Improved task data validation and error handling

api/app.py

@@ -1,22 +1,48 @@
 from dotenv import load_dotenv
-from flask import Flask
+from flask import Flask, jsonify
 from flask_jwt_extended import JWTManager
+from jwt import ExpiredSignatureError
 from models import db
 import os
 from task_views import task_bp
 from user_views import user_bp, init_db
+from werkzeug.exceptions import HTTPException
 
+# App initialization
+load_dotenv()
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = os.getenv('SQLALCHEMY_DATABASE_URI')
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
+app.config['JWT_SECRET_KEY'] = os.getenv('JWT_SECRET_KEY', 'changeme')
+
+# Blueprints registration
+app.register_blueprint(user_bp)
+app.register_blueprint(task_bp)
+
+# Database and JWT initialization
+db.init_app(app)
+jwt = JWTManager(app)
+
+# Global error handler
+@app.errorhandler(Exception)
+def global_error_handler(error):
+    if isinstance(error, HTTPException):
+        response = jsonify({"error": error.description})
+        response.status_code = error.code
+    elif isinstance(error, ExpiredSignatureError):
+        response = jsonify({"error": "Token has expired"})
+        response.status_code = 401
+    else:  # Wszystkie inne błędy
+        response = jsonify({"error": str(error)})
+        response.status_code = 500
+    return response
+
+
+# Fill database by initial values
+with app.app_context():
+    db.create_all()
+    init_db()
+
+# Server start
 if __name__ == "__main__":
-    load_dotenv()
-    app = Flask(__name__)
-    app.config['SQLALCHEMY_DATABASE_URI'] = os.getenv('SQLALCHEMY_DATABASE_URI')
-    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
-    app.config['JWT_SECRET_KEY'] = os.getenv('JWT_SECRET_KEY', 'changeme')
-    app.register_blueprint(user_bp)
-    app.register_blueprint(task_bp)
-    db.init_app(app)
-    jwt = JWTManager(app)
-    with app.app_context():
-        db.create_all()
-        init_db()
     app.run(host='0.0.0.0')