Kontaktformular-Dienst (Node + nodemailer), self-hosted für Coolify

- POST /api/kontakt: validiert, Honeypot-Spamschutz, Rate-Limit (5/10min) - Versand per SMTP über eigenes Postfach, keine Speicherung/DB - CORS auf die eigene Website beschränkt (ALLOWED_ORIGIN) - Konfiguration komplett über Environment-Variablen (.env.example) Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-03 15:13:38 +02:00
commit a617846aa9
@@ -0,0 +1,19 @@
+# Diese Werte in Coolify als Environment-Variablen setzen (NICHT committen).
+
+# Welche Website darf das Formular abschicken (CORS). Kommagetrennt möglich.
+ALLOWED_ORIGIN=https://atilgan-gartenbau.de,https://www.atilgan-gartenbau.de
+
+# SMTP-Zugang des Postfachs, über das gesendet wird
+SMTP_HOST=mail.euer-provider.de
+SMTP_PORT=587
+SMTP_SECURE=false          # true bei Port 465
+SMTP_USER=info@adnan-atilgan.de
+SMTP_PASS=euer-postfach-passwort
+
+# Empfänger & Absender
+MAIL_TO=info@adnan-atilgan.de
+MAIL_FROM=info@adnan-atilgan.de
+MAIL_SUBJECT_PREFIX=[Webseite]
+
+# Port (Coolify setzt den i. d. R. selbst)
+PORT=3000
@@ -0,0 +1,5 @@
+node_modules/
+.env
+.env.local
+npm-debug.log*
+.DS_Store
@@ -0,0 +1,31 @@
+# kontakt-api
+
+Winziger, selbst gehosteter Dienst, der das Kontaktformular von
+`atilgan-gartenbau.de` entgegennimmt und als E-Mail über das eigene Postfach
+verschickt. **Keine Datenbank, keine Speicherung** – die Daten verlassen den
+eigenen Server nur als E-Mail an den Betreiber. Node.js + nodemailer.
+
+## Endpunkt
+`POST /api/kontakt` — JSON: `{ name, email, telefon, betreff, nachricht, website }`
+(`website` = Honeypot, muss leer sein). Antwort: `{ ok: true }` oder Fehler.
+`GET /health` — Health-Check.
+
+## Deployment auf Coolify
+1. Neue **Application** aus diesem Repo (`kontakt-api`) anlegen.
+2. Build Pack: **Nixpacks** (erkennt Node automatisch, `npm start`). Kein Dockerfile nötig.
+3. Eine **Domain/Subdomain** vergeben, z. B. `https://formular.atilgan-gartenbau.de`.
+4. **Environment-Variablen** setzen (siehe `.env.example`), v. a.:
+   - `ALLOWED_ORIGIN` = die Live-Domain der Website
+   - `SMTP_HOST`, `SMTP_PORT`, `SMTP_SECURE`, `SMTP_USER`, `SMTP_PASS`
+   - `MAIL_TO` (Standard: info@adnan-atilgan.de)
+5. Deployen. Test: `GET https://formular.atilgan-gartenbau.de/health` → `{ "ok": true }`.
+
+Anschließend im Website-Repo in `js/main.js` die Konstante `KONTAKT_ENDPOINT`
+auf `https://<eure-subdomain>/api/kontakt` setzen (falls abweichend).
+
+## Lokal testen
+```bash
+npm install
+cp .env.example .env   # Werte eintragen
+npm start
+```
@@ -0,0 +1,812 @@
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+  "name": "kontakt-api",
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+  "lockfileVersion": 3,
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+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    }
+  }
+}
@@ -0,0 +1,19 @@
+{
+  "name": "kontakt-api",
+  "version": "1.0.0",
+  "description": "Kleiner Mail-Weiterleitungs-Dienst für das Kontaktformular von atilgan-gartenbau.de",
+  "type": "module",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "engines": {
+    "node": ">=18"
+  },
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^4.21.2",
+    "express-rate-limit": "^7.5.0",
+    "nodemailer": "^6.10.0"
+  }
+}
@@ -0,0 +1,108 @@
+// Kontaktformular-Dienst für atilgan-gartenbau.de
+// Nimmt das Formular per POST entgegen und verschickt es als E-Mail über das
+// eigene Postfach (SMTP). Speichert nichts – die Daten verlassen den eigenen
+// Server nur als E-Mail an den Betreiber.
