# This code is part of Ansible, but is an independent component.
# This particular file snippet, and this file snippet only, is BSD licensed.
# Modules you write using this snippet, which is embedded dynamically by Ansible
# still belong to the author of the module, and may assign their own license
# to the complete work.
#
# Copyright (c), Michael DeHaan <[email protected]>, 2012-2013
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import os
import re
import traceback
from ansible.module_utils.ansible_release import __version__
from ansible.module_utils.basic import missing_required_lib, env_fallback
from ansible.module_utils._text import to_native, to_text
from ansible.module_utils.cloud import CloudRetry
from ansible.module_utils.six import string_types, binary_type, text_type
from ansible.module_utils.common.dict_transformations import (
camel_dict_to_snake_dict, snake_dict_to_camel_dict,
_camel_to_snake, _snake_to_camel,
)
BOTO_IMP_ERR = None
try:
import boto
import boto.ec2 # boto does weird import stuff
HAS_BOTO = True
except ImportError:
BOTO_IMP_ERR = traceback.format_exc()
HAS_BOTO = False
BOTO3_IMP_ERR = None
try:
import boto3
import botocore
HAS_BOTO3 = True
except Exception:
BOTO3_IMP_ERR = traceback.format_exc()
HAS_BOTO3 = False
try:
# Although this is to allow Python 3 the ability to use the custom comparison as a key, Python 2.7 also
# uses this (and it works as expected). Python 2.6 will trigger the ImportError.
from functools import cmp_to_key
PY3_COMPARISON = True
except ImportError:
PY3_COMPARISON = False
class AnsibleAWSError(Exception):
pass
def _botocore_exception_maybe():
"""
Allow for boto3 not being installed when using these utils by wrapping
botocore.exceptions instead of assigning from it directly.
"""
if HAS_BOTO3:
return botocore.exceptions.ClientError
return type(None)
class AWSRetry(CloudRetry):
base_class = _botocore_exception_maybe()
@staticmethod
def status_code_from_exception(error):
return error.response['Error']['Code']
@staticmethod
def found(response_code, catch_extra_error_codes=None):
# This list of failures is based on this API Reference
# http://docs.aws.amazon.com/AWSEC2/latest/APIReference/errors-overview.html
#
# TooManyRequestsException comes from inside botocore when it
# does retrys, unfortunately however it does not try long
# enough to allow some services such as API Gateway to
# complete configuration. At the moment of writing there is a
# botocore/boto3 bug open to fix this.
#
# https://github.com/boto/boto3/issues/876 (and linked PRs etc)
retry_on = [
'RequestLimitExceeded', 'Unavailable', 'ServiceUnavailable',
'InternalFailure', 'InternalError', 'TooManyRequestsException',
'Throttling'
]
if catch_extra_error_codes:
retry_on.extend(catch_extra_error_codes)
not_found = re.compile(r'^\w+.NotFound')
return response_code in retry_on or not_found.search(response_code)
def boto3_conn(module, conn_type=None, resource=None, region=None, endpoint=None, **params):
try:
return _boto3_conn(conn_type=conn_type, resource=resource, region=region, endpoint=endpoint, **params)
except ValueError as e:
module.fail_json(msg="Couldn't connect to AWS: %s" % to_native(e))
except (botocore.exceptions.ProfileNotFound, botocore.exceptions.PartialCredentialsError,
botocore.exceptions.NoCredentialsError, botocore.exceptions.ConfigParseError) as e:
module.fail_json(msg=to_native(e))
except botocore.exceptions.NoRegionError as e:
module.fail_json(msg="The %s module requires a region and none was found in configuration, "
"environment variables or module parameters" % module._name)
def _boto3_conn(conn_type=None, resource=None, region=None, endpoint=None, **params):
profile = params.pop('profile_name', None)
if conn_type not in ['both', 'resource', 'client']:
raise ValueError('There is an issue in the calling code. You '
'must specify either both, resource, or client to '
'the conn_type parameter in the boto3_conn function '
'call')
if params.get('config'):
config = params.pop('config')
config.user_agent_extra = 'Ansible/{0}'.format(__version__)
else:
config = botocore.config.Config(
user_agent_extra='Ansible/{0}'.format(__version__),
)
session = boto3.session.Session(
profile_name=profile,
)
if conn_type == 'resource':
return session.resource(resource, config=config, region_name=region, endpoint_url=endpoint, **params)
elif conn_type == 'client':
return session.client(resource, config=config, region_name=region, endpoint_url=endpoint, **params)
else:
client = session.client(resource, region_name=region, endpoint_url=endpoint, **params)
resource = session.resource(resource, region_name=region, endpoint_url=endpoint, **params)
return client, resource
boto3_inventory_conn = _boto3_conn
def boto_exception(err):
"""
Extracts the error message from a boto exception.
