Merge branch 'specific-group-updates' into data-extraction-2

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationActivity.java

@@ -158,7 +158,6 @@ import org.thoughtcrime.securesms.mms.GlideRequests;
 import org.thoughtcrime.securesms.mms.ImageSlide;
 import org.thoughtcrime.securesms.mms.MediaConstraints;
 import org.thoughtcrime.securesms.mms.MmsException;
-import org.session.libsession.messaging.messages.signal.OutgoingExpirationUpdateMessage;
 import org.session.libsession.messaging.messages.signal.OutgoingMediaMessage;
 import org.session.libsession.messaging.messages.signal.OutgoingSecureMediaMessage;
 import org.thoughtcrime.securesms.mms.QuoteId;
@@ -175,6 +174,7 @@ import org.session.libsession.messaging.threads.recipients.RecipientModifiedList
 import org.thoughtcrime.securesms.search.model.MessageResult;
 import org.session.libsession.messaging.sending_receiving.MessageSender;
 import org.session.libsession.messaging.messages.signal.OutgoingTextMessage;
+import org.thoughtcrime.securesms.service.ExpiringMessageManager;
 import org.thoughtcrime.securesms.util.BitmapUtil;
 import org.thoughtcrime.securesms.util.DateUtils;
 import org.thoughtcrime.securesms.util.MediaUtil;
@@ -806,15 +806,13 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
         @Override
         protected Void doInBackground(Void... params) {
           DatabaseFactory.getRecipientDatabase(ConversationActivity.this).setExpireMessages(recipient, expirationTime);
-          ExpirationTimerUpdate message = new ExpirationTimerUpdate(null, expirationTime);
+          ExpirationTimerUpdate message = new ExpirationTimerUpdate(expirationTime);
+          message.setRecipient(recipient.getAddress().serialize()); // we need the recipient in ExpiringMessageManager.insertOutgoingExpirationTimerMessage
           message.setSentTimestamp(System.currentTimeMillis());
-          OutgoingExpirationUpdateMessage outgoingMessage = OutgoingExpirationUpdateMessage.from(message, recipient);
+          ExpiringMessageManager expiringMessageManager = ApplicationContext.getInstance(getApplicationContext()).getExpiringMessageManager();
-          try {
+          expiringMessageManager.setExpirationTimer(message);
-            message.setId(DatabaseFactory.getMmsDatabase(ConversationActivity.this).insertMessageOutbox(outgoingMessage, getAllocatedThreadId(ConversationActivity.this), false, null));
+          MessageSender.send(message, recipient.getAddress());
-            MessageSender.send(message, recipient.getAddress());
+
-          } catch (MmsException e) {
-            Log.w(TAG, e);
-          }
           return null;
         }
 

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationUpdateItem.java

@@ -14,12 +14,10 @@ import androidx.annotation.ColorInt;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
-
 import org.session.libsession.messaging.sending_receiving.dataextraction.DataExtractionNotificationInfoMessage;
 import org.thoughtcrime.securesms.BindableConversationItem;
 import org.thoughtcrime.securesms.database.model.MessageRecord;
 import org.thoughtcrime.securesms.loki.utilities.GeneralUtilitiesKt;
-import org.thoughtcrime.securesms.loki.utilities.GroupDescription;
 import org.thoughtcrime.securesms.mms.GlideRequests;
 import org.thoughtcrime.securesms.util.DateUtils;
 import org.session.libsignal.libsignal.util.guava.Optional;
@@ -193,8 +191,6 @@ public class ConversationUpdateItem extends LinearLayout
   private void setGroupRecord(MessageRecord messageRecord) {
     icon.setImageResource(R.drawable.ic_group_grey600_24dp);
     icon.clearColorFilter();
-
-    GroupDescription.Companion.getDescription(getContext(), messageRecord.getBody()).addListener(this);
     body.setText(messageRecord.getDisplayBody(getContext()));
 
     title.setVisibility(GONE);

app/src/main/java/org/thoughtcrime/securesms/database/MmsDatabase.java

@@ -514,15 +514,7 @@ public class MmsDatabase extends MessagingDatabase {
           }
         }
 
-        if (body != null && (Types.isGroupQuit(outboxType) || Types.isGroupUpdate(outboxType))) {
+        OutgoingMediaMessage message = new OutgoingMediaMessage(recipient, body, attachments, timestamp, subscriptionId, expiresIn, distributionType, quote, contacts, previews, networkFailures, mismatches);
-          return new OutgoingGroupMediaMessage(recipient, body, attachments, timestamp, 0, quote, contacts, previews);
-        } else if (Types.isExpirationTimerUpdate(outboxType)) {
-          return new OutgoingExpirationUpdateMessage(recipient, timestamp, expiresIn);
-        }
-
-        boolean expirationTimer = (outboxType & Types.EXPIRATION_TIMER_UPDATE_BIT) != 0;
-
-        OutgoingMediaMessage message = new OutgoingMediaMessage(recipient, body, attachments, timestamp, subscriptionId, expiresIn, expirationTimer, distributionType, quote, contacts, previews, networkFailures, mismatches);
 
         if (Types.isSecureType(outboxType)) {
           return new OutgoingSecureMediaMessage(message);
@@ -532,8 +524,6 @@ public class MmsDatabase extends MessagingDatabase {
       }
 
       throw new NoSuchMessageException("No record found for id: " + messageId);
-    } catch (IOException e) {
-      throw new MmsException(e);
     } finally {
       if (cursor != null)
         cursor.close();
@@ -689,8 +679,19 @@ public class MmsDatabase extends MessagingDatabase {
   {
     if (threadId == -1) {
       if(retrieved.isGroup()) {
-        ByteString decodedGroupId = ((OutgoingGroupMediaMessage)retrieved).getGroupContext().getId();
+        String decodedGroupId;
-        String groupId = GroupUtil.doubleEncodeGroupID(decodedGroupId.toByteArray());
+        if (retrieved instanceof OutgoingExpirationUpdateMessage) {
+          decodedGroupId = ((OutgoingExpirationUpdateMessage)retrieved).getGroupId();
+        } else {
+          decodedGroupId = ((OutgoingGroupMediaMessage)retrieved).getGroupId();
+        }
+        String groupId;
+        try {
+          groupId = GroupUtil.doubleEncodeGroupID(decodedGroupId);
+        } catch (IOException e) {
+          Log.e(TAG, "Couldn't encrypt group ID");
+          throw new MmsException(e);
+        }
         Recipient group = Recipient.from(context, Address.fromSerialized(groupId), false);
         threadId = DatabaseFactory.getThreadDatabase(context).getOrCreateThreadIdFor(group);
       } else {
@@ -753,9 +754,8 @@ public class MmsDatabase extends MessagingDatabase {
     if (message.isSecure()) type |= (Types.SECURE_MESSAGE_BIT | Types.PUSH_MESSAGE_BIT);
     if (forceSms)           type |= Types.MESSAGE_FORCE_SMS_BIT;
 
-    if (message.isGroup()) {
+    if (message.isGroup() && message instanceof OutgoingGroupMediaMessage) {
-      if      (((OutgoingGroupMediaMessage)message).isGroupUpdate()) type |= Types.GROUP_UPDATE_BIT;
+      if (((OutgoingGroupMediaMessage)message).isUpdateMessage()) type |= Types.GROUP_UPDATE_MESSAGE_BIT;
-      else if (((OutgoingGroupMediaMessage)message).isGroupQuit())   type |= Types.GROUP_QUIT_BIT;
     }
 
     if (message.isExpirationUpdate()) {

app/src/main/java/org/thoughtcrime/securesms/database/MmsSmsColumns.java

@@ -70,6 +70,7 @@ public interface MmsSmsColumns {
     protected static final long GROUP_UPDATE_BIT            = 0x10000;
     protected static final long GROUP_QUIT_BIT              = 0x20000;
     protected static final long EXPIRATION_TIMER_UPDATE_BIT = 0x40000;
+    protected static final long GROUP_UPDATE_MESSAGE_BIT    = 0x80000;
 
     // Data Extraction Information
     protected static final long MEDIA_SAVED_EXTRACTION_BIT = 0x01000;
@@ -225,6 +226,8 @@ public interface MmsSmsColumns {
       return (type & GROUP_UPDATE_BIT) != 0;
     }
 
+    public static boolean isGroupUpdateMessage(long type) { return (type & GROUP_UPDATE_MESSAGE_BIT) != 0; }
+
     public static boolean isGroupQuit(long type) {
       return (type & GROUP_QUIT_BIT) != 0;
     }

app/src/main/java/org/thoughtcrime/securesms/database/SmsDatabase.java

@@ -347,8 +347,7 @@ public class SmsDatabase extends MessagingDatabase {
       type |= Types.SECURE_MESSAGE_BIT;
     } else if (message.isGroup()) {
       type |= Types.SECURE_MESSAGE_BIT;
-      if      (((IncomingGroupMessage)message).isUpdate()) type |= Types.GROUP_UPDATE_BIT;
+      if (((IncomingGroupMessage)message).isUpdateMessage()) type |= Types.GROUP_UPDATE_MESSAGE_BIT;
-      else if (((IncomingGroupMessage)message).isQuit())   type |= Types.GROUP_QUIT_BIT;
     }
 
     if (message.isPush())                type |= Types.PUSH_MESSAGE_BIT;

app/src/main/java/org/thoughtcrime/securesms/database/Storage.kt

@@ -23,6 +23,8 @@ import org.session.libsession.messaging.threads.Address
 import org.session.libsession.messaging.threads.Address.Companion.fromSerialized
 import org.session.libsession.messaging.threads.GroupRecord
 import org.session.libsession.messaging.threads.recipients.Recipient
+import org.session.libsession.messaging.utilities.UpdateMessageBuilder
+import org.session.libsession.messaging.utilities.UpdateMessageData
 import org.session.libsession.utilities.GroupUtil
 import org.session.libsession.utilities.IdentityKeyUtil
 import org.session.libsession.utilities.TextSecurePreferences
@@ -42,6 +44,7 @@ import org.thoughtcrime.securesms.loki.utilities.OpenGroupUtilities
 import org.thoughtcrime.securesms.loki.utilities.get
 import org.thoughtcrime.securesms.loki.utilities.getString
 import org.thoughtcrime.securesms.mms.PartAuthority
+import java.util.*
 
 class Storage(context: Context, helper: SQLCipherOpenHelper) : Database(context, helper), StorageProtocol {
     override fun getUserPublicKey(): String? {
@@ -85,6 +88,11 @@ class Storage(context: Context, helper: SQLCipherOpenHelper) : Database(context,
         return recipient.profileKey
     }
 
