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Copy pathproxyconnection.cpp
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313 lines (279 loc) · 9.85 KB
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/**
* QPSNProxy is an open source software for downloading PSN packages
* on a PC, then transfer them to a game console via a HTTP proxy.
*
* Copyright (C) 2014 codestation
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "proxyconnection.h"
#include "downloaditem.h"
#include <QDir>
#include <QFileInfo>
#include <QStandardPaths>
static const QStringList methods = QStringList() << "GET" << "POST" << "HEAD" << "PUT" << "DELETE" << "TRACE" << "OPTIONS";
ProxyConnection::ProxyConnection(QObject *parent) :
QTcpSocket(parent), m_notifier(NULL), m_target(NULL), m_file(NULL), m_end_range(-1)
{
}
/**
* @brief ProxyConnection::readProxyClient
* Called when new data is available on the proxy to read
*/
void ProxyConnection::readProxyClient()
{
QTcpSocket* socket = reinterpret_cast<QTcpSocket *>(sender());
// send data to real server if there is a connection in place
if(m_target != NULL)
{
m_target->write(socket->readAll());
return;
}
// read header from the proxy client is at least a line is available
if(socket->canReadLine())
{
// read the first line and split it into method/path/protocol
QStringList tokens = QString(socket->readLine()).split(QRegExp("[ \r\n][ \r\n]*"));
// read the rest of the headers
QString headers = socket->readAll();
// probably an HTTPS connection
if(tokens[0] == QLatin1String("CONNECT"))
{
qDebug("CONNECT %s %s", qPrintable(tokens[1]), qPrintable(tokens[2]));
// connect to remote server, path is host:port
if(connectTarget(tokens[1]))
{
QTextStream os(socket);
os.setAutoDetectUnicode(true);
// send OK to proxy client
os << "HTTP/1.1 200 Connection established\r\n"
"Proxy-agent: QPSNProxy/0.1\r\n"
"\r\n";
// connect slots to read and delete the sockets
connect(m_target, SIGNAL(readyRead()), this, SLOT(receiveData()));
connect(m_target, SIGNAL(disconnected()), this, SLOT(closeConnections()));
}
else
{
// connect failed, close the socket and delete it if is disconnected
socket->close();
if (socket->state() == QTcpSocket::UnconnectedState)
delete socket;
}
}
// HTTP method is GET, POST, etc
else if(methods.contains(tokens[0]))
{
qDebug("%s %s %s", qPrintable(tokens[0]), qPrintable(tokens[1]), qPrintable(tokens[2]));
// extract the host from the path
QString host = tokens[1].mid(7);
int pos = host.indexOf(QChar('/'));
QString path = host.mid(pos);
host = host.left(pos);
//connect to remote server, using extracted host
if(connectTarget(host))
{
QTextStream os(m_target);
os.setAutoDetectUnicode(true);
// send the original method/path/protocol to remote server
os << tokens[0] << " " << path << " " << tokens[2] << "\r\n" << headers;
// check if the requested file exist on disk
if(tokens[0] == "GET")
{
QStringList header_list = headers.split(QRegExp("[\r\n]"));
qint64 start_range = 0;
foreach(const QString &header, header_list)
{
if(header.startsWith("Range: "))
{
QRegExp valid_input("Range: bytes=(\\d+)-(\\d*)");
if(valid_input.indexIn(header) != -1)
{
start_range = valid_input.cap(1).toLongLong();
m_end_range = valid_input.cap(2).toLongLong();
if(m_end_range == 0)
m_end_range = -1;
}
}
}
if(fileExists(path, start_range))
{
qDebug() << "Package found in cache";
connect(m_target, SIGNAL(readyRead()), this, SLOT(prepareFileTransfer()));
}
else
{
qDebug() << "Package not found in cache";
connect(m_target, SIGNAL(readyRead()), this, SLOT(receiveData()));
}
}
else
{
connect(m_target, SIGNAL(readyRead()), this, SLOT(receiveData()));
}
// delete the remote socket on disconnection
connect(m_target, SIGNAL(disconnected()), m_target, SLOT(deleteLater()));
}
else
{
