Add a Physical Web WebUI

ios/chrome/browser/ui/webui/physical_web_ui.cc

+// Copyright 2016 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 "ios/chrome/browser/ui/webui/physical_web_ui.h"
+
+#include "base/bind.h"
+#include "base/macros.h"
+#include "base/metrics/user_metrics.h"
+#include "base/values.h"
+#include "components/grit/components_resources.h"
+#include "components/physical_web/data_source/physical_web_data_source.h"
+#include "components/physical_web/webui/physical_web_ui_constants.h"
+#include "components/strings/grit/components_strings.h"
+#include "ios/chrome/browser/application_context.h"
+#include "ios/chrome/browser/browser_state/chrome_browser_state.h"
+#include "ios/chrome/browser/chrome_url_constants.h"
+#include "ios/web/public/web_ui_ios_data_source.h"
+#include "ios/web/public/webui/web_ui_ios.h"
+#include "ios/web/public/webui/web_ui_ios_message_handler.h"
+
+namespace {
+
+web::WebUIIOSDataSource* CreatePhysicalWebUIDataSource() {
+  web::WebUIIOSDataSource* html_source =
+      web::WebUIIOSDataSource::Create(kChromeUIPhysicalWebHost);
+
+  // Localized and data strings.
+  html_source->AddLocalizedString(physical_web_ui::kTitle,
+                                  IDS_PHYSICAL_WEB_UI_TITLE);
+
+  html_source->SetJsonPath("strings.js");
+  html_source->AddResourcePath(physical_web_ui::kPhysicalWebJS,
+                               IDR_PHYSICAL_WEB_UI_JS);
+  html_source->AddResourcePath(physical_web_ui::kPhysicalWebCSS,
+                               IDR_PHYSICAL_WEB_UI_CSS);
+  html_source->SetDefaultResource(IDR_PHYSICAL_WEB_UI_HTML);
+  return html_source;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// PhysicalWebDOMHandler
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// The handler for Javascript messages for the chrome:physical-web page.
+class PhysicalWebDOMHandler : public web::WebUIIOSMessageHandler {
+ public:
+  PhysicalWebDOMHandler() {}
+  ~PhysicalWebDOMHandler() override {}
+
+  void RegisterMessages() override;
+
+  void HandleRequestNearbyURLs(const base::ListValue* args);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PhysicalWebDOMHandler);
+};
+
+void PhysicalWebDOMHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      physical_web_ui::kRequestNearbyUrls,
+      base::Bind(&PhysicalWebDOMHandler::HandleRequestNearbyURLs,
+                 base::Unretained(this)));
+}
+
+void PhysicalWebDOMHandler::HandleRequestNearbyURLs(
+    const base::ListValue* args) {
+  base::DictionaryValue results;
+
+  std::unique_ptr<base::ListValue> metadata =
+      GetApplicationContext()->GetPhysicalWebDataSource()->GetMetadata();
+
+  results.Set(physical_web_ui::kMetadata, metadata.release());
+
+  web_ui()->CallJavascriptFunction(physical_web_ui::kReturnNearbyUrls, results);
+}
+
+}  // namespace
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// PhysicalWebUI
+//
+////////////////////////////////////////////////////////////////////////////////
+
+PhysicalWebUI::PhysicalWebUI(web::WebUIIOS* web_ui)
+    : web::WebUIIOSController(web_ui) {
+  PhysicalWebDOMHandler* handler = new PhysicalWebDOMHandler();
+  web_ui->AddMessageHandler(handler);
+
+  web::WebUIIOSDataSource::Add(ios::ChromeBrowserState::FromWebUIIOS(web_ui),
+                               CreatePhysicalWebUIDataSource());
+
+  base::RecordAction(base::UserMetricsAction("PhysicalWeb.WebUI.Open"));
+}
+
+PhysicalWebUI::~PhysicalWebUI() {}