feat(external-storage): Support.

JitsiMeetJS.js

 import ProxyConnectionService
     from './modules/proxyconnection/ProxyConnectionService';
 import recordingConstants from './modules/recording/recordingConstants';
+import Settings from './modules/settings/Settings';
 import LocalStatsCollector from './modules/statistics/LocalStatsCollector';
 import precallTest from './modules/statistics/PrecallTest';
 import Statistics from './modules/statistics/statistics';
     mediaDevices: JitsiMediaDevices,
     analytics: Statistics.analytics,
     init(options = {}) {
+        Settings.init(options.externalStorage);
         Statistics.init(options);
 
         // Initialize global window.connectionTimes

doc/API.md

     - `enableWindowOnErrorHandler` - boolean property (default false). Enables/disables attaching global onerror handler (window.onerror).
     - `disableThirdPartyRequests` - if true - callstats will be disabled and the callstats API won't be included.
     - `enableAnalyticsLogging` - boolean property (default false). Enables/disables analytics logging.
+    - `externalStorage` - Object that implements the Storage interface. If specified this object will be used for storing data instead of `localStorage`.
     - `callStatsCustomScriptUrl` - (optional) custom url to access callstats client script
     - `disableRtx` - (optional) boolean property (default to false).  Enables/disable the use of RTX.
     - `disableH264` - (optional) boolean property (default to false).  If enabled, strips the H.264 codec from the local SDP.

modules/settings/Settings.js

  *
  */
 export default {
+
+    /**
+     * The storage used to store the settings.
+     */
+    _storage: jitsiLocalStorage,
+
+    /**
+     * Initializes the Settings class.
+     *
+     * @param {Storage|undefined} externalStorage - Object that implements the Storage interface. This object will be
+     * used for storing data instead of jitsiLocalStorage if specified.
+     */
+    init(externalStorage) {
+        this._storage = externalStorage || jitsiLocalStorage;
+    },
+
     /**
      * Returns fake username for callstats
      * @returns {string} fake username for callstats
      */
     get callStatsUserName() {
         if (!_callStatsUserName) {
-            _callStatsUserName = jitsiLocalStorage.getItem('callStatsUserName');
+            _callStatsUserName = this._storage.getItem('callStatsUserName');
             if (!_callStatsUserName) {
                 _callStatsUserName = generateCallStatsUserName();
-                jitsiLocalStorage.setItem('callStatsUserName', _callStatsUserName);
+                this._storage.setItem('callStatsUserName', _callStatsUserName);
             }
         }
 
      */
     get machineId() {
         if (!_machineId) {
-            _machineId = jitsiLocalStorage.getItem('jitsiMeetId');
+            _machineId = this._storage.getItem('jitsiMeetId');
             if (!_machineId) {
                 _machineId = generateJitsiMeetId();
-                jitsiLocalStorage.setItem('jitsiMeetId', _machineId);
+                this._storage.setItem('jitsiMeetId', _machineId);
             }
         }
 
     get sessionId() {
         // We may update sessionId in localStorage from another JitsiConference
         // instance and that's why we should always re-read it.
-        return jitsiLocalStorage.getItem('sessionId');
+        return this._storage.getItem('sessionId');
     },
 
     /**
      */
     set sessionId(sessionId) {
         if (sessionId) {
-            jitsiLocalStorage.setItem('sessionId', sessionId);
+            this._storage.setItem('sessionId', sessionId);
         } else {
-            jitsiLocalStorage.removeItem('sessionId');
+            this._storage.removeItem('sessionId');
         }
     }
 };

package-lock.json

       }
     },
     "@jitsi/js-utils": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/@jitsi/js-utils/-/js-utils-1.0.0.tgz",
-      "integrity": "sha512-at9GPMP7IL0v6QS1Gs9c5MbbiN2AT0uKzsgKM8qS2wqXxqvpfT3p4U3+LH2IUyXiHlkmvlBMcNM02MltBdyRmQ==",
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@jitsi/js-utils/-/js-utils-1.0.2.tgz",
+      "integrity": "sha512-ls+X9tn9EemUQwPEBr7Z0UD4sjRtwcu1Bh4MUo0Hv4arp0KVzcCYCW+mofsvuZvHg8xJX12LLNVgUKi1X5XTGg==",
       "requires": {
         "bowser": "2.7.0",
-        "js-md5": "0.7.3",
-        "postis": "2.2.0"
+        "js-md5": "0.7.3"
       }
     },
     "@jitsi/sdp-interop": {
       "integrity": "sha1-AerA/jta9xoqbAL+q7jB/vfgDqs=",
       "dev": true
     },
-    "postis": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/postis/-/postis-2.2.0.tgz",
-      "integrity": "sha1-3F4yN2WYXd/cv9r8MUGpVprvdak="
-    },
     "prelude-ls": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",

package.json

   "author": "",
   "readmeFilename": "README.md",
   "dependencies": {
-    "@jitsi/js-utils": "1.0.0",
+    "@jitsi/js-utils": "1.0.2",
     "@jitsi/sdp-interop": "1.0.3",
     "@jitsi/sdp-simulcast": "0.3.0",
     "async": "0.9.0",