61 lines
2.4 KiB
JavaScript
61 lines
2.4 KiB
JavaScript
// GET/HEAD /a/w.js und /a/h.js (öffentlicher Listener): generierte Client-Skripte aus client/dist/.
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// Einmal beim Start in den Speicher geladen (roh + gzip); fehlt eine Datei, antwortet der Pfad mit 503.
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import { readFileSync } from 'node:fs';
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import { join, dirname } from 'node:path';
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import { fileURLToPath } from 'node:url';
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import { gzipSync } from 'node:zlib';
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import crypto from 'node:crypto';
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const DEFAULT_DIR = join(dirname(fileURLToPath(import.meta.url)), '..', 'client', 'dist');
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const FILES = { '/a/w.js': 'w.js', '/a/h.js': 'h.js' };
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export function createAssets({ distDir = DEFAULT_DIR, log = console } = {}) {
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const assets = new Map();
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for (const [path, file] of Object.entries(FILES)) {
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try {
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const raw = readFileSync(join(distDir, file));
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assets.set(path, { raw, gz: gzipSync(raw, { level: 9 }), etag: `"${crypto.createHash('sha256').update(raw).digest('hex')}"` });
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} catch (e) {
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log.error(`Analytics: Skript ${file} fehlt in ${distDir} (${e.code || e.message}); ${path} antwortet mit 503`);
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}
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}
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// true, wenn die Anfrage ein Skript betraf.
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return function handle(req, res, pathname) {
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if (!(pathname in FILES)) return false;
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if (req.method !== 'GET' && req.method !== 'HEAD') {
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res.writeHead(405, { Allow: 'GET, HEAD' });
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res.end();
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return true;
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}
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const a = assets.get(pathname);
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if (!a) {
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res.writeHead(503, { 'Content-Type': 'application/json', 'Cache-Control': 'no-store' });
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res.end(req.method === 'HEAD' ? '' : JSON.stringify({ error: 'Skript nicht verfügbar' }));
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return true;
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}
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const headers = {
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'Content-Type': 'text/javascript; charset=utf-8',
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'Cache-Control': 'public, max-age=3600',
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ETag: a.etag,
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Vary: 'Accept-Encoding',
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'X-Content-Type-Options': 'nosniff',
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'Cross-Origin-Resource-Policy': 'cross-origin',
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'Access-Control-Allow-Origin': '*',
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};
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const inm = req.headers['if-none-match'];
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if (inm && inm.split(',').some((t) => t.trim().replace(/^W\//, '') === a.etag)) {
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res.writeHead(304, headers);
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res.end();
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return true;
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}
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const gzip = /\bgzip\b/i.test(req.headers['accept-encoding'] || '');
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const body = gzip ? a.gz : a.raw;
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if (gzip) headers['Content-Encoding'] = 'gzip';
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headers['Content-Length'] = body.length;
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res.writeHead(200, headers);
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res.end(req.method === 'HEAD' ? undefined : body);
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return true;
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};
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}
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