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/**
 * Licensed to the University Corporation for Advanced Internet
 * Development, Inc. (UCAID) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.
 *
 * UCAID 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 */

/**
 * @file xmltooling/security/TrustEngine.h
 * 
 * Evaluates the trustworthiness and validity of security information against
 * implementation-specific requirements.
 */

#if !defined(__xmltooling_trust_h__) && !defined(XMLTOOLING_NO_XMLSEC)
#define __xmltooling_trust_h__

#include <xmltooling/base.h>
#include <xercesc/dom/DOM.hpp>

namespace xmltooling {

    class XMLTOOL_API KeyInfoResolver;

    /**
     * Evaluates the trustworthiness and validity of security information against
     * implementation-specific requirements.
     */
    class XMLTOOL_API TrustEngine {
        MAKE_NONCOPYABLE(TrustEngine);
    protected:
        /**
         * Constructor.
         * 
         * If a DOM is supplied, the following XML content is supported:
         * 
         * <ul>
         *  <li>&lt;KeyInfoResolver&gt; elements with a type attribute
         * </ul>
         * 
         * XML namespaces are ignored in the processing of this content.
         * 
         * @param e DOM to supply configuration for provider
         */
        TrustEngine(const xercesc::DOMElement* e=nullptr);
        
        /** Custom KeyInfoResolver instance. */
        KeyInfoResolver* m_keyInfoResolver;
        
    public:
        virtual ~TrustEngine();

        /**
         * Supplies a KeyInfoResolver instance.
         * <p>This method must be externally synchronized with any code that uses the object.
         * Any previously set object is destroyed.
         * 
         * @param keyInfoResolver   new KeyInfoResolver instance to use
         */
        void setKeyInfoResolver(KeyInfoResolver* keyInfoResolver);
    };

    /**
     * Registers TrustEngine classes into the runtime.
     */
    void XMLTOOL_API registerTrustEngines();

    /** TrustEngine based on explicit knowledge of peer key information. */
    #define EXPLICIT_KEY_TRUSTENGINE  "ExplicitKey"

    /** TrustEngine based on PKIX evaluation against a static set of trust anchors. */
    #define STATIC_PKIX_TRUSTENGINE  "StaticPKIX"

    /** TrustEngine that tries multiple engines in sequence. */
    #define CHAINING_TRUSTENGINE  "Chaining"
    
};

#endif /* __xmltooling_trust_h__ */