chrome/browser/renderer_host/offline_resource_throttle.h

   1 // Copyright (c) 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_RENDERER_HOST_OFFLINE_RESOURCE_THROTTLE_H_
   6 #define CHROME_BROWSER_RENDERER_HOST_OFFLINE_RESOURCE_THROTTLE_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "chrome/browser/chromeos/offline/offline_load_page.h"
  13 #include "content/public/browser/resource_throttle.h"
  14 #include "net/base/completion_callback.h"
  15
  16 namespace content {
  17 class AppCacheService;
  18 }
  19
  20 namespace net {
  21 class URLRequest;
  22 }
  23 // Used to show an offline interstitial page when the network is not available.
  24 class OfflineResourceThrottle
  25     : public content::ResourceThrottle,
  26       public base::SupportsWeakPtr<OfflineResourceThrottle> {
  27  public:
  28   OfflineResourceThrottle(net::URLRequest* request,
  29                           content::AppCacheService* appcache_service);
  30   virtual ~OfflineResourceThrottle();
  31
  32   // content::ResourceThrottle implementation:
  33   virtual void WillStartRequest(bool* defer) OVERRIDE;
  34   virtual const char* GetNameForLogging() const OVERRIDE;
  35
  36  private:
  37   // OfflineLoadPage callback.
  38   void OnBlockingPageComplete(bool proceed);
  39
  40   // Erase the state associated with a deferred load request.
  41   void ClearRequestInfo();
  42   bool IsRemote(const GURL& url) const;
  43
  44   // True if chrome should show the offline page.
  45   bool ShouldShowOfflinePage(const GURL& url) const;
  46
  47   // A callback to tell if an appcache exists.
  48   void OnCanHandleOfflineComplete(int rv);
  49
  50   net::URLRequest* request_;
  51   // Safe to keep a pointer around since AppCacheService outlives all requests.
  52   content::AppCacheService* appcache_service_;
  53   net::CancelableCompletionCallback appcache_completion_callback_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(OfflineResourceThrottle);
  56 };
  57
  58 #endif  // CHROME_BROWSER_RENDERER_HOST_OFFLINE_RESOURCE_THROTTLE_H_