src/chrome/browser/component_updater/default_component_installer.cc

   1 // Copyright 2013 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/file_util.h"
   7 #include "base/files/file_enumerator.h"
   8 #include "base/files/file_path.h"
   9 #include "base/values.h"
  10 #include "base/version.h"
  11 // TODO(ddorwin): Find a better place for ReadManifest.
  12 #include "chrome/browser/component_updater/component_unpacker.h"
  13 #include "chrome/browser/component_updater/default_component_installer.h"
  14 #include "content/public/browser/browser_thread.h"
  15
  16 namespace component_updater {
  17
  18 namespace {
  19 // Version "0" corresponds to no installed version. By the server's conventions,
  20 // we represent it as a dotted quad.
  21 const char kNullVersion[] = "0.0.0.0";
  22 }  // namespace
  23
  24 ComponentInstallerTraits::~ComponentInstallerTraits() {
  25 }
  26
  27 DefaultComponentInstaller::DefaultComponentInstaller(
  28     scoped_ptr<ComponentInstallerTraits> installer_traits)
  29     : current_version_(kNullVersion) {
  30   installer_traits_ = installer_traits.Pass();
  31 }
  32
  33 DefaultComponentInstaller::~DefaultComponentInstaller() {
  34 }
  35
  36 void DefaultComponentInstaller::Register(ComponentUpdateService* cus) {
  37   if (!installer_traits_) {
  38     NOTREACHED() << "A DefaultComponentInstaller has been created but "
  39                  << "has no installer traits.";
  40     return;
  41   }
  42   content::BrowserThread::PostBlockingPoolTask(
  43       FROM_HERE,
  44       base::Bind(&DefaultComponentInstaller::StartRegistration,
  45                  base::Unretained(this),
  46                  cus));
  47 }
  48
  49 void DefaultComponentInstaller::OnUpdateError(int error) {
  50   NOTREACHED() << "Component update error: " << error;
  51 }
  52
  53 bool DefaultComponentInstaller::InstallHelper(
  54     const base::DictionaryValue& manifest,
  55     const base::FilePath& unpack_path,
  56     const base::FilePath& install_path) {
  57   if (!base::Move(unpack_path, install_path))
  58     return false;
  59   if (!installer_traits_->OnCustomInstall(manifest, install_path))
  60     return false;
  61   if (!installer_traits_->VerifyInstallation(install_path))
  62     return false;
  63   return true;
  64 }
  65
  66 bool DefaultComponentInstaller::Install(const base::DictionaryValue& manifest,
  67                                         const base::FilePath& unpack_path) {
  68   std::string manifest_version;
  69   manifest.GetStringASCII("version", &manifest_version);
  70   base::Version version(manifest_version.c_str());
  71   if (!version.IsValid())
  72     return false;
  73   if (current_version_.CompareTo(version) > 0)
  74     return false;
  75   base::FilePath install_path =
  76       installer_traits_->GetBaseDirectory().AppendASCII(version.GetString());
  77   if (base::PathExists(install_path)) {
  78     if (!base::DeleteFile(install_path, true))
  79       return false;
  80   }
  81   if (!InstallHelper(manifest, unpack_path, install_path)) {
  82     base::DeleteFile(install_path, true);
  83     return false;
  84   }
  85   current_version_ = version;
  86   // TODO(ddorwin): Change the parameter to scoped_ptr<base::DictionaryValue>
  87   // so we can avoid this DeepCopy.
  88   current_manifest_.reset(manifest.DeepCopy());
  89   scoped_ptr<base::DictionaryValue> manifest_copy(
  90       current_manifest_->DeepCopy());
  91   content::BrowserThread::PostTask(
  92       content::BrowserThread::UI,
  93       FROM_HERE,
  94       base::Bind(&ComponentInstallerTraits::ComponentReady,
  95                  base::Unretained(installer_traits_.get()),
  96                  current_version_,
  97                  GetInstallDirectory(),
  98                  base::Passed(&manifest_copy)));
  99   return true;
 100 }
 101
 102 bool DefaultComponentInstaller::GetInstalledFile(
 103     const std::string& file,
 104     base::FilePath* installed_file) {
 105   if (current_version_.Equals(base::Version(kNullVersion)))
 106     return false;  // No component has been installed yet.
