chrome/browser/geolocation/geolocation_permission_context_android.h

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_GEOLOCATION_GEOLOCATION_PERMISSION_CONTEXT_ANDROID_H_
   6 #define CHROME_BROWSER_GEOLOCATION_GEOLOCATION_PERMISSION_CONTEXT_ANDROID_H_
   7
   8 // The flow for geolocation permissions on Android needs to take into account
   9 // the global geolocation settings so it differs from the desktop one. It
  10 // works as follows.
  11 // GeolocationPermissionContextAndroid::DecidePermission intercepts the flow in
  12 // the UI thread, and posts a task to the blocking pool to CheckSystemLocation.
  13 // CheckSystemLocation will in fact check several possible settings
  14 //     - The global system geolocation setting
  15 //     - The Google location settings on pre KK devices
  16 //     - An old internal Chrome setting on pre-JB MR1 devices
  17 // With all that information it will decide if system location is enabled.
  18 // If enabled, it proceeds with the per site flow via
  19 // GeolocationPermissionContext (which will check per site permissions, create
  20 // infobars, etc.).
  21 //
  22 // Otherwise the permission is already decided.
  23
  24 // There is a bit of thread jumping since some of the permissions (like the
  25 // per site settings) are queried on the UI thread while the system level
  26 // permissions are considered I/O and thus checked in the blocking thread pool.
  27
  28 #include "chrome/browser/content_settings/permission_request_id.h"
  29 #include "chrome/browser/geolocation/geolocation_permission_context.h"
  30 #include "url/gurl.h"
  31
  32 namespace content {
  33 class WebContents;
  34 }
  35
  36 class GoogleLocationSettingsHelper;
  37
  38
  39 class GeolocationPermissionContextAndroid
  40     : public GeolocationPermissionContext {
  41  public:
  42   explicit GeolocationPermissionContextAndroid(Profile* profile);
  43
  44  private:
  45   struct PermissionRequestInfo {
  46     PermissionRequestInfo();
  47
  48     PermissionRequestID id;
  49     GURL requesting_frame;
  50     bool user_gesture;
  51     GURL embedder;
  52   };
  53
  54   friend class GeolocationPermissionContext;
  55
  56   virtual ~GeolocationPermissionContextAndroid();
  57
  58   // GeolocationPermissionContext implementation:
  59   virtual void DecidePermission(content::WebContents* web_contents,
  60                                 const PermissionRequestID& id,
  61                                 const GURL& requesting_frame,
  62                                 bool user_gesture,
  63                                 const GURL& embedder,
  64                                 base::Callback<void(bool)> callback) OVERRIDE;
  65
  66   void ProceedDecidePermission(content::WebContents* web_contents,
  67                                const PermissionRequestInfo& info,
  68                                base::Callback<void(bool)> callback);
  69
  70   scoped_ptr<GoogleLocationSettingsHelper> google_location_settings_helper_;
  71
  72  private:
  73   void CheckSystemLocation(content::WebContents* web_contents,
  74                            const PermissionRequestInfo& info,
  75                            base::Callback<void(bool)> callback);
  76
  77   DISALLOW_COPY_AND_ASSIGN(GeolocationPermissionContextAndroid);
  78 };
  79
  80 #endif  // CHROME_BROWSER_GEOLOCATION_GEOLOCATION_PERMISSION_CONTEXT_ANDROID_H_