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183 lines
5.4 KiB
183 lines
5.4 KiB
'use strict';
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var utils = require('../../utils/iframe')
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, random = require('../../utils/random')
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, browser = require('../../utils/browser')
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, urlUtils = require('../../utils/url')
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, inherits = require('inherits')
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, EventEmitter = require('events').EventEmitter
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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:jsonp');
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}
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function JsonpReceiver(url) {
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debug(url);
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var self = this;
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EventEmitter.call(this);
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utils.polluteGlobalNamespace();
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this.id = 'a' + random.string(6);
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var urlWithId = urlUtils.addQuery(url, 'c=' + encodeURIComponent(utils.WPrefix + '.' + this.id));
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global[utils.WPrefix][this.id] = this._callback.bind(this);
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this._createScript(urlWithId);
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// Fallback mostly for Konqueror - stupid timer, 35 seconds shall be plenty.
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this.timeoutId = setTimeout(function() {
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debug('timeout');
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self._abort(new Error('JSONP script loaded abnormally (timeout)'));
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}, JsonpReceiver.timeout);
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}
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inherits(JsonpReceiver, EventEmitter);
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JsonpReceiver.prototype.abort = function() {
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debug('abort');
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if (global[utils.WPrefix][this.id]) {
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var err = new Error('JSONP user aborted read');
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err.code = 1000;
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this._abort(err);
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}
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};
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JsonpReceiver.timeout = 35000;
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JsonpReceiver.scriptErrorTimeout = 1000;
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JsonpReceiver.prototype._callback = function(data) {
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debug('_callback', data);
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this._cleanup();
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if (this.aborting) {
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return;
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}
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if (data) {
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debug('message', data);
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this.emit('message', data);
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}
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this.emit('close', null, 'network');
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this.removeAllListeners();
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};
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JsonpReceiver.prototype._abort = function(err) {
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debug('_abort', err);
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this._cleanup();
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this.aborting = true;
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this.emit('close', err.code, err.message);
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this.removeAllListeners();
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};
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JsonpReceiver.prototype._cleanup = function() {
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debug('_cleanup');
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clearTimeout(this.timeoutId);
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if (this.script2) {
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this.script2.parentNode.removeChild(this.script2);
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this.script2 = null;
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}
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if (this.script) {
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var script = this.script;
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// Unfortunately, you can't really abort script loading of
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// the script.
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script.parentNode.removeChild(script);
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script.onreadystatechange = script.onerror =
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script.onload = script.onclick = null;
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this.script = null;
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}
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delete global[utils.WPrefix][this.id];
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};
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JsonpReceiver.prototype._scriptError = function() {
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debug('_scriptError');
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var self = this;
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if (this.errorTimer) {
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return;
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}
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this.errorTimer = setTimeout(function() {
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if (!self.loadedOkay) {
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self._abort(new Error('JSONP script loaded abnormally (onerror)'));
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}
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}, JsonpReceiver.scriptErrorTimeout);
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};
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JsonpReceiver.prototype._createScript = function(url) {
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debug('_createScript', url);
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var self = this;
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var script = this.script = global.document.createElement('script');
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var script2; // Opera synchronous load trick.
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script.id = 'a' + random.string(8);
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script.src = url;
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script.type = 'text/javascript';
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script.charset = 'UTF-8';
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script.onerror = this._scriptError.bind(this);
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script.onload = function() {
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debug('onload');
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self._abort(new Error('JSONP script loaded abnormally (onload)'));
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};
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// IE9 fires 'error' event after onreadystatechange or before, in random order.
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// Use loadedOkay to determine if actually errored
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script.onreadystatechange = function() {
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debug('onreadystatechange', script.readyState);
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if (/loaded|closed/.test(script.readyState)) {
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if (script && script.htmlFor && script.onclick) {
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self.loadedOkay = true;
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try {
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// In IE, actually execute the script.
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script.onclick();
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} catch (x) {
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// intentionally empty
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}
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}
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if (script) {
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self._abort(new Error('JSONP script loaded abnormally (onreadystatechange)'));
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}
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}
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};
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// IE: event/htmlFor/onclick trick.
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// One can't rely on proper order for onreadystatechange. In order to
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// make sure, set a 'htmlFor' and 'event' properties, so that
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// script code will be installed as 'onclick' handler for the
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// script object. Later, onreadystatechange, manually execute this
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// code. FF and Chrome doesn't work with 'event' and 'htmlFor'
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// set. For reference see:
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// http://jaubourg.net/2010/07/loading-script-as-onclick-handler-of.html
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// Also, read on that about script ordering:
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// http://wiki.whatwg.org/wiki/Dynamic_Script_Execution_Order
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if (typeof script.async === 'undefined' && global.document.attachEvent) {
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// According to mozilla docs, in recent browsers script.async defaults
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// to 'true', so we may use it to detect a good browser:
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// https://developer.mozilla.org/en/HTML/Element/script
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if (!browser.isOpera()) {
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// Naively assume we're in IE
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try {
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script.htmlFor = script.id;
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script.event = 'onclick';
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} catch (x) {
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// intentionally empty
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}
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script.async = true;
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} else {
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// Opera, second sync script hack
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script2 = this.script2 = global.document.createElement('script');
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script2.text = "try{var a = document.getElementById('" + script.id + "'); if(a)a.onerror();}catch(x){};";
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script.async = script2.async = false;
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}
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}
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if (typeof script.async !== 'undefined') {
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script.async = true;
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}
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var head = global.document.getElementsByTagName('head')[0];
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head.insertBefore(script, head.firstChild);
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if (script2) {
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head.insertBefore(script2, head.firstChild);
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}
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};
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module.exports = JsonpReceiver;
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