+    override fun getDisplayNameForRecipient(recipientPublicKey: String): String? {
+        val database = DatabaseFactory.getLokiUserDatabase(context)
+        return database.getDisplayName(recipientPublicKey)
+    }
+
     override fun setProfileKeyForRecipient(recipientPublicKey: String, profileKey: ByteArray) {
         val address = Address.fromSerialized(recipientPublicKey)
         val recipient = Recipient.from(context, address, false)
@@ -395,30 +403,21 @@ class Storage(context: Context, helper: SQLCipherOpenHelper) : Database(context,
         DatabaseFactory.getGroupDatabase(context).updateMembers(groupID, members)
     }
 
-    override fun insertIncomingInfoMessage(context: Context, senderPublicKey: String, groupID: String, type0: SignalServiceProtos.GroupContext.Type, type1: SignalServiceGroup.Type, name: String, members: Collection<String>, admins: Collection<String>, sentTimestamp: Long) {
+    override fun insertIncomingInfoMessage(context: Context, senderPublicKey: String, groupID: String, type: SignalServiceGroup.Type, name: String, members: Collection<String>, admins: Collection<String>, sentTimestamp: Long) {
-        val groupContextBuilder = SignalServiceProtos.GroupContext.newBuilder()
+        val group = SignalServiceGroup(type, GroupUtil.getDecodedGroupIDAsData(groupID), SignalServiceGroup.GroupType.SIGNAL, name, members.toList(), null, admins.toList())
-                .setId(ByteString.copyFrom(GroupUtil.getDecodedGroupIDAsData(groupID)))
-                .setType(type0)
-                .setName(name)
-                .addAllMembers(members)
-                .addAllAdmins(admins)
-        val group = SignalServiceGroup(type1, GroupUtil.getDecodedGroupIDAsData(groupID), SignalServiceGroup.GroupType.SIGNAL, name, members.toList(), null, admins.toList())
         val m = IncomingTextMessage(Address.fromSerialized(senderPublicKey), 1, sentTimestamp, "", Optional.of(group), 0, true)
-        val infoMessage = IncomingGroupMessage(m, groupContextBuilder.build(), "")
+        val updateData = UpdateMessageData.buildGroupUpdate(type, name, members).toJSON()
+        val infoMessage = IncomingGroupMessage(m, groupID, updateData, true)
         val smsDB = DatabaseFactory.getSmsDatabase(context)
         smsDB.insertMessageInbox(infoMessage)
     }
 
-    override fun insertOutgoingInfoMessage(context: Context, groupID: String, type: SignalServiceProtos.GroupContext.Type, name: String, members: Collection<String>, admins: Collection<String>, threadID: Long, sentTimestamp: Long) {
+    override fun insertOutgoingInfoMessage(context: Context, groupID: String, type: SignalServiceGroup.Type, name: String, members: Collection<String>, admins: Collection<String>, threadID: Long, sentTimestamp: Long) {
         val userPublicKey = getUserPublicKey()
         val recipient = Recipient.from(context, Address.fromSerialized(groupID), false)
-        val groupContextBuilder = SignalServiceProtos.GroupContext.newBuilder()
+
-                .setId(ByteString.copyFrom(GroupUtil.getDecodedGroupIDAsData(groupID)))
+        val updateData = UpdateMessageData.buildGroupUpdate(type, name, members).toJSON()
-                .setType(type)
+        val infoMessage = OutgoingGroupMediaMessage(recipient, updateData, groupID, null, sentTimestamp, 0, true, null, listOf(), listOf())
-                .setName(name)
-                .addAllMembers(members)
-                .addAllAdmins(admins)
-        val infoMessage = OutgoingGroupMediaMessage(recipient, groupContextBuilder.build(), null, sentTimestamp, 0, false, null, listOf(), listOf())
         val mmsDB = DatabaseFactory.getMmsDatabase(context)
         val mmsSmsDB = DatabaseFactory.getMmsSmsDatabase(context)
         if (mmsSmsDB.getMessageFor(sentTimestamp, userPublicKey) != null) return

app/src/main/java/org/thoughtcrime/securesms/database/model/DisplayRecord.java

@@ -109,6 +109,7 @@ public abstract class DisplayRecord {
 
   public boolean isLokiSessionRestoreDone() { return SmsDatabase.Types.isLokiSessionRestoreDoneType(type); }
 
+  // TODO isGroupUpdate and isGroupQuit are kept for compatibility with old update messages, they can be removed later on
   public boolean isGroupUpdate() {
     return SmsDatabase.Types.isGroupUpdate(type);
   }
@@ -117,8 +118,13 @@ public abstract class DisplayRecord {
     return SmsDatabase.Types.isGroupQuit(type);
   }
 
+  public boolean isGroupUpdateMessage() {
+    return SmsDatabase.Types.isGroupUpdateMessage(type);
+  }
+
+  //TODO isGroupAction can be replaced by isGroupUpdateMessage in the code when the 2 functions above are removed
   public boolean isGroupAction() {
-    return isGroupUpdate() || isGroupQuit();
+    return isGroupUpdate() || isGroupQuit() || isGroupUpdateMessage();
   }
 
   public boolean isExpirationTimerUpdate() {

app/src/main/java/org/thoughtcrime/securesms/database/model/MessageRecord.java

@@ -24,14 +24,15 @@ import android.text.style.RelativeSizeSpan;
 import android.text.style.StyleSpan;
 
 import network.loki.messenger.R;
+
+import org.session.libsession.messaging.utilities.UpdateMessageBuilder;
+import org.session.libsession.messaging.utilities.UpdateMessageData;
 import org.thoughtcrime.securesms.database.MmsSmsColumns;
 import org.thoughtcrime.securesms.database.SmsDatabase;
 import org.session.libsession.database.documents.IdentityKeyMismatch;
 import org.session.libsession.database.documents.NetworkFailure;
 
 import org.session.libsession.messaging.threads.recipients.Recipient;
-import org.session.libsession.utilities.ExpirationUtil;
-import org.thoughtcrime.securesms.loki.utilities.GroupDescription;
 
 import java.util.List;
 
@@ -90,42 +91,22 @@ public abstract class MessageRecord extends DisplayRecord {
 
   @Override
   public SpannableString getDisplayBody(@NonNull Context context) {
-    if (isGroupUpdate() && isOutgoing()) {
+    if(isGroupUpdateMessage()) {
+      UpdateMessageData updateMessageData = UpdateMessageData.Companion.fromJSON(getBody());
+      return new SpannableString(UpdateMessageBuilder.INSTANCE.buildGroupUpdateMessage(context, updateMessageData, getIndividualRecipient().getAddress().serialize(), isOutgoing()));
+    } else if (isExpirationTimerUpdate()) {
+      int seconds = (int) (getExpiresIn() / 1000);
+      return new SpannableString(UpdateMessageBuilder.INSTANCE.buildExpirationTimerMessage(context, seconds, getIndividualRecipient().getAddress().serialize(), isOutgoing()));
+    }
+    // TODO below lines are left here for compatibility with older group update messages, it can be deleted later on
+    else if (isGroupUpdate() && isOutgoing()) {
       return new SpannableString(context.getString(R.string.MessageRecord_you_updated_group));
     } else if (isGroupUpdate()) {
-      return new SpannableString(GroupDescription.Companion.getDescription(context, getBody()).toString(getIndividualRecipient()));
+      return new SpannableString(context.getString(R.string.MessageRecord_s_updated_group, getIndividualRecipient().toShortString()));
     } else if (isGroupQuit() && isOutgoing()) {
       return new SpannableString(context.getString(R.string.MessageRecord_left_group));
     } else if (isGroupQuit()) {
       return new SpannableString(context.getString(R.string.ConversationItem_group_action_left, getIndividualRecipient().toShortString()));
-    } else if (isDataExtraction()) {
-      if (isMediaSavedExtraction()) return new SpannableString(context.getString(R.string.MessageRecord_media_saved_by_s, getIndividualRecipient().toShortString()));
-      if (isScreenshotExtraction()) return new SpannableString(context.getString(R.string.MessageRecord_s_took_a_screenshot, getIndividualRecipient().toShortString()));
-    } else if (isIncomingCall()) {
-      return new SpannableString(context.getString(R.string.MessageRecord_s_called_you, getIndividualRecipient().toShortString()));
-    } else if (isOutgoingCall()) {
-      return new SpannableString(context.getString(R.string.MessageRecord_you_called));
-    } else if (isMissedCall()) {
-      return new SpannableString(context.getString(R.string.MessageRecord_missed_call));
-    } else if (isJoined()) {
-      return new SpannableString(context.getString(R.string.MessageRecord_s_joined_signal, getIndividualRecipient().toShortString()));
-    } else if (isExpirationTimerUpdate()) {
-      int seconds = (int)(getExpiresIn() / 1000);
-      if (seconds <= 0) {
-        return isOutgoing() ? new SpannableString(context.getString(R.string.MessageRecord_you_disabled_disappearing_messages))
-                            : new SpannableString(context.getString(R.string.MessageRecord_s_disabled_disappearing_messages, getIndividualRecipient().toShortString()));
-      }
-      String time = ExpirationUtil.getExpirationDisplayValue(context, seconds);
-      return isOutgoing() ? new SpannableString(context.getString(R.string.MessageRecord_you_set_disappearing_message_time_to_s, time))
-                          : new SpannableString(context.getString(R.string.MessageRecord_s_set_disappearing_message_time_to_s, getIndividualRecipient().toShortString(), time));
-    } else if (isIdentityUpdate()) {
-      return new SpannableString(context.getString(R.string.MessageRecord_your_safety_number_with_s_has_changed, getIndividualRecipient().toShortString()));
-    } else if (isIdentityVerified()) {
-      if (isOutgoing()) return new SpannableString(context.getString(R.string.MessageRecord_you_marked_your_safety_number_with_s_verified, getIndividualRecipient().toShortString()));
-      else              return new SpannableString(context.getString(R.string.MessageRecord_you_marked_your_safety_number_with_s_verified_from_another_device, getIndividualRecipient().toShortString()));
-    } else if (isIdentityDefault()) {
-      if (isOutgoing()) return new SpannableString(context.getString(R.string.MessageRecord_you_marked_your_safety_number_with_s_unverified, getIndividualRecipient().toShortString()));
-      else              return new SpannableString(context.getString(R.string.MessageRecord_you_marked_your_safety_number_with_s_unverified_from_another_device, getIndividualRecipient().toShortString()));
     }
 
