diff --git a/imaginaerraum_door_admin/forms.py b/imaginaerraum_door_admin/forms.py
new file mode 100644
index 0000000..1f893a9
--- /dev/null
+++ b/imaginaerraum_door_admin/forms.py
@@ -0,0 +1,46 @@
+from flask import flash
+from flask_wtf import FlaskForm
+from wtforms.fields import DateField, EmailField
+from wtforms.fields import StringField, BooleanField
+from wtforms.validators import DataRequired, ValidationError, EqualTo
+from datetime import date
+
+
+def validate_valid_thru_date(form, field):
+    if form.limit_validity.data:
+        # only check date format if limited validity of token is set
+        try:
+            if not field.data >= date.today():
+                raise ValueError
+        except ValueError as e:
+            flash("Ungültiges Datum")
+            raise ValidationError
+    return True
+
+
+class TokenForm(FlaskForm):
+    name = StringField("Name", validators=[DataRequired()])
+    email = EmailField("E-Mail", validators=[DataRequired()])
+    organization = StringField("Organization", validators=[DataRequired()])
+    limit_validity = BooleanField("Gültigkeit begrenzen?")
+    valid_thru = DateField("Gültig bis", validators=[validate_valid_thru_date])
+    active = BooleanField("Aktiv?")
+    dsgvo = BooleanField(
+        "Einwilligung Nutzungsbedingungen erfragt?", validators=[DataRequired()]
+    )
+
+
+class ConfirmDeleteForm(FlaskForm):
+    name = StringField(
+        "Name",
+        validators=[
+            DataRequired(),
+            EqualTo("name_confirm", "Name stimmt nicht überein"),
+        ],
+    )
+    name_confirm = StringField("Name confirm")
+
+
+class AdminCreationForm(FlaskForm):
+    name = StringField("Name", validators=[DataRequired()])
+    email = EmailField("E-Mail", validators=[DataRequired()])
diff --git a/imaginaerraum_door_admin/webapp.py b/imaginaerraum_door_admin/webapp.py
index 846a031..b6b4331 100644
--- a/imaginaerraum_door_admin/webapp.py
+++ b/imaginaerraum_door_admin/webapp.py
@@ -1,11 +1,19 @@
-from flask import render_template, request, flash, redirect, session, send_file, Blueprint, current_app
+from flask import (
+    render_template,
+    request,
+    flash,
+    redirect,
+    send_file,
+    Blueprint,
+    current_app,
+)
 from werkzeug.utils import secure_filename
-from flask_wtf import FlaskForm
-from wtforms.fields import DateField, EmailField
-from wtforms.fields import StringField, BooleanField
-from wtforms.validators import DataRequired, ValidationError, EqualTo
-from flask_security import auth_required, hash_password, \
-    current_user, roles_required
+from flask_security import (
+    auth_required,
+    hash_password,
+    current_user,
+    roles_required
+)
 from flask_security.views import change_password
 from email_validator import validate_email
 
@@ -17,207 +25,231 @@ import tempfile
 from datetime import date, datetime, timedelta
 
 from imaginaerraum_door_admin import db, security
+from imaginaerraum_door_admin.forms import (
+    AdminCreationForm,
+    ConfirmDeleteForm,
+    TokenForm,
+)
 
 
-def validate_valid_thru_date(form, field):
-    if form.limit_validity.data:  # only check date format if limited validity of token is set
-        try:
-            if not field.data >= date.today():
-                raise ValueError
-        except ValueError as e:
-            flash("Ungültiges Datum")
-            raise ValidationError
-    return True
+door_app = Blueprint("door_app", __name__, template_folder="templates")
 
