hurricane/security_camera/resources/cloud_server/functions/registerDevice.js - v4.1

const functions = require('firebase-functions');
const cors = require('cors')({origin: true})
const admin = require('firebase-admin');
const db = admin.firestore()
const uuid = require('uuid')
/*************************************************************************************************/
module.exports = functions.https.onRequest((req, res) => {
    cors(req, res, () => {});
    console.log('Received request: ' + JSON.stringify(req.body));
    if(!req.body.code) {
        return res.status(400).send('Missing code field');
    }
    let context = {
        device_code: req.body.code.trim().toUpperCase()
    }
    return retrieveDevice(context).then(() => {
        if(!context.deviceRef) {
            return res.status(404).send('Device not found');
        }
        return generateCustomToken(context)
    }).then((token) => {
        return res.status(200).send({token});
    }).catch((err) => {
        console.log(`Server error,${err.description || err.message || err}`)
        return res.status(500).send(`Server error,${err.description || err.message || err}`);
    })
})
/*************************************************************************************************/
const retrieveDevice = (context) => {
    const query = db.collection('devices').where('code', '==', context.device_code)
    return query.get().then((results) => {
        if (results.size > 0) {
            context.deviceRef = results.docs[0].ref
            context.uuid = results.docs[0].get('uuid')
        }
        return Promise.resolve()
    })
}
/*************************************************************************************************/
const generateCustomToken = function (context) {
    let uid = uuid.v4()
    let tokenInfo = {
        did: context.deviceRef.id,
        uuid: context.uuid
    }
    console.log(`Generating custom token: uid:${uid} did:${tokenInfo.did}, uuid:${tokenInfo.uuid}`)
    return admin.auth().createCustomToken(uid, tokenInfo)
        .catch((err) => {
            throw new Error(`Failed to generate token, err${err.description || err.message}`)
        });
}