Created
September 18, 2012 08:19
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VKontakte Audio Search
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| goog.provide('VKontakte'); | |
| goog.require('goog.crypt.Md5'); | |
| VKontakte = function (user_id, app_id, app_secret) { | |
| this.user_id_ = user_id; | |
| this.app_id_ = app_id; | |
| this.app_secret_ = app_secret; | |
| }; | |
| VKontakte.API_ENDPOINT = 'http://api.vk.com/api.php'; | |
| VKontakte.prototype.search = function (artist, track, callback) { | |
| var uri = this.getSearchURI_(artist, track); | |
| this.request_('GET', uri, function (status, response) { | |
| if (status === 0) { | |
| callback(new Error('No Internet connection'), null); | |
| } else { | |
| var result = response[1]; | |
| if (!result) { | |
| callback(new Error('No audio'), null); | |
| } else { | |
| callback(null, result.audio.url); | |
| } | |
| } | |
| }); | |
| }; | |
| VKontakte.prototype.getSearchURI_ = function (artist, track) { | |
| var q = artist + ' ' + track; | |
| var params = { | |
| 'method': 'audio.search', | |
| 'q': q.toLowerCase(), | |
| 'sort': 2, | |
| 'test_mode': 1, | |
| 'api_id': this.app_id_, | |
| 'format': 'json', | |
| 'count': 10 | |
| }; | |
| params['sig'] = this.generateApiRequestSignature_(params); | |
| return VKontakte.API_ENDPOINT + this.createSearchString_(params); | |
| }; | |
| VKontakte.prototype.generateApiRequestSignature_ = function (params) { | |
| var input = this.user_id_; | |
| // Keys are required to be ordered alphabetically. | |
| Object.keys(params).sort().forEach(function (key) { | |
| input += key + '=' + params[key]; | |
| }); | |
| input += this.app_secret_; | |
| var md5 = new goog.crypt.Md5(); | |
| md5.update(input); | |
| return md5.digest().map(function (digit) { | |
| return digit.toString(16); | |
| }).join(''); | |
| }; | |
| VKontakte.prototype.createSearchString_ = function (params) { | |
| var parts = []; | |
| var encode = window.encodeURIComponent; | |
| for (var key in params) { | |
| if (params.hasOwnProperty(key)) { | |
| parts.push(key + '=' + encode(params[key])); | |
| } | |
| } | |
| return '?' + parts.join('&'); | |
| }; | |
| VKontakte.prototype.request_ = function (method, uri, callback) { | |
| var xhr = new XMLHttpRequest(); | |
| xhr.open(method, uri, true); | |
| xhr.onreadystatechange = function () { | |
| if (xhr.readyState === 4) { | |
| var response = {}; | |
| try { | |
| response = JSON.parse(xhr.responseText); | |
| } finally { | |
| callback(xhr.statusCode, response.response || response); | |
| } | |
| } | |
| }; | |
| xhr.send(null); | |
| }; |
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