Flag incoming DMs as such

* Add the 'is_direct' flag to rooms created for DMs
 * For invites, look for the DM flag when getting the DM user ID for a room
 * When accepting an invite, look for the flag and mark the room as a DM room if appropriate.

src/components/structures/RoomView.js

@@ -36,6 +36,7 @@ var dis = require("../../dispatcher");
 var Tinter = require("../../Tinter");
 var rate_limited_func = require('../../ratelimitedfunc');
 var ObjectUtils = require('../../ObjectUtils');
+var Rooms = require('../../Rooms');
 
 import UserProvider from '../../autocomplete/UserProvider';
 
@@ -674,6 +675,20 @@ module.exports = React.createClass({
         }
 
         display_name_promise.then(() => {
+            // if this is an invite and has the 'direct' hint set, mark it as a DM room now.
+            if (this.state.room) {
+                const me = this.state.room.getMember(MatrixClientPeg.get().credentials.userId);
+                if (me.membership == 'invite') {
+                    // The 'direct' hihnt is there, so declare that this is a DM room for
+                    // whoever invited us.
+                    if (me.events.member.getContent().is_direct) {
+                        return Rooms.setDMRoom(this.state.room.roomId, me.events.member.getSender());
+                    }
+                }
+            }
+
+            return q();
+        }).then(() => {
             var sign_url = this.props.thirdPartyInvite ? this.props.thirdPartyInvite.inviteSignUrl : undefined;
             return MatrixClientPeg.get().joinRoom(this.props.roomAddress,
                                                   { inviteSignUrl: sign_url } )

src/createRoom.js

@@ -57,6 +57,9 @@ function createRoom(opts) {
     if (opts.dmUserId && createOpts.invite === undefined) {
         createOpts.invite = [opts.dmUserId];
     }
+    if (opts.dmUserId && createOpts.is_direct === undefined) {
+        createOpts.is_direct = true;
+    }
 
     // Allow guests by default since the room is private and they'd
     // need an invite. This means clicking on a 3pid invite email can

src/utils/DMRoomMap.js

@@ -21,6 +21,7 @@ limitations under the License.
  */
 export default class DMRoomMap {
     constructor(matrixClient) {
+        this.matrixClient = matrixClient;
         this.roomToUser = null;
 
         const mDirectEvent = matrixClient.getAccountData('m.direct');
@@ -49,6 +50,20 @@ export default class DMRoomMap {
         }
         // 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.
+        if (this.roomToUser[roomId] === undefined) {
+            // no entry? if the room is an invite, look for the is_direct hint.
+            const room = this.matrixClient.getRoom(roomId);
+            if (room) {
+                const me = room.getMember(this.matrixClient.credentials.userId);
+                if (me.membership == 'invite') {
+                    // The 'direct' hihnt is there, so declare that this is a DM room for
+                    // whoever invited us.
+                    if (me.events.member.getContent().is_direct) {
+                        return me.events.member.getSender();
+                    }
+                }
+            }
+        }
         return this.roomToUser[roomId];
     }