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/files/file_path.h"
  14 #include "base/files/file_util.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
  27 using content::BrowserThread;
  28
  29 namespace component_updater {
  30
  31 namespace {
  32
  33 // CRX hash. The extension id is: npdjjkjlcidkjlamlmmdelcjbcpdjocm.
  34 const 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.
  40 const 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
  47 const char kRecoveryManifestName[] = "ChromeRecovery";
  48
  49 }  // namespace
  50
  51 class 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
  71 void 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
  89 void RecoveryUpdateVersionHelper(const Version& version, PrefService* prefs) {
  90   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  91   prefs->SetString(prefs::kRecoveryComponentVersion, version.GetString());
  92 }
  93
  94 RecoveryComponentInstaller::RecoveryComponentInstaller(const Version& version,
  95                                                        PrefService* prefs)
  96     : current_version_(version), prefs_(prefs) {
  97   DCHECK(version.IsValid());
  98 }
  99
 100 void RecoveryComponentInstaller::OnUpdateError(int error) {
 101   NOTREACHED() << "Recovery component update error: " << error;
 102 }
 103
 104 bool 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
 153 bool RecoveryComponentInstaller::GetInstalledFile(
 154     const std::string& file,
 155     base::FilePath* installed_file) {
 156   return false;
 157 }
 158
 159 void 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
 172 void RegisterPrefsForRecoveryComponent(PrefRegistrySimple* registry) {
 173   registry->RegisterStringPref(prefs::kRecoveryComponentVersion, "0.0.0.0");
 174 }
 175
 176 }  // namespace component_updater