:param err: Exception from boto
:return: Error message
"""
if hasattr(err, 'error_message'):
error = err.error_message
elif hasattr(err, 'message'):
error = str(err.message) + ' ' + str(err) + ' - ' + str(type(err))
else:
error = '%s: %s' % (Exception, err)
return error
def aws_common_argument_spec():
return dict(
debug_botocore_endpoint_logs=dict(fallback=(env_fallback, ['ANSIBLE_DEBUG_BOTOCORE_LOGS']), default=False, type='bool'),
ec2_url=dict(),
aws_secret_key=dict(aliases=['ec2_secret_key', 'secret_key'], no_log=True),
aws_access_key=dict(aliases=['ec2_access_key', 'access_key']),
validate_certs=dict(default=True, type='bool'),
security_token=dict(aliases=['access_token'], no_log=True),
profile=dict(),
)
def ec2_argument_spec():
spec = aws_common_argument_spec()
spec.update(
dict(
region=dict(aliases=['aws_region', 'ec2_region']),
)
)
return spec
def get_aws_connection_info(module, boto3=False):
# Check module args for credentials, then check environment vars
# access_key
ec2_url = module.params.get('ec2_url')
access_key = module.params.get('aws_access_key')
secret_key = module.params.get('aws_secret_key')
security_token = module.params.get('security_token')
region = module.params.get('region')
profile_name = module.params.get('profile')
validate_certs = module.params.get('validate_certs')
if not ec2_url:
if 'AWS_URL' in os.environ:
ec2_url = os.environ['AWS_URL']
elif 'EC2_URL' in os.environ:
ec2_url = os.environ['EC2_URL']
if not access_key:
if os.environ.get('AWS_ACCESS_KEY_ID'):
access_key = os.environ['AWS_ACCESS_KEY_ID']
elif os.environ.get('AWS_ACCESS_KEY'):
access_key = os.environ['AWS_ACCESS_KEY']
elif os.environ.get('EC2_ACCESS_KEY'):
access_key = os.environ['EC2_ACCESS_KEY']
elif HAS_BOTO and boto.config.get('Credentials', 'aws_access_key_id'):
access_key = boto.config.get('Credentials', 'aws_access_key_id')
elif HAS_BOTO and boto.config.get('default', 'aws_access_key_id'):
access_key = boto.config.get('default', 'aws_access_key_id')
else:
# in case access_key came in as empty string
access_key = None
if not secret_key:
if os.environ.get('AWS_SECRET_ACCESS_KEY'):
secret_key = os.environ['AWS_SECRET_ACCESS_KEY']
elif os.environ.get('AWS_SECRET_KEY'):
secret_key = os.environ['AWS_SECRET_KEY']
elif os.environ.get('EC2_SECRET_KEY'):
secret_key = os.environ['EC2_SECRET_KEY']
elif HAS_BOTO and boto.config.get('Credentials', 'aws_secret_access_key'):
secret_key = boto.config.get('Credentials', 'aws_secret_access_key')
elif HAS_BOTO and boto.config.get('default', 'aws_secret_access_key'):
secret_key = boto.config.get('default', 'aws_secret_access_key')
else:
# in case secret_key came in as empty string
secret_key = None
if not region:
if 'AWS_REGION' in os.environ:
region = os.environ['AWS_REGION']
elif 'AWS_DEFAULT_REGION' in os.environ:
region = os.environ['AWS_DEFAULT_REGION']
elif 'EC2_REGION' in os.environ:
region = os.environ['EC2_REGION']
else:
if not boto3:
if HAS_BOTO:
# boto.config.get returns None if config not found
region = boto.config.get('Boto', 'aws_region')
if not region:
region = boto.config.get('Boto', 'ec2_region')
else:
module.fail_json(msg=missing_required_lib('boto'), exception=BOTO_IMP_ERR)
elif HAS_BOTO3:
