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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.kafka.common.requests;


import org.apache.kafka.common.message.SaslHandshakeRequestData;
import org.apache.kafka.common.message.SaslHandshakeResponseData;
import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.protocol.types.Struct;

import java.nio.ByteBuffer;

/**
 * Request from SASL client containing client SASL mechanism.
 * 
 * For interoperability with Kafka 0.9.0.x, the mechanism flow may be omitted when using GSSAPI. Hence
 * this request should not conflict with the first GSSAPI client packet. For GSSAPI, the first context
 * establishment packet starts with byte 0x60 (APPLICATION-0 tag) followed by a variable-length encoded size.
 * This handshake request starts with a request header two-byte API key set to 17, followed by a mechanism name,
 * making it easy to distinguish from a GSSAPI packet.
 */
public class SaslHandshakeRequest extends AbstractRequest {

    public static class Builder extends AbstractRequest.Builder {
        private final SaslHandshakeRequestData data;

        public Builder(SaslHandshakeRequestData data) {
            super(ApiKeys.SASL_HANDSHAKE);
            this.data = data;
        }

        @Override
        public SaslHandshakeRequest build(short version) {
            return new SaslHandshakeRequest(data, version);
        }

        @Override
        public String toString() {
            return data.toString();
        }
    }

    private final SaslHandshakeRequestData data;
    private final short version;

    public SaslHandshakeRequest(SaslHandshakeRequestData data) {
        this(data, ApiKeys.SASL_HANDSHAKE.latestVersion());
    }

    public SaslHandshakeRequest(SaslHandshakeRequestData data, short version) {
        super(ApiKeys.SASL_HANDSHAKE, version);
        this.data = data;
        this.version = version;
    }

    public SaslHandshakeRequest(Struct struct, short version) {
        super(ApiKeys.SASL_HANDSHAKE, version);
        this.data = new SaslHandshakeRequestData(struct, version);
        this.version = version;
    }

    public SaslHandshakeRequestData data() {
        return data;
    }

    @Override
    public AbstractResponse getErrorResponse(int throttleTimeMs, Throwable e) {
        SaslHandshakeResponseData response = new SaslHandshakeResponseData();
        response.setErrorCode(ApiError.fromThrowable(e).error().code());
        return new SaslHandshakeResponse(response);
    }

    public static SaslHandshakeRequest parse(ByteBuffer buffer, short version) {
        return new SaslHandshakeRequest(ApiKeys.SASL_HANDSHAKE.parseRequest(version, buffer), version);
    }

    @Override
    protected Struct toStruct() {
        return data.toStruct(version);
    }
}