xmlsecurity/source/framework/encryptionengine.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include "encryptionengine.hxx"
  22 #include <com/sun/star/xml/crypto/XMLEncryptionTemplate.hpp>
  23 #include <com/sun/star/xml/wrapper/XXMLElementWrapper.hpp>
  24 #include <com/sun/star/lang/XMultiServiceFactory.hpp>
  25
  26 using namespace com::sun::star::uno;
  27 namespace cssxc = com::sun::star::xml::crypto;
  28 namespace cssxw = com::sun::star::xml::wrapper;
  29
  30 EncryptionEngine::EncryptionEngine( const Reference<XComponentContext> & xContext)
  31         :m_xContext(xContext), m_nIdOfBlocker(-1)
  32 {
  33 }
  34
  35 bool EncryptionEngine::checkReady() const
  36 /****** EncryptionEngine/checkReady ******************************************
  37  *
  38  *   NAME
  39  *  checkReady -- checks the conditions for the main operation.
  40  *
  41  *   SYNOPSIS
  42  *  bReady = checkReady( );
  43  *
  44  *   FUNCTION
  45  *  checks whether all following conditions are satisfied:
  46  *  1. the main operation has't begun yet;
  47  *  2. the key material is known;
  48  *  3. the id of the template blocker is known;
  49  *  4. both the key element and the encryption template
  50  *     are bufferred.
  51  *
  52  *   INPUTS
  53  *  empty
  54  *
  55  *   RESULT
  56  *  bReady - true if all conditions are satisfied, false otherwise
  57  *
  58  *   AUTHOR
  59  *  Michael Mi
  60  *  Email: michael.mi@sun.com
  61  ******************************************************************************/
  62 {
  63     bool rc = true;
  64
  65     sal_Int32 nKeyInc = 0;
  66     if (m_nIdOfKeyEC != 0)
  67     {
  68         nKeyInc = 1;
  69     }
  70
  71     if (m_bMissionDone ||
  72         m_nIdOfKeyEC == -1 ||
  73         m_nIdOfBlocker == -1 ||
  74         1+nKeyInc > m_nNumOfResolvedReferences )
  75     {
  76         rc = false;
  77     }
  78
  79     return rc;
  80 }
  81
  82 void EncryptionEngine::tryToPerform( )
  83         throw (Exception, RuntimeException)
  84 /****** EncryptionEngine/tryToPerform ****************************************
  85  *
  86  *   NAME
  87  *  tryToPerform -- tries to perform the encryption/decryption operation.
  88  *
  89  *   SYNOPSIS
  90  *  tryToPerform( );
  91  *
  92  *   FUNCTION
  93  *  if the situation is ready, perform following operations.
  94  *  1. prepares a encryption template;
  95  *  2. calls the encryption bridge component;
  96  *  3. clears up all used resources;
  97  *  4. notifies the result listener;
  98  *  5. sets the "accomplishment" flag.
  99  *
 100  *   INPUTS
 101  *  empty
 102  *
 103  *   RESULT
 104  *  empty
 105  *
 106  *   AUTHOR
 107  *  Michael Mi
 108  *  Email: michael.mi@sun.com
 109  ******************************************************************************/
 110 {
 111     if (checkReady())
 112     {
 113         Reference < cssxc::XXMLEncryptionTemplate > xEncryptionTemplate =
 114             cssxc::XMLEncryptionTemplate::create( m_xContext );
 115
 116         Reference< cssxw::XXMLElementWrapper > xXMLElement
 117             = m_xSAXEventKeeper->getElement( m_nIdOfTemplateEC );
 118
 119         xEncryptionTemplate->setTemplate(xXMLElement);
 120
 121         startEngine( xEncryptionTemplate );
 122
 123         /*
 124          * done
 125          */
 126         clearUp( );
 127
 128         notifyResultListener();
 129
 130         m_bMissionDone = true;
 131     }
 132 }
 133
 134 void EncryptionEngine::clearUp( ) const
 135 /****** EncryptionEngine/clearup *********************************************
 136  *
 137  *   NAME
 138  *  clearUp -- clear up all resources used by this operation.
 139  *
 140  *   SYNOPSIS
 141  *  clearUp( );
 142  *
 143  *   FUNCTION
 144  *  cleaning resources up includes:
 145  *  1. releases the ElementCollector for the encryption template element;
 146  *  2. releases the Blocker for the encryption template element;
 147  *  3. releases the ElementCollector for the key element, if there is one.
 148  *
 149  *   INPUTS
 150  *  empty
 151  *
 152  *   RESULT
 153  *  empty
 154  *
 155  *   AUTHOR
 156  *  Michael Mi
 157  *  Email: michael.mi@sun.com
 158  ******************************************************************************/
 159 {
 160     Reference < cssxc::sax::XReferenceResolvedBroadcaster >
 161         xReferenceResolvedBroadcaster( m_xSAXEventKeeper, UNO_QUERY );
 162
 163     xReferenceResolvedBroadcaster->removeReferenceResolvedListener(
 164         m_nIdOfTemplateEC,
 165         static_cast<const Reference < cssxc::sax::XReferenceResolvedListener > >((SecurityEngine *)this));
 166
 167     m_xSAXEventKeeper->removeElementCollector(m_nIdOfTemplateEC);
 168
 169     if (m_nIdOfBlocker != -1)
 170     {
 171         m_xSAXEventKeeper->removeBlocker(m_nIdOfBlocker);
 172     }
 173
 174     if (m_nIdOfKeyEC != 0 && m_nIdOfKeyEC != -1)
 175     {
 176         m_xSAXEventKeeper->removeElementCollector(m_nIdOfKeyEC);
 177     }
 178 }
 179
 180 /* XBlockerMonitor */
 181 void SAL_CALL EncryptionEngine::setBlockerId( sal_Int32 id )
 182     throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException, std::exception)
 183 {
 184     m_nIdOfBlocker = id;
 185     tryToPerform();
 186 }
 187
 188 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */