Source code for airflow.providers.amazon.aws.transfers.s3_to_sftp

#
# 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 tempfile import NamedTemporaryFile
from typing import TYPE_CHECKING, Sequence
from urllib.parse import urlparse

from airflow.models import BaseOperator
from airflow.providers.amazon.aws.hooks.s3 import S3Hook
from airflow.providers.ssh.hooks.ssh import SSHHook

if TYPE_CHECKING:
    from airflow.utils.context import Context


[docs]class S3ToSFTPOperator(BaseOperator):
    """
    This operator enables the transferring of files from S3 to a SFTP server.

    .. seealso::
        For more information on how to use this operator, take a look at the guide:
        :ref:`howto/operator:S3ToSFTPOperator`

    :param sftp_conn_id: The sftp connection id. The name or identifier for
        establishing a connection to the SFTP server.
    :type sftp_conn_id: str
    :param sftp_path: The sftp remote path. This is the specified file path for
        uploading file to the SFTP server.
    :type sftp_path: str
    :param s3_conn_id: The s3 connection id. The name or identifier for
        establishing a connection to S3
    :type s3_conn_id: str
    :param s3_bucket: The targeted s3 bucket. This is the S3 bucket from
        where the file is downloaded.
    :type s3_bucket: str
    :param s3_key: The targeted s3 key. This is the specified file path for
        downloading the file from S3.
    :type s3_key: str
    """

[docs]    template_fields: Sequence[str] = ('s3_key', 'sftp_path')

    def __init__(
        self,
        *,
        s3_bucket: str,
        s3_key: str,
        sftp_path: str,
        sftp_conn_id: str = 'ssh_default',
        s3_conn_id: str = 'aws_default',
        **kwargs,
    ) -> None:
        super().__init__(**kwargs)
        self.sftp_conn_id = sftp_conn_id
        self.sftp_path = sftp_path
        self.s3_bucket = s3_bucket
        self.s3_key = s3_key
        self.s3_conn_id = s3_conn_id

    @staticmethod
[docs]    def get_s3_key(s3_key: str) -> str:
        """This parses the correct format for S3 keys regardless of how the S3 url is passed."""
        parsed_s3_key = urlparse(s3_key)
        return parsed_s3_key.path.lstrip('/')

[docs]    def execute(self, context: 'Context') -> None:
        self.s3_key = self.get_s3_key(self.s3_key)
        ssh_hook = SSHHook(ssh_conn_id=self.sftp_conn_id)
        s3_hook = S3Hook(self.s3_conn_id)

        s3_client = s3_hook.get_conn()
        sftp_client = ssh_hook.get_conn().open_sftp()

        with NamedTemporaryFile("w") as f:
            s3_client.download_file(self.s3_bucket, self.s3_key, f.name)
            sftp_client.put(f.name, self.sftp_path)