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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/CredentialResolver.h
 * 
 * An API for resolving keys and certificates based on application criteria.
 */

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

#include <xmltooling/Lockable.h>

namespace xmltooling {

    class XMLTOOL_API Credential;
    class XMLTOOL_API CredentialCriteria;

    /**
     * An API for resolving keys and certificates based on application criteria.
     */
    class XMLTOOL_API CredentialResolver : public virtual Lockable
    {
        MAKE_NONCOPYABLE(CredentialResolver);
    protected:
        CredentialResolver();
        
    public:
        virtual ~CredentialResolver();
        
        /**
         * Returns a single Credential according to the supplied criteria.
         * 
         * @param criteria   an optional CredentialCriteria object 
         * @return  a Credential, or nullptr if none could be found
         */
        virtual const Credential* resolve(const CredentialCriteria* criteria=nullptr) const=0;

        /**
         * Returns all matching Credentials according to the supplied criteria.
         * 
         * @param results   array to store matching Credentials
         * @param criteria  an optional CredentialCriteria object 
         * @return  number of credentials found
         */
        virtual std::vector<const Credential*>::size_type resolve(
            std::vector<const Credential*>& results, const CredentialCriteria* criteria=nullptr
            ) const=0;
    };

    /**
     * Registers CredentialResolver classes into the runtime.
     */
    void XMLTOOL_API registerCredentialResolvers();

    /** CredentialResolver based on local files with no criteria support. */
    #define FILESYSTEM_CREDENTIAL_RESOLVER  "File"

    /** CredentialResolver based on chaining together other resolvers. */
    #define CHAINING_CREDENTIAL_RESOLVER    "Chaining"
};

#endif /* __xmltooling_credres_h__ */