1from datasette import hookimpl 

2from itsdangerous import BadSignature 

3import baseconv 

4import time 

5 

6 

7@hookimpl 

8def actor_from_request(datasette, request): 

9 if "ds_actor" not in request.cookies: 

10 return None 

11 try: 

12 decoded = datasette.unsign(request.cookies["ds_actor"], "actor") 

13 # If it has "e" and "a" keys process the "e" expiry 

14 if not isinstance(decoded, dict) or "a" not in decoded: 

15 return None 

16 expires_at = decoded.get("e") 

17 if expires_at: 

18 timestamp = int(baseconv.base62.decode(expires_at)) 

19 if time.time() > timestamp: 

20 return None 

21 return decoded["a"] 

22 except BadSignature: 

23 return None