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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
//#define QNETWORKACCESSCACHEBACKEND_DEBUG
#include "qnetworkaccesscachebackend_p.h"
#include "qabstractnetworkcache.h"
#include "qfileinfo.h"
#include "qdir.h"
#include "qcoreapplication.h"
#include "qhash.h"
QT_BEGIN_NAMESPACE
QNetworkAccessCacheBackend::QNetworkAccessCacheBackend()
: QNetworkAccessBackend(QNetworkAccessBackend::TargetType::Local)
{
}
QNetworkAccessCacheBackend::~QNetworkAccessCacheBackend()
{
}
void QNetworkAccessCacheBackend::open()
{
if (operation() != QNetworkAccessManager::GetOperation || !sendCacheContents()) {
QString msg = QCoreApplication::translate("QNetworkAccessCacheBackend", "Error opening %1")
.arg(this->url().toString());
error(QNetworkReply::ContentNotFoundError, msg);
} else {
setAttribute(QNetworkRequest::SourceIsFromCacheAttribute, true);
}
finished();
}
bool QNetworkAccessCacheBackend::sendCacheContents()
{
setCachingEnabled(false);
QAbstractNetworkCache *nc = networkCache();
if (!nc)
return false;
QNetworkCacheMetaData item = nc->metaData(url());
if (!item.isValid())
return false;
QNetworkCacheMetaData::AttributesMap attributes = item.attributes();
setAttribute(QNetworkRequest::HttpStatusCodeAttribute, attributes.value(QNetworkRequest::HttpStatusCodeAttribute));
setAttribute(QNetworkRequest::HttpReasonPhraseAttribute, attributes.value(QNetworkRequest::HttpReasonPhraseAttribute));
// set the raw headers
const QNetworkCacheMetaData::RawHeaderList rawHeaders = item.rawHeaders();
for (const auto &header : rawHeaders) {
if (header.first.toLower() == "cache-control") {
const QByteArray cacheControlValue = header.second.toLower();
if (cacheControlValue.contains("must-revalidate")
|| cacheControlValue.contains("no-cache")) {
return false;
}
}
setRawHeader(header.first, header.second);
}
// handle a possible redirect
QVariant redirectionTarget = attributes.value(QNetworkRequest::RedirectionTargetAttribute);
if (redirectionTarget.isValid()) {
setAttribute(QNetworkRequest::RedirectionTargetAttribute, redirectionTarget);
redirectionRequested(redirectionTarget.toUrl());
}
// signal we're open
metaDataChanged();
if (operation() == QNetworkAccessManager::GetOperation) {
device = nc->data(url());
if (!device)
return false;
device->setParent(this);
readyRead();
}
#if defined(QNETWORKACCESSCACHEBACKEND_DEBUG)
qDebug() << "Successfully sent cache:" << url();
#endif
return true;
}
bool QNetworkAccessCacheBackend::start()
{
open();
return true;
}
void QNetworkAccessCacheBackend::close() { }
qint64 QNetworkAccessCacheBackend::bytesAvailable() const
{
return device ? device->bytesAvailable() : qint64(0);
}
qint64 QNetworkAccessCacheBackend::read(char *data, qint64 maxlen)
{
return device ? device->read(data, maxlen) : qint64(0);
}
QT_END_NAMESPACE
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