Add utility method for constructing JWT login service URL

JitsiMeetJS.js

@@ -1,4 +1,5 @@
 var logger = require("jitsi-meet-logger").getLogger(__filename);
+var AuthUtil = require("./modules/util/AuthUtil");
 var JitsiConnection = require("./JitsiConnection");
 var JitsiMediaDevices = require("./JitsiMediaDevices");
 var JitsiConferenceEvents = require("./JitsiConferenceEvents");
@@ -236,7 +237,8 @@ var LibJitsiMeet = {
      */
     util: {
         ScriptUtil: ScriptUtil,
-        RTCUIHelper: RTCUIHelper
+        RTCUIHelper: RTCUIHelper,
+        AuthUtil: AuthUtil
     }
 };
 

modules/util/AuthUtil.js

@@ -0,0 +1,33 @@
+var AuthUtil = {
+    /**
+     * Creates the URL pointing to JWT token authentication service. It is
+     * formatted from the 'urlPattern' argument which can contain the following
+     * constants:
+     * '{room}' - name of the conference room passed as <tt>roomName</tt>
+     * argument to this method.
+     * '{roleUpgrade}' - will contain 'true' if the URL will be used for
+     * the role upgrade scenario, where user connects from anonymous domain and
+     * then gets upgraded to the moderator by logging-in from the popup window.
+     *
+     * @param urlPattern a URL pattern pointing to the login service
+     * @param roomName the name of the conference room for which the user will
+     * be authenticated
+     * @param {bool} roleUpgrade <tt>true</tt> if the URL will be used for role
+     * upgrade scenario, where the user logs-in from the popup window in order
+     * to have the moderator rights granted
+     *
+     * @returns {string|null} the URL pointing to JWT login service or
+     * <tt>null</tt> if 'urlPattern' is not a string and the URL can not be
+     * constructed.
+     */
+    getTokenAuthUrl: function (urlPattern, roomName, roleUpgrade) {
+        var url = urlPattern;
+        if (typeof url !== "string") {
+            return null;
+        }
+        return url.replace("{room}", roomName)
+            .replace("{roleUpgrade}", roleUpgrade === true);
+    }
+};
+
+module.exports = AuthUtil;