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      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 appcache {
     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                           appcache::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   appcache::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_
     59