@@ -1,30 +1,34 @@
 package org.asamk.signal.manager;
 
+import java.io.File;
+
 public class PathConfig {
 
-    private final String dataPath;
+    private final File dataPath;
-    private final String attachmentsPath;
+    private final File attachmentsPath;
-    private final String avatarsPath;
+    private final File avatarsPath;
 
-    public static PathConfig createDefault(final String settingsPath) {
+    public static PathConfig createDefault(final File settingsPath) {
-        return new PathConfig(settingsPath + "/data", settingsPath + "/attachments", settingsPath + "/avatars");
+        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() {
-        return dataPath;
+        return dataPath.getPath();
     }
 
     public String getAttachmentsPath() {
-        return attachmentsPath;
+        return attachmentsPath.getPath();
     }
 
     public String getAvatarsPath() {
-        return avatarsPath;
+        return avatarsPath.getPath();
     }
 }

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;

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

@@ -6,6 +6,7 @@ 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;
@@ -20,6 +21,8 @@ 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;
@@ -44,6 +47,8 @@ import java.util.stream.Collectors;
 
 public class GroupHelper {
 
+    final static Logger logger = LoggerFactory.getLogger(GroupHelper.class);
+
     private final ProfileKeyCredentialProvider profileKeyCredentialProvider;
 
     private final ProfileProvider profileProvider;
@@ -78,7 +83,7 @@ public class GroupHelper {
                     groupSecretParams);
             return groupsV2Api.getGroup(groupSecretParams, groupsV2AuthorizationString);
         } catch (IOException | VerificationFailedException | InvalidGroupStateException e) {
-            System.err.println("Failed to retrieve Group V2 info, ignoring ...");
+            logger.warn("Failed to retrieve Group V2 info, ignoring: {}", e.getMessage());
             return null;
         }
     }
@@ -111,11 +116,11 @@ public class GroupHelper {
             groupsV2Api.putNewGroup(newGroup, groupAuthForToday);
             decryptedGroup = groupsV2Api.getGroup(groupSecretParams, groupAuthForToday);
         } catch (IOException | VerificationFailedException | InvalidGroupStateException e) {
-            System.err.println("Failed to create V2 group: " + e.getMessage());
+            logger.warn("Failed to create V2 group: {}", e.getMessage());
             return null;
         }
         if (decryptedGroup == null) {
-            System.err.println("Failed to create V2 group!");
+            logger.warn("Failed to create V2 group, unknown error!");
             return null;
         }
 
@@ -141,7 +146,7 @@ public class GroupHelper {
         final ProfileKeyCredential profileKeyCredential = profileKeyCredentialProvider.getProfileKeyCredential(
                 selfAddressProvider.getSelfAddress());
         if (profileKeyCredential == null) {
-            System.err.println("Cannot create a V2 group as self does not have a versioned profile");
+            logger.warn("Cannot create a V2 group as self does not have a versioned profile");
             return null;
         }
 
@@ -165,22 +170,23 @@ public class GroupHelper {
     }
 
     private boolean areMembersValid(final Collection<SignalServiceAddress> members) {
-        final int noUuidCapability = members.stream()
+        final Set<String> noUuidCapability = members.stream()
                 .filter(address -> !address.getUuid().isPresent())
-                .collect(Collectors.toUnmodifiableSet())
+                .map(SignalServiceAddress::getLegacyIdentifier)
-                .size();
+                .collect(Collectors.toSet());
-        if (noUuidCapability > 0) {
+        if (noUuidCapability.size() > 0) {
-            System.err.println("Cannot create a V2 group as " + noUuidCapability + " members don't have a UUID.");
+            logger.warn("Cannot create a V2 group as some members don't have a UUID: {}",
+                    String.join(", ", noUuidCapability));
             return false;
         }
 
-        final int noGv2Capability = members.stream()
+        final Set<SignalProfile> noGv2Capability = members.stream()
                 .map(profileProvider::getProfile)
                 .filter(profile -> profile != null && !profile.getCapabilities().gv2)
-                .collect(Collectors.toUnmodifiableSet())
+                .collect(Collectors.toSet());
-                .size();
+        if (noGv2Capability.size() > 0) {
-        if (noGv2Capability > 0) {
+            logger.warn("Cannot create a V2 group as some members don't support Groups V2: {}",
-            System.err.println("Cannot create a V2 group as " + noGv2Capability + " members don't support Groups V2.");
+                    noGv2Capability.stream().map(SignalProfile::getName).collect(Collectors.joining(", ")));
             return false;
         }
 
@@ -219,7 +225,9 @@ public class GroupHelper {
         final GroupSecretParams groupSecretParams = GroupSecretParams.deriveFromMasterKey(groupInfoV2.getMasterKey());
         GroupsV2Operations.GroupOperations groupOperations = groupsV2Operations.forGroup(groupSecretParams);
 
-        if (!areMembersValid(newMembers)) return null;
+        if (!areMembersValid(newMembers)) {
+            throw new IOException("Failed to update group");
+        }
 
         Set<GroupCandidate> candidates = newMembers.stream()
                 .map(member -> new GroupCandidate(member.getUuid().get(),

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

@@ -29,6 +29,8 @@ 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;
@@ -53,6 +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;
@@ -357,7 +361,7 @@ 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());
         }
     }
 
@@ -365,9 +369,9 @@ public class SignalAccount implements Closeable {
         FileChannel fileChannel = new RandomAccessFile(new File(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);
     }

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

@@ -21,6 +21,8 @@ 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;
@@ -35,6 +37,8 @@ import java.util.Map;
 
 public class JsonGroupStore {
 
+    final static Logger logger = LoggerFactory.getLogger(JsonGroupStore.class);
+
     private static final ObjectMapper jsonProcessor = new ObjectMapper();
     public File groupCachePath;
 
@@ -63,7 +67,7 @@ public class JsonGroupStore {
                     groupFileLegacy.delete();
                 }
             } catch (IOException e) {
-                System.err.println("Failed to cache group, ignoring ...");
+                logger.warn("Failed to cache group, ignoring: {}", e.getMessage());
             }
         }
     }

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;
@@ -219,7 +223,7 @@ public class JsonIdentityKeyStore implements IdentityKeyStore {
                                     .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());
                         }
                     }
                 }

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() {
@@ -72,7 +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());
                     }
                 }
             }

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;
@@ -151,7 +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());
                     }
                 }
             }

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() {
@@ -89,7 +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());
                     }
                 }
             }