# -*- coding: utf-8 -*-
#
# 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 copy import deepcopy
from datetime import date, time
from airflow import AirflowException
from airflow.contrib.hooks.gcp_transfer_hook import (
GCPTransferServiceHook,
GcpTransferJobsStatus,
TRANSFER_OPTIONS,
OBJECT_CONDITIONS,
PROJECT_ID,
BUCKET_NAME,
GCS_DATA_SINK,
STATUS,
DESCRIPTION,
GCS_DATA_SOURCE,
HTTP_DATA_SOURCE,
SECONDS,
MINUTES,
HOURS,
YEAR,
MONTH,
DAY,
START_TIME_OF_DAY,
SCHEDULE_END_DATE,
SCHEDULE_START_DATE,
SCHEDULE,
SECRET_ACCESS_KEY,
ACCESS_KEY_ID,
AWS_ACCESS_KEY,
AWS_S3_DATA_SOURCE,
TRANSFER_SPEC,
)
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
try:
from airflow.contrib.hooks.aws_hook import AwsHook
except ImportError: # pragma: no cover
[docs] AwsHook = None # type: ignore
[docs]class TransferJobPreprocessor:
def __init__(self, body, aws_conn_id='aws_default'):
self.body = body
self.aws_conn_id = aws_conn_id
[docs] def _inject_aws_credentials(self):
if TRANSFER_SPEC not in self.body or AWS_S3_DATA_SOURCE not in self.body[TRANSFER_SPEC]:
return
aws_hook = AwsHook(self.aws_conn_id)
aws_credentials = aws_hook.get_credentials()
aws_access_key_id = aws_credentials.access_key
aws_secret_access_key = aws_credentials.secret_key
self.body[TRANSFER_SPEC][AWS_S3_DATA_SOURCE][AWS_ACCESS_KEY] = {
ACCESS_KEY_ID: aws_access_key_id,
SECRET_ACCESS_KEY: aws_secret_access_key,
}
[docs] def process_body(self):
self._inject_aws_credentials()
self._reformat_schedule()
return self.body
@staticmethod
[docs] def _convert_date_to_dict(field_date):
"""
Convert native python ``datetime.date`` object to a format supported by the API
"""
return {DAY: field_date.day, MONTH: field_date.month, YEAR: field_date.year}
@staticmethod
[docs] def _convert_time_to_dict(time):
"""
Convert native python ``datetime.time`` object to a format supported by the API
"""
return {HOURS: time.hour, MINUTES: time.minute, SECONDS: time.second}
[docs]class TransferJobValidator:
def __init__(self, body):
self.body = body
[docs] def _verify_data_source(self):
is_gcs = GCS_DATA_SOURCE in self.body[TRANSFER_SPEC]
is_aws_s3 = AWS_S3_DATA_SOURCE in self.body[TRANSFER_SPEC]
is_http = HTTP_DATA_SOURCE in self.body[TRANSFER_SPEC]
sources_count = sum([is_gcs, is_aws_s3, is_http])
if sources_count != 0 and sources_count != 1:
raise AirflowException(
"More than one data source detected. Please choose exactly one data source from: "
"gcsDataSource, awsS3DataSource and httpDataSource."
)
[docs] def _restrict_aws_credentials(self):
if AWS_S3_DATA_SOURCE not in self.body[TRANSFER_SPEC]:
return
if AWS_ACCESS_KEY in self.body[TRANSFER_SPEC][AWS_S3_DATA_SOURCE]:
raise AirflowException(
"AWS credentials detected inside the body parameter (awsAccessKey). This is not allowed, "
"please use Airflow connections to store credentials."
)
[docs] def _restrict_empty_body(self):
if not self.body:
raise AirflowException("The required parameter 'body' is empty or None")
[docs] def validate_body(self):
self._restrict_empty_body()
if TRANSFER_SPEC not in self.body:
return
self._restrict_aws_credentials()
self._verify_data_source()
[docs]class GcpTransferServiceJobCreateOperator(BaseOperator):
"""
Creates a transfer job that runs periodically.
