Overhauled app settings implementation to remove redundancy of definitions. Additionally, re-factored settings initialization code to allow for every setting to be defined by environment variable for both bare metal and Docker container deployments.

2024-12-04 11:05:32 +00:00 · 2023-04-14 07:12:02 -04:00 · 2023-04-14 07:12:02 -04:00 · c842d09195
commit c842d09195
parent 9ddfde02b8
8 changed files with 734 additions and 704 deletions
--- a/configs/docker_config.py
+++ b/configs/docker_config.py
@ -1,151 +1,2 @@
-# import everything from environment variables
-import os
-import sys
-import json
-
-# Defaults for Docker image
-BIND_ADDRESS = '0.0.0.0'
 PORT = 80
-SERVER_EXTERNAL_SSL = os.getenv('SERVER_EXTERNAL_SSL', True)
 SQLALCHEMY_DATABASE_URI = 'sqlite:////data/powerdns-admin.db'
-SESSION_COOKIE_SAMESITE = 'Lax'
-CSRF_COOKIE_HTTPONLY = True
-SESSION_TYPE = 'sqlalchemy'
-
-legal_envvars = (
-    'SECRET_KEY',
-    'OIDC_OAUTH_ENABLED',
-    'OIDC_OAUTH_KEY',
-    'OIDC_OAUTH_SECRET',
-    'OIDC_OAUTH_API_URL',
-    'OIDC_OAUTH_TOKEN_URL',
-    'OIDC_OAUTH_AUTHORIZE_URL',
-    'OIDC_OAUTH_METADATA_URL',
-    'OIDC_OAUTH_LOGOUT_URL',
-    'OIDC_OAUTH_SCOPE',
-    'OIDC_OAUTH_USERNAME',
-    'OIDC_OAUTH_FIRSTNAME',
-    'OIDC_OAUTH_LAST_NAME',
-    'OIDC_OAUTH_EMAIL',
-    'BIND_ADDRESS',
-    'PORT',
-    'SERVER_EXTERNAL_SSL',
-    'LOG_LEVEL',
-    'SALT',
-    'SQLALCHEMY_TRACK_MODIFICATIONS',
-    'SQLALCHEMY_DATABASE_URI',
-    'SQLALCHEMY_ENGINE_OPTIONS',
-    'MAIL_SERVER',
-    'MAIL_PORT',
-    'MAIL_DEBUG',
-    'MAIL_USE_TLS',
-    'MAIL_USE_SSL',
-    'MAIL_USERNAME',
-    'MAIL_PASSWORD',
-    'MAIL_DEFAULT_SENDER',
-    'SAML_ENABLED',
-    'SAML_DEBUG',
-    'SAML_PATH',
-    'SAML_METADATA_URL',
-    'SAML_METADATA_CACHE_LIFETIME',
-    'SAML_IDP_SSO_BINDING',
-    'SAML_IDP_ENTITY_ID',
-    'SAML_NAMEID_FORMAT',
-    'SAML_ATTRIBUTE_EMAIL',
-    'SAML_ATTRIBUTE_GIVENNAME',
-    'SAML_ATTRIBUTE_SURNAME',
-    'SAML_ATTRIBUTE_NAME',
-    'SAML_ATTRIBUTE_USERNAME',
-    'SAML_ATTRIBUTE_ADMIN',
-    'SAML_ATTRIBUTE_GROUP',
-    'SAML_GROUP_ADMIN_NAME',
-    'SAML_GROUP_TO_ACCOUNT_MAPPING',
-    'SAML_ATTRIBUTE_ACCOUNT',
-    'SAML_SP_ENTITY_ID',
-    'SAML_SP_CONTACT_NAME',
-    'SAML_SP_CONTACT_MAIL',
-    'SAML_SIGN_REQUEST',
-    'SAML_WANT_MESSAGE_SIGNED',
-    'SAML_LOGOUT',
-    'SAML_LOGOUT_URL',
-    'SAML_ASSERTION_ENCRYPTED',
-    'REMOTE_USER_LOGOUT_URL',
-    'REMOTE_USER_COOKIES',
-    'SIGNUP_ENABLED',
-    'LOCAL_DB_ENABLED',
-    'LDAP_ENABLED',
-    'SAML_CERT',
-    'SAML_KEY',
-    'SESSION_TYPE',
-    'SESSION_COOKIE_SECURE',
-    'CSRF_COOKIE_SECURE',
-    'CAPTCHA_ENABLE',
-)
-
-legal_envvars_int = ('PORT', 'MAIL_PORT', 'SAML_METADATA_CACHE_LIFETIME')
-
-legal_envvars_bool = (
-    'SQLALCHEMY_TRACK_MODIFICATIONS',
-    'HSTS_ENABLED',
-    'MAIL_DEBUG',
-    'MAIL_USE_TLS',
-    'MAIL_USE_SSL',
-    'OIDC_OAUTH_ENABLED',
-    'SAML_ENABLED',
-    'SAML_DEBUG',
-    'SAML_SIGN_REQUEST',
-    'SAML_WANT_MESSAGE_SIGNED',
-    'SAML_LOGOUT',
-    'SAML_ASSERTION_ENCRYPTED',
-    'REMOTE_USER_ENABLED',
-    'SIGNUP_ENABLED',
-    'LOCAL_DB_ENABLED',
-    'LDAP_ENABLED',
-    'SESSION_COOKIE_SECURE',
-    'CSRF_COOKIE_SECURE',
-    'CAPTCHA_ENABLE',
-    'SERVER_EXTERNAL_SSL',
-)
-
-legal_envvars_dict = (
-    'SQLALCHEMY_ENGINE_OPTIONS',
-)
-
-def str2bool(v):
-    return v.lower() in ("true", "yes", "1")
-
-
-def dictfromstr(v, ret):
-    try:
-        return json.loads(ret)
-    except Exception as e:
-        print('Cannot parse json {} for variable {}'.format(ret, v))
-        print(e)
-        raise ValueError
-
-
-for v in legal_envvars:
-
-    ret = None
-    # _FILE suffix will allow to read value from file, useful for Docker containers.
-    # secrets feature
-    if v + '_FILE' in os.environ:
-        if v in os.environ:
-            raise AttributeError(
-                "Both {} and {} are set but are exclusive.".format(
-                    v, v + '_FILE'))
-        with open(os.environ[v + '_FILE']) as f:
-            ret = f.read()
-        f.close()
-
-    elif v in os.environ:
-        ret = os.environ[v]
-
-    if ret is not None:
-        if v in legal_envvars_bool:
-            ret = str2bool(ret)
-        if v in legal_envvars_int:
-            ret = int(ret)
-        if v in legal_envvars_dict:
-            ret = dictfromstr(v, ret)
-        sys.modules[__name__].__dict__[v] = ret
--- a/powerdnsadmin/init.py
+++ b/powerdnsadmin/init.py
@ -4,11 +4,11 @@ from flask import Flask
 from flask_mail import Mail
 from werkzeug.middleware.proxy_fix import ProxyFix
 from flask_session import Session
-
 from .lib import utils


 def create_app(config=None):
+    from powerdnsadmin.lib.settings import AppSettings
    from . import models, routes, services
    from .assets import assets
    app = Flask(__name__)
@ -50,6 +50,9 @@ def create_app(config=None):
        elif config.endswith('.py'):
            app.config.from_pyfile(config)