# here we don't need to make an additional call, will default to 'us-east-1' if the below evaluates to None.
try:
region = botocore.session.Session(profile=profile_name).get_config_variable('region')
except botocore.exceptions.ProfileNotFound as e:
pass
else:
module.fail_json(msg=missing_required_lib('boto3'), exception=BOTO3_IMP_ERR)
if not security_token:
if os.environ.get('AWS_SECURITY_TOKEN'):
security_token = os.environ['AWS_SECURITY_TOKEN']
elif os.environ.get('AWS_SESSION_TOKEN'):
security_token = os.environ['AWS_SESSION_TOKEN']
elif os.environ.get('EC2_SECURITY_TOKEN'):
security_token = os.environ['EC2_SECURITY_TOKEN']
elif HAS_BOTO and boto.config.get('Credentials', 'aws_security_token'):
security_token = boto.config.get('Credentials', 'aws_security_token')
elif HAS_BOTO and boto.config.get('default', 'aws_security_token'):
security_token = boto.config.get('default', 'aws_security_token')
else:
# in case secret_token came in as empty string
security_token = None
if HAS_BOTO3 and boto3:
boto_params = dict(aws_access_key_id=access_key,
aws_secret_access_key=secret_key,
aws_session_token=security_token)
boto_params['verify'] = validate_certs
if profile_name:
boto_params = dict(aws_access_key_id=None, aws_secret_access_key=None, aws_session_token=None)
boto_params['profile_name'] = profile_name
else:
boto_params = dict(aws_access_key_id=access_key,
aws_secret_access_key=secret_key,
security_token=security_token)
# only set profile_name if passed as an argument
if profile_name:
boto_params['profile_name'] = profile_name
boto_params['validate_certs'] = validate_certs
for param, value in boto_params.items():
if isinstance(value, binary_type):
boto_params[param] = text_type(value, 'utf-8', 'strict')
return region, ec2_url, boto_params
def get_ec2_creds(module):
''' for compatibility mode with old modules that don't/can't yet
use ec2_connect method '''
region, ec2_url, boto_params = get_aws_connection_info(module)
return ec2_url, boto_params['aws_access_key_id'], boto_params['aws_secret_access_key'], region
def boto_fix_security_token_in_profile(conn, profile_name):
''' monkey patch for boto issue boto/boto#2100 '''
profile = 'profile ' + profile_name
if boto.config.has_option(profile, 'aws_security_token'):
conn.provider.set_security_token(boto.config.get(profile, 'aws_security_token'))
return conn
def connect_to_aws(aws_module, region, **params):
try:
conn = aws_module.connect_to_region(region, **params)
except(boto.provider.ProfileNotFoundError):
raise AnsibleAWSError("Profile given for AWS was not found. Please fix and retry.")
if not conn:
if region not in [aws_module_region.name for aws_module_region in aws_module.regions()]:
raise AnsibleAWSError("Region %s does not seem to be available for aws module %s. If the region definitely exists, you may need to upgrade "
"boto or extend with endpoints_path" % (region, aws_module.__name__))
else:
raise AnsibleAWSError("Unknown problem connecting to region %s for aws module %s." % (region, aws_module.__name__))
if params.get('profile_name'):
conn = boto_fix_security_token_in_profile(conn, params['profile_name'])
return conn
def ec2_connect(module):
""" Return an ec2 connection"""
region, ec2_url, boto_params = get_aws_connection_info(module)
# If we have a region specified, connect to its endpoint.
if region:
try:
ec2 = connect_to_aws(boto.ec2, region, **boto_params)
except (boto.exception.NoAuthHandlerFound, AnsibleAWSError, boto.provider.ProfileNotFoundError) as e:
module.fail_json(msg=str(e))
# Otherwise, no region so we fallback to the old connection method
elif ec2_url:
try:
ec2 = boto.connect_ec2_endpoint(ec2_url, **boto_params)
except (boto.exception.NoAuthHandlerFound, AnsibleAWSError, boto.provider.ProfileNotFoundError) as e:
module.fail_json(msg=str(e))
else:
module.fail_json(msg="Either region or ec2_url must be specified")
return ec2
def ansible_dict_to_boto3_filter_list(filters_dict):
""" Convert an Ansible dict of filters to list of dicts that boto3 can use
Args:
filters_dict (dict): Dict of AWS filters.
