migrate to ProviderEngine zero-client

1 files changed, 53 insertions, 0 deletions

diff --git a/app/scripts/lib/local-message-stream.js b/app/scripts/lib/local-message-stream.js
new file mode 100644
index 000000000..42d193e04
--- /dev/null
+++ b/app/scripts/lib/local-message-stream.js
@@ -0,0 +1,53 @@
+const Duplex = require('readable-stream').Duplex
+const inherits = require('util').inherits
+
+module.exports = LocalMessageDuplexStream
+
+
+inherits(LocalMessageDuplexStream, Duplex)
+
+function LocalMessageDuplexStream(opts){
+  Duplex.call(this, {
+    objectMode: true,
+  })
+
+  // this._origin = opts.origin
+  this._name = opts.name
+  this._target = opts.target
+
+  // console.log('LocalMessageDuplexStream ('+this._name+') - initialized...')
+  window.addEventListener('message', this._onMessage.bind(this), false)
+}
+
+// private
+
+LocalMessageDuplexStream.prototype._onMessage = function(event){
+  var msg = event.data
+  // console.log('LocalMessageDuplexStream ('+this._name+') - heard message...')
+  // validate message
+  if (event.origin !== location.origin) return //console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (event.origin !== location.origin) ')
+  if (typeof msg !== 'object') return //console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (typeof msg !== "object") ')
+  if (msg.target !== this._name) return //console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (msg.target !== this._name) ', msg.target, this._name)
+  if (!msg.data) return //console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (!msg.data) ')
+  // console.log('LocalMessageDuplexStream ('+this._name+') - accepted', msg.data)
+  // forward message
+  this.push(msg.data)
+}
+
+// stream plumbing
+
+LocalMessageDuplexStream.prototype._read = noop
+
+LocalMessageDuplexStream.prototype._write = function(data, encoding, cb){
+  // console.log('LocalMessageDuplexStream ('+this._name+') - sending message...')
+  var message = {
+    target: this._target,
+    data: data,
+  }
+  window.postMessage(message, location.origin)
+  cb()
+}
+
+// util
+
+function noop(){}
\ No newline at end of file