Generate random stream id instead of using the one from engine io.

lib/transport/engine.io/common.js

@@ -18,13 +18,12 @@ exports.createStream = function createStream(socket) {
     stream.remoteAddress = socket.hostname
   } else if (socket.request) {
     // server side connection socket
+    stream.id = getSocketID(socket.id)
     stream.socket = socket
-    stream.id = socket.id
+    stream.headers = socket.request.headers
     stream.localPort = socket.request.connection.localPort
     // Use id as remotePort if we don't have that information
-    var remotePort = socket.request.connection.remotePort
-    stream.remotePort = remotePort || socket.id
-    stream.headers = socket.request.headers
+    stream.remotePort = socket.request.connection.remotePort || socket.id
   }
 
   //
@@ -83,3 +82,17 @@ exports.createStream = function createStream(socket) {
 
   return stream
 }
+
+
+var crypto = require('cry' + 'pto')
+/**
+ * Private function for generating random server side stream id.
+ */
+function getSocketID(seed) {
+  var rnd = crypto.randomBytes(128)
+  return crypto.createHash('sha256')
+    .update(rnd)
+    .update(seed)
+    .update(String(Math.random()))
+    .digest('base64')
+}