 107
 108   *installed_file = installer_traits_->GetBaseDirectory()
 109                         .AppendASCII(current_version_.GetString())
 110                         .AppendASCII(file);
 111   return true;
 112 }
 113
 114 void DefaultComponentInstaller::StartRegistration(ComponentUpdateService* cus) {
 115   base::FilePath base_dir = installer_traits_->GetBaseDirectory();
 116   if (!base::PathExists(base_dir) && !base::CreateDirectory(base_dir)) {
 117     NOTREACHED() << "Could not create the base directory for "
 118                  << installer_traits_->GetName() << " ("
 119                  << base_dir.MaybeAsASCII() << ").";
 120     return;
 121   }
 122
 123   base::FilePath latest_dir;
 124   base::Version latest_version(kNullVersion);
 125   std::vector<base::FilePath> older_dirs;
 126   bool found = false;
 127   base::FileEnumerator file_enumerator(
 128       base_dir, false, base::FileEnumerator::DIRECTORIES);
 129   for (base::FilePath path = file_enumerator.Next();
 130        !path.value().empty();
 131        path = file_enumerator.Next()) {
 132     base::Version version(path.BaseName().MaybeAsASCII());
 133     // Ignore folders that don't have valid version names. These folders are not
 134     // managed by component installer so do not try to remove them.
 135     if (!version.IsValid())
 136       continue;
 137     if (!installer_traits_->VerifyInstallation(path)) {
 138       older_dirs.push_back(path);
 139       continue;
 140     }
 141     if (found) {
 142       if (version.CompareTo(latest_version) > 0) {
 143         older_dirs.push_back(latest_dir);
 144         latest_dir = path;
 145         latest_version = version;
 146       } else {
 147         older_dirs.push_back(path);
 148       }
 149     } else {
 150       latest_dir = path;
 151       latest_version = version;
 152       found = true;
 153     }
 154   }
 155
 156   if (found) {
 157     current_version_ = latest_version;
 158     // TODO(ddorwin): Remove these members and pass them directly to
 159     // FinishRegistration().
 160     base::ReadFileToString(latest_dir.AppendASCII("manifest.fingerprint"),
 161                            &current_fingerprint_);
 162     current_manifest_ = ReadManifest(latest_dir);
 163     if (!current_manifest_) {
 164       DLOG(ERROR) << "Failed to read manifest for "
 165                   << installer_traits_->GetName() << " ("
 166                   << base_dir.MaybeAsASCII() << ").";
 167       return;
 168     }
 169   }
 170
 171   // Remove older versions of the component. None should be in use during
 172   // browser startup.
 173   for (std::vector<base::FilePath>::iterator iter = older_dirs.begin();
 174        iter != older_dirs.end();
 175        ++iter) {
 176     base::DeleteFile(*iter, true);
 177   }
 178
 179   content::BrowserThread::PostTask(
 180       content::BrowserThread::UI,
 181       FROM_HERE,
 182       base::Bind(&DefaultComponentInstaller::FinishRegistration,
 183                  base::Unretained(this),
 184                  cus));
 185 }
 186
 187 base::FilePath DefaultComponentInstaller::GetInstallDirectory() {
 188   return installer_traits_->GetBaseDirectory()
 189       .AppendASCII(current_version_.GetString());
 190 }
 191
 192 void DefaultComponentInstaller::FinishRegistration(
 193     ComponentUpdateService* cus) {
 194   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 195   if (installer_traits_->CanAutoUpdate()) {
 196     CrxComponent crx;
 197     crx.name = installer_traits_->GetName();
 198     crx.installer = this;
 199     crx.version = current_version_;
 200     crx.fingerprint = current_fingerprint_;
 201     installer_traits_->GetHash(&crx.pk_hash);
 202     ComponentUpdateService::Status status = cus->RegisterComponent(crx);
 203     if (status != ComponentUpdateService::kOk &&
 204         status != ComponentUpdateService::kReplaced) {
 205       NOTREACHED() << "Component registration failed for "
 206                    << installer_traits_->GetName();
 207       return;
 208     }
 209   }
 210
 211   if (current_version_.CompareTo(base::Version(kNullVersion)) > 0) {
 212     scoped_ptr<base::DictionaryValue> manifest_copy(
 213         current_manifest_->DeepCopy());
 214     installer_traits_->ComponentReady(
 215         current_version_, GetInstallDirectory(), manifest_copy.Pass());
 216   }
 217 }
 218
 219 }  // namespace component_updater