import re
 
from django.contrib.auth.models import AnonymousUser
from rest_framework.permissions import BasePermission
 
 
class PermissionControl(BasePermission):
  """自定义权限控制类"""
 
  def has_permission(self, request, view):
    # 0.若用户未登陆直接访问,返回未授权
    if isinstance(request.user, AnonymousUser):
      return False
    permission_list = request.user.role.get_all_permissions()
    # 1.角色管理-角色
    if request.method == 'GET' and re.match(r'^/role_manage/roles/$', request.path):
      if 'view_role' in permission_list:
        return True
      else:
        return False
    elif request.method == 'POST' and re.match(r'^/role_manage/roles/$', request.path):
      if 'add_role' in permission_list:
        return True
      else:
        return False
    elif request.method == 'PUT' and re.match(r'^/role_manage/roles/\d+/$', request.path):
      if 'change_role' in permission_list:
        return True
      else:
        return False
    elif request.method == 'PATCH' and re.match(r'^/role_manage/roles/\d+/$', request.path):
      if 'change_role' in permission_list:
        return True
      else:
        return False
    elif request.method == 'DELETE' and re.match(r'^/role_manage/roles/\d+/$', request.path):
      if 'delete_role' in permission_list:
        return True
      else:
        return False
 
    # 同理，判断所有路由及权限
 
  def has_object_permission(self, request, view, obj):
    """GET请求单个对象时执行"""
    # 0.若用户未登陆直接访问,返回未授权
    if isinstance(request.user, AnonymousUser):
      return False
    permission_list = request.user.get_all_permissions()
    # 1.角色管理-角色
    if request.method == 'GET' and re.match(r'^/role_manage/roles/\d+/$', request.path):
      if 'view_role' in permission_list:
        return True
      else:
        return False
    # 同理，判断所有路由及权限

class RoleViewSet(ModelViewSet):
  """
  list:
  查询所有角色
  read:
  根据角色id,查询角色
  create:
  创建角色
  delete:
  根据角色id,删除角色
  update:
  根据角色id,更新角色信息
  partial_update:
  根据角色id,部分更新角色信息
  """
  queryset = Role.objects.filter(is_delete=0).all()
  serializer_class = RoleSerializer
  permission_classes = [PermissionControl]
  filterset_class = RoleFilter
  pagination_class = StandarPageNumberPagination