rn: add a new advanced settings section

Currently only 2 options are implemented, mainly aimed at helping troubleshoot
audio related problems:

- Disable native call integration (it disables CallKit / ConnectionService)
- Disable P2P

react/features/mobile/call-integration/functions.js

@@ -0,0 +1,20 @@
+// @flow
+
+import { CALL_INTEGRATION_ENABLED, getFeatureFlag } from '../../base/flags';
+import { toState } from '../../base/redux';
+
+/**
+ * Checks if call integration is enabled or not.
+ *
+ * @param {Function|Object} stateful - The redux store or {@code getState}
+ * function.
+ * @returns {string} - Default URL for the app.
+ */
+export function isCallIntegrationEnabled(stateful: Function | Object) {
+    const state = toState(stateful);
+    const { disableCallIntegration } = state['features/base/settings'];
+    const flag = getFeatureFlag(state, CALL_INTEGRATION_ENABLED);
+
+    // The feature flag has precedence.
+    return flag ?? !disableCallIntegration;
+}

react/features/mobile/call-integration/middleware.js

@@ -34,6 +34,7 @@ import { _SET_CALL_INTEGRATION_SUBSCRIPTIONS } from './actionTypes';
 
 import CallKit from './CallKit';
 import ConnectionService from './ConnectionService';
+import { isCallIntegrationEnabled } from './functions';
 
 const CallIntegration = CallKit || ConnectionService;
 
@@ -139,9 +140,13 @@ function _appWillMount({ dispatch, getState }, next, action) {
  * @private
  * @returns {*} The value returned by {@code next(action)}.
  */
-function _conferenceFailed(store, next, action) {
+function _conferenceFailed({ getState }, next, action) {
     const result = next(action);
 
+    if (!isCallIntegrationEnabled(getState)) {
+        return result;
+    }
+
     // XXX Certain CONFERENCE_FAILED errors are recoverable i.e. they have
     // prevented the user from joining a specific conference but the app may be
     // able to eventually join the conference.
@@ -173,6 +178,10 @@ function _conferenceFailed(store, next, action) {
 function _conferenceJoined({ getState }, next, action) {
     const result = next(action);
 
+    if (!isCallIntegrationEnabled(getState)) {
+        return result;
+    }
+
     const { callUUID } = action.conference;
 
     if (callUUID) {
@@ -201,9 +210,13 @@ function _conferenceJoined({ getState }, next, action) {
  * @private
  * @returns {*} The value returned by {@code next(action)}.
  */
-function _conferenceLeft(store, next, action) {
+function _conferenceLeft({ getState }, next, action) {
     const result = next(action);
 
+    if (!isCallIntegrationEnabled(getState)) {
+        return result;
+    }
+
     const { callUUID } = action.conference;
 
     if (callUUID) {
@@ -230,6 +243,10 @@ function _conferenceLeft(store, next, action) {
 function _conferenceWillJoin({ dispatch, getState }, next, action) {
     const result = next(action);
 
+    if (!isCallIntegrationEnabled(getState)) {
+        return result;
+    }
+
     const { conference } = action;
     const state = getState();
     const { callHandle, callUUID } = state['features/base/config'];
@@ -341,6 +358,11 @@ function _onPerformSetMutedCallAction({ callUUID, muted }) {
 function _setAudioOnly({ getState }, next, action) {
     const result = next(action);
     const state = getState();
+
+    if (!isCallIntegrationEnabled(state)) {
+        return result;
+    }
+
     const conference = getCurrentConference(state);
 
     if (conference && conference.callUUID) {
@@ -393,6 +415,11 @@ function _setCallKitSubscriptions({ getState }, next, action) {
  */
 function _syncTrackState({ getState }, next, action) {
     const result = next(action);
+
+    if (!isCallIntegrationEnabled(getState)) {
+        return result;
+    }
+
     const { jitsiTrack } = action.track;
     const state = getState();
     const conference = getCurrentConference(state);