src/chrome/browser/component_updater/recovery_component_installer.cc

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