remoting/webapp/xhr_proxy.js

   1 /* Copyright 2013 The Chromium Authors. All rights reserved.
   2  * Use of this source code is governed by a BSD-style license that can be
   3  * found in the LICENSE file.
   4  */
   5
   6 /**
   7  * @fileoverview
   8  * The sandbox isn't allowed to make XHRs, so they have to be proxied to the
   9  * main process. The XMLHttpRequestProxy class is API-compatible with the
  10  * XMLHttpRequest class, but forwards the requests to the main process where
  11  * they can be serviced. The forwarding of XHRs and responses is handled by
  12  * the WcsSandboxContent class; this class is just a thin wrapper to hook XHR
  13  * creations by JS running in the sandbox.
  14  *
  15  * Because XMLHttpRequest is implemented natively, and because the intent is
  16  * to replace its functionality entirely, prototype linking is not a suitable
  17  * approach here, so much of the interface definition is duplicated from the
  18  * w3c specification: http://www.w3.org/TR/XMLHttpRequest
  19  */
  20
  21 'use strict';
  22
  23 /** @suppress {duplicate} */
  24 var remoting = remoting || {};
  25
  26 /**
  27  * @constructor
  28  * @extends {XMLHttpRequest}
  29  */
  30 remoting.XMLHttpRequestProxy = function() {
  31   /**
  32    * @type {{headers: Object}}
  33    */
  34   this.sandbox_ipc = {
  35     headers: {}
  36   };
  37   /**
  38    * @type {number}
  39    * @private
  40    */
  41   this.xhr_id_ = -1;
  42 };
  43
  44 remoting.XMLHttpRequestProxy.prototype.open = function(
  45     method, url, async, user, password) {
  46   if (!async) {
  47     console.warn('Synchronous XHRs are not supported.');
  48   }
  49   this.sandbox_ipc.method = method;
  50   this.sandbox_ipc.url = url.toString();
  51   this.sandbox_ipc.user = user;
  52   this.sandbox_ipc.password = password;
  53 };
  54
  55 remoting.XMLHttpRequestProxy.prototype.send = function(data) {
  56   if (remoting.sandboxContent) {
  57     this.sandbox_ipc.data = data;
  58     this.xhr_id_ = remoting.sandboxContent.sendXhr(this);
  59   }
  60 };
  61
  62 remoting.XMLHttpRequestProxy.prototype.setRequestHeader = function(
  63     header, value) {
  64   this.sandbox_ipc.headers[header] = value;
  65 };
  66
  67 remoting.XMLHttpRequestProxy.prototype.abort = function() {
  68   if (this.xhr_id_ != -1) {
  69     remoting.sandboxContent.abortXhr(this.xhr_id_);
  70   }
  71 };
  72
  73 remoting.XMLHttpRequestProxy.prototype.getResponseHeader = function(header) {
  74   console.error('Sandbox: unproxied getResponseHeader(' + header + ') called.');
  75 };
  76
  77 remoting.XMLHttpRequestProxy.prototype.getAllResponseHeaders = function() {
  78   console.error('Sandbox: unproxied getAllResponseHeaders called.');
  79 };
  80
  81 remoting.XMLHttpRequestProxy.prototype.overrideMimeType = function() {
  82   console.error('Sandbox: unproxied overrideMimeType called.');
  83 };
  84
  85 remoting.XMLHttpRequestProxy.prototype.UNSENT = 0;
  86 remoting.XMLHttpRequestProxy.prototype.OPENED = 1;
  87 remoting.XMLHttpRequestProxy.prototype.HEADERS_RECEIVED = 2;
  88 remoting.XMLHttpRequestProxy.prototype.LOADING = 3;
  89 remoting.XMLHttpRequestProxy.prototype.DONE = 4;