| import os, random |
| |
| |
| def unique_id(cookie_key): |
| """ |
| Find out if remote caller has cookie set on the key. |
| If not, set cookie on client side: evaluate this key by a random string. |
| ( unique user identifier ) |
| In both scenarios return value of the cookie, be it old or newly set one |
| """ |
| uid = '' |
| ## try to retrieve uid from Cookie |
| if 'HTTP_COOKIE' in os.environ: |
| ## parse os.environ['HTTP_COOKIE'] |
| cookies = os.environ['HTTP_COOKIE'].split(';') |
| key = '%s=' % cookie_key |
| uid_cookies = [c for c in cookies if c.strip().startswith(key)] |
| |
| if uid_cookies: |
| assert(len(uid_cookies) == 1) |
| uid_cookie = uid_cookies[0] |
| uid = uid_cookie.replace(key, '') |
| |
| if not uid: |
| uid = str(random.random())[2:16] # random string of 14 digits |
| set_cookie_statement = 'Set-Cookie:%s=%s;' % (cookie_key, uid) |
| set_cookie_statement += 'expires=Thu, 26-Dec-2013 22:03:25 GMT;' |
| print set_cookie_statement |
| |
| return uid |