Basic Usage:
>>> filters = {'some-aws-id': 'i-01234567'}
>>> ansible_dict_to_boto3_filter_list(filters)
{
'some-aws-id': 'i-01234567'
}
Returns:
List: List of AWS filters and their values
[
{
'Name': 'some-aws-id',
'Values': [
'i-01234567',
]
}
]
"""
filters_list = []
for k, v in filters_dict.items():
filter_dict = {'Name': k}
if isinstance(v, string_types):
filter_dict['Values'] = [v]
else:
filter_dict['Values'] = v
filters_list.append(filter_dict)
return filters_list
def boto3_tag_list_to_ansible_dict(tags_list, tag_name_key_name=None, tag_value_key_name=None):
""" Convert a boto3 list of resource tags to a flat dict of key:value pairs
Args:
tags_list (list): List of dicts representing AWS tags.
tag_name_key_name (str): Value to use as the key for all tag keys (useful because boto3 doesn't always use "Key")
tag_value_key_name (str): Value to use as the key for all tag values (useful because boto3 doesn't always use "Value")
Basic Usage:
>>> tags_list = [{'Key': 'MyTagKey', 'Value': 'MyTagValue'}]
>>> boto3_tag_list_to_ansible_dict(tags_list)
[
{
'Key': 'MyTagKey',
'Value': 'MyTagValue'
}
]
Returns:
Dict: Dict of key:value pairs representing AWS tags
{
'MyTagKey': 'MyTagValue',
}
"""
if tag_name_key_name and tag_value_key_name:
tag_candidates = {tag_name_key_name: tag_value_key_name}
else:
tag_candidates = {'key': 'value', 'Key': 'Value'}
if not tags_list:
return {}
for k, v in tag_candidates.items():
if k in tags_list[0] and v in tags_list[0]:
return dict((tag[k], tag[v]) for tag in tags_list)
raise ValueError("Couldn't find tag key (candidates %s) in tag list %s" % (str(tag_candidates), str(tags_list)))
def ansible_dict_to_boto3_tag_list(tags_dict, tag_name_key_name='Key', tag_value_key_name='Value'):
""" Convert a flat dict of key:value pairs representing AWS resource tags to a boto3 list of dicts
Args:
tags_dict (dict): Dict representing AWS resource tags.
tag_name_key_name (str): Value to use as the key for all tag keys (useful because boto3 doesn't always use "Key")
tag_value_key_name (str): Value to use as the key for all tag values (useful because boto3 doesn't always use "Value")
Basic Usage:
>>> tags_dict = {'MyTagKey': 'MyTagValue'}
>>> ansible_dict_to_boto3_tag_list(tags_dict)
{
'MyTagKey': 'MyTagValue'
}
Returns:
List: List of dicts containing tag keys and values
[
{
'Key': 'MyTagKey',
'Value': 'MyTagValue'
}
]
"""
tags_list = []
for k, v in tags_dict.items():
tags_list.append({tag_name_key_name: k, tag_value_key_name: to_native(v)})
return tags_list
def get_ec2_security_group_ids_from_names(sec_group_list, ec2_connection, vpc_id=None, boto3=True):
""" Return list of security group IDs from security group names. Note that security group names are not unique
across VPCs. If a name exists across multiple VPCs and no VPC ID is supplied, all matching IDs will be returned. This
will probably lead to a boto exception if you attempt to assign both IDs to a resource so ensure you wrap the call in
a try block
"""
def get_sg_name(sg, boto3):
if boto3:
return sg['GroupName']
else:
return sg.name
def get_sg_id(sg, boto3):
if boto3:
return sg['GroupId']
else:
return sg.id
sec_group_id_list = []
if isinstance(sec_group_list, string_types):
sec_group_list = [sec_group_list]
# Get all security groups
if boto3:
if vpc_id:
filters = [
{
'Name': 'vpc-id',
'Values': [
vpc_id,
]
}
]
all_sec_groups = ec2_connection.describe_security_groups(Filters=filters)['SecurityGroups']
