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import crypto from 'crypto'
import { MqttClient } from 'mqtt'
import { EagleStatus } from './eagle.js'
import { SnowStatus } from './snow.js'
import type { Config, SnowListener, EagleListener } from './types.js'
import { Command } from './types.js'
export class Topic {
constructor(
public readonly unknown1: boolean,
public readonly unknown2: boolean,
public readonly unknown3: boolean,
public readonly unknown4: boolean,
public readonly deviceId: number
) {
//
}
static parse(topic: string) {
const components = topic.split('/')
if (components.length !== 7) {
throw new Error('The topic format is expected to be airmx/+/+/+/+/+/+.')
}
if (components[0] !== 'airmx') {
throw new Error('The 1st part of the topic must be "airmx".')
}
if (components[1] !== '01') {
throw new Error('The 2nd part of the topic must be "01".')
}
for (let i = 2; i < 6; i++) {
if (components[i] !== '0' && components[i] !== '1') {
const ordinal = `${i + 1}${(i + 1) === 3 ? 'rd' : 'th'}`
throw new Error(`The ${ordinal} part of the topic must be either "1" or "0".`)
}
}
const deviceId = components[6]
if (deviceId === '' || ! /^\d+$/.test(deviceId)) {
throw new Error('The 7th part of the topic must be a device ID.')
}
return new this(
components[2] === '1',
components[3] === '1',
components[4] === '1',
components[5] === '1',
+deviceId
)
}
}
export class Airmx {
#listeners: {
eagle: EagleListener[],
snow: SnowListener[]
} = {
eagle: [],
snow: []
}
#client: MqttClient
constructor(
private readonly config: Config
) {
this.#client = this.config.mqtt
this.#client.on('connect', this.#handleConnect.bind(this))
this.#client.on('message', this.#handleMessage.bind(this))
}
onSnowUpdate(callback: SnowListener) {
this.#listeners.snow.push(callback)
return this
}
onEagleUpdate(callback: EagleListener) {
this.#listeners.eagle.push(callback)
return this
}
#handleConnect() {
this.#client.subscribe('airmx/01/+/+/1/1/+')
}
#handleMessage(topic: string, message: Buffer): void {
let t: Topic
try {
t = Topic.parse(topic)
} catch (e) {
return
}
const str = message.toString()
const data = JSON.parse(str)
this.#validateMessage(t.deviceId, str, data.sig)
switch (data.cmdId) {
case Command.SnowStatus:
this.#notifySnow(SnowStatus.from(t.deviceId, data))
break
case Command.EagleStatus:
this.#notifyEagle(EagleStatus.from(t.deviceId, data))
break
}
}
#notifySnow(status: SnowStatus) {
this.#listeners.snow.forEach((listener) => listener(status))
}
#notifyEagle(status: EagleStatus) {
this.#listeners.eagle.forEach((listener) => listener(status))
}
#validateMessage(deviceId: number, message: string, sig: string) {
const device = this.config.devices.find((device) => device.id === deviceId)
if (device === undefined) {
throw new Error(`Could not find the device with ID ${deviceId}.`)
}
const plainText = message.slice(1, message.lastIndexOf('"sig"'))
const calculated = crypto.createHash('md5')
.update(plainText)
.update(device.key)
.digest('hex')
if (calculated !== sig) {
throw new Error('Failed to validate the message.')
}
}
}
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