Show offline interstitial page when offline and reload when reconnected to network.

chrome/browser/renderer_host/offline_resource_handler.h

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_RENDERER_HOST_OFFLINE_RESOURCE_HANDLER_H_
+#define CHROME_BROWSER_RENDERER_HOST_OFFLINE_RESOURCE_HANDLER_H_
+
+#include <string>
+
+#include "base/ref_counted.h"
+#include "chrome/browser/chromeos/offline/offline_load_page.h"
+#include "chrome/browser/renderer_host/resource_handler.h"
+
+class MessageLoop;
+class ResourceDispatcherHost;
+class URLRequest;
+
+// Used to show an offline interstitial page when the network is not available.
+class OfflineResourceHandler : public ResourceHandler,
+                               public chromeos::OfflineLoadPage::Delegate {
+ public:
+  OfflineResourceHandler(ResourceHandler* handler,
+                         int host_id,
+                         int render_view_id,
+                         ResourceDispatcherHost* rdh,
+                         URLRequest* request);
+  ~OfflineResourceHandler() {}
+
+  // ResourceHandler implementation:
+  virtual bool OnUploadProgress(int request_id, uint64 position, uint64 size);
+  virtual bool OnRequestRedirected(int request_id, const GURL& new_url,
+                           ResourceResponse* response, bool* defer);
+  virtual bool OnResponseStarted(int request_id, ResourceResponse* response);
+  virtual bool OnWillStart(int request_id, const GURL& url, bool* defer);
+  virtual bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
+                          int min_size);
+  virtual bool OnReadCompleted(int request_id, int* bytes_read);
+  virtual bool OnResponseCompleted(int request_id,
+                                   const URLRequestStatus& status,
+                                   const std::string& security_info);
+  virtual void OnRequestClosed();
+
+  // chromeos::OfflineLoadPage::Delegate
+  virtual void OnBlockingPageComplete(bool proceed);
+
+ private:
+  // Erease the state assocaited with a deferred load request.
+  void ClearRequestInfo();
+  bool IsRemote(const GURL& url) const;
+
+  // Resume the deferred load request.
+  void Resume();
+
+  // Tells if chrome should show the offline page.
+  bool ShouldShowOfflinePage(const GURL& url) const;
+
+  // Shows the offline interstitinal page in UI thread.
+  void ShowOfflinePage();
+
+  scoped_refptr<ResourceHandler> next_handler_;
+
+  int process_host_id_;
+  int render_view_id_;
+  ResourceDispatcherHost* rdh_;
+  URLRequest* request_;
+
+  // The state for deferred load quest.
+  int deferred_request_id_;
+  GURL deferred_url_;
+
+  DISALLOW_COPY_AND_ASSIGN(OfflineResourceHandler);
+};
+
+#endif  // CHROME_BROWSER_RENDERER_HOST_OFFLINE_RESOURCE_HANDLER_H_