+    # Load any settings defined with environment variables
+    AppSettings.load_environment(app)
+
    # HSTS
    if app.config.get('HSTS_ENABLED'):
        from flask_sslify import SSLify
--- a/powerdnsadmin/decorators.py
+++ b/powerdnsadmin/decorators.py
@ -13,6 +13,7 @@ def admin_role_required(f):
    """
    Grant access if user is in Administrator role
    """
+
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if current_user.role.name != 'Administrator':
@ -26,6 +27,7 @@ def operator_role_required(f):
    """
    Grant access if user is in Operator role or higher
    """
+
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if current_user.role.name not in ['Administrator', 'Operator']:
@ -39,6 +41,7 @@ def history_access_required(f):
    """
    Grant access if user is in Operator role or higher, or Users can view history
    """
+
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if current_user.role.name not in [
@ -57,6 +60,7 @@ def can_access_domain(f):
        - user is in granted Account, or
        - user is in granted Domain
    """
+
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if current_user.role.name not in ['Administrator', 'Operator']:
@ -83,6 +87,7 @@ def can_configure_dnssec(f):
        - user is in Operator role or higher, or
        - dnssec_admins_only is off
    """
+
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if current_user.role.name not in [
@ -94,12 +99,14 @@ def can_configure_dnssec(f):

    return decorated_function

+
 def can_remove_domain(f):
    """
    Grant access if:
        - user is in Operator role or higher, or
        - allow_user_remove_domain is on
    """
+
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if current_user.role.name not in [
@ -111,13 +118,13 @@ def can_remove_domain(f):
    return decorated_function


-
 def can_create_domain(f):
    """
    Grant access if:
        - user is in Operator role or higher, or
        - allow_user_create_domain is on
    """
+
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if current_user.role.name not in [
@ -144,11 +151,12 @@ def api_basic_auth(f):

        # Remove "Basic " from the header value
        auth_header = auth_header[6:]
+        auth_components = []

        try:
            auth_header = str(base64.b64decode(auth_header), 'utf-8')
-            # NK: We use auth_components here as we don't know if we'll have a :, we split it maximum 1 times to grab the
-            #     username, the rest of the string would be the password.
+            # NK: We use auth_components here as we don't know if we'll have a colon,
+            # we split it maximum 1 times to grab the username, the rest of the string would be the password.
            auth_components = auth_header.split(':', maxsplit=1)
        except (binascii.Error, UnicodeDecodeError) as e:
            current_app.logger.error(
@ -211,6 +219,7 @@ def callback_if_request_body_contains_key(callback, http_methods=[], keys=[]):
    If request body contains one or more of specified keys, call
    :param callback
    """
+
    def decorator(f):
        @wraps(f)
        def decorated_function(*args, **kwargs):
@ -220,7 +229,9 @@ def callback_if_request_body_contains_key(callback, http_methods=[], keys=[]):
            ):
                callback(*args, **kwargs)
            return f(*args, **kwargs)
+
        return decorated_function
+
    return decorator


@ -255,7 +266,9 @@ def api_role_can(action, roles=None, allow_self=False):
                "User {} with role {} does not have enough privileges to {}"
            ).format(current_user.username, current_user.role.name, action)
            raise NotEnoughPrivileges(message=msg)
+
        return decorated_function
+
    return decorator


@ -265,6 +278,7 @@ def api_can_create_domain(f):
        - user is in Operator role or higher, or
        - allow_user_create_domain is on
    """
+
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if current_user.role.name not in [
@ -294,6 +308,7 @@ def apikey_can_create_domain(f):
        - deny_domain_override is off or
        - override_domain is true (from request)
    """
+
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if g.apikey.role.name not in [
@ -320,6 +335,7 @@ def apikey_can_remove_domain(http_methods=[]):
        - user is in Operator role or higher, or
        - allow_user_remove_domain is on
    """
+
    def decorator(f):
        @wraps(f)
        def decorated_function(*args, **kwargs):
@ -333,7 +349,9 @@ def apikey_can_remove_domain(http_methods=[]):
                current_app.logger.error(msg.format(g.apikey.id))
                raise NotEnoughPrivileges()
            return f(*args, **kwargs)
+
        return decorated_function
+
    return decorator


@ -341,6 +359,7 @@ def apikey_is_admin(f):
    """
    Grant access if user is in Administrator role
    """
+
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if g.apikey.role.name != 'Administrator':
@ -358,6 +377,7 @@ def apikey_can_access_domain(f):
        - user has Operator role or higher, or
        - user has explicitly been granted access to domain
    """
+
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if g.apikey.role.name not in ['Administrator', 'Operator']:
@ -382,6 +402,7 @@ def apikey_can_configure_dnssec(http_methods=[]):
        - user is in Operator role or higher, or
        - dnssec_admins_only is off
    """
+
    def decorator(f=None):
        @wraps(f)
        def decorated_function(*args, **kwargs):
@ -395,9 +416,12 @@ def apikey_can_configure_dnssec(http_methods=[]):
                current_app.logger.error(msg.format(g.apikey.id))
                raise DomainAccessForbidden(message=msg)
            return f(*args, **kwargs) if f else None
+
        return decorated_function
+
    return decorator

+
 def allowed_record_types(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
@ -423,6 +447,7 @@ def allowed_record_types(f):

    return decorated_function

+
 def allowed_record_ttl(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
@ -436,7 +461,7 @@ def allowed_record_ttl(f):
            return f(*args, **kwargs)

        allowed_ttls = Setting().get_ttl_options()
-        allowed_numeric_ttls = [ ttl[0] for ttl in allowed_ttls ]
+        allowed_numeric_ttls = [ttl[0] for ttl in allowed_ttls]
        content = request.get_json()
        try:
            for record in content['rrsets']:
@ -497,6 +522,7 @@ def dyndns_login_required(f):

    return decorated_function

+
 def apikey_or_basic_auth(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
@ -505,4 +531,5 @@ def apikey_or_basic_auth(f):
            return apikey_auth(f)(*args, **kwargs)
        else:
            return api_basic_auth(f)(*args, **kwargs)
+
    return decorated_function
--- a/powerdnsadmin/default_config.py
+++ b/powerdnsadmin/default_config.py
@ -1,44 +1,32 @@
 import os
-import urllib.parse
+
 basedir = os.path.abspath(os.path.dirname(__file__))

