recovery_component_installer.cc revision 03b57e008b61dfcb1fbad3aea950ae0e001748b0 
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/component_updater/recovery_component_installer.h"
6
7#include <string>
8
9#include "base/base_paths.h"
10#include "base/bind.h"
11#include "base/command_line.h"
12#include "base/compiler_specific.h"
13#include "base/file_util.h"
14#include "base/files/file_path.h"
15#include "base/logging.h"
16#include "base/path_service.h"
17#include "base/prefs/pref_registry_simple.h"
18#include "base/prefs/pref_service.h"
19#include "base/process/launch.h"
20#include "base/strings/string_util.h"
21#include "base/values.h"
22#include "components/component_updater/component_updater_paths.h"
23#include "components/component_updater/component_updater_service.h"
24#include "components/component_updater/pref_names.h"
25#include "content/public/browser/browser_thread.h"
26
27using content::BrowserThread;
28
29namespace component_updater {
30
31namespace {
32
33// CRX hash. The extension id is: npdjjkjlcidkjlamlmmdelcjbcpdjocm.
34const uint8 kSha2Hash[] = {0xdf, 0x39, 0x9a, 0x9b, 0x28, 0x3a, 0x9b, 0x0c,
35                           0xbc, 0xc3, 0x4b, 0x29, 0x12, 0xf3, 0x9e, 0x2c,
36                           0x19, 0x7a, 0x71, 0x4b, 0x0a, 0x7c, 0x80, 0x1c,
37                           0xf6, 0x29, 0x7c, 0x0a, 0x5f, 0xea, 0x67, 0xb7};
38
39// File name of the recovery binary on different platforms.
40const base::FilePath::CharType kRecoveryFileName[] =
41#if defined(OS_WIN)
42    FILE_PATH_LITERAL("ChromeRecovery.exe");
43#else  // OS_LINUX, OS_MACOSX, etc.
44    FILE_PATH_LITERAL("ChromeRecovery");
45#endif
46
47const char kRecoveryManifestName[] = "ChromeRecovery";
48
49}  // namespace
50
51class RecoveryComponentInstaller : public ComponentInstaller {
52 public:
53  explicit RecoveryComponentInstaller(const Version& version,
54                                      PrefService* prefs);
55
56  virtual ~RecoveryComponentInstaller() {}
57
58  virtual void OnUpdateError(int error) OVERRIDE;
59
60  virtual bool Install(const base::DictionaryValue& manifest,
61                       const base::FilePath& unpack_path) OVERRIDE;
62
63  virtual bool GetInstalledFile(const std::string& file,
64                                base::FilePath* installed_file) OVERRIDE;
65
66 private:
67  Version current_version_;
68  PrefService* prefs_;
69};
70
71void RecoveryRegisterHelper(ComponentUpdateService* cus, PrefService* prefs) {
72  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
73  Version version(prefs->GetString(prefs::kRecoveryComponentVersion));
74  if (!version.IsValid()) {
75    NOTREACHED();
76    return;
77  }
78
79  CrxComponent recovery;
80  recovery.name = "recovery";
81  recovery.installer = new RecoveryComponentInstaller(version, prefs);
82  recovery.version = version;
83  recovery.pk_hash.assign(kSha2Hash, &kSha2Hash[sizeof(kSha2Hash)]);
84  if (cus->RegisterComponent(recovery) != ComponentUpdateService::kOk) {
85    NOTREACHED() << "Recovery component registration failed.";
86  }
87}
88
89void RecoveryUpdateVersionHelper(const Version& version, PrefService* prefs) {
90  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
91  prefs->SetString(prefs::kRecoveryComponentVersion, version.GetString());
92}
93
94RecoveryComponentInstaller::RecoveryComponentInstaller(const Version& version,
95                                                       PrefService* prefs)
96    : current_version_(version), prefs_(prefs) {
97  DCHECK(version.IsValid());
98}
99
100void RecoveryComponentInstaller::OnUpdateError(int error) {
101  NOTREACHED() << "Recovery component update error: " << error;
102}
103
104bool RecoveryComponentInstaller::Install(const base::DictionaryValue& manifest,
105                                         const base::FilePath& unpack_path) {
106  std::string name;
107  manifest.GetStringASCII("name", &name);
108  if (name != kRecoveryManifestName)
109    return false;
110  std::string proposed_version;
111  manifest.GetStringASCII("version", &proposed_version);
112  Version version(proposed_version.c_str());
113  if (!version.IsValid())
114    return false;
115  if (current_version_.CompareTo(version) >= 0)
116    return false;
117
118  // Passed the basic tests. Copy the installation to a permanent directory.
119  base::FilePath path;
120  if (!PathService::Get(DIR_RECOVERY_BASE, &path))
121    return false;
122  path = path.AppendASCII(version.GetString());
123  if (base::PathExists(path) && !base::DeleteFile(path, true))
124    return false;
125  if (!base::Move(unpack_path, path)) {
126    DVLOG(1) << "Recovery component move failed.";
127    return false;
128  }
129
130  base::FilePath main_file = path.Append(kRecoveryFileName);
131  if (!base::PathExists(main_file))
132    return false;
133  // Run the recovery component.
134  CommandLine cmdline(main_file);
135  std::string arguments;
136  if (manifest.GetStringASCII("x-recovery-args", &arguments))
137    cmdline.AppendArg(arguments);
138  std::string add_version;
139  if (manifest.GetStringASCII("x-recovery-add-version", &add_version)) {
140    if (add_version == "yes")
141      cmdline.AppendSwitchASCII("version", current_version_.GetString());
142  }
143  current_version_ = version;
144  if (prefs_) {
145    BrowserThread::PostTask(
146        BrowserThread::UI,
147        FROM_HERE,
148        base::Bind(&RecoveryUpdateVersionHelper, version, prefs_));
149  }
150  return base::LaunchProcess(cmdline, base::LaunchOptions(), NULL);
151}
152
153bool RecoveryComponentInstaller::GetInstalledFile(
154    const std::string& file,
155    base::FilePath* installed_file) {
156  return false;
157}
158
159void RegisterRecoveryComponent(ComponentUpdateService* cus,
160                               PrefService* prefs) {
161#if !defined(OS_CHROMEOS)
162  // We delay execute the registration because we are not required in
163  // the critical path during browser startup.
164  BrowserThread::PostDelayedTask(
165      BrowserThread::UI,
166      FROM_HERE,
167      base::Bind(&RecoveryRegisterHelper, cus, prefs),
168      base::TimeDelta::FromSeconds(6));
169#endif
170}
171
172void RegisterPrefsForRecoveryComponent(PrefRegistrySimple* registry) {
173  registry->RegisterStringPref(prefs::kRecoveryComponentVersion, "0.0.0.0");
174}
175
176}  // namespace component_updater
177