feat(client): allow disabling VoIP support (#5021)

* feat(client): allow disabling VoIP support

* feat(client): allow disabling VoIP support

Signed-off-by: Bahaa Naamneh <b.naamneh@gmail.com>

* add a unit-test for disableVoip option

* fix lint issue

---------

Signed-off-by: Bahaa Naamneh <b.naamneh@gmail.com>
Co-authored-by: Bahaa Naamneh <glimm.no@gmail.com>

spec/unit/matrix-client.spec.ts

@@ -2366,6 +2366,61 @@ describe("MatrixClient", function () {
         });
     });
 
+    describe("disableVoip option", () => {
+        const baseUrl = "https://alice-server.com";
+        const userId = "@alice:bar";
+        const accessToken = "sometoken";
+
+        beforeEach(() => {
+            mocked(supportsMatrixCall).mockReturnValue(true);
+        });
+
+        afterAll(() => {
+            mocked(supportsMatrixCall).mockReset();
+        });
+
+        it("should not call /voip/turnServer when disableVoip = true", () => {
+            fetchMock.getOnce(`${baseUrl}/_matrix/client/unstable/voip/turnServer`, 200);
+
+            const client = createClient({
+                baseUrl,
+                accessToken,
+                userId,
+                disableVoip: true,
+            });
+
+            // Only check createCall / supportsVoip, avoid startClient
+            expect(client.createCall("!roomId:example.com")).toBeNull();
+            expect(client.supportsVoip?.()).toBe(false);
+        });
+
+        it("should call /voip/turnServer when disableVoip is not set", () => {
+            fetchMock.getOnce(`${baseUrl}/_matrix/client/unstable/voip/turnServer`, {
+                uris: ["turn:turn.example.org"],
+            });
+
+            createClient({
+                baseUrl,
+                accessToken,
+                userId,
+            });
+
+            // The call will trigger the request if VoIP is supported
+            expect(fetchMock.called(`${baseUrl}/_matrix/client/unstable/voip/turnServer`)).toBe(false);
+        });
+
+        it("should return null from createCall when disableVoip = true", () => {
+            const client = createClient({
+                baseUrl,
+                accessToken,
+                userId,
+                disableVoip: true,
+            });
+
+            expect(client.createCall("!roomId:example.com")).toBeNull();
+        });
+    });
+
     describe("support for ignoring invites", () => {
         beforeEach(() => {
             // Mockup `getAccountData`/`setAccountData`.

src/client.ts

@@ -443,6 +443,12 @@ export interface ICreateClientOpts {
      */
     isVoipWithNoMediaAllowed?: boolean;
 
+    /**
+     * Disable VoIP support (prevents fetching TURN servers, etc.)
+     * Default: false (VoIP enabled)
+     */
+    disableVoip?: boolean;
+
     /**
      * If true, group calls will not establish media connectivity and only create the signaling events,
      * so that livekit media can be used in the application layer (js-sdk contains no livekit code).
@@ -1220,6 +1226,7 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
     public idBaseUrl?: string;
     public baseUrl: string;
     public readonly isVoipWithNoMediaAllowed;
+    public disableVoip: boolean;
 
     public useLivekitForGroupCalls: boolean;
 
@@ -1346,7 +1353,9 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
             });
         }
 
-        if (supportsMatrixCall()) {
+        this.disableVoip = opts.disableVoip ?? false;
+
+        if (!this.disableVoip && supportsMatrixCall()) {
             this.callEventHandler = new CallEventHandler(this);
             this.groupCallEventHandler = new GroupCallEventHandler(this);
             this.canSupportVoip = true;
@@ -1433,7 +1442,7 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
         }
 
         // periodically poll for turn servers if we support voip
-        if (this.canSupportVoip) {
+        if (this.supportsVoip()) {
             this.checkTurnServersIntervalID = setInterval(() => {
                 this.checkTurnServers();
             }, TURN_CHECK_INTERVAL);
@@ -1670,7 +1679,7 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
      * @returns True if VoIP is supported.
      */
     public supportsVoip(): boolean {
-        return this.canSupportVoip;
+        return !this.disableVoip && this.canSupportVoip;
     }
 
     /**
@@ -5622,7 +5631,7 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
 
     // XXX: Intended private, used in code.
     public async checkTurnServers(): Promise<boolean | undefined> {
-        if (!this.canSupportVoip) {
+        if (!this.supportsVoip()) {
             return;
         }