else:
all_sec_groups = ec2_connection.describe_security_groups()['SecurityGroups']
else:
if vpc_id:
filters = {'vpc-id': vpc_id}
all_sec_groups = ec2_connection.get_all_security_groups(filters=filters)
else:
all_sec_groups = ec2_connection.get_all_security_groups()
unmatched = set(sec_group_list).difference(str(get_sg_name(all_sg, boto3)) for all_sg in all_sec_groups)
sec_group_name_list = list(set(sec_group_list) - set(unmatched))
if len(unmatched) > 0:
# If we have unmatched names that look like an ID, assume they are
import re
sec_group_id_list[:] = [sg for sg in unmatched if re.match('sg-[a-fA-F0-9]+$', sg)]
still_unmatched = [sg for sg in unmatched if not re.match('sg-[a-fA-F0-9]+$', sg)]
if len(still_unmatched) > 0:
raise ValueError("The following group names are not valid: %s" % ', '.join(still_unmatched))
sec_group_id_list += [str(get_sg_id(all_sg, boto3)) for all_sg in all_sec_groups if str(get_sg_name(all_sg, boto3)) in sec_group_name_list]
return sec_group_id_list
def _hashable_policy(policy, policy_list):
"""
Takes a policy and returns a list, the contents of which are all hashable and sorted.
Example input policy:
{'Version': '2012-10-17',
'Statement': [{'Action': 's3:PutObjectAcl',
'Sid': 'AddCannedAcl2',
'Resource': 'arn:aws:s3:::test_policy/*',
'Effect': 'Allow',
'Principal': {'AWS': ['arn:aws:iam::XXXXXXXXXXXX:user/username1', 'arn:aws:iam::XXXXXXXXXXXX:user/username2']}
}]}
Returned value:
[('Statement', ((('Action', (u's3:PutObjectAcl',)),
('Effect', (u'Allow',)),
('Principal', ('AWS', ((u'arn:aws:iam::XXXXXXXXXXXX:user/username1',), (u'arn:aws:iam::XXXXXXXXXXXX:user/username2',)))),
('Resource', (u'arn:aws:s3:::test_policy/*',)), ('Sid', (u'AddCannedAcl2',)))),
('Version', (u'2012-10-17',)))]
"""
if isinstance(policy, list):
for each in policy:
tupleified = _hashable_policy(each, [])
if isinstance(tupleified, list):
tupleified = tuple(tupleified)
policy_list.append(tupleified)
elif isinstance(policy, string_types) or isinstance(policy, binary_type):
policy = to_text(policy)
# convert root account ARNs to just account IDs
if policy.startswith('arn:aws:iam::') and policy.endswith(':root'):
policy = policy.split(':')[4]
return [policy]
elif isinstance(policy, dict):
sorted_keys = list(policy.keys())
sorted_keys.sort()
for key in sorted_keys:
tupleified = _hashable_policy(policy[key], [])
if isinstance(tupleified, list):
tupleified = tuple(tupleified)
policy_list.append((key, tupleified))
# ensure we aren't returning deeply nested structures of length 1
if len(policy_list) == 1 and isinstance(policy_list[0], tuple):
policy_list = policy_list[0]
if isinstance(policy_list, list):
if PY3_COMPARISON:
policy_list.sort(key=cmp_to_key(py3cmp))
else:
policy_list.sort()
return policy_list
def py3cmp(a, b):
""" Python 2 can sort lists of mixed types. Strings < tuples. Without this function this fails on Python 3."""
try:
if a > b:
return 1
elif a < b:
return -1
else:
return 0
except TypeError as e:
# check to see if they're tuple-string
# always say strings are less than tuples (to maintain compatibility with python2)
str_ind = to_text(e).find('str')
tup_ind = to_text(e).find('tuple')
if -1 not in (str_ind, tup_ind):
if str_ind < tup_ind:
return -1
elif tup_ind < str_ind:
return 1
raise
def compare_policies(current_policy, new_policy):
""" Compares the existing policy and the updated policy
Returns True if there is a difference between policies.
