main.js

let oldStatus = undefined

const { WEBHOOK_URL } = process.env
if (!WEBHOOK_URL) {
	throw new Error('WEBHOOK_URL required')
}


const StatusNameMap = {
	100: 'Continue',
	101: 'Switching Protocols',
	102: 'Processing',
	103: 'Early Hints',
	200: 'OK',
	201: 'Created',
	202: 'Accepted',
	203: 'Non-Authoritative Information',
	204: 'No Content',
	205: 'Reset Content',
	206: 'Partial Content',
	207: 'Multi-Status',
	208: 'Already Reported',
	226: 'IM Used',
	300: 'Multiple Choices',
	301: 'Moved Permanently',
	302: 'Found',
	303: 'See Other',
	304: 'Not Modified',
	305: 'Use Proxy',
	306: 'Switch Proxy',
	307: 'Temporary Redirect',
	308: 'Permanent Redirect',
	400: 'Bad Request',
	401: 'Unauthorized',
	402: 'Payment Required',
	403: 'Forbidden',
	404: 'Not Found',
	405: 'Method Not Allowed',
	406: 'Not Acceptable',
	407: 'Proxy Authentication Required',
	408: 'Request Timeout',
	409: 'Conflict',
	410: 'Gone',
	411: 'Length Required',
	412: 'Precondition Failed',
	413: 'Payload Too Large',
	414: 'URI Too Long',
	415: 'Unsupported Media Type',
	416: 'Range Not Satisfiable',
	417: 'Expectation Failed',
	418: "I'm a Teapot",
	421: 'Misdirected Request',
	422: 'Unprocessable Entity',
	423: 'Locked',
	424: 'Failed Dependency',
	425: 'Too Early',
	426: 'Upgrade Required',
	428: 'Precondition Required',
	429: 'Too Many Requests',
	431: 'Request Header Fields Too Large',
	451: 'Unavailable For Legal Reasons',
	500: 'Internal Server Error',
	501: 'Not Implemented',
	502: 'Bad Gateway',
	503: 'Service Unavailable',
	504: 'Gateway Timeout',
	505: 'HTTP Version Not Supported',
	506: 'Variant Also Negotiates',
	507: 'Insufficient Storage',
	508: 'Loop Detected',
	510: 'Not Extended',
	511: 'Network Authentication Required',
};

const check = async () => {
	try {
		const response = await fetch('https://datathon.library.uta.edu', {
			headers: {
				'User-Agent': 'JaneIRL/is-datathon-website-up'
			}
		})
		updateStatus(response.status)
		oldStatus = response.status
	} catch (e) {
		console.error(e)
	} finally {
		setTimeout(check, 60_000)
	}
}

/**
 * @param {number} newStatus 
 */
const updateStatus = async (newStatus) => {
	if (oldStatus !== newStatus) {
		const isGood = newStatus === 200
		console.log(`[${isGood}] Status code changed: ${newStatus}`)
		await fetch(WEBHOOK_URL, {
			method: 'POST',
			headers: {
				'Content-Type': 'application/json',
			},
			body: JSON.stringify({
				content: `${isGood ? ':green_circle:' : ':red_square:'} <https://datathon.library.uta.edu> responded with ${newStatus} ${StatusNameMap[newStatus]}`,
			}),
		})
	}
}

check();