/* -*- 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 <config_features.h>

#include <sfx2/docmacromode.hxx>
#include <sfx2/signaturestate.hxx>
#include <sfx2/docfile.hxx>

#include <com/sun/star/document/MacroExecMode.hpp>
#include <com/sun/star/task/ErrorCodeRequest.hpp>
#include <com/sun/star/task/DocumentMacroConfirmationRequest.hpp>
#include <com/sun/star/task/InteractionClassification.hpp>
#include <com/sun/star/security/DocumentDigitalSignatures.hpp>

#include <comphelper/processfactory.hxx>
#include <framework/interaction.hxx>
#include <osl/file.hxx>
#include <rtl/ref.hxx>
#include <unotools/securityoptions.hxx>
#include <svtools/sfxecode.hxx>
#include <tools/diagnose_ex.h>
#include <tools/urlobj.hxx>


namespace sfx2
{


    using ::com::sun::star::uno::Reference;
    using ::com::sun::star::task::XInteractionHandler;
    using ::com::sun::star::uno::Any;
    using ::com::sun::star::uno::Sequence;
    using ::com::sun::star::task::DocumentMacroConfirmationRequest;
    using ::com::sun::star::task::ErrorCodeRequest;
    using ::com::sun::star::uno::Exception;
    using ::com::sun::star::security::DocumentDigitalSignatures;
    using ::com::sun::star::security::XDocumentDigitalSignatures;
    using ::com::sun::star::embed::XStorage;
    using ::com::sun::star::document::XEmbeddedScripts;
    using ::com::sun::star::script::XLibraryContainer;
    using ::com::sun::star::container::XNameAccess;
    using ::com::sun::star::uno::UNO_QUERY_THROW;

    namespace MacroExecMode = ::com::sun::star::document::MacroExecMode;


    //= DocumentMacroMode_Data

    struct DocumentMacroMode_Data
    {
        IMacroDocumentAccess&       m_rDocumentAccess;
        bool                    m_bMacroDisabledMessageShown;
        bool                    m_bDocMacroDisabledMessageShown;

        explicit DocumentMacroMode_Data( IMacroDocumentAccess& rDocumentAccess )
            :m_rDocumentAccess( rDocumentAccess )
            ,m_bMacroDisabledMessageShown( false )
            ,m_bDocMacroDisabledMessageShown( false )
        {
        }
    };


    //= helper

    namespace
    {

        void lcl_showGeneralSfxErrorOnce( const Reference< XInteractionHandler >& rxHandler, ErrCode nSfxErrorCode, bool& rbAlreadyShown )
        {
            if ( rbAlreadyShown )
                return;

            ErrorCodeRequest aErrorCodeRequest;
            aErrorCodeRequest.ErrCode = sal_uInt32(nSfxErrorCode);

            SfxMedium::CallApproveHandler( rxHandler, makeAny( aErrorCodeRequest ), false );
            rbAlreadyShown = true;
        }


        void lcl_showMacrosDisabledError( const Reference< XInteractionHandler >& rxHandler, bool& rbAlreadyShown )
        {
            lcl_showGeneralSfxErrorOnce( rxHandler, ERRCODE_SFX_MACROS_SUPPORT_DISABLED, rbAlreadyShown );
        }


        void lcl_showDocumentMacrosDisabledError( const Reference< XInteractionHandler >& rxHandler, bool& rbAlreadyShown )
        {
#ifdef MACOSX
            lcl_showGeneralSfxErrorOnce( rxHandler, ERRCODE_SFX_DOCUMENT_MACRO_DISABLED_MAC, rbAlreadyShown );
#else
            lcl_showGeneralSfxErrorOnce( rxHandler, ERRCODE_SFX_DOCUMENT_MACRO_DISABLED, rbAlreadyShown );
#endif
        }

        void lcl_showMacrosDisabledUnsignedContentError( const Reference< XInteractionHandler >& rxHandler, bool& rbAlreadyShown )
        {
            lcl_showGeneralSfxErrorOnce( rxHandler, ERRCODE_SFX_DOCUMENT_MACRO_DISABLED, rbAlreadyShown );
        }

        bool lcl_showMacroWarning( const Reference< XInteractionHandler >& rxHandler,
            const OUString& rDocumentLocation )
        {
            DocumentMacroConfirmationRequest aRequest;
            aRequest.DocumentURL = rDocumentLocation;
            return SfxMedium::CallApproveHandler( rxHandler, makeAny( aRequest ), true );
        }
    }