+
+import express from 'express';
+import cors from 'cors';
+import rateLimit from 'express-rate-limit';
+import nodemailer from 'nodemailer';
+
+const {
+  PORT = 3000,
+  ALLOWED_ORIGIN = '',            // z. B. "https://atilgan-gartenbau.de,https://www.atilgan-gartenbau.de"
+  SMTP_HOST,
+  SMTP_PORT = 587,
+  SMTP_SECURE = 'false',          // "true" für Port 465
+  SMTP_USER,
+  SMTP_PASS,
+  MAIL_TO = 'info@adnan-atilgan.de',
+  MAIL_FROM,                       // Absender; wenn leer, wird SMTP_USER genutzt
+  MAIL_SUBJECT_PREFIX = '[Webseite] ',
+} = process.env;
+
+const app = express();
+app.set('trust proxy', 1);        // hinter Coolify/Reverse-Proxy korrekte IP
+app.use(express.json({ limit: '32kb' }));
+
+// --- CORS: nur die eigene Website darf das Formular abschicken ---
+const allowList = ALLOWED_ORIGIN.split(',').map((s) => s.trim()).filter(Boolean);
+app.use(
+  cors({
+    origin(origin, cb) {
+      // Anfragen ohne Origin (z. B. Health-Checks) erlauben
+      if (!origin || allowList.length === 0 || allowList.includes(origin)) return cb(null, true);
+      return cb(new Error('Origin nicht erlaubt'));
+    },
+    methods: ['POST', 'OPTIONS'],
+  })
+);
+
+// --- Rate-Limit gegen Spam/Missbrauch ---
+const limiter = rateLimit({
+  windowMs: 10 * 60 * 1000, // 10 Minuten
+  max: 5,                    // max. 5 Nachrichten pro IP und Fenster
+  standardHeaders: true,
+  legacyHeaders: false,
+  message: { ok: false, error: 'Zu viele Anfragen. Bitte versuchen Sie es später erneut.' },
+});
+
+// --- SMTP-Transport ---
+const transporter = nodemailer.createTransport({
+  host: SMTP_HOST,
+  port: Number(SMTP_PORT),
+  secure: String(SMTP_SECURE) === 'true',
+  auth: SMTP_USER ? { user: SMTP_USER, pass: SMTP_PASS } : undefined,
+});
+
+const isEmail = (v) => /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(v || '');
+const clean = (v) => String(v || '').trim().slice(0, 5000);
+
+// --- Health-Check ---
+app.get('/', (_req, res) => res.json({ ok: true, service: 'kontakt-api' }));
+app.get('/health', (_req, res) => res.json({ ok: true }));
+
+// --- Formular-Endpunkt ---
+app.post('/api/kontakt', limiter, async (req, res) => {
+  try {
+    const b = req.body || {};
+
+    // Honeypot: echtes Formular lässt dieses Feld leer; Bots füllen es aus
+    if (clean(b.website)) return res.json({ ok: true }); // still & unauffällig „erfolgreich"
+
+    const name = clean(b.name);
+    const email = clean(b.email);
+    const telefon = clean(b.telefon);
+    const betreff = clean(b.betreff) || 'Anfrage über die Webseite';
+    const nachricht = clean(b.nachricht);
+
+    if (!name || !nachricht || !isEmail(email)) {
+      return res.status(400).json({ ok: false, error: 'Bitte Name, gültige E-Mail und Nachricht angeben.' });
+    }
+
+    const text =
+      `Neue Nachricht über das Kontaktformular\n\n` +
+      `Name:    ${name}\n` +
+      `E-Mail:  ${email}\n` +
+      `Telefon: ${telefon || '-'}\n` +
+      `Betreff: ${betreff}\n\n` +
+      `Nachricht:\n${nachricht}\n`;
+
+    await transporter.sendMail({
+      from: MAIL_FROM || SMTP_USER,
+      to: MAIL_TO,
+      replyTo: `${name} <${email}>`,
+      subject: `${MAIL_SUBJECT_PREFIX}${betreff}`,
+      text,
+    });
+
+    return res.json({ ok: true });
+  } catch (err) {
+    console.error('Mailversand fehlgeschlagen:', err.message);
+    return res.status(500).json({ ok: false, error: 'Nachricht konnte nicht gesendet werden.' });
+  }
+});
+
+app.listen(PORT, () => {
+  console.log(`kontakt-api läuft auf Port ${PORT}`);
+});