aaac7fed
 liuqimichale
add
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'use strict';
var inherits = require('inherits')
, iframeUtils = require('../../utils/iframe')
, urlUtils = require('../../utils/url')
, EventEmitter = require('events').EventEmitter
, random = require('../../utils/random')
;
var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
debug = require('debug')('sockjs-client:receiver:htmlfile');
}
function HtmlfileReceiver(url) {
debug(url);
EventEmitter.call(this);
var self = this;
iframeUtils.polluteGlobalNamespace();
this.id = 'a' + random.string(6);
url = urlUtils.addQuery(url, 'c=' + decodeURIComponent(iframeUtils.WPrefix + '.' + this.id));
debug('using htmlfile', HtmlfileReceiver.htmlfileEnabled);
var constructFunc = HtmlfileReceiver.htmlfileEnabled ?
iframeUtils.createHtmlfile : iframeUtils.createIframe;
global[iframeUtils.WPrefix][this.id] = {
start: function() {
debug('start');
self.iframeObj.loaded();
}
, message: function(data) {
debug('message', data);
self.emit('message', data);
}
, stop: function() {
debug('stop');
self._cleanup();
self._close('network');
}
};
this.iframeObj = constructFunc(url, function() {
debug('callback');
self._cleanup();
self._close('permanent');
});
}
inherits(HtmlfileReceiver, EventEmitter);
HtmlfileReceiver.prototype.abort = function() {
debug('abort');
this._cleanup();
this._close('user');
};
HtmlfileReceiver.prototype._cleanup = function() {
debug('_cleanup');
if (this.iframeObj) {
this.iframeObj.cleanup();
this.iframeObj = null;
}
delete global[iframeUtils.WPrefix][this.id];
};
HtmlfileReceiver.prototype._close = function(reason) {
debug('_close', reason);
this.emit('close', null, reason);
this.removeAllListeners();
};
HtmlfileReceiver.htmlfileEnabled = false;
// obfuscate to avoid firewalls
var axo = ['Active'].concat('Object').join('X');
if (axo in global) {
try {
HtmlfileReceiver.htmlfileEnabled = !!new global[axo]('htmlfile');
} catch (x) {
// intentionally empty
}
}
HtmlfileReceiver.enabled = HtmlfileReceiver.htmlfileEnabled || iframeUtils.iframeEnabled;
module.exports = HtmlfileReceiver;
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