-### BASIC APP CONFIG
-SALT = '$2b$12$yLUMTIfl21FKJQpTkRQXCu'
-SECRET_KEY = 'e951e5a1f4b94151b360f47edf596dd2'
 BIND_ADDRESS = '0.0.0.0'
-PORT = 9191
-HSTS_ENABLED = False
-SERVER_EXTERNAL_SSL = os.getenv('SERVER_EXTERNAL_SSL', True)
-
-SESSION_TYPE = 'sqlalchemy'
-SESSION_COOKIE_SAMESITE = 'Lax'
-CSRF_COOKIE_HTTPONLY = True
-
-#CAPTCHA Config
 CAPTCHA_ENABLE = True
-CAPTCHA_LENGTH = 6
-CAPTCHA_WIDTH = 160
 CAPTCHA_HEIGHT = 60
+CAPTCHA_LENGTH = 6
 CAPTCHA_SESSION_KEY = 'captcha_image'
-
-### DATABASE CONFIG
-SQLA_DB_USER = 'pda'
-SQLA_DB_PASSWORD = 'changeme'
-SQLA_DB_HOST = '127.0.0.1'
-SQLA_DB_NAME = 'pda'
+CAPTCHA_WIDTH = 160
+CSRF_COOKIE_HTTPONLY = True
+HSTS_ENABLED = False
+PORT = 9191
+SALT = '$2b$12$yLUMTIfl21FKJQpTkRQXCu'
+SAML_ASSERTION_ENCRYPTED = True
+SAML_ENABLED = False
+SECRET_KEY = 'e951e5a1f4b94151b360f47edf596dd2'
+SERVER_EXTERNAL_SSL = os.getenv('SERVER_EXTERNAL_SSL', True)
+SESSION_COOKIE_SAMESITE = 'Lax'
+SESSION_TYPE = 'sqlalchemy'
+SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(basedir, 'pdns.db')
 SQLALCHEMY_TRACK_MODIFICATIONS = True
-
-### DATABASE - MySQL
+# SQLA_DB_USER = 'pda'
+# SQLA_DB_PASSWORD = 'changeme'
+# SQLA_DB_HOST = '127.0.0.1'
+# SQLA_DB_NAME = 'pda'
 # SQLALCHEMY_DATABASE_URI = 'mysql://{}:{}@{}/{}'.format(
 #     urllib.parse.quote_plus(SQLA_DB_USER),
 #     urllib.parse.quote_plus(SQLA_DB_PASSWORD),
 #     SQLA_DB_HOST,
 #     SQLA_DB_NAME
 # )
-
-### DATABASE - SQLite
-SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(basedir, 'pdns.db')
-
-# SAML Authnetication
-SAML_ENABLED = False
-SAML_ASSERTION_ENCRYPTED = True
--- a/powerdnsadmin/lib/settings.py
+++ b/powerdnsadmin/lib/settings.py
@ -0,0 +1,629 @@
+import os
+from pathlib import Path
+
+basedir = os.path.abspath(Path(os.path.dirname(__file__)).parent)
+
+class AppSettings(object):
+
+    defaults = {
+        # Flask Settings
+        'bind_address': '0.0.0.0',
+        'csrf_cookie_secure': False,
+        'log_level': 'WARNING',
+        'port': 9191,
+        'salt': '$2b$12$yLUMTIfl21FKJQpTkRQXCu',
+        'secret_key': 'e951e5a1f4b94151b360f47edf596dd2',
+        'session_cookie_secure': False,
+        'session_type': 'sqlalchemy',
+        'sqlalchemy_track_modifications': True,
+        'sqlalchemy_database_uri': 'sqlite:///' + os.path.join(basedir, 'pdns.db'),
+        'sqlalchemy_engine_options': {},
+
+        # General Settings
+        'captcha_enable': True,
+        'captcha_height': 60,
+        'captcha_length': 6,
+        'captcha_session_key': 'captcha_image',
+        'captcha_width': 160,
+        'mail_server': 'localhost',
+        'mail_port': 25,
+        'mail_debug': False,
+        'mail_use_ssl': False,
+        'mail_use_tls': False,
+        'mail_username': '',
+        'mail_password': '',
+        'mail_default_sender': '',
+        'remote_user_enabled': False,
+        'remote_user_cookies': [],
+        'remote_user_logout_url': '',
+        'server_external_ssl': True,
+        'maintenance': False,
+        'fullscreen_layout': True,
+        'record_helper': True,
+        'login_ldap_first': True,
+        'default_record_table_size': 15,
+        'default_domain_table_size': 10,
+        'auto_ptr': False,
+        'record_quick_edit': True,
+        'pretty_ipv6_ptr': False,
+        'dnssec_admins_only': False,
+        'allow_user_create_domain': False,
+        'allow_user_remove_domain': False,
+        'allow_user_view_history': False,
+        'custom_history_header': '',
+        'delete_sso_accounts': False,
+        'bg_domain_updates': False,
+        'enable_api_rr_history': True,
+        'preserve_history': False,
+        'site_name': 'PowerDNS-Admin',
+        'site_url': 'http://localhost:9191',
+        'session_timeout': 10,
+        'warn_session_timeout': True,
+        'pdns_api_url': '',
+        'pdns_api_key': '',
+        'pdns_api_timeout': 30,
+        'pdns_version': '4.1.1',
+        'verify_ssl_connections': True,
+        'verify_user_email': False,
+        'enforce_api_ttl': False,
+        'ttl_options': '1 minute,5 minutes,30 minutes,60 minutes,24 hours',
+        'otp_field_enabled': True,
+        'custom_css': '',
+        'otp_force': False,
+        'max_history_records': 1000,
+        'deny_domain_override': False,
+        'account_name_extra_chars': False,
+        'gravatar_enabled': False,
+
+        # Local Authentication Settings
+        'local_db_enabled': True,
+        'signup_enabled': True,
+        'pwd_enforce_characters': False,
+        'pwd_min_len': 10,
+        'pwd_min_lowercase': 3,
+        'pwd_min_uppercase': 2,
+        'pwd_min_digits': 2,
+        'pwd_min_special': 1,
+        'pwd_enforce_complexity': False,
+        'pwd_min_complexity': 11,
+
+        # LDAP Authentication Settings
+        'ldap_enabled': False,
+        'ldap_type': 'ldap',
+        'ldap_uri': '',
+        'ldap_base_dn': '',
+        'ldap_admin_username': '',
+        'ldap_admin_password': '',
+        'ldap_domain': '',
+        'ldap_filter_basic': '',
+        'ldap_filter_username': '',
+        'ldap_filter_group': '',
+        'ldap_filter_groupname': '',
+        'ldap_sg_enabled': False,
+        'ldap_admin_group': '',
+        'ldap_operator_group': '',
+        'ldap_user_group': '',
+        'autoprovisioning': False,
+        'autoprovisioning_attribute': '',
+        'urn_value': '',
+        'purge': False,
+
+        # Google OAuth Settings
+        'google_oauth_enabled': False,
+        'google_oauth_client_id': '',
+        'google_oauth_client_secret': '',
+        'google_oauth_scope': 'openid email profile',
+        'google_base_url': 'https://www.googleapis.com/oauth2/v3/',
+        'google_oauth_auto_configure': True,
+        'google_oauth_metadata_url': 'https://accounts.google.com/.well-known/openid-configuration',
+        'google_token_url': 'https://oauth2.googleapis.com/token',
+        'google_authorize_url': 'https://accounts.google.com/o/oauth2/v2/auth',
+
+        # GitHub OAuth Settings
+        'github_oauth_enabled': False,
+        'github_oauth_key': '',
+        'github_oauth_secret': '',
+        'github_oauth_scope': 'email',
+        'github_oauth_api_url': 'https://api.github.com/user',
+        'github_oauth_auto_configure': False,
+        'github_oauth_metadata_url': '',
+        'github_oauth_token_url': 'https://github.com/login/oauth/access_token',
+        'github_oauth_authorize_url': 'https://github.com/login/oauth/authorize',
+
+        # Azure OAuth Settings
+        'azure_oauth_enabled': False,
+        'azure_oauth_key': '',
+        'azure_oauth_secret': '',
+        'azure_oauth_scope': 'User.Read openid email profile',
+        'azure_oauth_api_url': 'https://graph.microsoft.com/v1.0/',
+        'azure_oauth_auto_configure': True,
+        'azure_oauth_metadata_url': '',
+        'azure_oauth_token_url': '',
+        'azure_oauth_authorize_url': '',
+        'azure_sg_enabled': False,
+        'azure_admin_group': '',
+        'azure_operator_group': '',
+        'azure_user_group': '',
+        'azure_group_accounts_enabled': False,
+        'azure_group_accounts_name': 'displayName',
+        'azure_group_accounts_name_re': '',
+        'azure_group_accounts_description': 'description',
+        'azure_group_accounts_description_re': '',
+
+        # OIDC OAuth Settings
+        'oidc_oauth_enabled': False,
+        'oidc_oauth_key': '',
+        'oidc_oauth_secret': '',
+        'oidc_oauth_scope': 'email',
+        'oidc_oauth_api_url': '',
+        'oidc_oauth_auto_configure': True,
+        'oidc_oauth_metadata_url': '',
+        'oidc_oauth_token_url': '',
+        'oidc_oauth_authorize_url': '',
+        'oidc_oauth_logout_url': '',
+        'oidc_oauth_username': 'preferred_username',
+        'oidc_oauth_email': 'email',
+        'oidc_oauth_firstname': 'given_name',
+        'oidc_oauth_last_name': 'family_name',
