| # |
| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, |
| # software distributed under the License is distributed on an |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| # KIND, either express or implied. See the License for the |
| # specific language governing permissions and limitations |
| # under the License. |
| |
| import jinja2.sandbox |
| |
| |
| class SandboxedEnvironment(jinja2.sandbox.SandboxedEnvironment): |
| """SandboxedEnvironment for Airflow task templates.""" |
| |
| def is_safe_attribute(self, obj, attr, value): |
| """ |
| Allow access to ``_`` prefix vars (but not ``__``). |
| |
| Unlike the stock SandboxedEnvironment, we allow access to "private" attributes (ones starting with |
| ``_``) whilst still blocking internal or truely private attributes (``__`` prefixed ones). |
| """ |
| return not jinja2.sandbox.is_internal_attribute(obj, attr) |