text: // Copyright (c) 2012 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 CONTENT_BROWSER_LOADER_CROSS_SITE_RESOURCE_HANDLER_H_
  #define CONTENT_BROWSER_LOADER_CROSS_SITE_RESOURCE_HANDLER_H_
  
  #include "content/browser/loader/layered_resource_handler.h"
  #include "net/url_request/url_request_status.h"
  
  namespace net {
  class URLRequest;
  }
  
  namespace content {
  
  // Ensures that cross-site responses are delayed until the onunload handler of
  // the previous page is allowed to run.  This handler wraps an
  // AsyncEventHandler, and it sits inside SafeBrowsing and Buffered event
  // handlers.  This is important, so that it can intercept OnResponseStarted
  // after we determine that a response is safe and not a download.
  class CrossSiteResourceHandler : public LayeredResourceHandler {
   public:
    CrossSiteResourceHandler(scoped_ptr<ResourceHandler> next_handler,
                             net::URLRequest* request);
    virtual ~CrossSiteResourceHandler();
  
    // ResourceHandler implementation:
    virtual bool OnRequestRedirected(int request_id,
                                     const GURL& new_url,
                                     ResourceResponse* response,
                                     bool* defer) OVERRIDE;
    virtual bool OnResponseStarted(int request_id,
                                   ResourceResponse* response,
                                   bool* defer) OVERRIDE;
    virtual bool OnReadCompleted(int request_id,
                                 int bytes_read,
                                 bool* defer) OVERRIDE;
    virtual bool OnResponseCompleted(int request_id,
                                     const net::URLRequestStatus& status,
                                     const std::string& security_info) OVERRIDE;
  
    // We can now send the response to the new renderer, which will cause
    // WebContentsImpl to swap in the new renderer and destroy the old one.
    void ResumeResponse();
  
   private:
    // Prepare to render the cross-site response in a new RenderViewHost, by
    // telling the old RenderViewHost to run its onunload handler.
    void StartCrossSiteTransition(int request_id,
                                  ResourceResponse* response,
                                  bool should_transfer);
  
    void ResumeIfDeferred();
  
    bool has_started_response_;
    bool in_cross_site_transition_;
    bool completed_during_transition_;
    bool did_defer_;
    net::URLRequestStatus completed_status_;
    std::string completed_security_info_;
    ResourceResponse* response_;
  
    DISALLOW_COPY_AND_ASSIGN(CrossSiteResourceHandler);
  };
  
  }  // namespace content
  
  #endif  // CONTENT_BROWSER_LOADER_CROSS_SITE_RESOURCE_HANDLER_H_
  