tenants: fix tenant not being queried correctly when using accessing over a child domain

closes #1044

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/tenants/tests.py

@@ -23,6 +23,25 @@ class TestTenants(TestCase):
             },
         )
 
+    def test_tenant_subdomain(self):
+        """Test Current tenant API"""
+        Tenant.objects.all().delete()
+        Tenant.objects.create(domain="bar.baz", branding_title="custom")
+        self.assertJSONEqual(
+            force_str(
+                self.client.get(
+                    reverse("authentik_api:tenant-current"), HTTP_HOST="foo.bar.baz"
+                ).content
+            ),
+            {
+                "branding_logo": "/static/dist/assets/icons/icon_left_brand.svg",
+                "branding_favicon": "/static/dist/assets/icons/icon.png",
+                "branding_title": "custom",
+                "matched_domain": "bar.baz",
+                "ui_footer_links": CONFIG.y("authentik.footer_links"),
+            },
+        )
+
     def test_fallback(self):
         """Test fallback tenant"""
         Tenant.objects.all().delete()