+        'oidc_oauth_account_name_property': '',
+        'oidc_oauth_account_description_property': '',
+
+        # SAML Authentication Settings
+        'saml_enabled': False,
+        'saml_debug': False,
+        'saml_path': os.path.join(basedir, 'saml'),
+        'saml_metadata_url': None,
+        'saml_metadata_cache_lifetime': 1,
+        'saml_idp_sso_binding': 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect',
+        'saml_idp_entity_id': None,
+        'saml_nameid_format': None,
+        'saml_attribute_account': None,
+        'saml_attribute_email': 'email',
+        'saml_attribute_givenname': 'givenname',
+        'saml_attribute_surname': 'surname',
+        'saml_attribute_name': None,
+        'saml_attribute_username': None,
+        'saml_attribute_admin': None,
+        'saml_attribute_group': None,
+        'saml_group_admin_name': None,
+        'saml_group_operator_name': None,
+        'saml_group_to_account_mapping': None,
+        'saml_sp_entity_id': None,
+        'saml_sp_contact_name': None,
+        'saml_sp_contact_mail': None,
+        'saml_sign_request': False,
+        'saml_want_message_signed': True,
+        'saml_logout': True,
+        'saml_logout_url': None,
+        'saml_assertion_encrypted': True,
+        'saml_cert': None,
+        'saml_key': None,
+
+        # Zone Record Settings
+        'forward_records_allow_edit': {
+            'A': True,
+            'AAAA': True,
+            'AFSDB': False,
+            'ALIAS': False,
+            'CAA': True,
+            'CERT': False,
+            'CDNSKEY': False,
+            'CDS': False,
+            'CNAME': True,
+            'DNSKEY': False,
+            'DNAME': False,
+            'DS': False,
+            'HINFO': False,
+            'KEY': False,
+            'LOC': True,
+            'LUA': False,
+            'MX': True,
+            'NAPTR': False,
+            'NS': True,
+            'NSEC': False,
+            'NSEC3': False,
+            'NSEC3PARAM': False,
+            'OPENPGPKEY': False,
+            'PTR': True,
+            'RP': False,
+            'RRSIG': False,
+            'SOA': False,
+            'SPF': True,
+            'SSHFP': False,
+            'SRV': True,
+            'TKEY': False,
+            'TSIG': False,
+            'TLSA': False,
+            'SMIMEA': False,
+            'TXT': True,
+            'URI': False
+        },
+        'reverse_records_allow_edit': {
+            'A': False,
+            'AAAA': False,
+            'AFSDB': False,
+            'ALIAS': False,
+            'CAA': False,
+            'CERT': False,
+            'CDNSKEY': False,
+            'CDS': False,
+            'CNAME': False,
+            'DNSKEY': False,
+            'DNAME': False,
+            'DS': False,
+            'HINFO': False,
+            'KEY': False,
+            'LOC': True,
+            'LUA': False,
+            'MX': False,
+            'NAPTR': False,
+            'NS': True,
+            'NSEC': False,
+            'NSEC3': False,
+            'NSEC3PARAM': False,
+            'OPENPGPKEY': False,
+            'PTR': True,
+            'RP': False,
+            'RRSIG': False,
+            'SOA': False,
+            'SPF': False,
+            'SSHFP': False,
+            'SRV': False,
+            'TKEY': False,
+            'TSIG': False,
+            'TLSA': False,
+            'SMIMEA': False,
+            'TXT': True,
+            'URI': False
+        },
+    }
+
+    types = {
+        # Flask Settings
+        'bind_address': str,
+        'csrf_cookie_secure': bool,
+        'log_level': str,
+        'port': int,
+        'salt': str,
+        'secret_key': str,
+        'session_cookie_secure': bool,
+        'session_type': str,
+        'sqlalchemy_track_modifications': bool,
+        'sqlalchemy_database_uri': str,
+        'sqlalchemy_engine_options': dict,
+
+        # General Settings
+        'captcha_enable': bool,
+        'captcha_height': int,
+        'captcha_length': int,
+        'captcha_session_key': str,
+        'captcha_width': int,
+        'mail_server': str,
+        'mail_port': int,
+        'mail_debug': bool,
+        'mail_use_ssl': bool,
+        'mail_use_tls': bool,
+        'mail_username': str,
+        'mail_password': str,
+        'mail_default_sender': str,
+        'remote_user_enabled': bool,
+        'remote_user_cookies': list,
+        'remote_user_logout_url': str,
+        'maintenance': bool,
+        'fullscreen_layout': bool,
+        'record_helper': bool,
+        'login_ldap_first': bool,
+        'default_record_table_size': int,
+        'default_domain_table_size': int,
+        'auto_ptr': bool,
+        'record_quick_edit': bool,
+        'pretty_ipv6_ptr': bool,
+        'dnssec_admins_only': bool,
+        'allow_user_create_domain': bool,
+        'allow_user_remove_domain': bool,
+        'allow_user_view_history': bool,
+        'custom_history_header': str,
+        'delete_sso_accounts': bool,
+        'bg_domain_updates': bool,
+        'enable_api_rr_history': bool,
+        'preserve_history': bool,
+        'site_name': str,
+        'site_url': str,
+        'session_timeout': int,
+        'warn_session_timeout': bool,
+        'pdns_api_url': str,
+        'pdns_api_key': str,
+        'pdns_api_timeout': int,
+        'pdns_version': str,
+        'verify_ssl_connections': bool,
+        'verify_user_email': bool,
+        'enforce_api_ttl': bool,
+        'ttl_options': str,
+        'otp_field_enabled': bool,
+        'custom_css': str,
+        'otp_force': bool,
+        'max_history_records': int,
+        'deny_domain_override': bool,
+        'account_name_extra_chars': bool,
+        'gravatar_enabled': bool,
+        'forward_records_allow_edit': dict,
+        'reverse_records_allow_edit': dict,
+
+        # Local Authentication Settings
+        'local_db_enabled': bool,
+        'signup_enabled': bool,
+        'pwd_enforce_characters': bool,
+        'pwd_min_len': int,
+        'pwd_min_lowercase': int,
+        'pwd_min_uppercase': int,
+        'pwd_min_digits': int,
+        'pwd_min_special': int,
+        'pwd_enforce_complexity': bool,
+        'pwd_min_complexity': int,
+
+        # LDAP Authentication Settings
+        'ldap_enabled': bool,
+        'ldap_type': str,
+        'ldap_uri': str,
+        'ldap_base_dn': str,
+        'ldap_admin_username': str,
+        'ldap_admin_password': str,
+        'ldap_domain': str,
+        'ldap_filter_basic': str,
+        'ldap_filter_username': str,
+        'ldap_filter_group': str,
+        'ldap_filter_groupname': str,
+        'ldap_sg_enabled': bool,
+        'ldap_admin_group': str,
+        'ldap_operator_group': str,
+        'ldap_user_group': str,
+        'autoprovisioning': bool,
+        'autoprovisioning_attribute': str,
+        'urn_value': str,
+        'purge': bool,
+
+        # Google OAuth Settings
+        'google_oauth_enabled': bool,
+        'google_oauth_client_id': str,
+        'google_oauth_client_secret': str,
+        'google_oauth_scope': str,
+        'google_base_url': str,
+        'google_oauth_auto_configure': bool,
+        'google_oauth_metadata_url': str,
+        'google_token_url': str,
+        'google_authorize_url': str,
+
+        # GitHub OAuth Settings
+        'github_oauth_enabled': bool,
+        'github_oauth_key': str,
+        'github_oauth_secret': str,
+        'github_oauth_scope': str,
+        'github_oauth_api_url': str,
+        'github_oauth_auto_configure': bool,
+        'github_oauth_metadata_url': str,
+        'github_oauth_token_url': str,
+        'github_oauth_authorize_url': str,
+
+        # Azure OAuth Settings
+        'azure_oauth_enabled': bool,
+        'azure_oauth_key': str,
+        'azure_oauth_secret': str,
+        'azure_oauth_scope': str,
+        'azure_oauth_api_url': str,
