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
 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.
/**
 *  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
 *
 *  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.
 */
package javax.security.auth.message.callback;

import java.math.BigInteger;
import java.security.PrivateKey;
import java.security.cert.Certificate;

import javax.security.auth.callback.Callback;
import javax.security.auth.x500.X500Principal;

Callback that enables an authentication module to request a certificate chain
and private key from the runtime. The information specifying the chain and
key may be an alias, a digest, a subject key, or an issuer ID. Other request
types may be supported.
/**
 * Callback that enables an authentication module to request a certificate chain
 * and private key from the runtime. The information specifying the chain and
 * key may be an alias, a digest, a subject key, or an issuer ID. Other request
 * types may be supported.
 */
public class PrivateKeyCallback implements Callback {

    private final Request request;
    private Certificate[] chain;
    private PrivateKey key;

    public PrivateKeyCallback(Request request) {
        this.request = request;
    }

    public Request getRequest() {
        return request;
    }

    public void setKey(PrivateKey key, Certificate[] chain) {
        this.key = key;
        this.chain = chain;
    }

    public PrivateKey getKey() {
        return key;
    }

    public Certificate[] getChain() {
        return chain;
    }

    public static interface Request {
    }

    public static class AliasRequest implements Request {

        private final String alias;

        public AliasRequest(String alias) {
            this.alias = alias;
        }

        public String getAlias() {
            return alias;
        }
    }

    public static class DigestRequest implements Request {
        private final byte[] digest;
        private final String algorithm;

        public DigestRequest(byte[] digest, String algorithm) {
            this.digest = digest;
            this.algorithm = algorithm;
        }

        public byte[] getDigest() {
            return digest;
        }

        public String getAlgorithm() {
            return algorithm;
        }
    }

    public static class SubjectKeyIDRequest implements Request {

        private final byte[] subjectKeyID;

        public SubjectKeyIDRequest(byte[] subjectKeyID) {
            this.subjectKeyID = subjectKeyID;
        }

        public byte[] getSubjectKeyID() {
            return subjectKeyID;
        }
    }

    public static class IssuerSerialNumRequest implements Request {
        private final X500Principal issuer;
        private final BigInteger serialNum;

        public IssuerSerialNumRequest(X500Principal issuer, BigInteger serialNum) {
            this.issuer = issuer;
            this.serialNum = serialNum;
        }

        public X500Principal getIssuer() {
            return issuer;
        }

        public BigInteger getSerialNum() {
            return serialNum;
        }
    }
}