     return new SpannableString(getBody());

app/src/main/java/org/thoughtcrime/securesms/database/model/ThreadRecord.java

@@ -28,6 +28,8 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import org.session.libsession.messaging.threads.recipients.Recipient;
+import org.session.libsession.messaging.utilities.UpdateMessageBuilder;
+import org.session.libsession.messaging.utilities.UpdateMessageData;
 import org.session.libsession.utilities.ExpirationUtil;
 import org.thoughtcrime.securesms.database.MmsSmsColumns;
 import org.thoughtcrime.securesms.database.SmsDatabase;
@@ -73,7 +75,7 @@ public class ThreadRecord extends DisplayRecord {
   @Override
   public SpannableString getDisplayBody(@NonNull Context context) {
     Recipient recipient = getRecipient();
-    if (isGroupUpdate()) {
+    if (isGroupUpdate() || isGroupUpdateMessage()) {
       return emphasisAdded(context.getString(R.string.ThreadRecord_group_updated));
     } else if (isGroupQuit()) {
       return emphasisAdded(context.getString(R.string.ThreadRecord_left_the_group));

app/src/main/java/org/thoughtcrime/securesms/loki/protocol/ClosedGroupsProtocolV2.kt

@@ -9,7 +9,6 @@ import org.session.libsignal.libsignal.ecc.ECKeyPair
 import org.session.libsignal.service.api.messages.SignalServiceGroup
 import org.session.libsignal.service.internal.push.SignalServiceProtos
 import org.session.libsignal.service.internal.push.SignalServiceProtos.DataMessage
-import org.session.libsignal.service.internal.push.SignalServiceProtos.GroupContext
 import org.session.libsignal.service.loki.utilities.removing05PrefixIfNeeded
 import org.session.libsignal.service.loki.utilities.toHexString
 import org.thoughtcrime.securesms.database.DatabaseFactory
@@ -104,11 +103,11 @@ object ClosedGroupsProtocolV2 {
         apiDB.addClosedGroupEncryptionKeyPair(encryptionKeyPair, groupPublicKey)
         // Notify the user (if we didn't make the group)
         if (userPublicKey != senderPublicKey) {
-            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, GroupContext.Type.UPDATE, SignalServiceGroup.Type.UPDATE, name, members, admins, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, SignalServiceGroup.Type.UPDATE, name, members, admins, sentTimestamp)
         } else if (prevGroup == null) {
             // only notify if we created this group
             val threadID = DatabaseFactory.getLokiThreadDatabase(context).getThreadID(groupID)
-            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, GroupContext.Type.UPDATE, name, members, admins, threadID, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, SignalServiceGroup.Type.UPDATE, name, members, admins, threadID, sentTimestamp)
         }
         // Notify the PN server
         LokiPushNotificationManager.performOperation(context, ClosedGroupOperation.Subscribe, groupPublicKey, userPublicKey)
@@ -156,14 +155,14 @@ object ClosedGroupsProtocolV2 {
                 MessageSender.generateAndSendNewEncryptionKeyPair(groupPublicKey, newMembers)
             }
         }
-        val (contextType, signalType) =
+        val type =
-                if (senderLeft) GroupContext.Type.QUIT to SignalServiceGroup.Type.QUIT
+                if (senderLeft) SignalServiceGroup.Type.QUIT
-                else GroupContext.Type.UPDATE to SignalServiceGroup.Type.UPDATE
+                else SignalServiceGroup.Type.UPDATE
         if (userPublicKey == senderPublicKey) {
             val threadID = DatabaseFactory.getLokiThreadDatabase(context).getThreadID(groupID)
-            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, contextType, name, members, admins, threadID, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, type, name, members, admins, threadID, sentTimestamp)
         } else {
-            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, contextType, signalType, name, members, admins, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, type, name, members, admins, sentTimestamp)
         }
     }
 
@@ -191,9 +190,9 @@ object ClosedGroupsProtocolV2 {
         groupDB.updateMembers(groupID, newMembers.map { Address.fromSerialized(it) })
         if (userPublicKey == senderPublicKey) {
             val threadID = DatabaseFactory.getLokiThreadDatabase(context).getThreadID(groupID)
-            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, GroupContext.Type.UPDATE, name, members, admins, threadID, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, SignalServiceGroup.Type.UPDATE, name, members, admins, threadID, sentTimestamp)
         } else {
-            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, GroupContext.Type.UPDATE, SignalServiceGroup.Type.UPDATE, name, members, admins, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, SignalServiceGroup.Type.UPDATE, name, members, admins, sentTimestamp)
         }
         if (userPublicKey in admins) {
             // send current encryption key to the latest added members
@@ -230,9 +229,9 @@ object ClosedGroupsProtocolV2 {
         // Notify the user
         if (userPublicKey == senderPublicKey) {
             val threadID = DatabaseFactory.getLokiThreadDatabase(context).getThreadID(groupID)
-            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, GroupContext.Type.UPDATE, name, members, admins, threadID, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, SignalServiceGroup.Type.UPDATE, name, members, admins, threadID, sentTimestamp)
         } else {
-            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, GroupContext.Type.UPDATE, SignalServiceGroup.Type.UPDATE, name, members, admins, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, SignalServiceGroup.Type.UPDATE, name, members, admins, sentTimestamp)
         }
     }
 
@@ -272,9 +271,9 @@ object ClosedGroupsProtocolV2 {
         // Notify user
         if (userLeft) {
             val threadID = DatabaseFactory.getLokiThreadDatabase(context).getThreadID(groupID)
-            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, GroupContext.Type.QUIT, name, members, admins, threadID, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, SignalServiceGroup.Type.QUIT, name, members, admins, threadID, sentTimestamp)
         } else {
-            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, GroupContext.Type.QUIT, SignalServiceGroup.Type.QUIT, name, members, admins, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, SignalServiceGroup.Type.QUIT, name, members, admins, sentTimestamp)
         }
     }
 
@@ -385,14 +384,13 @@ object ClosedGroupsProtocolV2 {
         }
         // Notify the user
         val wasSenderRemoved = !members.contains(senderPublicKey)
-        val type0 = if (wasSenderRemoved) GroupContext.Type.QUIT else GroupContext.Type.UPDATE
+        val type = if (wasSenderRemoved) SignalServiceGroup.Type.QUIT else SignalServiceGroup.Type.UPDATE
-        val type1 = if (wasSenderRemoved) SignalServiceGroup.Type.QUIT else SignalServiceGroup.Type.UPDATE
         val admins = group.admins.map { it.toString() }
         if (userPublicKey == senderPublicKey) {
             val threadID = DatabaseFactory.getLokiThreadDatabase(context).getThreadID(groupID)
-            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, type0, name, members, admins, threadID, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertOutgoingInfoMessage(context, groupID, type, name, members, admins, threadID, sentTimestamp)
         } else {
-            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, type0, type1, name, members, admins, sentTimestamp)
+            DatabaseFactory.getStorage(context).insertIncomingInfoMessage(context, senderPublicKey, groupID, type, name, members, admins, sentTimestamp)
         }
     }
     // endregion

