必須のアクセス制御を設定してファイルとディレクトリに対するユーザーのアクセス許可を制限する方法

class LabelSystem:
    def __init__(self):
        self.labels = {}
        
    def assign_label(self, obj, label):
        self.labels[obj] = label
    
    def get_label(self, obj):
        return self.labels.get(obj)
    
    def check_permission(self, user_label, obj_label):
        if user_label <= obj_label:
            return True
        else:
            return False

class FileSystem:
    def __init__(self):
        self.files = {}
        
    def create_file(self, name):
        file = File(name)
        self.files[file] = Label("LOW")
        
    def create_directory(self, name):
        directory = Directory(name)
        self.files[directory] = Label("LOW")
        
    def get_file(self, name):
        for file in self.files:
            if file.name == name:
                return file
        return None
    
    def set_label(self, obj, label):
        if obj in self.files:
            self.files[obj] = Label(label)
        
    def get_label(self, obj):
        return self.files.get(obj)
    
    def check_permission(self, user, obj):
        user_label = self.get_label(user)
        obj_label = self.get_label(obj)
        
        if user_label and obj_label:
            return LabelSystem().check_permission(user_label, obj_label)
        else:
            return False
    
class File:
    def __init__(self, name):
        self.name = name
        
class Directory:
    def __init__(self, name):
        self.name = name
        
class Label:
    def __init__(self, level):
        self.level = level

if __name__ == "__main__":
    file_system = FileSystem()
    
    # 创建文件和目录
    file_system.create_file("file1.txt")
    file_system.create_directory("dir1")
    
    # 设置文件和目录的标签
    file_system.set_label(file_system.get_file("file1.txt"), "MEDIUM")
    file_system.set_label(file_system.get_file("dir1"), "HIGH")
    
    # 判断用户权限
    user_label = Label("LOW")
    print(file_system.check_permission(user_label, file_system.get_file("file1.txt")))  # True
    print(file_system.check_permission(user_label, file_system.get_file("dir1")))  # False