recovery_component_installer.cc revision 5821806d5e7f356e8fa4b058a389a808ea183019 
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_path.h"
12#include "base/file_util.h"
13#include "base/logging.h"
14#include "base/path_service.h"
15#include "base/process_util.h"
16#include "base/string_util.h"
17#include "base/values.h"
18#include "chrome/browser/component_updater/component_updater_service.h"
19#include "chrome/browser/prefs/pref_service.h"
20#include "chrome/common/chrome_version_info.h"
21#include "chrome/common/pref_names.h"
22#include "content/public/browser/browser_thread.h"
23
24using content::BrowserThread;
25
26namespace {
27
28// CRX hash. The extension id is: npdjjkjlcidkjlamlmmdelcjbcpdjocm.
29const uint8 sha2_hash[] = {0xdf, 0x39, 0x9a, 0x9b, 0x28, 0x3a, 0x9b, 0x0c,
30                           0xbc, 0xc3, 0x4b, 0x29, 0x12, 0xf3, 0x9e, 0x2c,
31                           0x19, 0x7a, 0x71, 0x4b, 0x0a, 0x7c, 0x80, 0x1c,
32                           0xf6, 0x29, 0x7c, 0x0a, 0x5f, 0xea, 0x67, 0xb7};
33
34// File name of the recovery binary on different platforms.
35const FilePath::CharType kRecoveryFileName[] =
36#if defined(OS_WIN)
37    FILE_PATH_LITERAL("ChromeRecovery.exe");
38#else  // OS_LINUX, OS_MACOSX, etc.
39    FILE_PATH_LITERAL("ChromeRecovery");
40#endif
41
42const char kRecoveryManifestName[] = "ChromeRecovery";
43
44}  // namespace
45
46class RecoveryComponentInstaller : public ComponentInstaller {
47 public:
48  explicit RecoveryComponentInstaller(const Version& version,
49                                      PrefService* prefs);
50
51  virtual ~RecoveryComponentInstaller() {}
52
53  virtual void OnUpdateError(int error) OVERRIDE;
54
55  virtual bool Install(base::DictionaryValue* manifest,
56                       const FilePath& unpack_path) OVERRIDE;
57
58 private:
59  Version current_version_;
60  PrefService* prefs_;
61};
62
63void RecoveryRegisterHelper(ComponentUpdateService* cus, PrefService* prefs) {
64  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
65  prefs->RegisterStringPref(prefs::kRecoveryComponentVersion, "0.0.0.0");
66  Version version(prefs->GetString(prefs::kRecoveryComponentVersion));
67  if (!version.IsValid()) {
68    NOTREACHED();
69    return;
70  }
71
72  CrxComponent recovery;
73  recovery.name = "recovery";
74  recovery.installer = new RecoveryComponentInstaller(version, prefs);
75  recovery.version = version;
76  recovery.pk_hash.assign(sha2_hash, &sha2_hash[sizeof(sha2_hash)]);
77  if (cus->RegisterComponent(recovery) != ComponentUpdateService::kOk) {
78    NOTREACHED() << "Recovery component registration failed.";
79  }
80}
81
82void RecoveryUpdateVersionHelper(const Version& version, PrefService* prefs) {
83  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
84  prefs->SetString(prefs::kRecoveryComponentVersion, version.GetString());
85}
86
87RecoveryComponentInstaller::RecoveryComponentInstaller(
88      const Version& version, PrefService* prefs)
89    : current_version_(version), prefs_(prefs){
90  DCHECK(version.IsValid());
91}
92
93void RecoveryComponentInstaller::OnUpdateError(int error) {
94  NOTREACHED() << "Recovery component update error: " << error;
95}
96
97bool RecoveryComponentInstaller::Install(base::DictionaryValue* manifest,
98                                         const FilePath& unpack_path) {
99  std::string name;
100  manifest->GetStringASCII("name", &name);
101  if (name != kRecoveryManifestName)
102    return false;
103  std::string proposed_version;
104  manifest->GetStringASCII("version", &proposed_version);
105  Version version(proposed_version.c_str());
106  if (!version.IsValid())
107    return false;
108  if (current_version_.CompareTo(version) >= 0)
109    return false;
110  FilePath main_file = unpack_path.Append(kRecoveryFileName);
111  if (!file_util::PathExists(main_file))
112    return false;
113  // Passed the basic tests. The installation continues with the
114  // recovery component itself running from the temp directory.
115  CommandLine cmdline(main_file);
116  std::string arguments;
117  if (manifest->GetStringASCII("x-recovery-args", &arguments))
118    cmdline.AppendArg(arguments);
119  std::string add_version;
120  if (manifest->GetStringASCII("x-recovery-add-version", &add_version)) {
121    if (add_version == "yes")
122      cmdline.AppendSwitchASCII("version", current_version_.GetString());
123  }
124  current_version_ = version;
125  if (prefs_) {
126    BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
127        base::Bind(&RecoveryUpdateVersionHelper, version, prefs_));
128  }
129  return base::LaunchProcess(cmdline, base::LaunchOptions(), NULL);
130}
131
132void RegisterRecoveryComponent(ComponentUpdateService* cus,
133                               PrefService* prefs) {
134#if !defined(OS_CHROMEOS)
135  // We delay execute the registration because we are not required in
136  // the critical path during browser startup.
137  BrowserThread::PostDelayedTask(
138      BrowserThread::UI,
139      FROM_HERE,
140      base::Bind(&RecoveryRegisterHelper, cus, prefs),
141      base::TimeDelta::FromSeconds(6));
142#endif
143}
144