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87 lines
2.2 KiB
87 lines
2.2 KiB
'use strict';
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var inherits = require('inherits')
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, iframeUtils = require('../../utils/iframe')
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, urlUtils = require('../../utils/url')
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, EventEmitter = require('events').EventEmitter
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, random = require('../../utils/random')
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;
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var debug = function() {};
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if (process.env.NODE_ENV !== 'production') {
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debug = require('debug')('sockjs-client:receiver:htmlfile');
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}
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function HtmlfileReceiver(url) {
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debug(url);
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EventEmitter.call(this);
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var self = this;
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iframeUtils.polluteGlobalNamespace();
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this.id = 'a' + random.string(6);
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url = urlUtils.addQuery(url, 'c=' + decodeURIComponent(iframeUtils.WPrefix + '.' + this.id));
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debug('using htmlfile', HtmlfileReceiver.htmlfileEnabled);
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var constructFunc = HtmlfileReceiver.htmlfileEnabled ?
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iframeUtils.createHtmlfile : iframeUtils.createIframe;
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global[iframeUtils.WPrefix][this.id] = {
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start: function() {
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debug('start');
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self.iframeObj.loaded();
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}
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, message: function(data) {
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debug('message', data);
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self.emit('message', data);
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}
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, stop: function() {
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debug('stop');
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self._cleanup();
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self._close('network');
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}
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};
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this.iframeObj = constructFunc(url, function() {
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debug('callback');
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self._cleanup();
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self._close('permanent');
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});
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}
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inherits(HtmlfileReceiver, EventEmitter);
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HtmlfileReceiver.prototype.abort = function() {
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debug('abort');
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this._cleanup();
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this._close('user');
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};
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HtmlfileReceiver.prototype._cleanup = function() {
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debug('_cleanup');
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if (this.iframeObj) {
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this.iframeObj.cleanup();
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this.iframeObj = null;
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}
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delete global[iframeUtils.WPrefix][this.id];
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};
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HtmlfileReceiver.prototype._close = function(reason) {
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debug('_close', reason);
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this.emit('close', null, reason);
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this.removeAllListeners();
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};
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HtmlfileReceiver.htmlfileEnabled = false;
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// obfuscate to avoid firewalls
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var axo = ['Active'].concat('Object').join('X');
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if (axo in global) {
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try {
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HtmlfileReceiver.htmlfileEnabled = !!new global[axo]('htmlfile');
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} catch (x) {
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// intentionally empty
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}
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}
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HtmlfileReceiver.enabled = HtmlfileReceiver.htmlfileEnabled || iframeUtils.iframeEnabled;
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module.exports = HtmlfileReceiver;
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