[GitHub] [airflow] kaxil commented on a change in pull request #6376: [AIRFLOW-5705] Add secrets backend and support for AWS SSM

[GitBox <gi...@apache.org>]

kaxil commented on a change in pull request #6376: [AIRFLOW-5705] Add secrets backend and support for AWS SSM
URL: https://github.com/apache/airflow/pull/6376#discussion_r390310469
 
 

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 File path: airflow/providers/amazon/aws/secrets/ssm.py
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+#
+# 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.
+"""
+Objects relating to sourcing connections from AWS SSM Parameter Store
+"""
+
+from typing import List, Optional
+
+import boto3
+
+from airflow.configuration import conf
+from airflow.models import Connection
+from airflow.secrets import CONN_ENV_PREFIX, BaseSecretsBackend
+
+
+class AwsSsmSecretsBackend(BaseSecretsBackend):
+    """
+    Retrieves Connection object from AWS SSM Parameter Store
+
+    Configurable via airflow config like so:
+
+    .. code-block:: ini
+
+        [secrets_backend]
+        class_list = airflow.providers.amazon.aws.secrets.ssm.AwsSsmSecretsBackend
+        aws_ssm_prefix = /airflow
+        aws_ssm_profile_name = default
+
+    For example, if ssm path is ``/airflow/AIRFLOW_CONN_SMTP_DEFAULT``, this would be accessible if you
+    provide ``aws_ssm_prefix = /airflow`` and conn_id ``smtp_default``.
+
+    """
+
+    CONF_SECTION = "secrets_backend"
+    CONF_KEY_SSM_PREFIX = "aws_ssm_prefix"
+    DEFAULT_PREFIX = "/airflow"
+    CONF_KEY_PROFILE_NAME = "aws_ssm_profile_name"
+
+    def __init__(self, *args, **kwargs):
+        pass
+
+    @property
+    def ssm_prefix(self) -> str:
+        """
+        Gets ssm prefix from conf.
+
+        Ensures that there is no trailing slash.
+
+        :return:
+        """
+        ssm_prefix = conf.get(
+            section=self.CONF_SECTION, key=self.CONF_KEY_SSM_PREFIX, fallback=self.DEFAULT_PREFIX
+        )
+        return ssm_prefix.rstrip("/")
+
+    @property
+    def aws_profile_name(self) -> Optional[str]:
+        """
+        Gets AWS profile to use from conf.
+
+        :return:
+        """
+        profile_name = conf.get(
+            section=self.CONF_SECTION, key=self.CONF_KEY_PROFILE_NAME, fallback=None
+        )
+        return profile_name or None
+
+    def build_ssm_path(self, conn_id: str):
+        """
+        Given conn_id, build SSM path.
+
+        Assumes connection params use same naming convention as env vars, but may have arbitrary prefix.
+
+        :param conn_id:
+        :return:
+        """
+        param_name = (CONN_ENV_PREFIX + conn_id).upper()
+        param_path = self.ssm_prefix + "/" + param_name
+        return param_path
+
+    def get_conn_uri(self, conn_id):
+        """
+        Get param value
+
+        :param conn_id:
+        :return:
+        """
+        session = boto3.Session(profile_name=self.aws_profile_name)
+        client = session.client("ssm")
+        response = client.get_parameter(
+            Name=self.build_ssm_path(conn_id=conn_id), WithDecryption=True
+        )
+        value = response["Parameter"]["Value"]
+        return value
+
+    def get_connections(self, conn_id) -> List[Connection]:
 
 Review comment:
   Yes, please, if we don't need instances, just make it class method

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