 
-class TokenForm(FlaskForm):
-    name = StringField('Name', validators=[DataRequired()])
-    email = EmailField('E-Mail', validators=[DataRequired()])
-    organization = StringField('Organization', validators=[DataRequired()])
-    limit_validity = BooleanField('Gültigkeit begrenzen?')
-    valid_thru = DateField('Gültig bis', validators=[validate_valid_thru_date])
-    active = BooleanField('Aktiv?')
-    dsgvo = BooleanField('Einwilligung Nutzungsbedingungen erfragt?', validators=[DataRequired()])
-
-
-class ConfirmDeleteForm(FlaskForm):
-    name = StringField('Name', validators=[DataRequired(), EqualTo('name_confirm', 'Name stimmt nicht überein')])
-    name_confirm = StringField('Name confirm')
-
-
-class AdminCreationForm(FlaskForm):
-    name = StringField('Name', validators=[DataRequired()])
-    email = EmailField('E-Mail', validators=[DataRequired()])
-
-door_app = Blueprint('door_app', __name__,
-                        template_folder='templates')
-
-
-# we override the change_password view from flask security to only allow local users to change their passwords
+# we override the change_password view from flask security to only allow local
+# users to change their passwords
 # LDAP users should use the LDAP self service for changing passwords
 # this route needs to be defined before the Flask Security setup
-@door_app.route('/change', methods=['GET', 'POST'])
+@door_app.route("/change", methods=["GET", "POST"])
 @auth_required()
 def change_pw():
-    if current_user.has_role('local'):
+    if current_user.has_role("local"):
         # local users can change their password
         return change_password()
     else:
         # LDAP users get redirected to the LDAP self service
-        return redirect('https://ldap.imaginaerraum.de/')
+        return redirect("https://ldap.imaginaerraum.de/")
 
 
 # admin user management
-@door_app.route('/manage_admins', methods=['GET', 'POST'])
-@roles_required('super_admin')
+@door_app.route("/manage_admins", methods=["GET", "POST"])
+@roles_required("super_admin")
 def manage_admins():
     form = AdminCreationForm()
-    if request.method == 'GET':
+    if request.method == "GET":
         users = security.datastore.user_model.query.all()
-        admin_data = [{'username': u.username, 'email': u.email, 'active': u.is_active,
-                       'admin': u.has_role('admin'), 'super_admin': u.has_role('super_admin'),
-                       } for u in users]
-        return render_template('admins.html', admin_data=admin_data, form=form)
+        admin_data = [
+            {
+                "username": u.username,
+                "email": u.email,
+                "active": u.is_active,
+                "admin": u.has_role("admin"),
+                "super_admin": u.has_role("super_admin"),
+            }
+            for u in users
+        ]
+        return render_template("admins.html", admin_data=admin_data, form=form)
     elif form.validate():
-        if security.datastore.find_user(username=form.name.data) is not None or \
-                security.datastore.find_user(email=form.email.data) is not None:
-            flash("Ein Benutzer mit diesem Nutzernamen oder dieser E-Mail-Adresse existiert bereits!")
+        if (
+            security.datastore.find_user(username=form.name.data) is not None
+            or security.datastore.find_user(email=form.email.data) is not None
+        ):
+            flash(
+                "Ein Benutzer mit diesem Nutzernamen oder dieser E-Mail-Adresse"
+                " existiert bereits!"
+            )
         else:
             pw = secrets.token_urlsafe(16)
-            new_user = security.datastore.create_user(username=form.name.data, email=form.email.data,
-                                                  password=hash_password(pw))
-            security.datastore.add_role_to_user(new_user, 'local')
+            new_user = security.datastore.create_user(
+                username=form.name.data,
+                email=form.email.data,
+                password=hash_password(pw),
+            )
+            security.datastore.add_role_to_user(new_user, "local")
             current_app.logger.info(
-                f"Super admin {current_user.username} created new user account for {new_user.username} <{new_user.email}>")
-            flash(f"Ein Account für den Nutzer {new_user.username} wurde erstellt. Verwende das Passwort {pw} um den Nutzer einzuloggen.")
+                f"Super admin {current_user.username} created new user account "
+                f"for {new_user.username} <{new_user.email}>"
+            )
+            flash(
+                f"Ein Account für den Nutzer {new_user.username} wurde "
+                f"erstellt. Verwende das Passwort {pw} um den Nutzer "
+                f"einzuloggen."
+            )
             db.session.commit()
     else:
         flash(f"Ungültige Eingabe: {form.errors}")
 
-    return redirect('/manage_admins')
+    return redirect("/manage_admins")
 