app/src/main/java/org/thoughtcrime/securesms/loki/utilities/GroupDescription.kt

@@ -1,103 +0,0 @@
-package org.thoughtcrime.securesms.loki.utilities
-
-import android.content.Context
-import org.session.libsession.messaging.threads.Address
-import org.session.libsession.messaging.threads.recipients.Recipient
-import org.session.libsession.messaging.threads.recipients.RecipientModifiedListener
-import org.session.libsession.utilities.TextSecurePreferences
-import org.session.libsignal.utilities.Base64
-import org.session.libsignal.service.internal.push.SignalServiceProtos
-import java.util.*
-
-import network.loki.messenger.R
-import org.session.libsignal.utilities.logging.Log
-import java.io.IOException
-
-class GroupDescription(context: Context, groupContext: SignalServiceProtos.GroupContext?) {
-    private val context: Context
-    private val groupContext: SignalServiceProtos.GroupContext?
-    private val newMembers: MutableList<Recipient>
-    private val removedMembers: MutableList<Recipient>
-    private var wasCurrentUserRemoved: Boolean = false
-    private fun toRecipient(hexEncodedPublicKey: String): Recipient {
-        val address = Address.fromSerialized(hexEncodedPublicKey)
-        return Recipient.from(context, address, false)
-    }
-
-    fun toString(sender: Recipient): String {
-        if (wasCurrentUserRemoved) {
-            return context.getString(R.string.GroupUtil_you_were_removed_from_group)
-        }
-        val description = StringBuilder()
-        description.append(context.getString(R.string.MessageRecord_s_updated_group, sender.toShortString()))
-        if (groupContext == null) {
-            return description.toString()
-        }
-        val title = groupContext.name
-        if (!newMembers.isEmpty()) {
-            description.append("\n")
-            description.append(context.resources.getQuantityString(R.plurals.GroupUtil_joined_the_group,
-                    newMembers.size, toString(newMembers)))
-        }
-        if (!removedMembers.isEmpty()) {
-            description.append("\n")
-            description.append(context.resources.getQuantityString(R.plurals.GroupUtil_removed_from_the_group,
-                    removedMembers.size, toString(removedMembers)))
-        }
-        if (title != null && !title.trim { it <= ' ' }.isEmpty()) {
-            val separator = if (!newMembers.isEmpty() || !removedMembers.isEmpty()) " " else "\n"
-            description.append(separator)
-            description.append(context.getString(R.string.GroupUtil_group_name_is_now, title))
-        }
-        return description.toString()
-    }
-
-    fun addListener(listener: RecipientModifiedListener?) {
-        if (!newMembers.isEmpty()) {
-            for (member in newMembers) {
-                member.addListener(listener)
-            }
-        }
-    }
-
-    private fun toString(recipients: List<Recipient>): String {
-        var result = ""
-        for (i in recipients.indices) {
-            result += recipients[i].toShortString()
-            if (i != recipients.size - 1) result += ", "
-        }
-        return result
-    }
-
-    init {
-        this.context = context.applicationContext
-        this.groupContext = groupContext
-        newMembers = LinkedList()
-        removedMembers = LinkedList()
-        if (groupContext != null) {
-            val newMembers = groupContext.newMembersList
-            for (member in newMembers) {
-                this.newMembers.add(toRecipient(member))
-            }
-            val removedMembers = groupContext.removedMembersList
-            for (member in removedMembers) {
-                this.removedMembers.add(toRecipient(member))
-            }
-            wasCurrentUserRemoved = removedMembers.contains(TextSecurePreferences.getLocalNumber(context))
-        }
-    }
-
-    companion object {
-        fun getDescription(context: Context, encodedGroup: String?): GroupDescription {
-            return if (encodedGroup == null) {
-                GroupDescription(context, null)
-            } else try {
-                val groupContext = SignalServiceProtos.GroupContext.parseFrom(Base64.decode(encodedGroup))
-                GroupDescription(context, groupContext)
-            } catch (e: IOException) {
-                Log.w("Loki", e)
-                GroupDescription(context, null)
-            }
-        }
-    }
-}

app/src/main/java/org/thoughtcrime/securesms/service/ExpiringMessageManager.java

@@ -2,22 +2,17 @@ package org.thoughtcrime.securesms.service;
 
 import android.content.Context;
 
-import com.google.protobuf.ByteString;
 
 import org.jetbrains.annotations.NotNull;
 import org.session.libsession.messaging.messages.control.ExpirationTimerUpdate;
-import org.session.libsession.messaging.messages.signal.OutgoingGroupMediaMessage;
+import org.session.libsession.messaging.messages.signal.OutgoingExpirationUpdateMessage;
-import org.session.libsession.messaging.messages.signal.OutgoingMediaMessage;
 import org.session.libsession.messaging.threads.Address;
-import org.session.libsession.messaging.threads.DistributionTypes;
 import org.session.libsession.messaging.threads.recipients.Recipient;
 import org.session.libsession.utilities.GroupUtil;
 import org.session.libsession.utilities.SSKEnvironment;
 import org.session.libsession.utilities.TextSecurePreferences;
 import org.session.libsignal.libsignal.util.guava.Optional;
 import org.session.libsignal.service.api.messages.SignalServiceGroup;
-import org.session.libsignal.service.internal.push.SignalServiceProtos;
-import org.session.libsignal.service.internal.push.SignalServiceProtos.GroupContext;
 import org.session.libsignal.utilities.logging.Log;
 
 import org.thoughtcrime.securesms.database.DatabaseFactory;
@@ -28,7 +23,6 @@ import org.session.libsession.messaging.messages.signal.IncomingMediaMessage;
 import org.thoughtcrime.securesms.mms.MmsException;
 
 import java.io.IOException;
-import java.util.Collections;
 import java.util.Comparator;
 import java.util.TreeSet;
 import java.util.concurrent.Executor;
@@ -79,8 +73,8 @@ public class ExpiringMessageManager implements SSKEnvironment.MessageExpirationM
     String senderPublicKey = message.getSender();
 
     // Notify the user
-    if (userPublicKey.equals(senderPublicKey)) {
+    if (senderPublicKey == null || userPublicKey.equals(senderPublicKey)) {
-      // sender is a linked device
+      // sender is self or a linked device
       insertOutgoingExpirationTimerMessage(message);
     } else {
       insertIncomingExpirationTimerMessage(message);
@@ -100,7 +94,7 @@ public class ExpiringMessageManager implements SSKEnvironment.MessageExpirationM
     int duration = message.getDuration();
 
     Optional<SignalServiceGroup> groupInfo = Optional.absent();
-    Address address = Address.fromSerialized((message.getSyncTarget() != null && !message.getSyncTarget().isEmpty()) ? message.getSyncTarget() : senderPublicKey);
+    Address address = Address.fromSerialized(senderPublicKey);
     Recipient recipient = Recipient.from(context, address, false);
 
     // if the sender is blocked, we don't display the update, except if it's in a closed group
@@ -139,41 +133,21 @@ public class ExpiringMessageManager implements SSKEnvironment.MessageExpirationM
   private void insertOutgoingExpirationTimerMessage(ExpirationTimerUpdate message) {
     MmsDatabase database = DatabaseFactory.getMmsDatabase(context);
 
-    String senderPublicKey = message.getSender();
     Long sentTimestamp = message.getSentTimestamp();
     String groupId = message.getGroupPublicKey();
     int duration = message.getDuration();
 
-    Address address = Address.fromSerialized((message.getSyncTarget() != null && !message.getSyncTarget().isEmpty()) ? message.getSyncTarget() : senderPublicKey);
+    Address address = Address.fromSerialized((message.getSyncTarget() != null && !message.getSyncTarget().isEmpty()) ? message.getSyncTarget() : message.getRecipient());
     Recipient recipient = Recipient.from(context, address, false);
 
     try {
+      OutgoingExpirationUpdateMessage timerUpdateMessage = new OutgoingExpirationUpdateMessage(recipient, sentTimestamp, duration * 1000L, groupId);
+      database.insertSecureDecryptedMessageOutbox(timerUpdateMessage, -1, sentTimestamp);
+
       if (groupId != null) {
-        // conversation is a closed group
-        GroupContext groupContext = SignalServiceProtos.GroupContext.newBuilder()
-                .setId(ByteString.copyFrom(GroupUtil.getDecodedGroupIDAsData(groupId))).build();
-        OutgoingGroupMediaMessage infoMessage = new OutgoingGroupMediaMessage(recipient, groupContext, null, sentTimestamp, duration * 1000L, true, null, Collections.emptyList(), Collections.emptyList());
-        database.insertSecureDecryptedMessageOutbox(infoMessage, -1, sentTimestamp);
         // we need the group ID as recipient for setExpireMessages below
         recipient = Recipient.from(context, Address.fromSerialized(GroupUtil.doubleEncodeGroupID(groupId)), false);
-      } else {
-        // conversation is a 1-1
-        OutgoingMediaMessage mediaMessage = new OutgoingMediaMessage(recipient,
-                null,
-                Collections.emptyList(),
-                message.getSentTimestamp(),
-                -1,
-                duration * 1000L,
-                true,
-                DistributionTypes.DEFAULT,
-                null,
-                Collections.emptyList(),
-                Collections.emptyList(),
-                Collections.emptyList(),
-                Collections.emptyList());
-        database.insertSecureDecryptedMessageOutbox(mediaMessage, -1, sentTimestamp);
       }
-
       //set the timer to the conversation
       DatabaseFactory.getRecipientDatabase(context).setExpireMessages(recipient, duration);
 

app/src/main/res/values-fr/strings.xml

@@ -418,6 +418,16 @@
   <string name="MessageRecord_message_encrypted_with_a_legacy_protocol_version_that_is_no_longer_supported">Vous avez reçu un message chiffré avec une ancienne version de Signal qui n’est plus prise en charge. Veuillez demander à l’expéditeur de mettre Session à jour vers la version la plus récente et de renvoyer son message.</string>
   <string name="MessageRecord_left_group">Vous avez quitté le groupe</string>
   <string name="MessageRecord_you_updated_group">Vous avez mis le groupe à jour.</string>
+  <string name="MessageRecord_you_created_a_new_group">Vous avez créée un nouveau groupe.</string>
+  <string name="MessageRecord_s_added_you_to_the_group">%1$s vous a ajouté au groupe.</string>
+  <string name="MessageRecord_you_renamed_the_group_to_s">Vous avez renommé le groupe en \'%1$s\'</string>
+  <string name="MessageRecord_s_renamed_the_group_to_s">%1$s a renommé le groupe en \'%2$s\'</string>
+  <string name="MessageRecord_you_added_s_to_the_group">Vous avez ajouté %1$s au groupe.</string>
+  <string name="MessageRecord_s_added_s_to_the_group">%1$s a ajouté %2$s au groupe.</string>
+  <string name="MessageRecord_you_removed_s_from_the_group">Vous avez supprimé %1$s du groupe.</string>
+  <string name="MessageRecord_s_removed_s_from_the_group">%1$s a supprimé %2$s du groupe.</string>
+  <string name="MessageRecord_you_were_removed_from_the_group">Vous avez été supprimé du groupe.</string>
+  <string name="MessageRecord_you">Vous</string>
   <string name="MessageRecord_you_called">Vous avez appelé</string>
   <string name="MessageRecord_called_you">Contact appelé</string>
   <string name="MessageRecord_missed_call">Appel manqué</string>
@@ -1483,4 +1493,35 @@ Vous avez reçu un message d’échange de clés pour une version de protocole i
   <string name="fragment_contact_selection_closed_groups_title">Groupes privés</string>
   <string name="fragment_contact_selection_open_groups_title">Groupes publics</string>
 
