diff --git a/tests/handlers/test_oauth_delegation.py b/tests/handlers/test_oauth_delegation.py
index 6309d7b36e..82c26e303f 100644
--- a/tests/handlers/test_oauth_delegation.py
+++ b/tests/handlers/test_oauth_delegation.py
@@ -491,6 +491,68 @@ class MSC3861OAuthDelegation(HomeserverTestCase):
error = self.get_failure(self.auth.get_user_by_req(request), SynapseError)
self.assertEqual(error.value.code, 503)
+ def test_introspection_token_cache(self) -> None:
+ access_token = "open_sesame"
+ self.http_client.request = simple_async_mock(
+ return_value=FakeResponse.json(
+ code=200,
+ payload={"active": "true", "scope": "guest", "jti": access_token},
+ )
+ )
+
+ # first call should cache response
+ # Mpyp ignores below are due to mypy not understanding the dynamic substitution of msc3861 auth code
+ # for regular auth code via the config
+ self.get_success(
+ self.auth._introspect_token(access_token) # type: ignore[attr-defined]
+ )
+ introspection_token = self.auth._token_cache.get(access_token) # type: ignore[attr-defined]
+ self.assertEqual(introspection_token["jti"], access_token)
+ # there's been one http request
+ self.http_client.request.assert_called_once()
+
+ # second call should pull from cache, there should still be only one http request
+ token = self.get_success(self.auth._introspect_token(access_token)) # type: ignore[attr-defined]
+ self.http_client.request.assert_called_once()
+ self.assertEqual(token["jti"], access_token)
+
+ # advance past five minutes and check that cache expired - there should be more than one http call now
+ self.reactor.advance(360)
+ token_2 = self.get_success(self.auth._introspect_token(access_token)) # type: ignore[attr-defined]
+ self.assertEqual(self.http_client.request.call_count, 2)
+ self.assertEqual(token_2["jti"], access_token)
+
+ # test that if a cached token is expired, a fresh token will be pulled from authorizing server - first add a
+ # token with a soon-to-expire `exp` field to the cache
+ self.http_client.request = simple_async_mock(
+ return_value=FakeResponse.json(
+ code=200,
+ payload={
+ "active": "true",
+ "scope": "guest",
+ "jti": "stale",
+ "exp": self.clock.time() + 100,
+ },
+ )
+ )
+ self.get_success(
+ self.auth._introspect_token("stale") # type: ignore[attr-defined]
+ )
+ introspection_token = self.auth._token_cache.get("stale") # type: ignore[attr-defined]
+ self.assertEqual(introspection_token["jti"], "stale")
+ self.assertEqual(self.http_client.request.call_count, 1)
+
+ # advance the reactor past the token expiry but less than the cache expiry
+ self.reactor.advance(120)
+ self.assertEqual(self.auth._token_cache.get("stale"), introspection_token) # type: ignore[attr-defined]
+
+ # check that the next call causes another http request (which will fail because the token is technically expired
+ # but the important thing is we discard the token from the cache and try the network)
+ self.get_failure(
+ self.auth._introspect_token("stale"), InvalidClientTokenError # type: ignore[attr-defined]
+ )
+ self.assertEqual(self.http_client.request.call_count, 2)
+
def make_device_keys(self, user_id: str, device_id: str) -> JsonDict:
# We only generate a master key to simplify the test.
master_signing_key = generate_signing_key(device_id)
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