    //= DocumentMacroMode
    DocumentMacroMode::DocumentMacroMode( IMacroDocumentAccess& rDocumentAccess )
        :m_xData( new DocumentMacroMode_Data( rDocumentAccess ) ),
        m_bNeedsContentSigned(false)
    {
    }

    bool DocumentMacroMode::allowMacroExecution()
    {
        m_xData->m_rDocumentAccess.setCurrentMacroExecMode( MacroExecMode::ALWAYS_EXECUTE_NO_WARN );
        return true;
    }

    bool DocumentMacroMode::disallowMacroExecution()
    {
        m_xData->m_rDocumentAccess.setCurrentMacroExecMode( MacroExecMode::NEVER_EXECUTE );
        return false;
    }

    bool DocumentMacroMode::adjustMacroMode( const Reference< XInteractionHandler >& rxInteraction, bool bHasValidContentSignature )
    {
        sal_uInt16 nMacroExecutionMode = m_xData->m_rDocumentAccess.getCurrentMacroExecMode();

        if ( SvtSecurityOptions().IsMacroDisabled() )
        {
            // no macro should be executed at all
            lcl_showMacrosDisabledError( rxInteraction, m_xData->m_bMacroDisabledMessageShown );
            return disallowMacroExecution();
        }

        // get setting from configuration if required
        enum AutoConfirmation
        {
            eNoAutoConfirm,
            eAutoConfirmApprove,
            eAutoConfirmReject
        };
        AutoConfirmation eAutoConfirm( eNoAutoConfirm );

        if  (   ( nMacroExecutionMode == MacroExecMode::USE_CONFIG )
            ||  ( nMacroExecutionMode == MacroExecMode::USE_CONFIG_REJECT_CONFIRMATION )
            ||  ( nMacroExecutionMode == MacroExecMode::USE_CONFIG_APPROVE_CONFIRMATION )
            )
        {
            SvtSecurityOptions aOpt;
            switch ( aOpt.GetMacroSecurityLevel() )
            {
                case 3:
                    nMacroExecutionMode = MacroExecMode::FROM_LIST_NO_WARN;
                    break;
                case 2:
                    nMacroExecutionMode = MacroExecMode::FROM_LIST_AND_SIGNED_WARN;
                    break;
                case 1:
                    nMacroExecutionMode = MacroExecMode::ALWAYS_EXECUTE;
                    break;
                case 0:
                    nMacroExecutionMode = MacroExecMode::ALWAYS_EXECUTE_NO_WARN;
                    break;
                default:
                    OSL_FAIL( "DocumentMacroMode::adjustMacroMode: unexpected macro security level!" );
                    nMacroExecutionMode = MacroExecMode::NEVER_EXECUTE;
            }

            if ( nMacroExecutionMode == MacroExecMode::USE_CONFIG_REJECT_CONFIRMATION )
                eAutoConfirm = eAutoConfirmReject;
            else if ( nMacroExecutionMode == MacroExecMode::USE_CONFIG_APPROVE_CONFIRMATION )
                eAutoConfirm = eAutoConfirmApprove;
        }

        if ( nMacroExecutionMode == MacroExecMode::NEVER_EXECUTE )
            return false;

        if ( nMacroExecutionMode == MacroExecMode::ALWAYS_EXECUTE_NO_WARN )
            return true;

        try
        {
            // get document location from medium name and check whether it is a trusted one
            // the service is created without document version, since it is not of interest here
            Reference< XDocumentDigitalSignatures > xSignatures(DocumentDigitalSignatures::createDefault(::comphelper::getProcessComponentContext()));
            INetURLObject aURLReferer( m_xData->m_rDocumentAccess.getDocumentLocation() );

            OUString aLocation;
            if ( aURLReferer.removeSegment() )
                aLocation = aURLReferer.GetMainURL( INetURLObject::DecodeMechanism::NONE );

            if ( !aLocation.isEmpty() && xSignatures->isLocationTrusted( aLocation ) )
            {
                return allowMacroExecution();
            }

