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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());
}
declare global {
var M: { cfg: { userId: number; courseId: number } };
}
export function getUserId(): number {
// M is exported by Moodle
return globalThis.M.cfg.userId;
}
export function getCourseId(): number {
// M is exported by Moodle
return globalThis.M.cfg.courseId;
}
export class CourseLocalStorage {
static getItem(key: string) {
return localStorage.getItem(`${key}-${getCourseId()}`);
}
static setItem(key: string, val: string) {
return localStorage.setItem(`${key}-${getCourseId()}`, val);
}
}
export async function getUserIconUrl(userId: number): Promise<string> {
let url = CourseLocalStorage.getItem(`bycs-sol-user-icon-${userId}`);
if (url) return url;
const userRes = await fetch(`https://lernplattform.bycs.de/user/profile.php?id=${userId}`);
const userDoc = new DOMParser().parseFromString(await userRes.text(), "text/html");
const userpicture = userDoc.querySelector(".userpicture");
if (userpicture === null) {
return "";
}
url = (userpicture as HTMLImageElement).src ?? "";
CourseLocalStorage.setItem(`bycs-sol-user-icon-${userId}`, url);
return url;
}
// 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;
};
}
const MOODLE_DATE_REGEX = /\w+, (\d+)\. (\w+) (\d+), (\d\d):(\d\d)/;
const MONTHS: { [m: string]: number } = {
Januar: 1,
Februar: 2,
März: 3,
April: 4,
Mai: 5,
Juni: 6,
Juli: 7,
August: 8,
September: 9,
Oktober: 10,
November: 11,
Dezember: 12,
};
export function parseMoodleDate(s: string) {
const match = MOODLE_DATE_REGEX.exec(s);
if (!match) {
return new Date(-1);
}
const month = MONTHS[match[2]];
return new Date(Number(match[3]), month, Number(match[1]), Number(match[4]), Number(match[4]));
}
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