First version

app.py

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+import secrets
+import datetime
+from flask import Flask, render_template, request, jsonify, send_file
+from weasyprint import HTML
+import io
+
+app = Flask(__name__)
+
+def generate_secure_password():
+    # Length: randomly between 12 and 16 characters
+    length = secrets.choice(range(12, 17))
+    
+    # Allowed Characters
+    upper = "ABCDEFGHJKMNPQRSTUVWXYZ" # without I, L, O
+    lower = "abcdefghjkmnpqrstuvwxyz" # without i, l, o
+    digits = "23456789" # without 0, 1
+    special = "!§$%&/()=?\\+#*-_,;.:@€"
+    
+    while True:
+        password = ''.join(secrets.choice(upper + lower + digits + special) for _ in range(length))
+        
+        # Minimum 2 characters from each category
+        if (sum(c in upper for c in password) >= 2 and
+            sum(c in lower for c in password) >= 2 and
+            sum(c in digits for c in password) >= 2 and
+            sum(c in special for c in password) >= 2):
+            
+            # Double check that no forbidden characters somehow made it in
+            forbidden = "ILOilo01ÄÖÜäöü<>|~´`'^°\""
+            if not any(c in forbidden for c in password):
+                return password
+
+@app.route('/')
+def index():
+    return render_template('index.html')
+
+@app.route('/api/generate_password', methods=['GET'])
+def api_generate_password():
+    password = generate_secure_password()
+    return jsonify({"password": password})
+
+@app.route('/download_pdf', methods=['POST'])
+def download_pdf():
+    vorname = request.form.get('vorname', '')
+    nachname = request.form.get('nachname', '')
+    benutzername = request.form.get('benutzername', '')
+    passwort = request.form.get('passwort', '')
+    
+    datum = datetime.datetime.now().strftime("%d.%m.%Y")
+    
+    # Render template
+    html_out = render_template(
+        'benutzer_template.html',
+        VORNAME=vorname,
+        NACHNAME=nachname,
+        BENUTZERNAME=benutzername,
+        PASSWORT=passwort,
+        DATUM=datum
+    )
+    
+    # Generate PDF
+    pdf_file = io.BytesIO()
+    HTML(string=html_out).write_pdf(pdf_file)
+    pdf_file.seek(0)
+    
+    # Format filename safely
+    safe_vorname = vorname.replace(' ', '_')
+    safe_nachname = nachname.replace(' ', '_')
+    filename = f"Benutzerantrag_{safe_vorname}_{safe_nachname}.pdf"
+    
+    return send_file(
+        pdf_file,
+        download_name=filename,
+        as_attachment=True,
+        mimetype='application/pdf'
+    )
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=5000, debug=True)