From 67fdec20726e48ba3a934cb25bb30d47ec4a4f29 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Yaroslav=20De=20La=20Pe=C3=B1a=20Smirnov?=
 <yaros.rus_89@live.com.mx>
Date: Wed, 29 Nov 2017 11:44:34 +0300
Subject: Initial commit, version 0.5.3

---
 .../engine.io/lib/transports/polling-jsonp.js      | 75 ++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 node_modules/engine.io/lib/transports/polling-jsonp.js

(limited to 'node_modules/engine.io/lib/transports/polling-jsonp.js')

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);
+};
-- 
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