.. warning::
This operator is NOT idempotent. If you run it many times, many transfer
jobs will be created in the Google Cloud Platform.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:GcpTransferServiceJobCreateOperator`
:param body: (Required) The request body, as described in
https://cloud.google.com/storage-transfer/docs/reference/rest/v1/transferJobs/create#request-body
With three additional improvements:
* dates can be given in the form :class:`datetime.date`
* times can be given in the form :class:`datetime.time`
* credentials to Amazon Web Service should be stored in the connection and indicated by the
aws_conn_id parameter
:type body: dict
:param aws_conn_id: The connection ID used to retrieve credentials to
Amazon Web Service.
:type aws_conn_id: str
:param gcp_conn_id: The connection ID used to connect to Google Cloud
Platform.
:type gcp_conn_id: str
:param api_version: API version used (e.g. v1).
:type api_version: str
"""
# [START gcp_transfer_job_create_template_fields]
[docs] template_fields = ('body', 'gcp_conn_id', 'aws_conn_id')
# [END gcp_transfer_job_create_template_fields]
@apply_defaults
def __init__(
self,
body,
aws_conn_id='aws_default',
gcp_conn_id='google_cloud_default',
api_version='v1',
*args,
**kwargs
):
super(GcpTransferServiceJobCreateOperator, self).__init__(*args, **kwargs)
self.body = deepcopy(body)
self.aws_conn_id = aws_conn_id
self.gcp_conn_id = gcp_conn_id
self.api_version = api_version
self._validate_inputs()
[docs] def execute(self, context):
TransferJobPreprocessor(body=self.body, aws_conn_id=self.aws_conn_id).process_body()
hook = GCPTransferServiceHook(api_version=self.api_version, gcp_conn_id=self.gcp_conn_id)
return hook.create_transfer_job(body=self.body)
[docs]class GcpTransferServiceJobUpdateOperator(BaseOperator):
"""
Updates a transfer job that runs periodically.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:GcpTransferServiceJobUpdateOperator`
:param job_name: (Required) Name of the job to be updated
:type job_name: str
:param body: (Required) The request body, as described in
https://cloud.google.com/storage-transfer/docs/reference/rest/v1/transferJobs/patch#request-body
With three additional improvements:
* dates can be given in the form :class:`datetime.date`
* times can be given in the form :class:`datetime.time`
* credentials to Amazon Web Service should be stored in the connection and indicated by the
aws_conn_id parameter
:type body: dict
:param aws_conn_id: The connection ID used to retrieve credentials to
Amazon Web Service.
:type aws_conn_id: str
:param gcp_conn_id: The connection ID used to connect to Google Cloud
Platform.
:type gcp_conn_id: str
:param api_version: API version used (e.g. v1).
:type api_version: str
"""
# [START gcp_transfer_job_update_template_fields]
[docs] template_fields = ('job_name', 'body', 'gcp_conn_id', 'aws_conn_id')
# [END gcp_transfer_job_update_template_fields]
@apply_defaults
def __init__(
self,
job_name,
body,
aws_conn_id='aws_default',
gcp_conn_id='google_cloud_default',
api_version='v1',
*args,
**kwargs
):
super(GcpTransferServiceJobUpdateOperator, self).__init__(*args, **kwargs)
self.job_name = job_name
self.body = body
self.gcp_conn_id = gcp_conn_id
self.api_version = api_version
self.aws_conn_id = aws_conn_id
self._validate_inputs()
[docs] def execute(self, context):
TransferJobPreprocessor(body=self.body, aws_conn_id=self.aws_conn_id).process_body()
hook = GCPTransferServiceHook(api_version=self.api_version, gcp_conn_id=self.gcp_conn_id)
return hook.update_transfer_job(job_name=self.job_name, body=self.body)
[docs]class GcpTransferServiceJobDeleteOperator(BaseOperator):
"""
Delete a transfer job. This is a soft delete. After a transfer job is
deleted, the job and all the transfer executions are subject to garbage
collection. Transfer jobs become eligible for garbage collection
30 days after soft delete.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:GcpTransferServiceJobDeleteOperator`
:param job_name: (Required) Name of the TRANSFER operation
:type job_name: str
:param project_id: (Optional) the ID of the project that owns the Transfer
Job. If set to None or missing, the default project_id from the GCP
connection is used.
