Quelle xmlstreamio.cxx Sprache: C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
*   Licensed to the Apache Software Foundation (ASF) under one or more
*   contributor license agreements. See the NOTICE file distributed
*   with this work for additional information regarding copyright
*   ownership. The ASF licenses this file to you under the Apache
*   License, Version 2.0 (the "License"); you may not use this file
*   except in compliance with the License. You may obtain a copy of
*   the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/

#include <sal/config.h>

#include <xmlsec/io.h>

/*
* Implementation of the I/O interfaces based on stream and URI binding
*/
#include <xmlsec/xmlstreamio.hxx>
#include <xmlsec/errorcallback.hxx>
#include <rtl/ustring.hxx>
#include <rtl/uri.hxx>
#include <comphelper/scopeguard.hxx>
#include <sal/log.hxx>

#include <com/sun/star/xml/crypto/XUriBinding.hpp>

static bool g_bInputCallbacksEnabled = false;
static bool g_bInputCallbacksRegistered = false;

static css::uno::Reference< css::xml::crypto::XUriBinding > m_xUriBinding ;

extern "C" {

static int xmlStreamMatch( const char* uri )
{
    css::uno::Reference< css::io::XInputStream > xInputStream ;

    if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
    {
        if( uri == nullptr || !m_xUriBinding.is() )
            return 0 ;
        //XMLSec first unescapes the uri and  calls this function. For example, we pass the Uri
        //ObjectReplacements/Object%201 then XMLSec passes ObjectReplacements/Object 1
        //first. If this failed it would try this
        //again with the original escaped string. However, it does not get this far, because there
        //is another callback registered by libxml which claims to be able to handle this uri.
        OUString sUri =
            ::rtl::Uri::encode( OUString::createFromAscii( uri ),
            rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
        xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
        if (!xInputStream.is())
        {
            //Try the passed in uri directly.
            //For old documents prior OOo 3.0. We did not use URIs then.
            xInputStream = m_xUriBinding->getUriBinding(
                OUString::createFromAscii(uri));
        }
    }
    SAL_INFO("xmlsecurity.xmlsec",
             "xmlStreamMath: uri is '" << uri << "', returning " << xInputStream.is());
    if (xInputStream.is())
        return 1;
    else
        return 0 ;
}

static void* xmlStreamOpen( const char* uri )
{
    css::uno::Reference< css::io::XInputStream > xInputStream ;

    if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
    {
        if( uri == nullptr || !m_xUriBinding.is() )
            return nullptr ;

        //see xmlStreamMatch
        OUString sUri =
            ::rtl::Uri::encode( OUString::createFromAscii( uri ),
            rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
        xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
        if (!xInputStream.is())
        {
            //For old documents.
            //try the passed in uri directly.
            xInputStream = m_xUriBinding->getUriBinding(
                OUString::createFromAscii(uri));
        }

        if( xInputStream.is() ) {
            css::io::XInputStream* pInputStream ;
            pInputStream = xInputStream.get() ;
            pInputStream->acquire() ;
            SAL_INFO("xmlsecurity.xmlsec",
                     "xmlStreamOpen: uri is '" << uri << "', returning context " << pInputStream);
            return static_cast<void*>(pInputStream) ;
        }
    }

    return nullptr ;
}

static int xmlStreamRead( void* context, char* buffer, int len )
{
    int numbers ;
    css::uno::Reference< css::io::XInputStream > xInputStream ;
    css::uno::Sequence< sal_Int8 > outSeqs( len ) ;

    numbers = 0 ;
    if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
    {
        if( context != nullptr ) {
            xInputStream = static_cast<css::io::XInputStream*>(context);
            if( !xInputStream.is() )
                return 0 ;

            numbers = xInputStream->readBytes( outSeqs, len ) ;
            const sal_Int8* readBytes = outSeqs.getArray() ;
            for( int i = 0 ; i < numbers ; i ++ )
                *( buffer + i ) = *( readBytes + i ) ;
        }
    }

    SAL_INFO("xmlsecurity.xmlsec", "xmlStreamRead: context is " << context << ", buffer is now '"
                                                         << OString(buffer, numbers) << "'");
    return numbers ;
}

static int xmlStreamClose( void * context )
{
    if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
    {
        if( context != nullptr ) {
            css::io::XInputStream* pInputStream ;
            pInputStream = static_cast<css::io::XInputStream*>(context);
            pInputStream->release() ;
            SAL_INFO("xmlsecurity.xmlsec", "xmlStreamRead: closed context " << context);
        }
    }

    return 0 ;
}

}

int xmlEnableStreamInputCallbacks()
{
    if (!g_bInputCallbacksEnabled)
    {
        //Register the callbacks into xmlSec
        //In order to make the xmlsec io finding the callbacks firstly,
        //I put the callbacks at the very beginning.

        //Cleanup the older callbacks.
        //Notes: all none default callbacks will lose.
        xmlSecIOCleanupCallbacks() ;

        // Make sure that errors are reported via SAL_WARN().
        setErrorRecorder();
        comphelper::ScopeGuard g([] { clearErrorRecorder(); });

        // Newer xmlsec wants the callback order in the opposite direction.
        if (xmlSecCheckVersionExt(1, 2, 26, xmlSecCheckVersionABICompatible))
        {
            //Register the default callbacks.
            //Notes: the error will cause xmlsec working problems.
            int cbs = xmlSecIORegisterDefaultCallbacks() ;
            if( cbs < 0 ) {
                return -1 ;
            }

            //Register my classbacks.
            cbs = xmlSecIORegisterCallbacks(
                        xmlStreamMatch,
                        xmlStreamOpen,
                        xmlStreamRead,
                        xmlStreamClose ) ;
            if( cbs < 0 ) {
                return -1 ;
            }
        }
        else
        {
            //Register my classbacks.
            int cbs = xmlSecIORegisterCallbacks(
                        xmlStreamMatch,
                        xmlStreamOpen,
                        xmlStreamRead,
                        xmlStreamClose ) ;
            if( cbs < 0 ) {
                return -1 ;
            }

            //Register the default callbacks.
            //Notes: the error will cause xmlsec working problems.
            cbs = xmlSecIORegisterDefaultCallbacks() ;
            if( cbs < 0 ) {
                return -1 ;
            }
        }

        g_bInputCallbacksEnabled = true;
    }

    return 0 ;
}

int xmlRegisterStreamInputCallbacks(
    css::uno::Reference< css::xml::crypto::XUriBinding > const & aUriBinding
) {
    if (!g_bInputCallbacksEnabled)
    {
        if( xmlEnableStreamInputCallbacks() < 0 )
            return -1 ;
    }

    if (!g_bInputCallbacksRegistered)
        g_bInputCallbacksRegistered = true;

    m_xUriBinding = aUriBinding ;

    return 0 ;
}

int xmlUnregisterStreamInputCallbacks()
{
    if (g_bInputCallbacksRegistered)
    {
        //Clear the uri-stream binding
        m_xUriBinding.clear() ;

        //disable the registered flag
        g_bInputCallbacksRegistered = false;
    }

    return 0 ;
}

void xmlDisableStreamInputCallbacks() {
    xmlUnregisterStreamInputCallbacks() ;
    g_bInputCallbacksEnabled = false;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

quality98%

¤ Dauer der Verarbeitung: 0.4 Sekunden ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.