Add MessageChannel and tests

cobalt/browser/idl_files.gni

@@ -212,6 +212,7 @@ source_idl_files = [
   "//cobalt/web/event.idl",
   "//cobalt/web/event_listener.idl",
   "//cobalt/web/event_target.idl",
+  "//cobalt/web/message_channel.idl",
   "//cobalt/web/message_event.idl",
   "//cobalt/web/message_port.idl",
   "//cobalt/web/navigator_ua_data.idl",

cobalt/web/BUILD.gn

@@ -80,6 +80,8 @@ static_library("web") {
     "csp_violation_reporter.h",
     "environment_settings_helper.cc",
     "location_base.h",
+    "message_channel.cc",
+    "message_channel.h",
     "message_event.cc",
     "message_event.h",
     "message_port.cc",
@@ -184,6 +186,7 @@ target(gtest_target_type, "web_test") {
     "error_event_test.cc",
     "event_target_test.cc",
     "event_test.cc",
+    "message_channel_test.cc",
     "message_event_test.cc",
     "message_port_test.cc",
     "url_test.cc",

cobalt/web/message_channel.cc

@@ -0,0 +1,42 @@
+// Copyright 2023 The Cobalt Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "cobalt/web/message_channel.h"
+
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "base/memory/ref_counted.h"
+#include "base/task_runner.h"
+#include "cobalt/script/environment_settings.h"
+#include "cobalt/web/context.h"
+#include "cobalt/web/event.h"
+#include "cobalt/web/event_target.h"
+#include "cobalt/web/message_event.h"
+
+namespace cobalt {
+namespace web {
+
+MessageChannel::MessageChannel() {
+  port1_ = new MessagePort;
+  port2_ = new MessagePort;
+}
+
+}  // namespace web
+}  // namespace cobalt

cobalt/web/message_channel.h

@@ -0,0 +1,45 @@
+// Copyright 2023 The Cobalt Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef COBALT_WEB_MESSAGE_CHANNEL_H_
+#define COBALT_WEB_MESSAGE_CHANNEL_H_
+
+#include "cobalt/script/wrappable.h"
+#include "cobalt/web/message_port.h"
+
+namespace cobalt {
+namespace web {
+
+class MessageChannel : public script::Wrappable {
+ public:
+  MessageChannel();
+  ~MessageChannel() {}
+
+  MessageChannel(const MessageChannel&) = delete;
+  MessageChannel& operator=(const MessageChannel&) = delete;
+
+  const scoped_refptr<MessagePort>& port1() { return port1_; }
+  const scoped_refptr<MessagePort>& port2() { return port2_; }
+
+  DEFINE_WRAPPABLE_TYPE(MessageChannel);
+
+ private:
+  scoped_refptr<MessagePort> port1_;
+  scoped_refptr<MessagePort> port2_;
+};
+
+}  // namespace web
+}  // namespace cobalt
+
+#endif  // COBALT_WEB_MESSAGE_CHANNEL_H_

cobalt/web/message_channel.idl

@@ -0,0 +1,20 @@
+// Copyright 2023 The Cobalt Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// https://html.spec.whatwg.org/multipage/web-messaging.html#messagechannel
+// https://html.spec.whatwg.org/dev/web-messaging.html#message-ports
+[Constructor, Exposed = (Window,Worker)] interface MessageChannel {
+    readonly attribute MessagePort port1;
+    readonly attribute MessagePort port2;
+};

cobalt/web/message_channel_test.cc

@@ -0,0 +1,65 @@
+// Copyright 2023 The Cobalt Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "cobalt/web/message_channel.h"
+
+#include <string>
+
+#include "base/strings/string_util.h"
+#include "cobalt/web/testing/test_with_javascript.h"
+
+
+#define EXPECT_SUBSTRING(needle, haystack) \
+  EXPECT_PRED_FORMAT2(::testing::IsSubstring, (needle), (haystack))
+
+namespace cobalt {
+namespace web {
+
+namespace {
+class MessageChannelTestWithJavaScript : public testing::TestWebWithJavaScript {
+};
+}  // namespace
+
+TEST_P(MessageChannelTestWithJavaScript, MessageChannelIsConstructible) {
+  std::string result;
+  EXPECT_TRUE(EvaluateScript("var channel = new MessageChannel();", &result))
+      << "Failed to evaluate script.";
+  EXPECT_EQ("undefined", result) << result;
+}
+
+TEST_P(MessageChannelTestWithJavaScript, MessageChannelPort1IsMessagePort) {
+  std::string result;
+  EXPECT_TRUE(EvaluateScript(
+      "var channel = new MessageChannel(); channel.port1", &result))
+      << "Failed to evaluate script.";
+  EXPECT_NE("null", result) << result;
+  EXPECT_EQ("[object MessagePort]", result) << result;
+}
+
+TEST_P(MessageChannelTestWithJavaScript, MessageChannelPort2IsMessagePort) {
+  std::string result;
+  EXPECT_TRUE(EvaluateScript(
+      "var channel = new MessageChannel(); channel.port2", &result))
+      << "Failed to evaluate script.";
+  EXPECT_NE("null", result) << result;
+  EXPECT_EQ("[object MessagePort]", result) << result;
+}
+
+INSTANTIATE_TEST_CASE_P(
+    MessageChannelTestsWithJavaScript, MessageChannelTestWithJavaScript,
+    ::testing::ValuesIn(testing::TestWebWithJavaScript::GetWebTypes()),
+    testing::TestWebWithJavaScript::GetTypeName);
+
+}  // namespace web
+}  // namespace cobalt