125 lines
3.9 KiB
JavaScript
125 lines
3.9 KiB
JavaScript
async function decrypt(ciphertext, password) {
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const pwUtf8 = new TextEncoder().encode(password);
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const pwHash = await crypto.subtle.digest('SHA-256', pwUtf8);
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const ctUtf8 = new Uint8Array(ciphertext);
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const iv = ctUtf8.slice(0, 12);
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const alg = { name: 'AES-GCM', iv: iv, additionalData: iv };
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const key = await crypto.subtle.importKey('raw', pwHash, alg, false, ['decrypt']);
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try {
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const buf = await crypto.subtle.decrypt(alg, key, ctUtf8.slice(12));
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return new TextDecoder().decode(buf);
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} catch (e) {
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throw new Error('Decrypt failed')
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}
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}
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function setError(text) {
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document.getElementById('msg').innerText = text;
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}
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function setFields(elem, fields) {
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for (const [k, v] of Object.entries(fields)) {
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for (const el of elem.querySelectorAll('#' + k)) {
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el.innerText = v;
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}
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}
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}
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async function apply(data, password) {
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const json = JSON.parse(await decrypt(data, password));
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const now = new Date().getTime();
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const vA = new Date(json['valid_since'] + 'T00:00:00');
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if (vA.getTime() > now) {
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return setError('Member card not valid yet');
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}
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const vZ = new Date(json['valid_until'] + 'T23:59:59');
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if (vZ.getTime() < now) {
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return setError('Member card expired');
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}
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const pass = document.getElementById('pass');
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const imgElem = pass.querySelector('#img');
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if (imgElem) {
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if (json['img']) {
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imgElem.src = 'data:image;base64,' + json['img'];
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} else {
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imgElem.src = 'img/no-img.svg';
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}
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}
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setFields(pass, {
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name: json['name'],
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member_id: json['id'],
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org_name: json['org'],
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valid: 'on ' + new Date().toLocaleDateString('en'),
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});
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setFields(pass, json['data']); // may overwrite previous fields
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const title = 'Member card for ' + json['name'] + ' – ' + json['org'];
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document.head.querySelector('title').innerText = title;
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document.getElementById('msg').classList.add('hidden');
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pass.classList.remove('hidden');
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}
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async function onLoad() {
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// reset previous download
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document.getElementById('pass').classList.add('hidden');
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const msg = document.getElementById('msg');
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msg.innerText = msg.dataset.load;
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msg.classList.remove('hidden');
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// download new data
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const [org, uuid, secret] = location.hash.slice(1).split('/');
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if (!org || !uuid || !secret) {
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return setError('Invalid URL');
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}
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const res = await fetch('./data/' + org + '/' + uuid);
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if (!res.ok) {
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return setError('Error loading\n\n' + res.status + ' ' + res.statusText);
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}
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try {
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const data = await res.arrayBuffer();
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await apply(data, secret);
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} catch (e) {
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setError(e);
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}
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}
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// load and parse data
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window.onload = onLoad;
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// force reload if hash params change
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window.addEventListener('hashchange', onLoad, true);
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// -------------
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// scale-up card
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// -------------
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function onResize() {
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const card = document.getElementById('card');
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const sw = window.innerWidth / card.offsetWidth;
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const sh = window.innerHeight / card.offsetHeight;
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card.style.scale = Math.min(Math.min(sw, sh) * 0.97, 2);
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}
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window.addEventListener('resize', onResize, true);
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window.addEventListener('orientationchange', onResize, true);
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screen?.orientation?.addEventListener('change', onResize, true);
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// -----------------
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// check for updates
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// -----------------
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lastUpdate = new Date().getTime();
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function needsUpdate() {
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// reload page if older than 15min
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const now = new Date().getTime();
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if (now - lastUpdate > 900_000) {
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lastUpdate = now;
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onLoad();
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}
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}
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// setInterval(needsUpdate, 1000);
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window.addEventListener('focus', needsUpdate, true);
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window.addEventListener('pageshow', needsUpdate, true);
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window.addEventListener('visibilitychange', function () {
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!document.hidden && document.visibilityState !== 'hidden' && needsUpdate();
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}, true);
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