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/*
* Copyright (C) 2019 KeePassXC Team <team@keepassxc.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 or (at your option)
* version 3 of the License.
*
* 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 "IconDownloader.h"
#include "core/Config.h"
#include "core/NetworkManager.h"
#include <QHostInfo>
#include <QtNetwork>
#define MAX_REDIRECTS 5
IconDownloader::IconDownloader(QObject* parent)
: QObject(parent)
, m_reply(nullptr)
, m_redirects(0)
{
m_timeout.setSingleShot(true);
connect(&m_timeout, SIGNAL(timeout()), SLOT(abortDownload()));
}
IconDownloader::~IconDownloader()
{
abortDownload();
}
namespace
{
// Try to get the 2nd level domain of the host part of a QUrl. For example,
// "foo.bar.example.com" would become "example.com", and "foo.bar.example.co.uk"
// would become "example.co.uk".
QString getSecondLevelDomain(const QUrl& url)
{
QString fqdn = url.host();
fqdn.truncate(fqdn.length() - url.topLevelDomain().length());
QStringList parts = fqdn.split('.');
QString newdom = parts.takeLast() + url.topLevelDomain();
return newdom;
}
QUrl convertVariantToUrl(const QVariant& var)
{
QUrl url;
if (var.canConvert<QUrl>()) {
url = var.toUrl();
}
return url;
}
QUrl getRedirectTarget(QNetworkReply* reply)
{
QVariant var = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
QUrl url = convertVariantToUrl(var);
return url;
}
} // namespace
void IconDownloader::setUrl(const QString& entryUrl)
{
m_url = entryUrl;
QUrl url(m_url);
if (!url.isValid()) {
return;
}
m_redirects = 0;
m_urlsToTry.clear();
if (url.scheme().isEmpty()) {
url.setUrl(QString("https://%1").arg(url.toString()));
}
QString fullyQualifiedDomain = url.host();
// Determine if host portion of URL is an IP address by resolving it and
// searching for a match with the returned address(es).
bool hostIsIp = false;
QList<QHostAddress> hostAddressess = QHostInfo::fromName(fullyQualifiedDomain).addresses();
for (auto addr : hostAddressess) {
if (addr.toString() == fullyQualifiedDomain) {
hostIsIp = true;
}
}
// Determine the second-level domain, if available
QString secondLevelDomain;
if (!hostIsIp) {
secondLevelDomain = getSecondLevelDomain(m_url);
}
// Start with the "fallback" url (if enabled) to try to get the best favicon
if (config()->get("security/IconDownloadFallback", false).toBool()) {
QUrl fallbackUrl = QUrl("https://icons.duckduckgo.com");
fallbackUrl.setPath("/ip3/" + QUrl::toPercentEncoding(fullyQualifiedDomain) + ".ico");
m_urlsToTry.append(fallbackUrl);
// Also try a direct pull of the second-level domain (if possible)
if (!hostIsIp && fullyQualifiedDomain != secondLevelDomain) {
fallbackUrl.setPath("/ip3/" + QUrl::toPercentEncoding(secondLevelDomain) + ".ico");
m_urlsToTry.append(fallbackUrl);
}
}
// Add a direct pull of the website's own favicon.ico file
m_urlsToTry.append(QUrl(url.scheme() + "://" + fullyQualifiedDomain + "/favicon.ico"));
// Also try a direct pull of the second-level domain (if possible)
if (!hostIsIp && fullyQualifiedDomain != secondLevelDomain) {
m_urlsToTry.append(QUrl(url.scheme() + "://" + secondLevelDomain + "/favicon.ico"));
}
}
void IconDownloader::download()
{
if (!m_timeout.isActive()) {
int timeout = config()->get("FaviconDownloadTimeout", 10).toInt();
m_timeout.start(timeout * 1000);
// Use the first URL to start the download process
// If a favicon is not found, the next URL will be tried
fetchFavicon(m_urlsToTry.takeFirst());
}
}
void IconDownloader::abortDownload()
{
if (m_reply) {
m_reply->abort();
}
}
void IconDownloader::fetchFavicon(const QUrl& url)
{
m_bytesReceived.clear();
m_fetchUrl = url;
QNetworkRequest request(url);
m_reply = getNetMgr()->get(request);
connect(m_reply, &QNetworkReply::finished, this, &IconDownloader::fetchFinished);
connect(m_reply, &QIODevice::readyRead, this, &IconDownloader::fetchReadyRead);
}
void IconDownloader::fetchReadyRead()
{
m_bytesReceived += m_reply->readAll();
}
void IconDownloader::fetchFinished()
{
QImage image;
QString url = m_url;
bool error = (m_reply->error() != QNetworkReply::NoError);
QUrl redirectTarget = getRedirectTarget(m_reply);
m_reply->deleteLater();
m_reply = nullptr;
if (!error) {
if (redirectTarget.isValid()) {
// Redirected, we need to follow it, or fall through if we have
// done too many redirects already.
if (m_redirects < MAX_REDIRECTS) {
m_redirects++;
if (redirectTarget.isRelative()) {
redirectTarget = m_fetchUrl.resolved(redirectTarget);
}
m_urlsToTry.prepend(redirectTarget);
}
} else {
// No redirect, and we theoretically have some icon data now.
image.loadFromData(m_bytesReceived);
}
}
if (!image.isNull()) {
// Valid icon received
m_timeout.stop();
emit finished(url, image);
} else if (!m_urlsToTry.empty()) {
// Try the next url
m_redirects = 0;
fetchFavicon(m_urlsToTry.takeFirst());
} else {
// No icon found
m_timeout.stop();
emit finished(url, image);
}
}
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