+        'azure_oauth_auto_configure': bool,
+        'azure_oauth_metadata_url': str,
+        'azure_oauth_token_url': str,
+        'azure_oauth_authorize_url': str,
+        'azure_sg_enabled': bool,
+        'azure_admin_group': str,
+        'azure_operator_group': str,
+        'azure_user_group': str,
+        'azure_group_accounts_enabled': bool,
+        'azure_group_accounts_name': str,
+        'azure_group_accounts_name_re': str,
+        'azure_group_accounts_description': str,
+        'azure_group_accounts_description_re': str,
+
+        # OIDC OAuth Settings
+        'oidc_oauth_enabled': bool,
+        'oidc_oauth_key': str,
+        'oidc_oauth_secret': str,
+        'oidc_oauth_scope': str,
+        'oidc_oauth_api_url': str,
+        'oidc_oauth_auto_configure': bool,
+        'oidc_oauth_metadata_url': str,
+        'oidc_oauth_token_url': str,
+        'oidc_oauth_authorize_url': str,
+        'oidc_oauth_logout_url': str,
+        'oidc_oauth_username': str,
+        'oidc_oauth_email': str,
+        'oidc_oauth_firstname': str,
+        'oidc_oauth_last_name': str,
+        'oidc_oauth_account_name_property': str,
+        'oidc_oauth_account_description_property': str,
+
+        # SAML Authentication Settings
+        'saml_enabled': bool,
+        'saml_debug': bool,
+        'saml_path': str,
+        'saml_metadata_url': str,
+        'saml_metadata_cache_lifetime': int,
+        'saml_idp_sso_binding': str,
+        'saml_idp_entity_id': str,
+        'saml_nameid_format': str,
+        'saml_attribute_account': str,
+        'saml_attribute_email': str,
+        'saml_attribute_givenname': str,
+        'saml_attribute_surname': str,
+        'saml_attribute_name': str,
+        'saml_attribute_username': str,
+        'saml_attribute_admin': str,
+        'saml_attribute_group': str,
+        'saml_group_admin_name': str,
+        'saml_group_operator_name': str,
+        'saml_group_to_account_mapping': str,
+        'saml_sp_entity_id': str,
+        'saml_sp_contact_name': str,
+        'saml_sp_contact_mail': str,
+        'saml_sign_request': bool,
+        'saml_want_message_signed': bool,
+        'saml_logout': bool,
+        'saml_logout_url': str,
+        'saml_assertion_encrypted': bool,
+        'saml_cert': str,
+        'saml_key': str,
+    }
+
+    groups = {
+        'authentication': [
+            # Local Authentication Settings
+            'local_db_enabled',
+            'signup_enabled',
+            'pwd_enforce_characters',
+            'pwd_min_len',
+            'pwd_min_lowercase',
+            'pwd_min_uppercase',
+            'pwd_min_digits',
+            'pwd_min_special',
+            'pwd_enforce_complexity',
+            'pwd_min_complexity',
+
+            # LDAP Authentication Settings
+            'ldap_enabled',
+            'ldap_type',
+            'ldap_uri',
+            'ldap_base_dn',
+            'ldap_admin_username',
+            'ldap_admin_password',
+            'ldap_domain',
+            'ldap_filter_basic',
+            'ldap_filter_username',
+            'ldap_filter_group',
+            'ldap_filter_groupname',
+            'ldap_sg_enabled',
+            'ldap_admin_group',
+            'ldap_operator_group',
+            'ldap_user_group',
+            'autoprovisioning',
+            'autoprovisioning_attribute',
+            'urn_value',
+            'purge',
+
+            # Google OAuth Settings
+            'google_oauth_enabled',
+            'google_oauth_client_id',
+            'google_oauth_client_secret',
+            'google_oauth_scope',
+            'google_base_url',
+            'google_oauth_auto_configure',
+            'google_oauth_metadata_url',
+            'google_token_url',
+            'google_authorize_url',
+
+            # GitHub OAuth Settings
+            'github_oauth_enabled',
+            'github_oauth_key',
+            'github_oauth_secret',
+            'github_oauth_scope',
+            'github_oauth_api_url',
+            'github_oauth_auto_configure',
+            'github_oauth_metadata_url',
+            'github_oauth_token_url',
+            'github_oauth_authorize_url',
+
+            # Azure OAuth Settings
+            'azure_oauth_enabled',
+            'azure_oauth_key',
+            'azure_oauth_secret',
+            'azure_oauth_scope',
+            'azure_oauth_api_url',
+            'azure_oauth_auto_configure',
+            'azure_oauth_metadata_url',
+            'azure_oauth_token_url',
+            'azure_oauth_authorize_url',
+            'azure_sg_enabled',
+            'azure_admin_group',
+            'azure_operator_group',
+            'azure_user_group',
+            'azure_group_accounts_enabled',
+            'azure_group_accounts_name',
+            'azure_group_accounts_name_re',
+            'azure_group_accounts_description',
+            'azure_group_accounts_description_re',
+
+            # OIDC OAuth Settings
+            'oidc_oauth_enabled',
+            'oidc_oauth_key',
+            'oidc_oauth_secret',
+            'oidc_oauth_scope',
+            'oidc_oauth_api_url',
+            'oidc_oauth_auto_configure',
+            'oidc_oauth_metadata_url',
+            'oidc_oauth_token_url',
+            'oidc_oauth_authorize_url',
+            'oidc_oauth_logout_url',
+            'oidc_oauth_username',
+            'oidc_oauth_email',
+            'oidc_oauth_firstname',
+            'oidc_oauth_last_name',
+            'oidc_oauth_account_name_property',
+            'oidc_oauth_account_description_property',
+        ]
+    }
+
+    @staticmethod
+    def convert_type(name, value):
+        import json
+        from json import JSONDecodeError
+        if name in AppSettings.types:
+            var_type = AppSettings.types[name]
+
+            # Handle boolean values
+            if var_type == bool and isinstance(value, str):
+                if value.lower() in ['True', 'true', '1'] or value is True:
+                    return True
+                else:
+                    return False
+
+            # Handle float values
+            if var_type == float:
+                return float(value)
+
+            # Handle integer values
+            if var_type == int:
+                return int(value)
+
+            if (var_type == dict or var_type == list) and isinstance(value, str) and len(value) > 0:
+                try:
+                    return json.loads(value)
+                except JSONDecodeError as e:
+                    raise ValueError('Cannot parse json {} for variable {}'.format(value, name))
+
+            if var_type == str:
+                return str(value)
+
+        return value
+
+    @staticmethod
+    def load_environment(app):
+        """ Load app settings from environment variables when defined. """
+        import os
+
+        for var_name, default_value in AppSettings.defaults.items():
+            env_name = var_name.upper()
+            current_value = None
+
+            if env_name + '_FILE' in os.environ:
+                if env_name in os.environ:
+                    raise AttributeError(
+                        "Both {} and {} are set but are exclusive.".format(
+                            env_name, env_name + '_FILE'))
+                with open(os.environ[env_name + '_FILE']) as f:
+                    current_value = f.read()
+                f.close()
+
+            elif env_name in os.environ:
+                current_value = os.environ[env_name]
+
+            if current_value is not None:
+                app.config[env_name] = AppSettings.convert_type(var_name, current_value)
--- a/powerdnsadmin/models/setting.py
+++ b/powerdnsadmin/models/setting.py
@ -1,12 +1,10 @@
 import sys
 import traceback
-
 import pytimeparse
 from ast import literal_eval
-from distutils.util import strtobool
 from flask import current_app
-
 from .base import db
+from powerdnsadmin.lib.settings import AppSettings


