Change login with CAS to redirect to HS for CAS login

lib/client.js

@@ -1722,28 +1722,12 @@ MatrixClient.prototype.loginWithSAML2 = function(relayState, callback) {
 };
 
 /**
- * @param {module:client.callback} callback Optional.
- * @return {module:client.Promise} Resolves: TODO
- * @return {module:http-api.MatrixError} Rejects: with an error response.
+ * @param {string} redirectUrl URL to which to be redirect to after
+ * HS authenticates with CAS and issues login token
+ * Will redirect to homeserver to complete CAS login
  */
-MatrixClient.prototype.getCasServer = function(callback) {
-    return this._http.request(
-        callback, "GET", "/login/cas", undefined, undefined
-    );
-};
-
-/**
- * @param {string} ticket (Received from CAS)
- * @param {string} service Service to which the token was granted
- * @param {module:client.callback} callback Optional.
- * @return {module:client.Promise} Resolves: TODO
- * @return {module:http-api.MatrixError} Rejects: with an error response.
- */
-MatrixClient.prototype.loginWithCas = function(ticket, service, callback) {
-    return this.login("m.login.cas", {
-        ticket: ticket,
-        service: service
-    }, callback);
+MatrixClient.prototype.loginWithCas = function(redirectUrl) {
+    this._http.redirect("/login/cas/redirect", {"redirectUrl": redirectUrl}, httpApi.PREFIX_V1);
 };
 
 /**

lib/http-api.js

@@ -296,6 +296,15 @@ module.exports.MatrixHttpApi.prototype = {
         return this._request(callback, method, fullUri, queryParams, data);
     },
 
+    redirect: function(path, queryParams, prefix) {
+        var queryString = "";
+        if (queryParams) {
+            queryString = "?" + utils.encodeParams(queryParams);
+        }
+        var fullUri = this.opts.baseUrl + prefix + path + queryString;
+        window.location.href = fullUri;
+    },
+
     _request: function(callback, method, uri, queryParams, data) {
         if (callback !== undefined && !utils.isFunction(callback)) {
             throw Error(