keys/routes/ping.js

let express = require("express");
let ipaddr = require("ipaddr.js");
let db = require("../libs/Database").instance();
let router = express.Router();

const IP_TYPES = ["ipv4", "ipv6"];

function combineToList(a, b) {
    return a + "\n" + b;
}

function toList(array) {
    return array.reduce(combineToList, "").trim();
}

function testIP(req, res, next) {
	let addr = ipaddr.parse(req.ip);
    if (!IP_TYPES.includes(addr.kind())) return res.status(400).send("Invalid ip address");
	req.params.addr = addr;
	next();
}

router.use((req, res, next) => {
    res.type('text/plain');
	next();
});

router.get("/", testIP, (req, res) => {
	res.send(req.params.addr.toString());
});

router.get("/:fqdn", (req, res) => {
    db.q.select(IP_TYPES.concat(IP_TYPES.map(e => e + "LastPing"))).from("addresses").filter("fqdn", req.params.fqdn).first((e, d) => {
		if (e) return res.status(400).send("Error");
		if (!d) return res.status(404).send("Unknown FQDN");
		res.send([
		    d.ipv4 ? d.ipv4 : "0.0.0.0",
		    d.ipv4LastPing,
		    d.ipv6 ? d.ipv6 : "::",
		    d.ipv6LastPing,
		].reduce((a, b) => a + "\n" + b));
	});
});

router.get("/:fqdn/:code", testIP, (req, res) => {
	let addr = req.params.addr;
    db.query("UPDATE addresses SET " + addr.kind() + " = ?, " + addr.kind() + "LastPing = CURRENT_TIMESTAMP WHERE fqdn = ? AND code = ?", [addr.toString(), req.params.fqdn, req.params.code], (e, d) => {
		if (e) return res.status(400).send("Error");
		if (d.affectedRows <= 0) return res.status(400).send("Invalid token");
		res.send(addr.toString());
	});
});

module.exports = router;