Let user know when members have been removed from the group.

res/values/strings.xml

@@ -1073,7 +1073,12 @@
         <item quantity="one">%1$s joined the group.</item>
         <item quantity="other">%1$s joined the group.</item>
     </plurals>
+    <plurals name="GroupUtil_removed_from_the_group">
+        <item quantity="one">%1$s was removed from the group.</item>
+        <item quantity="other">%1$s were removed from the group.</item>
+    </plurals>
     <string name="GroupUtil_group_name_is_now">Group name is now \'%1$s\'.</string>
+    <string name="GroupUtil_you_were_removed_from_group">You were removed from the group.</string>
 
     <!-- profile_group_share_view -->
     <string name="profile_group_share_view__make_your_profile_name_and_photo_visible_to_this_group">Make your profile name and photo visible to this group?</string>

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

@@ -175,7 +175,7 @@ public class ConversationUpdateItem extends LinearLayout
     icon.setImageResource(R.drawable.ic_group_grey600_24dp);
     icon.clearColorFilter();
 
-    GroupUtil.getDescription(getContext(), messageRecord.getBody()).addListener(this);
+    GroupUtil.getDescription(getContext(), messageRecord.getBody(), messageRecord.getRecipient()).addListener(this);
     body.setText(messageRecord.getDisplayBody(getContext()));
 
     title.setVisibility(GONE);

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

@@ -92,7 +92,7 @@ public abstract class MessageRecord extends DisplayRecord {
     if (isGroupUpdate() && isOutgoing()) {
       return new SpannableString(context.getString(R.string.MessageRecord_you_updated_group));
     } else if (isGroupUpdate()) {
-      return new SpannableString(GroupUtil.getDescription(context, getBody()).toString(getIndividualRecipient()));
+      return new SpannableString(GroupUtil.getDescription(context, getBody(), getRecipient()).toString(getIndividualRecipient()));
     } else if (isGroupQuit() && isOutgoing()) {
       return new SpannableString(context.getString(R.string.MessageRecord_left_group));
     } else if (isGroupQuit()) {

src/org/thoughtcrime/securesms/groups/GroupMessageProcessor.java

@@ -141,7 +141,9 @@ public class GroupMessageProcessor {
     }
 
     if (missingMembers.size() > 0) {
-      // TODO We should tell added and missing about each-other.
+      for (Address removedMember : missingMembers) {
+        builder.addMembers(removedMember.serialize());
+      }
     }
 
     if (group.getName().isPresent() || group.getAvatar().isPresent()) {

src/org/thoughtcrime/securesms/loki/LokiThreadDatabase.kt

@@ -45,6 +45,10 @@ class LokiThreadDatabase(context: Context, helper: SQLCipherOpenHelper) : Databa
     fun getFriendRequestStatus(threadID: Long): LokiThreadFriendRequestStatus {
         if (threadID < 0) { return LokiThreadFriendRequestStatus.NONE }
 
+        // Loki - Friend request logic doesn't apply to group chats, always treat them as friends
+        val recipient = DatabaseFactory.getThreadDatabase(context).getRecipientForThreadId(threadID)
+        if (recipient != null && recipient.isGroupRecipient) { return LokiThreadFriendRequestStatus.FRIENDS; }
+
         val database = databaseHelper.readableDatabase
         val result = database.get(friendRequestTableName, "${Companion.threadID} = ?", arrayOf( threadID.toString() )) { cursor ->
             cursor.getInt(friendRequestStatus)

src/org/thoughtcrime/securesms/util/GroupUtil.java

@@ -7,10 +7,13 @@ import android.support.annotation.WorkerThread;
 
 import com.google.protobuf.ByteString;
 
+import network.loki.messenger.BuildConfig;
 import network.loki.messenger.R;
 import org.thoughtcrime.securesms.database.Address;
+import org.thoughtcrime.securesms.database.Database;
 import org.thoughtcrime.securesms.database.DatabaseFactory;
 import org.thoughtcrime.securesms.database.GroupDatabase;
+import org.thoughtcrime.securesms.database.GroupDatabase.*;
 import org.thoughtcrime.securesms.logging.Log;
 import org.thoughtcrime.securesms.mms.OutgoingGroupMediaMessage;
 import org.thoughtcrime.securesms.recipients.Recipient;
@@ -111,17 +114,25 @@ public class GroupUtil {
   }
 
