feat(auth): add OAuth token revocation (RFC 7009)

auth.oauth.revoke(token, client_id, token_type_hint=None) POSTs
/auth/v1/oauth/revoke, the endpoint campus-cli still raw-calls.
The server returns 200 {} regardless of token state (RFC 7009 §2.2);
errors (missing token, invalid client) surface as APIError subclasses
via raise_for_status.

Fixes #73

Author: ngjunsiang

campus_python/auth/v1/oauth.py

@@ -158,3 +158,30 @@ def authorize_device(
         )
         resp.raise_for_status()
         return resp.json()
+
+    def revoke(
+            self,
+            token: str,
+            client_id: str,
+            token_type_hint: "str | None" = None,
+    ) -> None:
+        """Revoke an access or refresh token (RFC 7009).
+
+        Args:
+            token: The access or refresh token to revoke
+            client_id: The OAuth client the token was issued to
+            token_type_hint: Optional "access_token" or "refresh_token"
+
+        Per RFC 7009 section 2.2 the server returns 200 regardless of
+        whether the token was found or already revoked, so callers
+        cannot use this endpoint to confirm a token's validity.
+        """
+        json_body: dict = {
+            "token": token,
+            "client_id": client_id,
+        }
+        if token_type_hint is not None:
+            json_body["token_type_hint"] = token_type_hint
+        resp = self.client.post(self.make_path("revoke"), json=json_body)
+        resp.raise_for_status()
+        return None

tests/unit/test_oauth_revoke.py

@@ -0,0 +1,52 @@
+"""Contract tests for OAuth token revocation (RFC 7009, issue #73).
+
+The device flow moved in-library with the PR #70 fix sweep, but
+campus-cli still raw-calls POST /auth/v1/oauth/revoke. The endpoint is
+registered as the leaf path /oauth/revoke (campus/auth/routes/
+oauth.py; the auth app sets strict_slashes) and returns 200 {} per
+RFC 7009 section 2.2 regardless of token state.
+"""
+
+import unittest
+from unittest.mock import Mock
+
+from campus_python.auth.v1 import AuthRoot
+
+
+def make_auth() -> tuple[AuthRoot, Mock]:
+    """Create an AuthRoot backed by a mock JSON client."""
+    client = Mock()
+    return AuthRoot(json_client=client), client
+
+
+class TestOAuthRevoke(unittest.TestCase):
+    """auth.oauth.revoke() must POST the /oauth/revoke leaf route."""
+
+    def setUp(self):
+        self.auth, self.client = make_auth()
+
+    def test_revoke_posts_token_and_client_id(self):
+        self.auth.oauth.revoke(token="tok-1", client_id="campus-cli")
+        self.client.post.assert_called_once_with(
+            "/auth/v1/oauth/revoke",
+            json={"token": "tok-1", "client_id": "campus-cli"},
+        )
+
+    def test_revoke_sends_token_type_hint_when_given(self):
+        self.auth.oauth.revoke(
+            token="tok-1",
+            client_id="campus-cli",
+            token_type_hint="refresh_token",
+        )
+        self.assertEqual(
+            self.client.post.call_args.kwargs["json"],
+            {
+                "token": "tok-1",
+                "client_id": "campus-cli",
+                "token_type_hint": "refresh_token",
+            },
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()