Component updater for FileTypePolicies.

chrome/browser/component_updater/file_type_policies_component_installer.cc

+// Copyright 2016 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/file_type_policies_component_installer.h"
+
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/path_service.h"
+#include "base/version.h"
+#include "chrome/common/safe_browsing/file_type_policies.h"
+#include "components/component_updater/component_updater_paths.h"
+#include "content/public/browser/browser_thread.h"
+
+using component_updater::ComponentUpdateService;
+
+namespace {
+const base::FilePath::CharType kFileTypePoliciesBinaryPbFileName[] =
+    FILE_PATH_LITERAL("download_file_types.pb");
+
+// The SHA256 of the SubjectPublicKeyInfo used to sign the extension.
+// The extension id is: khaoiebndkojlmppeemjhbpbandiljpe
+const uint8_t kPublicKeySHA256[32] = {
+    0xa7, 0x0e, 0x84, 0x1d, 0x3a, 0xe9, 0xbc, 0xff, 0x44, 0xc9, 0x71,
+    0xf1, 0x0d, 0x38, 0xb9, 0xf4, 0x65, 0x92, 0x31, 0x01, 0x47, 0x3f,
+    0x1b, 0x7c, 0x11, 0xb0, 0x85, 0x0f, 0xa3, 0xfd, 0xe1, 0xe5};
+
+const char kFileTypePoliciesManifestName[] = "File Type Policies";
+
+void LoadFileTypesFromDisk(const base::FilePath& pb_path) {
+  if (pb_path.empty())
+    return;
+
+  VLOG(1) << "Reading Download File Types from file: " << pb_path.value();
+  std::string binary_pb;
+  if (!base::ReadFileToString(pb_path, &binary_pb)) {
+    // The file won't exist on new installations, so this is not always an
+    // error.
+    VLOG(1) << "Failed reading from " << pb_path.value();
+    return;
+  }
+
+  safe_browsing::FileTypePolicies::GetInstance()->PopulateFromDynamicUpdate(
+      binary_pb);
+}
+
+}  // namespace
+
+namespace component_updater {
+
+bool FileTypePoliciesComponentInstallerTraits::CanAutoUpdate() const {
+  return true;
+}
+
+bool FileTypePoliciesComponentInstallerTraits::RequiresNetworkEncryption()
+    const {
+  return false;
+}
+
+bool FileTypePoliciesComponentInstallerTraits::OnCustomInstall(
+    const base::DictionaryValue& manifest,
+    const base::FilePath& install_dir) {
+  return true;  // Nothing custom here.
+}
+
+base::FilePath FileTypePoliciesComponentInstallerTraits::GetInstalledPath(
+    const base::FilePath& base) {
+  return base.Append(kFileTypePoliciesBinaryPbFileName);
+}
+
+void FileTypePoliciesComponentInstallerTraits::ComponentReady(
+    const base::Version& version,
+    const base::FilePath& install_dir,
+    std::unique_ptr<base::DictionaryValue> manifest) {
+  VLOG(1) << "Component ready, version " << version.GetString() << " in "
+          << install_dir.value();
+
+  if (!content::BrowserThread::PostBlockingPoolTask(
+          FROM_HERE,
+          base::Bind(&LoadFileTypesFromDisk, GetInstalledPath(install_dir)))) {
+    NOTREACHED();
+  }
+}
+
+// Called during startup and installation before ComponentReady().
+bool FileTypePoliciesComponentInstallerTraits::VerifyInstallation(
+    const base::DictionaryValue& manifest,
+    const base::FilePath& install_dir) const {
+  // No need to actually validate the proto here, since we'll do the checking
+  // in PopulateFromDynamicUpdate().
+  return base::PathExists(GetInstalledPath(install_dir));
+}
+
+base::FilePath FileTypePoliciesComponentInstallerTraits::GetRelativeInstallDir()
+    const {
+  return base::FilePath(FILE_PATH_LITERAL("FileTypePolicies"));
+}
+
+void FileTypePoliciesComponentInstallerTraits::GetHash(
+    std::vector<uint8_t>* hash) const {
+  hash->assign(kPublicKeySHA256,
+               kPublicKeySHA256 + arraysize(kPublicKeySHA256));
+}
+
+std::string FileTypePoliciesComponentInstallerTraits::GetName() const {
+  return kFileTypePoliciesManifestName;
+}
+
+std::string FileTypePoliciesComponentInstallerTraits::GetAp() const {
+  return std::string();
+}
+
+void RegisterFileTypePoliciesComponent(ComponentUpdateService* cus,
+                                       const base::FilePath& user_data_dir) {
+  VLOG(1) << "Registering File Type Policies component.";
+
+  std::unique_ptr<ComponentInstallerTraits> traits(
+      new FileTypePoliciesComponentInstallerTraits());
+  // |cus| will take ownership of |installer| during installer->Register(cus).
+  DefaultComponentInstaller* installer =
+      new DefaultComponentInstaller(std::move(traits));
+  installer->Register(cus, base::Closure());
+}
+
+}  // namespace component_updater