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.

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