@seriousme/opifex/dist/mqttPacket/publish.js

MQTT client & server for Deno & NodeJS

import { PacketType } from "./PacketType.js";
import { BitMask } from "./BitMask.js";
import { Encoder, EncoderError } from "./encoder.js";
import { booleanFlag, Decoder, DecoderError } from "./decoder.js";
export const publish = {
    encode(packet) {
        const qos = packet.qos || 0;
        const flags = (packet.dup ? BitMask.bit3 : 0) +
            (qos & 2 ? BitMask.bit2 : 0) +
            (qos & 1 ? BitMask.bit1 : 0) +
            (packet.retain ? BitMask.bit0 : 0);
        const encoder = new Encoder();
        encoder.setTopic(packet.topic);
        if (qos === 1 || qos === 2) {
            if (typeof packet.id !== "number" || packet.id < 1) {
                throw new EncoderError("when qos is 1 or 2, packet must have id");
            }
            encoder.setInt16(packet.id);
        }
        encoder.setRemainder(packet.payload);
        return { flags, bytes: encoder.done() };
    },
    decode(buffer, flags) {
        const dup = booleanFlag(flags, BitMask.bit3);
        const qos = (flags & 6) >> 1;
        const retain = booleanFlag(flags, BitMask.bit0);
        if (qos !== 0 && qos !== 1 && qos !== 2) {
            throw new DecoderError("Invalid qos");
        }
        if (dup && qos === 0) {
            throw new DecoderError("Invalid qos for possible duplicate");
        }
        const decoder = new Decoder(buffer);
        const topic = decoder.getTopic();
        let id = 0;
        if (qos > 0) {
            id = decoder.getInt16();
        }
        const payload = decoder.getRemainder();
        // no decoder.done() required because of getRemainder
        return {
            type: PacketType.publish,
            topic,
            payload,
            dup,
            retain,
            qos,
            id,
        };
    },
};
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