def region_from_key_id(signingKeyId, default_region=None):
try:
region_name = signingKeyId.split(":", 4)[3]
except IndexError:
if default_region is None:
raise UnknownRegionError(
"No default region found and no region determinable from key id: {}"
.format(signingKeyId))
region_name = default_region
return region_name
def __call__(self, region_name):
# type: (Union[None, str]) -> BaseClient
"""Return a client for the requested region.
:rtype: BaseClient
:raises UnknownRegionError: if a region is requested that is in ``denied_regions``
"""
if region_name in self.denied_regions:
raise UnknownRegionError(
"Unable to provide client for region '{}'".format(region_name))
return self._client_supplier(region_name)
def _client(self, key_id):
"""Returns a Boto3 KMS client for the appropriate region.
:param str key_id: KMS CMK ID
"""
try:
region_name = key_id.split(':', 4)[3]
if self.default_region is None:
self.default_region = region_name
except IndexError:
if self.default_region is None:
raise UnknownRegionError(
'No default region found and no region determinable from key id: {}'
.format(key_id))
region_name = self.default_region
self.add_regional_client(region_name)
return self._regional_clients[region_name]
def _region_from_key_id(key_id, default_region=None):
"""Determine the target region from a key ID, falling back to a default region if provided.
:param str key_id: AWS KMS key ID
:param str default_region: Region to use if no region found in key_id
:returns: region name
:rtype: str
:raises UnknownRegionError: if no region found in key_id and no default_region provided
"""
try:
region_name = key_id.split(":", 4)[3]
except IndexError:
if default_region is None:
raise UnknownRegionError(
"No default region found and no region determinable from key id: {}"
.format(key_id))
region_name = default_region
return region_name