+  <!-- Next round of translation -->
+
+  <string name="menu_apply_button">Appliquer</string>
+  <string name="menu_done_button">Terminé</string>
+
+  <string name="activity_edit_closed_group_title">Modifier le groupe</string>
+  <string name="activity_edit_closed_group_edit_text_hint">Saisissez un nouveau nom de groupe</string>
+  <string name="activity_edit_closed_group_edit_members">Membres</string>
+  <string name="activity_edit_closed_group_add_members">Ajouter des membres</string>
+  <string name="activity_edit_closed_group_group_name_missing_error">Le nom du groupe ne peut pas être vide</string>
+  <string name="activity_edit_closed_group_group_name_too_long_error">Veuillez saisir un nom plus court</string>
+  <string name="activity_edit_closed_group_not_enough_group_members_error">Les groupes doivent avoir au moins un membre</string>
+  <string name="activity_edit_closed_group_invalid_session_id_error">Un des membres du group a un Session ID invalide</string>
+  <string name="activity_edit_closed_group_confirm_removal">Êtes vous sûr de vouloir suprimer ce membre du groupe?</string>
+  <string name="activity_edit_closed_group_member_removed">Membre supprimé du groupe</string>
+
+  <string name="fragment_edit_group_bottom_sheet_remove">Supprimer le membre du groupe</string>
+
+  <string name="activity_select_contacts_title">Contacts</string>
+
+  <string name="dialog_ui_mode_title">Thème</string>
+  <string name="dialog_ui_mode_option_day">Jour</string>
+  <string name="dialog_ui_mode_option_night">Nuit</string>
+  <string name="dialog_ui_mode_option_system_default">Système</string>
+
+  <string name="activity_conversation_menu_copy_session_id">Copier le Session ID</string>
+
+  <string name="attachment">Pièce jointe</string>
+  <string name="attachment_type_voice_message">Message vocal</string>
+  <string name="details">Détails</string>
+
 </resources>

app/src/main/res/values/strings.xml

@@ -493,6 +493,16 @@
     <string name="MessageRecord_message_encrypted_with_a_legacy_protocol_version_that_is_no_longer_supported">Received a message encrypted using an old version of Session that is no longer supported. Please ask the sender to update to the most recent version and resend the message.</string>
     <string name="MessageRecord_left_group">You have left the group.</string>
     <string name="MessageRecord_you_updated_group">You updated the group.</string>
+    <string name="MessageRecord_you_created_a_new_group">You created a new group.</string>
+    <string name="MessageRecord_s_added_you_to_the_group">%1$s added you to the group.</string>
+    <string name="MessageRecord_you_renamed_the_group_to_s">You renamed the group to \'%1$s\'</string>
+    <string name="MessageRecord_s_renamed_the_group_to_s">%1$s renamed the group to \'%2$s\'</string>
+    <string name="MessageRecord_you_added_s_to_the_group">You added %1$s to the group.</string>
+    <string name="MessageRecord_s_added_s_to_the_group">%1$s added %2$s to the group.</string>
+    <string name="MessageRecord_you_removed_s_from_the_group">You removed %1$s from the group.</string>
+    <string name="MessageRecord_s_removed_s_from_the_group">%1$s removed %2$s from the group.</string>
+    <string name="MessageRecord_you_were_removed_from_the_group">You were removed from the group.</string>
+    <string name="MessageRecord_you">You</string>
     <string name="MessageRecord_you_called">You called</string>
     <string name="MessageRecord_called_you">Contact called</string>
     <string name="MessageRecord_missed_call">Missed call</string>

libsession/src/main/java/org/session/libsession/messaging/StorageProtocol.kt

@@ -35,6 +35,7 @@ interface StorageProtocol {
     fun setUserProfilePictureUrl(newProfilePicture: String)
 
     fun getProfileKeyForRecipient(recipientPublicKey: String): ByteArray?
+    fun getDisplayNameForRecipient(recipientPublicKey: String): String?
     fun setProfileKeyForRecipient(recipientPublicKey: String, profileKey: ByteArray)
 
     // Signal Protocol
@@ -117,9 +118,9 @@ interface StorageProtocol {
     fun removeClosedGroupPublicKey(groupPublicKey: String)
     fun addClosedGroupEncryptionKeyPair(encryptionKeyPair: ECKeyPair, groupPublicKey: String)
     fun removeAllClosedGroupEncryptionKeyPairs(groupPublicKey: String)
-    fun insertIncomingInfoMessage(context: Context, senderPublicKey: String, groupID: String, type0: SignalServiceProtos.GroupContext.Type, type1: SignalServiceGroup.Type,
+    fun insertIncomingInfoMessage(context: Context, senderPublicKey: String, groupID: String, type: SignalServiceGroup.Type,
                                   name: String, members: Collection<String>, admins: Collection<String>, sentTimestamp: Long)
-    fun insertOutgoingInfoMessage(context: Context, groupID: String, type: SignalServiceProtos.GroupContext.Type, name: String,
+    fun insertOutgoingInfoMessage(context: Context, groupID: String, type: SignalServiceGroup.Type, name: String,
                                   members: Collection<String>, admins: Collection<String>, threadID: Long, sentTimestamp: Long)
     fun isClosedGroup(publicKey: String): Boolean
     fun getClosedGroupEncryptionKeyPairs(groupPublicKey: String): MutableList<ECKeyPair>

libsession/src/main/java/org/session/libsession/messaging/messages/control/ExpirationTimerUpdate.kt

@@ -33,6 +33,11 @@ class ExpirationTimerUpdate() : ControlMessage() {
         this.duration = duration
     }
 
+    internal constructor(duration: Int) : this() {
+        this.syncTarget = null
+        this.duration = duration
+    }
+
     // validation
     override fun isValid(): Boolean {
         if (!super.isValid()) return false

libsession/src/main/java/org/session/libsession/messaging/messages/signal/IncomingGroupMessage.java

@@ -4,11 +4,13 @@ import static org.session.libsignal.service.internal.push.SignalServiceProtos.Gr
 
 public class IncomingGroupMessage extends IncomingTextMessage {
 
-  private final GroupContext groupContext;
+  private final String groupID;
+  private final boolean updateMessage;
 
-  public IncomingGroupMessage(IncomingTextMessage base, GroupContext groupContext, String body) {
+  public IncomingGroupMessage(IncomingTextMessage base, String groupID, String body, boolean updateMessage) {
     super(base, body);
-    this.groupContext = groupContext;
+    this.groupID = groupID;
+    this.updateMessage = updateMessage;
   }
 
     @Override
@@ -16,12 +18,6 @@ public class IncomingGroupMessage extends IncomingTextMessage {
     return true;
   }
 
-  public boolean isUpdate() {
+  public boolean isUpdateMessage() { return updateMessage; }
-    return groupContext.getType().getNumber() == GroupContext.Type.UPDATE_VALUE;
-  }
-
-  public boolean isQuit() {
-    return groupContext.getType().getNumber() == GroupContext.Type.QUIT_VALUE;
-  }
 
 }

libsession/src/main/java/org/session/libsession/messaging/messages/signal/OutgoingExpirationUpdateMessage.java

@@ -1,6 +1,5 @@
 package org.session.libsession.messaging.messages.signal;
 
-import org.session.libsession.messaging.messages.control.ExpirationTimerUpdate;
 import org.session.libsession.messaging.sending_receiving.attachments.Attachment;
 import org.session.libsession.messaging.threads.DistributionTypes;
 import org.session.libsession.messaging.threads.recipients.Recipient;
@@ -10,15 +9,13 @@ import java.util.LinkedList;
 
 public class OutgoingExpirationUpdateMessage extends OutgoingSecureMediaMessage {
 
-  public OutgoingExpirationUpdateMessage(Recipient recipient, long sentTimeMillis, long expiresIn) {
+  private final String groupId;
-    super(recipient, "", new LinkedList<Attachment>(), sentTimeMillis,
-          DistributionTypes.CONVERSATION, expiresIn, true, null, Collections.emptyList(),
-          Collections.emptyList());
-  }
 
