Django Middleware for fingerprinting browsers server-side. Useful for expiring auth tokens.

FingerPrintMiddleware.py

"""
    #Disclaimer
        - Use with caution
        - Don't be evil
        - Respect your users
"""

class FingerPrintMiddleware(object):
    def process_request(self, request):
        import hashlib
        fingerprint_raw = "".join(
            (request.META.get("HTTP_USER_AGENT", ""),
             request.META.get("HTTP_ACCEPT_ENCODING", ""))
        )
        request.fingerprint = hashlib.md5(
            fingerprint_raw.encode('utf-8')).hexdigest()