terms_of_service_screen.cc revision c2e0dbddbe15c98d52c4786dac06cb8952a8ae6d 
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.h"
13#include "chrome/browser/browser_process.h"
14#include "chrome/browser/chromeos/login/screens/screen_observer.h"
15#include "chrome/browser/chromeos/login/user.h"
16#include "chrome/browser/chromeos/login/user_manager.h"
17#include "chrome/browser/chromeos/login/wizard_controller.h"
18#include "chrome/browser/chromeos/profiles/profile_helper.h"
19#include "chrome/browser/profiles/profile.h"
20#include "chrome/common/pref_names.h"
21#include "google_apis/gaia/gaia_auth_util.h"
22#include "googleurl/src/gurl.h"
23#include "net/http/http_response_headers.h"
24#include "net/url_request/url_fetcher.h"
25#include "net/url_request/url_request_context_getter.h"
26#include "net/url_request/url_request_status.h"
27
28namespace chromeos {
29
30TermsOfServiceScreen::TermsOfServiceScreen(ScreenObserver* screen_observer,
31                                           TermsOfServiceScreenActor* actor)
32    : WizardScreen(screen_observer),
33      actor_(actor) {
34  DCHECK(actor_);
35  if (actor_)
36    actor_->SetDelegate(this);
37}
38
39TermsOfServiceScreen::~TermsOfServiceScreen() {
40  if (actor_)
41    actor_->SetDelegate(NULL);
42}
43
44void TermsOfServiceScreen::PrepareToShow() {
45}
46
47void TermsOfServiceScreen::Show() {
48  if (!actor_)
49    return;
50
51  // Set the domain name whose Terms of Service are being shown.
52  actor_->SetDomain(gaia::ExtractDomainName(
53      UserManager::Get()->GetLoggedInUser()->email()));
54
55  // Show the screen.
56  actor_->Show();
57
58  // Start downloading the Terms of Service.
59  StartDownload();
60}
61
62void TermsOfServiceScreen::Hide() {
63  if (actor_)
64    actor_->Hide();
65}
66
67std::string TermsOfServiceScreen::GetName() const {
68  return WizardController::kTermsOfServiceScreenName;
69}
70
71void TermsOfServiceScreen::OnDecline() {
72  get_screen_observer()->OnExit(ScreenObserver::TERMS_OF_SERVICE_DECLINED);
73}
74
75void TermsOfServiceScreen::OnAccept() {
76  get_screen_observer()->OnExit(ScreenObserver::TERMS_OF_SERVICE_ACCEPTED);
77}
78
79void TermsOfServiceScreen::OnActorDestroyed(TermsOfServiceScreenActor* actor) {
80  if (actor_ == actor)
81    actor_ = NULL;
82}
83
84void TermsOfServiceScreen::StartDownload() {
85  const PrefService* prefs = ProfileHelper::GetSigninProfile()->GetPrefs();
86  // If an URL from which the Terms of Service can be downloaded has not been
87  // set, show an error message to the user.
88  std::string terms_of_service_url =
89      prefs->GetString(prefs::kTermsOfServiceURL);
90  if (terms_of_service_url.empty()) {
91    if (actor_)
92      actor_->OnLoadError();
93    return;
94  }
95
96  // Start downloading the Terms of Service.
97  terms_of_service_fetcher_.reset(net::URLFetcher::Create(
98      GURL(terms_of_service_url), net::URLFetcher::GET, this));
99  terms_of_service_fetcher_->SetRequestContext(
100      g_browser_process->system_request_context());
101  // Request a text/plain MIME type as only plain-text Terms of Service are
102  // accepted.
103  terms_of_service_fetcher_->AddExtraRequestHeader("Accept: text/plain");
104  // Retry up to three times if network changes are detected during the
105  // download.
106  terms_of_service_fetcher_->SetAutomaticallyRetryOnNetworkChanges(3);
107  terms_of_service_fetcher_->Start();
108
109  // Abort the download attempt if it takes longer than one minute.
110  download_timer_.Start(FROM_HERE, base::TimeDelta::FromMinutes(1),
111                        this, &TermsOfServiceScreen::OnDownloadTimeout);
112}
113
114void TermsOfServiceScreen::OnDownloadTimeout() {
115  // Abort the download attempt.
116  terms_of_service_fetcher_.reset();
117
118  // Show an error message to the user.
119  if (actor_)
120    actor_->OnLoadError();
121}
122
123void TermsOfServiceScreen::OnURLFetchComplete(const net::URLFetcher* source) {
124  if (source != terms_of_service_fetcher_.get()) {
125    NOTREACHED() << "Callback from foreign URL fetcher";
126    return;
127  }
128
129  download_timer_.Stop();
130
131  // Destroy the fetcher when this method returns.
132  scoped_ptr<net::URLFetcher> fetcher(terms_of_service_fetcher_.Pass());
133  if (!actor_)
134    return;
135
136  std::string terms_of_service;
137  std::string mime_type;
138  // If the Terms of Service could not be downloaded, do not have a MIME type of
139  // text/plain or are empty, show an error message to the user.
140  if (!source->GetStatus().is_success() ||
141      !source->GetResponseHeaders()->GetMimeType(&mime_type) ||
142      mime_type != "text/plain" ||
143      !source->GetResponseAsString(&terms_of_service)) {
144    actor_->OnLoadError();
145  } else {
146    // If the Terms of Service were downloaded successfully, show them to the
147    // user.
148    actor_->OnLoadSuccess(terms_of_service);
149  }
150}
151
152}  // namespace chromeos
153