import time import sha import random import binascii import string import gobject class GObjectSingletonMeta(gobject.GObjectMeta): """GObject Singleton Metaclass""" def __init__(klass, name, bases, dict): gobject.GObjectMeta.__init__(klass, name, bases, dict) klass.__instance = None def __call__(klass, *args, **kwargs): if klass.__instance is None: klass.__instance = gobject.GObjectMeta.__call__(klass, *args, **kwargs) return klass.__instance def printable_hash(in_hash): """Convert binary hash data into printable characters.""" printable = "" for char in in_hash: printable = printable + binascii.b2a_hex(char) return printable def _sha_data(data): """sha1 hash some bytes.""" sha_hash = sha.new() sha_hash.update(data) return sha_hash.digest() def unique_id(data = ''): data_string = "%s%s%s" % (time.time(), random.randint(10000, 100000), data) return printable_hash(_sha_data(data_string)) ACTIVITY_ID_LEN = 40 def is_hex(s): return s.strip(string.hexdigits) == '' def validate_activity_id(actid): """Validate an activity ID.""" if not isinstance(actid, str) and not isinstance(actid, unicode): return False if len(actid) != ACTIVITY_ID_LEN: return False if not is_hex(actid): return False return True