components/component_updater/default_component_installer.cc

   1 // Copyright 2014 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 "base/bind.h"
   6 #include "base/bind_helpers.h"
   7 #include "base/files/file_enumerator.h"
   8 #include "base/files/file_path.h"
   9 #include "base/files/file_util.h"
  10 #include "base/location.h"
  11 #include "base/message_loop/message_loop_proxy.h"
  12 #include "base/sequenced_task_runner.h"
  13 #include "base/single_thread_task_runner.h"
  14 #include "base/values.h"
  15 #include "base/version.h"
  16 // TODO(ddorwin): Find a better place for ReadManifest.
  17 #include "components/component_updater/component_unpacker.h"
  18 #include "components/component_updater/component_updater_configurator.h"
  19 #include "components/component_updater/default_component_installer.h"
  20
  21 namespace component_updater {
  22
  23 namespace {
  24 // Version "0" corresponds to no installed version. By the server's conventions,
  25 // we represent it as a dotted quad.
  26 const char kNullVersion[] = "0.0.0.0";
  27 }  // namespace
  28
  29 ComponentInstallerTraits::~ComponentInstallerTraits() {
  30 }
  31
  32 DefaultComponentInstaller::DefaultComponentInstaller(
  33     scoped_ptr<ComponentInstallerTraits> installer_traits)
  34     : current_version_(kNullVersion),
  35       main_task_runner_(base::MessageLoopProxy::current()) {
  36   installer_traits_ = installer_traits.Pass();
  37 }
  38
  39 DefaultComponentInstaller::~DefaultComponentInstaller() {
  40   DCHECK(thread_checker_.CalledOnValidThread());
  41 }
  42
  43 void DefaultComponentInstaller::Register(ComponentUpdateService* cus) {
  44   DCHECK(thread_checker_.CalledOnValidThread());
  45   task_runner_ = cus->GetSequencedTaskRunner();
  46
  47   if (!installer_traits_) {
  48     NOTREACHED() << "A DefaultComponentInstaller has been created but "
  49                  << "has no installer traits.";
  50     return;
  51   }
  52   task_runner_->PostTask(
  53       FROM_HERE,
  54       base::Bind(&DefaultComponentInstaller::StartRegistration,
  55                  base::Unretained(this),
  56                  cus));
  57 }
  58
  59 void DefaultComponentInstaller::OnUpdateError(int error) {
  60   NOTREACHED() << "Component update error: " << error;
  61 }
  62
  63 bool DefaultComponentInstaller::InstallHelper(
  64     const base::DictionaryValue& manifest,
  65     const base::FilePath& unpack_path,
  66     const base::FilePath& install_path) {
  67   if (!base::Move(unpack_path, install_path))
  68     return false;
  69   if (!installer_traits_->OnCustomInstall(manifest, install_path))
  70     return false;
  71   if (!installer_traits_->VerifyInstallation(manifest, install_path))
  72     return false;
  73   return true;
  74 }
  75
  76 bool DefaultComponentInstaller::Install(const base::DictionaryValue& manifest,
  77                                         const base::FilePath& unpack_path) {
  78   std::string manifest_version;
  79   manifest.GetStringASCII("version", &manifest_version);
  80   base::Version version(manifest_version.c_str());
  81   if (!version.IsValid())
  82     return false;
  83   if (current_version_.CompareTo(version) > 0)
  84     return false;
  85   base::FilePath install_path =
  86       installer_traits_->GetBaseDirectory().AppendASCII(version.GetString());
  87   if (base::PathExists(install_path)) {
  88     if (!base::DeleteFile(install_path, true))
  89       return false;
  90   }
  91   if (!InstallHelper(manifest, unpack_path, install_path)) {
  92     base::DeleteFile(install_path, true);
  93     return false;
  94   }
  95   current_version_ = version;
  96   // TODO(ddorwin): Change the parameter to scoped_ptr<base::DictionaryValue>
  97   // so we can avoid this DeepCopy.
  98   current_manifest_.reset(manifest.DeepCopy());
  99   scoped_ptr<base::DictionaryValue> manifest_copy(
 100       current_manifest_->DeepCopy());
 101   main_task_runner_->PostTask(
 102       FROM_HERE,
 103       base::Bind(&ComponentInstallerTraits::ComponentReady,
 104                  base::Unretained(installer_traits_.get()),
 105                  current_version_,
 106                  GetInstallDirectory(),
 107                  base::Passed(&manifest_copy)));
 108   return true;
 109 }
 110
 111 bool DefaultComponentInstaller::GetInstalledFile(
 112     const std::string& file,
 113     base::FilePath* installed_file) {
 114   if (current_version_.Equals(base::Version(kNullVersion)))
 115     return false;  // No component has been installed yet.
