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      1 // Copyright 2014 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_THUMBNAILS_THUMBNAIL_LIST_SOURCE_H_
      6 #define CHROME_BROWSER_THUMBNAILS_THUMBNAIL_LIST_SOURCE_H_
      7 
      8 #include <string>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/memory/ref_counted.h"
     12 #include "base/memory/weak_ptr.h"
     13 #include "components/history/core/browser/history_types.h"
     14 #include "content/public/browser/url_data_source.h"
     15 
     16 class Profile;
     17 
     18 namespace base {
     19 class RefCountedMemory;
     20 }
     21 
     22 namespace thumbnails {
     23 class ThumbnailService;
     24 }
     25 
     26 // ThumbnailListSource renders a webpage to list all thumbnails stored in
     27 // TopSites, along with all associated URLs. The thumbnail images are embedded
     28 // into the HTML via Base64, so we can easily produce a dump of TopSites and
     29 // the thumbnails it stores.
     30 class ThumbnailListSource : public content::URLDataSource {
     31  public:
     32   explicit ThumbnailListSource(Profile* profile);
     33 
     34   // content::URLDataSource implementation.
     35   virtual std::string GetSource() const OVERRIDE;
     36   virtual void StartDataRequest(
     37       const std::string& path,
     38       int render_process_id,
     39       int render_frame_id,
     40       const content::URLDataSource::GotDataCallback& callback) OVERRIDE;
     41   virtual std::string GetMimeType(const std::string& path) const OVERRIDE;
     42   virtual base::MessageLoop* MessageLoopForRequestPath(
     43       const std::string& path) const OVERRIDE;
     44   virtual bool ShouldServiceRequest(
     45       const net::URLRequest* request) const OVERRIDE;
     46   virtual bool ShouldReplaceExistingSource() const OVERRIDE;
     47 
     48  private:
     49   virtual ~ThumbnailListSource();
     50 
     51   void OnMostVisitedURLsAvailable(
     52     const content::URLDataSource::GotDataCallback& callback,
     53     const history::MostVisitedURLList& mvurl_list);
     54 
     55   // ThumbnailService.
     56   scoped_refptr<thumbnails::ThumbnailService> thumbnail_service_;
     57 
     58   // Only used when servicing requests on the UI thread.
     59   Profile* const profile_;
     60 
     61   // For callbacks may be run after destruction.
     62   base::WeakPtrFactory<ThumbnailListSource> weak_ptr_factory_;
     63 
     64   DISALLOW_COPY_AND_ASSIGN(ThumbnailListSource);
     65 };
     66 
     67 
     68 #endif  // CHROME_BROWSER_THUMBNAILS_THUMBNAIL_LIST_SOURCE_H_
     69