:type project_id: str
:param gcp_conn_id: The connection ID used to connect to Google Cloud
Platform.
:type gcp_conn_id: str
:param api_version: API version used (e.g. v1).
:type api_version: str
"""
# [START gcp_transfer_job_delete_template_fields]
[docs] template_fields = ('job_name', 'project_id', 'gcp_conn_id', 'api_version')
# [END gcp_transfer_job_delete_template_fields]
@apply_defaults
def __init__(
self, job_name, gcp_conn_id='google_cloud_default', api_version='v1', project_id=None, *args, **kwargs
):
super(GcpTransferServiceJobDeleteOperator, self).__init__(*args, **kwargs)
self.job_name = job_name
self.project_id = project_id
self.gcp_conn_id = gcp_conn_id
self.api_version = api_version
self._validate_inputs()
[docs] def execute(self, context):
self._validate_inputs()
hook = GCPTransferServiceHook(api_version=self.api_version, gcp_conn_id=self.gcp_conn_id)
hook.delete_transfer_job(job_name=self.job_name, project_id=self.project_id)
[docs]class GcpTransferServiceOperationGetOperator(BaseOperator):
"""
Gets the latest state of a long-running operation in Google Storage Transfer
Service.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:GcpTransferServiceOperationGetOperator`
:param operation_name: (Required) Name of the transfer operation.
:type operation_name: str
:param gcp_conn_id: The connection ID used to connect to Google
Cloud Platform.
:type gcp_conn_id: str
:param api_version: API version used (e.g. v1).
:type api_version: str
"""
# [START gcp_transfer_operation_get_template_fields]
[docs] template_fields = ('operation_name', 'gcp_conn_id')
# [END gcp_transfer_operation_get_template_fields]
@apply_defaults
def __init__(self, operation_name, gcp_conn_id='google_cloud_default', api_version='v1', *args, **kwargs):
super(GcpTransferServiceOperationGetOperator, self).__init__(*args, **kwargs)
self.operation_name = operation_name
self.gcp_conn_id = gcp_conn_id
self.api_version = api_version
self._validate_inputs()
[docs] def execute(self, context):
hook = GCPTransferServiceHook(api_version=self.api_version, gcp_conn_id=self.gcp_conn_id)
operation = hook.get_transfer_operation(operation_name=self.operation_name)
return operation
[docs]class GcpTransferServiceOperationsListOperator(BaseOperator):
"""
Lists long-running operations in Google Storage Transfer
Service that match the specified filter.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:GcpTransferServiceOperationsListOperator`
:param filter: (Required) A request filter, as described in
https://cloud.google.com/storage-transfer/docs/reference/rest/v1/transferJobs/list#body.QUERY_PARAMETERS.filter
:type filter: dict
:param gcp_conn_id: The connection ID used to connect to Google
Cloud Platform.
:type gcp_conn_id: str
:param api_version: API version used (e.g. v1).
:type api_version: str
"""
# [START gcp_transfer_operations_list_template_fields]
[docs] template_fields = ('filter', 'gcp_conn_id')
# [END gcp_transfer_operations_list_template_fields]
def __init__(self, filter, gcp_conn_id='google_cloud_default', api_version='v1', *args, **kwargs):
super(GcpTransferServiceOperationsListOperator, self).__init__(*args, **kwargs)
self.filter = filter
self.gcp_conn_id = gcp_conn_id
self.api_version = api_version
self._validate_inputs()
[docs] def execute(self, context):
hook = GCPTransferServiceHook(api_version=self.api_version, gcp_conn_id=self.gcp_conn_id)
operations_list = hook.list_transfer_operations(filter=self.filter)
self.log.info(operations_list)
return operations_list
[docs]class GcpTransferServiceOperationPauseOperator(BaseOperator):
"""
Pauses a transfer operation in Google Storage Transfer Service.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:GcpTransferServiceOperationPauseOperator`
:param operation_name: (Required) Name of the transfer operation.