 class Setting(db.Model):
@ -14,437 +12,8 @@ class Setting(db.Model):
    name = db.Column(db.String(64), unique=True, index=True)
    value = db.Column(db.Text())

-    types = {
-        'maintenance': bool,
-        'fullscreen_layout': bool,
-        'record_helper': bool,
-        'login_ldap_first': bool,
-        'default_record_table_size': int,
-        'default_domain_table_size': int,
-        'auto_ptr': bool,
-        'record_quick_edit': bool,
-        'pretty_ipv6_ptr': bool,
-        'dnssec_admins_only': bool,
-        'allow_user_create_domain': bool,
-        'allow_user_remove_domain': bool,
-        'allow_user_view_history': bool,
-        'custom_history_header': str,
-        'delete_sso_accounts': bool,
-        'bg_domain_updates': bool,
-        'enable_api_rr_history': bool,
-        'preserve_history': bool,
-        'site_name': str,
-        'site_url': str,
-        'session_timeout': int,
-        'warn_session_timeout': bool,
-        'pdns_api_url': str,
-        'pdns_api_key': str,
-        'pdns_api_timeout': int,
-        'pdns_version': str,
-        'verify_ssl_connections': bool,
-        'verify_user_email': bool,
-        'enforce_api_ttl': bool,
-        'ttl_options': str,
-        'otp_field_enabled': bool,
-        'custom_css': str,
-        'otp_force': bool,
-        'max_history_records': int,
-        'deny_domain_override': bool,
-        'account_name_extra_chars': bool,
-        'gravatar_enabled': bool,
-        'forward_records_allow_edit': dict,
-        'reverse_records_allow_edit': dict,
-        'local_db_enabled': bool,
-        'signup_enabled': bool,
-        'pwd_enforce_characters': bool,
-        'pwd_min_len': int,
-        'pwd_min_lowercase': int,
-        'pwd_min_uppercase': int,
-        'pwd_min_digits': int,
-        'pwd_min_special': int,
-        'pwd_enforce_complexity': bool,
-        'pwd_min_complexity': int,
-        'ldap_enabled': bool,
-        'ldap_type': str,
-        'ldap_uri': str,
-        'ldap_base_dn': str,
-        'ldap_admin_username': str,
-        'ldap_admin_password': str,
-        'ldap_domain': str,
-        'ldap_filter_basic': str,
-        'ldap_filter_username': str,
-        'ldap_filter_group': str,
-        'ldap_filter_groupname': str,
-        'ldap_sg_enabled': bool,
-        'ldap_admin_group': str,
-        'ldap_operator_group': str,
-        'ldap_user_group': str,
-        'autoprovisioning': bool,
-        'autoprovisioning_attribute': str,
-        'urn_value': str,
-        'purge': bool,
-        'google_oauth_enabled': bool,
-        'google_oauth_client_id': str,
-        'google_oauth_client_secret': str,
-        'google_oauth_scope': str,
-        'google_base_url': str,
-        'google_oauth_auto_configure': bool,
-        'google_oauth_metadata_url': str,
-        'google_token_url': str,
-        'google_authorize_url': str,
-        'github_oauth_enabled': bool,
-        'github_oauth_key': str,
-        'github_oauth_secret': str,
-        'github_oauth_scope': str,
-        'github_oauth_api_url': str,
-        'github_oauth_auto_configure': bool,
-        'github_oauth_metadata_url': str,
-        'github_oauth_token_url': str,
-        'github_oauth_authorize_url': str,
-        'azure_oauth_enabled': bool,
-        'azure_oauth_key': str,
-        'azure_oauth_secret': str,
-        'azure_oauth_scope': str,
-        'azure_oauth_api_url': str,
-        'azure_oauth_auto_configure': bool,
-        'azure_oauth_metadata_url': str,
-        'azure_oauth_token_url': str,
-        'azure_oauth_authorize_url': str,
-        'azure_sg_enabled': bool,
-        'azure_admin_group': str,
-        'azure_operator_group': str,
-        'azure_user_group': str,
-        'azure_group_accounts_enabled': bool,
-        'azure_group_accounts_name': str,
-        'azure_group_accounts_name_re': str,
-        'azure_group_accounts_description': str,
-        'azure_group_accounts_description_re': str,
-        'oidc_oauth_enabled': bool,
-        'oidc_oauth_key': str,
-        'oidc_oauth_secret': str,
-        'oidc_oauth_scope': str,
-        'oidc_oauth_api_url': str,
-        'oidc_oauth_auto_configure': bool,
-        'oidc_oauth_metadata_url': str,
-        'oidc_oauth_token_url': str,
-        'oidc_oauth_authorize_url': str,
-        'oidc_oauth_logout_url': str,
-        'oidc_oauth_username': str,
-        'oidc_oauth_email': str,
-        'oidc_oauth_firstname': str,
-        'oidc_oauth_last_name': str,
-        'oidc_oauth_account_name_property': str,
-        'oidc_oauth_account_description_property': str,
-    }
-    
-    defaults = {
-        # General Settings
-        'maintenance': False,
-        'fullscreen_layout': True,
-        'record_helper': True,
-        'login_ldap_first': True,
-        'default_record_table_size': 15,
-        'default_domain_table_size': 10,
-        'auto_ptr': False,
-        'record_quick_edit': True,
-        'pretty_ipv6_ptr': False,
-        'dnssec_admins_only': False,
-        'allow_user_create_domain': False,
-        'allow_user_remove_domain': False,
-        'allow_user_view_history': False,
-        'custom_history_header': '',
-        'delete_sso_accounts': False,
-        'bg_domain_updates': False,
-        'enable_api_rr_history': True,
-        'preserve_history': False,
-        'site_name': 'PowerDNS-Admin',
-        'site_url': 'http://localhost:9191',
-        'session_timeout': 10,
-        'warn_session_timeout': True,
-        'pdns_api_url': '',
-        'pdns_api_key': '',
-        'pdns_api_timeout': 30,
-        'pdns_version': '4.1.1',
-        'verify_ssl_connections': True,
-        'verify_user_email': False,
-        'enforce_api_ttl': False,
-        'ttl_options': '1 minute,5 minutes,30 minutes,60 minutes,24 hours',
-        'otp_field_enabled': True,
-        'custom_css': '',
-        'otp_force': False,
-        'max_history_records': 1000,
-        'deny_domain_override': False,
-        'account_name_extra_chars': False,
-        'gravatar_enabled': False,
-
-        # Local Authentication Settings
-        'local_db_enabled': True,
-        'signup_enabled': True,
-        'pwd_enforce_characters': False,
-        'pwd_min_len': 10,
-        'pwd_min_lowercase': 3,
-        'pwd_min_uppercase': 2,
-        'pwd_min_digits': 2,
-        'pwd_min_special': 1,
-        'pwd_enforce_complexity': False,
-        'pwd_min_complexity': 11,
-
-        # LDAP Authentication Settings
-        'ldap_enabled': False,
-        'ldap_type': 'ldap',
-        'ldap_uri': '',
-        'ldap_base_dn': '',
-        'ldap_admin_username': '',
-        'ldap_admin_password': '',
-        'ldap_domain': '',
-        'ldap_filter_basic': '',
-        'ldap_filter_username': '',
-        'ldap_filter_group': '',
-        'ldap_filter_groupname': '',
-        'ldap_sg_enabled': False,
-        'ldap_admin_group': '',
-        'ldap_operator_group': '',
-        'ldap_user_group': '',
-        'autoprovisioning': False,
-        'autoprovisioning_attribute': '',
-        'urn_value': '',
-        'purge': False,
-
-        # Google OAuth2 Settings
-        'google_oauth_enabled': False,
-        'google_oauth_client_id': '',
-        'google_oauth_client_secret': '',
-        'google_oauth_scope': 'openid email profile',
-        'google_base_url': 'https://www.googleapis.com/oauth2/v3/',
-        'google_oauth_auto_configure': True,
-        'google_oauth_metadata_url': 'https://accounts.google.com/.well-known/openid-configuration',
-        'google_token_url': 'https://oauth2.googleapis.com/token',
