Put group calling behind a remote feature flag

ts/RemoteConfig.ts

@@ -8,6 +8,7 @@ type ConfigKeyType =
   | 'desktop.cds'
   | 'desktop.clientExpiration'
   | 'desktop.disableGV1'
+  | 'desktop.groupCalling'
   | 'desktop.gv2'
   | 'desktop.mandatoryProfileSharing'
   | 'desktop.messageRequests'

ts/background.ts

@@ -2658,7 +2658,7 @@ type WhatIsThis = import('./window.d').WhatIsThis;
 
     if (data.message.groupCallUpdate) {
       if (data.message.groupV2 && messageDescriptor.type === Message.GROUP) {
-        if (window.GROUP_CALLING) {
+        if (window.isGroupCallingEnabled()) {
           window.reduxActions.calling.peekNotConnectedGroupCall({
             conversationId: messageDescriptor.id,
           });

ts/state/smart/ConversationHeader.tsx

@@ -18,6 +18,7 @@ import { getActiveCall, isAnybodyElseInGroupCall } from '../ducks/calling';
 import { getUserConversationId, getIntl } from '../selectors/user';
 import { getOwn } from '../../util/getOwn';
 import { missingCaseError } from '../../util/missingCaseError';
+import { isGroupCallingEnabled } from '../../util/isGroupCallingEnabled';
 
 export interface OwnProps {
   id: string;
@@ -57,7 +58,7 @@ const getOutgoingCallButtonStyle = (
     case CallMode.Direct:
       return OutgoingCallButtonStyle.Both;
     case CallMode.Group: {
-      if (!window.GROUP_CALLING) {
+      if (!isGroupCallingEnabled()) {
         return OutgoingCallButtonStyle.None;
       }
       const call = getOwn(calling.callsByConversation, conversation.id);

ts/test-both/util/version_test.ts

@@ -0,0 +1,22 @@
+// Copyright 2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { isBeta } from '../../util/version';
+
+describe('version utilities', () => {
+  describe('isBeta', () => {
+    it('returns false for non-beta version strings', () => {
+      assert.isFalse(isBeta('1.2.3'));
+      assert.isFalse(isBeta('1.2.3-alpha'));
+      assert.isFalse(isBeta('1.2.3-alpha.1'));
+      assert.isFalse(isBeta('1.2.3-rc.1'));
+    });
+
+    it('returns true for beta version strings', () => {
+      assert.isTrue(isBeta('1.2.3-beta'));
+      assert.isTrue(isBeta('1.2.3-beta.1'));
+    });
+  });
+});

ts/util/isGroupCallingEnabled.ts

@@ -0,0 +1,13 @@
+// Copyright 2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { isBeta } from './version';
+import * as RemoteConfig from '../RemoteConfig';
+
+// We can remove this function once group calling has been turned on for everyone.
+export function isGroupCallingEnabled(): boolean {
+  return (
+    RemoteConfig.isEnabled('desktop.groupCalling') ||
+    isBeta(window.getVersion())
+  );
+}

ts/util/version.ts

@@ -0,0 +1,7 @@
+// Copyright 2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import * as semver from 'semver';
+
+export const isBeta = (version: string): boolean =>
+  semver.parse(version)?.prerelease[0] === 'beta';

ts/window.d.ts

@@ -486,7 +486,7 @@ declare global {
     readyForUpdates: () => void;
 
     // Flags
-    GROUP_CALLING: boolean;
+    isGroupCallingEnabled: () => boolean;
   }
 
   interface Error {