-  public static OutgoingExpirationUpdateMessage from(ExpirationTimerUpdate message,
+  public OutgoingExpirationUpdateMessage(Recipient recipient,  long sentTimeMillis, long expiresIn, String groupId) {
-                                          Recipient recipient) {
+    super(recipient, "", new LinkedList<Attachment>(), sentTimeMillis,
-    return new OutgoingExpirationUpdateMessage(recipient, message.getSentTimestamp(), message.getDuration() * 1000);
+          DistributionTypes.CONVERSATION, expiresIn, null, Collections.emptyList(),
+          Collections.emptyList());
+    this.groupId = groupId;
   }
 
   @Override
@@ -26,4 +23,13 @@ public class OutgoingExpirationUpdateMessage extends OutgoingSecureMediaMessage
     return true;
   }
 
+  @Override
+  public boolean isGroup() {
+    return groupId != null;
+  }
+
+  public String getGroupId() {
+    return groupId;
+  }
+
 }

libsession/src/main/java/org/session/libsession/messaging/messages/signal/OutgoingGroupMediaMessage.java

@@ -19,56 +19,27 @@ import java.util.List;
 
 public class OutgoingGroupMediaMessage extends OutgoingSecureMediaMessage {
 
-  private final GroupContext group;
+  private final String groupID;
+  private final boolean isUpdateMessage;
 
   public OutgoingGroupMediaMessage(@NonNull Recipient recipient,
-                                   @NonNull String encodedGroupContext,
+                                   @NonNull String body,
-                                   @NonNull List<Attachment> avatar,
+                                   @Nullable String groupId,
-                                   long sentTimeMillis,
-                                   long expiresIn,
-                                   @Nullable QuoteModel quote,
-                                   @NonNull List<Contact> contacts,
-                                   @NonNull List<LinkPreview> previews)
-      throws IOException
-  {
-    super(recipient, encodedGroupContext, avatar, sentTimeMillis,
-          DistributionTypes.CONVERSATION, expiresIn, false, quote, contacts, previews);
-
-    this.group = GroupContext.parseFrom(Base64.decode(encodedGroupContext));
-  }
-
-  public OutgoingGroupMediaMessage(@NonNull Recipient recipient,
-                                   @NonNull GroupContext group,
-                                   @Nullable final Attachment avatar,
-                                   long expireIn,
-                                   @Nullable QuoteModel quote,
-                                   @NonNull List<Contact> contacts,
-                                   @NonNull List<LinkPreview> previews)
-  {
-    super(recipient, Base64.encodeBytes(group.toByteArray()),
-            new LinkedList<Attachment>() {{if (avatar != null) add(avatar);}},
-            System.currentTimeMillis(),
-            DistributionTypes.CONVERSATION, expireIn, false, quote, contacts, previews);
-
-    this.group = group;
-  }
-
-  public OutgoingGroupMediaMessage(@NonNull Recipient recipient,
-                                   @NonNull GroupContext group,
                                    @Nullable final Attachment avatar,
                                    long sentTime,
                                    long expireIn,
-                                   boolean expirationUpdate,
+                                   boolean updateMessage,
                                    @Nullable QuoteModel quote,
                                    @NonNull List<Contact> contacts,
                                    @NonNull List<LinkPreview> previews)
   {
-    super(recipient, Base64.encodeBytes(group.toByteArray()),
+    super(recipient, body,
           new LinkedList<Attachment>() {{if (avatar != null) add(avatar);}},
           sentTime,
-          DistributionTypes.CONVERSATION, expireIn, expirationUpdate, quote, contacts, previews);
+          DistributionTypes.CONVERSATION, expireIn, quote, contacts, previews);
 
-    this.group = group;
+    this.groupID = groupId;
+    this.isUpdateMessage = updateMessage;
   }
 
   @Override
@@ -76,15 +47,11 @@ public class OutgoingGroupMediaMessage extends OutgoingSecureMediaMessage {
     return true;
   }
 
-  public boolean isGroupUpdate() {
+  public String getGroupId() {
-    return group.getType().getNumber() == GroupContext.Type.UPDATE_VALUE;
+    return groupID;
   }
 
-  public boolean isGroupQuit() {
+  public boolean isUpdateMessage() {
-    return group.getType().getNumber() == GroupContext.Type.QUIT_VALUE;
+    return isUpdateMessage;
-  }
-
-  public GroupContext getGroupContext() {
-    return group;
   }
 }

libsession/src/main/java/org/session/libsession/messaging/messages/signal/OutgoingMediaMessage.java

@@ -26,7 +26,6 @@ public class OutgoingMediaMessage {
   private   final int                       distributionType;
   private   final int                       subscriptionId;
   private   final long                      expiresIn;
-  private   final boolean                   expirationUpdate;
   private   final QuoteModel                outgoingQuote;
 
   private   final List<NetworkFailure>      networkFailures       = new LinkedList<>();
@@ -37,7 +36,6 @@ public class OutgoingMediaMessage {
   public OutgoingMediaMessage(Recipient recipient, String message,
                               List<Attachment> attachments, long sentTimeMillis,
                               int subscriptionId, long expiresIn,
-                              boolean expirationUpdate,
                               int distributionType,
                               @Nullable QuoteModel outgoingQuote,
                               @NonNull List<Contact> contacts,
@@ -52,7 +50,6 @@ public class OutgoingMediaMessage {
     this.attachments           = attachments;
     this.subscriptionId        = subscriptionId;
     this.expiresIn             = expiresIn;
-    this.expirationUpdate      = expirationUpdate;
     this.outgoingQuote         = outgoingQuote;
 
     this.contacts.addAll(contacts);
@@ -69,7 +66,6 @@ public class OutgoingMediaMessage {
     this.sentTimeMillis      = that.sentTimeMillis;
     this.subscriptionId      = that.subscriptionId;
     this.expiresIn           = that.expiresIn;
-    this.expirationUpdate    = that.expirationUpdate;
     this.outgoingQuote       = that.outgoingQuote;
 
     this.identityKeyMismatches.addAll(that.identityKeyMismatches);
@@ -89,7 +85,7 @@ public class OutgoingMediaMessage {
       previews = Collections.singletonList(linkPreview);
     }
     return new OutgoingMediaMessage(recipient, message.getText(), attachments, message.getSentTimestamp(), -1,
-            recipient.getExpireMessages() * 1000, false, DistributionTypes.DEFAULT, outgoingQuote, Collections.emptyList(),
+            recipient.getExpireMessages() * 1000, DistributionTypes.DEFAULT, outgoingQuote, Collections.emptyList(),
             previews, Collections.emptyList(), Collections.emptyList());
   }
 
@@ -113,7 +109,7 @@ public class OutgoingMediaMessage {
     return false;
   }
 
-  public boolean isExpirationUpdate() { return expirationUpdate; }
+  public boolean isExpirationUpdate() { return false; }
 
   public long getSentTimeMillis() {
     return sentTimeMillis;

libsession/src/main/java/org/session/libsession/messaging/messages/signal/OutgoingSecureMediaMessage.java

@@ -19,12 +19,11 @@ public class OutgoingSecureMediaMessage extends OutgoingMediaMessage {
                                     long sentTimeMillis,
                                     int distributionType,
                                     long expiresIn,
-                                    boolean expirationUpdate,
                                     @Nullable QuoteModel quote,
                                     @NonNull List<Contact> contacts,
                                     @NonNull List<LinkPreview> previews)
   {
-    super(recipient, body, attachments, sentTimeMillis, -1, expiresIn, expirationUpdate, distributionType, quote, contacts, previews, Collections.emptyList(), Collections.emptyList());
+    super(recipient, body, attachments, sentTimeMillis, -1, expiresIn, distributionType, quote, contacts, previews, Collections.emptyList(), Collections.emptyList());
   }
 
   public OutgoingSecureMediaMessage(OutgoingMediaMessage base) {

libsession/src/main/java/org/session/libsession/messaging/sending_receiving/MessageReceiverHandler.kt

@@ -264,8 +264,15 @@ private fun handleNewClosedGroup(sender: String, sentTimestamp: Long, groupPubli
     } else {
         storage.createGroup(groupID, name, LinkedList(members.map { Address.fromSerialized(it) }),
                 null, null, LinkedList(admins.map { Address.fromSerialized(it) }), formationTimestamp)
+        val userPublicKey = TextSecurePreferences.getLocalNumber(context)
         // Notify the user
-        storage.insertIncomingInfoMessage(context, sender, groupID, SignalServiceProtos.GroupContext.Type.UPDATE, SignalServiceGroup.Type.UPDATE, name, members, admins, sentTimestamp)
+        if (userPublicKey == sender) {
+            // sender is a linked device
+            val threadID = storage.getOrCreateThreadIdFor(Address.fromSerialized(groupID))
+            storage.insertOutgoingInfoMessage(context, groupID, SignalServiceGroup.Type.CREATION, name, members, admins, threadID, sentTimestamp)
+        } else {
+            storage.insertIncomingInfoMessage(context, sender, groupID, SignalServiceGroup.Type.CREATION, name, members, admins, sentTimestamp)
+        }
     }
     storage.setProfileSharing(Address.fromSerialized(groupID), true)
     // Add the group to the user's set of public keys to poll for
@@ -325,9 +332,8 @@ private fun MessageReceiver.handleClosedGroupUpdated(message: ClosedGroupControl
     }
     // Notify the user
     val wasSenderRemoved = !members.contains(senderPublicKey)
-    val type0 = if (wasSenderRemoved) SignalServiceProtos.GroupContext.Type.QUIT else SignalServiceProtos.GroupContext.Type.UPDATE
+    val type = if (wasSenderRemoved) SignalServiceGroup.Type.QUIT else SignalServiceGroup.Type.MEMBER_REMOVED
-    val type1 = if (wasSenderRemoved) SignalServiceGroup.Type.QUIT else SignalServiceGroup.Type.UPDATE
+    storage.insertIncomingInfoMessage(context, senderPublicKey, groupID, type, name, members, group.admins.map { it.toString() }, message.sentTimestamp!!)
-    storage.insertIncomingInfoMessage(context, senderPublicKey, groupID, type0, type1, name, members, group.admins.map { it.toString() }, message.sentTimestamp!!)
 }
 
