Adding Angular and dependent packages for testing

third_party/pkg/angular/playback_middleware/lib/middleware.js

Index: third_party/pkg/angular/playback_middleware/lib/middleware.js
diff --git a/third_party/pkg/angular/playback_middleware/lib/middleware.js b/third_party/pkg/angular/playback_middleware/lib/middleware.js
new file mode 100644
index 0000000000000000000000000000000000000000..09382e1f35b9e3fc3760a753e8edb3bb1a791d4f
--- /dev/null
+++ b/third_party/pkg/angular/playback_middleware/lib/middleware.js
@@ -0,0 +1,50 @@
+
+var url = require('url');
+var playback = require('./playback.js');
+
+/**
+ * Returns connect middleware that will record and playback for Angular.dart's
+ * HTTP playback service.
+ * @param opts
+ *    path is the path where the record / playback endpoint is served
+ *    playbackImpl is the playback module, used for mocking
+ * @returns {Function}
+ */
+function endpoint(opts) {
+  opts = opts || {};
+  opts.path = opts.path || '/record';
+  opts.playbackImpl = opts.playbackImpl || playback.playback();
+
+
+  return function playbackEndpoint(req, res, next) {
+    if (url.parse(req.url).path != opts.path) {
+      next();
+      return;
+    }
+
+    if (req.method == 'POST') {
+      var body = '';
+      req.on('data', function(data) {
+        body += data;
+      });
+      req.on('end', function() {
+        var parsedBody = JSON.parse(body);
+
+        opts.playbackImpl.record(parsedBody.key, parsedBody.data);
+        res.writeHead(200);
+        res.end();
+      });
+    } else if (req.method == 'GET') {
+      var data = opts.playbackImpl.playback();
+      res.writeHead(200, {
+        'Content-Type': 'application/dart',
+        'Content-Length': Buffer.byteLength(data)
+      });
+      res.end(data);
+    }
+  }
+}
+
+module.exports = {
+  endpoint: endpoint
+};