1 files changed, 24 insertions, 0 deletions
diff --git a/chromium/fuchsia/cast_streaming/cast_streaming.cc b/chromium/fuchsia/cast_streaming/cast_streaming.cc
new file mode 100644
index 00000000000..2044900b05b
--- /dev/null
+++ b/chromium/fuchsia/cast_streaming/cast_streaming.cc
@@ -0,0 +1,24 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "fuchsia/cast_streaming/public/cast_streaming.h"
+
+#include "base/strings/string_piece.h"
+
+namespace cast_streaming {
+
+bool IsCastStreamingAppOrigin(base::StringPiece origin) {
+  constexpr char kCastStreamingMessagePortOrigin[] = "cast-streaming:receiver";
+  return origin == kCastStreamingMessagePortOrigin;
+}
+
+bool IsValidCastStreamingMessage(const fuchsia::web::WebMessage& message) {
+  // |message| should contain exactly one OutgoingTransferrable, with a single
+  // MessagePort.
+  return message.has_outgoing_transfer() &&
+         message.outgoing_transfer().size() == 1u &&
+         message.outgoing_transfer()[0].is_message_port();
+}
+
+}  // namespace cast_streaming