recovery_component_installer.cc revision bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3 
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 {
28
29// CRX hash. The extension id is: npdjjkjlcidkjlamlmmdelcjbcpdjocm.
30const uint8 kSha2Hash[] = {0xdf, 0x39, 0x9a, 0x9b, 0x28, 0x3a, 0x9b, 0x0c,
31                           0xbc, 0xc3, 0x4b, 0x29, 0x12, 0xf3, 0x9e, 0x2c,
32                           0x19, 0x7a, 0x71, 0x4b, 0x0a, 0x7c, 0x80, 0x1c,
33                           0xf6, 0x29, 0x7c, 0x0a, 0x5f, 0xea, 0x67, 0xb7};
34
35// File name of the recovery binary on different platforms.
36const base::FilePath::CharType kRecoveryFileName[] =
37#if defined(OS_WIN)
38    FILE_PATH_LITERAL("ChromeRecovery.exe");
39#else  // OS_LINUX, OS_MACOSX, etc.
40    FILE_PATH_LITERAL("ChromeRecovery");
41#endif
42
43const char kRecoveryManifestName[] = "ChromeRecovery";
44
45}  // namespace
46
47class RecoveryComponentInstaller : public ComponentInstaller {
48 public:
49  explicit RecoveryComponentInstaller(const Version& version,
50                                      PrefService* prefs);
51
52  virtual ~RecoveryComponentInstaller() {}
53
54  virtual void OnUpdateError(int error) OVERRIDE;
55
56  virtual bool Install(const base::DictionaryValue& manifest,
57                       const base::FilePath& unpack_path) OVERRIDE;
58
59  virtual bool GetInstalledFile(const std::string& file,
60                                base::FilePath* installed_file) OVERRIDE;
61
62 private:
63  Version current_version_;
64  PrefService* prefs_;
65};
66
67void RecoveryRegisterHelper(ComponentUpdateService* cus,
68                            PrefService* prefs) {
69  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
70  Version version(prefs->GetString(prefs::kRecoveryComponentVersion));
71  if (!version.IsValid()) {
72    NOTREACHED();
73    return;
74  }
75
76  CrxComponent recovery;
77  recovery.name = "recovery";
78  recovery.installer = new RecoveryComponentInstaller(version, prefs);
79  recovery.version = version;
80  recovery.pk_hash.assign(kSha2Hash, &kSha2Hash[sizeof(kSha2Hash)]);
81  if (cus->RegisterComponent(recovery) != ComponentUpdateService::kOk) {
82    NOTREACHED() << "Recovery component registration failed.";
83  }
84}
85
86void RecoveryUpdateVersionHelper(const Version& version, PrefService* prefs) {
87  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
88  prefs->SetString(prefs::kRecoveryComponentVersion, version.GetString());
89}
90
91RecoveryComponentInstaller::RecoveryComponentInstaller(
92      const Version& version, PrefService* prefs)
93    : current_version_(version), prefs_(prefs){
94  DCHECK(version.IsValid());
95}
96
97void RecoveryComponentInstaller::OnUpdateError(int error) {
98  NOTREACHED() << "Recovery component update error: " << error;
99}
100
101bool RecoveryComponentInstaller::Install(const base::DictionaryValue& manifest,
102                                         const base::FilePath& unpack_path) {
103  std::string name;
104  manifest.GetStringASCII("name", &name);
105  if (name != kRecoveryManifestName)
106    return false;
107  std::string proposed_version;
108  manifest.GetStringASCII("version", &proposed_version);
109  Version version(proposed_version.c_str());
110  if (!version.IsValid())
111    return false;
112  if (current_version_.CompareTo(version) >= 0)
113    return false;
114  base::FilePath main_file = unpack_path.Append(kRecoveryFileName);
115  if (!base::PathExists(main_file))
116    return false;
117  // Passed the basic tests. The installation continues with the
118  // recovery component itself running from the temp directory.
119  CommandLine cmdline(main_file);
120  std::string arguments;
121  if (manifest.GetStringASCII("x-recovery-args", &arguments))
122    cmdline.AppendArg(arguments);
123  std::string add_version;
124  if (manifest.GetStringASCII("x-recovery-add-version", &add_version)) {
125    if (add_version == "yes")
126      cmdline.AppendSwitchASCII("version", current_version_.GetString());
127  }
128  current_version_ = version;
129  if (prefs_) {
130    BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
131        base::Bind(&RecoveryUpdateVersionHelper, version, prefs_));
132  }
133  return base::LaunchProcess(cmdline, base::LaunchOptions(), NULL);
134}
135
136bool RecoveryComponentInstaller::GetInstalledFile(
137    const std::string& file, base::FilePath* installed_file) {
138  return false;
139}
140
141void RegisterRecoveryComponent(ComponentUpdateService* cus,
142                               PrefService* prefs) {
143#if !defined(OS_CHROMEOS)
144  // We delay execute the registration because we are not required in
145  // the critical path during browser startup.
146  BrowserThread::PostDelayedTask(
147      BrowserThread::UI,
148      FROM_HERE,
149      base::Bind(&RecoveryRegisterHelper, cus, prefs),
150      base::TimeDelta::FromSeconds(6));
151#endif
152}
153
154void RegisterPrefsForRecoveryComponent(PrefRegistrySimple* registry) {
155  registry->RegisterStringPref(prefs::kRecoveryComponentVersion, "0.0.0.0");
156}
157