Refactor loading out of ExtensionService.

chrome/browser/extensions/component_loader.cc

+// Copyright (c) 2011 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/extensions/component_loader.h"
+
+#include "base/command_line.h"
+#include "base/path_service.h"
+#include "base/json/json_value_serializer.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/common/extensions/extension.h"
+#include "grit/browser_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+
+namespace {
+
+typedef std::list<std::pair<FilePath::StringType, int> >
+    ComponentExtensionList;
+
+#if defined(FILE_MANAGER_EXTENSION)
+void AddFileManagerExtension(ComponentExtensionList* component_extensions) {
+#ifndef NDEBUG
+  const CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kFileManagerExtensionPath)) {
+    FilePath filemgr_extension_path =
+        command_line->GetSwitchValuePath(switches::kFileManagerExtensionPath);
+    component_extensions->push_back(std::make_pair(
+        filemgr_extension_path.value(),
+        IDR_FILEMANAGER_MANIFEST));
+    return;
+  }
+#endif  // NDEBUG
+  component_extensions->push_back(std::make_pair(
+      FILE_PATH_LITERAL("file_manager"),
+      IDR_FILEMANAGER_MANIFEST));
+}
+#endif  // defined(FILE_MANAGER_EXTENSION)
+
+}  // namespace
+
+bool ComponentLoader::ComponentExtensionInfo::Equals(
+    const ComponentExtensionInfo& other) const {
+  return other.manifest == manifest && other.root_directory == root_directory;
+}
+
+ComponentLoader::ComponentLoader(ExtensionService* extension_service)
+    : extension_service_(extension_service) {
+}
+
+ComponentLoader::~ComponentLoader() {
+}
+
+void ComponentLoader::LoadComponentExtensions() {
+  for (RegisteredComponentExtensions::iterator it =
+           component_extension_manifests_.begin();
+       it != component_extension_manifests_.end(); ++it) {
+    LoadComponentExtension(*it);
+  }
+}
+
+const Extension* ComponentLoader::LoadComponentExtension(
+    const ComponentExtensionInfo &info) {
+  JSONStringValueSerializer serializer(info.manifest);
+  scoped_ptr<Value> manifest(serializer.Deserialize(NULL, NULL));
+  if (!manifest.get()) {
+    LOG(ERROR) << "Failed to parse manifest for extension";
+    return NULL;
+  }
+
+  int flags = Extension::REQUIRE_KEY;
+  if (Extension::ShouldDoStrictErrorChecking(Extension::COMPONENT))
+    flags |= Extension::STRICT_ERROR_CHECKS;
+  std::string error;
+  scoped_refptr<const Extension> extension(Extension::Create(
+      info.root_directory,
+      Extension::COMPONENT,
+      *static_cast<DictionaryValue*>(manifest.get()),
+      flags,
+      &error));
+  if (!extension.get()) {
+    LOG(ERROR) << error;
+    return NULL;
+  }
+  extension_service_->AddExtension(extension);
+  return extension;
+}
+
+void ComponentLoader::UnloadComponentExtension(
+    const ComponentExtensionInfo& info) {
+  JSONStringValueSerializer serializer(info.manifest);
+  scoped_ptr<Value> manifest(serializer.Deserialize(NULL, NULL));
+  if (!manifest.get()) {
+    LOG(ERROR) << "Failed to parse manifest for extension";
+    return;
+  }
+  std::string public_key;
+  std::string public_key_bytes;
+  std::string id;
+  if (!static_cast<DictionaryValue*>(manifest.get())->
+      GetString(extension_manifest_keys::kPublicKey, &public_key) ||
+      !Extension::ParsePEMKeyBytes(public_key, &public_key_bytes) ||
+      !Extension::GenerateId(public_key_bytes, &id)) {
+    LOG(ERROR) << "Failed to get extension id";
+    return;
+  }
+  extension_service_->
+      UnloadExtension(id, extension_misc::UNLOAD_REASON_DISABLE);
+}
+
+// We take ComponentExtensionList:
+// path, manifest ID => full manifest, absolute path
+void ComponentLoader::RegisterDefaultComponentExtensions() {
+  ComponentExtensionList component_extensions;
+
+  // Bookmark manager.
