1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the QtNetwork module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40//#define QNETWORKACCESSCACHEBACKEND_DEBUG
41
42#include "qnetworkaccesscachebackend_p.h"
43#include "qabstractnetworkcache.h"
44#include "qfileinfo.h"
45#if QT_CONFIG(ftp)
46#include "qurlinfo_p.h"
47#endif
48#include "qdir.h"
49#include "qcoreapplication.h"
50
51QT_BEGIN_NAMESPACE
52
53QNetworkAccessCacheBackend::QNetworkAccessCacheBackend()
54 : QNetworkAccessBackend()
55{
56}
57
58QNetworkAccessCacheBackend::~QNetworkAccessCacheBackend()
59{
60}
61
62void QNetworkAccessCacheBackend::open()
63{
64 if (operation() != QNetworkAccessManager::GetOperation || !sendCacheContents()) {
65 QString msg = QCoreApplication::translate(context: "QNetworkAccessCacheBackend", key: "Error opening %1")
66 .arg(a: this->url().toString());
67 error(code: QNetworkReply::ContentNotFoundError, errorString: msg);
68 } else {
69 setAttribute(code: QNetworkRequest::SourceIsFromCacheAttribute, value: true);
70 }
71 finished();
72}
73
74bool QNetworkAccessCacheBackend::sendCacheContents()
75{
76 setCachingEnabled(false);
77 QAbstractNetworkCache *nc = networkCache();
78 if (!nc)
79 return false;
80
81 QNetworkCacheMetaData item = nc->metaData(url: url());
82 if (!item.isValid())
83 return false;
84
85 QNetworkCacheMetaData::AttributesMap attributes = item.attributes();
86 setAttribute(code: QNetworkRequest::HttpStatusCodeAttribute, value: attributes.value(akey: QNetworkRequest::HttpStatusCodeAttribute));
87 setAttribute(code: QNetworkRequest::HttpReasonPhraseAttribute, value: attributes.value(akey: QNetworkRequest::HttpReasonPhraseAttribute));
88
89 // set the raw headers
90 const QNetworkCacheMetaData::RawHeaderList rawHeaders = item.rawHeaders();
91 for (const auto &header : rawHeaders) {
92 if (header.first.toLower() == "cache-control") {
93 const QByteArray cacheControlValue = header.second.toLower();
94 if (cacheControlValue.contains(c: "must-revalidate")
95 || cacheControlValue.contains(c: "no-cache")) {
96 return false;
97 }
98 }
99 setRawHeader(headerName: header.first, value: header.second);
100 }
101
102 // handle a possible redirect
103 QVariant redirectionTarget = attributes.value(akey: QNetworkRequest::RedirectionTargetAttribute);
104 if (redirectionTarget.isValid()) {
105 setAttribute(code: QNetworkRequest::RedirectionTargetAttribute, value: redirectionTarget);
106 redirectionRequested(destination: redirectionTarget.toUrl());
107 }
108
109 // signal we're open
110 metaDataChanged();
111
112 if (operation() == QNetworkAccessManager::GetOperation) {
113 QIODevice *contents = nc->data(url: url());
114 if (!contents)
115 return false;
116 contents->setParent(this);
117 writeDownstreamData(data: contents);
118 }
119
120#if defined(QNETWORKACCESSCACHEBACKEND_DEBUG)
121 qDebug() << "Successfully sent cache:" << url();
122#endif
123 return true;
124}
125
126bool QNetworkAccessCacheBackend::start()
127{
128 open();
129 return true;
130}
131
132void QNetworkAccessCacheBackend::closeDownstreamChannel()
133{
134}
135
136void QNetworkAccessCacheBackend::closeUpstreamChannel()
137{
138 Q_ASSERT_X(false, Q_FUNC_INFO, "This function show not have been called!");
139}
140
141void QNetworkAccessCacheBackend::upstreamReadyRead()
142{
143 Q_ASSERT_X(false, Q_FUNC_INFO, "This function show not have been called!");
144}
145
146void QNetworkAccessCacheBackend::downstreamReadyWrite()
147{
148 Q_ASSERT_X(false, Q_FUNC_INFO, "This function show not have been called!");
149}
150
151QT_END_NAMESPACE
152
153

source code of qtbase/src/network/access/qnetworkaccesscachebackend.cpp