Checks the Last-Modified response header of a URL every 60 seconds, if it changes, it sends a alert to a discord webhook.

lastModifiedHeaderTracker.v

module main

import time
import net.http

const webhook_url = "https://discord.com/api/webhooks/channelid/webhookid"
const target_url = "https://www.website.com/index.html"

fn main() {
	mut last_modified_header := ""
	for {
		resp := http.get(target_url) or {
			eprintln("Couldn't get url")
			return
		}
		last_modified := resp.header.get(http.CommonHeader.last_modified)!

		if last_modified != last_modified_header {
			send_discord_message(last_modified)
			last_modified_header = last_modified
		}
		time.sleep(60 * time.second)
	}
}

fn send_discord_message(message string) {
	warning := ":warning: Last-Modified is now `" + message + "`"
	eprint(warning)
	result := http.post_json(webhook_url, '{ "content":"' + warning + '"}') or {
		eprint("Couldnt send message to webhook: ")
		eprintln(err)
		return
	}
	eprintln(result.body)
}