Functional members

src/@types/event.ts

@@ -144,6 +144,15 @@ export const UNSTABLE_MSC3089_LEAF = new UnstableValue("m.leaf", "org.matrix.msc
  */
 export const UNSTABLE_MSC3089_BRANCH = new UnstableValue("m.branch", "org.matrix.msc3089.branch");
 
+/**
+ * Functional members type for declaring a purpose of room members (e.g. helpful bots).
+ * Note that this reference is UNSTABLE and subject to breaking changes, including its
+ * eventual removal.
+ */
+export const UNSTABLE_ELEMENT_FUNCTIONAL_USERS = new UnstableValue(
+    "io.element.functional_members",
+    "io.element.functional_members");
+
 export interface IEncryptedFile {
     url: string;
     mimetype?: string;

src/models/room.ts

@@ -30,7 +30,7 @@ import { RoomMember } from "./room-member";
 import { IRoomSummary, RoomSummary } from "./room-summary";
 import { logger } from '../logger';
 import { ReEmitter } from '../ReEmitter';
-import { EventType, RoomCreateTypeField, RoomType } from "../@types/event";
+import { EventType, RoomCreateTypeField, RoomType, UNSTABLE_ELEMENT_FUNCTIONAL_USERS } from "../@types/event";
 import { IRoomVersionsCapability, MatrixClient, RoomVersionStability } from "../client";
 import { ResizeMethod } from "../@types/partials";
 import { Filter } from "../filter";
@@ -2037,22 +2037,43 @@ export class Room extends EventEmitter {
         const joinedMemberCount = this.currentState.getJoinedMemberCount();
         const invitedMemberCount = this.currentState.getInvitedMemberCount();
         // -1 because these numbers include the syncing user
-        const inviteJoinCount = joinedMemberCount + invitedMemberCount - 1;
+        let inviteJoinCount = joinedMemberCount + invitedMemberCount - 1;
+
+        // get service members (e.g. helper bots) for exclusion
+        let excludedUserIds: string[] = [];
+        const mFunctionalMembers = this.currentState.getStateEvents(UNSTABLE_ELEMENT_FUNCTIONAL_USERS.unstable, "");
+        if (Array.isArray(mFunctionalMembers?.getContent().service_members)) {
+            excludedUserIds = mFunctionalMembers.getContent().service_members;
+        }
 
         // get members that are NOT ourselves and are actually in the room.
         let otherNames = null;
         if (this.summaryHeroes) {
             // if we have a summary, the member state events
             // should be in the room state
-            otherNames = this.summaryHeroes.map((userId) => {
+            otherNames = [];
+            this.summaryHeroes.forEach((userId) => {
+                // filter service members
+                if (excludedUserIds.includes(userId)) {
+                    inviteJoinCount--;
+                    return;
+                }
                 const member = this.getMember(userId);
-                return member ? member.name : userId;
+                otherNames.push(member ? member.name : userId);
             });
         } else {
             let otherMembers = this.currentState.getMembers().filter((m) => {
                 return m.userId !== userId &&
                     (m.membership === "invite" || m.membership === "join");
             });
+            otherMembers = otherMembers.filter(({ userId }) => {
+                // filter service members
+                if (excludedUserIds.includes(userId)) {
+                    inviteJoinCount--;
+                    return false;
+                }
+                return true;
+            });
             // make sure members have stable order
             otherMembers.sort((a, b) => a.userId.localeCompare(b.userId));
             // only 5 first members, immitate summaryHeroes
@@ -2065,7 +2086,7 @@ export class Room extends EventEmitter {
         }
 
         const myMembership = this.getMyMembership();
-        // if I have created a room and invited people throuh
+        // if I have created a room and invited people through
         // 3rd party invites
         if (myMembership == 'join') {
             const thirdPartyInvites =