:type operation_name: str
:param gcp_conn_id: The connection ID used to connect to Google Cloud Platform.
:type gcp_conn_id: str
:param api_version: API version used (e.g. v1).
:type api_version: str
"""
# [START gcp_transfer_operation_pause_template_fields]
[docs] template_fields = ('operation_name', 'gcp_conn_id', 'api_version')
# [END gcp_transfer_operation_pause_template_fields]
@apply_defaults
def __init__(self, operation_name, gcp_conn_id='google_cloud_default', api_version='v1', *args, **kwargs):
super(GcpTransferServiceOperationPauseOperator, self).__init__(*args, **kwargs)
self.operation_name = operation_name
self.gcp_conn_id = gcp_conn_id
self.api_version = api_version
self._validate_inputs()
[docs] def execute(self, context):
hook = GCPTransferServiceHook(api_version=self.api_version, gcp_conn_id=self.gcp_conn_id)
hook.pause_transfer_operation(operation_name=self.operation_name)
[docs]class GcpTransferServiceOperationResumeOperator(BaseOperator):
"""
Resumes a transfer operation in Google Storage Transfer Service.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:GcpTransferServiceOperationResumeOperator`
:param operation_name: (Required) Name of the transfer operation.
:type operation_name: str
:param gcp_conn_id: The connection ID used to connect to Google Cloud Platform.
:param api_version: API version used (e.g. v1).
:type api_version: str
:type gcp_conn_id: str
"""
# [START gcp_transfer_operation_resume_template_fields]
[docs] template_fields = ('operation_name', 'gcp_conn_id', 'api_version')
# [END gcp_transfer_operation_resume_template_fields]
@apply_defaults
def __init__(self, operation_name, gcp_conn_id='google_cloud_default', api_version='v1', *args, **kwargs):
self.operation_name = operation_name
self.gcp_conn_id = gcp_conn_id
self.api_version = api_version
self._validate_inputs()
super(GcpTransferServiceOperationResumeOperator, self).__init__(*args, **kwargs)
[docs] def execute(self, context):
hook = GCPTransferServiceHook(api_version=self.api_version, gcp_conn_id=self.gcp_conn_id)
hook.resume_transfer_operation(operation_name=self.operation_name)
[docs]class GcpTransferServiceOperationCancelOperator(BaseOperator):
"""
Cancels a transfer operation in Google Storage Transfer Service.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:GcpTransferServiceOperationCancelOperator`
:param operation_name: (Required) Name of the transfer operation.
:type operation_name: str
:param api_version: API version used (e.g. v1).
:type api_version: str
:param gcp_conn_id: The connection ID used to connect to Google
Cloud Platform.
:type gcp_conn_id: str
"""
# [START gcp_transfer_operation_cancel_template_fields]
[docs] template_fields = ('operation_name', 'gcp_conn_id', 'api_version')
# [END gcp_transfer_operation_cancel_template_fields]
@apply_defaults
def __init__(self, operation_name, api_version='v1', gcp_conn_id='google_cloud_default', *args, **kwargs):
super(GcpTransferServiceOperationCancelOperator, self).__init__(*args, **kwargs)
self.operation_name = operation_name
self.api_version = api_version
self.gcp_conn_id = gcp_conn_id
self._validate_inputs()
[docs] def execute(self, context):
hook = GCPTransferServiceHook(api_version=self.api_version, gcp_conn_id=self.gcp_conn_id)
hook.cancel_transfer_operation(operation_name=self.operation_name)
[docs]class S3ToGoogleCloudStorageTransferOperator(BaseOperator):
"""
Synchronizes an S3 bucket with a Google Cloud Storage bucket using the
GCP Storage Transfer Service.
.. warning::
This operator is NOT idempotent. If you run it many times, many transfer
jobs will be created in the Google Cloud Platform.