+  component_extensions.push_back(std::make_pair(
+      FILE_PATH_LITERAL("bookmark_manager"),
+      IDR_BOOKMARKS_MANIFEST));
+
+#if defined(FILE_MANAGER_EXTENSION)
+  AddFileManagerExtension(&component_extensions);
+#endif
+
+#if defined(TOUCH_UI)
+  component_extensions.push_back(std::make_pair(
+      FILE_PATH_LITERAL("keyboard"),
+      IDR_KEYBOARD_MANIFEST));
+#endif
+
+#if defined(OS_CHROMEOS)
+    component_extensions.push_back(std::make_pair(
+        FILE_PATH_LITERAL("/usr/share/chromeos-assets/mobile"),
+        IDR_MOBILE_MANIFEST));
+
+    const CommandLine* command_line = CommandLine::ForCurrentProcess();
+    if (command_line->HasSwitch(switches::kAuthExtensionPath)) {
+      FilePath auth_extension_path =
+          command_line->GetSwitchValuePath(switches::kAuthExtensionPath);
+      component_extensions.push_back(std::make_pair(
+          auth_extension_path.value(),
+          IDR_GAIA_TEST_AUTH_MANIFEST));
+    } else {
+      component_extensions.push_back(std::make_pair(
+          FILE_PATH_LITERAL("/usr/share/chromeos-assets/gaia_auth"),
+          IDR_GAIA_AUTH_MANIFEST));
+    }
+
+#if defined(OFFICIAL_BUILD)
+    if (browser_defaults::enable_help_app) {
+      component_extensions.push_back(std::make_pair(
+          FILE_PATH_LITERAL("/usr/share/chromeos-assets/helpapp"),
+          IDR_HELP_MANIFEST));
+    }
+#endif
+#endif
+
+  // Web Store.
+  component_extensions.push_back(std::make_pair(
+      FILE_PATH_LITERAL("web_store"),
+      IDR_WEBSTORE_MANIFEST));
+
+#if !defined(OS_CHROMEOS)
+  // Cloud Print component app. Not required on Chrome OS.
+  component_extensions.push_back(std::make_pair(
+      FILE_PATH_LITERAL("cloud_print"),
+      IDR_CLOUDPRINT_MANIFEST));
+#endif  // !defined(OS_CHROMEOS)
+
+  for (ComponentExtensionList::iterator iter = component_extensions.begin();
+    iter != component_extensions.end(); ++iter) {
+    FilePath path(iter->first);
+    if (!path.IsAbsolute()) {
+      if (PathService::Get(chrome::DIR_RESOURCES, &path)) {
+        path = path.Append(iter->first);
+      } else {
+        NOTREACHED();
+      }
+    }
+
+    std::string manifest =
+        ResourceBundle::GetSharedInstance().GetRawDataResource(
+            iter->second).as_string();
+    RegisterComponentExtension(ComponentExtensionInfo(manifest, path));
+  }
+
+#if defined(OS_CHROMEOS)
+  // Register access extensions only if accessibility is enabled.
+  if (g_browser_process->local_state()->
+      GetBoolean(prefs::kAccessibilityEnabled)) {
+    FilePath path = FilePath(extension_misc::kAccessExtensionPath)
+        .AppendASCII(extension_misc::kChromeVoxDirectoryName);
+    std::string manifest =
+        ResourceBundle::GetSharedInstance().GetRawDataResource(
+            IDR_CHROMEVOX_MANIFEST).as_string();
+    RegisterComponentExtension(ComponentExtensionInfo(manifest, path));
+  }
+#endif
+}
+
+void ComponentLoader::UnregisterComponentExtension(
+    const ComponentExtensionInfo& info) {
+  RegisteredComponentExtensions new_component_extension_manifests;
+  for (RegisteredComponentExtensions::iterator it =
+           component_extension_manifests_.begin();
+       it != component_extension_manifests_.end(); ++it) {
+    if (!it->Equals(info))
+      new_component_extension_manifests.push_back(*it);
+  }
+  component_extension_manifests_.swap(new_component_extension_manifests);
+}