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