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#include <QtCore/QDebug>
#include <QtCore/QUrl>
#include "sappeer.h"
#include "endianhelpers.h"
#include "webproxytrans.h"
#include "webproxyconn.h"
WebProxyConn::WebProxyConn(SAPConnection *conn, QObject *parent)
: QObject(parent), _conn(conn),
_in(conn->getSocket(501)), _out(conn->getSocket(502))
{
connect(_conn, SIGNAL(disconnected()), SLOT(deleteLater()));
connect(_conn, SIGNAL(destroyed()), SLOT(deleteLater()));
Q_ASSERT(_in && _out);
connect(_in, SIGNAL(messageReceived()), SLOT(handleMessageReceived()));
}
WebProxyConn::Message WebProxyConn::unpackMessage(const QByteArray &data)
{
Message msg;
int offset = 0;
msg.command = read<quint8>(data, offset);
msg.subCommand = read<quint8>(data, offset);
msg.type = static_cast<MessageType>(read<quint8>(data, offset));
msg.transactionId = read<quint8>(data, offset);
const quint32 len = read<quint32>(data, offset);
msg.payload = data.mid(offset, len);
return msg;
}
QByteArray WebProxyConn::packMessage(const Message &msg)
{
QByteArray data;
append<quint8>(data, msg.command);
append<quint8>(data, msg.subCommand);
append<quint8>(data, msg.type);
append<quint8>(data, msg.transactionId);
append<quint32>(data, msg.payload.size());
data.append(msg.payload);
return data;
}
WebProxyConn::RequestHeader WebProxyConn::parseRequestHeader(const QByteArray &req)
{
RequestHeader hdr;
int first = req.indexOf('\n');
if (first <= 0) {
qWarning() << "Invalid request header";
return hdr;
}
QStringList reqLine = QString::fromLatin1(req.mid(0, first).trimmed()).split(' ');
QString method = reqLine.at(0);
if (QString::compare(method, "connect", Qt::CaseInsensitive) == 0) {
hdr.connect = true;
QStringList host = reqLine.at(1).split(':');
hdr.host = host.at(0);
hdr.port = host.at(1).toUInt();
} else {
QUrl url(reqLine.at(1));
hdr.connect = false;
hdr.host = url.host(QUrl::EncodeUnicode);
if (QString::compare(url.scheme(), "https", Qt::CaseInsensitive) == 0) {
hdr.port = url.port(443);
} else {
hdr.port = url.port(80);
}
}
return hdr;
}
QByteArray WebProxyConn::removeHeaders(const QByteArray &req)
{
int offset = 0;
int next;
while ((next = req.indexOf('\n', offset)) > 0) {
QByteArray line = req.mid(offset, next - offset).trimmed();
if (line.isEmpty()) {
return req.mid(next + 1);
}
offset = next + 1;
}
return QByteArray();
}
void WebProxyConn::sendMessage(const Message &msg)
{
_out->send(packMessage(msg));
}
void WebProxyConn::handleRequest(const Message &msg)
{
QByteArray payload = msg.payload;
WebProxyTrans *trans = _trans.value(msg.transactionId, 0);
if (!trans) {
RequestHeader hdr = parseRequestHeader(msg.payload);
qDebug() << "Starting transaction" << msg.transactionId << "to" << hdr.host << hdr.port << (hdr.connect ? "tunnel" : "http");
trans = new WebProxyTrans(msg.transactionId, hdr.connect, hdr.host, hdr.port, this);
connect(trans, SIGNAL(dataReceived(QByteArray)), this, SLOT(handleTransDataReceived(QByteArray)));
connect(trans, SIGNAL(disconnected()), this, SLOT(handleTransDisconnected()));
// Discard request body, but if it was a CONNECT request.
if (hdr.connect) {
payload = removeHeaders(payload);
}
_trans.insert(msg.transactionId, trans);
}
if (!payload.isEmpty()) {
trans->write(payload);
}
}
void WebProxyConn::handleAbort(const Message &msg)
{
qDebug() << "Abort transaction" << msg.transactionId;
WebProxyTrans *trans = _trans.value(msg.transactionId, 0);
if (trans) {
delete trans;
_trans.remove(msg.transactionId);
} else {
qWarning() << "Transaction" << msg.transactionId << "does not exist";
}
}
void WebProxyConn::handleMessageReceived()
{
QByteArray data = _in->receive();
Message msg = unpackMessage(data);
if (msg.command != 1 || msg.subCommand != 1) {
qWarning() << "Invalid command/subcommand: " << msg.command << "/" << msg.subCommand;
return;
}
switch (msg.type) {
case MessageRequest:
handleRequest(msg);
break;
case MessageAbort:
handleAbort(msg);
break;
default:
qWarning() << "Unknown request type" << msg.type;
}
}
void WebProxyConn::handleTransDataReceived(const QByteArray &data)
{
WebProxyTrans *trans = static_cast<WebProxyTrans*>(sender());
Message msg;
msg.command = 1;
msg.subCommand = 1;
msg.type = MessageResponse;
msg.transactionId = trans->transactionId();
msg.payload = data;
sendMessage(msg);
}
void WebProxyConn::handleTransDisconnected()
{
WebProxyTrans *trans = static_cast<WebProxyTrans*>(sender());
Message msg;
msg.command = 1;
msg.subCommand = 1;
msg.type = MessageAbort;
msg.transactionId = trans->transactionId();
msg.payload.clear(); // Empty payload signals disconnection
qDebug() << "Sending disconnected event";
sendMessage(msg);
_trans.remove(msg.transactionId);
trans->deleteLater();
}
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