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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 _stringify_sha(sha_hash):
"""Convert binary sha1 hash data into printable characters."""
print_sha = ""
for char in sha_hash:
print_sha = print_sha + binascii.b2a_hex(char)
return print_sha
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 _stringify_sha(_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 type(actid) != type("") and type(actid) != type(u""):
return False
if len(actid) != ACTIVITY_ID_LEN:
return False
if not is_hex(actid):
return False
return True
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