const g_captcha_timeout_seconds = 600; const e_captcha = document.getElementsByClassName("captcha")[0]; let g_captcha_timeout_remain = g_captcha_timeout_seconds; let g_current_captcha_id = e_captcha.children[0].value; async function getNewCaptcha() { const id = await fetch("/api/captcha/", { method: "POST"}).then(r => r.text()); g_current_captcha_id = e_captcha.children[0].value = id; const style = window.matchMedia("(prefers-color-scheme: light)").matches ? "light" : "dark"; setTimeout(() => { e_captcha.children[1].src = `/api/captcha/${id}/image?style=${style}` }, 600); g_captcha_timeout_remain = g_captcha_timeout_seconds; } e_captcha.children[3].innerHTML = `ed in 600 seconds.`; const captcha_refresh = document.getElementById("refresh"); const captcha_remain = document.getElementById("remain"); captcha_refresh.classList.toggle("refresh"); captcha_refresh.addEventListener("click", async e => { e.preventDefault(); e.target.disabled = true; setTimeout(async () => { e.target.disabled = false; await fetch(`/api/captcha/${g_current_captcha_id}?remove`); }, 3000); e_captcha.children[2].value = ""; await getNewCaptcha(); }); // Remove unused CAPTCHA on a server. window.addEventListener("unload", () => fetch(`/api/captcha/${g_current_captcha_id}?remove`)); setInterval(async () => { captcha_remain.innerText = --g_captcha_timeout_remain; if (g_captcha_timeout_remain == 0) await getNewCaptcha(); }, 1000);