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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_EXTENSIONS_API_WEB_AUTHENTICATION_PROXY_REMOTE_SESSION_STATE_CHANGE_H_
#define CHROME_BROWSER_EXTENSIONS_API_WEB_AUTHENTICATION_PROXY_REMOTE_SESSION_STATE_CHANGE_H_
#include <memory>
#include "base/files/file_path.h"
#include "base/files/file_path_watcher.h"
#include "base/functional/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "extensions/browser/event_router.h"
namespace extensions {
// WebAuthenticationProxyRemoteSessionStateChangeNotifier watches for changes to
// a per-extension file in the well-known directory path returned by
// `GetSessionStateChangeDir()`, and raises
// `webAuthentcationProxy.onRemoteSessionStateChange` events in response.
class WebAuthenticationProxyRemoteSessionStateChangeNotifier {
public:
// Returns the directory in which the extension is expected to write its file.
static bool GetSessionStateChangeDir(base::FilePath* out);
WebAuthenticationProxyRemoteSessionStateChangeNotifier(
EventRouter* event_router,
ExtensionId extension_id);
WebAuthenticationProxyRemoteSessionStateChangeNotifier(
const WebAuthenticationProxyRemoteSessionStateChangeNotifier&) = delete;
WebAuthenticationProxyRemoteSessionStateChangeNotifier& operator=(
WebAuthenticationProxyRemoteSessionStateChangeNotifier&) = delete;
virtual ~WebAuthenticationProxyRemoteSessionStateChangeNotifier();
private:
void OnRemoteSessionStateFileUpdate(
base::RepeatingCallback<void()> on_file_change,
const base::FilePath& path,
bool error);
void BroadcastRemoteSessionStateChangeEvent();
const raw_ptr<EventRouter> event_router_;
const ExtensionId extension_id_;
// FilePathWatcher::Watch() may block, and must be called on the same sequence
// as the destructor.
scoped_refptr<base::SequencedTaskRunner> io_runner_ =
base::ThreadPool::CreateSequencedTaskRunner({base::MayBlock()});
std::unique_ptr<base::FilePathWatcher, base::OnTaskRunnerDeleter> watcher_{
new base::FilePathWatcher(), base::OnTaskRunnerDeleter(io_runner_)};
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<WebAuthenticationProxyRemoteSessionStateChangeNotifier>
weak_ptr_factory_{this};
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_WEB_AUTHENTICATION_PROXY_REMOTE_SESSION_STATE_CHANGE_H_
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