refactor: create flask app using function

Author: nhymxu

logics/webserver.py

@@ -0,0 +1,13 @@
+import os
+
+from flask import Flask
+
+from logics.error_handler import ErrorHandler
+
+
+def create_app():
+    app = Flask(__name__)
+    app.config['SERVER_AUTH_KEY'] = os.getenv('SERVER_AUTH_KEY')
+    ErrorHandler(app)
+
+    return app

web.py

@@ -1,19 +1,17 @@
 import base64
 import io
-import os
 
 from asgiref.wsgi import WsgiToAsgi
 from dotenv import load_dotenv
-from flask import Flask, send_file
+from flask import send_file
 
 from logics.auth_middleware import require_authentication
-from logics.error_handler import ErrorHandler
+
+from logics.webserver import create_app
 
 
 load_dotenv()
-app = Flask(__name__)
-app.config['SERVER_AUTH_KEY'] = os.getenv('SERVER_AUTH_KEY')
-ErrorHandler(app)
+app = create_app()
 
 asgi_app = WsgiToAsgi(app)