def __init__(self, handle_server_url, username, password, prefix=None, handleowner=None, **config):
'''
Initialize client credentials instance with Handle server url,
username and password.
:param handle_server_url: URL to your handle server
:param username: User information in the format "index:prefix/suffix"
:param password: Password.
:param prefix: Prefix.
:param config: Any key-value pairs added are stored as config.
:raises: HandleSyntaxError
'''
EUDATHandleClient.check_handle_syntax_with_index(username)
self.__handle_server_url = handle_server_url
self.__username = username
self.__password = password
self.__prefix = prefix
self.__handleowner = handleowner
self.__config = None
if len(config) > 0:
self.__config = config
if handleowner is not None:
EUDATHandleClient.check_handle_syntax_with_index(handleowner)
self.__handleowner = handleowner
