Merge remote-tracking branch 'origin/develop' into dbkr/dont_crash_if_no_dm_rooms

src/utils/DMRoomMap.js

@@ -21,18 +21,13 @@ limitations under the License.
  */
 export default class DMRoomMap {
     constructor(matrixClient) {
+        this.roomToUser = null;
+
         const mDirectEvent = matrixClient.getAccountData('m.direct');
         if (!mDirectEvent) {
             this.userToRooms = {};
-            this.roomToUser = {};
         } else {
             this.userToRooms = mDirectEvent.getContent();
-            this.roomToUser = {};
-            for (const user of Object.keys(this.userToRooms)) {
-                for (const roomId of this.userToRooms[user]) {
-                    this.roomToUser[roomId] = user;
-                }
-            }
         }
     }
 
@@ -43,8 +38,26 @@ export default class DMRoomMap {
     }
 
     getUserIdForRoomId(roomId) {
+        if (this.roomToUser == null) {
+            // we lazily populate roomToUser so you can use
+            // this class just to call getDMRoomsForUserId
+            // which doesn't do very much, but is a fairly
+            // convenient wrapper and there's no point
+            // iterating through the map if getUserIdForRoomId()
+            // is never called.
+            this._populateRoomToUser();
+        }
         // Here, we return undefined if the room is not in the map:
         // the room ID you gave is not a DM room for any user.
         return this.roomToUser[roomId];
     }
+
+    _populateRoomToUser() {
+        this.roomToUser = {};
+        for (const user of Object.keys(this.userToRooms)) {
+            for (const roomId of this.userToRooms[user]) {
+                this.roomToUser[roomId] = user;
+            }
+        }
+    }
 }

src/utils/Receipt.js

@@ -0,0 +1,32 @@
+/*
+Copyright 2016 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/**
+ * Given MatrixEvent containing receipts, return the first
+ * read receipt from the given user ID, or null if no such
+ * receipt exists.
+ */
+export function findReadReceiptFromUserId(receiptEvent, userId) {
+    var receiptKeys = Object.keys(receiptEvent.getContent());
+    for (var i = 0; i < receiptKeys.length; ++i) {
+        var rcpt = receiptEvent.getContent()[receiptKeys[i]];
+        if (rcpt['m.read'] && rcpt['m.read'][userId]) {
+            return rcpt;
+        }
+    }
+
+    return null;
+}