src/third_party/WebKit/Source/modules/serviceworkers/polyfills/fetchPolyfill.js

   1 // Copyright 2014 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 // A simple, incomplete implementation of Fetch, intended to facilitate end
   6 // to end serviceworker testing.
   7
   8 // See http://fetch.spec.whatwg.org/#fetch-method
   9
  10 (function (global) {
  11     var _castToRequest = function (item) {
  12         if (typeof item === 'string') {
  13             item = new Request({
  14                 url: item
  15             });
  16         }
  17         return item;
  18     };
  19
  20     // FIXME: Support init argument to fetch.
  21     var fetch = function(request) {
  22         request = _castToRequest(request);
  23
  24         return new Promise(function(resolve, reject) {
  25             // FIXME: Use extra headers from |request|.
  26             var xhr = new XMLHttpRequest();
  27             xhr.open(request.method, request.url, true /* async */);
  28             xhr.send(null);
  29             xhr.onreadystatechange = function() {
  30                 if (xhr.readyState !== 4) return;
  31
  32                 var response = new Response({
  33                     status: xhr.status,
  34                     statusText: xhr.statusText,
  35                     // FIXME: Set response.headers.
  36                     // FIXME: Set response.method when available.
  37                     // FIXME: Set response.url when available.
  38                     // FIXME: Set response.body when available.
  39                 });
  40
  41                 if (xhr.status === 200) {
  42                     resolve(response);
  43                 } else {
  44                     reject(response);
  45                 }
  46             };
  47         });
  48     };
  49
  50     global.fetch = global.fetch || fetch;
  51 }(self));  // window or worker global scope