Django web自定义通用权限控制实现方法

email = models.EmailField(
  verbose_name='email address',
  max_length=255,
  unique=True,
)
 password = models.CharField(_('password'),max_length=128,\
               help_text=mark_safe('''<a href ="password/" >修改密码</a>'''))
name = models.CharField(max_length=32,help_text='用户登陆后请修改为真实名字')
is_active = models.BooleanField(default=True)
is_admin = models.BooleanField(default=False)
role = models.ManyToManyField("Role")

def __str__(self):
  return self.email

class Role(models.Model):
  """角色表"""
  name = models.CharField(unique=True,max_length=32)
  menus = models.ManyToManyField("Menu")
  def __str__(self):
    return self.name

class Menu(models.Model):
  """动态菜单"""
  name = models.CharField(unique=True,max_length=32)
  url_type = models.SmallIntegerField(choices=((0,'relative_name'),(1,'absolute_url')))
  url_name = models.CharField(unique=True,max_length=128)

  def __str__(self):
    return self.name

<div class="container-fluid">
 <div class="row">
   {% block side-bar %}
  <div class="col-sm-3 col-md-2 sidebar">
   <ul class="nav nav-sidebar">
    {% block side-bar-menus %}
       {% for role in request.user.userprofile.roles.all %}
        <hr>
        {% for menu in role.menus.all %}
         <li>
           <a href="{% if menu.url_type == 0 %}{% url menu.url_name %}{% else %} {{ menu.url_name }}{% endif %}" rel="external nofollow"  >
           {{ menu.name }}
           </a>
         </li>
        {% endfor %}
      {% endfor %}
    {% endblock %}
    </ul>
  </div>
   {% endblock %}

class Mddile1(MiddlewareMixin):
  def process_request(self,request):
    #如果用户访问的url是登录、注册页面，记录到白名单，放行
    for url in settings.PASS_URL_LIST:
      if re.match(url,request.path_info):
        return None
    Permission_url_list=request.session.get(settings.SESSION_PERMISSION_URL_KEY)
    #如果用户访问的url 不在当前用户权限之内 返回login页面
    if not Permission_url_list:
      return redirect(settings.LOGIN_URL)
    current_url=request.path_info
    #由于数据库的数据，可能是正则所有 一定要精确匹配
    flag=False
    for url in Permission_url_list:
      url='^%s$'%(url)
      if re.match(url,current_url):
        flag=True
        break
    if not flag:
      if settings.DEBUG: #如果是程序调试应该 显示用户可以访问的权限
        url_html='<br/>'.join(Permission_url_list)
        return HttpResponse('无权访问您可以访问%s'%url_html)
      else:
        return HttpResponse('没有权限')