 
-@door_app.route('/delete_admins/<username>', methods=['GET', 'POST'])
-@roles_required('super_admin')
+@door_app.route("/delete_admins/<username>", methods=["GET", "POST"])
+@roles_required("super_admin")
 def delete_admins(username):
     user = security.datastore.find_user(username=username)
     if user is None:
         flash(f"Ungültiger Nutzer {username}")
-        return redirect('/manage_admins')
-    if user.has_role('super_admin'):
-        flash('Super-Admins können nicht gelöscht werden!')
-        return redirect('/manage_admins')
+        return redirect("/manage_admins")
+    if user.has_role("super_admin"):
+        flash("Super-Admins können nicht gelöscht werden!")
+        return redirect("/manage_admins")
     if user.is_active:
-        flash('Aktive Nutzer können nicht gelöscht werden! Bitte den Benutzer zuerst deaktivieren.')
-        return redirect('/manage_admins')
+        flash(
+            "Aktive Nutzer können nicht gelöscht werden! Bitte den Benutzer "
+            "zuerst deaktivieren."
+        )
+        return redirect("/manage_admins")
 
     # set up form for confirming deletion
     form = ConfirmDeleteForm()
     form.name_confirm.data = username
 
-    if request.method == 'GET':
+    if request.method == "GET":
         # return page asking the user to confirm delete
-        return render_template('delete_user.html', username=username, form=form)
+        return render_template("delete_user.html", username=username, form=form)
     elif form.validate():
         security.datastore.delete_user(user)
         flash(f"Benutzer {username} wurde gelöscht.")
-        current_app.logger.info(f"Super admin {current_user.username} deleted admin user {username}")
+        current_app.logger.info(
+            f"Super admin {current_user.username} deleted admin user {username}"
+        )
         db.session.commit()
-        return redirect('/manage_admins')
+        return redirect("/manage_admins")
     else:
-        flash("Der eingegebene Nutzername stimmt nicht überein. Der Benutzer wurde nicht gelöscht!")
-        return redirect('/manage_admins')
+        flash(
+            "Der eingegebene Nutzername stimmt nicht überein. Der Benutzer "
+            "wurde nicht gelöscht!"
+        )
+        return redirect("/manage_admins")
 
 
-@door_app.route('/admin_toggle_active/<username>')
-@roles_required('super_admin')
+@door_app.route("/admin_toggle_active/<username>")
+@roles_required("super_admin")
 def admin_toggle_active(username):
     user = security.datastore.find_user(username=username)
     if user is None:
         flash(f"Ungültiger Nutzer {username}")
-        return redirect('/manage_admins')
-    if user.has_role('super_admin'):
-        flash('Super-Admins können nicht deaktiviert werden!')
-        return redirect('/manage_admins')
+        return redirect("/manage_admins")
+    if user.has_role("super_admin"):
+        flash("Super-Admins können nicht deaktiviert werden!")
+        return redirect("/manage_admins")
     security.datastore.toggle_active(user)
     if user.is_active:
-        current_app.logger.info(f"Super admin {current_user.username} activated access for admin user {username}")
+        current_app.logger.info(
+            f"Super admin {current_user.username} activated access for admin "
+            f"user {username}"
+        )
     else:
-        current_app.logger.info(f"Super admin {current_user.username} deactivated access for admin user {username}")
+        current_app.logger.info(
+            f"Super admin {current_user.username} deactivated access for admin "
+            f"user {username}"
+        )
     db.session.commit()
-    return redirect('/manage_admins')
+    return redirect("/manage_admins")
 
 
-@door_app.route('/promote_admin/<username>')
-@roles_required('super_admin')
+@door_app.route("/promote_admin/<username>")
+@roles_required("super_admin")
 def promote_admin(username):
     user = security.datastore.find_user(username=username)
     if user is None:
         flash(f"Ungültiger Nutzer {username}")
-        return redirect('/manage_admins')
-    if user.has_role('admin'):
-        flash(f'Benutzer {username} hat bereits Admin-Rechte!')
-        return redirect('/manage_admins')
-    security.datastore.add_role_to_user(user, 'admin')
-    current_app.logger.info(f"Super admin {current_user.username} granted admin privileges to user {username}")
+        return redirect("/manage_admins")
+    if user.has_role("admin"):
+        flash(f"Benutzer {username} hat bereits Admin-Rechte!")
+        return redirect("/manage_admins")
+    security.datastore.add_role_to_user(user, "admin")
+    current_app.logger.info(
+        f"Super admin {current_user.username} granted admin privileges to "
+        f"user {username}"
+    )
     db.session.commit()
-    return redirect('/manage_admins')
+    return redirect("/manage_admins")
 
