Exclude functional members from DM detection (#9124)

* Exclude functional members from DM detection

* Fix getRoomFunctionalMembers test

* Simplify getFunctionalMembers

* Remove unnecessary filter

src/CallHandler.tsx

@@ -61,6 +61,7 @@ import { ViewRoomPayload } from "./dispatcher/payloads/ViewRoomPayload";
 import { KIND_CALL_TRANSFER } from "./components/views/dialogs/InviteDialogTypes";
 import { OpenInviteDialogPayload } from "./dispatcher/payloads/OpenInviteDialogPayload";
 import { findDMForUser } from './utils/dm/findDMForUser';
+import { getJoinedNonFunctionalMembers } from './utils/room/getJoinedNonFunctionalMembers';
 
 export const PROTOCOL_PSTN = 'm.protocol.pstn';
 export const PROTOCOL_PSTN_PREFIXED = 'im.vector.protocol.pstn';
@@ -861,7 +862,7 @@ export default class CallHandler extends EventEmitter {
         // We leave the check for whether there's already a call in this room until later,
         // otherwise it can race.
 
-        const members = room.getJoinedMembers();
+        const members = getJoinedNonFunctionalMembers(room);
         if (members.length <= 1) {
             Modal.createDialog(ErrorDialog, {
                 description: _t('You cannot place a call with yourself.'),

src/utils/dm/findDMForUser.ts

@@ -19,6 +19,7 @@ import { MatrixClient, Room } from "matrix-js-sdk/src/matrix";
 import DMRoomMap from "../DMRoomMap";
 import { isLocalRoom } from "../localRoom/isLocalRoom";
 import { isJoinedOrNearlyJoined } from "../membership";
+import { getFunctionalMembers } from "../room/getFunctionalMembers";
 
 /**
  * Tries to find a DM room with a specific user.
@@ -39,8 +40,11 @@ export function findDMForUser(client: MatrixClient, userId: string): Room {
         if (r && r.getMyMembership() === "join") {
             if (isLocalRoom(r)) return false;
 
+            const functionalUsers = getFunctionalMembers(r);
             const members = r.currentState.getMembers();
-            const joinedMembers = members.filter(m => isJoinedOrNearlyJoined(m.membership));
+            const joinedMembers = members.filter(
+                m => !functionalUsers.includes(m.userId) && isJoinedOrNearlyJoined(m.membership),
+            );
             const otherMember = joinedMembers.find(m => m.userId === userId);
             return otherMember && joinedMembers.length === 2;
         }

src/utils/room/getFunctionalMembers.ts

@@ -0,0 +1,27 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+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.
+*/
+
+import { Room, UNSTABLE_ELEMENT_FUNCTIONAL_USERS } from "matrix-js-sdk/src/matrix";
+
+export const getFunctionalMembers = (room: Room): string[] => {
+    const [functionalUsersStateEvent] = room.currentState.getStateEvents(UNSTABLE_ELEMENT_FUNCTIONAL_USERS.name);
+
+    if (Array.isArray(functionalUsersStateEvent?.getContent().service_members)) {
+        return functionalUsersStateEvent.getContent().service_members;
+    }
+
+    return [];
+};

src/utils/room/getJoinedNonFunctionalMembers.ts

@@ -0,0 +1,27 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+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.
+*/
+
+import { Room, RoomMember } from "matrix-js-sdk/src/matrix";
+
+import { getFunctionalMembers } from "./getFunctionalMembers";
+
+/**
+ * Returns all room members that are non-functional (bots etc.).
+ */
+export const getJoinedNonFunctionalMembers = (room: Room): RoomMember[] => {
+    const functionalMembers = getFunctionalMembers(room);
+    return room.getJoinedMembers().filter(m => !functionalMembers.includes(m.userId));
+};