turbaszek commented on a change in pull request #11116:
URL: https://github.com/apache/airflow/pull/11116#discussion_r494419235



##########
File path: airflow/upgrade/rules/fernet_enabled.py
##########
@@ -0,0 +1,38 @@
+# 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.
+
+from __future__ import absolute_import
+
+from airflow.configuration import conf
+from airflow.upgrade.rules.base_rule import BaseRule
+
+
+class FernetEnabledRule(BaseRule):
+    title = "Fernet is enabled by default"
+
+    description = (
+        "The fernet mechanism is enabled by default "
+        + "to increase the security of the default installation."
+    )
+
+    def check(self):
+        fernet_key = conf.get("core", "fernet_key")
+        if not fernet_key:
+            return """fernet_key in airflow.cfg must be explicitly set empty 
as fernet mechanism is enabled by default
+        this means that the apache-airflow[crypto] extra-packages are always 
installed.
+        However, this requires that your operating system has libffi-dev 
installed.
+        """

Review comment:
       ```suggestion
               return "fernet_key in airflow.cfg must be explicitly set empty 
as fernet mechanism" \
                   " is enabled by default this means that the 
apache-airflow[crypto] extra-packages" \
                   " are always installed. However, this requires that your 
operating system has libffi-dev installed."
   ```
   This should make the message one liner (it's important for json formatter). 
Currently it looks a bit unhealthy 😄 
   ![Uploading Screenshot 2020-09-24 at 17.38.28.png…]()
   




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