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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/direct_sockets/tcp_server_socket.h"
#include "base/functional/callback_helpers.h"
#include "base/metrics/histogram_functions.h"
#include "base/notreached.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_tcp_server_socket_open_info.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_tcp_server_socket_options.h"
#include "third_party/blink/renderer/core/streams/readable_stream.h"
#include "third_party/blink/renderer/modules/direct_sockets/tcp_server_readable_stream_wrapper.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
namespace blink {
namespace {
mojom::blink::DirectTCPServerSocketOptionsPtr CreateTCPServerSocketOptions(
const String& local_address,
const TCPServerSocketOptions* options,
ExceptionState& exception_state) {
auto socket_options = mojom::blink::DirectTCPServerSocketOptions::New();
net::IPAddress address;
if (!address.AssignFromIPLiteral(local_address.Utf8())) {
exception_state.ThrowTypeError("localAddress must be a valid IP address.");
return {};
}
if (options->hasLocalPort() && options->localPort() == 0) {
exception_state.ThrowTypeError(
"localPort must be greater than zero. Leave this field unassigned to "
"allow the OS to pick a port on its own.");
return {};
}
// Port 0 allows the OS to pick an available port on its own.
net::IPEndPoint local_addr = net::IPEndPoint(
std::move(address), options->hasLocalPort() ? options->localPort() : 0U);
if (options->hasBacklog()) {
if (options->backlog() == 0) {
exception_state.ThrowTypeError("backlog must be greater than zero.");
return {};
}
socket_options->backlog = options->backlog();
}
if (options->hasIpv6Only()) {
if (local_addr.address() != net::IPAddress::IPv6AllZeros()) {
exception_state.ThrowTypeError(
"ipv6Only can only be specified when localAddress is [::] or "
"equivalent.");
return {};
}
socket_options->ipv6_only = options->ipv6Only();
}
socket_options->local_addr = std::move(local_addr);
return socket_options;
}
} // namespace
TCPServerSocket::TCPServerSocket(ScriptState* script_state)
: Socket(script_state),
opened_(MakeGarbageCollected<
ScriptPromiseProperty<TCPServerSocketOpenInfo, DOMException>>(
GetExecutionContext())) {}
TCPServerSocket::~TCPServerSocket() = default;
// static
TCPServerSocket* TCPServerSocket::Create(ScriptState* script_state,
const String& local_address,
const TCPServerSocketOptions* options,
ExceptionState& exception_state) {
if (!Socket::CheckContextAndPermissions(script_state, exception_state)) {
return nullptr;
}
auto* socket = MakeGarbageCollected<TCPServerSocket>(script_state);
if (!socket->Open(local_address, options, exception_state)) {
return nullptr;
}
return socket;
}
ScriptPromise<TCPServerSocketOpenInfo> TCPServerSocket::opened(
ScriptState* script_state) const {
return opened_->Promise(script_state->World());
}
ScriptPromise<IDLUndefined> TCPServerSocket::close(
ScriptState* script_state,
ExceptionState& exception_state) {
if (GetState() == State::kOpening) {
exception_state.ThrowDOMException(DOMExceptionCode::kInvalidStateError,
"Socket is not properly initialized.");
return EmptyPromise();
}
if (GetState() != State::kOpen) {
return closed(script_state);
}
if (readable_stream_wrapper_->Locked()) {
exception_state.ThrowDOMException(DOMExceptionCode::kInvalidStateError,
"Close called on locked streams.");
return EmptyPromise();
}
auto* reason = MakeGarbageCollected<DOMException>(
DOMExceptionCode::kAbortError, "Stream closed.");
auto readable_cancel = readable_stream_wrapper_->Readable()->cancel(
script_state, ScriptValue::From(script_state, reason), exception_state);
DCHECK(!exception_state.HadException());
readable_cancel.MarkAsHandled();
return closed(script_state);
}
bool TCPServerSocket::Open(const String& local_addr,
const TCPServerSocketOptions* options,
ExceptionState& exception_state) {
auto open_tcp_server_socket_options =
CreateTCPServerSocketOptions(local_addr, options, exception_state);
if (exception_state.HadException()) {
return false;
}
mojo::PendingRemote<network::mojom::blink::TCPServerSocket> tcp_server_remote;
mojo::PendingReceiver<network::mojom::blink::TCPServerSocket>
tcp_server_receiver = tcp_server_remote.InitWithNewPipeAndPassReceiver();
GetServiceRemote()->OpenTCPServerSocket(
std::move(open_tcp_server_socket_options), std::move(tcp_server_receiver),
WTF::BindOnce(&TCPServerSocket::OnTCPServerSocketOpened,
WrapPersistent(this), std::move(tcp_server_remote)));
return true;
}
void TCPServerSocket::OnTCPServerSocketOpened(
mojo::PendingRemote<network::mojom::blink::TCPServerSocket>
tcp_server_remote,
int32_t result,
const std::optional<net::IPEndPoint>& local_addr) {
if (result == net::OK) {
DCHECK(local_addr);
readable_stream_wrapper_ =
MakeGarbageCollected<TCPServerReadableStreamWrapper>(
GetScriptState(),
WTF::BindOnce(&TCPServerSocket::OnReadableStreamClosed,
WrapPersistent(this)),
std::move(tcp_server_remote));
auto* open_info = TCPServerSocketOpenInfo::Create();
open_info->setReadable(readable_stream_wrapper_->Readable());
open_info->setLocalAddress(String{local_addr->ToStringWithoutPort()});
open_info->setLocalPort(local_addr->port());
opened_->Resolve(open_info);
SetState(State::kOpen);
} else {
// Error codes are negative.
base::UmaHistogramSparse("DirectSockets.TCPServerNetworkFailures", -result);
ReleaseResources();
ScriptState::Scope scope(GetScriptState());
auto* exception = CreateDOMExceptionFromNetErrorCode(result);
opened_->Reject(exception);
GetClosedProperty().Reject(ScriptValue(GetScriptState()->GetIsolate(),
exception->ToV8(GetScriptState())));
SetState(State::kAborted);
}
DCHECK_NE(GetState(), State::kOpening);
}
void TCPServerSocket::Trace(Visitor* visitor) const {
visitor->Trace(opened_);
visitor->Trace(readable_stream_wrapper_);
ScriptWrappable::Trace(visitor);
Socket::Trace(visitor);
}
void TCPServerSocket::ContextDestroyed() {
// Release resources as quickly as possible.
ReleaseResources();
}
void TCPServerSocket::ReleaseResources() {
ResetServiceAndFeatureHandle();
readable_stream_wrapper_.Clear();
}
void TCPServerSocket::OnReadableStreamClosed(v8::Local<v8::Value> exception,
int net_error) {
DCHECK_EQ(GetState(), State::kOpen);
if (!exception.IsEmpty()) {
GetClosedProperty().Reject(
ScriptValue(GetScriptState()->GetIsolate(), exception));
SetState(State::kAborted);
} else {
GetClosedProperty().ResolveWithUndefined();
SetState(State::kClosed);
}
ReleaseResources();
DCHECK_NE(GetState(), State::kOpen);
}
} // namespace blink
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