 
-@door_app.route('/demote_admin/<username>')
-@roles_required('super_admin')
+@door_app.route("/demote_admin/<username>")
+@roles_required("super_admin")
 def demote_admin(username):
     user = security.datastore.find_user(username=username)
     if user is None:
         flash(f"Ungültiger Nutzer {username}")
-        return redirect('/manage_admins')
-    if user.has_role('super_admin'):
-        flash(f'Benutzer {username} hat Super-Admin-Rechte und kann nicht '
-              'verändert werden!')
-        return redirect('/manage_admins')
-    if user.has_role('admin'):
-        security.datastore.remove_role_from_user(user, 'admin')
-        current_app.logger.info(f"Super admin {current_user.username} revoked "
-                                f"admin privileges of user {username}")
+        return redirect("/manage_admins")
+    if user.has_role("super_admin"):
+        flash(
+            f"Benutzer {username} hat Super-Admin-Rechte und kann nicht "
+            "verändert werden!"
+        )
+        return redirect("/manage_admins")
+    if user.has_role("admin"):
+        security.datastore.remove_role_from_user(user, "admin")
+        current_app.logger.info(
+            f"Super admin {current_user.username} revoked "
+            f"admin privileges of user {username}"
+        )
         db.session.commit()
     else:
-        flash(f'Benutzer {username} ist bereits kein Admin!')
-    return redirect('/manage_admins')
+        flash(f"Benutzer {username} ist bereits kein Admin!")
+    return redirect("/manage_admins")
 
 
-@door_app.route('/backup_user_datastore')
-@roles_required('super_admin')
+@door_app.route("/backup_user_datastore")
+@roles_required("super_admin")
 def backup_user_datastore():
     # get list of defined admin users for backup
     users = security.datastore.user_model.query.all()
-    user_data = [{'username': u.username, 'email': u.email,
-                  'active': u.is_active, 'password_hash': u.password,
-                  'roles': [r.name for r in u.roles]}
-                 for u in users if not u.has_role('super_admin')]
+    user_data = [
+        {
+            "username": u.username,
+            "email": u.email,
+            "active": u.is_active,
+            "password_hash": u.password,
+            "roles": [r.name for r in u.roles],
+        }
+        for u in users
+        if not u.has_role("super_admin")
+    ]
     try:
         with tempfile.TemporaryDirectory() as tmpdir:
-            file = Path(tmpdir, 'user_data.txt')
+            file = Path(tmpdir, "user_data.txt")
             file.write_text(json.dumps(user_data))
             return send_file(file, as_attachment=True, cache_timeout=-1)
     except Exception as e:
         return str(e)
 