 116
 117   *installed_file = installer_traits_->GetBaseDirectory()
 118                         .AppendASCII(current_version_.GetString())
 119                         .AppendASCII(file);
 120   return true;
 121 }
 122
 123 void DefaultComponentInstaller::StartRegistration(ComponentUpdateService* cus) {
 124   DCHECK(task_runner_.get());
 125   DCHECK(task_runner_->RunsTasksOnCurrentThread());
 126   base::FilePath base_dir = installer_traits_->GetBaseDirectory();
 127   if (!base::PathExists(base_dir) && !base::CreateDirectory(base_dir)) {
 128     NOTREACHED() << "Could not create the base directory for "
 129                  << installer_traits_->GetName() << " ("
 130                  << base_dir.MaybeAsASCII() << ").";
 131     return;
 132   }
 133
 134   base::FilePath latest_path;
 135   base::Version latest_version(kNullVersion);
 136   scoped_ptr<base::DictionaryValue> latest_manifest;
 137
 138   std::vector<base::FilePath> older_paths;
 139   base::FileEnumerator file_enumerator(
 140       base_dir, false, base::FileEnumerator::DIRECTORIES);
 141   for (base::FilePath path = file_enumerator.Next();
 142        !path.value().empty();
 143        path = file_enumerator.Next()) {
 144     base::Version version(path.BaseName().MaybeAsASCII());
 145
 146     // Ignore folders that don't have valid version names. These folders are not
 147     // managed by component installer so do not try to remove them.
 148     if (!version.IsValid())
 149       continue;
 150
 151     // |version| not newer than the latest found version (kNullVersion if no
 152     // version has been found yet) is marked for removal.
 153     if (version.CompareTo(latest_version) <= 0) {
 154       older_paths.push_back(path);
 155       continue;
 156     }
 157
 158     scoped_ptr<base::DictionaryValue> manifest = ReadManifest(path);
 159     if (!manifest || !installer_traits_->VerifyInstallation(*manifest, path)) {
 160       DLOG(ERROR) << "Failed to read manifest or verify installation for "
 161                   << installer_traits_->GetName() << " ("
 162                   << path.MaybeAsASCII() << ").";
 163       older_paths.push_back(path);
 164       continue;
 165     }
 166
 167     // New valid |version| folder found!
 168
 169     if (latest_manifest) {
 170       DCHECK(!latest_path.empty());
 171       older_paths.push_back(latest_path);
 172     }
 173
 174     latest_path = path;
 175     latest_version = version;
 176     latest_manifest = manifest.Pass();
 177   }
 178
 179   if (latest_manifest) {
 180     current_version_ = latest_version;
 181     current_manifest_ = latest_manifest.Pass();
 182     // TODO(ddorwin): Remove these members and pass them directly to
 183     // FinishRegistration().
 184     base::ReadFileToString(latest_path.AppendASCII("manifest.fingerprint"),
 185                            &current_fingerprint_);
 186   }
 187
 188   // Remove older versions of the component. None should be in use during
 189   // browser startup.
 190   for (const auto& older_path : older_paths)
 191     base::DeleteFile(older_path, true);
 192
 193   main_task_runner_->PostTask(
 194       FROM_HERE,
 195       base::Bind(&DefaultComponentInstaller::FinishRegistration,
 196                  base::Unretained(this),
 197                  cus));
 198 }
 199
 200 base::FilePath DefaultComponentInstaller::GetInstallDirectory() {
 201   return installer_traits_->GetBaseDirectory()
 202       .AppendASCII(current_version_.GetString());
 203 }
 204
 205 void DefaultComponentInstaller::FinishRegistration(
 206     ComponentUpdateService* cus) {
 207   DCHECK(thread_checker_.CalledOnValidThread());
 208   if (installer_traits_->CanAutoUpdate()) {
 209     CrxComponent crx;
 210     crx.name = installer_traits_->GetName();
 211     crx.installer = this;
 212     crx.version = current_version_;
 213     crx.fingerprint = current_fingerprint_;
 214     installer_traits_->GetHash(&crx.pk_hash);
 215     ComponentUpdateService::Status status = cus->RegisterComponent(crx);
 216     if (status != ComponentUpdateService::kOk &&
 217         status != ComponentUpdateService::kReplaced) {
 218       NOTREACHED() << "Component registration failed for "
 219                    << installer_traits_->GetName();
 220       return;
 221     }
 222   }
 223
 224   if (!current_manifest_)
 225     return;
 226
 227   scoped_ptr<base::DictionaryValue> manifest_copy(
 228       current_manifest_->DeepCopy());
 229   installer_traits_->ComponentReady(
 230       current_version_, GetInstallDirectory(), manifest_copy.Pass());
 231 }
 232
 233 }  // namespace component_updater