[RN] Fix normalizing BOSH URLs (#3376)

If a relative BOSH URL is found (as docker-jitsi-meet does) construct a full URL
based on the location URL and context root.

Also remove some default options since we need the config file anyway, so I see
no point in doing the extra work.

react/features/base/connection/actions.native.js

     getCurrentConference
 } from '../conference';
 import JitsiMeetJS, { JitsiConnectionEvents } from '../lib-jitsi-meet';
-import { parseStandardURIString } from '../util';
+import { parseURIString } from '../util';
 
 import {
     CONNECTION_DISCONNECTED,
  * {@code JitsiConnection}.
  */
 function _constructOptions(state) {
-    const defaultOptions = state['features/base/connection'].options;
-    const options = _.merge(
-        {},
-        defaultOptions,
-
-        // Lib-jitsi-meet wants the config passed in multiple places and here is
-        // the latest one I have discovered.
-        state['features/base/config'],
-    );
+    // Deep clone the options to make sure we don't modify the object in the
+    // redux store.
+    const options = _.cloneDeep(state['features/base/config']);
+
+    // Normalize the BOSH URL.
     let { bosh } = options;
 
     if (bosh) {
+        if (bosh.startsWith('//')) {
+            // By default our config.js doesn't include the protocol.
+            const { locationURL } = state['features/base/connection'];
+
+            bosh = `${locationURL.protocol}${bosh}`;
+        } else if (bosh.startsWith('/')) {
+            // Handle relative URLs, which won't work on mobile.
+            const { locationURL } = state['features/base/connection'];
+            const {
+                protocol,
+                hostname,
+                contextRoot
+            } = parseURIString(locationURL.href);
+
+            // eslint-disable-next-line max-len
+            bosh = `${protocol}//${hostname}${contextRoot || '/'}${bosh.substr(1)}`;
+        }
+
         // Append room to the URL's search.
         const { room } = state['features/base/conference'];
 
         // not ignore case themselves.
         room && (bosh += `?room=${room.toLowerCase()}`);
 
-        // XXX By default, config.js does not add a protocol to the BOSH URL.
-        // Which trips React Native. Make sure there is a protocol in order to
-        // satisfy React Native.
-        if (bosh !== defaultOptions.bosh
-                && !parseStandardURIString(bosh).protocol) {
-            const { protocol } = parseStandardURIString(defaultOptions.bosh);
-
-            protocol && (bosh = protocol + bosh);
-        }
-
         options.bosh = bosh;
     }
 

react/features/base/connection/reducer.js

 
 import { SET_ROOM } from '../conference';
 import { JitsiConnectionErrors } from '../lib-jitsi-meet';
-import { assign, ReducerRegistry } from '../redux';
-import { parseURIString } from '../util';
+import { assign, set, ReducerRegistry } from '../redux';
 
 import {
     CONNECTION_DISCONNECTED,
     });
 }
 
-/**
- * Constructs options to be passed to the constructor of {@code JitsiConnection}
- * based on a specific location URL.
- *
- * @param {string} locationURL - The location URL with which the returned
- * options are to be constructed.
- * @private
- * @returns {Object} The options to be passed to the constructor of
- * {@code JitsiConnection} based on the location URL.
- */
-function _constructOptions(locationURL: URL) {
-    const locationURI = parseURIString(locationURL.href);
-
-    // FIXME The HTTPS scheme for the BOSH URL works with meet.jit.si on both
-    // mobile & Web. It also works with beta.meet.jit.si on Web. Unfortunately,
-    // it doesn't work with beta.meet.jit.si on mobile. Temporarily, use the
-    // HTTP scheme for the BOSH URL with beta.meet.jit.si on mobile.
-    let { protocol } = locationURI;
-    const domain = locationURI.hostname;
-
-    if (!protocol && domain === 'beta.meet.jit.si') {
-        const windowLocation = window.location;
-
-        windowLocation && (protocol = windowLocation.protocol);
-        protocol || (protocol = 'http:');
-    }
-
-    // Default to the HTTPS scheme for the BOSH URL.
-    protocol || (protocol = 'https:');
-
-    return {
-        bosh:
-            `${String(protocol)}//${domain}${
-                locationURI.contextRoot || '/'}http-bind`,
-        hosts: {
-            domain,
-
-            // Required by:
-            // - lib-jitsi-meet/modules/xmpp/xmpp.js
-            muc: `conference.${domain}`
-        }
-    };
-}
-
 /**
  * The current (similar to getCurrentConference in base/conference/functions.js)
  * connection which is {@code connection} or {@code connecting}.
 function _setLocationURL(
         state: Object,
         { locationURL }: { locationURL: ?URL }) {
-    return assign(state, {
-        locationURL,
-        options: locationURL ? _constructOptions(locationURL) : undefined
-    });
+    return set(state, 'locationURL', locationURL);
 }
 
 /**