Dwelling/homepage/static/assets/js/captcha_refresh.js

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JavaScript
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const g_captcha_timeout_seconds = 600;
const captcha_hidden_field = document.forms[0].children[4].children[0];
let g_captcha_timeout_remain = g_captcha_timeout_seconds;
let g_current_captcha_id = captcha_hidden_field.value;
function getColorScheme() {
return window.matchMedia("(prefers-color-scheme: light)").matches ? "light" : "dark";
}
async function getNewCaptcha() {
const id = await fetch("/captcha/").then(r => r.text());
g_current_captcha_id = id;
captcha_hidden_field.value = id;
setTimeout(() => { captcha_img.src = `/captcha/${id}/image?style=${getColorScheme()}` }, 600);
g_captcha_timeout_remain = g_captcha_timeout_seconds;
}
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const captcha_span = document.getElementsByClassName("captcha")[0];
const captcha_img = captcha_span.children[1];
captcha_span.classList.toggle("refresh");
captcha_span.children[3].innerHTML =
`<button id="refresh">Refresh</button>ed in <b><span id="remain">600</span></b> seconds.`;
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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();
captcha_refresh.disabled = true;
setTimeout(async () => {
captcha_refresh.disabled = false;
await fetch(`/captcha/${g_current_captcha_id}?remove`); }, 3000);
document.getElementsByName("captcha_answer")[0].value = "";
await getNewCaptcha();
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});
// Remove unused CAPTCHA on a server.
window.addEventListener("unload", () => fetch(`/captcha/${g_current_captcha_id}?remove`));
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setInterval(async () => {
captcha_remain.innerText = --g_captcha_timeout_remain;
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if (g_captcha_timeout_remain == 0)
await getNewCaptcha();
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}, 1000);