 
-@door_app.route('/restore_user_datastore', methods=['POST'])
-@roles_required('super_admin')
+@door_app.route("/restore_user_datastore", methods=["POST"])
+@roles_required("super_admin")
 def restore_user_datastore():
     # check if the post request has the file part
-    if 'file' not in request.files:
-        flash('Keine Datei ausgewählt!')
+    if "file" not in request.files:
+        flash("Keine Datei ausgewählt!")
         return redirect(request.url)
-    file = request.files['file']
+    file = request.files["file"]
     # if user does not select file, browser also
     # submit an empty part without filename
-    if file.filename == '':
-        flash('Keine Datei ausgewählt!')
-        return redirect('/manage_admins')
+    if file.filename == "":
+        flash("Keine Datei ausgewählt!")
+        return redirect("/manage_admins")
     filename = secure_filename(file.filename)
-    if file and filename.endswith('.txt'):
+    if file and filename.endswith(".txt"):
         data = file.stream.read()
         try:
             # check validity of user data
@@ -226,63 +258,97 @@ def restore_user_datastore():
             valid &= all(type(d) == dict for d in user_data)
             if valid:
                 for d in user_data:
-                    entry_valid = set(d.keys()) == { 'active', 'email', 'password_hash', 'username', 'roles'}
-                    entry_valid &= all(len(d[key]) > 0 for key in ['email', 'password_hash', 'username'])
-                    entry_valid &= type(d['active']) == bool
-                    entry_valid &= type(d['roles']) == list
-                    validate_email(d['email'])
+                    entry_valid = set(d.keys()) == {
+                        "active",
+                        "email",
+                        "password_hash",
+                        "username",
+                        "roles",
+                    }
+                    entry_valid &= all(
+                        len(d[key]) > 0
+                        for key in ["email", "password_hash", "username"]
+                    )
+                    entry_valid &= type(d["active"]) == bool
+                    entry_valid &= type(d["roles"]) == list
+                    validate_email(d["email"])
                     if entry_valid:
-                        existing_user = security.datastore.find_user(username=d['username'], email=d['email'])
+                        existing_user = security.datastore.find_user(
+                            username=d["username"], email=d["email"]
+                        )
                         if existing_user is None:
-                            security.datastore.create_user(username=d['username'], email=d['email'],
-                                                       password=d['password_hash'], active=d['active'],
-                                                       roles=d['roles'])
-                            flash(f"Account für Benutzer '{d['username']} wurde wiederhergestellt.")
+                            security.datastore.create_user(
+                                username=d["username"],
+                                email=d["email"],
+                                password=d["password_hash"],
+                                active=d["active"],
+                                roles=d["roles"],
+                            )
+                            flash(
+                                f"Account für Benutzer '{d['username']} wurde "
+                                f"wiederhergestellt."
+                            )
                         else:
-                            flash(f"Benutzer '{d['username']} existiert bereits. Eintrag wird übersprungen.")
+                            flash(
+                                f"Benutzer '{d['username']} existiert bereits."
+                                f" Eintrag wird übersprungen."
+                            )
                     else:
                         raise ValueError(f"Ungültige Daten für User Entry {d}")
             else:
                 raise ValueError("Admin User Datei hat ungültiges Format.")
         except Exception as e:
             flash(f"Die Datei konnte nicht gelesen werden. Exception: {e}")
-            return redirect('/manage_admins')
+            return redirect("/manage_admins")
         flash("Benutzer aus Datei gelesen.")
         db.session.commit()
     else:
         flash("Ungültige Dateiendung")
-    return redirect('/manage_admins')
+    return redirect("/manage_admins")
 
 
 # main page
-@door_app.route('/')
+@door_app.route("/")
 def door_lock():
-    return render_template('index.html', door_state=current_app.door.state, encoder_position=current_app.door.encoder_position)
+    return render_template(
+        "index.html",
+        door_state=current_app.door.state,
+        encoder_position=current_app.door.encoder_position,
+    )
 
 
 # token overview
-@door_app.route('/tokens')
-@roles_required('admin')
+@door_app.route("/tokens")
+@roles_required("admin")
 def list_tokens():
     tokens = current_app.door.get_tokens()
-    assigned_tokens = {t: data for t, data in tokens.items() if not data['inactive']}
-    inactive_tokens = {t: data for t, data in tokens.items() if data['inactive']}
-    return render_template('tokens.html', assigned_tokens=assigned_tokens, inactive_tokens=inactive_tokens)
+    assigned_tokens = {t: data for t, data in tokens.items()
+                       if not data["inactive"]}
+    inactive_tokens = {t: data for t, data in tokens.items()
+                       if data["inactive"]}
+    return render_template(
+        "tokens.html",
+        assigned_tokens=assigned_tokens,
+        inactive_tokens=inactive_tokens
+    )
 
 
-@door_app.route('/token-log')
-@roles_required('super_admin')
+@door_app.route("/token-log")
+@roles_required("super_admin")
 def token_log():
     log = []
     try:
-        with open(current_app.config['NFC_LOG']) as f:
+        with open(current_app.config["NFC_LOG"]) as f:
             log += f.readlines()
         log.reverse()
-        log = [l.split(' - ') for l in log]
-        return render_template('token_log.html', log=log)
+        log = [l.split(" - ") for l in log]
+        return render_template("token_log.html", log=log)
     except Exception as e:
-        flash(f"NFC logfile {Path(current_app.config['NFC_LOG']).absolute()} konnte nicht gelesen werden. Exception: {e}")
-        return redirect('/')
+        flash(
+            f"NFC logfile {Path(current_app.config['NFC_LOG']).absolute()} "
+            f"konnte nicht gelesen werden. Exception: {e}"
+        )
+        return redirect("/")
 
