Fix a regression that mapping providers should be able to redirect users. (#8878)

This was broken in #8801.

2 files changed, 29 insertions, 2 deletions

diff --git a/tests/handlers/test_oidc.py b/tests/handlers/test_oidc.py
index d485af52fd..a308c46da9 100644
--- a/tests/handlers/test_oidc.py
+++ b/tests/handlers/test_oidc.py
@@ -705,8 +705,7 @@ class OidcHandlerTestCase(HomeserverTestCase):
             MappingException,
         )
         self.assertEqual(
-            str(e.value),
-            "Could not extract user attributes from SSO response: Mapping provider does not support de-duplicating Matrix IDs",
+            str(e.value), "Mapping provider does not support de-duplicating Matrix IDs",
         )
 
     @override_config({"oidc_config": {"allow_existing_users": True}})
diff --git a/tests/handlers/test_saml.py b/tests/handlers/test_saml.py
index e1e13a5faf..45dc17aba5 100644
--- a/tests/handlers/test_saml.py
+++ b/tests/handlers/test_saml.py
@@ -14,6 +14,7 @@
 
 import attr
 
+from synapse.api.errors import RedirectException
 from synapse.handlers.sso import MappingException
 
 from tests.unittest import HomeserverTestCase, override_config
@@ -49,6 +50,13 @@ class TestMappingProvider:
         return {"mxid_localpart": localpart, "displayname": None}
 
 
+class TestRedirectMappingProvider(TestMappingProvider):
+    def saml_response_to_user_attributes(
+        self, saml_response, failures, client_redirect_url
+    ):
+        raise RedirectException(b"https://custom-saml-redirect/")
+
+
 class SamlHandlerTestCase(HomeserverTestCase):
     def default_config(self):
         config = super().default_config()
@@ -166,3 +174,23 @@ class SamlHandlerTestCase(HomeserverTestCase):
         self.assertEqual(
             str(e.value), "Unable to generate a Matrix ID from the SSO response"
         )
+
+    @override_config(
+        {
+            "saml2_config": {
+                "user_mapping_provider": {
+                    "module": __name__ + ".TestRedirectMappingProvider"
+                },
+            }
+        }
+    )
+    def test_map_saml_response_redirect(self):
+        saml_response = FakeAuthnResponse({"uid": "test", "username": "test_user"})
+        redirect_url = ""
+        e = self.get_failure(
+            self.handler._map_saml_response_to_user(
+                saml_response, redirect_url, "user-agent", "10.10.10.10"
+            ),
+            RedirectException,
+        )
+        self.assertEqual(e.value.location, b"https://custom-saml-redirect/")