Implement new download manager.

src/core/net/downloadhandler.cpp

@@ -0,0 +1,289 @@
+/*
+ * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2015  Vladimir Golovnev <glassez@yandex.ru>
+ * Copyright (C) 2006  Christophe Dumez <chris@qbittorrent.org>
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If you
+ * modify file(s), you may extend this exception to your version of the file(s),
+ * but you are not obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ */
+
+#include <QTemporaryFile>
+#include <QNetworkAccessManager>
+#include <QNetworkRequest>
+#include <QNetworkReply>
+#include <QNetworkProxy>
+#include <QNetworkCookie>
+#include <QDebug>
+
+#include <zlib.h>
+
+#include "fs_utils.h"
+#include "misc.h"
+#include "downloadmanager.h"
+#include "downloadhandler.h"
+
+static QString errorCodeToString(QNetworkReply::NetworkError status);
+static QByteArray gUncompress(Bytef *inData, uInt len);
+
+using namespace Net;
+
+DownloadHandler::DownloadHandler(QNetworkReply *reply, DownloadManager *manager, qint64 limit)
+    : QObject(manager)
+    , m_reply(reply)
+    , m_manager(manager)
+    , m_sizeLimit(limit)
+    , m_url(reply->url().toString())
+{
+    init();
+}
+
+DownloadHandler::~DownloadHandler()
+{
+    if (m_reply)
+        delete m_reply;
+}
+
+// Returns original url
+QString DownloadHandler::url() const
+{
+    return m_url;
+}
+
+void DownloadHandler::processFinishedDownload()
+{
+    QString url = m_reply->url().toString();
+    qDebug("Download finished: %s", qPrintable(url));
+    // Check if the request was successful
+    if (m_reply->error() != QNetworkReply::NoError) {
+        // Failure
+        qDebug("Download failure (%s), reason: %s", qPrintable(url), qPrintable(errorCodeToString(m_reply->error())));
+        emit downloadFailed(m_url, errorCodeToString(m_reply->error()));
+        this->deleteLater();
+    }
+    else {
+        // Check if the server ask us to redirect somewhere else
+        const QVariant redirection = m_reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
+        if (redirection.isValid()) {
+            // We should redirect
+            handleRedirection(redirection.toUrl());
+        }
+        else {
+            // Success
+            QString filePath;
+            if (saveToFile(filePath))
+                emit downloadFinished(m_url, filePath);
+            else
+                emit downloadFailed(m_url, tr("I/O Error"));
+            this->deleteLater();
+        }
+    }
+}
+
+void DownloadHandler::checkDownloadSize(qint64 bytesReceived, qint64 bytesTotal)
+{
+    QString msg = tr("The file size is %1. It exceeds the download limit of %2.");
+
+    if (bytesTotal > 0) {
+        // Total number of bytes is available
+        if (bytesTotal > m_sizeLimit) {
+            m_reply->abort();
+            emit downloadFailed(m_url, msg.arg(misc::friendlyUnit(bytesTotal)).arg(misc::friendlyUnit(m_sizeLimit)));
+        }
+        else {
+            disconnect(m_reply, SIGNAL(downloadProgress(qint64, qint64)), this, SLOT(checkDownloadSize(qint64, qint64)));
+        }
+    }
+    else if (bytesReceived  > m_sizeLimit) {
+        m_reply->abort();
+        emit downloadFailed(m_url, msg.arg(misc::friendlyUnit(bytesReceived)).arg(misc::friendlyUnit(m_sizeLimit)));
+    }
+}
+
+void DownloadHandler::init()
+{
+    m_reply->setParent(this);
+    if (m_sizeLimit > 0)
+        connect(m_reply, SIGNAL(downloadProgress(qint64, qint64)), this, SLOT(checkDownloadSize(qint64, qint64)));
+    connect(m_reply, SIGNAL(finished()), this, SLOT(processFinishedDownload()));
+}
+
+bool DownloadHandler::saveToFile(QString &filePath)
+{
+    QTemporaryFile *tmpfile = new QTemporaryFile;
+    if (!tmpfile->open()) {
+        delete tmpfile;
+        return false;
+    }
+
+    tmpfile->setAutoRemove(false);
+    filePath = tmpfile->fileName();
+    qDebug("Temporary filename is: %s", qPrintable(filePath));
+    if (m_reply->isOpen() || m_reply->open(QIODevice::ReadOnly)) {
+        QByteArray replyData = m_reply->readAll();
+        if (m_reply->rawHeader("Content-Encoding") == "gzip") {
+            // uncompress gzip reply
+            replyData = gUncompress(reinterpret_cast<unsigned char*>(replyData.data()), static_cast<uInt>(replyData.length()));
+        }
+        tmpfile->write(replyData);
+        tmpfile->close();
+        // XXX: tmpfile needs to be deleted on Windows before using the file
+        // or it will complain that the file is used by another process.