 
 def store_token(token_data):
@@ -291,69 +357,82 @@ def store_token(token_data):
     This will use the token id and the associated data and create/modify a
     token and store the new token file to disk.
     """
-    token = token_data['token']
+    token = token_data["token"]
     tokens = current_app.door.get_tokens()
-    tokens[token] = {'name': token_data['name'],
-                     'email': token_data['email'],
-                     'valid_thru': token_data['valid_thru'],
-                     'inactive': token_data['inactive'],
-                     'organization': token_data['organization']}
+    tokens[token] = {
+        "name": token_data["name"],
+        "email": token_data["email"],
+        "valid_thru": token_data["valid_thru"],
+        "inactive": token_data["inactive"],
+        "organization": token_data["organization"],
+    }
     try:
         current_app.door.store_tokens(tokens)
-        current_app.logger.info(f"Token {token} stored in database by admin user {current_user.username}")
+        current_app.logger.info(
+            f"Token {token} stored in database by admin user "
+            f"{current_user.username}"
+        )
     except Exception as e:
         flash(f"Error during store_tokens. Exception: {e}")
 
 
 # routes for registering, editing and deleting tokens
-@door_app.route('/register-token', methods=['GET', 'POST'])
-@roles_required('admin')
+@door_app.route("/register-token", methods=["GET", "POST"])
+@roles_required("admin")
 def register():
     """Register new token for locking and unlocking the door.
 
-    This route displays the most recently scanned invalid token as reported in the logfile and provides a form for
-    entering user info (name, email, valid thru date (optional)) for the new token.
+    This route displays the most recently scanned invalid token as reported in
+    the logfile and provides a form for entering user info (name, email, valid
+    thru date (optional)) for the new token.
 
-    If the route is called via POST the provided form data is checked and if the check succeeds the /store-token route
-    will be called which adds the new token to the database.
+    If the route is called via POST the provided form data is checked and if
+    the check succeeds the /store-token route will be called which adds the new
+    token to the database.
     """
     token = current_app.door.get_most_recent_token()
 
     recent_token = {}
-    if {'token', 'timestamp'}.issubset(set(token.keys())):
-        dt = datetime.utcnow() - token['timestamp']
+    if {"token", "timestamp"}.issubset(set(token.keys())):
+        dt = datetime.utcnow() - token["timestamp"]
         if dt < timedelta(minutes=10):
             recent_token = token
-            recent_token['timedelta_minutes'] = int(dt.total_seconds() / 60.0)
+            recent_token["timedelta_minutes"] = int(dt.total_seconds() / 60.0)
 
     form = TokenForm()
-    if request.method == 'GET':
-        # set default valid thru date to today to make sure form validity check passes
+    if request.method == "GET":
+        # set default valid thru date to today to make sure form validity check
+        # passes
         # (will not be used if limited validity is disabled)
         form.valid_thru.data = date.today()
-    elif request.method == 'POST' and form.validate():
+    elif request.method == "POST" and form.validate():
         token_data = {
-            'token': current_app.door.get_most_recent_token()['token'],
-            'name': form.name.data, 'email': form.email.data,
-            'organization': form.organization.data,
-            'inactive': not form.active.data,
-            'valid_thru': form.valid_thru.data.isoformat() if form.limit_validity.data else ''
+            "token": current_app.door.get_most_recent_token()["token"],
+            "name": form.name.data,
+            "email": form.email.data,
+            "organization": form.organization.data,
+            "inactive": not form.active.data,
+            "valid_thru": form.valid_thru.data.isoformat()
+            if form.limit_validity.data
+            else "",
         }
         store_token(token_data)
-        return redirect('/tokens')
+        return redirect("/tokens")
     else:
-        flash(f'Token konnte nicht registiert werden. Fehler: {form.errors}')
-    return render_template('register.html', token=recent_token, form=form)
+        flash(f"Token konnte nicht registiert werden. Fehler: {form.errors}")
+    return render_template("register.html", token=recent_token, form=form)
 
 
-@door_app.route('/edit-token/<token>', methods=['GET', 'POST'])
-@roles_required('admin')
+@door_app.route("/edit-token/<token>", methods=["GET", "POST"])
+@roles_required("admin")
 def edit_token(token):
-    """Edit data in the token file (name, email, valid_thru date, active/inactive).
+    """Edit data in the token file (name, email, valid_thru date, active).
 
