browser: implement bluetooth chooser interface

atom/browser/api/atom_api_web_contents.cc

@@ -14,6 +14,7 @@
 #include "atom/browser/atom_browser_context.h"
 #include "atom/browser/atom_browser_main_parts.h"
 #include "atom/browser/atom_security_state_model_client.h"
+#include "atom/browser/bluetooth_chooser.h"
 #include "atom/browser/native_window.h"
 #include "atom/browser/net/atom_network_delegate.h"
 #include "atom/browser/web_contents_permission_helper.h"
@@ -504,6 +505,14 @@ void WebContents::RequestToLockMouse(
   permission_helper->RequestPointerLockPermission(user_gesture);
 }
 
+std::unique_ptr<content::BluetoothChooser> WebContents::RunBluetoothChooser(
+    content::RenderFrameHost* frame,
+    const content::BluetoothChooser::EventHandler& event_handler) {
+  std::unique_ptr<BluetoothChooser> bluetooth_chooser(
+      new BluetoothChooser(this, event_handler));
+  return std::move(bluetooth_chooser);
+}
+
 void WebContents::BeforeUnloadFired(const base::TimeTicks& proceed_time) {
   // Do nothing, we override this method just to avoid compilation error since
   // there are two virtual functions named BeforeUnloadFired.

atom/browser/api/atom_api_web_contents.h

@@ -211,6 +211,9 @@ class WebContents : public mate::TrackableObject<WebContents>,
       content::WebContents* web_contents,
       bool user_gesture,
       bool last_unlocked_by_target) override;
+  std::unique_ptr<content::BluetoothChooser> RunBluetoothChooser(
+      content::RenderFrameHost* frame,
+      const content::BluetoothChooser::EventHandler& handler) override;
 
   // content::WebContentsObserver:
   void BeforeUnloadFired(const base::TimeTicks& proceed_time) override;

atom/browser/bluetooth_chooser.cc

@@ -0,0 +1,107 @@
+// Copyright (c) 2016 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/bluetooth_chooser.h"
+#include "atom/common/native_mate_converters/callback.h"
+#include "atom/common/native_mate_converters/string16_converter.h"
+#include "native_mate/dictionary.h"
+
+namespace mate {
+
+template<>
+struct Converter<atom::BluetoothChooser::DeviceInfo> {
+  static v8::Local<v8::Value> ToV8(
+      v8::Isolate* isolate, const atom::BluetoothChooser::DeviceInfo& val) {
+    mate::Dictionary dict = mate::Dictionary::CreateEmpty(isolate);
+    dict.Set("deviceName", val.device_name);
+    dict.Set("deviceId", val.device_id);
+    return mate::ConvertToV8(isolate, dict);
+  }
+};
+
+}  // namespace mate
+
+namespace atom {
+
+namespace {
+
+const int kMaxScanRetries = 5;
+
+void OnDeviceChosen(
+    const content::BluetoothChooser::EventHandler& handler,
+    const std::string& device_id) {
+  if (device_id.empty()) {
+    handler.Run(content::BluetoothChooser::Event::CANCELLED, device_id);
+  } else {
+    handler.Run(content::BluetoothChooser::Event::SELECTED, device_id);
+  }
+}
+
+}  // namespace
+
+BluetoothChooser::BluetoothChooser(
+    api::WebContents* contents,
+    const EventHandler& event_handler)
+    : api_web_contents_(contents),
+      event_handler_(event_handler),
+      num_retries_(0) {
+}
+
+BluetoothChooser::~BluetoothChooser() {
+}
+
+void BluetoothChooser::SetAdapterPresence(AdapterPresence presence) {
+  switch (presence) {
+    case AdapterPresence::ABSENT:
+    case AdapterPresence::POWERED_OFF:
+      event_handler_.Run(Event::CANCELLED, "");
+      break;
+    case AdapterPresence::POWERED_ON:
+      break;
+  }
+}
+
+void BluetoothChooser::ShowDiscoveryState(DiscoveryState state) {
+  switch (state) {
+    case DiscoveryState::FAILED_TO_START:
+      event_handler_.Run(Event::CANCELLED, "");
+      break;
+    case DiscoveryState::IDLE:
+      if (device_list_.empty()) {
+        auto event = ++num_retries_ > kMaxScanRetries ? Event::CANCELLED
+                                                      : Event::RESCAN;
+        event_handler_.Run(event, "");
+      } else {
+        bool prevent_default =
+            api_web_contents_->Emit("select-bluetooth-device",
+                                    device_list_,
+                                    base::Bind(&OnDeviceChosen,
+                                               event_handler_));
+        if (!prevent_default) {
+          auto device_id = device_list_[0].device_id;
+          event_handler_.Run(Event::SELECTED, device_id);
+        }
+      }
+      break;
+    case DiscoveryState::DISCOVERING:
+      break;
+  }
+}
+
+void BluetoothChooser::AddDevice(const std::string& device_id,
+                                 const base::string16& device_name) {
+  DeviceInfo info = {device_id, device_name};
+  device_list_.push_back(info);
+}
+
+void BluetoothChooser::RemoveDevice(const std::string& device_id) {
+  for (auto it = device_list_.begin(); it != device_list_.end(); ++it) {
+    if (it->device_id == device_id) {
+      device_list_.erase(it);
+      return;
+    }
+  }
+}
+
+}  // namespace atom

atom/browser/bluetooth_chooser.h

@@ -0,0 +1,45 @@
+// Copyright (c) 2016 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_BLUETOOTH_CHOOSER_H_
+#define ATOM_BROWSER_BLUETOOTH_CHOOSER_H_
+
+#include <string>
+#include <vector>
+
+#include "atom/browser/api/atom_api_web_contents.h"
+#include "content/public/browser/bluetooth_chooser.h"
+
+namespace atom {
+
+class BluetoothChooser : public content::BluetoothChooser {
+ public:
+  struct DeviceInfo {
+    std::string device_id;
+    base::string16 device_name;
+  };
+
+  explicit BluetoothChooser(api::WebContents* contents,
+                            const EventHandler& handler);
+  ~BluetoothChooser() override;
+
+  // content::BluetoothChooser:
+  void SetAdapterPresence(AdapterPresence presence) override;
+  void ShowDiscoveryState(DiscoveryState state) override;
+  void AddDevice(const std::string& device_id,
+                 const base::string16& device_name) override;
+  void RemoveDevice(const std::string& device_id) override;
+
+ private:
+  std::vector<DeviceInfo> device_list_;
+  api::WebContents* api_web_contents_;
+  EventHandler event_handler_;
+  int num_retries_;
+
+  DISALLOW_COPY_AND_ASSIGN(BluetoothChooser);
+};
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_BLUETOOTH_CHOOSER_H_

filenames.gypi

@@ -167,6 +167,8 @@
       'atom/browser/atom_security_state_model_client.h',
       'atom/browser/atom_speech_recognition_manager_delegate.cc',
       'atom/browser/atom_speech_recognition_manager_delegate.h',
+      'atom/browser/bluetooth_chooser.cc',
+      'atom/browser/bluetooth_chooser.h',
       'atom/browser/bridge_task_runner.cc',
       'atom/browser/bridge_task_runner.h',
       'atom/browser/browser.cc',