 
-  public static @NonNull GroupDescription getDescription(@NonNull Context context, @Nullable String encodedGroup) {
+  public static @NonNull GroupDescription getDescription(@NonNull Context context, @Nullable String encodedGroup, @Nullable Recipient groupRecipient) {
+    // Make sure we always are passing a group recipient
+    if (BuildConfig.DEBUG && groupRecipient != null && !groupRecipient.isGroupRecipient()) {
+      throw new AssertionError();
+    }
+
     if (encodedGroup == null) {
-      return new GroupDescription(context, null);
+      return new GroupDescription(context, null, null);
     }
 
     try {
-      GroupContext  groupContext = GroupContext.parseFrom(Base64.decode(encodedGroup));
-      return new GroupDescription(context, groupContext);
+      GroupContext groupContext = GroupContext.parseFrom(Base64.decode(encodedGroup));
+      GroupRecord groupRecord = groupRecipient != null
+              ? DatabaseFactory.getGroupDatabase(context).getGroup(groupRecipient.getAddress().toGroupString()).orNull()
+              : null;
+      return new GroupDescription(context, groupContext, groupRecord);
     } catch (IOException e) {
       Log.w(TAG, e);
-      return new GroupDescription(context, null);
+      return new GroupDescription(context, null, null);
     }
   }
 
@@ -129,24 +140,50 @@ public class GroupUtil {
 
     @NonNull  private final Context         context;
     @Nullable private final GroupContext    groupContext;
-    @Nullable private final List<Recipient> members;
+    private final List<Recipient> members;
+    private final List<Recipient> removedMembers;
+    private boolean ourDeviceWasRemoved;
 
-    public GroupDescription(@NonNull Context context, @Nullable GroupContext groupContext) {
+    public GroupDescription(@NonNull Context context, @Nullable GroupContext groupContext) { this(context, groupContext, null); }
+    public GroupDescription(@NonNull Context context, @Nullable GroupContext groupContext, @Nullable GroupRecord groupRecord) {
       this.context      = context.getApplicationContext();
       this.groupContext = groupContext;
 
-      if (groupContext == null || groupContext.getMembersList().isEmpty()) {
-        this.members = null;
-      } else {
-        this.members = new LinkedList<>();
+      this.members = new LinkedList<>();
+      this.removedMembers = new LinkedList<>();
+      this.ourDeviceWasRemoved = false;
+
+      if (groupContext != null && !groupContext.getMembersList().isEmpty()) {
+        List<String> memberList = groupContext.getMembersList();
+        List<Address> currentMembers = groupRecord != null ? groupRecord.getMembers() : null;
+
+        // Add them to the member or removed members lists
+        for (String member : memberList) {
+          Address address = Address.fromSerialized(member);
+          Recipient recipient = Recipient.from(context, address, true);
+          if (currentMembers == null || currentMembers.contains(address)) {
+            this.members.add(recipient);
+          } else {
+            this.removedMembers.add(recipient);
+          }
+        }
 
-        for (String member : groupContext.getMembersList()) {
-          this.members.add(Recipient.from(context, Address.fromExternal(context, member), true));
+        // Check if our device was removed
+        if (!removedMembers.isEmpty()) {
+          String masterHexEncodedPublicKey = TextSecurePreferences.getMasterHexEncodedPublicKey(context);
+          String hexEncodedPublicKey = masterHexEncodedPublicKey != null ? masterHexEncodedPublicKey : TextSecurePreferences.getLocalNumber(context);
+          Recipient self = Recipient.from(context, Address.fromSerialized(hexEncodedPublicKey), false);
+          ourDeviceWasRemoved = removedMembers.contains(self);
         }
       }
     }
 
     public String toString(Recipient sender) {
+      // Show the local removed message
+      if (ourDeviceWasRemoved) {
+          return context.getString(R.string.GroupUtil_you_were_removed_from_group);
+      }
+
       StringBuilder description = new StringBuilder();
       description.append(context.getString(R.string.MessageRecord_s_updated_group, sender.toShortString()));
 
@@ -156,14 +193,20 @@ public class GroupUtil {
 
       String title = groupContext.getName();
 
-      if (members != null) {
+      if (!members.isEmpty()) {
         description.append("\n");
         description.append(context.getResources().getQuantityString(R.plurals.GroupUtil_joined_the_group,
                                                                     members.size(), toString(members)));
       }
 
+      if (!removedMembers.isEmpty()) {
+        description.append("\n");
+        description.append(context.getResources().getQuantityString(R.plurals.GroupUtil_removed_from_the_group,
+                removedMembers.size(), toString(removedMembers)));
+      }
+
       if (title != null && !title.trim().isEmpty()) {
-        if (members != null) description.append(" ");
+        if (!members.isEmpty()) description.append(" ");
         else                 description.append("\n");
         description.append(context.getString(R.string.GroupUtil_group_name_is_now, title));
       }
@@ -172,7 +215,7 @@ public class GroupUtil {
     }
 
     public void addListener(RecipientModifiedListener listener) {
-      if (this.members != null) {
+      if (!this.members.isEmpty()) {
         for (Recipient member : this.members) {
           member.addListener(listener);
         }