-    If the route is accessed via GET it will provide a form for editing the currently stored data for the user.
-    If the route is accessed via POST it will check if the form data is good and then store the modified user data in
-    the database (by redirecting to the /store-token route)
+    If the route is accessed via GET it will provide a form for editing the
+    currently stored data for the user.
+    If the route is accessed via POST it will check if the form data is good
+    and then store the modified user data in the database (by redirecting to
+    the /store-token route)
 
     Parameters
     ----------
@@ -361,51 +440,60 @@ def edit_token(token):
         The token for which data should be edited.
     """
     form = TokenForm(request.form)
-    form.dsgvo.validators = []  # we skip the validation of the DSGVO checkbox here because we assume the user agreed
-    # to it before
-    if request.method == 'GET':
+    form.dsgvo.validators = (
+        []
+    )
+    # we skip the validation of the DSGVO checkbox here because we assume
+    # the user agreed to it before
+    if request.method == "GET":
         tokens = current_app.door.get_tokens()
         if token in tokens:
             # set default for form according to values from the token file
             et = tokens[token]
-            form.active.data = not et['inactive']
-            form.name.data = et['name'] if et['name'] else ''
-            form.email.data = et['email'] if et['email'] else ''
-            form.organization.data = et['organization'] if et['organization'] else ''
+            form.active.data = not et["inactive"]
+            form.name.data = et["name"] if et["name"] else ""
+            form.email.data = et["email"] if et["email"] else ""
+            form.organization.data = et["organization"] \
+                if et["organization"] else ""
 
-            # for the valid thru date we use today's date in case there is not valid date in the database
+            # for the valid thru date we use today's date in case there is not
+            # valid date in the database
             try:
-                form.valid_thru.data = date.fromisoformat(et['valid_thru'])
+                form.valid_thru.data = date.fromisoformat(et["valid_thru"])
                 form.limit_validity.data = True
             except Exception:
                 form.valid_thru.data = date.today()
 
-            return render_template('edit.html', token=token, form=form)
+            return render_template("edit.html", token=token, form=form)
         else:
-            # flash an error message if the route is accessed with an invalid token
-            flash(f'Ungültiger Token {token}!')
-            return redirect('/tokens')
-    elif request.method == 'POST':
+            # flash an error message if the route is accessed with an invalid
+            # token
+            flash(f"Ungültiger Token {token}!")
+            return redirect("/tokens")
+    elif request.method == "POST":
         if form.validate():
             # store data in token_data cookie
-            token_data = {'token': token,
-                          'name': form.name.data,
-                          'organization': form.organization.data,
-                          'email': form.email.data,
-                          'inactive': not form.active.data,
-                          'valid_thru': form.valid_thru.data.isoformat() if form.limit_validity.data else ''
-                          }
+            token_data = {
+                "token": token,
+                "name": form.name.data,
+                "organization": form.organization.data,
+                "email": form.email.data,
+                "inactive": not form.active.data,
+                "valid_thru": form.valid_thru.data.isoformat()
+                if form.limit_validity.data
+                else "",
+            }
             store_token(token_data)
-            return redirect('/tokens')
+            return redirect("/tokens")
         else:
-            flash(f'Token konnte nicht editiert werden. Fehler: {form.errors}')
-            return render_template('edit.html', token=token, form=form)
+            flash(f"Token konnte nicht editiert werden. Fehler: {form.errors}")
+            return render_template("edit.html", token=token, form=form)
 
 
-@door_app.route('/delete-token/<token>', methods=['GET', 'POST'])
-@roles_required('admin')
+@door_app.route("/delete-token/<token>", methods=["GET", "POST"])
+@roles_required("admin")
 def delete_token(token):
-    """Delete the given token from the token file and store the new token file to disk
+    """Delete the given token from the token file and store the new token file.
 
