org.apache.sshd.common.config.keys.PublicKeyEntryDataResolver Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * 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 org.apache.sshd.common.config.keys;

import java.util.Base64;

import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.NumberUtils;

/**
 * TODO Add javadoc
 *
 * @author Apache MINA SSHD Project
 */
public interface PublicKeyEntryDataResolver {
    PublicKeyEntryDataResolver DEFAULT = new PublicKeyEntryDataResolver() {
        @Override
        public String toString() {
            return "DEFAULT";
        }
    };

    /**
     * Decodes the public key entry data bytes from their string representation - by default it assume {@link Base64}
     * encoding.
     *
     * @param  encData The encoded data - ignored if {@code null}/empty
     * @return         The decoded data bytes
     */
    default byte[] decodeEntryKeyData(String encData) {
        if (GenericUtils.isEmpty(encData)) {
            return GenericUtils.EMPTY_BYTE_ARRAY;
        }

        Base64.Decoder decoder = Base64.getDecoder();
        return decoder.decode(encData);
    }

    /**
     * Encodes the public key entry data bytes into their string representation - by default it assume {@link Base64}
     * encoding.
     *
     * @param  keyData The key data bytes - ignored if {@code null}/empty
     * @return         The encoded data bytes
     */
    default String encodeEntryKeyData(byte[] keyData) {
        if (NumberUtils.isEmpty(keyData)) {
            return "";
        }

        Base64.Encoder encoder = Base64.getEncoder();
        return encoder.encodeToString(keyData);
    }
}