@seriousme/opifex/dist/server/handlers/handlePublish.js

MQTT client & server for Deno & NodeJS

import { SysPrefix } from "../context.js";
import { PacketType } from "../deps.js";
/**
 * Checks if a client is authorized to publish to a given topic
 * @param ctx - The connection context
 * @param topic - The topic to check authorization for
 * @returns boolean indicating if client is authorized to publish
 */
function authorizedToPublish(ctx, topic) {
    if (topic.startsWith(SysPrefix)) {
        return false;
    }
    if (ctx.handlers.isAuthorizedToPublish) {
        return ctx.handlers.isAuthorizedToPublish(ctx, topic);
    }
    return true;
}
/**
 * Handles MQTT PUBLISH packets
 * @param ctx - The connection context
 * @param packet - The PUBLISH packet to process
 * @returns Promise that resolves when packet is processed
 * @throws Error if packet processing fails
 */
export async function handlePublish(ctx, packet) {
    if (!authorizedToPublish(ctx, packet.topic)) {
        return;
    }
    const qos = packet.qos || 0;
    if (qos === 0) {
        ctx.persistence.publish(packet.topic, packet);
        return;
    }
    if (packet.id !== undefined) {
        // qos 1
        if (qos === 1) {
            const id = packet.id; // retain the id
            ctx.persistence.publish(packet.topic, packet);
            await ctx.send({
                type: PacketType.puback,
                id,
            });
            return;
        }
        // qos 2
        if (ctx.store) {
            ctx.store.pendingIncoming.set(packet.id, packet);
            await ctx.send({
                type: PacketType.pubrec,
                id: packet.id,
            });
        }
    }
}
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