from cryptography.fernet import Fernet


def make_fernet(key: str) -> Fernet:
    return Fernet(key.encode() if isinstance(key, str) else key)


def encrypt(value: str, key: str) -> str:
    return make_fernet(key).encrypt(value.encode()).decode()


def decrypt(encrypted: str, key: str) -> str:
    return make_fernet(key).decrypt(encrypted.encode()).decode()


def is_valid_fernet_key(key: str) -> bool:
    try:
        Fernet(key.encode() if isinstance(key, str) else key)
        return True
    except Exception:
        return False