network API: add support for HTTP multipart messages

This commit adds two new classes, QHttpPart and QHttpMultiPart, and
two new overloads to QNetworkAccessManager:
post(const QNetworkRequest &request, QHttpMultiPart *multiPart) and
put(const QNetworkRequest &request, QHttpMultiPart *multiPart).

With those classes, it is possible to do a HTTP POST with a multipart
message in a memory-saving way: The data from the parts is not copied
when read from a file or another QIODevice.

Reviewed-by: Markus Goetz
Task-number: QTBUG-6222

2 files changed, 132 insertions, 0 deletions

diff --git a/doc/src/snippets/code/src_network_access_qhttpmultipart.cpp b/doc/src/snippets/code/src_network_access_qhttpmultipart.cpp
new file mode 100644
index 0000000..9ad2222
--- /dev/null
+++ b/doc/src/snippets/code/src_network_access_qhttpmultipart.cpp
@@ -0,0 +1,67 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
+
+QHttpPart textPart;
+textPart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"text\""));
+textPart.setBody("my text");
+
+QHttpPart imagePart;
+imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/jpeg"));
+imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"image\""));
+QFile *file = new QFile("image.jpg");
+file->open(QIODevice::ReadOnly);
+imagePart.setBodyDevice(file);
+file->setParent(multiPart); // we cannot delete the file now, so delete it with the multiPart
+
+multiPart->append(textPart);
+multiPart->append(imagePart);
+
+QUrl url("http://my.server.tld");
+QNetworkRequest request(url);
+
+QNetworkAccessManager manager;
+QNetworkReply *reply = manager.post(request, multiPart);
+multiPart->setParent(reply); // delete the multiPart with the reply
+// here connect signals etc.
+//! [0]
diff --git a/doc/src/snippets/code/src_network_access_qhttppart.cpp b/doc/src/snippets/code/src_network_access_qhttppart.cpp
new file mode 100644
index 0000000..0e2dbea
--- /dev/null
+++ b/doc/src/snippets/code/src_network_access_qhttppart.cpp
@@ -0,0 +1,65 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+Content-Type: text/plain
+Content-Disposition: form-data; name="text"
+
+here goes the body
+//! [0]
+
+//! [1]
+QHttpPart textPart;
+textPart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("text/plain"));
+textPart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"text\""));
+textPart.setBody("here goes the body");
+//! [1]
+
+//! [2]
+QHttpPart imagePart;
+imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/jpeg"));
+imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"image\""));
+imagePart.setRawHeader("Content-ID", "my@content.id"); // add any headers you like via setRawHeader()
+QFile *file = new QFile("image.jpg");
+file->open(QIODevice::ReadOnly);
+imagePart.setBodyDevice(file);
+//! [2]
+