-        'google_authorize_url': 'https://accounts.google.com/o/oauth2/v2/auth',
-
-        # GitHub OAuth2 Settings
-        'github_oauth_enabled': False,
-        'github_oauth_key': '',
-        'github_oauth_secret': '',
-        'github_oauth_scope': 'email',
-        'github_oauth_api_url': 'https://api.github.com/user',
-        'github_oauth_auto_configure': False,
-        'github_oauth_metadata_url': '',
-        'github_oauth_token_url': 'https://github.com/login/oauth/access_token',
-        'github_oauth_authorize_url': 'https://github.com/login/oauth/authorize',
-
-        # Azure OAuth2 Settings
-        'azure_oauth_enabled': False,
-        'azure_oauth_key': '',
-        'azure_oauth_secret': '',
-        'azure_oauth_scope': 'User.Read openid email profile',
-        'azure_oauth_api_url': 'https://graph.microsoft.com/v1.0/',
-        'azure_oauth_auto_configure': True,
-        'azure_oauth_metadata_url': '',
-        'azure_oauth_token_url': '',
-        'azure_oauth_authorize_url': '',
-        'azure_sg_enabled': False,
-        'azure_admin_group': '',
-        'azure_operator_group': '',
-        'azure_user_group': '',
-        'azure_group_accounts_enabled': False,
-        'azure_group_accounts_name': 'displayName',
-        'azure_group_accounts_name_re': '',
-        'azure_group_accounts_description': 'description',
-        'azure_group_accounts_description_re': '',
-
-        # OIDC OAuth2 Settings
-        'oidc_oauth_enabled': False,
-        'oidc_oauth_key': '',
-        'oidc_oauth_secret': '',
-        'oidc_oauth_scope': 'email',
-        'oidc_oauth_api_url': '',
-        'oidc_oauth_auto_configure': True,
-        'oidc_oauth_metadata_url': '',
-        'oidc_oauth_token_url': '',
-        'oidc_oauth_authorize_url': '',
-        'oidc_oauth_logout_url': '',
-        'oidc_oauth_username': 'preferred_username',
-        'oidc_oauth_email': 'email',
-        'oidc_oauth_firstname': 'given_name',
-        'oidc_oauth_last_name': 'family_name',
-        'oidc_oauth_account_name_property': '',
-        'oidc_oauth_account_description_property': '',
-
-        # Zone Record Settings
-        'forward_records_allow_edit': {
-            'A': True,
-            'AAAA': True,
-            'AFSDB': False,
-            'ALIAS': False,
-            'CAA': True,
-            'CERT': False,
-            'CDNSKEY': False,
-            'CDS': False,
-            'CNAME': True,
-            'DNSKEY': False,
-            'DNAME': False,
-            'DS': False,
-            'HINFO': False,
-            'KEY': False,
-            'LOC': True,
-            'LUA': False,
-            'MX': True,
-            'NAPTR': False,
-            'NS': True,
-            'NSEC': False,
-            'NSEC3': False,
-            'NSEC3PARAM': False,
-            'OPENPGPKEY': False,
-            'PTR': True,
-            'RP': False,
-            'RRSIG': False,
-            'SOA': False,
-            'SPF': True,
-            'SSHFP': False,
-            'SRV': True,
-            'TKEY': False,
-            'TSIG': False,
-            'TLSA': False,
-            'SMIMEA': False,
-            'TXT': True,
-            'URI': False
-        },
-        'reverse_records_allow_edit': {
-            'A': False,
-            'AAAA': False,
-            'AFSDB': False,
-            'ALIAS': False,
-            'CAA': False,
-            'CERT': False,
-            'CDNSKEY': False,
-            'CDS': False,
-            'CNAME': False,
-            'DNSKEY': False,
-            'DNAME': False,
-            'DS': False,
-            'HINFO': False,
-            'KEY': False,
-            'LOC': True,
-            'LUA': False,
-            'MX': False,
-            'NAPTR': False,
-            'NS': True,
-            'NSEC': False,
-            'NSEC3': False,
-            'NSEC3PARAM': False,
-            'OPENPGPKEY': False,
-            'PTR': True,
-            'RP': False,
-            'RRSIG': False,
-            'SOA': False,
-            'SPF': False,
-            'SSHFP': False,
-            'SRV': False,
-            'TKEY': False,
-            'TSIG': False,
-            'TLSA': False,
-            'SMIMEA': False,
-            'TXT': True,
-            'URI': False
-        },
-    }
-
-    groups = {
-        'authentication': [
-            # Local Authentication Settings
-            'local_db_enabled',
-            'signup_enabled',
-            'pwd_enforce_characters',
-            'pwd_min_len',
-            'pwd_min_lowercase',
-            'pwd_min_uppercase',
-            'pwd_min_digits',
-            'pwd_min_special',
-            'pwd_enforce_complexity',
-            'pwd_min_complexity',
-
-            # LDAP Authentication Settings
-            'ldap_enabled',
-            'ldap_type',
-            'ldap_uri',
-            'ldap_base_dn',
-            'ldap_admin_username',
-            'ldap_admin_password',
-            'ldap_domain',
-            'ldap_filter_basic',
-            'ldap_filter_username',
-            'ldap_filter_group',
-            'ldap_filter_groupname',
-            'ldap_sg_enabled',
-            'ldap_admin_group',
-            'ldap_operator_group',
-            'ldap_user_group',
-            'autoprovisioning',
-            'autoprovisioning_attribute',
-            'urn_value',
-            'purge',
-
-            # Google OAuth2 Settings
-            'google_oauth_enabled',
-            'google_oauth_client_id',
-            'google_oauth_client_secret',
-            'google_oauth_scope',
-            'google_base_url',
-            'google_oauth_auto_configure',
-            'google_oauth_metadata_url',
-            'google_token_url',
-            'google_authorize_url',
-
-            # GitHub OAuth2 Settings
-            'github_oauth_enabled',
-            'github_oauth_key',
-            'github_oauth_secret',
-            'github_oauth_scope',
-            'github_oauth_api_url',
-            'github_oauth_auto_configure',
-            'github_oauth_metadata_url',
-            'github_oauth_token_url',
-            'github_oauth_authorize_url',
-
-            # Azure OAuth2 Settings
-            'azure_oauth_enabled',
-            'azure_oauth_key',
-            'azure_oauth_secret',
-            'azure_oauth_scope',
-            'azure_oauth_api_url',
-            'azure_oauth_auto_configure',
-            'azure_oauth_metadata_url',
-            'azure_oauth_token_url',
-            'azure_oauth_authorize_url',
-            'azure_sg_enabled',
-            'azure_admin_group',
-            'azure_operator_group',
-            'azure_user_group',
-            'azure_group_accounts_enabled',
-            'azure_group_accounts_name',
-            'azure_group_accounts_name_re',
-            'azure_group_accounts_description',
-            'azure_group_accounts_description_re',
-
-            # OIDC OAuth2 Settings
-            'oidc_oauth_enabled',
-            'oidc_oauth_key',
-            'oidc_oauth_secret',
-            'oidc_oauth_scope',
-            'oidc_oauth_api_url',
-            'oidc_oauth_auto_configure',
-            'oidc_oauth_metadata_url',
-            'oidc_oauth_token_url',
-            'oidc_oauth_authorize_url',
-            'oidc_oauth_logout_url',
-            'oidc_oauth_username',
-            'oidc_oauth_email',
-            'oidc_oauth_firstname',
-            'oidc_oauth_last_name',
-            'oidc_oauth_account_name_property',
-            'oidc_oauth_account_description_property',
-        ]
-    }
+    ZONE_TYPE_FORWARD = 'forward'
+    ZONE_TYPE_REVERSE = 'reverse'

