一个装饰器示例代码

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  • 10 Jul

def user_passes_test(test_func, login_url=None, redirect_field_name=REDIRECT_FIELD_NAME):

def decorator(view_func):
    @wraps(view_func)
    def _wrapped_view(request, *args, **kwargs):
        #测试函数，通过后执行对应的视图函数
        if test_func(request.user):
            return view_func(request, *args, **kwargs)
        path = request.build_absolute_uri()  #返回请求完成的URL
         #获取登录页指定的URL
        resolved_login_url = resolve_url(login_url or settings.LOGIN_URL)
        # If the login url is the same scheme and net location then just
        # use the path as the "next" url.
        login_scheme, login_netloc = urlparse(resolved_login_url)[:2]
        current_scheme, current_netloc = urlparse(path)[:2]
        #如果登录页的 URL与path的协议，域都相同则执行下面代码
        if ((not login_scheme or login_scheme == current_scheme) and
                (not login_netloc or login_netloc == current_netloc)):
            #获取视图的全路径，返回 HttpResponseRedirect
            path = request.get_full_path()
        from django.contrib.auth.views import redirect_to_login
        return redirect_to_login(
            path, resolved_login_url, redirect_field_name)
    return _wrapped_view
return decorator
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