chrome/browser/geolocation/geolocation_permission_context_android.h

// Copyright 2012 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_GEOLOCATION_GEOLOCATION_PERMISSION_CONTEXT_ANDROID_H_
#define CHROME_BROWSER_GEOLOCATION_GEOLOCATION_PERMISSION_CONTEXT_ANDROID_H_

// The flow for geolocation permissions on Android needs to take into account
// the global geolocation settings so it differs from the desktop one. It
// works as follows.
// GeolocationPermissionContextAndroid::DecidePermission intercepts the flow in
// the UI thread, and posts a task to the blocking pool to CheckSystemLocation.
// CheckSystemLocation will in fact check several possible settings
//     - The global system geolocation setting
//     - The Google location settings on pre KK devices
//     - An old internal Chrome setting on pre-JB MR1 devices
// With all that information it will decide if system location is enabled.
// If enabled, it proceeds with the per site flow via
// GeolocationPermissionContext (which will check per site permissions, create
// infobars, etc.).
//
// Otherwise the permission is already decided.

// There is a bit of thread jumping since some of the permissions (like the
// per site settings) are queried on the UI thread while the system level
// permissions are considered I/O and thus checked in the blocking thread pool.

#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/geolocation/geolocation_permission_context.h"
#include "components/content_settings/core/common/permission_request_id.h"
#include "url/gurl.h"

namespace content {
class WebContents;
}

class GoogleLocationSettingsHelper;

class GeolocationPermissionContextAndroid
    : public GeolocationPermissionContext {
 public:
  explicit GeolocationPermissionContextAndroid(Profile* profile);
  virtual ~GeolocationPermissionContextAndroid();

 private:
  struct PermissionRequestInfo {
    PermissionRequestInfo();

    PermissionRequestID id;
    GURL requesting_origin;
    GURL embedder_origin;
    bool user_gesture;
  };

  // PermissionContextBase:
  virtual void RequestPermission(
      content::WebContents* web_contents,
       const PermissionRequestID& id,
       const GURL& requesting_frame_origin,
       bool user_gesture,
       const BrowserPermissionCallback& callback) override;

  void CheckMasterLocation(content::WebContents* web_contents,
                           const PermissionRequestInfo& info,
                           const BrowserPermissionCallback& callback);

  void ProceedDecidePermission(content::WebContents* web_contents,
                               const PermissionRequestInfo& info,
                               base::Callback<void(bool)> callback);

  // Will perform a final check on the system location settings before
  // granting the permission.
  void InterceptPermissionCheck(const BrowserPermissionCallback& callback,
                                bool granted);

  scoped_ptr<GoogleLocationSettingsHelper> google_location_settings_helper_;
  base::WeakPtrFactory<GeolocationPermissionContextAndroid> weak_factory_;

 private:
  void CheckSystemLocation(content::WebContents* web_contents,
                           const PermissionRequestInfo& info,
                           base::Callback<void(bool)> callback);

  DISALLOW_COPY_AND_ASSIGN(GeolocationPermissionContextAndroid);
};

#endif  // CHROME_BROWSER_GEOLOCATION_GEOLOCATION_PERMISSION_CONTEXT_ANDROID_H_