Ignore Group Messages

This CL drops messages that have multiple recipients. This is a
risk mitigation change in case Bluetooth MMS/RCS support is added
later on this branch. If the Bluetooth change is added, 1-1 RCS
and non-Group MMS messages will still be supported by Messenger.

Bug: 145803615
Test: to test on hawk, verify no breakages.
Change-Id: Ie3e0dc99ffac33b355c5ffdca8bf091b56da2f73

2 files changed, 11 insertions, 1 deletions

diff --git a/src/com/android/car/messenger/MapMessage.java b/src/com/android/car/messenger/MapMessage.java
index c7e91e6..86bc543 100644
--- a/src/com/android/car/messenger/MapMessage.java
+++ b/src/com/android/car/messenger/MapMessage.java
@@ -19,6 +19,7 @@ package com.android.car.messenger;
 import android.bluetooth.BluetoothDevice;
 import android.bluetooth.BluetoothMapClient;
 import android.content.Intent;
+import com.android.car.messenger.log.L;
 
 import androidx.annotation.Nullable;
 
@@ -26,6 +27,7 @@ import androidx.annotation.Nullable;
  * Represents a message obtained via MAP service from a connected Bluetooth device.
  */
 class MapMessage {
+    private static final String TAG = "CM.MapMessage";
     private String mDeviceAddress;
     private String mHandle;
     private String mSenderName;
@@ -41,11 +43,18 @@ class MapMessage {
      * {@link BluetoothMapClient#ACTION_MESSAGE_RECEIVED} broadcast.
      *
      * @param intent intent received from MAP service
-     * @return message constructed from extras in {@code intent}
+     * @return message constructed from extras in {@code intent}, or null if this is a group
+     *         conversation.
      * @throws NullPointerException if {@code intent} is missing the device extra
      * @throws IllegalArgumentException if {@code intent} is missing any other required extras
      */
+    @Nullable
     public static MapMessage parseFrom(Intent intent) {
+        if (intent.getStringArrayExtra(Intent.EXTRA_CC) != null
+            && intent.getStringArrayExtra(Intent.EXTRA_CC).length > 0) {
+            L.i(TAG, "Skipping group conversation message");
+            return null;
+        }
         BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
         String handle = intent.getStringExtra(BluetoothMapClient.EXTRA_MESSAGE_HANDLE);
         String senderUri = intent.getStringExtra(BluetoothMapClient.EXTRA_SENDER_CONTACT_URI);
diff --git a/src/com/android/car/messenger/MessengerDelegate.java b/src/com/android/car/messenger/MessengerDelegate.java
index 8fb77d7..137aaad 100644
--- a/src/com/android/car/messenger/MessengerDelegate.java
+++ b/src/com/android/car/messenger/MessengerDelegate.java
@@ -93,6 +93,7 @@ public class MessengerDelegate implements BluetoothMonitor.OnBluetoothEventListe
     public void onMessageReceived(Intent intent) {
         try {
             MapMessage message = MapMessage.parseFrom(intent);
+            if (message == null) return;
             L.d(TAG, "Received message from " + message.getDeviceAddress());
 
             MessageKey messageKey = new MessageKey(message);