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/* NitroShare - A simple network file sharing tool.
Copyright (C) 2012 Nathan Osman
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 <QDebug>
#include <QFile>
#include <QFileInfo>
#include <QVariantList>
#include <qjson/qobjecthelper.h>
#include <file/CFileSender.h>
#include <util/settings.h>
CFileSender::CFileSender(QObject * parent, QStringList filenames)
: CBasicSocket(parent), m_state(WaitingForConnection),
m_total_uncompressed(0), m_current_uncompressed(0)
{
connect(this, SIGNAL(connected()), SLOT(OnConnected()));
connect(this, SIGNAL(Data(QByteArray)), SLOT(OnData(QByteArray)));
/* Immediately begin preparing the headers for the transfer. */
PrepareHeaders(filenames);
}
CFileSender::~CFileSender()
{
qDeleteAll(m_headers);
}
void CFileSender::Start(CMachine machine)
{
qDebug() << "Attempting connection to" << machine.address.toString() << "...";
/* Once we know the information for connecting to the remote
machine, we immediately attempt a connection. */
connectToHost(machine.address, machine.port);
}
void CFileSender::OnConnected()
{
qDebug() << "Connection with remote server established.";
/* Once we have established connection with the remote machine,
we immediately begin sending headers for all of the files. */
QVariantList header_list;
foreach(CFileHeader * header, m_headers)
header_list.append(QJson::QObjectHelper::qobject2qvariant(header));
/* Prepare the JSON object we will send over the wire containing
the header and some other basic information about the transfer. */
QVariantMap map;
map["hostname"] = Settings::Get("General/MachineName");
map["files"] = header_list;
SendData(EncodeJSON(map));
/* Our current state is now waiting for the response from the remote machine. */
qDebug() << "File headers sent, awaiting server response.";
m_state = WaitingForHeaderResponse;
}
void CFileSender::OnData(QByteArray data)
{
qDebug() << "Data received from remote server" << data;
/* The client sends us two messages during the process.
- the first is immediately after we send the headers
- the second occurs after each file transfer
Both of these responses are in JSON format. */
QVariantMap response = DecodeJSON(data);
if(!response.contains("status") || response["status"] != "continue")
{
emit Message("The remote machine aborted the transfer.", QSystemTrayIcon::Critical);
disconnectFromHost();
return;
}
/* Regardless of our current state, we can assume our task here is to begin
transferring the next file in the list (if there is one). */
m_state = TransferringFiles;
if(m_headers.size())
{
CFileHeader * header = m_headers.takeFirst();
SendFile(header);
delete header;
}
/* Otherwise we're done! Emit the signal and disconnect from the server. */
else
{
emit Progress(ProgressComplete);
disconnectFromHost();
}
}
void CFileSender::PrepareHeaders(QStringList filenames)
{
/* Loop through all of the files that we are sending, finding out
some basic information about each and marking whether the contents
are compressed or should contain a CRC checksum. */
bool compress = Settings::Get("General/CompressFiles").toBool();
bool checksum = Settings::Get("General/CalculateChecksum").toBool();
foreach(QString filename, filenames)
{
QFileInfo info(filename);
CFileHeader * header = new CFileHeader(filename);
header->SetFilename(info.fileName());
header->SetUncompressedSize(info.size());
header->SetCompressed(compress);
header->SetChecksum(checksum);
m_headers.append(header);
/* Add the uncompressed size to our running total. */
m_total_uncompressed += info.size();
}
}
void CFileSender::SendFile(CFileHeader * header)
{
qDebug() << "Preparing to transfer" << header->GetFilename() << "...";
/* Now we actually begin the transmission of the file. */
QByteArray contents;
qint64 uncompressed_size;
if(header->GetContents(contents, uncompressed_size))
{
/* Calculate the checksum if requested. */
if(header->GetChecksum())
{
QByteArray crc = QByteArray::number(qChecksum(contents.data(), contents.size()));
contents.prepend(crc + TerminatingCharacter);
qDebug() << "Calculated CRC:" << crc;
}
/* Send the actual data. */
SendData(contents);
/* Emit a signal indicating progress. */
m_current_uncompressed += uncompressed_size;
emit Progress((double)m_current_uncompressed / (double)m_total_uncompressed * 100.0);
}
else
disconnectFromHost();
}
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