Add a component updater for the CLD2 data file.

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 "base/bind.h"
+#include "base/file_util.h"
+#include "base/files/file_path.h"
+#include "base/lazy_instance.h"
+#include "base/path_service.h"
+#include "base/platform_file.h"
+#include "chrome/browser/component_updater/default_component_installer.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.
+base::LazyInstance<base::Lock> s_file_lock_ = LAZY_INSTANCE_INITIALIZER;

[Sorin Jianu, 2014/04/22 17:10:49]

There should not be a trailing _.
Naming convention for globals, per coding style:

There are no special requirements for global variables, which should be rare in
any case, but if you use one, consider prefixing it with g_ or some other marker
to easily distinguish it from local variables.

+
+struct CLDFilePathWrapper {

[Sorin Jianu, 2014/04/22 17:10:49]

Why do we need the wrapper? Can we just say:
base::LazyInstance<base::FilePath>::Leaky s_file_

Also, we could consider more descriptive names for this identifier, which has a
larger visibility than most other identifiers in this module.

+  CLDFilePathWrapper() {
+  }
+  base::FilePath value;
+};
+base::LazyInstance<CLDFilePathWrapper>::Leaky s_file_;
+
+}
+
+namespace component_updater {
+
+// kPublicKeySHA256 is the SHA256 hash of the SubjectPublicKeyInfo of the key
+// that's used to sign generated CRL sets.
+// The extension id is: dpedmmgabcgnikllifiidmijgoiihfgf
+const uint8 kPublicKeySHA256[32] = {

[Sorin Jianu, 2014/04/22 17:10:49]

kPublicKeySHA256 and kCldManifestName could be members in the anon namespace
above. I think.

+  0xe8, 0xce, 0xcf, 0x42, 0x06, 0xd0, 0x93, 0x49,
+  0x6d, 0xd9, 0x89, 0xe1, 0x41, 0x04, 0x86, 0x4a,
+  0x8f, 0xbd, 0x86, 0x12, 0xb9, 0x58, 0x9b, 0xfb,
+  0x4f, 0xbb, 0x1b, 0xa9, 0xd3, 0x85, 0x37, 0xef
+};
+
+const char kCldManifestName[] = "CLD2 Data";
+
+class CldComponentInstallerTraits : public ComponentInstallerTraits {
+ public:
+  CldComponentInstallerTraits();
+  virtual ~CldComponentInstallerTraits() {}
+
+ private:
+  // The following methods override ComponentInstallerTraits.
+  virtual bool CanAutoUpdate() const OVERRIDE;
+  virtual bool OnCustomInstall(const base::DictionaryValue& manifest,
+                               const base::FilePath& install_dir) OVERRIDE;
+  virtual bool VerifyInstallation(
+      const base::FilePath& install_dir) const OVERRIDE;
+  virtual void ComponentReady(
+      const base::Version& version,
+      const base::FilePath& path,
+      scoped_ptr<base::DictionaryValue> manifest) OVERRIDE;
+  virtual base::FilePath GetBaseDirectory() const OVERRIDE;
+  virtual void GetHash(std::vector<uint8>* hash) const OVERRIDE;
+  virtual std::string GetName() const OVERRIDE;
+
+  void SetLatestCldDataFile(const base::FilePath& path);
+  DISALLOW_COPY_AND_ASSIGN(CldComponentInstallerTraits);
+};
+
+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.
+}
+
+void CldComponentInstallerTraits::ComponentReady(
+    const base::Version& version,
+    const base::FilePath& path,
+    scoped_ptr<base::DictionaryValue> manifest) {
+  base::FilePath source_path = path.Append(chrome::kCLDDataFilename);
+  SetLatestCldDataFile(source_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.
+  return base::PathExists(install_dir.Append(chrome::kCLDDataFilename));
+}
+
+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) {
+  base::AutoLock lock(s_file_lock_.Get());
+  s_file_.Get().value = path;
+}
+
+bool GetLatestCldDataFile(base::FilePath* path) {
+  base::AutoLock lock(s_file_lock_.Get());
+  base::FilePath cached = s_file_.Get().value;

[Sorin Jianu, 2014/04/22 17:10:49]

const base::FilePath cached

+  if (cached.empty() || !base::PathExists(cached)) return false;
+  *path = cached;
+  return true;
+}
+
+}  // namespace component_updater