Add invite friends action button and text.

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

@@ -233,6 +233,15 @@ public final class ConversationUpdateItem extends LinearLayout
         actionButton.setVisibility(GONE);
         actionButton.setOnClickListener(null);
       }
+    } else if (conversationMessage.getMessageRecord().isSelfCreatedGroup()) {
+      actionButton.setText(R.string.ConversationUpdateItem_invite_friends);
+      actionButton.setVisibility(VISIBLE);
+      actionButton.setOnClickListener(v -> {
+        if (batchSelected.isEmpty() && eventListener != null) {
+          // TODO [alan]
+          Log.i(TAG, "TODO");
+        }
+      });
     } else {
       actionButton.setVisibility(GONE);
       actionButton.setOnClickListener(null);

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

@@ -32,6 +32,7 @@ import com.annimon.stream.Stream;
 
 import org.signal.core.util.logging.Log;
 import org.signal.storageservice.protos.groups.local.DecryptedGroup;
+import org.signal.storageservice.protos.groups.local.DecryptedGroupChange;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.database.MmsSmsColumns;
 import org.thoughtcrime.securesms.database.SmsDatabase;
@@ -56,6 +57,7 @@ import org.whispersystems.signalservice.api.util.UuidUtil;
 
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
@@ -194,6 +196,26 @@ public abstract class MessageRecord extends DisplayRecord {
     return null;
   }
 
+  public boolean isSelfCreatedGroup() {
+    if (!isGroupUpdate() || !isGroupV2()) return false;
+
+    try {
+      byte[]               decoded = Base64.decode(getBody());
+      DecryptedGroupChange change  = DecryptedGroupV2Context.parseFrom(decoded)
+                                                               .getChange();
+
+      return selfCreatedGroup(change);
+    } catch (IOException e) {
+      Log.w(TAG, "GV2 Message update detail could not be read", e);
+      return false;
+    }
+  }
+
+  private static boolean selfCreatedGroup(@NonNull DecryptedGroupChange change) {
+    return change.getRevision() == 0 &&
+           change.getEditor().equals(UuidUtil.toByteString(Recipient.self().requireUuid()));
+  }
+
   public static @NonNull UpdateDescription getGv2ChangeDescription(@NonNull Context context, @NonNull String body) {
     try {
       ShortStringDescriptionStrategy descriptionStrategy     = new ShortStringDescriptionStrategy(context);
@@ -203,6 +225,9 @@ public abstract class MessageRecord extends DisplayRecord {
 
       if (decryptedGroupV2Context.hasChange() && (decryptedGroupV2Context.getGroupState().getRevision() != 0 || decryptedGroupV2Context.hasPreviousGroupState())) {
         return UpdateDescription.concatWithNewLines(updateMessageProducer.describeChanges(decryptedGroupV2Context.getPreviousGroupState(), decryptedGroupV2Context.getChange()));
+      } else if (selfCreatedGroup(decryptedGroupV2Context.getChange())) {
+        return UpdateDescription.concatWithNewLines(Arrays.asList(updateMessageProducer.describeNewGroup(decryptedGroupV2Context.getGroupState(), decryptedGroupV2Context.getChange()),
+                                                                  staticUpdateDescription(context.getString(R.string.MessageRecord_invite_friends_to_this_group), 0)));
       } else {
         return updateMessageProducer.describeNewGroup(decryptedGroupV2Context.getGroupState(), decryptedGroupV2Context.getChange());
       }

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

@@ -1081,6 +1081,7 @@
     <!-- GV2 specific -->
     <string name="MessageRecord_you_created_the_group">You created the group.</string>
     <string name="MessageRecord_group_updated">Group updated.</string>
+    <string name="MessageRecord_invite_friends_to_this_group">Invite friends to this group via a group link</string>
 
     <!-- GV2 member additions -->
     <string name="MessageRecord_you_added_s">You added %1$s.</string>
@@ -1954,6 +1955,7 @@
     <string name="ConversationUpdateItem_join_call">Join call</string>
     <string name="ConversationUpdateItem_return_to_call">Return to call</string>
     <string name="ConversationUpdateItem_call_is_full">Call is full</string>
+    <string name="ConversationUpdateItem_invite_friends">Invite friends</string>
 
     <!-- audio_view -->
     <string name="audio_view__play_pause_accessibility_description">Play … Pause</string>