index.js

var jwt = require("jsonwebtoken")
var http2 = require("http2")

const ALGORITHM = "ES256"
const APNS_KEY_ID = "YOUR_APNS_KEY_ID"
const TEAM_ID = "YOUR_TEAM_ID"
const BUNDLE_ID = "YOUR_BUNDLE_ID"
const REGISTRATION_ID = "YOUR_DEVICE_PUSH_TOKEN"

const CERT =
    "-----BEGIN PRIVATE KEY-----\n\
    -----END PRIVATE KEY-----"

// subscribe is the main function called by Cloud Functions.
module.exports.statusSubscribe = (event, callback) => {
    const build = eventToBuild(event.data.data)

    // Skip if the current status is not in the status list.
    // Add additional statues to list if you'd like:
    // QUEUED, WORKING, SUCCESS, FAILURE,
    // INTERNAL_ERROR, TIMEOUT, CANCELLED
    const status = ["SUCCESS", "FAILURE", "INTERNAL_ERROR", "TIMEOUT"]
    if (status.indexOf(build.status) === -1) {
        return callback()
    }

    const payload = { aps: { alert: `${build.status}` } }

    const token = jwt.sign({ iss: TEAM_ID, iat: Math.floor(Date.now() / 1000) - 1 }, CERT, {
        algorithm: ALGORITHM,
        header: { alg: ALGORITHM, kid: APNS_KEY_ID }
    })

    const path = `/3/device/${REGISTRATION_ID}`

    const options = {}
    options.host = "api.development.push.apple.com"
    options.port = 443
    options.method = "POST"
    options.path = path
    options.headers = {}
    options.headers["apns-expiration"] = "0"
    options.headers["apns-priority"] = "10"
    options.headers["apns-topic"] = BUNDLE_ID
    options.headers["authorization"] = `bearer ${token}`

    const req = http2.request(options, res => {
        let data = []
        res.on("data", chunks => {
            data.push(chunks.toString("utf8"))
        })
        res.on("end", () => {
            console.log(data)
            console.log(res)
        })
    })
    req.on("error", err => {
        console.error(err)
    })
    req.write(JSON.stringify(payload))
    req.end()
}

// eventToBuild transforms pubsub event message to a build object.
const eventToBuild = data => {
    return JSON.parse(new Buffer(data, "base64").toString())
}

package.json

{
    "name": "google-container-status",
    "version": "0.0.1",
    "description": "Status integration for Google Cloud Container Builder, using Google Cloud Functions",
    "main": "index.js",
    "dependencies": {
        "jsonwebtoken": "8.1.0",
        "http2": ""
    }
}