76 lines
1.6 KiB
JavaScript
76 lines
1.6 KiB
JavaScript
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/**
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* Module dependencies.
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*/
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var Polling = require('./polling');
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var qs = require('querystring');
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var rDoubleSlashes = /\\\\n/g;
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var rSlashes = /(\\)?\\n/g;
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var util = require('util');
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/**
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* Module exports.
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*/
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module.exports = JSONP;
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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 JSONP (req) {
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Polling.call(this, req);
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this.head = '___eio[' + (req._query.j || '').replace(/[^0-9]/g, '') + '](';
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this.foot = ');';
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}
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/**
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* Inherits from Polling.
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*/
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util.inherits(JSONP, Polling);
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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 escaped string.
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*
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* @api private
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*/
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JSONP.prototype.onData = function (data) {
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// we leverage the qs module so that we get built-in DoS protection
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// and the fast alternative to decodeURIComponent
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data = qs.parse(data).d;
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if ('string' === typeof data) {
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// client will send already escaped newlines as \\\\n and newlines as \\n
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// \\n must be replaced with \n and \\\\n with \\n
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data = data.replace(rSlashes, function (match, slashes) {
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return slashes ? match : '\n';
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});
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Polling.prototype.onData.call(this, data.replace(rDoubleSlashes, '\\n'));
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}
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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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JSONP.prototype.doWrite = function (data, options, callback) {
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// we must output valid javascript, not valid json
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// see: http://timelessrepo.com/json-isnt-a-javascript-subset
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var js = JSON.stringify(data)
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.replace(/\u2028/g, '\\u2028')
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.replace(/\u2029/g, '\\u2029');
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// prepare response
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data = this.head + js + this.foot;
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Polling.prototype.doWrite.call(this, data, options, callback);
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};
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