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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/protocol/jingle_session_manager.h"
#include <string>
#include <utility>
#include "base/functional/bind.h"
#include "base/location.h"
#include "remoting/protocol/authenticator.h"
#include "remoting/protocol/content_description.h"
#include "remoting/protocol/jingle_messages.h"
#include "remoting/protocol/jingle_session.h"
#include "remoting/protocol/session_observer.h"
#include "remoting/protocol/transport.h"
#include "remoting/signaling/iq_sender.h"
#include "remoting/signaling/signal_strategy.h"
#include "remoting/signaling/xmpp_constants.h"
#include "third_party/libjingle_xmpp/xmllite/xmlelement.h"
#include "third_party/webrtc/rtc_base/socket_address.h"
using jingle_xmpp::QName;
namespace remoting::protocol {
JingleSessionManager::JingleSessionManager(SignalStrategy* signal_strategy)
: signal_strategy_(signal_strategy),
protocol_config_(CandidateSessionConfig::CreateDefault()),
iq_sender_(new IqSender(signal_strategy_)) {
signal_strategy_->AddListener(this);
}
JingleSessionManager::~JingleSessionManager() {
DCHECK(sessions_.empty());
signal_strategy_->RemoveListener(this);
}
void JingleSessionManager::AcceptIncoming(
const IncomingSessionCallback& incoming_session_callback) {
incoming_session_callback_ = incoming_session_callback;
}
void JingleSessionManager::set_protocol_config(
std::unique_ptr<CandidateSessionConfig> config) {
protocol_config_ = std::move(config);
}
std::unique_ptr<Session> JingleSessionManager::Connect(
const SignalingAddress& peer_address,
std::unique_ptr<Authenticator> authenticator) {
std::unique_ptr<JingleSession> session(new JingleSession(this));
session->StartConnection(peer_address, std::move(authenticator));
sessions_[session->session_id_] = session.get();
return std::move(session);
}
void JingleSessionManager::set_authenticator_factory(
std::unique_ptr<AuthenticatorFactory> authenticator_factory) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
authenticator_factory_ = std::move(authenticator_factory);
}
SessionObserver::Subscription JingleSessionManager::AddSessionObserver(
SessionObserver* observer) {
observers_.AddObserver(observer);
return SessionObserver::Subscription(
base::BindOnce(&JingleSessionManager::RemoveSessionObserver,
weak_factory_.GetWeakPtr(), observer));
}
void JingleSessionManager::RemoveSessionObserver(SessionObserver* observer) {
observers_.RemoveObserver(observer);
}
void JingleSessionManager::OnSignalStrategyStateChange(
SignalStrategy::State state) {}
bool JingleSessionManager::OnSignalStrategyIncomingStanza(
const jingle_xmpp::XmlElement* stanza) {
if (!JingleMessage::IsJingleMessage(stanza)) {
return false;
}
std::unique_ptr<jingle_xmpp::XmlElement> stanza_copy(
new jingle_xmpp::XmlElement(*stanza));
std::unique_ptr<JingleMessage> message(new JingleMessage());
std::string error_msg;
if (!message->ParseXml(stanza, &error_msg)) {
SendReply(std::move(stanza_copy), JingleMessageReply::BAD_REQUEST);
return true;
}
if (message->action == JingleMessage::SESSION_INITIATE) {
// Description must be present in session-initiate messages.
DCHECK(message->description.get());
SendReply(std::move(stanza_copy), JingleMessageReply::NONE);
std::unique_ptr<Authenticator> authenticator =
authenticator_factory_->CreateAuthenticator(
signal_strategy_->GetLocalAddress().id(), message->from.id());
JingleSession* session = new JingleSession(this);
session->InitializeIncomingConnection(stanza->Attr(kQNameId), *message,
std::move(authenticator));
sessions_[session->session_id_] = session;
// Destroy the session if it was rejected due to incompatible protocol.
if (session->state_ != Session::ACCEPTING) {
delete session;
DCHECK(sessions_.find(message->sid) == sessions_.end());
return true;
}
IncomingSessionResponse response = SessionManager::DECLINE;
std::string rejection_reason;
base::Location rejection_location;
if (!incoming_session_callback_.is_null()) {
incoming_session_callback_.Run(session, &response, &rejection_reason,
&rejection_location);
}
if (response == SessionManager::ACCEPT) {
session->AcceptIncomingConnection(*message);
} else {
ErrorCode error;
switch (response) {
case OVERLOAD:
error = ErrorCode::HOST_OVERLOAD;
break;
case DECLINE:
error = ErrorCode::SESSION_REJECTED;
break;
default:
NOTREACHED();
}
session->Close(error, rejection_reason, rejection_location);
delete session;
DCHECK(sessions_.find(message->sid) == sessions_.end());
}
return true;
}
auto it = sessions_.find(message->sid);
if (it == sessions_.end()) {
SendReply(std::move(stanza_copy), JingleMessageReply::INVALID_SID);
return true;
}
it->second->OnIncomingMessage(
stanza->Attr(kQNameId), std::move(message),
base::BindOnce(&JingleSessionManager::SendReply, base::Unretained(this),
std::move(stanza_copy)));
return true;
}
void JingleSessionManager::SendReply(
std::unique_ptr<jingle_xmpp::XmlElement> original_stanza,
JingleMessageReply::ErrorType error) {
signal_strategy_->SendStanza(
JingleMessageReply(error).ToXml(original_stanza.get()));
}
void JingleSessionManager::SessionDestroyed(JingleSession* session) {
sessions_.erase(session->session_id_);
}
} // namespace remoting::protocol
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