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author | Yaroslav De La Peña Smirnov <yaros.rus_89@live.com.mx> | 2017-11-29 11:44:34 +0300 |
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committer | Yaroslav De La Peña Smirnov <yaros.rus_89@live.com.mx> | 2017-11-29 11:44:34 +0300 |
commit | 67fdec20726e48ba3a934cb25bb30d47ec4a4f29 (patch) | |
tree | 37fd9f4f0b0c20103e1646fc83021e4765de3680 /node_modules/engine.io/lib/transports/polling-jsonp.js | |
download | spanish-checkers-67fdec20726e48ba3a934cb25bb30d47ec4a4f29.tar.gz spanish-checkers-67fdec20726e48ba3a934cb25bb30d47ec4a4f29.zip |
Initial commit, version 0.5.3
Diffstat (limited to 'node_modules/engine.io/lib/transports/polling-jsonp.js')
-rw-r--r-- | node_modules/engine.io/lib/transports/polling-jsonp.js | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/node_modules/engine.io/lib/transports/polling-jsonp.js b/node_modules/engine.io/lib/transports/polling-jsonp.js new file mode 100644 index 0000000..62e66e7 --- /dev/null +++ b/node_modules/engine.io/lib/transports/polling-jsonp.js @@ -0,0 +1,75 @@ + +/** + * Module dependencies. + */ + +var Polling = require('./polling'); +var qs = require('querystring'); +var rDoubleSlashes = /\\\\n/g; +var rSlashes = /(\\)?\\n/g; +var util = require('util'); + +/** + * Module exports. + */ + +module.exports = JSONP; + +/** + * JSON-P polling transport. + * + * @api public + */ + +function JSONP (req) { + Polling.call(this, req); + + this.head = '___eio[' + (req._query.j || '').replace(/[^0-9]/g, '') + ']('; + this.foot = ');'; +} + +/** + * Inherits from Polling. + */ + +util.inherits(JSONP, Polling); + +/** + * Handles incoming data. + * Due to a bug in \n handling by browsers, we expect a escaped string. + * + * @api private + */ + +JSONP.prototype.onData = function (data) { + // we leverage the qs module so that we get built-in DoS protection + // and the fast alternative to decodeURIComponent + data = qs.parse(data).d; + if ('string' === typeof data) { + // client will send already escaped newlines as \\\\n and newlines as \\n + // \\n must be replaced with \n and \\\\n with \\n + data = data.replace(rSlashes, function (match, slashes) { + return slashes ? match : '\n'; + }); + Polling.prototype.onData.call(this, data.replace(rDoubleSlashes, '\\n')); + } +}; + +/** + * Performs the write. + * + * @api private + */ + +JSONP.prototype.doWrite = function (data, options, callback) { + // we must output valid javascript, not valid json + // see: http://timelessrepo.com/json-isnt-a-javascript-subset + var js = JSON.stringify(data) + .replace(/\u2028/g, '\\u2028') + .replace(/\u2029/g, '\\u2029'); + + // prepare response + data = this.head + js + this.foot; + + Polling.prototype.doWrite.call(this, data, options, callback); +}; |