            // at this point it is clear that the document is not in the secure location
            if ( nMacroExecutionMode == MacroExecMode::FROM_LIST_NO_WARN )
            {
                lcl_showDocumentMacrosDisabledError( rxInteraction, m_xData->m_bDocMacroDisabledMessageShown );
                return disallowMacroExecution();
            }

            // check whether the document is signed with trusted certificate
            if ( nMacroExecutionMode != MacroExecMode::FROM_LIST )
            {
                // the trusted macro check will also retrieve the signature state ( small optimization )
                const SvtSecurityOptions aSecOption;
                const bool bAllowUIToAddAuthor = nMacroExecutionMode != MacroExecMode::FROM_LIST_AND_SIGNED_NO_WARN
                                                 && (nMacroExecutionMode == MacroExecMode::ALWAYS_EXECUTE
                                                     || !aSecOption.IsReadOnly(SvtSecurityOptions::EOption::MacroTrustedAuthors));
                const bool bHasTrustedMacroSignature = m_xData->m_rDocumentAccess.hasTrustedScriptingSignature(bAllowUIToAddAuthor);

                SignatureState nSignatureState = m_xData->m_rDocumentAccess.getScriptingSignatureState();
                if ( nSignatureState == SignatureState::BROKEN )
                {
                    if (!bAllowUIToAddAuthor)
                        lcl_showDocumentMacrosDisabledError(rxInteraction, m_xData->m_bDocMacroDisabledMessageShown);
                    return disallowMacroExecution();
                }
                else if ( m_xData->m_rDocumentAccess.macroCallsSeenWhileLoading() &&
                          bHasTrustedMacroSignature &&
                          !bHasValidContentSignature)
                {
                    // When macros are signed, and the document has events which call macros, the document content needs to be signed too.
                    lcl_showMacrosDisabledUnsignedContentError(rxInteraction, m_xData->m_bDocMacroDisabledMessageShown);
                    return disallowMacroExecution();
                }
                else if ( bHasTrustedMacroSignature )
                {
                    // there is trusted macro signature, allow macro execution
                    return allowMacroExecution();
                }
                else if ( nSignatureState == SignatureState::OK
                       || nSignatureState == SignatureState::NOTVALIDATED )
                {
                    // there is valid signature, but it is not from the trusted author
                    if (!bAllowUIToAddAuthor)
                        lcl_showDocumentMacrosDisabledError(rxInteraction, m_xData->m_bDocMacroDisabledMessageShown);
                    return disallowMacroExecution();
                }
            }

            // at this point it is clear that the document is neither in secure location nor signed with trusted certificate
            if  (   ( nMacroExecutionMode == MacroExecMode::FROM_LIST_AND_SIGNED_NO_WARN )
                ||  ( nMacroExecutionMode == MacroExecMode::FROM_LIST_AND_SIGNED_WARN )
                )
            {
                if  ( nMacroExecutionMode == MacroExecMode::FROM_LIST_AND_SIGNED_WARN )
                    lcl_showDocumentMacrosDisabledError( rxInteraction, m_xData->m_bDocMacroDisabledMessageShown );

                return disallowMacroExecution();
            }
        }
        catch ( const Exception& )
        {
            if  (   ( nMacroExecutionMode == MacroExecMode::FROM_LIST_NO_WARN )
                ||  ( nMacroExecutionMode == MacroExecMode::FROM_LIST_AND_SIGNED_WARN )
                ||  ( nMacroExecutionMode == MacroExecMode::FROM_LIST_AND_SIGNED_NO_WARN )
                )
            {
                return disallowMacroExecution();
            }
        }

        // conformation is required
        bool bSecure = false;

        if ( eAutoConfirm == eNoAutoConfirm )
        {
            OUString sReferrer( m_xData->m_rDocumentAccess.getDocumentLocation() );

            OUString aSystemFileURL;
            if ( osl::FileBase::getSystemPathFromFileURL( sReferrer, aSystemFileURL ) == osl::FileBase::E_None )
                sReferrer = aSystemFileURL;

            bSecure = lcl_showMacroWarning( rxInteraction, sReferrer );
        }
        else
            bSecure = ( eAutoConfirm == eAutoConfirmApprove );

        return ( bSecure ? allowMacroExecution() : disallowMacroExecution() );
    }


    bool DocumentMacroMode::isMacroExecutionDisallowed() const
    {
        return m_xData->m_rDocumentAccess.getCurrentMacroExecMode() == MacroExecMode::NEVER_EXECUTE;
    }


    bool DocumentMacroMode::containerHasBasicMacros( const Reference< XLibraryContainer >& xContainer )
    {
        bool bHasMacroLib = false;
        try
        {
            if ( xContainer.is() )
            {
                // a library container exists; check if it's empty

