src/chrome/browser/chromeos/login/screens/terms_of_service_screen.cc

   1 // Copyright (c) 2013 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/chromeos/login/screens/terms_of_service_screen.h"
   6
   7 #include <string>
   8
   9 #include "base/location.h"
  10 #include "base/logging.h"
  11 #include "base/prefs/pref_service.h"
  12 #include "base/time/time.h"
  13 #include "chrome/browser/browser_process.h"
  14 #include "chrome/browser/chromeos/login/screens/screen_observer.h"
  15 #include "chrome/browser/chromeos/login/wizard_controller.h"
  16 #include "chrome/browser/policy/browser_policy_connector.h"
  17 #include "chrome/browser/profiles/profile.h"
  18 #include "chrome/browser/profiles/profile_manager.h"
  19 #include "chrome/common/pref_names.h"
  20 #include "net/http/http_response_headers.h"
  21 #include "net/url_request/url_fetcher.h"
  22 #include "net/url_request/url_request_context_getter.h"
  23 #include "net/url_request/url_request_status.h"
  24 #include "url/gurl.h"
  25
  26 namespace chromeos {
  27
  28 TermsOfServiceScreen::TermsOfServiceScreen(ScreenObserver* screen_observer,
  29                                            TermsOfServiceScreenActor* actor)
  30     : WizardScreen(screen_observer),
  31       actor_(actor) {
  32   DCHECK(actor_);
  33   if (actor_)
  34     actor_->SetDelegate(this);
  35 }
  36
  37 TermsOfServiceScreen::~TermsOfServiceScreen() {
  38   if (actor_)
  39     actor_->SetDelegate(NULL);
  40 }
  41
  42 void TermsOfServiceScreen::PrepareToShow() {
  43 }
  44
  45 void TermsOfServiceScreen::Show() {
  46   if (!actor_)
  47     return;
  48
  49   // Set the domain name whose Terms of Service are being shown.
  50   actor_->SetDomain(
  51       g_browser_process->browser_policy_connector()->GetEnterpriseDomain());
  52
  53   // Show the screen.
  54   actor_->Show();
  55
  56   // Start downloading the Terms of Service.
  57   StartDownload();
  58 }
  59
  60 void TermsOfServiceScreen::Hide() {
  61   if (actor_)
  62     actor_->Hide();
  63 }
  64
  65 std::string TermsOfServiceScreen::GetName() const {
  66   return WizardController::kTermsOfServiceScreenName;
  67 }
  68
  69 void TermsOfServiceScreen::OnDecline() {
  70   get_screen_observer()->OnExit(ScreenObserver::TERMS_OF_SERVICE_DECLINED);
  71 }
  72
  73 void TermsOfServiceScreen::OnAccept() {
  74   get_screen_observer()->OnExit(ScreenObserver::TERMS_OF_SERVICE_ACCEPTED);
  75 }
  76
  77 void TermsOfServiceScreen::OnActorDestroyed(TermsOfServiceScreenActor* actor) {
  78   if (actor_ == actor)
  79     actor_ = NULL;
  80 }
  81
  82 void TermsOfServiceScreen::StartDownload() {
  83   const PrefService* prefs = ProfileManager::GetDefaultProfile()->GetPrefs();
  84   // If an URL from which the Terms of Service can be downloaded has not been
  85   // set, show an error message to the user.
  86   std::string terms_of_service_url =
  87       prefs->GetString(prefs::kTermsOfServiceURL);
  88   if (terms_of_service_url.empty()) {
  89     if (actor_)
  90       actor_->OnLoadError();
  91     return;
  92   }
  93
  94   // Start downloading the Terms of Service.
  95   terms_of_service_fetcher_.reset(net::URLFetcher::Create(
  96       GURL(terms_of_service_url), net::URLFetcher::GET, this));
  97   terms_of_service_fetcher_->SetRequestContext(
  98       g_browser_process->system_request_context());
  99   // Request a text/plain MIME type as only plain-text Terms of Service are
 100   // accepted.
 101   terms_of_service_fetcher_->AddExtraRequestHeader("Accept: text/plain");
 102   // Retry up to three times if network changes are detected during the
 103   // download.
 104   terms_of_service_fetcher_->SetAutomaticallyRetryOnNetworkChanges(3);
 105   terms_of_service_fetcher_->Start();
 106
 107   // Abort the download attempt if it takes longer than one minute.
 108   download_timer_.Start(FROM_HERE, base::TimeDelta::FromMinutes(1),
 109                         this, &TermsOfServiceScreen::OnDownloadTimeout);
 110 }
 111
 112 void TermsOfServiceScreen::OnDownloadTimeout() {
 113   // Abort the download attempt.
 114   terms_of_service_fetcher_.reset();
 115
 116   // Show an error message to the user.
 117   if (actor_)
 118     actor_->OnLoadError();
 119 }
 120
 121 void TermsOfServiceScreen::OnURLFetchComplete(const net::URLFetcher* source) {
 122   if (source != terms_of_service_fetcher_.get()) {
 123     NOTREACHED() << "Callback from foreign URL fetcher";
 124     return;
 125   }
 126
 127   download_timer_.Stop();
 128
 129   // Destroy the fetcher when this method returns.
 130   scoped_ptr<net::URLFetcher> fetcher(terms_of_service_fetcher_.Pass());
 131   if (!actor_)
 132     return;
 133
 134   std::string terms_of_service;
 135   std::string mime_type;
 136   // If the Terms of Service could not be downloaded, do not have a MIME type of
 137   // text/plain or are empty, show an error message to the user.
 138   if (!source->GetStatus().is_success() ||
 139       !source->GetResponseHeaders()->GetMimeType(&mime_type) ||
 140       mime_type != "text/plain" ||
 141       !source->GetResponseAsString(&terms_of_service)) {
 142     actor_->OnLoadError();
 143   } else {
 144     // If the Terms of Service were downloaded successfully, show them to the
 145     // user.
 146     actor_->OnLoadSuccess(terms_of_service);
 147   }
 148 }
 149
 150 }  // namespace chromeos