[http] Create slim proxy for http requests.

This will send a normal request and if we receive an 401 status, we send another request with withCredentials = true

http.js

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2016  Jones Magloire @Joxit
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+function Http() {
+  this.oReq = new XMLHttpRequest();
+  this._events = {};
+}
+
+Http.prototype.addEventListener = function(e, f) {
+  this._events[e] = f;
+  switch (e) {
+    case 'loadend':
+      {
+        this.oReq.addEventListener('loadend', function() {
+          if (this.status == 401) {
+            var req = new XMLHttpRequest();
+            for (key in this.http._events) {
+              req.addEventListener(key, this.http._events[key]);
+            }
+            req.withCredentials = true;
+            req.open(this.http._method, this.http._url);
+            req.send();
+          } else {
+            f.bind(this.oReq);
+          }
+        });
+        break;
+      }
+    default:
+      {
+        this.oReq.addEventListener(e, function() {
+          f.bind(this.oReq);
+        });
+        break;
+      }
+  }
+};
+
+Http.prototype.open = function(m, u) {
+  this._method = m;
+  this._url = u;
+  this.oReq.open(m, u);
+};
+
+Http.prototype.send = function() {
+  this.oReq.http = this;
+  this.oReq.send();
+};