Introduce config file for application

app/__init__.py

@@ -1,12 +1,33 @@
+import os
 from flask import Flask
+from config import configs
+from flask._compat import string_types
 
 
-def create_app():
+def create_app(config_name):
     application = Flask(__name__)
 
-    # application.config['NOTIFY_API_ENVIRONMENT'] = config_name
-    # application.config.from_object(configs[config_name])
+    application.config['NOTIFY_API_ENVIRONMENT'] = config_name
+    application.config.from_object(configs[config_name])
+    init_app(application)
+
     from app.main import main as main_blueprint
     application.register_blueprint(main_blueprint)
 
     return application
+
+
+def init_app(app):
+    for key, value in app.config.items():
+        if key in os.environ:
+            app.config[key] = convert_to_boolean(os.environ[key])
+
+
+def convert_to_boolean(value):
+    if isinstance(value, string_types):
+        if value.lower() in ['t', 'true', 'on', 'yes', '1']:
+            return True
+        elif value.lower() in ['f', 'false', 'off', 'no', '0']:
+            return False
+
+    return value