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1 /* | |
2 * Copyright (C) 2011 Google Inc. All rights reserved. | |
3 * | |
4 * Redistribution and use in source and binary forms, with or without | |
5 * modification, are permitted provided that the following conditions | |
6 * are met: | |
7 * 1. Redistributions of source code must retain the above copyright | |
8 * notice, this list of conditions and the following disclaimer. | |
9 * 2. Redistributions in binary form must reproduce the above copyright | |
10 * notice, this list of conditions and the following disclaimer in the | |
11 * documentation and/or other materials provided with the distribution. | |
12 * | |
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' | |
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS | |
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | |
23 * THE POSSIBILITY OF SUCH DAMAGE. | |
24 */ | |
25 | |
26 var net = net || {}; | |
27 | |
28 (function () { | |
29 | |
30 net.json = function(url) | |
31 { | |
32 return net.ajax({ | |
33 url: url, | |
34 parse: function(xhr) { | |
35 return JSON.parse(xhr.responseText); | |
36 } | |
37 }); | |
38 }; | |
39 | |
40 net.xml = function(url) | |
41 { | |
42 return net.ajax({ | |
43 url: url, | |
44 parse: function(xhr) { | |
45 return xhr.responseXML; | |
46 } | |
47 }); | |
48 }; | |
49 | |
50 net.ajax = function(options) | |
51 { | |
52 return new Promise(function(resolve, reject) { | |
53 var xhr = new XMLHttpRequest(); | |
54 var method = options.type || 'GET'; | |
55 var async = true; | |
56 xhr.open(method, options.url, async); | |
57 xhr.onload = function() { | |
58 if (xhr.status == 200) { | |
59 if (options.parse) | |
60 resolve(options.parse(xhr)); | |
61 else | |
62 resolve(xhr.responseText); | |
63 } | |
64 else if (xhr.status != 200) | |
65 reject(Error(xhr.statusText)); | |
66 }; | |
67 xhr.onerror = function(error) { | |
68 reject(error); | |
69 }; | |
70 var data = options.data || null; | |
71 if (data) | |
72 xhr.setRequestHeader("content-type","application/x-www-form-urlencod
ed"); | |
73 xhr.send(data); | |
74 }); | |
75 }; | |
76 | |
77 net.probe = function(url) | |
78 { | |
79 return net.ajax({ | |
80 url: url, | |
81 type: 'HEAD', | |
82 }); | |
83 }; | |
84 | |
85 net._parseJSONP = function(jsonp) | |
86 { | |
87 if (!jsonp) | |
88 return {}; | |
89 | |
90 if (!jsonp.match(/^[^{[]*\(/)) | |
91 return JSON.parse(jsonp); | |
92 | |
93 var startIndex = jsonp.indexOf('(') + 1; | |
94 var endIndex = jsonp.lastIndexOf(')'); | |
95 if (startIndex == 0 || endIndex == -1) | |
96 return {}; | |
97 return JSON.parse(jsonp.substr(startIndex, endIndex - startIndex)); | |
98 }; | |
99 | |
100 // We use XMLHttpRequest and CORS to fetch JSONP rather than using script tags. | |
101 // That's better for security and performance, but we need the server to coopera
te | |
102 // by setting CORS headers. | |
103 net.jsonp = function(url) | |
104 { | |
105 return net.ajax({ | |
106 url: url, | |
107 }).then(function(jsonp) { | |
108 return net._parseJSONP(jsonp); | |
109 }).catch(function(error) { | |
110 return {}; | |
111 }); | |
112 }; | |
113 | |
114 })(); | |
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