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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.
#include "chrome/browser/extensions/api/web_authentication_proxy/remote_session_state_change.h"
#include <memory>
#include "base/base_paths.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/task/bind_post_task.h"
#include "base/task/sequenced_task_runner.h"
#include "chrome/common/chrome_paths_internal.h"
#include "chrome/common/extensions/api/web_authentication_proxy.h"
namespace extensions {
namespace {
void OnSessionStateChangeFileUpdate(
const base::FilePath& watched_path,
const base::RepeatingCallback<void()>& update_callback,
const base::FilePath& path,
bool is_error) {
DCHECK_EQ(path, watched_path);
if (is_error) {
DLOG(ERROR) << "OnRemoteSessionStateFileUpdate() error";
return;
}
update_callback.Run();
}
void WatchSessionStateChangeFile(
base::FilePathWatcher* watcher,
const ExtensionId& extension_id,
base::RepeatingCallback<void()> update_callback) {
base::FilePath dir;
if (!WebAuthenticationProxyRemoteSessionStateChangeNotifier::
GetSessionStateChangeDir(&dir)) {
DLOG(ERROR) << "GetSessionStateChangeDir failed";
return;
}
if (!base::PathExists(dir)) {
base::CreateDirectory(dir);
}
const base::FilePath path = dir.AppendASCII(extension_id);
if (!watcher->Watch(path, base::FilePathWatcher::Type::kNonRecursive,
base::BindRepeating(&OnSessionStateChangeFileUpdate, path,
update_callback))) {
DLOG(ERROR) << "FilePathWatcher::Watch() failed";
}
DVLOG(1) << "WebAuthenticationProxyRemoteSessionStateChangeNotifier at "
<< path;
}
} // namespace
bool WebAuthenticationProxyRemoteSessionStateChangeNotifier::
GetSessionStateChangeDir(base::FilePath* out) {
// The path must be stable, i.e. the remote desktop app should not need to do
// any sort of discovery, which rules out the User Data Directory. It also has
// to be user-writable, because the app isn't expected to run as root.
base::FilePath default_udd;
if (!chrome::GetDefaultUserDataDirectory(&default_udd)) {
return false;
}
*out = default_udd.Append(
FILE_PATH_LITERAL("WebAuthenticationProxyRemoteSessionStateChange"));
return true;
}
WebAuthenticationProxyRemoteSessionStateChangeNotifier::
WebAuthenticationProxyRemoteSessionStateChangeNotifier(
EventRouter* event_router,
ExtensionId extension_id)
: event_router_(event_router), extension_id_(std::move(extension_id)) {
DCHECK(event_router_);
auto broadcast_event_on_change =
base::BindPostTaskToCurrentDefault(base::BindRepeating(
&WebAuthenticationProxyRemoteSessionStateChangeNotifier::
BroadcastRemoteSessionStateChangeEvent,
weak_ptr_factory_.GetWeakPtr()));
// This task could run after `this` has been deleted. But `watcher_` is
// getting destroyed on `io_runner_`, so it will still be alive.
io_runner_->PostTask(
FROM_HERE,
base::BindOnce(&WatchSessionStateChangeFile, watcher_.get(),
extension_id_, std::move(broadcast_event_on_change)));
}
WebAuthenticationProxyRemoteSessionStateChangeNotifier::
~WebAuthenticationProxyRemoteSessionStateChangeNotifier() = default;
void WebAuthenticationProxyRemoteSessionStateChangeNotifier::
BroadcastRemoteSessionStateChangeEvent() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
event_router_->DispatchEventToExtension(
extension_id_,
std::make_unique<Event>(
events::WEB_AUTHENTICATION_PROXY_ON_REMOTE_SESSION_STATE_CHANGE,
api::web_authentication_proxy::OnRemoteSessionStateChange::kEventName,
api::web_authentication_proxy::OnRemoteSessionStateChange::Create()));
}
} // namespace extensions
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