tray.js

const Client = require('node-rest-client').Client
const { app, BrowserWindow, Menu, dialog, shell, Tray } = require('electron')

var client = new Client()

/**
 * Calls a home assistant service
 * @param {*} hass
 * @param {*} password
 * @param {*} domain
 * @param {*} service
 * @param {*} entity_id
 */
function hassService(hass, password, domain, service, entity_id) {
    client.post(`${hass}/api/services/${domain}/${service}`,
        { headers: { 'x-ha-access': password, 'Content-Type': 'application/json' }, data: { entity_id: entity_id, } },
        (data, res) => { })
}

/**
 * get single domain and create best label
 * @param {*} states
 * @param {*} domain
 * @param {*} sensor if true, label contains state and unit
 */
function filterDomain(states, domain, sensor = false) {
    return states
        .filter(state => state.entity_id.startsWith(domain + '.'))
        .map(item => {
            let label = item.attributes.friendly_name
            if (!label) {
                label = item.entity_id
            }
            if (sensor) {
                label += ': ' + item.state
            }
            if (item.attributes.unit_of_measurement) {
                label += item.attributes.unit_of_measurement
            }
            item.label = label
            return item
        })
}

function createTray(hass, password) {
    let tray = new Tray('assets/tray.png')

    client.get(hass + `/api/states?api_password=${password}`, (data, res) => {

        if (data instanceof Buffer) {
            dialog.showErrorBox('Tray error', `Unable to connect to ${hass}/apis/states?api_password=${password}`)
            return
        }

        let switches = filterDomain(data, 'switch').map(item => {
            return {
                label: item.label,
                click() { hassService(hass, password, 'switch', 'toggle', item.entity_id) }
            }
        })

        let lights = filterDomain(data, 'light').map(item => {
            return {
                label: item.label,
                click() { hassService(hass, password, 'light', 'toggle', item.entity_id) }
            }
        })

        let scenes = filterDomain(data, 'scene').map(item => {
            return {
                label: item.label,
                click() { hassService(hass, password, 'scene', 'turn_on', item.entity_id) }
            }
        })

        let sensors = filterDomain(data, 'sensor', true).map(item => {
            return { label: item.label, enabled: false }
        })

        let bins = filterDomain(data, 'binary_sensor', true).map(item => {
            return { label: item.label, enabled: false }
        })

        let items = [
            ...sensors,
            ...bins,
            { label: 'Switches', submenu: switches },
            { label: 'Lights', submenu: lights },
            { label: 'Scenes', submenu: scenes }
        ]

        let menu = Menu.buildFromTemplate(items)
        tray.setContextMenu(menu)
    })
}


module.exports = createTray