"""
return set(_hashable_policy(new_policy, [])) != set(_hashable_policy(current_policy, []))
def sort_json_policy_dict(policy_dict):
""" Sort any lists in an IAM JSON policy so that comparison of two policies with identical values but
different orders will return true
Args:
policy_dict (dict): Dict representing IAM JSON policy.
Basic Usage:
>>> my_iam_policy = {'Principle': {'AWS':["31","7","14","101"]}
>>> sort_json_policy_dict(my_iam_policy)
Returns:
Dict: Will return a copy of the policy as a Dict but any List will be sorted
{
'Principle': {
'AWS': [ '7', '14', '31', '101' ]
}
}
"""
def value_is_list(my_list):
checked_list = []
for item in my_list:
if isinstance(item, dict):
checked_list.append(sort_json_policy_dict(item))
elif isinstance(item, list):
checked_list.append(value_is_list(item))
else:
checked_list.append(item)
# Sort list. If it's a list of dictionaries, sort by tuple of key-value
# pairs, since Python 3 doesn't allow comparisons such as `<` between dictionaries.
checked_list.sort(key=lambda x: sorted(x.items()) if isinstance(x, dict) else x)
return checked_list
ordered_policy_dict = {}
for key, value in policy_dict.items():
if isinstance(value, dict):
ordered_policy_dict[key] = sort_json_policy_dict(value)
elif isinstance(value, list):
ordered_policy_dict[key] = value_is_list(value)
else:
ordered_policy_dict[key] = value
return ordered_policy_dict
def map_complex_type(complex_type, type_map):
"""
Allows to cast elements within a dictionary to a specific type
Example of usage:
DEPLOYMENT_CONFIGURATION_TYPE_MAP = {
'maximum_percent': 'int',
'minimum_healthy_percent': 'int'
}
deployment_configuration = map_complex_type(module.params['deployment_configuration'],
DEPLOYMENT_CONFIGURATION_TYPE_MAP)
This ensures all keys within the root element are casted and valid integers
"""
if complex_type is None:
return
new_type = type(complex_type)()
if isinstance(complex_type, dict):
for key in complex_type:
if key in type_map:
if isinstance(type_map[key], list):
new_type[key] = map_complex_type(
complex_type[key],
type_map[key][0])
else:
new_type[key] = map_complex_type(
complex_type[key],
type_map[key])
else:
return complex_type
elif isinstance(complex_type, list):
for i in range(len(complex_type)):
new_type.append(map_complex_type(
complex_type[i],
type_map))
elif type_map:
return globals()['__builtins__'][type_map](complex_type)
return new_type
def compare_aws_tags(current_tags_dict, new_tags_dict, purge_tags=True):
"""
Compare two dicts of AWS tags. Dicts are expected to of been created using 'boto3_tag_list_to_ansible_dict' helper function.
Two dicts are returned - the first is tags to be set, the second is any tags to remove. Since the AWS APIs differ
these may not be able to be used out of the box.
:param current_tags_dict:
:param new_tags_dict:
:param purge_tags:
:return: tag_key_value_pairs_to_set: a dict of key value pairs that need to be set in AWS. If all tags are identical this dict will be empty
:return: tag_keys_to_unset: a list of key names (type str) that need to be unset in AWS. If no tags need to be unset this list will be empty
"""
tag_key_value_pairs_to_set = {}
tag_keys_to_unset = []
for key in current_tags_dict.keys():
if key not in new_tags_dict and purge_tags:
tag_keys_to_unset.append(key)
for key in set(new_tags_dict.keys()) - set(tag_keys_to_unset):
if to_text(new_tags_dict[key]) != current_tags_dict.get(key):
tag_key_value_pairs_to_set[key] = new_tags_dict[key]
return tag_key_value_pairs_to_set, tag_keys_to_unset
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