                // if there are libraries except the "Standard" library
                // we assume that they are not empty (because they have been created by the user)
                if ( !xContainer->hasElements() )
                    bHasMacroLib = false;
                else
                {
                    const OUString aStdLibName( "Standard" );
                    const OUString aVBAProject( "VBAProject" );
                    Sequence< OUString > aElements = xContainer->getElementNames();
                    if ( aElements.getLength() )
                    {
                        sal_Int32 nElements = aElements.getLength();
                        for( sal_Int32 i = 0; i < nElements; ++i )
                        {
                            const OUString aElement = aElements[i];
                            if( aElement == aStdLibName || aElement == aVBAProject )
                            {
                                Reference < XNameAccess > xLib;
                                Any aAny = xContainer->getByName( aElement );
                                aAny >>= xLib;
                                if ( xLib.is() && xLib->hasElements() )
                                    return true;
                            }
                            else
                                return true;
                        }
                    }
                }
            }
        }
        catch( const Exception& )
        {
            DBG_UNHANDLED_EXCEPTION("sfx.doc");
        }
        return bHasMacroLib;
    }


    bool DocumentMacroMode::hasMacroLibrary() const
    {
        bool bHasMacroLib = false;
#if HAVE_FEATURE_SCRIPTING
        try
        {
            Reference< XEmbeddedScripts > xScripts( m_xData->m_rDocumentAccess.getEmbeddedDocumentScripts() );
            Reference< XLibraryContainer > xContainer;
            if ( xScripts.is() )
                xContainer.set( xScripts->getBasicLibraries(), UNO_QUERY_THROW );
            bHasMacroLib = containerHasBasicMacros( xContainer );

        }
        catch( const Exception& )
        {
            DBG_UNHANDLED_EXCEPTION("sfx.doc");
        }
#endif
        return bHasMacroLib;
    }


    bool DocumentMacroMode::storageHasMacros( const Reference< XStorage >& rxStorage )
    {
        bool bHasMacros = false;
        if ( rxStorage.is() )
        {
            try
            {
                const OUString s_sBasicStorageName( OUString::intern( RTL_CONSTASCII_USTRINGPARAM( "Basic" ) ) );
                const OUString s_sScriptsStorageName( OUString::intern( RTL_CONSTASCII_USTRINGPARAM( "Scripts" ) ) );

                bHasMacros =(   (   rxStorage->hasByName( s_sBasicStorageName )
                                &&  rxStorage->isStorageElement( s_sBasicStorageName )
                                )
                            ||  (   rxStorage->hasByName( s_sScriptsStorageName )
                                &&  rxStorage->isStorageElement( s_sScriptsStorageName )
                                )
                            );
            }
            catch ( const Exception& )
            {
                DBG_UNHANDLED_EXCEPTION("sfx.doc");
            }
        }
        return bHasMacros;
    }


    bool DocumentMacroMode::checkMacrosOnLoading( const Reference< XInteractionHandler >& rxInteraction, bool bHasValidContentSignature )
    {
        bool bAllow = false;
        if ( SvtSecurityOptions().IsMacroDisabled() )
        {
            // no macro should be executed at all
            bAllow = disallowMacroExecution();
        }
        else
        {
            if (m_xData->m_rDocumentAccess.documentStorageHasMacros() || hasMacroLibrary() || m_xData->m_rDocumentAccess.macroCallsSeenWhileLoading())
            {
                if (m_xData->m_rDocumentAccess.macroCallsSeenWhileLoading())
                    m_bNeedsContentSigned = true;
                bAllow = adjustMacroMode( rxInteraction, bHasValidContentSignature );
            }
            else if ( !isMacroExecutionDisallowed() )
            {
                // if macros will be added by the user later, the security check is obsolete
                bAllow = allowMacroExecution();
            }
        }
        return bAllow;
    }


} // namespace sfx2


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