1# Lint as: python2, python3 2from __future__ import division 3from __future__ import print_function 4import os, random 5 6 7def unique_id(cookie_key): 8 """ 9 Find out if remote caller has cookie set on the key. 10 If not, set cookie on client side: evaluate this key by a random string. 11 ( unique user identifier ) 12 In both scenarios return value of the cookie, be it old or newly set one 13 """ 14 uid = '' 15 ## try to retrieve uid from Cookie 16 if 'HTTP_COOKIE' in os.environ: 17 ## parse os.environ['HTTP_COOKIE'] 18 cookies = os.environ['HTTP_COOKIE'].split(';') 19 key = '%s=' % cookie_key 20 uid_cookies = [c for c in cookies if c.strip().startswith(key)] 21 22 if uid_cookies: 23 assert(len(uid_cookies) == 1) 24 uid_cookie = uid_cookies[0] 25 uid = uid_cookie.replace(key, '') 26 27 if not uid: 28 uid = str(random.random())[2:16] # random string of 14 digits 29 set_cookie_statement = 'Set-Cookie:%s=%s;' % (cookie_key, uid) 30 set_cookie_statement += 'expires=Thu, 26-Dec-2013 22:03:25 GMT;' 31 print(set_cookie_statement) 32 33 return uid 34