Revert of Introduce HostID and de-couple Extensions from "script injection System" [browser side]

chrome/browser/extensions/extension_user_script_loader.cc

-// Copyright 2015 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/extension_user_script_loader.h"
-
-#include <set>
-#include <string>
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/files/file_path.h"
-#include "base/files/file_util.h"
-#include "base/version.h"
-#include "chrome/browser/profiles/profile.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/notification_service.h"
-#include "content/public/browser/render_process_host.h"
-#include "extensions/browser/component_extension_resource_manager.h"
-#include "extensions/browser/content_verifier.h"
-#include "extensions/browser/extension_registry.h"
-#include "extensions/browser/extension_system.h"
-#include "extensions/browser/extensions_browser_client.h"
-#include "extensions/common/file_util.h"
-#include "extensions/common/manifest_handlers/default_locale_handler.h"
-#include "extensions/common/message_bundle.h"
-#include "extensions/common/one_shot_event.h"
-#include "ui/base/resource/resource_bundle.h"
-
-namespace extensions {
-
-namespace {
-
-// Verifies file contents as they are read.
-void VerifyContent(const scoped_refptr<ContentVerifier>& verifier,
-                   const std::string& extension_id,
-                   const base::FilePath& extension_root,
-                   const base::FilePath& relative_path,
-                   const std::string& content) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
-  scoped_refptr<ContentVerifyJob> job(
-      verifier->CreateJobFor(extension_id, extension_root, relative_path));
-  if (job.get()) {
-    job->Start();
-    job->BytesRead(content.size(), content.data());
-    job->DoneReading();
-  }
-}
-
-// Loads user scripts from the extension who owns these scripts.
-bool ExtensionLoadScriptContent(
-    const HostID& host_id,
-    UserScript::File* script_file,
-    const UserScriptLoader::SubstitutionMap* localization_messages,
-    const scoped_refptr<ContentVerifier>& verifier) {
-  DCHECK(script_file);
-  std::string content;
-  const base::FilePath& path = ExtensionResource::GetFilePath(
-      script_file->extension_root(), script_file->relative_path(),
-      ExtensionResource::SYMLINKS_MUST_RESOLVE_WITHIN_ROOT);
-  if (path.empty()) {
-    int resource_id = 0;
-    if (ExtensionsBrowserClient::Get()
-            ->GetComponentExtensionResourceManager()
-            ->IsComponentExtensionResource(script_file->extension_root(),
-                                           script_file->relative_path(),
-                                           &resource_id)) {
-      const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
-      content = rb.GetRawDataResource(resource_id).as_string();
-    } else {
-      LOG(WARNING) << "Failed to get file path to "
-                   << script_file->relative_path().value() << " from "
-                   << script_file->extension_root().value();
-      return false;
-    }
-  } else {
-    if (!base::ReadFileToString(path, &content)) {
-      LOG(WARNING) << "Failed to load user script file: " << path.value();
-      return false;
-    }
-    if (verifier.get()) {
-      content::BrowserThread::PostTask(
-          content::BrowserThread::IO, FROM_HERE,
-          base::Bind(&VerifyContent, verifier, host_id.id(),
-                     script_file->extension_root(),
-                     script_file->relative_path(), content));
-    }
-  }
-
-  // Localize the content.
-  if (localization_messages) {
-    std::string error;
-    MessageBundle::ReplaceMessagesWithExternalDictionary(*localization_messages,
-                                                         &content, &error);
-    if (!error.empty())
-      LOG(WARNING) << "Failed to replace messages in script: " << error;
-  }
-
-  // Remove BOM from the content.
-  std::string::size_type index = content.find(base::kUtf8ByteOrderMark);
-  if (index == 0)
-    script_file->set_content(content.substr(strlen(base::kUtf8ByteOrderMark)));
-  else
-    script_file->set_content(content);
-
-  return true;
-}
-
-}  // namespace
-
-ExtensionUserScriptLoader::ExtensionUserScriptLoader(
-    Profile* profile,
-    const HostID& host_id,
-    bool listen_for_extension_system_loaded)
-    : UserScriptLoader(profile,
-                       host_id,
-                       ExtensionSystem::Get(profile)->content_verifier()),
-      extension_registry_observer_(this),
-      weak_factory_(this) {
-  extension_registry_observer_.Add(ExtensionRegistry::Get(profile));
-  if (listen_for_extension_system_loaded) {
-    ExtensionSystem::Get(profile)->ready().Post(
-        FROM_HERE,
-        base::Bind(&ExtensionUserScriptLoader::OnExtensionSystemReady,
-                   weak_factory_.GetWeakPtr()));
-  } else {
-    SetReady(true);
-  }
-}
-
-ExtensionUserScriptLoader::~ExtensionUserScriptLoader() {
-}
-
-void ExtensionUserScriptLoader::UpdateHostsInfo(
-    const std::set<HostID>& changed_hosts) {
-  ExtensionRegistry* registry = ExtensionRegistry::Get(profile());
-  for (const HostID& host_id : changed_hosts) {
-    const Extension* extension =
-        registry->GetExtensionById(host_id.id(), ExtensionRegistry::ENABLED);
-    // |changed_hosts_| may include hosts that have been removed,
-    // which leads to the above lookup failing. In this case, just continue.
-    if (!extension)
-      continue;
-    AddHostInfo(host_id, ExtensionSet::ExtensionPathAndDefaultLocale(
-                             extension->path(),
-                             LocaleInfo::GetDefaultLocale(extension)));
-  }
-}
-
-UserScriptLoader::LoadUserScriptsContentFunction
-ExtensionUserScriptLoader::GetLoadUserScriptsFunction() {
-  return base::Bind(&ExtensionLoadScriptContent);
-}
-
-void ExtensionUserScriptLoader::OnExtensionUnloaded(
-    content::BrowserContext* browser_context,
-    const Extension* extension,
-    UnloadedExtensionInfo::Reason reason) {
-  RemoveHostInfo(HostID(HostID::EXTENSIONS, extension->id()));
-}
-
-void ExtensionUserScriptLoader::OnExtensionSystemReady() {
-  SetReady(true);
-}
-
-}  // namespace extensions