 private fun MessageReceiver.handleClosedGroupEncryptionKeyPair(message: ClosedGroupControlMessage) {
@@ -399,9 +405,9 @@ private fun MessageReceiver.handleClosedGroupNameChanged(message: ClosedGroupCon
     if (userPublicKey == senderPublicKey) {
         // sender is a linked device
         val threadID = storage.getOrCreateThreadIdFor(Address.fromSerialized(groupID))
-        storage.insertOutgoingInfoMessage(context, groupID, SignalServiceProtos.GroupContext.Type.UPDATE, name, members, admins, threadID, message.sentTimestamp!!)
+        storage.insertOutgoingInfoMessage(context, groupID, SignalServiceGroup.Type.NAME_CHANGE, name, members, admins, threadID, message.sentTimestamp!!)
     } else {
-        storage.insertIncomingInfoMessage(context, senderPublicKey, groupID, SignalServiceProtos.GroupContext.Type.UPDATE, SignalServiceGroup.Type.UPDATE, name, members, admins, message.sentTimestamp!!)
+        storage.insertIncomingInfoMessage(context, senderPublicKey, groupID, SignalServiceGroup.Type.NAME_CHANGE, name, members, admins, message.sentTimestamp!!)
     }
 }
 
@@ -434,9 +440,9 @@ private fun MessageReceiver.handleClosedGroupMembersAdded(message: ClosedGroupCo
     if (userPublicKey == senderPublicKey) {
         // sender is a linked device
         val threadID = storage.getOrCreateThreadIdFor(Address.fromSerialized(groupID))
-        storage.insertOutgoingInfoMessage(context, groupID, SignalServiceProtos.GroupContext.Type.UPDATE, name, members, admins, threadID, message.sentTimestamp!!)
+        storage.insertOutgoingInfoMessage(context, groupID, SignalServiceGroup.Type.MEMBER_ADDED, name, updateMembers, admins, threadID, message.sentTimestamp!!)
     } else {
-        storage.insertIncomingInfoMessage(context, senderPublicKey, groupID, SignalServiceProtos.GroupContext.Type.UPDATE, SignalServiceGroup.Type.UPDATE, name, members, admins, message.sentTimestamp!!)
+        storage.insertIncomingInfoMessage(context, senderPublicKey, groupID, SignalServiceGroup.Type.MEMBER_ADDED, name, updateMembers, admins, message.sentTimestamp!!)
     }
     if (userPublicKey in admins) {
         // send current encryption key to the latest added members
@@ -498,17 +504,16 @@ private fun MessageReceiver.handleClosedGroupMembersRemoved(message: ClosedGroup
             MessageSender.generateAndSendNewEncryptionKeyPair(groupPublicKey, newMembers)
         }
     }
-    val (contextType, signalType) =
+    val type = if (senderLeft) SignalServiceGroup.Type.QUIT
-            if (senderLeft) SignalServiceProtos.GroupContext.Type.QUIT to SignalServiceGroup.Type.QUIT
+            else SignalServiceGroup.Type.MEMBER_REMOVED
-            else SignalServiceProtos.GroupContext.Type.UPDATE to SignalServiceGroup.Type.UPDATE
 
     // Notify the user
     if (userPublicKey == senderPublicKey) {
         // sender is a linked device
         val threadID = storage.getOrCreateThreadIdFor(Address.fromSerialized(groupID))
-        storage.insertOutgoingInfoMessage(context, groupID, contextType, name, members, admins, threadID, message.sentTimestamp!!)
+        storage.insertOutgoingInfoMessage(context, groupID, type, name, updateMembers, admins, threadID, message.sentTimestamp!!)
     } else {
-        storage.insertIncomingInfoMessage(context, senderPublicKey, groupID, contextType, signalType, name, members, admins, message.sentTimestamp!!)
+        storage.insertIncomingInfoMessage(context, senderPublicKey, groupID, type, name, updateMembers, admins, message.sentTimestamp!!)
     }
 }
 
@@ -554,9 +559,9 @@ private fun MessageReceiver.handleClosedGroupMemberLeft(message: ClosedGroupCont
     if (userLeft) {
         //sender is a linked device
         val threadID = storage.getOrCreateThreadIdFor(Address.fromSerialized(groupID))
-        storage.insertOutgoingInfoMessage(context, groupID, SignalServiceProtos.GroupContext.Type.QUIT, name, members, admins, threadID, message.sentTimestamp!!)
+        storage.insertOutgoingInfoMessage(context, groupID, SignalServiceGroup.Type.QUIT, name, members, admins, threadID, message.sentTimestamp!!)
     } else {
-        storage.insertIncomingInfoMessage(context, senderPublicKey, groupID, SignalServiceProtos.GroupContext.Type.QUIT, SignalServiceGroup.Type.QUIT, name, members, admins, message.sentTimestamp!!)
+        storage.insertIncomingInfoMessage(context, senderPublicKey, groupID, SignalServiceGroup.Type.QUIT, name, members, admins, message.sentTimestamp!!)
     }
 }
 

libsession/src/main/java/org/session/libsession/messaging/sending_receiving/MessageSenderClosedGroup.kt

@@ -15,6 +15,7 @@ import org.session.libsession.utilities.TextSecurePreferences
 import org.session.libsignal.libsignal.ecc.Curve
 import org.session.libsignal.libsignal.ecc.ECKeyPair
 import org.session.libsignal.libsignal.util.guava.Optional
+import org.session.libsignal.service.api.messages.SignalServiceGroup
 import org.session.libsignal.service.internal.push.SignalServiceProtos
 import org.session.libsignal.service.loki.utilities.hexEncodedPublicKey
 import org.session.libsignal.service.loki.utilities.removing05PrefixIfNeeded
@@ -60,7 +61,7 @@ fun MessageSender.create(name: String, members: Collection<String>): Promise<Str
         storage.addClosedGroupEncryptionKeyPair(encryptionKeyPair, groupPublicKey)
         // Notify the user
         val threadID = storage.getOrCreateThreadIdFor(Address.fromSerialized(groupID))
-        storage.insertOutgoingInfoMessage(context, groupID, SignalServiceProtos.GroupContext.Type.UPDATE, name, members, admins, threadID, sentTime)
+        storage.insertOutgoingInfoMessage(context, groupID, SignalServiceGroup.Type.CREATION, name, members, admins, threadID, sentTime)
         // Notify the PN server
         PushNotificationAPI.performOperation(PushNotificationAPI.ClosedGroupOperation.Subscribe, groupPublicKey, userPublicKey)
         // Fulfill the promise
@@ -107,7 +108,7 @@ fun MessageSender.setName(groupPublicKey: String, newName: String) {
     // Update the group
     storage.updateTitle(groupID, newName)
     // Notify the user
-    val infoType = SignalServiceProtos.GroupContext.Type.UPDATE
+    val infoType = SignalServiceGroup.Type.NAME_CHANGE
     val threadID = storage.getOrCreateThreadIdFor(Address.fromSerialized(groupID))
     storage.insertOutgoingInfoMessage(context, groupID, infoType, newName, members, admins, threadID, sentTime)
 }
@@ -150,9 +151,9 @@ fun MessageSender.addMembers(groupPublicKey: String, membersToAdd: List<String>)
         send(closedGroupControlMessage, Address.fromSerialized(member))
     }
     // Notify the user
-    val infoType = SignalServiceProtos.GroupContext.Type.UPDATE
+    val infoType = SignalServiceGroup.Type.MEMBER_ADDED
     val threadID = storage.getOrCreateThreadIdFor(Address.fromSerialized(groupID))
-    storage.insertOutgoingInfoMessage(context, groupID, infoType, name, updatedMembers, admins, threadID, sentTime)
+    storage.insertOutgoingInfoMessage(context, groupID, infoType, name, membersToAdd, admins, threadID, sentTime)
 }
 
 fun MessageSender.removeMembers(groupPublicKey: String, membersToRemove: List<String>) {
@@ -189,9 +190,9 @@ fun MessageSender.removeMembers(groupPublicKey: String, membersToRemove: List<St
         generateAndSendNewEncryptionKeyPair(groupPublicKey, updatedMembers)
     }
     // Notify the user
-    val infoType = SignalServiceProtos.GroupContext.Type.UPDATE
+    val infoType = SignalServiceGroup.Type.MEMBER_REMOVED
     val threadID = storage.getOrCreateThreadIdFor(Address.fromSerialized(groupID))
-    storage.insertOutgoingInfoMessage(context, groupID, infoType, name, updatedMembers, admins, threadID, sentTime)
+    storage.insertOutgoingInfoMessage(context, groupID, infoType, name, membersToRemove, admins, threadID, sentTime)
 }
 
 fun MessageSender.leave(groupPublicKey: String, notifyUser: Boolean = true): Promise<Unit, Exception> {
@@ -212,7 +213,7 @@ fun MessageSender.leave(groupPublicKey: String, notifyUser: Boolean = true): Pro
         storage.setActive(groupID, false)
         sendNonDurably(closedGroupControlMessage, Address.fromSerialized(groupID)).success {
             // Notify the user
-            val infoType = SignalServiceProtos.GroupContext.Type.QUIT
+            val infoType = SignalServiceGroup.Type.QUIT
             val threadID = storage.getOrCreateThreadIdFor(Address.fromSerialized(groupID))
             if (notifyUser) {
                 storage.insertOutgoingInfoMessage(context, groupID, infoType, name, updatedMembers, admins, threadID, sentTime)

libsession/src/main/java/org/session/libsession/messaging/utilities/UpdateMessageBuilder.kt

