recovery_component_installer.cc revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
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 "base/base_paths.h"
8#include "base/bind.h"
9#include "base/command_line.h"
10#include "base/compiler_specific.h"
11#include "base/file_util.h"
12#include "base/files/file_path.h"
13#include "base/logging.h"
14#include "base/path_service.h"
15#include "base/prefs/pref_registry_simple.h"
16#include "base/prefs/pref_service.h"
17#include "base/process/launch.h"
18#include "base/strings/string_util.h"
19#include "base/values.h"
20#include "chrome/browser/component_updater/component_updater_service.h"
21#include "chrome/common/chrome_version_info.h"
22#include "chrome/common/pref_names.h"
23#include "content/public/browser/browser_thread.h"
24
25using content::BrowserThread;
26
27namespace component_updater {
28
29namespace {
30
31// CRX hash. The extension id is: npdjjkjlcidkjlamlmmdelcjbcpdjocm.
32const uint8 kSha2Hash[] = {0xdf, 0x39, 0x9a, 0x9b, 0x28, 0x3a, 0x9b, 0x0c,
33                           0xbc, 0xc3, 0x4b, 0x29, 0x12, 0xf3, 0x9e, 0x2c,
34                           0x19, 0x7a, 0x71, 0x4b, 0x0a, 0x7c, 0x80, 0x1c,
35                           0xf6, 0x29, 0x7c, 0x0a, 0x5f, 0xea, 0x67, 0xb7};
36
37// File name of the recovery binary on different platforms.
38const base::FilePath::CharType kRecoveryFileName[] =
39#if defined(OS_WIN)
40    FILE_PATH_LITERAL("ChromeRecovery.exe");
41#else  // OS_LINUX, OS_MACOSX, etc.
42    FILE_PATH_LITERAL("ChromeRecovery");
43#endif
44
45const char kRecoveryManifestName[] = "ChromeRecovery";
46
47}  // namespace
48
49class RecoveryComponentInstaller : public ComponentInstaller {
50 public:
51  explicit RecoveryComponentInstaller(const Version& version,
52                                      PrefService* prefs);
53
54  virtual ~RecoveryComponentInstaller() {}
55
56  virtual void OnUpdateError(int error) OVERRIDE;
57
58  virtual bool Install(const base::DictionaryValue& manifest,
59                       const base::FilePath& unpack_path) OVERRIDE;
60
61  virtual bool GetInstalledFile(const std::string& file,
62                                base::FilePath* installed_file) OVERRIDE;
63
64 private:
65  Version current_version_;
66  PrefService* prefs_;
67};
68
69void RecoveryRegisterHelper(ComponentUpdateService* cus,
70                            PrefService* prefs) {
71  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
72  Version version(prefs->GetString(prefs::kRecoveryComponentVersion));
73  if (!version.IsValid()) {
74    NOTREACHED();
75    return;
76  }
77
78  CrxComponent recovery;
79  recovery.name = "recovery";
80  recovery.installer = new RecoveryComponentInstaller(version, prefs);
81  recovery.version = version;
82  recovery.pk_hash.assign(kSha2Hash, &kSha2Hash[sizeof(kSha2Hash)]);
83  if (cus->RegisterComponent(recovery) != ComponentUpdateService::kOk) {
84    NOTREACHED() << "Recovery component registration failed.";
85  }
86}
87
88void RecoveryUpdateVersionHelper(const Version& version, PrefService* prefs) {
89  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
90  prefs->SetString(prefs::kRecoveryComponentVersion, version.GetString());
91}
92
93RecoveryComponentInstaller::RecoveryComponentInstaller(
94      const Version& version, PrefService* prefs)
95    : current_version_(version), prefs_(prefs){
96  DCHECK(version.IsValid());
97}
98
99void RecoveryComponentInstaller::OnUpdateError(int error) {
100  NOTREACHED() << "Recovery component update error: " << error;
101}
102
103bool RecoveryComponentInstaller::Install(const base::DictionaryValue& manifest,
104                                         const base::FilePath& unpack_path) {
105  std::string name;
106  manifest.GetStringASCII("name", &name);
107  if (name != kRecoveryManifestName)
108    return false;
109  std::string proposed_version;
110  manifest.GetStringASCII("version", &proposed_version);
111  Version version(proposed_version.c_str());
112  if (!version.IsValid())
113    return false;
114  if (current_version_.CompareTo(version) >= 0)
115    return false;
116  base::FilePath main_file = unpack_path.Append(kRecoveryFileName);
117  if (!base::PathExists(main_file))
118    return false;
119  // Passed the basic tests. The installation continues with the
120  // recovery component itself running from the temp directory.
121  CommandLine cmdline(main_file);
122  std::string arguments;
123  if (manifest.GetStringASCII("x-recovery-args", &arguments))
124    cmdline.AppendArg(arguments);
125  std::string add_version;
126  if (manifest.GetStringASCII("x-recovery-add-version", &add_version)) {
127    if (add_version == "yes")
128      cmdline.AppendSwitchASCII("version", current_version_.GetString());
129  }
130  current_version_ = version;
131  if (prefs_) {
132    BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
133        base::Bind(&RecoveryUpdateVersionHelper, version, prefs_));
134  }
135  return base::LaunchProcess(cmdline, base::LaunchOptions(), NULL);
136}
137
138bool RecoveryComponentInstaller::GetInstalledFile(
139    const std::string& file, base::FilePath* installed_file) {
140  return false;
141}
142
143void RegisterRecoveryComponent(ComponentUpdateService* cus,
144                               PrefService* prefs) {
145#if !defined(OS_CHROMEOS)
146  // We delay execute the registration because we are not required in
147  // the critical path during browser startup.
148  BrowserThread::PostDelayedTask(
149      BrowserThread::UI,
150      FROM_HERE,
151      base::Bind(&RecoveryRegisterHelper, cus, prefs),
152      base::TimeDelta::FromSeconds(6));
153#endif
154}
155
156void RegisterPrefsForRecoveryComponent(PrefRegistrySimple* registry) {
157  registry->RegisterStringPref(prefs::kRecoveryComponentVersion, "0.0.0.0");
158}
159
160}  // namespace component_updater
161
162