Common code for handling 403s in routes

ui/app/mixins/with-forbidden-state.js

@@ -0,0 +1,18 @@
+import Ember from 'ember';
+
+const { Mixin } = Ember;
+
+export default Mixin.create({
+  setupController(controller) {
+    if (this.get('isForbidden')) {
+      this.set('isForbidden', undefined);
+      controller.set('isForbidden', true);
+    }
+    this._super(...arguments);
+  },
+
+  resetController(controller) {
+    controller.set('isForbidden', false);
+    this._super(...arguments);
+  },
+});

ui/app/utils/notify-forbidden.js

@@ -0,0 +1,12 @@
+// An error handler to provide to a promise catch to set a
+// forbidden flag on the route
+import codesForError from './codes-for-error';
+export default function notifyForbidden(route) {
+  return error => {
+    if (codesForError(error).includes('403')) {
+      route.set('isForbidden', true);
+    } else {
+      throw error;
+    }
+  };
+}