1 files changed, 20 insertions, 0 deletions
diff --git a/gn_auth/auth/authentication/oauth2/models/jwt_bearer_token.py b/gn_auth/auth/authentication/oauth2/models/jwt_bearer_token.py
index cca75f4..71769e1 100644
--- a/gn_auth/auth/authentication/oauth2/models/jwt_bearer_token.py
+++ b/gn_auth/auth/authentication/oauth2/models/jwt_bearer_token.py
@@ -1,5 +1,7 @@
 """Implement model for JWTBearerToken"""
 import uuid
+import time
+from typing import Optional
 
 from authlib.oauth2.rfc7523 import JWTBearerToken as _JWTBearerToken
 
@@ -28,3 +30,21 @@ class JWTBearerToken(_JWTBearerToken):
     def check_client(self, client):
         """Check that the client is right."""
         return self.client.get_client_id() == client.get_client_id()
+
+
+    def get_expires_in(self) -> Optional[int]:
+        """Return the number of seconds the token is valid for since issue.
+
+        If `None`, the token never expires."""
+        if "exp" in self:
+            return self['exp'] - self['iat']
+        return None
+
+
+    def is_expired(self):
+        """Check whether the token is expired.
+
+        If there is no 'exp' member, assume this token will never expire."""
+        if "exp" in self:
+            return self["exp"] < time.time()
+        return False