Wake on LAN

server.js

const express = require('express')
const path = require('path')
const app = express()

const port = 3000
const password = '123456'
const default_mac = '00:AA:11:BB:22:CC'

const wake_on_lan = {
  ready: false,
  mac: null
}

app.use(express.json())
app.use(express.urlencoded({ extended: true }))

app.get('/', (req, res) => {
    if (req.query.password !== password) {
        return res.status(400).send('Bad Request')
    }

    wake_on_lan.ready = true
    wake_on_lan.mac = req.query.mac || null
    return res.send('ready')
})

app.get('/state', (req, res) => {
    res.json({
        wol: wake_on_lan.ready,
        mac: wake_on_lan.mac || default_mac
    })
})

app.post('/state', (req, res) => {
    if (req.body.password !== password) {
        return res.status(400).send('Bad Request')
    }

    console.log('result: ' + req.body.result)

    wake_on_lan.ready = false
    wake_on_lan.mac = null

    return res.send('ok')
})

app.listen(port, () => console.log(`Listening on port ${port}`))

wol.sh

#!/bin/bash

password=123456
endpoint=https://api.example.com

response=$(curl -s -X GET $endpoint/state)
wol=$(echo "$response" | jq '.wol')
mac=$(echo "$response" | jq '.mac' | sed -e 's/"//g')

if [ "$wol" == "true" ]; then
    result=$(/usr/bin/etherwake -D -i br-lan $mac)
    curl -s -X POST -H "Content-Type: application/json" -d "{\"result\": \"$result\", \"password\": \"$password\"}" $endpoint/state
fi