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Issue 29334701: Issue 3588 - Worked around fetch() API not supporting chrome-extension:// URLs on Chrome <47 (Closed)
Patch Set: Created Jan. 27, 2016, 1 p.m.
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1 /* 1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>, 2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-2016 Eyeo GmbH 3 * Copyright (C) 2006-2016 Eyeo GmbH
4 * 4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify 5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as 6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
8 * 8 *
9 * Adblock Plus is distributed in the hope that it will be useful, 9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details. 12 * GNU General Public License for more details.
13 * 13 *
14 * You should have received a copy of the GNU General Public License 14 * You should have received a copy of the GNU General Public License
15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>. 15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
16 */ 16 */
17 17
18 "use strict"; 18 "use strict";
19 19
20 (function(global) 20 (function(global)
21 { 21 {
22 if ("fetch" in global)
23 return;
24
25 function Response(xhr) 22 function Response(xhr)
26 { 23 {
27 this._xhr = xhr; 24 this._xhr = xhr;
28 } 25 }
29 Response.prototype = { 26 Response.prototype = {
30 get ok() 27 get ok()
31 { 28 {
32 return this._xhr.status >= 200 && this._xhr.status <= 299; 29 return this._xhr.status >= 200 && this._xhr.status <= 299;
33 }, 30 },
34 text: function() 31 text: function()
35 { 32 {
36 return Promise.resolve(this._xhr.responseText); 33 return Promise.resolve(this._xhr.responseText);
37 } 34 }
38 }; 35 };
39 36
40 global.fetch = function(url) 37 function fetch(url)
41 { 38 {
42 return new Promise(function(resolve, reject) 39 return new Promise(function(resolve, reject)
43 { 40 {
44 var xhr = new XMLHttpRequest(); 41 var xhr = new XMLHttpRequest();
45 42
46 xhr.onload = function() 43 xhr.onload = function()
47 { 44 {
48 resolve(new Response(xhr)); 45 resolve(new Response(xhr));
49 }; 46 };
50 47
51 xhr.onerror = xhr.onabort = function() 48 xhr.onerror = xhr.onabort = function()
52 { 49 {
53 reject(new TypeError("Failed to fetch")); 50 reject(new TypeError("Failed to fetch"));
54 }; 51 };
55 52
56 xhr.overrideMimeType("text/plain"); 53 xhr.overrideMimeType("text/plain");
57 xhr.open("GET", url); 54 xhr.open("GET", url);
58 xhr.send(); 55 xhr.send();
59 }); 56 });
60 }; 57 }
58
59 // While the Fetch API is natively supported since Chrome 42, before
60 // Chrome 47 it failed to fetch files from within the extension bundle.
61 // https://code.google.com/p/chromium/issues/detail?id=466876
62 var builtinFetch = global.fetch;
63 if (builtinFetch)
64 global.fetch = function(url, init)
65 {
66 return builtinFetch(url, init).catch(function(reason)
67 {
68 if (new URL(url, document.URL).protocol == "chrome-extension:")
69 return fetch(url)
70 throw reason;
71 });
72 };
73 else
74 global.fetch = fetch;
61 })(this); 75 })(this);
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