src/base/http/connection.cpp

   1 /*
   2  * Bittorrent Client using Qt and libtorrent.
   3  * Copyright (C) 2018  Mike Tzou (Chocobo1)
   4  * Copyright (C) 2014  Vladimir Golovnev <glassez@yandex.ru>
   5  * Copyright (C) 2006  Ishan Arora and Christophe Dumez <chris@qbittorrent.org>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  20  *
  21  * In addition, as a special exception, the copyright holders give permission to
  22  * link this program with the OpenSSL project's "OpenSSL" library (or with
  23  * modified versions of it that use the same license as the "OpenSSL" library),
  24  * and distribute the linked executables. You must obey the GNU General Public
  25  * License in all respects for all of the code used other than "OpenSSL".  If you
  26  * modify file(s), you may extend this exception to your version of the file(s),
  27  * but you are not obligated to do so. If you do not wish to do so, delete this
  28  * exception statement from your version.
  29  */
  30
  31 #include "connection.h"
  32
  33 #include <QTcpSocket>
  34
  35 #include "base/logger.h"
  36 #include "irequesthandler.h"
  37 #include "requestparser.h"
  38 #include "responsegenerator.h"
  39
  40 using namespace Http;
  41
  42 Connection::Connection(QTcpSocket *socket, IRequestHandler *requestHandler, QObject *parent)
  43     : QObject(parent)
  44     , m_socket(socket)
  45     , m_requestHandler(requestHandler)
  46 {
  47     m_socket->setParent(this);
  48     m_idleTimer.start();
  49     connect(m_socket, &QTcpSocket::readyRead, this, &Connection::read);
  50 }
  51
  52 Connection::~Connection()
  53 {
  54     m_socket->close();
  55 }
  56
  57 void Connection::read()
  58 {
  59     m_idleTimer.restart();
  60     m_receivedData.append(m_socket->readAll());
  61
  62     while (!m_receivedData.isEmpty())
  63     {
  64         const RequestParser::ParseResult result = RequestParser::parse(m_receivedData);
  65
  66         switch (result.status)
  67         {
  68         case RequestParser::ParseStatus::Incomplete:
  69         {
  70                 const long bufferLimit = RequestParser::MAX_CONTENT_SIZE * 1.1;  // some margin for headers
  71                 if (m_receivedData.size() > bufferLimit)
  72                 {
  73                     Logger::instance()->addMessage(tr("Http request size exceeds limitation, closing socket. Limit: %1, IP: %2")
  74                         .arg(bufferLimit).arg(m_socket->peerAddress().toString()), Log::WARNING);
  75
  76                     Response resp(413, "Payload Too Large");
  77                     resp.headers[HEADER_CONNECTION] = "close";
  78
  79                     sendResponse(resp);
  80                     m_socket->close();
  81                 }
  82             }
  83             return;
  84
  85         case RequestParser::ParseStatus::BadRequest:
  86         {
  87                 Logger::instance()->addMessage(tr("Bad Http request, closing socket. IP: %1")
  88                     .arg(m_socket->peerAddress().toString()), Log::WARNING);
  89
  90                 Response resp(400, "Bad Request");
  91                 resp.headers[HEADER_CONNECTION] = "close";
  92
  93                 sendResponse(resp);
  94                 m_socket->close();
  95             }
  96             return;
  97
  98         case RequestParser::ParseStatus::OK:
  99         {
 100                 const Environment env {m_socket->localAddress(), m_socket->localPort(), m_socket->peerAddress(), m_socket->peerPort()};
 101
 102                 Response resp = m_requestHandler->processRequest(result.request, env);
 103
 104                 if (acceptsGzipEncoding(result.request.headers["accept-encoding"]))
 105                     resp.headers[HEADER_CONTENT_ENCODING] = "gzip";
 106
 107                 resp.headers[HEADER_CONNECTION] = "keep-alive";
 108
 109                 sendResponse(resp);
 110                 m_receivedData = m_receivedData.mid(result.frameSize);
 111             }
 112             break;
 113
 114         default:
 115             Q_ASSERT(false);
 116             return;
 117         }
 118     }
 119 }
 120
 121 void Connection::sendResponse(const Response &response) const
 122 {
 123     m_socket->write(toByteArray(response));
 124 }
 125
 126 bool Connection::hasExpired(const qint64 timeout) const
 127 {
 128     return m_idleTimer.hasExpired(timeout);
 129 }
 130
 131 bool Connection::isClosed() const
 132 {
 133     return (m_socket->state() == QAbstractSocket::UnconnectedState);
 134 }
 135
 136 bool Connection::acceptsGzipEncoding(QString codings)
 137 {
 138     // [rfc7231] 5.3.4. Accept-Encoding
 139
 140     const auto isCodingAvailable = [](const QList<QStringView> &list, const QStringView encoding) -> bool
 141     {
 142         for (const QStringView &str : list)
 143         {
 144             if (!str.startsWith(encoding))
 145                 continue;
 146
 147             // without quality values
 148             if (str == encoding)
 149                 return true;
 150
 151             // [rfc7231] 5.3.1. Quality Values
 152             const QStringView substr = str.mid(encoding.size() + 3);  // ex. skip over "gzip;q="
 153
 154             bool ok = false;
 155             const double qvalue = substr.toDouble(&ok);
 156             if (!ok || (qvalue <= 0))
 157                 return false;
 158
 159             return true;
 160         }
 161         return false;
 162     };
 163
 164     const QList<QStringView> list = QStringView(codings.remove(' ').remove('\t')).split(u',', Qt::SkipEmptyParts);
 165     if (list.isEmpty())
 166         return false;
 167
 168     const bool canGzip = isCodingAvailable(list, QString::fromLatin1("gzip"));
 169     if (canGzip)
 170         return true;
 171
 172     const bool canAny = isCodingAvailable(list, QString::fromLatin1("*"));
 173     if (canAny)
 174         return true;
 175
 176     return false;
 177 }