98 lines
1.7 KiB
JavaScript
98 lines
1.7 KiB
JavaScript
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/*!
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* socket.io-node
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* Copyright(c) 2011 LearnBoost <dev@learnboost.com>
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* MIT Licensed
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*/
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/**
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* Module requirements.
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*/
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var HTTPPolling = require('./http-polling');
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var jsonpolling_re = /^\d+$/
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/**
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* Export the constructor.
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*/
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exports = module.exports = JSONPPolling;
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/**
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* JSON-P polling transport.
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*
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* @api public
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*/
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function JSONPPolling (mng, data, req) {
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HTTPPolling.call(this, mng, data, req);
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this.head = 'io.j[0](';
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this.foot = ');';
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if (data.query.i && jsonpolling_re.test(data.query.i)) {
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this.head = 'io.j[' + data.query.i + '](';
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}
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};
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/**
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* Inherits from Transport.
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*/
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JSONPPolling.prototype.__proto__ = HTTPPolling.prototype;
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/**
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* Transport name
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*
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* @api public
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*/
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JSONPPolling.prototype.name = 'jsonppolling';
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/**
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* Make sure POST are decoded.
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*/
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JSONPPolling.prototype.postEncoded = true;
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/**
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* Handles incoming data.
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* Due to a bug in \n handling by browsers, we expect a JSONified string.
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*
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* @api private
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*/
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JSONPPolling.prototype.onData = function (data) {
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try {
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data = JSON.parse(data);
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} catch (e) {
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this.error('parse', 'reconnect');
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return;
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}
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HTTPPolling.prototype.onData.call(this, data);
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};
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/**
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* Performs the write.
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*
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* @api private
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*/
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JSONPPolling.prototype.doWrite = function (data) {
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HTTPPolling.prototype.doWrite.call(this);
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var data = data === undefined
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? '' : this.head + JSON.stringify(data) + this.foot;
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this.response.writeHead(200, {
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'Content-Type': 'text/javascript; charset=UTF-8'
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, 'Content-Length': Buffer.byteLength(data)
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, 'Connection': 'Keep-Alive'
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, 'X-XSS-Protection': '0'
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});
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this.response.write(data);
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this.log.debug(this.name + ' writing', data);
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};
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