new vCard export in vcards

.gitignore

@@ -14,3 +14,6 @@ __pycache__/
 
 # OS files
 .DS_Store
+
+# vCards
+vcards

app.py

@@ -2,6 +2,8 @@ from flask import Flask, render_template, request, redirect, url_for
 from flask_sqlalchemy import SQLAlchemy
 import os
 import re
+import pathlib
+import unicodedata
 
 BASE_DIR = os.path.dirname(os.path.abspath(__file__))
 DB_PATH = os.path.join(BASE_DIR, 'anmeldung.db')
@@ -94,6 +96,48 @@ def index():
             db.session.add(antwort)
         db.session.commit()
 
+        # vCard 4.0 erzeugen und speichern
+        try:
+            vcards_dir = os.path.join(BASE_DIR, 'vcards')
+            os.makedirs(vcards_dir, exist_ok=True)
+
+            # sanitize filename: remove diacritics and unsafe chars
+            def slug(s):
+                s = unicodedata.normalize('NFKD', s)
+                s = ''.join(c for c in s if not unicodedata.combining(c))
+                s = ''.join(c for c in s if c.isalnum() or c in (' ', '_', '-'))
+                return s.replace(' ', '_')
+
+            filename = f"{slug(adresse.nachname)}_{slug(adresse.vorname)}_{adresse.id}.vcf"
+            filepath = os.path.join(vcards_dir, filename)
+
+            # build vCard 4.0 content
+            lines = [
+                'BEGIN:VCARD',
+                'VERSION:4.0',
+                f'N:{adresse.nachname};{adresse.vorname};;;',
+                f'FN:{adresse.vorname} {adresse.nachname}',
+            ]
+            # ADR: PO Box;Extended;Street;Locality;Region;PostalCode;Country
+            street = adresse.strasse or ''
+            if adresse.hausnummer:
+                street = f"{street} {adresse.hausnummer}".strip()
+            adr = f'ADR:;;{street};{adresse.ort};;{adresse.plz};{adresse.land}'
+            lines.append(adr)
+            if adresse.email:
+                lines.append(f'EMAIL;TYPE=internet:{adresse.email}')
+            phone = ''
+            if adresse.telefon_vorwahl or adresse.telefon_nummer:
+                phone = f"+{adresse.telefon_vorwahl}{adresse.telefon_nummer}".replace('++', '+')
+                lines.append(f'TEL;TYPE=voice:{phone}')
+            lines.append('END:VCARD')
+
+            with open(filepath, 'w', encoding='utf-8') as f:
+                f.write('\n'.join(lines))
+        except Exception:
+            # nicht kritisch: bei Fehlern nicht die ganze Anfrage abbrechen
+            pass
+
         # Nach erfolgreichem Speichern weiterleiten
         return redirect(url_for('danke', id=adresse.id))