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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
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