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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/dbus/arc/arc_appfuse_provider_client.h"
#include <utility>
#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/memory/raw_ptr.h"
#include "chromeos/ash/components/dbus/arc/fake_arc_appfuse_provider_client.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_proxy.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace ash {
namespace {
ArcAppfuseProviderClient* g_instance = nullptr;
class ArcAppfuseProviderClientImpl : public ArcAppfuseProviderClient {
public:
ArcAppfuseProviderClientImpl() = default;
ArcAppfuseProviderClientImpl(const ArcAppfuseProviderClientImpl&) = delete;
ArcAppfuseProviderClientImpl& operator=(const ArcAppfuseProviderClientImpl&) =
delete;
~ArcAppfuseProviderClientImpl() override = default;
// ArcAppfuseProviderClient override:
void Mount(uint32_t uid,
int32_t mount_id,
chromeos::DBusMethodCallback<base::ScopedFD> callback) override {
dbus::MethodCall method_call(arc::appfuse::kArcAppfuseProviderInterface,
arc::appfuse::kMountMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendUint32(uid);
writer.AppendInt32(mount_id);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&ArcAppfuseProviderClientImpl::OnFDMethod,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void Unmount(uint32_t uid,
int32_t mount_id,
chromeos::VoidDBusMethodCallback callback) override {
dbus::MethodCall method_call(arc::appfuse::kArcAppfuseProviderInterface,
arc::appfuse::kUnmountMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendUint32(uid);
writer.AppendInt32(mount_id);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&ArcAppfuseProviderClientImpl::OnVoidDBusMethod,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void OpenFile(
uint32_t uid,
int32_t mount_id,
int32_t file_id,
int32_t flags,
chromeos::DBusMethodCallback<base::ScopedFD> callback) override {
dbus::MethodCall method_call(arc::appfuse::kArcAppfuseProviderInterface,
arc::appfuse::kOpenFileMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendUint32(uid);
writer.AppendInt32(mount_id);
writer.AppendInt32(file_id);
writer.AppendInt32(flags);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&ArcAppfuseProviderClientImpl::OnFDMethod,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
// chromeos::DBusClient override.
void Init(dbus::Bus* bus) override {
proxy_ = bus->GetObjectProxy(
arc::appfuse::kArcAppfuseProviderServiceName,
dbus::ObjectPath(arc::appfuse::kArcAppfuseProviderServicePath));
}
private:
// Runs the callback with the method call result.
void OnVoidDBusMethod(chromeos::VoidDBusMethodCallback callback,
dbus::Response* response) {
std::move(callback).Run(response != nullptr);
}
void OnFDMethod(chromeos::DBusMethodCallback<base::ScopedFD> callback,
dbus::Response* response) {
if (!response) {
std::move(callback).Run(std::nullopt);
return;
}
dbus::MessageReader reader(response);
base::ScopedFD fd;
if (!reader.PopFileDescriptor(&fd)) {
LOG(ERROR) << "Failed to pop FD.";
std::move(callback).Run(std::nullopt);
return;
}
std::move(callback).Run(std::move(fd));
}
raw_ptr<dbus::ObjectProxy> proxy_ = nullptr;
base::WeakPtrFactory<ArcAppfuseProviderClientImpl> weak_ptr_factory_{this};
};
} // namespace
// static
ArcAppfuseProviderClient* ArcAppfuseProviderClient::Get() {
return g_instance;
}
// static
void ArcAppfuseProviderClient::Initialize(dbus::Bus* bus) {
CHECK(bus);
(new ArcAppfuseProviderClientImpl())->Init(bus);
}
// static
void ArcAppfuseProviderClient::InitializeFake() {
new FakeArcAppfuseProviderClient();
}
// static
void ArcAppfuseProviderClient::Shutdown() {
CHECK(g_instance);
delete g_instance;
}
ArcAppfuseProviderClient::ArcAppfuseProviderClient() {
CHECK(!g_instance);
g_instance = this;
}
ArcAppfuseProviderClient::~ArcAppfuseProviderClient() {
CHECK_EQ(g_instance, this);
g_instance = nullptr;
}
} // namespace ash
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