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Reactive Relational Database Connectivity Driver Implementation for Postgresql
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/*
 * Copyright 2017 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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 io.r2dbc.postgresql.message.frontend;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.r2dbc.postgresql.util.Assert;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Mono;
import reactor.util.annotation.Nullable;

import java.nio.ByteBuffer;
import java.util.Objects;

import static io.r2dbc.postgresql.message.frontend.FrontendMessageUtils.writeByte;
import static io.r2dbc.postgresql.message.frontend.FrontendMessageUtils.writeBytes;
import static io.r2dbc.postgresql.message.frontend.FrontendMessageUtils.writeCStringUTF8;
import static io.r2dbc.postgresql.message.frontend.FrontendMessageUtils.writeInt;
import static io.r2dbc.postgresql.message.frontend.FrontendMessageUtils.writeLengthPlaceholder;
import static io.r2dbc.postgresql.message.frontend.FrontendMessageUtils.writeSize;

/**
 * The SASLInitialResponse Message.
 */
public final class SASLInitialResponse implements FrontendMessage {

    private final ByteBuffer initialResponse;

    private final String name;

    /**
     * Create a new message.
     *
     * @param initialResponse SASL mechanism specific "Initial Response"
     * @param name            name of the SASL authentication mechanism that the client selected
     * @throws IllegalArgumentException if {@code name} is {@code null}
     */
    public SASLInitialResponse(@Nullable ByteBuffer initialResponse, String name) {
        if (initialResponse == null) {
            this.initialResponse = null;
        } else {
            initialResponse.flip();
            this.initialResponse = initialResponse;
        }
        this.name = Assert.requireNonNull(name, "name must not be null");
    }

    @Override
    public Publisher encode(ByteBufAllocator byteBufAllocator) {
        Assert.requireNonNull(byteBufAllocator, "byteBufAllocator must not be null");

        return Mono.fromSupplier(() -> {
            ByteBuf out = byteBufAllocator.ioBuffer();

            writeByte(out, 'p');
            writeLengthPlaceholder(out);
            writeCStringUTF8(out, this.name);

            if (this.initialResponse == null) {
                writeInt(out, -1);
            } else {
                writeInt(out, this.initialResponse.remaining());
                writeBytes(out, this.initialResponse);
            }

            return writeSize(out);
        });
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        SASLInitialResponse that = (SASLInitialResponse) o;
        return Objects.equals(this.initialResponse, that.initialResponse) &&
            Objects.equals(this.name, that.name);
    }

    @Override
    public int hashCode() {
        return Objects.hash(this.initialResponse, this.name);
    }

    @Override
    public String toString() {
        return "SASLInitialResponse{" +
            "initialResponse=" + initialResponse +
            ", name='" + name + '\'' +
            '}';
    }

}