kafka ScramMechanism 源码

2022-10-20
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kafka ScramMechanism 代码

文件路径：/clients/src/main/java/org/apache/kafka/clients/admin/ScramMechanism.java

/*
 * 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.kafka.clients.admin;

import java.util.Arrays;

/**
 * Representation of a SASL/SCRAM Mechanism.
 *
 * @see <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-554%3A+Add+Broker-side+SCRAM+Config+API">KIP-554: Add Broker-side SCRAM Config API</a>
 */
public enum ScramMechanism {
    UNKNOWN((byte) 0),
    SCRAM_SHA_256((byte) 1),
    SCRAM_SHA_512((byte) 2);

    private static final ScramMechanism[] VALUES = values();

    /**
     *
     * @param type the type indicator
     * @return the instance corresponding to the given type indicator, otherwise {@link #UNKNOWN}
     */
    public static ScramMechanism fromType(byte type) {
        for (ScramMechanism scramMechanism : VALUES) {
            if (scramMechanism.type == type) {
                return scramMechanism;
            }
        }
        return UNKNOWN;
    }

    /**
     *
     * @param mechanismName the SASL SCRAM mechanism name
     * @return the corresponding SASL SCRAM mechanism enum, otherwise {@link #UNKNOWN}
     * @see <a href="https://tools.ietf.org/html/rfc5802#section-4">
     *     Salted Challenge Response Authentication Mechanism (SCRAM) SASL and GSS-API Mechanisms, Section 4</a>
     */
    public static ScramMechanism fromMechanismName(String mechanismName) {
        return Arrays.stream(VALUES)
            .filter(mechanism -> mechanism.mechanismName.equals(mechanismName))
            .findFirst()
            .orElse(UNKNOWN);
    }

    /**
     *
     * @return the corresponding SASL SCRAM mechanism name
     * @see <a href="https://tools.ietf.org/html/rfc5802#section-4">
     *     Salted Challenge Response Authentication Mechanism (SCRAM) SASL and GSS-API Mechanisms, Section 4</a>
     */
    public String mechanismName() {
        return this.mechanismName;
    }

    /**
     *
     * @return the type indicator for this SASL SCRAM mechanism
     */
    public byte type() {
        return this.type;
    }

    private final byte type;
    private final String mechanismName;

    private ScramMechanism(byte type) {
        this.type = type;
        this.mechanismName = toString().replace('_', '-');
    }
}

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