src/chrome/browser/renderer_host/offline_resource_throttle.cc

   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 #include "chrome/browser/renderer_host/offline_resource_throttle.h"
   6
   7 #include <vector>
   8
   9 #include "base/bind.h"
  10 #include "base/logging.h"
  11 #include "base/memory/singleton.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/strings/string_util.h"
  14 #include "chrome/browser/chromeos/offline/offline_load_page.h"
  15 #include "chrome/browser/net/chrome_url_request_context.h"
  16 #include "chrome/common/url_constants.h"
  17 #include "content/public/browser/browser_thread.h"
  18 #include "content/public/browser/render_view_host.h"
  19 #include "content/public/browser/resource_controller.h"
  20 #include "content/public/browser/resource_request_info.h"
  21 #include "content/public/browser/web_contents.h"
  22 #include "net/base/net_errors.h"
  23 #include "net/base/net_util.h"
  24 #include "net/base/network_change_notifier.h"
  25 #include "net/url_request/url_request.h"
  26 #include "net/url_request/url_request_context.h"
  27 #include "webkit/browser/appcache/appcache_service.h"
  28
  29 using content::BrowserThread;
  30 using content::RenderViewHost;
  31 using content::WebContents;
  32
  33 namespace {
  34
  35 void ShowOfflinePage(
  36     int render_process_id,
  37     int render_view_id,
  38     const GURL& url,
  39     const chromeos::OfflineLoadPage::CompletionCallback& callback) {
  40   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  41
  42   // Check again on UI thread and proceed if it's connected.
  43   if (!net::NetworkChangeNotifier::IsOffline()) {
  44     BrowserThread::PostTask(
  45         BrowserThread::IO, FROM_HERE, base::Bind(callback, true));
  46   } else {
  47     RenderViewHost* render_view_host =
  48         RenderViewHost::FromID(render_process_id, render_view_id);
  49     WebContents* web_contents = render_view_host ?
  50         WebContents::FromRenderViewHost(render_view_host) : NULL;
  51     // There is a chance that the tab closed after we decided to show
  52     // the offline page on the IO thread and before we actually show the
  53     // offline page here on the UI thread.
  54     if (web_contents)
  55       (new chromeos::OfflineLoadPage(web_contents, url, callback))->Show();
  56   }
  57 }
  58
  59 }  // namespace
  60
  61 OfflineResourceThrottle::OfflineResourceThrottle(
  62     net::URLRequest* request,
  63     appcache::AppCacheService* appcache_service)
  64     : request_(request),
  65       appcache_service_(appcache_service) {
  66   DCHECK(appcache_service);
  67 }
  68
  69 OfflineResourceThrottle::~OfflineResourceThrottle() {
  70   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  71
  72   if (!appcache_completion_callback_.IsCancelled())
  73     appcache_completion_callback_.Cancel();
  74 }
  75
  76 void OfflineResourceThrottle::WillStartRequest(bool* defer) {
  77   if (!ShouldShowOfflinePage(request_->url()))
  78     return;
  79
  80   DVLOG(1) << "WillStartRequest: this=" << this << ", url=" << request_->url();
  81
  82   const GURL* url = &(request_->url());
  83   const GURL* first_party = &(request_->first_party_for_cookies());
  84
  85   // Anticipate a client-side HSTS based redirect from HTTP to HTTPS, and
  86   // ask the appcache about the HTTPS url instead of the HTTP url.
  87   GURL redirect_url;
  88   if (request_->GetHSTSRedirect(&redirect_url)) {
  89     if (url->GetOrigin() == first_party->GetOrigin())
  90       first_party = &redirect_url;
  91     url = &redirect_url;
  92   }
  93
  94   DCHECK(appcache_completion_callback_.IsCancelled());
  95
  96   appcache_completion_callback_.Reset(
  97       base::Bind(&OfflineResourceThrottle::OnCanHandleOfflineComplete,
  98                  AsWeakPtr()));
  99   appcache_service_->CanHandleMainResourceOffline(
 100       *url, *first_party,
 101       appcache_completion_callback_.callback());
 102
 103   *defer = true;
 104 }
 105
 106 void OfflineResourceThrottle::OnBlockingPageComplete(bool proceed) {
 107   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 108
 109   if (proceed) {
 110     controller()->Resume();
 111   } else {
 112     controller()->Cancel();
 113   }
 114 }
 115
 116 bool OfflineResourceThrottle::IsRemote(const GURL& url) const {
 117   return !net::IsLocalhost(url.host()) && (url.SchemeIs(chrome::kFtpScheme) ||
 118                                            url.SchemeIs(content::kHttpScheme) ||
 119                                            url.SchemeIs(content::kHttpsScheme));
 120 }
 121
 122 bool OfflineResourceThrottle::ShouldShowOfflinePage(const GURL& url) const {
 123   // If the network is disconnected while loading other resources, we'll simply
 124   // show broken link/images.
 125   return IsRemote(url) && net::NetworkChangeNotifier::IsOffline();
 126 }
 127
 128 void OfflineResourceThrottle::OnCanHandleOfflineComplete(int rv) {
 129   appcache_completion_callback_.Cancel();
 130
 131   if (rv == net::OK) {
 132     controller()->Resume();
 133   } else {
 134     const content::ResourceRequestInfo* info =
 135         content::ResourceRequestInfo::ForRequest(request_);
 136     BrowserThread::PostTask(
 137         BrowserThread::UI,
 138         FROM_HERE,
 139         base::Bind(
 140             &ShowOfflinePage,
 141             info->GetChildID(),
 142             info->GetRouteID(),
 143             request_->url(),
 144             base::Bind(
 145                 &OfflineResourceThrottle::OnBlockingPageComplete,
 146                 AsWeakPtr())));
 147   }
 148 }