chrome/browser/component_updater/cld_component_installer.cc

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/component_updater/cld_component_installer.h"

#include <string>
#include <vector>

#include "base/bind.h"
#include "base/file_util.h"
#include "base/files/file_path.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/platform_file.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/chrome_constants.h"
#include "chrome/common/chrome_paths.h"
#include "content/public/browser/browser_thread.h"
#include "net/ssl/ssl_config_service.h"

using component_updater::ComponentUpdateService;
using content::BrowserThread;

namespace {

// Once we have acquired a valid file from the component installer, we need to
// make the path available to other parts of the system such as the
// translation libraries. We create a global to hold onto the path, and a
// lock to guard it. See GetLatestCldDataFile(...) for more info.
base::LazyInstance<base::Lock> cld_file_lock = LAZY_INSTANCE_INITIALIZER;
base::LazyInstance<base::FilePath> cld_file = LAZY_INSTANCE_INITIALIZER;

}

namespace component_updater {

// The SHA256 of the SubjectPublicKeyInfo used to sign the extension.
// The extension id is: dpedmmgabcgnikllifiidmijgoiihfgf
const uint8 kPublicKeySHA256[32] = {
    0x3f, 0x43, 0xcc, 0x60, 0x12, 0x6d, 0x8a, 0xbb,
    0x85, 0x88, 0x3c, 0x89, 0x6e, 0x88, 0x75, 0x65,
    0xb9, 0x46, 0x09, 0xe8, 0xca, 0x92, 0xdd, 0x82,
    0x4e, 0x6d, 0x0e, 0xe6, 0x79, 0x8a, 0x87, 0xf5
};

const char kCldManifestName[] = "CLD2 Data";

CldComponentInstallerTraits::CldComponentInstallerTraits() {
}

bool CldComponentInstallerTraits::CanAutoUpdate() const {
  return true;
}

bool CldComponentInstallerTraits::OnCustomInstall(
    const base::DictionaryValue& manifest,
    const base::FilePath& install_dir) {
  return true;  // Nothing custom here.
}

base::FilePath CldComponentInstallerTraits::GetInstalledPath(
    const base::FilePath& base) {
  // Currently, all platforms have the file at the same location because there
  // is no binary difference in the generated file on any supported platform.
  // NB: This may change when 64-bit is officially supported.
  return base.Append(FILE_PATH_LITERAL("_platform_specific"))
      .Append(FILE_PATH_LITERAL("all"))
      .Append(chrome::kCLDDataFilename);
}

void CldComponentInstallerTraits::ComponentReady(
    const base::Version& version,
    const base::FilePath& path,
    scoped_ptr<base::DictionaryValue> manifest) {
  VLOG(1) << "Component ready, version " << version.GetString() << " in "
          << path.value();
  SetLatestCldDataFile(GetInstalledPath(path));
}

bool CldComponentInstallerTraits::VerifyInstallation(
    const base::FilePath& install_dir) const {
  // We can't really do much to verify the CLD2 data file. In theory we could
  // read the headers, but that won't do much other than tell us whether or
  // not the headers are valid. So just check if the file exists.
  const base::FilePath expected_file = GetInstalledPath(install_dir);
  VLOG(1) << "Verifying install: " << expected_file.value();
  const bool result = base::PathExists(expected_file);
  VLOG(1) << "Verification result: " << (result ? "valid" : "invalid");
  return result;
}

base::FilePath CldComponentInstallerTraits::GetBaseDirectory() const {
  base::FilePath result;
  PathService::Get(chrome::DIR_COMPONENT_CLD2, &result);
  return result;
}

void CldComponentInstallerTraits::GetHash(std::vector<uint8>* hash) const {
  hash->assign(kPublicKeySHA256,
               kPublicKeySHA256 + arraysize(kPublicKeySHA256));
}

std::string CldComponentInstallerTraits::GetName() const {
  return kCldManifestName;
}

void RegisterCldComponent(ComponentUpdateService* cus) {
  scoped_ptr<ComponentInstallerTraits> traits(
      new CldComponentInstallerTraits());
  // |cus| will take ownership of |installer| during installer->Register(cus).
  DefaultComponentInstaller* installer =
      new DefaultComponentInstaller(traits.Pass());
  installer->Register(cus);
}

void CldComponentInstallerTraits::SetLatestCldDataFile(
    const base::FilePath& path) {
  VLOG(1) << "Setting CLD data file location: " << path.value();
  base::AutoLock lock(cld_file_lock.Get());
  cld_file.Get() = path;
}

base::FilePath GetLatestCldDataFile() {
  base::AutoLock lock(cld_file_lock.Get());
  // cld_file is an empty path by default, meaning "file not available yet".
  return cld_file.Get();
}

}  // namespace component_updater