def lookup(token, options = {})
      headers = extract_headers!(options)
      json = client.post("/v1/auth/token/lookup", JSON.fast_generate(
        token: token,
      ), headers)
      return Secret.decode(json)
    end
def lookup(token, options = {})
      headers = extract_headers!(options)
      json = client.post("/v1/auth/token/lookup", JSON.fast_generate(
        token: token,
      ), headers)
      return Secret.decode(json)
    end
Lookup information about the current token.

 @example
   Vault.auth_token.lookup("abcd-...") #=> #<Vault::Secret lease_id="">

 @param [String] token
 @param [Hash] options

 @return [Secret]