Revert 232631 - Revert 232499 "Move ManifestHandler to top-level extensions."

chrome/common/extensions/manifest_handler.cc

-// Copyright (c) 2013 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/common/extensions/manifest_handler.h"
-
-#include <map>
-
-#include "base/logging.h"
-#include "base/stl_util.h"
-#include "chrome/common/extensions/extension.h"
-
-namespace extensions {
-
-namespace {
-
-static base::LazyInstance<ManifestHandlerRegistry> g_registry =
-    LAZY_INSTANCE_INITIALIZER;
-static ManifestHandlerRegistry* g_registry_override = NULL;
-
-ManifestHandlerRegistry* GetRegistry() {
-  if (!g_registry_override)
-    return g_registry.Pointer();
-  return g_registry_override;
-}
-
-}  // namespace
-
-ManifestHandler::ManifestHandler() {
-}
-
-ManifestHandler::~ManifestHandler() {
-}
-
-bool ManifestHandler::Validate(const Extension* extension,
-                               std::string* error,
-                               std::vector<InstallWarning>* warnings) const {
-  return true;
-}
-
-bool ManifestHandler::AlwaysParseForType(Manifest::Type type) const {
-  return false;
-}
-
-bool ManifestHandler::AlwaysValidateForType(Manifest::Type type) const {
-  return false;
-}
-
-const std::vector<std::string> ManifestHandler::PrerequisiteKeys() const {
-  return std::vector<std::string>();
-}
-
-void ManifestHandler::Register() {
-  linked_ptr<ManifestHandler> this_linked(this);
-  const std::vector<std::string> keys = Keys();
-  for (size_t i = 0; i < keys.size(); ++i)
-    GetRegistry()->RegisterManifestHandler(keys[i], this_linked);
-}
-
-// static
-void ManifestHandler::FinalizeRegistration() {
-  GetRegistry()->Finalize();
-}
-
-// static
-bool ManifestHandler::IsRegistrationFinalized() {
-  return GetRegistry()->is_finalized_;
-}
-
-// static
-bool ManifestHandler::ParseExtension(Extension* extension, string16* error) {
-  return GetRegistry()->ParseExtension(extension, error);
-}
-
-// static
-bool ManifestHandler::ValidateExtension(const Extension* extension,
-                                        std::string* error,
-                                        std::vector<InstallWarning>* warnings) {
-  return GetRegistry()->ValidateExtension(extension, error, warnings);
-}
-
-// static
-const std::vector<std::string> ManifestHandler::SingleKey(
-    const std::string& key) {
-  return std::vector<std::string>(1, key);
-}
-
-ManifestHandlerRegistry::ManifestHandlerRegistry() : is_finalized_(false) {
-}
-
-ManifestHandlerRegistry::~ManifestHandlerRegistry() {
-}
-
-void ManifestHandlerRegistry::Finalize() {
-  CHECK(!is_finalized_);
-  SortManifestHandlers();
-  is_finalized_ = true;
-}
-
-void ManifestHandlerRegistry::RegisterManifestHandler(
-    const std::string& key, linked_ptr<ManifestHandler> handler) {
-  CHECK(!is_finalized_);
-  handlers_[key] = handler;
-}
-
-bool ManifestHandlerRegistry::ParseExtension(Extension* extension,
-                                             string16* error) {
-  std::map<int, ManifestHandler*> handlers_by_priority;
-  for (ManifestHandlerMap::iterator iter = handlers_.begin();
-       iter != handlers_.end(); ++iter) {
-    ManifestHandler* handler = iter->second.get();
-    if (extension->manifest()->HasPath(iter->first) ||
-        handler->AlwaysParseForType(extension->GetType())) {
-      handlers_by_priority[priority_map_[handler]] = handler;
-    }
-  }
-  for (std::map<int, ManifestHandler*>::iterator iter =
-           handlers_by_priority.begin();
-       iter != handlers_by_priority.end(); ++iter) {
-    if (!(iter->second)->Parse(extension, error))
-      return false;
-  }
-  return true;
-}
-
-bool ManifestHandlerRegistry::ValidateExtension(
-    const Extension* extension,
-    std::string* error,
-    std::vector<InstallWarning>* warnings) {
-  std::set<ManifestHandler*> handlers;
-  for (ManifestHandlerMap::iterator iter = handlers_.begin();
-       iter != handlers_.end(); ++iter) {
-    ManifestHandler* handler = iter->second.get();
-    if (extension->manifest()->HasPath(iter->first) ||
-        handler->AlwaysValidateForType(extension->GetType())) {
-      handlers.insert(handler);
-    }
-  }
-  for (std::set<ManifestHandler*>::iterator iter = handlers.begin();
-       iter != handlers.end(); ++iter) {
-    if (!(*iter)->Validate(extension, error, warnings))
-      return false;
-  }
-  return true;
-}
-
-// static
-ManifestHandlerRegistry* ManifestHandlerRegistry::SetForTesting(
-    ManifestHandlerRegistry* new_registry) {
-  ManifestHandlerRegistry* old_registry = GetRegistry();
-  if (new_registry != g_registry.Pointer())
-    g_registry_override = new_registry;
-  else
-    g_registry_override = NULL;
-  return old_registry;
-}
-
-void ManifestHandlerRegistry::SortManifestHandlers() {
-  std::set<ManifestHandler*> unsorted_handlers;
-  for (ManifestHandlerMap::const_iterator iter = handlers_.begin();
-       iter != handlers_.end(); ++iter) {
-    unsorted_handlers.insert(iter->second.get());
-  }
-
-  int priority = 0;
-  while (true) {
-    std::set<ManifestHandler*> next_unsorted_handlers;
-    for (std::set<ManifestHandler*>::const_iterator iter =
-             unsorted_handlers.begin();
-         iter != unsorted_handlers.end(); ++iter) {
-      ManifestHandler* handler = *iter;
-      const std::vector<std::string>& prerequisites =
-          handler->PrerequisiteKeys();
-      int unsatisfied = prerequisites.size();
-      for (size_t i = 0; i < prerequisites.size(); ++i) {
-        ManifestHandlerMap::const_iterator prereq_iter =
-            handlers_.find(prerequisites[i]);
-        // If the prerequisite does not exist, crash.
-        CHECK(prereq_iter != handlers_.end())
-            << "Extension manifest handler depends on unrecognized key "
-            << prerequisites[i];
-        // Prerequisite is in our map.
-        if (ContainsKey(priority_map_, prereq_iter->second.get()))
-          unsatisfied--;
-      }
-      if (unsatisfied == 0) {
-        priority_map_[handler] = priority;
-        priority++;
-      } else {
-        // Put in the list for next time.
-        next_unsorted_handlers.insert(handler);
-      }
-    }
-    if (next_unsorted_handlers.size() == unsorted_handlers.size())
-      break;
-    unsorted_handlers.swap(next_unsorted_handlers);
-  }
-
-  // If there are any leftover unsorted handlers, they must have had
-  // circular dependencies.
-  CHECK(unsorted_handlers.size() == 0) << "Extension manifest handlers have "
-                                       << "circular dependencies!";
-}
-
-}  // namespace extensions