fix(in-person): redirect to index on tokenize cancel

instead of keeping the user in an endless loop of redirects from the
auto-redirect on the Switchio enrollment index, when a user cancels
tokenization in the Switchio gateway by clicking "Back", send them to
the admin index

this is similar to how the "Cancel" button for Littlepay works

Author: thekaveman

benefits/in_person/views.py

@@ -216,3 +216,11 @@ def get_context_data(self, **kwargs):
             }
         )
         return context
+
+    def get(self, request, *args, **kwargs):
+        if request.GET.get("error") == "canceled":
+            # the user clicked the "Back" button on the Switchio tokenization gateway
+            # send them back to the Admin index, similar to the Littlepay cancel button
+            return redirect(routes.ADMIN_INDEX)
+
+        return super().get(request, *args, **kwargs)

tests/pytest/in_person/test_views.py

@@ -285,3 +285,11 @@ def test_get_context_data__post_tokenize(self, view: views.SwitchioEnrollmentInd
         context = view.get_context_data()
 
         assert context["loading_message"] == "Registering this contactless card for reduced fares..."
+
+    def test_get__cancel_tokenize(self, view: views.SwitchioEnrollmentIndexView, app_request):
+        app_request.GET = {"error": "canceled"}
+
+        response = view.get(app_request)
+
+        assert response.status_code == 302
+        assert response.url == reverse(routes.ADMIN_INDEX)