     Parameters
     ----------
@@ -415,29 +503,31 @@ def delete_token(token):
     tokens = current_app.door.get_tokens()
 
     if token not in tokens:
-        flash(f'Ungültiger Token {token} für Löschung.')
-        return redirect('/tokens')
+        flash(f"Ungültiger Token {token} für Löschung.")
+        return redirect("/tokens")
 
     token_to_delete = tokens[token]
 
     # set up form for confirming deletion
     form = ConfirmDeleteForm()
-    form.name_confirm.data = token_to_delete['name']
+    form.name_confirm.data = token_to_delete["name"]
 
-    if request.method == 'GET':
+    if request.method == "GET":
         # return page asking the user to confirm delete
-        return render_template('delete.html', token=token_to_delete, form=form)
+        return render_template("delete.html", token=token_to_delete, form=form)
     elif form.validate():
         # form validation successful -> can delete the token
         tokens.pop(token)
         try:
             current_app.door.store_tokens(tokens)
-            current_app.logger.info(f"Token {token} was deleted from database "
-                                    f"by admin user {current_user.username}")
+            current_app.logger.info(
+                f"Token {token} was deleted from database "
+                f"by admin user {current_user.username}"
+            )
         except Exception as e:
             flash(f"Error during store_tokens. Exception: {e}")
         flash(f"Token {token} wurde gelöscht!")
-        return redirect('/tokens')
+        return redirect("/tokens")
     else:
         # form validation failed -> return to token overview and flash message
         flash(
@@ -445,13 +535,15 @@ def delete_token(token):
             f"Der Token {token} von {token_to_delete['name']} wurde nicht "
             "gelöscht."
         )
-        return redirect('/tokens')
+        return redirect("/tokens")
 
 
-@door_app.route('/deactivate-token/<token>')
-@roles_required('admin')
+@door_app.route("/deactivate-token/<token>")
+@roles_required("admin")
 def deactivate_token(token):
-    """Deactivate access for the given token. This updates the token file on disk.
+    """Deactivate access for the given token.
+
+    This updates the token file on disk.
 
     Parameters
     ----------
@@ -461,50 +553,54 @@ def deactivate_token(token):
     tokens = current_app.door.get_tokens()
 
     if token not in tokens:
-        flash(f'Ungültiger Token {token} für Deaktivierung.')
-        return redirect('/tokens')
+        flash(f"Ungültiger Token {token} für Deaktivierung.")
+        return redirect("/tokens")
 
-    tokens[token]['inactive'] = True
+    tokens[token]["inactive"] = True
     try:
         current_app.door.store_tokens(tokens)
-        current_app.logger.info(f"Token {token} deactivated by admin user {current_user.username}")
+        current_app.logger.info(
+            f"Token {token} deactivated by admin user {current_user.username}"
+        )
     except Exception as e:
         flash(f"Error during store_tokens. Exception: {e}")
-    return redirect('/tokens')
+    return redirect("/tokens")
 
 
-@door_app.route('/backup_tokens')
-@roles_required('admin')
+@door_app.route("/backup_tokens")
+@roles_required("admin")
 def backup_tokens():
     # get list of defined admin users for backup
     tokens = current_app.door.get_tokens()
     try:
         with tempfile.TemporaryDirectory() as tmpdir:
-            file = Path(tmpdir, 'token_data.txt')
+            file = Path(tmpdir, "token_data.txt")
             file.write_text(json.dumps(tokens))
             return send_file(file, as_attachment=True, cache_timeout=-1)
     except Exception as e:
         return str(e)
 
 
-@door_app.route('/open')
+@door_app.route("/open")
 @auth_required()
 def open_door():
     try:
         current_app.door.open_door(user=current_user.username)
-        current_app.logger.info(f"Door opened by admin user {current_user.username}")
+        current_app.logger.info(f"Door opened by admin user "
+                                f"{current_user.username}")
     except Exception as e:
-        flash(f'Could not open door. Exception: {e}')
-    return redirect('/')
+        flash(f"Could not open door. Exception: {e}")
+    return redirect("/")
 
 
 # routes for opening and closing the door via the web interface
-@door_app.route('/close')
+@door_app.route("/close")
 @auth_required()
 def close_door():
     try:
         current_app.door.close_door(user=current_user.username)
-        current_app.logger.info(f"Door closed by admin user {current_user.username}")
+        current_app.logger.info(f"Door closed by admin user "
+                                f"{current_user.username}")
     except Exception as e:
-        flash(f'Could not close door. Exception: {e}')
-    return redirect('/')
+        flash(f"Could not close door. Exception: {e}")
+    return redirect("/")