// connect failed, close the socket and delete it if is disconnected
socket->close();
if (socket->state() == QTcpSocket::UnconnectedState)
delete socket;
}
}
}
}
void ProxyConnection::closeConnections()
{
m_target->close();
m_target->deleteLater();
close();
}
/**
* @brief ProxyConnection::prepareFileTransfer
* read the original request from the proxy client and use a local file
* for the response
*/
void ProxyConnection::prepareFileTransfer()
{
QTcpSocket* socket = reinterpret_cast<QTcpSocket *>(sender());
// read header from the proxy client is at least a line is available
while(socket->canReadLine())
{
// read a line from the header
QString header = QString(socket->readLine());
// if the content length is read then change it with the size of the local file
if(header.startsWith("Content-Length: ", Qt::CaseInsensitive))
{
QString newsize(QString("Content-length: %1\r\n").arg(m_file->size()));
write(newsize.toLocal8Bit());
}
else
{
// send the header to the proxy client
write(header.toLocal8Bit());
}
// check if the line is the end of the header
if(header == "\r\n")
{
socket->close();
m_notifier = new QSocketNotifier(m_file->handle(), QSocketNotifier::Read);
connect(m_notifier, SIGNAL(activated(int)), this, SLOT(fileReadyRead(int)));
connect(this, SIGNAL(bytesWritten(qint64)), this, SLOT(continueTransfer(qint64)));
connect(this, SIGNAL(disconnected()), this, SLOT(closeFileConnection()));
break;
}
}
}
void ProxyConnection::continueTransfer(qint64)
{
m_notifier->setEnabled(true);
}
/**
* @brief ProxyConnection::fileReadyRead
* the file is ready to be read
* @param socket identifier
*/
void ProxyConnection::fileReadyRead(int)
{
char buffer[2 * 1024];
QSocketNotifier* notifier = reinterpret_cast<QSocketNotifier *>(sender());
int read_size;
if(m_end_range != -1 && m_file->pos() + static_cast<int>(sizeof(buffer)) > m_end_range)
read_size = m_end_range - m_file->pos();
else
read_size = sizeof(buffer);
int read = m_file->read(buffer, read_size);
if(read > 0 && read_size == sizeof(buffer) && isValid())
write(buffer, read);
else
{
m_file->close();
delete m_file;
m_file = NULL;
close();
}
notifier->setEnabled(false);
}
void ProxyConnection::closeFileConnection()
{
if(m_file !=NULL)
{
m_file->close();
delete m_file;
m_file = NULL;
m_notifier->setEnabled(false);
m_notifier->deleteLater();
close();
}
}
/**
* @brief ProxyConnection::fileExists
* Check if the file exists, then leaves it open
* @param path URL path of the file
* @return true of the file was opened, false otherwise
*/
bool ProxyConnection::fileExists(const QString &path, qint64 start_range)
{
QString data_path = DownloadItem::getPackageDir();
QFileInfo info(QUrl(path).path());
QFileInfo fileinfo(data_path + QDir::separator() + info.fileName());
if(fileinfo.exists())
{
m_file = new QFile(fileinfo.absoluteFilePath());
if(!m_file->open(QIODevice::ReadOnly))
{
delete m_file;
return false;
}
m_file->seek(start_range);
return true;
}
return false;
}
/**
* @brief ProxyConnection::receiveData
* read the data from the remote server, write it on the proxy client socket
*/
void ProxyConnection::receiveData()
{
QTcpSocket* socket = reinterpret_cast<QTcpSocket*>(sender());
write(socket->readAll());
}
/**
* @brief ProxyConnection::connectTarget
* connect to the remote server
* @param host hostname to connect
* @return true if the connection was successful, false otherwise
*/
bool ProxyConnection::connectTarget(const QString &host)
{
QString address;
qint16 port;
int pos = host.indexOf(QChar(':'));
if(pos != -1)
{
address = host.left(pos);
port = host.mid(pos+1).toShort();
}
else
{
address = host;
port = 80;
}
m_target = new QTcpSocket();
m_target->connectToHost(address, port);
return m_target->waitForConnected();
}
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