@@ -0,0 +1,100 @@
+package org.session.libsession.messaging.utilities
+
+import android.content.Context
+import org.session.libsession.R
+import org.session.libsession.messaging.MessagingConfiguration
+import org.session.libsession.utilities.ExpirationUtil
+import org.session.libsignal.service.api.messages.SignalServiceGroup
+
+object UpdateMessageBuilder {
+
+    fun buildGroupUpdateMessage(context: Context, updateMessageData: UpdateMessageData, sender: String? = null, isOutgoing: Boolean = false): String {
+        var message: String = ""
+        val updateData = updateMessageData.kind as? UpdateMessageData.Kind.GroupUpdate ?: return message
+        val updateType = updateData.type
+        if (!isOutgoing && sender == null) return message
+        val senderName: String? = if (!isOutgoing) {
+            MessagingConfiguration.shared.storage.getDisplayNameForRecipient(sender!!) ?: sender
+        } else { context.getString(R.string.MessageRecord_you) }
+
+        when (updateType) {
+            SignalServiceGroup.Type.CREATION -> {
+                message = if (isOutgoing) {
+                    context.getString(R.string.MessageRecord_you_created_a_new_group)
+                } else {
+                    context.getString(R.string.MessageRecord_s_added_you_to_the_group, senderName)
+                }
+            }
+            SignalServiceGroup.Type.NAME_CHANGE -> {
+                message = if (isOutgoing) {
+                    context.getString(R.string.MessageRecord_you_renamed_the_group_to_s, updateData.groupName)
+                } else {
+                    context.getString(R.string.MessageRecord_s_renamed_the_group_to_s, senderName, updateData.groupName)
+                }
+            }
+            SignalServiceGroup.Type.MEMBER_ADDED -> {
+                val members = updateData.updatedMembers.joinToString(", ") {
+                    MessagingConfiguration.shared.storage.getDisplayNameForRecipient(it) ?: it
+                }
+                message = if (isOutgoing) {
+                    context.getString(R.string.MessageRecord_you_added_s_to_the_group, members)
+                } else {
+                    context.getString(R.string.MessageRecord_s_added_s_to_the_group, senderName, members)
+                }
+            }
+            SignalServiceGroup.Type.MEMBER_REMOVED -> {
+                val storage = MessagingConfiguration.shared.storage
+                val userPublicKey = storage.getUserPublicKey()!!
+                // 1st case: you are part of the removed members
+                message = if (userPublicKey in updateData.updatedMembers) {
+                    if (isOutgoing) {
+                        context.getString(R.string.MessageRecord_left_group)
+                    } else {
+                        context.getString(R.string.MessageRecord_you_were_removed_from_the_group)
+                    }
+                } else {
+                    // 2nd case: you are not part of the removed members
+                    val members = updateData.updatedMembers.joinToString(", ") {
+                        storage.getDisplayNameForRecipient(it) ?: it
+                    }
+                    if (isOutgoing) {
+                        context.getString(R.string.MessageRecord_you_removed_s_from_the_group, members)
+                    } else {
+                        context.getString(R.string.MessageRecord_s_removed_s_from_the_group, senderName, members)
+                    }
+                }
+            }
+            SignalServiceGroup.Type.QUIT -> {
+                message = if (isOutgoing) {
+                    context.getString(R.string.MessageRecord_left_group)
+                } else {
+                    context.getString(R.string.ConversationItem_group_action_left, senderName)
+                }
+            }
+            else -> {
+                message = context.getString(R.string.MessageRecord_s_updated_group, senderName)
+            }
+        }
+        return message
+    }
+
+    fun buildExpirationTimerMessage(context: Context, duration: Long, sender: String? = null, isOutgoing: Boolean = false): String {
+        if (!isOutgoing && sender == null) return ""
+        val senderName: String? = if (!isOutgoing) {
+            MessagingConfiguration.shared.storage.getDisplayNameForRecipient(sender!!) ?: sender
+        } else { sender }
+        return if (duration <= 0) {
+            if (isOutgoing) context.getString(R.string.MessageRecord_you_disabled_disappearing_messages)
+            else context.getString(R.string.MessageRecord_s_disabled_disappearing_messages, senderName)
+        } else {
+            val time = ExpirationUtil.getExpirationDisplayValue(context, duration.toInt())
+            if (isOutgoing)context.getString(R.string.MessageRecord_you_set_disappearing_message_time_to_s, time)
+            else context.getString(R.string.MessageRecord_s_set_disappearing_message_time_to_s, senderName, time)
+        }
+    }
+
+    //TODO do this when the current update is merged
+    fun buildDataExtractionMessage(): String {
+        return ""
+    }
+}

libsession/src/main/java/org/session/libsession/messaging/utilities/UpdateMessageData.kt

@@ -0,0 +1,56 @@
+package org.session.libsession.messaging.utilities
+
+import com.fasterxml.jackson.annotation.JsonSubTypes
+import com.fasterxml.jackson.annotation.JsonTypeInfo
+import com.fasterxml.jackson.core.JsonParseException
+import org.session.libsignal.service.api.messages.SignalServiceGroup
+import org.session.libsignal.utilities.JsonUtil
+import org.session.libsignal.utilities.logging.Log
+import java.util.*
+
+// class used to save update messages details
+class UpdateMessageData () {
+
+    var kind: Kind? = null
+
+    //the annotations below are required for serialization. Any new Kind class MUST be declared as JsonSubTypes as well
+    @JsonTypeInfo(use = JsonTypeInfo.Id.NAME)
+    @JsonSubTypes(
+            JsonSubTypes.Type(Kind.GroupUpdate::class, name = "GroupUpdate")
+    )
+    sealed class Kind {
+        class GroupUpdate( var type: SignalServiceGroup.Type, var groupName: String?, var updatedMembers: Collection<String>): Kind() {
+            constructor(): this(SignalServiceGroup.Type.UNKNOWN, null, Collections.emptyList()) //default constructor required for json serialization
+        }
+    }
+
+    constructor(kind: Kind): this() {
+        this.kind = kind
+    }
+
+    companion object {
+        val TAG = UpdateMessageData::class.simpleName
+
+        fun buildGroupUpdate(type: SignalServiceGroup.Type, name: String, members: Collection<String>): UpdateMessageData {
+            return when(type) {
+                SignalServiceGroup.Type.NAME_CHANGE -> UpdateMessageData(Kind.GroupUpdate(type, name, Collections.emptyList()))
+                SignalServiceGroup.Type.MEMBER_ADDED -> UpdateMessageData(Kind.GroupUpdate(type,null, members))
+                SignalServiceGroup.Type.MEMBER_REMOVED -> UpdateMessageData(Kind.GroupUpdate(type,null, members))
+                else -> UpdateMessageData(Kind.GroupUpdate(type,null, Collections.emptyList()))
+            }
+        }
+
+        fun fromJSON(json: String): UpdateMessageData {
+             return try {
+                JsonUtil.fromJson(json, UpdateMessageData::class.java)
+            } catch (e: JsonParseException) {
+                Log.e(TAG, "${e.message}")
+                UpdateMessageData(Kind.GroupUpdate(SignalServiceGroup.Type.UNKNOWN, null, Collections.emptyList()))
+            }
+        }
+    }
+
+    fun toJSON(): String {
+        return JsonUtil.toJson(this)
+    }
+}

libsession/src/main/res/values/strings.xml

@@ -487,6 +487,16 @@
     <string name="MessageRecord_message_encrypted_with_a_legacy_protocol_version_that_is_no_longer_supported">Received a message encrypted using an old version of Session that is no longer supported. Please ask the sender to update to the most recent version and resend the message.</string>
     <string name="MessageRecord_left_group">You have left the group.</string>
     <string name="MessageRecord_you_updated_group">You updated the group.</string>
+    <string name="MessageRecord_you_created_a_new_group">You created a new group.</string>
+    <string name="MessageRecord_s_added_you_to_the_group">%1$s added you to the group.</string>
+    <string name="MessageRecord_you_renamed_the_group_to_s">You renamed the group to %1$s</string>
+    <string name="MessageRecord_s_renamed_the_group_to_s">%1$s renamed the group to: %2$s</string>
+    <string name="MessageRecord_you_added_s_to_the_group">You added %1$s to the group.</string>
+    <string name="MessageRecord_s_added_s_to_the_group">%1$s added %2$s to the group.</string>
+    <string name="MessageRecord_you_removed_s_from_the_group">You removed %1$s from the group.</string>
+    <string name="MessageRecord_s_removed_s_from_the_group">%1$s removed %2$s from the group.</string>
+    <string name="MessageRecord_you_were_removed_from_the_group">You were removed from the group.</string>
+    <string name="MessageRecord_you">You</string>
     <string name="MessageRecord_you_called">You called</string>
     <string name="MessageRecord_called_you">Contact called</string>
     <string name="MessageRecord_missed_call">Missed call</string>

libsignal/src/main/java/org/session/libsignal/service/api/messages/SignalServiceGroup.java

@@ -37,7 +37,11 @@ public class SignalServiceGroup {
     UPDATE,
     DELIVER,
     QUIT,
-    REQUEST_INFO
+    REQUEST_INFO,
+    CREATION,
+    NAME_CHANGE,
+    MEMBER_ADDED,
+    MEMBER_REMOVED
   }
 
   private final byte[]                            groupId;