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
26 namespace chromeos {
27
TermsOfServiceScreen(ScreenObserver * screen_observer,TermsOfServiceScreenActor * actor)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
~TermsOfServiceScreen()37 TermsOfServiceScreen::~TermsOfServiceScreen() {
38 if (actor_)
39 actor_->SetDelegate(NULL);
40 }
41
PrepareToShow()42 void TermsOfServiceScreen::PrepareToShow() {
43 }
44
Show()45 void 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
Hide()61 void TermsOfServiceScreen::Hide() {
62 if (actor_)
63 actor_->Hide();
64 }
65
GetName() const66 std::string TermsOfServiceScreen::GetName() const {
67 return WizardController::kTermsOfServiceScreenName;
68 }
69
OnDecline()70 void TermsOfServiceScreen::OnDecline() {
71 get_screen_observer()->OnExit(ScreenObserver::TERMS_OF_SERVICE_DECLINED);
72 }
73
OnAccept()74 void TermsOfServiceScreen::OnAccept() {
75 get_screen_observer()->OnExit(ScreenObserver::TERMS_OF_SERVICE_ACCEPTED);
76 }
77
OnActorDestroyed(TermsOfServiceScreenActor * actor)78 void TermsOfServiceScreen::OnActorDestroyed(TermsOfServiceScreenActor* actor) {
79 if (actor_ == actor)
80 actor_ = NULL;
81 }
82
StartDownload()83 void 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
OnDownloadTimeout()113 void 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
OnURLFetchComplete(const net::URLFetcher * source)122 void 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