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"use strict";
export const DATE_FMT = new Intl.DateTimeFormat("de-DE", {
month: "numeric",
day: "numeric",
year: "numeric",
});
export const DATETIME_FMT = new Intl.DateTimeFormat("de-DE", {
month: "numeric",
day: "numeric",
year: "numeric",
hour: "numeric",
minute: "numeric",
});
export function dateStringNow() {
return DATE_FMT.format(new Date());
}
export function datetimeStringNow() {
return DATETIME_FMT.format(new Date());
}
// TODO(muhq): Cache the retrieved URL
export async function getUserIconUrl(userId: number): Promise<string> {
const userRes = await fetch(`https://lernplattform.bycs.de/user/profile.php?id=${userId}`);
const userDoc = new DOMParser().parseFromString(await userRes.text(), "text/html");
const userpicture = userDoc.querySelector(".userpicture");
if (userpicture === null) {
return "";
}
return (userpicture as HTMLImageElement).src ?? "";
}
// SplitMix32 implementation taken from:
// https://github.com/bryc/code/blob/master/jshash/PRNGs.md
// We only need a seeded PRNG to choose students to observe.
export function splitmix32(a: number) {
return function () {
a |= 0;
a = (a + 0x9e3779b9) | 0;
let t = a ^ (a >>> 16);
t = Math.imul(t, 0x21f0aaad);
t = t ^ (t >>> 15);
t = Math.imul(t, 0x735a2d97);
return ((t = t ^ (t >>> 15)) >>> 0) / 4294967296;
};
}
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