/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtNetwork module of the Qt Toolkit.
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** No Commercial Usage
** This file contains pre-release code and may not be distributed.
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** 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.
**
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** 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.
**
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** $QT_END_LICENSE$
**
****************************************************************************/

#include "qnetworkaccessdatabackend_p.h"
#include "qnetworkrequest.h"
#include "qnetworkreply.h"
#include "qurlinfo.h"

QT_BEGIN_NAMESPACE

QNetworkAccessBackend *
QNetworkAccessDataBackendFactory::create(QNetworkAccessManager::Operation,
                                         const QNetworkRequest &request) const
{
    if (request.url().scheme() == QLatin1String("data"))
        return new QNetworkAccessDataBackend;

    return 0;
}

QNetworkAccessDataBackend::QNetworkAccessDataBackend()
{
}

QNetworkAccessDataBackend::~QNetworkAccessDataBackend()
{
}

void QNetworkAccessDataBackend::open()
{
    QUrl uri = request().url();

    if (operation() != QNetworkAccessManager::GetOperation &&
        operation() != QNetworkAccessManager::HeadOperation) {
        // data: doesn't support anything but GET
        QString msg = QObject::tr("Operation not supported on %1")
                      .arg(uri.toString());
        error(QNetworkReply::ContentOperationNotPermittedError, msg);
        finished();
        return;
    }

    if (uri.host().isEmpty()) {
        setHeader(QNetworkRequest::ContentTypeHeader, QLatin1String("text/plain;charset=US-ASCII"));

        // the following would have been the correct thing, but
        // reality often differs from the specification. People have
        // data: URIs with ? and #
        //QByteArray data = QByteArray::fromPercentEncoding(uri.encodedPath());
        QByteArray data = QByteArray::fromPercentEncoding(uri.toEncoded());

        // remove the data: scheme
        data.remove(0, 5);

        // parse it:
        int pos = data.indexOf(',');
        if (pos != -1) {
            QByteArray payload = data.mid(pos + 1);
            data.truncate(pos);
            data = data.trimmed();

            // find out if the payload is encoded in Base64
            if (data.endsWith(";base64")) {
                payload = QByteArray::fromBase64(payload);
                data.chop(7);
            }

            if (data.toLower().startsWith("charset")) {
                int i = 7;      // strlen("charset")
                while (data.at(i) == ' ')
                    ++i;
                if (data.at(i) == '=')
                    data.prepend("text/plain;");
            }

            if (!data.isEmpty())
                setHeader(QNetworkRequest::ContentTypeHeader, data.trimmed());

            setHeader(QNetworkRequest::ContentLengthHeader, payload.size());
            emit metaDataChanged();

            QByteDataBuffer list;
            list.append(payload);
            payload.clear(); // important because of implicit sharing!
            writeDownstreamData(list);

            finished();
            return;
        }
    }

    // something wrong with this URI
    QString msg = QObject::tr("Invalid URI: %1").arg(uri.toString());
    error(QNetworkReply::ProtocolFailure, msg);
    finished();
}

void QNetworkAccessDataBackend::closeDownstreamChannel()
{
}

void QNetworkAccessDataBackend::closeUpstreamChannel()
{
}

bool QNetworkAccessDataBackend::waitForDownstreamReadyRead(int)
{
    return false;
}

bool QNetworkAccessDataBackend::waitForUpstreamBytesWritten(int)
{
    return false;
}

QT_END_NAMESPACE