code: def __init__(self, access_key, secret_key, session, expiration):
      logging.debug("constructing token")
      self._access_key = access_key
      self._secret_key = secret_key
      self._session = session
      self._expiration = expiration
  
file_path: datalad/datalad/support/third/nda_aws_token_generator.py
imports: import binascii
  import hashlib
  import logging
  import xml.etree.ElementTree
  import sys
label_desc: Use image node_id 1 to create a new Token object  with example: obj = Token(access_key, secret_key, session, expiration)