    def __init__(self, id=None, name=None, value=None):
        self.id = id
@ -457,44 +26,12 @@ class Setting(db.Model):
        self.name = name
        self.value = value

-    def convert_type(self, name, value):
-        import json
-        from json import JSONDecodeError
-        if name in self.types:
-            var_type = self.types[name]
-
-            # Handle boolean values
-            if var_type == bool:
-                if value == 'True' or value == 'true' or value == '1' or value is True:
-                    return True
-                else:
-                    return False
-
-            # Handle float values
-            if var_type == float:
-                return float(value)
-
-            # Handle integer values
-            if var_type == int:
-                return int(value)
-
-            if (var_type == dict or var_type == list) and isinstance(value, str) and len(value) > 0:
-                try:
-                    return json.loads(value)
-                except JSONDecodeError as e:
-                    pass
-
-            if var_type == str:
-                return str(value)
-
-        return value
-
    def set_maintenance(self, mode):
        maintenance = Setting.query.filter(
            Setting.name == 'maintenance').first()

        if maintenance is None:
-            value = self.defaults['maintenance']
+            value = AppSettings.defaults['maintenance']
            maintenance = Setting(name='maintenance', value=str(value))
            db.session.add(maintenance)

@ -516,7 +53,7 @@ class Setting(db.Model):
        current_setting = Setting.query.filter(Setting.name == setting).first()

        if current_setting is None:
-            value = self.defaults[setting]
+            value = AppSettings.defaults[setting]
            current_setting = Setting(name=setting, value=str(value))
            db.session.add(current_setting)

@ -541,21 +78,20 @@ class Setting(db.Model):
            current_setting = Setting(name=setting, value=None)
            db.session.add(current_setting)

-        value = str(self.convert_type(setting, value))
+        value = str(AppSettings.convert_type(setting, value))

        try:
            current_setting.value = value
            db.session.commit()
            return True
        except Exception as e:
-            current_app.logger.error('Cannot edit setting {0}. DETAIL: {1}'.format(
-                setting, e))
+            current_app.logger.error('Cannot edit setting {0}. DETAIL: {1}'.format(setting, e))
            current_app.logger.debug(traceback.format_exec())
            db.session.rollback()
            return False

    def get(self, setting):
-        if setting in self.defaults:
+        if setting in AppSettings.defaults:

            if setting.upper() in current_app.config:
                result = current_app.config[setting.upper()]
@ -566,51 +102,45 @@ class Setting(db.Model):
                if hasattr(result, 'value'):
                    result = result.value

-                return self.convert_type(setting, result)
+                return AppSettings.convert_type(setting, result)
            else:
-                return self.defaults[setting]
+                return AppSettings.defaults[setting]
        else:
            current_app.logger.error('Unknown setting queried: {0}'.format(setting))

    def get_group(self, group):
        if not isinstance(group, list):
-            group = self.groups[group]
+            group = AppSettings.groups[group]

        result = {}
-        records = self.query.all()

-        for record in records:
-            if record.name in group:
-                result[record.name] = self.convert_type(record.name, record.value)
+        for var_name, default_value in AppSettings.defaults.items():
+            if var_name in group:
+                result[var_name] = self.get(var_name)

        return result

    def get_records_allow_to_edit(self):
        return list(
-            set(self.get_forward_records_allow_to_edit() +
-                self.get_reverse_records_allow_to_edit()))
+            set(self.get_supported_record_types(self.ZONE_TYPE_FORWARD) +
+                self.get_supported_record_types(self.ZONE_TYPE_REVERSE)))

-    def get_forward_records_allow_to_edit(self):
-        records = self.get('forward_records_allow_edit')
-        f_records = literal_eval(records) if isinstance(records,
-                                                        str) else records
-        r_name = [r for r in f_records if f_records[r]]
-        # Sort alphabetically if python version is smaller than 3.6
-        if sys.version_info[0] < 3 or (sys.version_info[0] == 3
-                                       and sys.version_info[1] < 6):
-            r_name.sort()
-        return r_name
+    def get_supported_record_types(self, zone_type):
+        setting_value = []
+
+        if zone_type == self.ZONE_TYPE_FORWARD:
+            setting_value = self.get('forward_records_allow_edit')
+        elif zone_type == self.ZONE_TYPE_REVERSE:
+            setting_value = self.get('reverse_records_allow_edit')
+
+        records = literal_eval(setting_value) if isinstance(setting_value, str) else setting_value
+        types = [r for r in records if records[r]]

-    def get_reverse_records_allow_to_edit(self):
-        records = self.get('reverse_records_allow_edit')
-        r_records = literal_eval(records) if isinstance(records,
-                                                        str) else records
-        r_name = [r for r in r_records if r_records[r]]
        # Sort alphabetically if python version is smaller than 3.6
-        if sys.version_info[0] < 3 or (sys.version_info[0] == 3
-                                       and sys.version_info[1] < 6):
-            r_name.sort()
-        return r_name
+        if sys.version_info[0] < 3 or (sys.version_info[0] == 3 and sys.version_info[1] < 6):
+            types.sort()
+
+        return types

    def get_ttl_options(self):
        return [(pytimeparse.parse(ttl), ttl)
--- a/powerdnsadmin/routes/admin.py
+++ b/powerdnsadmin/routes/admin.py
@ -1460,6 +1460,7 @@ def setting_pdns():
@login_required
@operator_role_required
 def setting_records():
+    from powerdnsadmin.lib.settings import AppSettings
    if request.method == 'GET':
        _fr = Setting().get('forward_records_allow_edit')
        _rr = Setting().get('reverse_records_allow_edit')
@ -1472,7 +1473,7 @@ def setting_records():
    elif request.method == 'POST':
        fr = {}
        rr = {}
-        records = Setting().defaults['forward_records_allow_edit']
+        records = AppSettings.defaults['forward_records_allow_edit']
        for r in records:
            fr[r] = True if request.form.get('fr_{0}'.format(
                r.lower())) else False
@ -1517,6 +1518,7 @@ def setting_authentication():
@login_required
@admin_role_required
 def setting_authentication_api():
+    from powerdnsadmin.lib.settings import AppSettings
    result = {'status': 1, 'messages': [], 'data': {}}

    if request.form.get('commit') == '1':
@ -1524,7 +1526,7 @@ def setting_authentication_api():
        data = json.loads(request.form.get('data'))

        for key, value in data.items():
-            if key in model.groups['authentication']:
+            if key in AppSettings.groups['authentication']:
                model.set(key, value)

    result['data'] = Setting().get_group('authentication')
--- a/powerdnsadmin/routes/domain.py
+++ b/powerdnsadmin/routes/domain.py
@ -72,9 +72,9 @@ def domain(domain_name):
    quick_edit = Setting().get('record_quick_edit')
    records_allow_to_edit = Setting().get_records_allow_to_edit()
    forward_records_allow_to_edit = Setting(
-    ).get_forward_records_allow_to_edit()
+    ).get_supported_record_types(Setting().ZONE_TYPE_FORWARD)
    reverse_records_allow_to_edit = Setting(
-    ).get_reverse_records_allow_to_edit()
+    ).get_supported_record_types(Setting().ZONE_TYPE_REVERSE)
    ttl_options = Setting().get_ttl_options()
    records = []