def guess_datetime(value):
if value:
value = to_string(value)
for pattern in DATETIME_PATTERNS:
try:
datetime_value = STRING_TO_DATETIME(value, pattern)
except ValueError:
pass
else:
return datetime_value
def maybe_datetime(value, date_format='%Y-%m-%d %H:%M:%S'):
if isinstance(value, DATETIME):
return value
elif isinstance(value, DATE):
return COMBINE_DATETIME(value, EMPTY_TIME)
value = to_string(value)
try:
result = STRING_TO_DATETIME(value, date_format)
except (TypeError, ValueError):
date_value = maybe_date(value)
if date_value:
return COMBINE_DATETIME(date_value, EMPTY_TIME)
else:
return result
def inject_junk(value):
# TODO use hmac
value = to_string(value)
if len(value) < 6:
orders = list('987654')
else:
orders = list()
blocks = list(value)
for order in blocks:
orders.extend(str(ord(order)))
junk_code = '1234qwerty'
while orders:
order = int(orders.pop(0))
# Inject some junk
position = int(ceil(len(blocks) / (order + 1.)))
blocks.insert(position, junk_code[order])
return ''.join(blocks)
