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// 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 "extensions/browser/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 "content/public/browser/browser_context.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"
using content::BrowserContext;
namespace extensions {
namespace {
using SubstitutionMap = std::map<std::string, std::string>;
// 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 LoadScriptContent(const HostID& host_id,
UserScript::File* script_file,
const 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;
}
SubstitutionMap* GetLocalizationMessages(
const ExtensionUserScriptLoader::HostsInfo& hosts_info,
const HostID& host_id) {
ExtensionUserScriptLoader::HostsInfo::const_iterator iter =
hosts_info.find(host_id);
if (iter == hosts_info.end())
return nullptr;
return file_util::LoadMessageBundleSubstitutionMap(
iter->second.first, host_id.id(), iter->second.second);
}
void LoadUserScripts(UserScriptList* user_scripts,
const ExtensionUserScriptLoader::HostsInfo& hosts_info,
const std::set<int>& added_script_ids,
const scoped_refptr<ContentVerifier>& verifier) {
for (UserScript& script : *user_scripts) {
if (added_script_ids.count(script.id()) == 0)
continue;
scoped_ptr<SubstitutionMap> localization_messages(
GetLocalizationMessages(hosts_info, script.host_id()));
for (UserScript::File& script_file : script.js_scripts()) {
if (script_file.GetContent().empty())
LoadScriptContent(script.host_id(), &script_file, nullptr, verifier);
}
for (UserScript::File& script_file : script.css_scripts()) {
if (script_file.GetContent().empty())
LoadScriptContent(script.host_id(), &script_file,
localization_messages.get(), verifier);
}
}
}
void LoadScriptsOnFileThread(
scoped_ptr<UserScriptList> user_scripts,
const ExtensionUserScriptLoader::HostsInfo& hosts_info,
const std::set<int>& added_script_ids,
const scoped_refptr<ContentVerifier>& verifier,
UserScriptLoader::LoadScriptsCallback callback) {
DCHECK(user_scripts.get());
LoadUserScripts(user_scripts.get(), hosts_info, added_script_ids, verifier);
scoped_ptr<base::SharedMemory> memory =
UserScriptLoader::Serialize(*user_scripts);
content::BrowserThread::PostTask(
content::BrowserThread::UI, FROM_HERE,
base::Bind(callback, base::Passed(&user_scripts), base::Passed(&memory)));
}
} // namespace
ExtensionUserScriptLoader::ExtensionUserScriptLoader(
BrowserContext* browser_context,
const HostID& host_id,
bool listen_for_extension_system_loaded)
: UserScriptLoader(browser_context, host_id),
content_verifier_(
ExtensionSystem::Get(browser_context)->content_verifier()),
extension_registry_observer_(this),
weak_factory_(this) {
extension_registry_observer_.Add(ExtensionRegistry::Get(browser_context));
if (listen_for_extension_system_loaded) {
ExtensionSystem::Get(browser_context)
->ready()
.Post(FROM_HERE,
base::Bind(&ExtensionUserScriptLoader::OnExtensionSystemReady,
weak_factory_.GetWeakPtr()));
} else {
SetReady(true);
}
}
ExtensionUserScriptLoader::~ExtensionUserScriptLoader() {
}
void ExtensionUserScriptLoader::LoadScriptsForTest(
UserScriptList* user_scripts) {
HostsInfo info;
std::set<int> added_script_ids;
for (UserScript& script : *user_scripts)
added_script_ids.insert(script.id());
LoadUserScripts(user_scripts, info, added_script_ids,
nullptr /* no verifier for testing */);
}
void ExtensionUserScriptLoader::LoadScripts(
scoped_ptr<UserScriptList> user_scripts,
const std::set<HostID>& changed_hosts,
const std::set<int>& added_script_ids,
LoadScriptsCallback callback) {
UpdateHostsInfo(changed_hosts);
content::BrowserThread::PostTask(
content::BrowserThread::FILE, FROM_HERE,
base::Bind(&LoadScriptsOnFileThread, base::Passed(&user_scripts),
hosts_info_, added_script_ids, content_verifier_, callback));
}
void ExtensionUserScriptLoader::UpdateHostsInfo(
const std::set<HostID>& changed_hosts) {
ExtensionRegistry* registry = ExtensionRegistry::Get(browser_context());
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;
if (hosts_info_.find(host_id) != hosts_info_.end())
continue;
hosts_info_[host_id] = ExtensionSet::ExtensionPathAndDefaultLocale(
extension->path(), LocaleInfo::GetDefaultLocale(extension));
}
}
void ExtensionUserScriptLoader::OnExtensionUnloaded(
content::BrowserContext* browser_context,
const Extension* extension,
UnloadedExtensionInfo::Reason reason) {
hosts_info_.erase(HostID(HostID::EXTENSIONS, extension->id()));
}
void ExtensionUserScriptLoader::OnExtensionSystemReady() {
SetReady(true);
}
} // namespace extensions
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