Added exp claim for JWT token

websockify/token_plugins.py

@@ -1,5 +1,6 @@
 import os
 import sys
+import time
 
 class BasePlugin():
     def __init__(self, src):
@@ -128,6 +129,12 @@ class JWTTokenApi(BasePlugin):
 
                 parsed = json.loads(token.claims)
                 
+                if 'exp' in parsed:
+                    # Expiration time is present, so we need to check it
+                    if time.time() > parsed['exp']:
+                        print('Token has expired!', file=sys.stderr)
+                        return None
+
                 return (parsed['host'], parsed['port'])
             except Exception as e:
                 print("Failed to parse token: %s" % str(e), file=sys.stderr)