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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "bencodeparser.h"
#include "connectionmanager.h"
#include "torrentclient.h"
#include "torrentserver.h"
#include "trackerclient.h"
#include <QtCore>
#include <QNetworkRequest>
TrackerClient::TrackerClient(TorrentClient *downloader, QObject *parent)
: QObject(parent), torrentDownloader(downloader)
{
connect(&http, &QNetworkAccessManager::finished,
this, &TrackerClient::httpRequestDone);
}
void TrackerClient::start(const MetaInfo &info)
{
metaInfo = info;
QTimer::singleShot(0, this, &TrackerClient::fetchPeerList);
if (metaInfo.fileForm() == MetaInfo::SingleFileForm) {
length = metaInfo.singleFile().length;
} else {
QList<MetaInfoMultiFile> files = metaInfo.multiFiles();
for (int i = 0; i < files.size(); ++i)
length += files.at(i).length;
}
}
void TrackerClient::startSeeding()
{
firstSeeding = true;
fetchPeerList();
}
void TrackerClient::stop()
{
lastTrackerRequest = true;
fetchPeerList();
}
void TrackerClient::timerEvent(QTimerEvent *event)
{
if (event->timerId() == requestIntervalTimer) {
fetchPeerList();
} else {
QObject::timerEvent(event);
}
}
void TrackerClient::fetchPeerList()
{
if (metaInfo.announceUrl().isEmpty())
return;
QUrl url(metaInfo.announceUrl());
// Base the query on announce url to include a passkey (if any)
QUrlQuery query(url);
// Percent encode the hash
const QByteArray infoHash = torrentDownloader->infoHash();
const QByteArray encodedSum = infoHash.toPercentEncoding();
bool seeding = (torrentDownloader->state() == TorrentClient::Seeding);
query.addQueryItem("info_hash", encodedSum);
query.addQueryItem("peer_id", ConnectionManager::instance()->clientId());
query.addQueryItem("port", QByteArray::number(TorrentServer::instance()->serverPort()));
query.addQueryItem("compact", "1");
query.addQueryItem("uploaded", QByteArray::number(torrentDownloader->uploadedBytes()));
if (!firstSeeding) {
query.addQueryItem("downloaded", "0");
query.addQueryItem("left", "0");
} else {
query.addQueryItem("downloaded",
QByteArray::number(torrentDownloader->downloadedBytes()));
int left = qMax<int>(0, metaInfo.totalSize() - torrentDownloader->downloadedBytes());
query.addQueryItem("left", QByteArray::number(seeding ? 0 : left));
}
if (seeding && firstSeeding) {
query.addQueryItem("event", "completed");
firstSeeding = false;
} else if (firstTrackerRequest) {
firstTrackerRequest = false;
query.addQueryItem("event", "started");
} else if(lastTrackerRequest) {
query.addQueryItem("event", "stopped");
}
if (!trackerId.isEmpty())
query.addQueryItem("trackerid", trackerId);
url.setQuery(query);
QNetworkRequest req(url);
if (!url.userName().isEmpty()) {
uname = url.userName();
pwd = url.password();
connect(&http, &QNetworkAccessManager::authenticationRequired,
this, &TrackerClient::provideAuthentication);
}
http.get(req);
}
void TrackerClient::httpRequestDone(QNetworkReply *reply)
{
reply->deleteLater();
if (lastTrackerRequest) {
emit stopped();
return;
}
if (reply->error() != QNetworkReply::NoError) {
emit connectionError(reply->error());
return;
}
QByteArray response = reply->readAll();
reply->abort();
BencodeParser parser;
if (!parser.parse(response)) {
qWarning("Error parsing bencode response from tracker: %s",
qPrintable(parser.errorString()));
return;
}
QMap<QByteArray, QVariant> dict = parser.dictionary();
if (dict.contains("failure reason")) {
// no other items are present
emit failure(QString::fromUtf8(dict.value("failure reason").toByteArray()));
return;
}
if (dict.contains("warning message")) {
// continue processing
emit warning(QString::fromUtf8(dict.value("warning message").toByteArray()));
}
if (dict.contains("tracker id")) {
// store it
trackerId = dict.value("tracker id").toByteArray();
}
if (dict.contains("interval")) {
// Mandatory item
if (requestIntervalTimer != -1)
killTimer(requestIntervalTimer);
requestIntervalTimer = startTimer(std::chrono::seconds(dict.value("interval").toInt()));
}
if (dict.contains("peers")) {
// store it
peers.clear();
QVariant peerEntry = dict.value("peers");
if (peerEntry.userType() == QMetaType::QVariantList) {
QList<QVariant> peerTmp = peerEntry.toList();
for (int i = 0; i < peerTmp.size(); ++i) {
TorrentPeer tmp;
QMap<QByteArray, QVariant> peer = qvariant_cast<QMap<QByteArray, QVariant> >(peerTmp.at(i));
tmp.id = QString::fromUtf8(peer.value("peer id").toByteArray());
tmp.address.setAddress(QString::fromUtf8(peer.value("ip").toByteArray()));
tmp.port = peer.value("port").toInt();
peers << tmp;
}
} else {
QByteArray peerTmp = peerEntry.toByteArray();
for (int i = 0; i < peerTmp.size(); i += 6) {
TorrentPeer tmp;
uchar *data = (uchar *)peerTmp.constData() + i;
tmp.port = (int(data[4]) << 8) + data[5];
uint ipAddress = 0;
ipAddress += uint(data[0]) << 24;
ipAddress += uint(data[1]) << 16;
ipAddress += uint(data[2]) << 8;
ipAddress += uint(data[3]);
tmp.address.setAddress(ipAddress);
peers << tmp;
}
}
emit peerListUpdated(peers);
}
}
void TrackerClient::provideAuthentication(QNetworkReply *reply, QAuthenticator *auth)
{
Q_UNUSED(reply);
auth->setUser(uname);
auth->setPassword(pwd);
}
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