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/*
QWebSockets implements the WebSocket protocol as defined in RFC 6455.
Copyright (C) 2013 Kurt Pattyn (pattyn.kurt@gmail.com)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "handshakeresponse_p.h"
#include "handshakerequest_p.h"
#include <QString>
#include <QTextStream>
#include <QByteArray>
#include <QStringList>
#include <QDateTime>
#include <QCryptographicHash>
#include <QSet>
#include <QList>
#include <QStringBuilder> //for more efficient string concatenation
QT_BEGIN_NAMESPACE
/*!
\internal
*/
HandshakeResponse::HandshakeResponse(const HandshakeRequest &request,
const QString &serverName,
bool isOriginAllowed,
const QList<QWebSocketProtocol::Version> &supportedVersions,
const QList<QString> &supportedProtocols,
const QList<QString> &supportedExtensions) :
m_isValid(false),
m_canUpgrade(false),
m_response(),
m_acceptedProtocol(),
m_acceptedExtension(),
m_acceptedVersion(QWebSocketProtocol::V_Unknow)
{
m_response = getHandshakeResponse(request, serverName, isOriginAllowed, supportedVersions, supportedProtocols, supportedExtensions);
m_isValid = true;
}
/*!
\internal
*/
HandshakeResponse::~HandshakeResponse()
{
}
/*!
\internal
*/
bool HandshakeResponse::isValid() const
{
return m_isValid;
}
/*!
\internal
*/
bool HandshakeResponse::canUpgrade() const
{
return m_isValid && m_canUpgrade;
}
/*!
\internal
*/
QString HandshakeResponse::getAcceptedProtocol() const
{
return m_acceptedProtocol;
}
/*!
\internal
*/
QString HandshakeResponse::calculateAcceptKey(const QString &key) const
{
QString tmpKey = key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"; //the UID comes from RFC6455
QByteArray hash = QCryptographicHash::hash(tmpKey.toLatin1(), QCryptographicHash::Sha1);
return QString(hash.toBase64());
}
/*!
\internal
*/
QString HandshakeResponse::getHandshakeResponse(const HandshakeRequest &request,
const QString &serverName,
bool isOriginAllowed,
const QList<QWebSocketProtocol::Version> &supportedVersions,
const QList<QString> &supportedProtocols,
const QList<QString> &supportedExtensions)
{
QStringList response;
m_canUpgrade = false;
if (!isOriginAllowed)
{
if (!m_canUpgrade)
{
response << "HTTP/1.1 403 Access Forbidden";
}
}
else
{
if (request.isValid())
{
QString acceptKey = calculateAcceptKey(request.getKey());
QList<QString> matchingProtocols = supportedProtocols.toSet().intersect(request.getProtocols().toSet()).toList();
QList<QString> matchingExtensions = supportedExtensions.toSet().intersect(request.getExtensions().toSet()).toList();
QList<QWebSocketProtocol::Version> matchingVersions = request.getVersions().toSet().intersect(supportedVersions.toSet()).toList();
qStableSort(matchingVersions.begin(), matchingVersions.end(), qGreater<QWebSocketProtocol::Version>()); //sort in descending order
if (matchingVersions.isEmpty())
{
m_canUpgrade = false;
}
else
{
response << "HTTP/1.1 101 Switching Protocols" <<
"Upgrade: websocket" <<
"Connection: Upgrade" <<
"Sec-WebSocket-Accept: " % acceptKey;
if (!matchingProtocols.isEmpty())
{
m_acceptedProtocol = matchingProtocols.first();
response << "Sec-WebSocket-Protocol: " % m_acceptedProtocol;
}
if (!matchingExtensions.isEmpty())
{
m_acceptedExtension = matchingExtensions.first();
response << "Sec-WebSocket-Extensions: " % m_acceptedExtension;
}
QString origin = request.getOrigin().trimmed();
if (origin.isEmpty())
{
origin = "*";
}
response << "Server: " + serverName <<
"Access-Control-Allow-Credentials: false" << //do not allow credentialed request (containing cookies)
"Access-Control-Allow-Methods: GET" << //only GET is allowed during handshaking
"Access-Control-Allow-Headers: content-type" << //this is OK; only the content-type header is allowed, no other headers are accepted
"Access-Control-Allow-Origin: " % origin <<
"Date: " % QDateTime::currentDateTimeUtc().toString("ddd, dd MMM yyyy hh:mm:ss 'GMT'");
m_acceptedVersion = QWebSocketProtocol::currentVersion();
m_canUpgrade = true;
}
}
else
{
m_canUpgrade = false;
}
if (!m_canUpgrade)
{
response << "HTTP/1.1 400 Bad Request";
QStringList versions;
Q_FOREACH(QWebSocketProtocol::Version version, supportedVersions)
{
versions << QString::number(static_cast<int>(version));
}
response << "Sec-WebSocket-Version: " % versions.join(", ");
}
}
response << "\r\n"; //append empty line at end of header
return response.join("\r\n");
}
/*!
\internal
*/
QTextStream &HandshakeResponse::writeToStream(QTextStream &textStream) const
{
if (!m_response.isEmpty())
{
textStream << m_response.toLatin1().constData();
}
else
{
textStream.setStatus(QTextStream::WriteFailed);
}
return textStream;
}
/*!
\internal
*/
QTextStream &operator <<(QTextStream &stream, const HandshakeResponse &response)
{
return response.writeToStream(stream);
}
/*!
\internal
*/
QWebSocketProtocol::Version HandshakeResponse::getAcceptedVersion() const
{
return m_acceptedVersion;
}
/*!
\internal
*/
QString HandshakeResponse::getAcceptedExtension() const
{
return m_acceptedExtension;
}
QT_END_NAMESPACE
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