sdrangel/sdrbase/util/httpdownloadmanager.cpp

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6.4 KiB
C++
Czysty Zwykły widok Historia

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2020 Jon Beniston, M7RCE //
// //
// 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 as 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 V3 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 "httpdownloadmanager.h"
#include <QDebug>
#include <QFile>
#include <QDateTime>
#include <QRegExp>
HttpDownloadManager::HttpDownloadManager()
{
connect(&manager, &QNetworkAccessManager::finished, this, &HttpDownloadManager::downloadFinished);
}
QNetworkReply *HttpDownloadManager::download(const QUrl &url, const QString &filename)
{
QNetworkRequest request(url);
request.setAttribute(QNetworkRequest::RedirectPolicyAttribute, QNetworkRequest::NoLessSafeRedirectPolicy);
QNetworkReply *reply = manager.get(request);
connect(reply, &QNetworkReply::sslErrors, this, &HttpDownloadManager::sslErrors);
qDebug() << "HttpDownloadManager: Downloading from " << url << " to " << filename;
m_downloads.append(reply);
m_filenames.append(filename);
return reply;
}
// Indicate if we have any downloads in progress
bool HttpDownloadManager::downloading() const
{
return m_filenames.size() > 0;
}
qint64 HttpDownloadManager::fileAgeInDays(const QString& filename)
{
QFile file(filename);
if (file.exists())
{
QDateTime modified = file.fileTime(QFileDevice::FileModificationTime);
if (modified.isValid())
return modified.daysTo(QDateTime::currentDateTime());
else
return -1;
}
return -1;
}
// Get default directory to write downloads to
QString HttpDownloadManager::downloadDir()
{
// Get directory to store app data in
QStringList locations = QStandardPaths::standardLocations(QStandardPaths::AppDataLocation);
// First dir is writable
return locations[0];
}
void HttpDownloadManager::sslErrors(const QList<QSslError> &sslErrors)
{
for (const QSslError &error : sslErrors)
qCritical() << "HttpDownloadManager: SSL error: " << error.errorString();
}
bool HttpDownloadManager::isHttpRedirect(QNetworkReply *reply)
{
int status = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
// 304 is file not changed, but maybe we did
return (status >= 301 && status <= 308);
}
bool HttpDownloadManager::writeToFile(const QString &filename, const QByteArray &data)
{
QFile file(filename);
// Make sure directory to save the file in exists
QFileInfo fileInfo(filename);
QDir dir = fileInfo.absoluteDir();
if (!dir.exists())
dir.mkpath(".");
if (file.open(QIODevice::WriteOnly))
{
file.write(data);
file.close();
return true;
}
else
{
qCritical() << "HttpDownloadManager: Could not open " << filename << " for writing: " << file.errorString();
return false;
}
}
void HttpDownloadManager::downloadFinished(QNetworkReply *reply)
{
QString url = reply->url().toEncoded().constData();
int idx = m_downloads.indexOf(reply);
QString filename = m_filenames[idx];
bool success = false;
bool retry = false;
if (!reply->error())
{
if (!isHttpRedirect(reply))
{
QByteArray data = reply->readAll();
QRegExp regexp("href=\\\"\\/uc\\?export\\=download\\&amp\\;confirm=([a-zA-Z0-9_\\-]*)\\&amp\\;id=([a-zA-Z0-9_\\-\\=\\;\\&]*)\\\"");
// Google drive can redirect downloads to a virus scan warning page
// We need to extract the confirm code and retry
if (url.startsWith("https://drive.google.com/uc?export=download")
&& data.startsWith("<!DOCTYPE html>")
&& !filename.endsWith(".html")
&& (regexp.indexIn(data) >= 0)
)
{
QString confirm = regexp.capturedTexts()[1];
QString id = regexp.capturedTexts()[2];
if (confirm.isEmpty())
{
qDebug() << "HttpDownloadManager::downloadFinished - Got HTML response but not confirmation code";
qDebug() << QString(data);
qDebug() << regexp.capturedTexts();
}
m_downloads.removeAll(reply);
m_filenames.remove(idx);
qDebug() << "HttpDownloadManager: Skipping Google drive warning: " << confirm << " " << id;
QUrl newUrl(QString("https://drive.google.com/uc?export=download&confirm=%1&id=%2").arg(confirm).arg(id));
QNetworkReply *newReply = download(newUrl, filename);
// Indicate that we are retrying, so progress dialogs can be updated
emit retryDownload(filename, reply, newReply);
retry = true;
}
else if (writeToFile(filename, data))
{
success = true;
qDebug() << "HttpDownloadManager: Download from " << url << " to " << filename << " finshed.";
}
}
else
{
qDebug() << "HttpDownloadManager: Request to download " << url << " was redirected.";
}
}
else
{
qCritical() << "HttpDownloadManager: Download of " << url << " failed: " << reply->errorString();
}
if (!retry)
{
m_downloads.removeAll(reply);
m_filenames.remove(idx);
emit downloadComplete(filename, success, url, reply->errorString());
}
reply->deleteLater();
}