Add SSL error assistant component to dynamically update captive portal list

chrome/browser/component_updater/ssl_error_assistant_component_installer.cc

+// Copyright 2017 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/ssl_error_assistant_component_installer.h"
+
+#include <memory>
+
+#include "base/bind.h"
+#include "base/files/file_util.h"
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "chrome/browser/ssl/ssl_error_handler.h"
+#include "content/public/browser/browser_thread.h"
+
+using component_updater::ComponentUpdateService;
+
+namespace {
+
+const base::FilePath::CharType kConfigBinaryPbFileName[] =
+    FILE_PATH_LITERAL("ssl_error_assistant.pb");
+
+// The SHA256 of the SubjectPublicKeyInfo used to sign the extension.
+// The extension id is: giekcmmlnklenlaomppkphknjmnnpneh
+const uint8_t kPublicKeySHA256[32] = {
+    0x68, 0x4a, 0x2c, 0xcb, 0xda, 0xb4, 0xdb, 0x0e, 0xcf, 0xfa, 0xf7,
+    0xad, 0x9c, 0xdd, 0xfd, 0x47, 0x97, 0xe4, 0x73, 0x24, 0x67, 0x93,
+    0x9c, 0xb1, 0x14, 0xcd, 0x3f, 0x54, 0x66, 0x25, 0x99, 0x3f};
+
+void LoadProtoFromDisk(const base::FilePath& pb_path) {
+  if (pb_path.empty())
+    return;
+
+  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.
+    DVLOG(1) << "Failed reading from " << pb_path.value();
+    return;
+  }
+  auto proto = base::MakeUnique<chrome_browser_ssl::SSLErrorAssistantConfig>();
+  if (!proto->ParseFromString(binary_pb)) {
+    DVLOG(1) << "Failed parsing proto " << pb_path.value();
+    return;
+  }
+  content::BrowserThread::PostTask(
+      content::BrowserThread::UI, FROM_HERE,
+      base::Bind(&SSLErrorHandler::SetErrorAssistantProto,
+                 base::Passed(std::move(proto))));
+}
+
+}  // namespace
+
+namespace component_updater {
+
+bool SSLErrorAssistantComponentInstallerTraits::
+    SupportsGroupPolicyEnabledComponentUpdates() const {
+  return false;
+}
+
+bool SSLErrorAssistantComponentInstallerTraits::RequiresNetworkEncryption()
+    const {
+  return false;
+}
+
+update_client::CrxInstaller::Result
+SSLErrorAssistantComponentInstallerTraits::OnCustomInstall(
+    const base::DictionaryValue& manifest,
+    const base::FilePath& install_dir) {
+  return update_client::CrxInstaller::Result(0);  // Nothing custom here.
+}
+
+base::FilePath SSLErrorAssistantComponentInstallerTraits::GetInstalledPath(
+    const base::FilePath& base) {
+  return base.Append(kConfigBinaryPbFileName);
+}
+
+void SSLErrorAssistantComponentInstallerTraits::ComponentReady(
+    const base::Version& version,
+    const base::FilePath& install_dir,
+    std::unique_ptr<base::DictionaryValue> manifest) {
+  DVLOG(1) << "Component ready, version " << version.GetString() << " in "
+           << install_dir.value();
+
+  if (!content::BrowserThread::PostBlockingPoolTask(
+          FROM_HERE,
+          base::Bind(&LoadProtoFromDisk, GetInstalledPath(install_dir)))) {
+    NOTREACHED();
+  }
+}
+
+// Called during startup and installation before ComponentReady().
+bool SSLErrorAssistantComponentInstallerTraits::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
+SSLErrorAssistantComponentInstallerTraits::GetRelativeInstallDir() const {
+  return base::FilePath(FILE_PATH_LITERAL("SSLErrorAssistant"));
+}
+
+void SSLErrorAssistantComponentInstallerTraits::GetHash(
+    std::vector<uint8_t>* hash) const {
+  hash->assign(kPublicKeySHA256,
+               kPublicKeySHA256 + arraysize(kPublicKeySHA256));
+}
+
+std::string SSLErrorAssistantComponentInstallerTraits::GetName() const {
+  return "SSL Error Assistant";
+}
+
+update_client::InstallerAttributes
+SSLErrorAssistantComponentInstallerTraits::GetInstallerAttributes() const {
+  return update_client::InstallerAttributes();
+}
+
+std::vector<std::string>
+SSLErrorAssistantComponentInstallerTraits::GetMimeTypes() const {
+  return std::vector<std::string>();
+}
+
+void RegisterSSLErrorAssistantComponent(ComponentUpdateService* cus,
+                                        const base::FilePath& user_data_dir) {
+  DVLOG(1) << "Registering SSL Error Assistant component.";
+
+  std::unique_ptr<ComponentInstallerTraits> traits(
+      new SSLErrorAssistantComponentInstallerTraits());
+  // |cus| takes ownership of |installer|.
+  DefaultComponentInstaller* installer =
+      new DefaultComponentInstaller(std::move(traits));
+  installer->Register(cus, base::Closure());
+}
+
+}  // namespace component_updater