decorator_final.py

from functools import wraps

def validate_json(*expected_args):
    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            json_ob = request.get_json()
            for expected_arg in expected_args:
                if expected_arg not in json_ob or json_ob.get(expected_arg) is None:
                    abort(400)
            return func(*args, **kwargs)
        return wrapper
    return decorator



@app.route("/addscore", methods=["POST"])
@validate_json("exercise_id", "score")
def add_score():
    json_data = request.get_json()
    exercise_id = json_data.get("exercise_id")
    score = json_data.get("score")
    model.add_attempt(exercise_id, score)
    return jsonify(dict(result="success"))


@app.route("/addtopic", methods=["POST"])
@validate_json("topic", "tags")
def add_topic():
    json_data = request.get_json()
    topic = json_data.get("topic")
    tags = json_data.get("tags")
    email = session.get("email")
    topic = topic.strip()
    tags = [tag.strip() for tag in tags if re.search(r"\w+", tag)]
    model.add_topic(topic, email, tags)
    return jsonify({"result": "task completed"})