Merge commit '80eca1bc7c1174f9c44a8df9af4ddc8ab855291b' as 'cms/core'
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import { Hono } from 'hono';
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import { mkdir, writeFile } from 'node:fs/promises';
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import path from 'node:path';
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import sharp from 'sharp';
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// Bild-Upload → static/images/. Raster-Bilder werden zu WebP konvertiert
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// (kleiner, web-optimiert), auf max. 2000px begrenzt, EXIF-Rotation korrigiert.
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// SVG/GIF bleiben unangetastet (Vektor/Animation erhalten).
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//
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// Sicherheit: hartes Größenlimit (DoS / Decompression-Bombs), Raster wird über
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// sharp-Metadaten als echtes Bild verifiziert, SVG nur wenn es wie SVG aussieht.
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// Hochgeladene Dateien werden zudem mit strikter CSP (sandbox) ausgeliefert
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// (siehe index.js, /images/*) → ein bösartiges SVG kann kein JS im Origin starten.
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const SITE_DIR = process.env.SITE_DIR || '/site';
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const MAX_UPLOAD = 8 * 1024 * 1024; // 8 MB Rohdatei
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const ALLOWED_RASTER = new Set(['jpeg', 'png', 'webp', 'avif', 'tiff']);
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const upload = new Hono();
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upload.post('/', async (c) => {
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const body = await c.req.parseBody();
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const file = body['file'];
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if (!file || typeof file === 'string') return c.json({ error: 'Keine Datei' }, 400);
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if (typeof file.size === 'number' && file.size > MAX_UPLOAD) {
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return c.json({ error: 'Datei zu groß (max. 8 MB)' }, 413);
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}
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const buffer = Buffer.from(await file.arrayBuffer());
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if (buffer.length > MAX_UPLOAD) return c.json({ error: 'Datei zu groß (max. 8 MB)' }, 413);
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if (!buffer.length) return c.json({ error: 'Leere Datei' }, 400);
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const dir = path.join(SITE_DIR, 'static', 'images');
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await mkdir(dir, { recursive: true });
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const ext = path.extname(file.name || '').toLowerCase();
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const base = `${safeBase(file.name)}-${uid()}`;
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let outName, outBuf;
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if (ext === '.svg') {
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// Muss wie SVG aussehen (Magie/Marker), sonst ablehnen.
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const head = buffer.subarray(0, 512).toString('utf8').trimStart().toLowerCase();
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if (!head.startsWith('<?xml') && !head.startsWith('<svg')) {
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return c.json({ error: 'Keine gültige SVG-Datei' }, 400);
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}
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outName = `${base}.svg`;
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outBuf = buffer;
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} else if (ext === '.gif') {
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// GIF-Magie prüfen (kann kein Skript ausführen → Passthrough ok).
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const sig = buffer.subarray(0, 6).toString('latin1');
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if (sig !== 'GIF87a' && sig !== 'GIF89a') return c.json({ error: 'Keine gültige GIF-Datei' }, 400);
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outName = `${base}.gif`;
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outBuf = buffer;
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} else {
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// Raster: über sharp als echtes Bild verifizieren, dann zu WebP.
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let meta;
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try { meta = await sharp(buffer).metadata(); } catch { meta = null; }
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if (!meta || !ALLOWED_RASTER.has(meta.format)) {
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return c.json({ error: 'Kein unterstütztes Bildformat' }, 400);
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}
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outName = `${base}.webp`;
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outBuf = await sharp(buffer)
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.rotate()
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.resize({ width: 2000, withoutEnlargement: true })
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.webp({ quality: 82 })
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.toBuffer();
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}
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await writeFile(path.join(dir, outName), outBuf);
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return c.json({ url: `/images/${outName}` });
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});
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// Sicherer Basisname ohne Endung.
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function safeBase(raw) {
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const base = path.basename(String(raw || 'bild')).replace(/\.[^.]+$/, '');
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const cleaned = base.toLowerCase().replace(/[^a-z0-9._-]+/g, '-').replace(/^-+|-+$/g, '');
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return cleaned || 'bild';
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}
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// Kurze eindeutige Endung, damit gleichnamige Uploads nicht kollidieren.
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function uid() {
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return Date.now().toString(36).slice(-4) + Math.random().toString(36).slice(2, 5);
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}
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export default upload;
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