terms_of_service_screen.cc revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
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/chromeos/policy/browser_policy_connector_chromeos.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
26namespace chromeos {
27
28TermsOfServiceScreen::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
37TermsOfServiceScreen::~TermsOfServiceScreen() {
38  if (actor_)
39    actor_->SetDelegate(NULL);
40}
41
42void TermsOfServiceScreen::PrepareToShow() {
43}
44
45void TermsOfServiceScreen::Show() {
46  if (!actor_)
47    return;
48
49  // Set the domain name whose Terms of Service are being shown.
50  policy::BrowserPolicyConnectorChromeOS* connector =
51      g_browser_process->platform_part()->browser_policy_connector_chromeos();
52  actor_->SetDomain(connector->GetEnterpriseDomain());
53
54  // Show the screen.
55  actor_->Show();
56
57  // Start downloading the Terms of Service.
58  StartDownload();
59}
60
61void TermsOfServiceScreen::Hide() {
62  if (actor_)
63    actor_->Hide();
64}
65
66std::string TermsOfServiceScreen::GetName() const {
67  return WizardController::kTermsOfServiceScreenName;
68}
69
70void TermsOfServiceScreen::OnDecline() {
71  get_screen_observer()->OnExit(ScreenObserver::TERMS_OF_SERVICE_DECLINED);
72}
73
74void TermsOfServiceScreen::OnAccept() {
75  get_screen_observer()->OnExit(ScreenObserver::TERMS_OF_SERVICE_ACCEPTED);
76}
77
78void TermsOfServiceScreen::OnActorDestroyed(TermsOfServiceScreenActor* actor) {
79  if (actor_ == actor)
80    actor_ = NULL;
81}
82
83void TermsOfServiceScreen::StartDownload() {
84  const PrefService* prefs = ProfileManager::GetActiveUserProfile()->GetPrefs();
85  // If an URL from which the Terms of Service can be downloaded has not been
86  // set, show an error message to the user.
87  std::string terms_of_service_url =
88      prefs->GetString(prefs::kTermsOfServiceURL);
89  if (terms_of_service_url.empty()) {
90    if (actor_)
91      actor_->OnLoadError();
92    return;
93  }
94
95  // Start downloading the Terms of Service.
96  terms_of_service_fetcher_.reset(net::URLFetcher::Create(
97      GURL(terms_of_service_url), net::URLFetcher::GET, this));
98  terms_of_service_fetcher_->SetRequestContext(
99      g_browser_process->system_request_context());
100  // Request a text/plain MIME type as only plain-text Terms of Service are
101  // accepted.
102  terms_of_service_fetcher_->AddExtraRequestHeader("Accept: text/plain");
103  // Retry up to three times if network changes are detected during the
104  // download.
105  terms_of_service_fetcher_->SetAutomaticallyRetryOnNetworkChanges(3);
106  terms_of_service_fetcher_->Start();
107
108  // Abort the download attempt if it takes longer than one minute.
109  download_timer_.Start(FROM_HERE, base::TimeDelta::FromMinutes(1),
110                        this, &TermsOfServiceScreen::OnDownloadTimeout);
111}
112
113void TermsOfServiceScreen::OnDownloadTimeout() {
114  // Abort the download attempt.
115  terms_of_service_fetcher_.reset();
116
117  // Show an error message to the user.
118  if (actor_)
119    actor_->OnLoadError();
120}
121
122void TermsOfServiceScreen::OnURLFetchComplete(const net::URLFetcher* source) {
123  if (source != terms_of_service_fetcher_.get()) {
124    NOTREACHED() << "Callback from foreign URL fetcher";
125    return;
126  }
127
128  download_timer_.Stop();
129
130  // Destroy the fetcher when this method returns.
131  scoped_ptr<net::URLFetcher> fetcher(terms_of_service_fetcher_.Pass());
132  if (!actor_)
133    return;
134
135  std::string terms_of_service;
136  std::string mime_type;
137  // If the Terms of Service could not be downloaded, do not have a MIME type of
138  // text/plain or are empty, show an error message to the user.
139  if (!source->GetStatus().is_success() ||
140      !source->GetResponseHeaders()->GetMimeType(&mime_type) ||
141      mime_type != "text/plain" ||
142      !source->GetResponseAsString(&terms_of_service)) {
143    actor_->OnLoadError();
144  } else {
145    // If the Terms of Service were downloaded successfully, show them to the
146    // user.
147    actor_->OnLoadSuccess(terms_of_service);
148  }
149}
150
151}  // namespace chromeos
152