Display a notification when unable retrieve messages for push

Fixes #6684
// FREEBIE

res/values/strings.xml

@@ -670,6 +670,8 @@
     <string name="MessageNotifier_mark_read">Mark read</string>
     <string name="MessageNotifier_media_message">Media message</string>
     <string name="MessageNotifier_reply">Reply</string>
+    <string name="MessageNotifier_pending_signal_messages">Pending Signal messages</string>
+    <string name="MessageNotifier_you_have_pending_signal_messages">You have pending Signal messages, tap to open and retrieve</string>
 
     <!-- MmsPreferencesFragment -->
     <string name="MmsPreferencesFragment__manual_mms_settings_are_required">Manual MMS settings are required for your phone.</string>

src/org/thoughtcrime/securesms/jobs/PushNotificationReceiveJob.java

@@ -4,6 +4,7 @@ import android.content.Context;
 import android.util.Log;
 
 import org.thoughtcrime.securesms.dependencies.InjectableType;
+import org.thoughtcrime.securesms.notifications.MessageNotifier;
 import org.whispersystems.jobqueue.JobParameters;
 import org.whispersystems.jobqueue.requirements.NetworkRequirement;
 import org.whispersystems.signalservice.api.SignalServiceMessageReceiver;
@@ -50,5 +51,6 @@ public class PushNotificationReceiveJob extends PushReceivedJob implements Injec
   @Override
   public void onCanceled() {
     Log.w(TAG, "***** Failed to download pending message!");
+    MessageNotifier.notifyMessagesPending(getContext());
   }
 }

src/org/thoughtcrime/securesms/notifications/MessageNotifier.java

@@ -84,6 +84,7 @@ public class MessageNotifier {
   public static final  String EXTRA_REMOTE_REPLY = "extra_remote_reply";
 
   private static final  int   SUMMARY_NOTIFICATION_ID   = 1338;
+  private static final int    PENDING_MESSAGES_ID       = 1111;
   private static final String NOTIFICATION_GROUP        = "messages";
   private static final long   MIN_AUDIBLE_PERIOD_MILLIS = TimeUnit.SECONDS.toMillis(2);
   private static final long   DESKTOP_ACTIVITY_PERIOD   = TimeUnit.MINUTES.toMillis(1);
@@ -116,6 +117,15 @@ public class MessageNotifier {
     }
   }
 
+  public static void notifyMessagesPending(Context context) {
+    if (!TextSecurePreferences.isNotificationsEnabled(context)) {
+      return;
+    }
+
+    PendingMessageNotificationBuilder builder = new PendingMessageNotificationBuilder(context, TextSecurePreferences.getNotificationPrivacy(context));
+    ServiceUtil.getNotificationManager(context).notify(PENDING_MESSAGES_ID, builder.build());
+  }
+
   public static void cancelDelayedNotifications() {
     executor.cancel();
   }
@@ -153,7 +163,8 @@ public class MessageNotifier {
           if (notification.getId() != SUMMARY_NOTIFICATION_ID &&
               notification.getId() != CallNotificationBuilder.WEBRTC_NOTIFICATION   &&
               notification.getId() != KeyCachingService.SERVICE_RUNNING_ID          &&
-              notification.getId() != MessageRetrievalService.FOREGROUND_ID)
+              notification.getId() != MessageRetrievalService.FOREGROUND_ID         &&
+              notification.getId() != PENDING_MESSAGES_ID)
           {
             for (NotificationItem item : notificationState.getNotifications()) {
               if (notification.getId() == (SUMMARY_NOTIFICATION_ID + item.getThreadId())) {

src/org/thoughtcrime/securesms/notifications/PendingMessageNotificationBuilder.java

@@ -0,0 +1,35 @@
+package org.thoughtcrime.securesms.notifications;
+
+
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.support.v4.app.NotificationCompat;
+
+import org.thoughtcrime.securesms.ConversationListActivity;
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.database.RecipientPreferenceDatabase;
+import org.thoughtcrime.securesms.preferences.NotificationPrivacyPreference;
+import org.thoughtcrime.securesms.util.TextSecurePreferences;
+
+public class PendingMessageNotificationBuilder extends AbstractNotificationBuilder {
+
+  public PendingMessageNotificationBuilder(Context context, NotificationPrivacyPreference privacy) {
+    super(context, privacy);
+
+    Intent intent = new Intent(context, ConversationListActivity.class);
+
+    setSmallIcon(R.drawable.icon_notification);
+    setColor(context.getResources().getColor(R.color.textsecure_primary));
+    setPriority(TextSecurePreferences.getNotificationPriority(context));
+    setCategory(NotificationCompat.CATEGORY_MESSAGE);
+
+    setContentTitle(context.getString(R.string.MessageNotifier_pending_signal_messages));
+    setContentText(context.getString(R.string.MessageNotifier_you_have_pending_signal_messages));
+    setTicker(context.getString(R.string.MessageNotifier_you_have_pending_signal_messages));
+
+    setContentIntent(PendingIntent.getActivity(context, 0, intent, 0));
+    setAutoCancel(true);
+    setAlarms(null, RecipientPreferenceDatabase.VibrateState.DEFAULT);
+  }
+}