Add room.getAliases() and room.getCanonicalAlias()

CHANGELOG.md

@@ -1,3 +1,8 @@
+Changes in [?](?) (?)
+=====================
+
+ * Add room.getAliases() and room.getCanonicalAlias
+
 Changes in [0.5.4](https://github.com/matrix-org/matrix-js-sdk/releases/tag/v0.5.4) (2016-06-02)
 ================================================================================================
 [Full Changelog](https://github.com/matrix-org/matrix-js-sdk/compare/v0.5.3...v0.5.4)

lib/models/room.js

@@ -341,6 +341,40 @@ Room.prototype.getAvatarUrl = function(baseUrl, width, height, resizeMethod,
     return null;
 };
 
+/**
+ * Get the aliases this room has according to the room's state
+ * The aliases returned by this function may not necessarily
+ * still point to this room.
+ * @return {array} The room's alias as an array of strings
+ */
+Room.prototype.getAliases = function() {
+    var alias_strings = [];
+
+    var alias_events = this.currentState.getStateEvents("m.room.aliases");
+    if (alias_events) {
+        for (var alias_event of alias_events) {
+            if (utils.isArray(alias_event.getContent().aliases)) {
+                Array.prototype.push.apply(alias_strings, alias_event.getContent().aliases);
+            }
+        }
+    }
+    return alias_strings;
+};
+
+/**
+ * Get this room's canonical alias
+ * The alias returned by this function may not necessarily
+ * still point to this room.
+ * @return {?string} The room's canonical alias, or null if there is none
+ */
+Room.prototype.getCanonicalAlias = function() {
+    var canonicalAlias = this.currentState.getStateEvents("m.room.canonical_alias", "");
+    if (canonicalAlias) {
+        return canonicalAlias.getContent().alias;
+    }
+    return null;
+};
+
 /**
  * Get a member from the current room state.
  * @param {string} userId The user ID of the member.
@@ -1344,16 +1378,13 @@ function calculateRoomName(room, userId, ignoreRoomNameEvent) {
         }
     }
 
-    var alias;
-    var canonicalAlias = room.currentState.getStateEvents("m.room.canonical_alias", "");
-    if (canonicalAlias) {
-        alias = canonicalAlias.getContent().alias;
-    }
+    var alias = room.getCanonicalAlias();
 
     if (!alias) {
-        var mRoomAliases = room.currentState.getStateEvents("m.room.aliases")[0];
-        if (mRoomAliases && utils.isArray(mRoomAliases.getContent().aliases)) {
-            alias = mRoomAliases.getContent().aliases[0];
+        var aliases = room.getAliases();
+
+        if (aliases.length) {
+            alias = aliases[0];
         }
     }
     if (alias) {