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// Copyright 2014 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/signaling/iq_sender.h"
#include <memory>
#include <utility>
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/task/single_thread_task_runner.h"
#include "base/time/time.h"
#include "remoting/signaling/signal_strategy.h"
#include "remoting/signaling/signaling_id_util.h"
#include "remoting/signaling/xmpp_constants.h"
#include "third_party/libjingle_xmpp/xmllite/xmlelement.h"
namespace remoting {
// static
std::unique_ptr<jingle_xmpp::XmlElement> IqSender::MakeIqStanza(
const std::string& type,
const std::string& addressee,
std::unique_ptr<jingle_xmpp::XmlElement> iq_body) {
std::unique_ptr<jingle_xmpp::XmlElement> stanza(
new jingle_xmpp::XmlElement(kQNameIq));
stanza->AddAttr(kQNameType, type);
if (!addressee.empty()) {
stanza->AddAttr(kQNameTo, addressee);
}
stanza->AddElement(iq_body.release());
return stanza;
}
IqSender::IqSender(SignalStrategy* signal_strategy)
: signal_strategy_(signal_strategy) {
signal_strategy_->AddListener(this);
}
IqSender::~IqSender() {
signal_strategy_->RemoveListener(this);
}
std::unique_ptr<IqRequest> IqSender::SendIq(
std::unique_ptr<jingle_xmpp::XmlElement> stanza,
ReplyCallback callback) {
std::string addressee = stanza->Attr(kQNameTo);
std::string id = stanza->Attr(kQNameId);
if (id.empty()) {
id = signal_strategy_->GetNextId();
stanza->AddAttr(kQNameId, id);
}
if (!signal_strategy_->SendStanza(std::move(stanza))) {
return nullptr;
}
DCHECK(requests_.find(id) == requests_.end());
bool callback_exists = !callback.is_null();
auto request =
std::make_unique<IqRequest>(this, std::move(callback), addressee);
if (callback_exists) {
requests_[id] = request.get();
}
return request;
}
std::unique_ptr<IqRequest> IqSender::SendIq(
const std::string& type,
const std::string& addressee,
std::unique_ptr<jingle_xmpp::XmlElement> iq_body,
ReplyCallback callback) {
return SendIq(MakeIqStanza(type, addressee, std::move(iq_body)),
std::move(callback));
}
void IqSender::RemoveRequest(IqRequest* request) {
auto it = requests_.begin();
while (it != requests_.end()) {
auto cur = it;
++it;
if (cur->second == request) {
requests_.erase(cur);
break;
}
}
}
void IqSender::OnSignalStrategyStateChange(SignalStrategy::State state) {}
bool IqSender::OnSignalStrategyIncomingStanza(
const jingle_xmpp::XmlElement* stanza) {
if (stanza->Name() != kQNameIq) {
LOG(WARNING) << "Received unexpected non-IQ packet " << stanza->Str();
return false;
}
const std::string& type = stanza->Attr(kQNameType);
if (type.empty()) {
LOG(WARNING) << "IQ packet missing type " << stanza->Str();
return false;
}
if (type != "result" && type != "error") {
return false;
}
const std::string& id = stanza->Attr(kQNameId);
if (id.empty()) {
LOG(WARNING) << "IQ packet missing id " << stanza->Str();
return false;
}
std::string from = stanza->Attr(kQNameFrom);
auto it = requests_.find(id);
if (it == requests_.end()) {
return false;
}
IqRequest* request = it->second;
if (NormalizeSignalingId(request->addressee_) != NormalizeSignalingId(from)) {
LOG(ERROR) << "Received IQ response from an invalid JID. Ignoring it."
<< " Message received from: " << from
<< " Original JID: " << request->addressee_;
return false;
}
requests_.erase(it);
request->OnResponse(stanza);
return true;
}
IqRequest::IqRequest(IqSender* sender,
IqSender::ReplyCallback callback,
const std::string& addressee)
: sender_(sender), callback_(std::move(callback)), addressee_(addressee) {}
IqRequest::~IqRequest() {
sender_->RemoveRequest(this);
}
void IqRequest::SetTimeout(base::TimeDelta timeout) {
base::SingleThreadTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&IqRequest::OnTimeout, weak_factory_.GetWeakPtr()),
timeout);
}
void IqRequest::CallCallback(const jingle_xmpp::XmlElement* stanza) {
if (!callback_.is_null()) {
std::move(callback_).Run(this, stanza);
}
}
void IqRequest::OnTimeout() {
CallCallback(nullptr);
}
void IqRequest::OnResponse(const jingle_xmpp::XmlElement* stanza) {
// It's unsafe to delete signal strategy here, and the callback may
// want to do that, so we post task to invoke the callback later.
std::unique_ptr<jingle_xmpp::XmlElement> stanza_copy(
new jingle_xmpp::XmlElement(*stanza));
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(&IqRequest::DeliverResponse, weak_factory_.GetWeakPtr(),
std::move(stanza_copy)));
}
void IqRequest::DeliverResponse(
std::unique_ptr<jingle_xmpp::XmlElement> stanza) {
CallCallback(stanza.get());
}
} // namespace remoting
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