libreoffice/comphelper/source/misc/docpasswordhelper.cxx

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_comphelper.hxx"

#include "comphelper/docpasswordhelper.hxx"
#include <com/sun/star/task/XInteractionHandler.hpp>
#include "comphelper/mediadescriptor.hxx"

using ::rtl::OUString;
using ::com::sun::star::uno::Sequence;
using ::com::sun::star::uno::Exception;
using ::com::sun::star::uno::Reference;
using ::com::sun::star::uno::UNO_SET_THROW;
using ::com::sun::star::task::PasswordRequestMode;
using ::com::sun::star::task::PasswordRequestMode_PASSWORD_ENTER;
using ::com::sun::star::task::PasswordRequestMode_PASSWORD_REENTER;
using ::com::sun::star::task::XInteractionHandler;
using ::com::sun::star::task::XInteractionRequest;

namespace comphelper {

// ============================================================================

IDocPasswordVerifier::~IDocPasswordVerifier()
{
}

// ============================================================================
sal_uInt16 DocPasswordHelper::GetXLHashAsUINT16(
                const ::rtl::OUString& aUString,
                rtl_TextEncoding nEnc )
{
    sal_uInt16 nResult = 0;

    ::rtl::OString aString = ::rtl::OUStringToOString( aUString, nEnc );

    if ( aString.getLength() && aString.getLength() <= SAL_MAX_UINT16 )
    {
        for ( sal_Int32 nInd = aString.getLength() - 1; nInd >= 0; nInd-- )
        {
            nResult = ( ( nResult >> 14 ) & 0x01 ) | ( ( nResult << 1 ) & 0x7FFF );
            nResult ^= aString.getStr()[nInd];
        }

        nResult = ( ( nResult >> 14 ) & 0x01 ) | ( ( nResult << 1 ) & 0x7FFF );
        nResult ^= ( 0x8000 | ( 'N' << 8 ) | 'K' );
        nResult ^= aString.getLength();
    }

    return nResult;
}

// ============================================================================
Sequence< sal_Int8 > DocPasswordHelper::GetXLHashAsSequence(
                const ::rtl::OUString& aUString,
                rtl_TextEncoding nEnc )
{
    sal_uInt16 nHash = GetXLHashAsUINT16( aUString, nEnc );
    Sequence< sal_Int8 > aResult( 2 );
    aResult[0] = ( nHash >> 8 );
    aResult[1] = ( nHash & 0xFF );

    return aResult;
}

// ============================================================================

/*static*/ OUString DocPasswordHelper::requestAndVerifyDocPassword(
        IDocPasswordVerifier& rVerifier,
        const OUString& rMediaPassword,
        const Reference< XInteractionHandler >& rxInteractHandler,
        const OUString& rDocumentName,
        DocPasswordRequestType eRequestType,
        const ::std::vector< OUString >* pDefaultPasswords,
        bool* pbIsDefaultPassword )
{
    OUString aPassword;
    DocPasswordVerifierResult eResult = DocPasswordVerifierResult_WRONG_PASSWORD;

    // first, try provided default passwords
    if( pbIsDefaultPassword )
        *pbIsDefaultPassword = false;
    if( pDefaultPasswords )
    {
        for( ::std::vector< OUString >::const_iterator aIt = pDefaultPasswords->begin(), aEnd = pDefaultPasswords->end(); (eResult == DocPasswordVerifierResult_WRONG_PASSWORD) && (aIt != aEnd); ++aIt )
        {
            aPassword = *aIt;
            OSL_ENSURE( aPassword.getLength() > 0, "DocPasswordHelper::requestAndVerifyDocPassword - unexpected empty default password" );
            if( aPassword.getLength() > 0 )
            {
                eResult = rVerifier.verifyPassword( aPassword );
                if( pbIsDefaultPassword )
                    *pbIsDefaultPassword = eResult == DocPasswordVerifierResult_OK;
            }
        }
    }

    // try media password (skip, if result is OK or ABORT)
    if( eResult == DocPasswordVerifierResult_WRONG_PASSWORD )
    {
        aPassword = rMediaPassword;
        if( aPassword.getLength() > 0 )
            eResult = rVerifier.verifyPassword( aPassword );
    }

    // request a password (skip, if result is OK or ABORT)
    if( (eResult == DocPasswordVerifierResult_WRONG_PASSWORD) && rxInteractHandler.is() ) try
    {
        PasswordRequestMode eRequestMode = PasswordRequestMode_PASSWORD_ENTER;
        while( eResult == DocPasswordVerifierResult_WRONG_PASSWORD )
        {
            DocPasswordRequest* pRequest = new DocPasswordRequest( eRequestType, eRequestMode, rDocumentName );
            Reference< XInteractionRequest > xRequest( pRequest );
            rxInteractHandler->handle( xRequest );
            if( pRequest->isPassword() )
            {
                aPassword = pRequest->getPassword();
                if( aPassword.getLength() > 0 )
                    eResult = rVerifier.verifyPassword( aPassword );
            }
            else
            {
                eResult = DocPasswordVerifierResult_ABORT;
            }
            eRequestMode = PasswordRequestMode_PASSWORD_REENTER;
        }
    }
    catch( Exception& )
    {
    }

    return (eResult == DocPasswordVerifierResult_OK) ? aPassword : OUString();
}

/*static*/ OUString DocPasswordHelper::requestAndVerifyDocPassword(
        IDocPasswordVerifier& rVerifier,
        MediaDescriptor& rMediaDesc,
        DocPasswordRequestType eRequestType,
        const ::std::vector< OUString >* pDefaultPasswords )
{
    OUString aMediaPassword = rMediaDesc.getUnpackedValueOrDefault(
        MediaDescriptor::PROP_PASSWORD(), OUString() );
    Reference< XInteractionHandler > xInteractHandler = rMediaDesc.getUnpackedValueOrDefault(
        MediaDescriptor::PROP_INTERACTIONHANDLER(), Reference< XInteractionHandler >() );
    OUString aDocumentName = rMediaDesc.getUnpackedValueOrDefault(
        MediaDescriptor::PROP_URL(), OUString() );

    bool bIsDefaultPassword = false;
    OUString aPassword = requestAndVerifyDocPassword(
        rVerifier, aMediaPassword, xInteractHandler, aDocumentName, eRequestType, pDefaultPasswords, &bIsDefaultPassword );

    // insert valid password into media descriptor (but not a default password)
    if( (aPassword.getLength() > 0) && !bIsDefaultPassword )
        rMediaDesc[ MediaDescriptor::PROP_PASSWORD() ] <<= aPassword;

    return aPassword;
}

// ============================================================================

} // namespace comphelper