def _list_single_object(self, s3_path):
# When we know we're dealing with a single object, we can avoid
# a ListObjects operation (which causes concern for anyone setting
# IAM policies with the smallest set of permissions needed) and
# instead use a HeadObject request.
if self.operation_name == 'delete':
# If the operation is just a single remote delete, there is
# no need to run HeadObject on the S3 object as none of the
# information gained from HeadObject is required to delete the
# object.
return s3_path, {'Size': None, 'LastModified': None}
bucket, key = find_bucket_key(s3_path)
try:
params = {'Bucket': bucket, 'Key': key}
params.update(self.request_parameters.get('HeadObject', {}))
response = self._client.head_object(**params)
except ClientError as e:
# We want to try to give a more helpful error message.
# This is what the customer is going to see so we want to
# give as much detail as we have.
if not e.response['Error']['Code'] == '404':
raise
# The key does not exist so we'll raise a more specific
# error message here.
response = e.response.copy()
response['Error']['Message'] = 'Key "%s" does not exist' % key
raise ClientError(response, 'HeadObject')
response['Size'] = int(response.pop('ContentLength'))
last_update = parse(response['LastModified'])
response['LastModified'] = last_update.astimezone(tzlocal())
return s3_path, response
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