paulo@78: import urlparse
paulo@78: 
paulo@78: 
paulo@78: PIN_KEY = "llpin"
paulo@78: PIN_FN = "_%s" % PIN_KEY
paulo@78: 
paulo@78: 
paulo@78: class PinFailError(Exception):
paulo@78: 	pass
paulo@78: 
paulo@78: 
paulo@78: def load():
paulo@78: 	ret = None
paulo@78: 
paulo@78: 	try:
paulo@78: 		with open(PIN_FN) as pin_f:
paulo@78: 			ret = pin_f.read().strip()
paulo@78: 	except IOError:
paulo@78: 		pass
paulo@78: 
paulo@78: 	return ret
paulo@78: 
paulo@78: 
paulo@78: def parse_cookies(environ):
paulo@78: 	return urlparse.parse_qs(environ.get("HTTP_COOKIE", ""))
paulo@78: 
paulo@78: 
paulo@78: def check(cookies):
paulo@78: 	if PIN_KEY not in cookies:
paulo@78: 		raise PinFailError()
paulo@78: 
paulo@78: 	pin = cookies[PIN_KEY][0]
paulo@78: 	if pin != load():
paulo@78: 		raise PinFailError()
paulo@78: 
paulo@78: 	return pin