chrome/browser/usb/usb_tab_helper.h

// Copyright 2015 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.

#ifndef CHROME_BROWSER_USB_USB_TAB_HELPER_H_
#define CHROME_BROWSER_USB_USB_TAB_HELPER_H_

#include "base/containers/scoped_ptr_map.h"
#include "base/macros.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
#include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"

namespace device {
namespace usb {
class DeviceManager;
class PermissionProvider;
}
}

class WebUSBPermissionProvider;

// Per-tab owner of USB services provided to render frames within that tab.
class UsbTabHelper : public content::WebContentsObserver,
                     public content::WebContentsUserData<UsbTabHelper> {
 public:
  static UsbTabHelper* GetOrCreateForWebContents(
      content::WebContents* web_contents);

  ~UsbTabHelper() override;

  void CreateDeviceManager(
      content::RenderFrameHost* render_frame_host,
      mojo::InterfaceRequest<device::usb::DeviceManager> request);

 private:
  explicit UsbTabHelper(content::WebContents* web_contents);
  friend class content::WebContentsUserData<UsbTabHelper>;

  // content::WebContentsObserver overrides:
  void RenderFrameDeleted(content::RenderFrameHost* render_frame_host) override;

  void GetPermissionProvider(
      content::RenderFrameHost* render_frame_host,
      mojo::InterfaceRequest<device::usb::PermissionProvider> request);

  base::ScopedPtrMap<content::RenderFrameHost*,
                     scoped_ptr<WebUSBPermissionProvider>> permission_provider_;

  DISALLOW_COPY_AND_ASSIGN(UsbTabHelper);
};

#endif  // CHROME_BROWSER_USB_USB_TAB_HELPER_H_