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| -rw-r--r-- | xmlsecurity/inc/framework/saxeventkeeperimpl.hxx | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/xmlsecurity/inc/framework/saxeventkeeperimpl.hxx b/xmlsecurity/inc/framework/saxeventkeeperimpl.hxx new file mode 100644 index 000000000..e3edb8579 --- /dev/null +++ b/xmlsecurity/inc/framework/saxeventkeeperimpl.hxx @@ -0,0 +1,294 @@ +/* -*- 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 . + */ + +#ifndef INCLUDED_XMLSECURITY_INC_FRAMEWORK_SAXEVENTKEEPERIMPL_HXX +#define INCLUDED_XMLSECURITY_INC_FRAMEWORK_SAXEVENTKEEPERIMPL_HXX + +#include <com/sun/star/xml/crypto/sax/XSecuritySAXEventKeeper.hpp> +#include <com/sun/star/xml/crypto/sax/XReferenceResolvedBroadcaster.hpp> +#include <com/sun/star/xml/crypto/sax/XSAXEventKeeperStatusChangeBroadcaster.hpp> +#include <com/sun/star/xml/sax/XDocumentHandler.hpp> +#include <com/sun/star/lang/XInitialization.hpp> +#include <com/sun/star/lang/XServiceInfo.hpp> +#include <xmlsecuritydllapi.h> +#include <cppuhelper/implbase.hxx> + +class BufferNode; +class ElementMark; +class ElementCollector; + +#include <vector> +#include <memory> + +namespace com::sun::star::xml::crypto::sax { class XSAXEventKeeperStatusChangeListener; } +namespace com::sun::star::xml::csax { class XCompressedDocumentHandler; } +namespace com::sun::star::xml::wrapper { class XXMLDocumentWrapper; } + +class SAXEventKeeperImpl final : public cppu::WeakImplHelper +< + css::xml::crypto::sax::XSecuritySAXEventKeeper, + css::xml::crypto::sax::XReferenceResolvedBroadcaster, + css::xml::crypto::sax::XSAXEventKeeperStatusChangeBroadcaster, + css::xml::sax::XDocumentHandler, + css::lang::XInitialization, + css::lang::XServiceInfo +> +/****** SAXEventKeeperImpl.hxx/CLASS SAXEventKeeperImpl *********************** + * + * NAME + * SAXEventKeeperImpl -- SAX events buffer controller + * + * FUNCTION + * Controls SAX events to be buffered, and controls buffered SAX events + * to be released. + ******************************************************************************/ +{ +private: + /* + * the XMLDocumentWrapper component which maintains all buffered SAX + * in DOM format. + */ + css::uno::Reference< css::xml::wrapper::XXMLDocumentWrapper > + m_xXMLDocument; + + /* + * the document handler provided by the XMLDocumentWrapper component. + */ + css::uno::Reference< css::xml::sax::XDocumentHandler > m_xDocumentHandler; + + /* + * the compressed document handler provided by the XMLDocumentWrapper + * component, the handler has more efficient method definition that the + * normal document handler. + */ + css::uno::Reference< css::xml::csax::XCompressedDocumentHandler > + m_xCompressedDocumentHandler; + + /* + * a listener which receives this SAXEventKeeper's status change + * notification. + * Based on the status changes, the listener can decide whether the + * SAXEventKeeper should chain on/chain off the SAX chain, or whether + * the SAXEventKeeper is useless any long. + */ + css::uno::Reference< css::xml::crypto::sax::XSAXEventKeeperStatusChangeListener > + m_xSAXEventKeeperStatusChangeListener; + + /* + * the root node of the BufferNode tree. + * the BufferNode tree is used to keep track of all buffered elements, + * it has the same structure with the document which maintains those + * elements physically. + */ + std::unique_ptr<BufferNode> m_pRootBufferNode; + + /* + * the current active BufferNode. + * this is used to keep track the current location in the BufferNode tree, + * the next generated BufferNode will become a child BufferNode of it. + */ + BufferNode* m_pCurrentBufferNode; + + /* + * the next Id for a coming ElementMark. + * the variable is increased by 1 when a new ElementMark is generated, + * in this way, we can promise the Id of any ElementMark is unique. + */ + sal_Int32 m_nNextElementMarkId; + + /* + * maintains a collection of all ElementMarks. + */ + std::vector<std::unique_ptr<const ElementMark>> m_vElementMarkBuffers; + + /* + * maintains a list of new ElementCollectors that will be created + * on the element represented by the next incoming startElement SAX + * event. + * The reason that such the m_vNewElementCollectors is necessary + * is: when an ElementCollector is asked to create, it can't be + * created completely at once, because the BufferNode it will be + * working on has not been created until the next startElement + * SAX event comes. + */ + std::vector< const ElementCollector* > m_vNewElementCollectors; + + /* + * maintains the new Blocker that will be created + * on the element represented by the next incoming startElement SAX + * event. + */ + ElementMark* m_pNewBlocker; + + /* + * the document handler to which all received SAX events will be + * forwarded. + */ + css::uno::Reference< css::xml::sax::XDocumentHandler > m_xNextHandler; + + /* + * the current BufferNode which prevents the SAX events to be + * forwarded to the m_xNextHandler. + */ + BufferNode* m_pCurrentBlockingBufferNode; + + /* + * maintains a list of ElementMark that has been asked to release. + * Because during processing a request of releasing an ElementMark, + * another releasing ElementMark request can be invoked. To avoid + * reentering the same method, a such request only add that ElementMark + * into this ElementMark list, then all ElementMarks will be processed in + * order. + */ + std::vector< sal_Int32 > m_vReleasedElementMarkBuffers; + + /* + * a flag to indicate whether the ElementMark releasing process is running. + * When a releasing request comes, the assigned ElementMark is added to + * the m_vReleasedElementMarkBuffers first, then this flag is checked. + * If the ElementMark releasing process is not running, then call that + * method. + */ + bool m_bIsReleasing; + + /* + * a flag to indicate whether it is the "Forwarding" mode now. + * A "Forwarding" mode means that all received SAX events are from the + * XMLDocumentWrapper component, instead of up-stream component in the + * SAX chain. + * The difference between "Forwarding" mode and normal mode is that: + * no SAX events need to be transferred to the XMLDocumentWrapper component + * again even if a buffer request happens. + */ + bool m_bIsForwarding; + + void setCurrentBufferNode(BufferNode* pBufferNode); + + BufferNode* addNewElementMarkBuffers(); + + ElementMark* findElementMarkBuffer(sal_Int32 nId) const; + + void removeElementMarkBuffer(sal_Int32 nId); + + OUString printBufferNode( + BufferNode const * pBufferNode, sal_Int32 nIndent) const; + + static css::uno::Sequence< css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > > + collectChildWorkingElement(BufferNode const * pBufferNode); + + void smashBufferNode( + BufferNode* pBufferNode, bool bClearRoot) const; + + static BufferNode* findNextBlockingBufferNode( + BufferNode* pStartBufferNode); + + static void diffuse(BufferNode* pBufferNode); + + void releaseElementMarkBuffer(); + + void markElementMarkBuffer(sal_Int32 nId); + + sal_Int32 createElementCollector( + css::xml::crypto::sax::ElementMarkPriority nPriority, + bool bModifyElement, + const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener>& xReferenceResolvedListener); + + sal_Int32 createBlocker(); + +public: + SAXEventKeeperImpl(); + virtual ~SAXEventKeeperImpl() override; + + SAXEventKeeperImpl(const SAXEventKeeperImpl&) = delete; + SAXEventKeeperImpl& operator=(const SAXEventKeeperImpl&) = delete; + + /* XSAXEventKeeper */ + virtual sal_Int32 SAL_CALL addElementCollector( ) override; + virtual void SAL_CALL removeElementCollector( sal_Int32 id ) override; + virtual sal_Int32 SAL_CALL addBlocker( ) override; + virtual void SAL_CALL removeBlocker( sal_Int32 id ) override; + virtual sal_Bool SAL_CALL isBlocking( ) override; + virtual css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > SAL_CALL + getElement( sal_Int32 id ) override; + virtual void SAL_CALL setElement( + sal_Int32 id, + const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& aElement ) override; + virtual css::uno::Reference< + css::xml::sax::XDocumentHandler > SAL_CALL + setNextHandler( const css::uno::Reference< + css::xml::sax::XDocumentHandler >& xNewHandler ) override; + virtual OUString SAL_CALL printBufferNodeTree() override; + virtual css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > SAL_CALL + getCurrentBlockingNode() override; + + /* XSecuritySAXEventKeeper */ + virtual sal_Int32 SAL_CALL addSecurityElementCollector( + css::xml::crypto::sax::ElementMarkPriority priority, + sal_Bool modifyElement ) override; + virtual void SAL_CALL setSecurityId( sal_Int32 id, sal_Int32 securityId ) override; + + /* XReferenceResolvedBroadcaster */ + virtual void SAL_CALL addReferenceResolvedListener( + sal_Int32 referenceId, + const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& listener ) override; + virtual void SAL_CALL removeReferenceResolvedListener( + sal_Int32 referenceId, + const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& listener ) override; + + /* XSAXEventKeeperStatusChangeBroadcaster */ + virtual void SAL_CALL addSAXEventKeeperStatusChangeListener( + const css::uno::Reference< css::xml::crypto::sax::XSAXEventKeeperStatusChangeListener >& listener ) override; + virtual void SAL_CALL removeSAXEventKeeperStatusChangeListener( + const css::uno::Reference< css::xml::crypto::sax::XSAXEventKeeperStatusChangeListener >& listener ) override; + + /* XDocumentHandler */ + virtual void SAL_CALL startDocument( ) override; + virtual void SAL_CALL endDocument( ) override; + virtual void SAL_CALL startElement( + const OUString& aName, + const css::uno::Reference< css::xml::sax::XAttributeList >& + xAttribs ) override; + virtual void SAL_CALL endElement( const OUString& aName ) override; + virtual void SAL_CALL characters( const OUString& aChars ) override; + virtual void SAL_CALL ignorableWhitespace( const OUString& aWhitespaces ) override; + virtual void SAL_CALL processingInstruction( + const OUString& aTarget, const OUString& aData ) override; + virtual void SAL_CALL setDocumentLocator( + const css::uno::Reference< css::xml::sax::XLocator >& xLocator ) override; + + /* XInitialization */ + virtual void SAL_CALL initialize( + const css::uno::Sequence< css::uno::Any >& aArguments ) override; + + /* XServiceInfo */ + virtual OUString SAL_CALL getImplementationName( ) override; + virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override; + virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames( ) override; +}; + +/// @throws css::uno::RuntimeException +OUString SAXEventKeeperImpl_getImplementationName(); + +/// @throws css::uno::RuntimeException +css::uno::Sequence< OUString > SAXEventKeeperImpl_getSupportedServiceNames( ); + +#endif + + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |