intval3/lib/ble/index.js

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'use strict'
/** @module ble */
/** Bluetooth Low Energy module */
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const os = require('os')
const bleno = require('bleno')
const util = require('util')
const log = require('../log')('ble')
const wifi = require('../wifi')
const BLENO_DEVICE_NAME = process.env.BLENO_DEVICE_NAME || 'intval3'
const DEVICE_ID = process.env.DEVICE_ID || 'intval3'
const SERVICE_ID = process.env.SERVICE_ID || 'intval3_ble'
const CHAR_ID = process.env.CHAR_ID || 'intval3char'
const WIFI_ID = process.env.WIFI_ID || 'wifichar'
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const NETWORK = os.networkInterfaces()
const MAC = getMac() || spoofMac()
let currentWifi = 'disconnected'
const chars = []
function createChar(name, uuid, prop, write, read) {
function characteristic () {
bleno.Characteristic.call(this, {
uuid : uuid,
properties: prop
})
}
util.inherits(characteristic, bleno.Characteristic)
if (prop.indexOf('read') !== -1) {
//data, offset, withoutResponse, callback
characteristic.prototype.onReadRequest = read
}
if (prop.indexOf('write') !== -1) {
characteristic.prototype.onWriteRequest = write
}
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chars.push(new characteristic())
}
function createChars (onWrite, onRead) {
createChar('intval3', CHAR_ID, ['read', 'write'], onWrite, onRead)
createChar('wifi', WIFI_ID, ['read', 'write'], onWifiWrite, onWifiRead)
}
function onWifiWrite (data, offset, withoutResponse, callback) {
let result
let utf8
let obj
let ssid
let pwd
if (offset) {
log.warn(`Offset scenario`)
result = bleno.Characteristic.RESULT_ATTR_NOT_LONG
return callback(result)
}
utf8 = data.toString('utf8')
obj = JSON.parse(utf8)
ssid = obj.ssid
pwd = obj.pwd
log.info(`connecting to AP`, { ssid : ssid })
return wifi.setNetwork(ssid, pwd, (err, data) => {
if (err) {
log.error('Error configuring wifi', err)
result = bleno.Characteristic.RESULT_UNLIKELY_ERROR
return callback(result)
}
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currentWifi = ssid
log.info(`Connected to AP`, { ssid : ssid })
result = bleno.Characteristic.RESULT_SUCCESS
return callback(result)
})
}
function onWifiRead (offset, callback) {
const result = bleno.Characteristic.RESULT_SUCCESS
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const data = new Buffer(JSON.stringify(currentWifi))
callback(result, data.slice(offset, data.length))
}
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function getMac () {
const colonRe = new RegExp(':', 'g')
if (NETWORK && NETWORK.wlan0 && NETWORK.wlan0[0] && NETWORK.wlan0[0].mac) {
return NETWORK.wlan0[0].mac.replace(colonRe, '')
}
return undefined
}
function spoofMac () {
const fs = require('fs')
const FSPATH = require.resolve('uuid')
const IDFILE = os.homedir() + '/.intval3id'
let uuid
let UUIDPATH
let TMP
let MACTMP
let dashRe
delete require.cache[FSPATH]
if (fs.existsSync(IDFILE)) {
return fs.readFileSync(IDFILE, 'utf8')
}
uuid = require('uuid').v4
UUIDPATH = require.resolve('uuid')
delete require.cache[UUIDPATH]
TMP = uuid()
MACTMP = TMP.replace(dashRe, '').substring(0, 12)
dashRe = new RegExp('-', 'g')
fs.writeFileSync(IDFILE, MACTMP, 'utf8')
return MACTMP
}
function capitalize (s) {
return s[0].toUpperCase() + s.slice(1)
}
/** Class representing the bluetooth interface */
class BLE {
/**
* Establishes Bluetooth Low Energy services, accessible to process through this class
*
* @constructor
*/
constructor () {
log.info('Starting bluetooth service')
bleno.on('stateChange', state => {
const BLE_ID = `${DEVICE_ID}_${MAC}`
log.info('stateChange', { state : state })
if (state === 'poweredOn') {
log.info('Starting advertising', { BLE_ID : BLE_ID })
bleno.startAdvertising(BLENO_DEVICE_NAME, [BLE_ID])
} else {
bleno.stopAdvertising()
}
})
bleno.on('advertisingStart', err => {
log.info('advertisingStart', { res : (err ? 'error ' + err : 'success') })
createChars(this._onWrite.bind(this), this._onRead.bind(this))
if (!err) {
bleno.setServices([
new bleno.PrimaryService({
uuid : SERVICE_ID, //hardcoded across panels
characteristics : chars
})
])
}
})
bleno.on('accept', clientAddress => {
log.info('accept', { clientAddress : clientAddress })
})
bleno.on('disconnect', clientAddress => {
log.info('disconnect', { clientAddress : clientAddress })
})
}
_onWrite (data, offset, withoutResponse, callback) {
let result
let utf8
let obj
if (offset) {
log.warn(`Offset scenario`)
result = bleno.Characteristic.RESULT_ATTR_NOT_LONG
return callback(result)
}
utf8 = data.toString('utf8')
obj = JSON.parse(utf8)
console.dir(obj)
result = bleno.Characteristic.RESULT_SUCCESS
return callback(result)
}
_onRead (offset, callback) {
const result = bleno.Characteristic.RESULT_SUCCESS
const data = new Buffer(JSON.stringify( { success : true } ))
callback(result, data.slice(offset, data.length))
}
/**
* Binds functions to events that are triggered by BLE messages
*
* @param {string} eventName Name of the event to to bind
* @param {function} callback Invoked when the event is triggered
*/
on (eventName, callback) {
this[`_on${capitalize(eventName)}`] = callback
}
}
module.exports = new BLE()