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      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/geolocation/geolocation_permission_context.h"
     29 #include "components/content_settings/core/common/permission_request_id.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_
     81