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Java implementation of CoAP protocol
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/*
 * Copyright (C) 2022-2024 java-coap contributors (https://github.com/open-coap/java-coap)
 * SPDX-License-Identifier: Apache-2.0
 * 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
 *
 * 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.opencoap.coap.netty;

import static java.util.Objects.requireNonNull;
import com.mbed.coap.packet.CoapPacket;
import com.mbed.coap.packet.CoapSerializer;
import com.mbed.coap.transport.TransportContext;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufInputStream;
import io.netty.buffer.ByteBufOutputStream;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.socket.DatagramPacket;
import io.netty.handler.codec.MessageToMessageCodec;
import java.util.List;
import java.util.function.BiFunction;
import java.util.function.Function;

@Sharable
public class CoapCodec extends MessageToMessageCodec {

    private final Function contextResolver;
    private final BiFunction coapToDatagramConverter;

    public static final Function EMPTY_RESOLVER = __ -> TransportContext.EMPTY;
    public static final BiFunction DEFAULT_CONVERTER = (coapPacket, ctx) -> {
        ByteBuf buf = ctx.alloc().buffer(coapPacket.getPayload().size() + 128);
        CoapSerializer.serialize(coapPacket, new ByteBufOutputStream(buf));
        return new DatagramPacket(buf, coapPacket.getRemoteAddress());
    };

    public CoapCodec(Function contextResolver) {
        this(contextResolver, DEFAULT_CONVERTER);
    }

    public CoapCodec(Function contextResolver, BiFunction coapToDatagramConverter) {
        this.contextResolver = requireNonNull(contextResolver);
        this.coapToDatagramConverter = requireNonNull(coapToDatagramConverter);
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, DatagramPacket msg, List