+        delete tmpfile;
+        return true;
+    }
+    else {
+        delete tmpfile;
+        fsutils::forceRemove(filePath);
+    }
+
+    return false;
+}
+
+void DownloadHandler::handleRedirection(QUrl newUrl)
+{
+    // Resolve relative urls
+    if (newUrl.isRelative())
+        newUrl = m_reply->url().resolved(newUrl);
+
+    const QString newUrlString = newUrl.toString();
+    qDebug("Redirecting from %s to %s", qPrintable(m_reply->url().toString()), qPrintable(newUrlString));
+
+    // Redirect to magnet workaround
+    if (newUrlString.startsWith("magnet:", Qt::CaseInsensitive)) {
+        qDebug("Magnet redirect detected.");
+        m_reply->abort();
+        emit redirectedToMagnet(m_url, newUrlString);
+        this->deleteLater();
+    }
+    else {
+        DownloadHandler *tmp = m_manager->downloadUrl(newUrlString, m_sizeLimit);
+        m_reply->deleteLater();
+        m_reply = tmp->m_reply;
+        m_sizeLimit = tmp->m_sizeLimit;
+        init();
+        tmp->m_reply = 0;
+        delete tmp;
+    }
+}
+
+QString errorCodeToString(QNetworkReply::NetworkError status)
+{
+    switch(status) {
+    case QNetworkReply::HostNotFoundError:
+        return QObject::tr("The remote host name was not found (invalid hostname)");
+    case QNetworkReply::OperationCanceledError:
+        return QObject::tr("The operation was canceled");
+    case QNetworkReply::RemoteHostClosedError:
+        return QObject::tr("The remote server closed the connection prematurely, before the entire reply was received and processed");
+    case QNetworkReply::TimeoutError:
+        return QObject::tr("The connection to the remote server timed out");
+    case QNetworkReply::SslHandshakeFailedError:
+        return QObject::tr("SSL/TLS handshake failed");
+    case QNetworkReply::ConnectionRefusedError:
+        return QObject::tr("The remote server refused the connection");
+    case QNetworkReply::ProxyConnectionRefusedError:
+        return QObject::tr("The connection to the proxy server was refused");
+    case QNetworkReply::ProxyConnectionClosedError:
+        return QObject::tr("The proxy server closed the connection prematurely");
+    case QNetworkReply::ProxyNotFoundError:
+        return QObject::tr("The proxy host name was not found");
+    case QNetworkReply::ProxyTimeoutError:
+        return QObject::tr("The connection to the proxy timed out or the proxy did not reply in time to the request sent");
+    case QNetworkReply::ProxyAuthenticationRequiredError:
+        return QObject::tr("The proxy requires authentication in order to honour the request but did not accept any credentials offered");
+    case QNetworkReply::ContentAccessDenied:
+        return QObject::tr("The access to the remote content was denied (401)");
+    case QNetworkReply::ContentOperationNotPermittedError:
+        return QObject::tr("The operation requested on the remote content is not permitted");
+    case QNetworkReply::ContentNotFoundError:
+        return QObject::tr("The remote content was not found at the server (404)");
+    case QNetworkReply::AuthenticationRequiredError:
+        return QObject::tr("The remote server requires authentication to serve the content but the credentials provided were not accepted");
+    case QNetworkReply::ProtocolUnknownError:
+        return QObject::tr("The Network Access API cannot honor the request because the protocol is not known");
+    case QNetworkReply::ProtocolInvalidOperationError:
+        return QObject::tr("The requested operation is invalid for this protocol");
+    case QNetworkReply::UnknownNetworkError:
+        return QObject::tr("An unknown network-related error was detected");
+    case QNetworkReply::UnknownProxyError:
+        return QObject::tr("An unknown proxy-related error was detected");
+    case QNetworkReply::UnknownContentError:
+        return QObject::tr("An unknown error related to the remote content was detected");
+    case QNetworkReply::ProtocolFailure:
+        return QObject::tr("A breakdown in protocol was detected");
+    default:
+        return QObject::tr("Unknown error");
+    }
+}
+
+QByteArray gUncompress(Bytef *inData, uInt len)
+{
+    if (len <= 4) {
+        qWarning("gUncompress: Input data is truncated");
+        return QByteArray();
+    }
+
+    QByteArray result;
+
+    z_stream strm;
+    static const int CHUNK_SIZE = 1024;
+    char out[CHUNK_SIZE];
+
+    /* allocate inflate state */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    strm.avail_in = len;
+    strm.next_in = inData;
+
+    const int windowBits = 15;
+    const int ENABLE_ZLIB_GZIP = 32;
+
+    int ret = inflateInit2(&strm, windowBits | ENABLE_ZLIB_GZIP); // gzip decoding
+    if (ret != Z_OK)
+        return QByteArray();
+
+    // run inflate()
+    do {
+        strm.avail_out = CHUNK_SIZE;
+        strm.next_out = reinterpret_cast<unsigned char*>(out);
+
+        ret = inflate(&strm, Z_NO_FLUSH);
+        Q_ASSERT(ret != Z_STREAM_ERROR); // state not clobbered
+
+        switch (ret) {
+        case Z_NEED_DICT:
+        case Z_DATA_ERROR:
+        case Z_MEM_ERROR:
+            (void) inflateEnd(&strm);
+            return QByteArray();
+        }
+
+        result.append(out, CHUNK_SIZE - strm.avail_out);
+    }
+    while (!strm.avail_out);
+
+    // clean up and return
+    inflateEnd(&strm);
+    return result;
+}