**Example**:
.. code-block:: python
s3_to_gcs_transfer_op = S3ToGoogleCloudStorageTransferOperator(
task_id='s3_to_gcs_transfer_example',
s3_bucket='my-s3-bucket',
project_id='my-gcp-project',
gcs_bucket='my-gcs-bucket',
dag=my_dag)
:param s3_bucket: The S3 bucket where to find the objects. (templated)
:type s3_bucket: str
:param gcs_bucket: The destination Google Cloud Storage bucket
where you want to store the files. (templated)
:type gcs_bucket: str
:param project_id: Optional ID of the Google Cloud Platform Console project that
owns the job
:type project_id: str
:param aws_conn_id: The source S3 connection
:type aws_conn_id: str
:param gcp_conn_id: The destination connection ID to use
when connecting to Google Cloud Storage.
:type gcp_conn_id: str
:param delegate_to: The account to impersonate, if any.
For this to work, the service account making the request must have
domain-wide delegation enabled.
:type delegate_to: str
:param description: Optional transfer service job description
:type description: str
:param schedule: Optional transfer service schedule;
If not set, run transfer job once as soon as the operator runs
The format is described
https://cloud.google.com/storage-transfer/docs/reference/rest/v1/transferJobs.
With two additional improvements:
* dates they can be passed as :class:`datetime.date`
* times they can be passed as :class:`datetime.time`
:type schedule: dict
:param object_conditions: Optional transfer service object conditions; see
https://cloud.google.com/storage-transfer/docs/reference/rest/v1/TransferSpec
:type object_conditions: dict
:param transfer_options: Optional transfer service transfer options; see
https://cloud.google.com/storage-transfer/docs/reference/rest/v1/TransferSpec
:type transfer_options: dict
:param wait: Wait for transfer to finish
:type wait: bool
:param timeout: Time to wait for the operation to end in seconds
:type timeout: int
"""
[docs] template_fields = ('gcp_conn_id', 's3_bucket', 'gcs_bucket', 'description', 'object_conditions')
@apply_defaults
def __init__(
self,
s3_bucket,
gcs_bucket,
project_id=None,
aws_conn_id='aws_default',
gcp_conn_id='google_cloud_default',
delegate_to=None,
description=None,
schedule=None,
object_conditions=None,
transfer_options=None,
wait=True,
timeout=None,
*args,
**kwargs
):
super(S3ToGoogleCloudStorageTransferOperator, self).__init__(*args, **kwargs)
self.s3_bucket = s3_bucket
self.gcs_bucket = gcs_bucket
self.project_id = project_id
self.aws_conn_id = aws_conn_id
self.gcp_conn_id = gcp_conn_id
self.delegate_to = delegate_to
self.description = description
self.schedule = schedule
self.object_conditions = object_conditions
self.transfer_options = transfer_options
self.wait = wait
self.timeout = timeout
[docs] def execute(self, context):
hook = GCPTransferServiceHook(gcp_conn_id=self.gcp_conn_id, delegate_to=self.delegate_to)
body = self._create_body()
TransferJobPreprocessor(body=body, aws_conn_id=self.aws_conn_id).process_body()
job = hook.create_transfer_job(body=body)
if self.wait:
hook.wait_for_transfer_job(job, timeout=self.timeout)
[docs] def _create_body(self):
body = {
DESCRIPTION: self.description,
STATUS: GcpTransferJobsStatus.ENABLED,
TRANSFER_SPEC: {
AWS_S3_DATA_SOURCE: {BUCKET_NAME: self.s3_bucket},
GCS_DATA_SINK: {BUCKET_NAME: self.gcs_bucket},
},
}
if self.project_id is not None:
body[PROJECT_ID] = self.project_id
if self.schedule is not None:
body[SCHEDULE] = self.schedule
if self.object_conditions is not None:
body[TRANSFER_SPEC][OBJECT_CONDITIONS] = self.object_conditions
if self.transfer_options is not None:
body[TRANSFER_SPEC][TRANSFER_OPTIONS] = self.transfer_options
return body
[docs]class GoogleCloudStorageToGoogleCloudStorageTransferOperator(BaseOperator):
"""
Copies objects from a bucket to another using the GCP Storage Transfer
Service.
.. warning::
This operator is NOT idempotent. If you run it many times, many transfer
jobs will be created in the Google Cloud Platform.
**Example**:
.. code-block:: python
gcs_to_gcs_transfer_op = GoogleCloudStorageToGoogleCloudStorageTransferOperator(
task_id='gcs_to_gcs_transfer_example',
source_bucket='my-source-bucket',
destination_bucket='my-destination-bucket',
project_id='my-gcp-project',
dag=my_dag)
:param source_bucket: The source Google cloud storage bucket where the
object is. (templated)
:type source_bucket: str
:param destination_bucket: The destination Google cloud storage bucket
where the object should be. (templated)
:type destination_bucket: str
:param project_id: The ID of the Google Cloud Platform Console project that
owns the job
:type project_id: str
:param gcp_conn_id: Optional connection ID to use when connecting to Google Cloud
Storage.
:type gcp_conn_id: str
:param delegate_to: The account to impersonate, if any.
For this to work, the service account making the request must have
domain-wide delegation enabled.
:type delegate_to: str
:param description: Optional transfer service job description
:type description: str
:param schedule: Optional transfer service schedule;
If not set, run transfer job once as soon as the operator runs
See:
https://cloud.google.com/storage-transfer/docs/reference/rest/v1/transferJobs.
With two additional improvements:
* dates they can be passed as :class:`datetime.date`
* times they can be passed as :class:`datetime.time`
:type schedule: dict
:param object_conditions: Optional transfer service object conditions; see
https://cloud.google.com/storage-transfer/docs/reference/rest/v1/TransferSpec#ObjectConditions
:type object_conditions: dict
:param transfer_options: Optional transfer service transfer options; see
https://cloud.google.com/storage-transfer/docs/reference/rest/v1/TransferSpec#TransferOptions
:type transfer_options: dict
:param wait: Wait for transfer to finish; defaults to `True`
:type wait: bool
:param timeout: Time to wait for the operation to end in seconds
:type timeout: int
"""
[docs] template_fields = (
'gcp_conn_id',
'source_bucket',
'destination_bucket',
'description',
'object_conditions',
)
@apply_defaults
def __init__(
self,
source_bucket,
destination_bucket,
project_id=None,
gcp_conn_id='google_cloud_default',
delegate_to=None,
description=None,
schedule=None,
object_conditions=None,
transfer_options=None,
wait=True,
timeout=None,
*args,
**kwargs
):
super(GoogleCloudStorageToGoogleCloudStorageTransferOperator, self).__init__(*args, **kwargs)
self.source_bucket = source_bucket
self.destination_bucket = destination_bucket
self.project_id = project_id
self.gcp_conn_id = gcp_conn_id
self.delegate_to = delegate_to
self.description = description
self.schedule = schedule
self.object_conditions = object_conditions
self.transfer_options = transfer_options
self.wait = wait
self.timeout = timeout
[docs] def execute(self, context):
hook = GCPTransferServiceHook(gcp_conn_id=self.gcp_conn_id, delegate_to=self.delegate_to)
body = self._create_body()
TransferJobPreprocessor(body=body).process_body()
job = hook.create_transfer_job(body=body)
if self.wait:
hook.wait_for_transfer_job(job, timeout=self.timeout)
[docs] def _create_body(self):
body = {
DESCRIPTION: self.description,
STATUS: GcpTransferJobsStatus.ENABLED,
TRANSFER_SPEC: {
GCS_DATA_SOURCE: {BUCKET_NAME: self.source_bucket},
GCS_DATA_SINK: {BUCKET_NAME: self.destination_bucket},
},
}
if self.project_id is not None:
body[PROJECT_ID] = self.project_id
if self.schedule is not None:
body[SCHEDULE] = self.schedule
if self.object_conditions is not None:
body[TRANSFER_SPEC][OBJECT_CONDITIONS] = self.object_conditions
if self.transfer_options is not None:
body[TRANSFER_SPEC][TRANSFER_OPTIONS] = self.transfer_options
return body