feat(nimbus): Show rejection message

experimenter/experimenter/experiments/models.py

@@ -730,6 +730,28 @@ def should_show_remote_settings_pending(self, reviewer):
             self.PublishStatus.WAITING,
         ) and self.can_review(reviewer)
 
+    @property
+    def rejection_block(self):
+        rejection = self.changes.latest_rejection()
+        if not rejection:
+            return None
+
+        flow_key = None
+        if rejection.old_status == self.Status.DRAFT:
+            flow_key = "LAUNCH_EXPERIMENT"
+        elif rejection.old_status == self.Status.LIVE:
+            if rejection.old_status_next == self.Status.LIVE:
+                flow_key = "END_ENROLLMENT"
+            else:
+                flow_key = "END_EXPERIMENT"
+
+        return {
+            "action": NimbusUIConstants.REVIEW_REQUEST_MESSAGES[flow_key],
+            "email": rejection.changed_by.email,
+            "date": rejection.changed_on,
+            "message": rejection.message,
+        }
+
     def review_messages(self):
         if self.status_next == self.Status.COMPLETE:
             return NimbusUIConstants.REVIEW_REQUEST_MESSAGES["END_EXPERIMENT"]

experimenter/experimenter/experiments/tests/test_models.py

@@ -3758,6 +3758,56 @@ def test_review_messages_and_action_type(self, lifecycle, expected_message):
         experiment = NimbusExperimentFactory.create_with_lifecycle(lifecycle)
         self.assertEqual(experiment.review_messages(), expected_message)
 
+    @parameterized.expand(
+        [
+            (
+                NimbusExperiment.Status.DRAFT,
+                None,
+                "LAUNCH_EXPERIMENT",
+            ),
+            (
+                NimbusExperiment.Status.LIVE,
+                NimbusExperiment.Status.LIVE,
+                "END_ENROLLMENT",
+            ),
+            (
+                NimbusExperiment.Status.LIVE,
+                NimbusExperiment.Status.COMPLETE,
+                "END_EXPERIMENT",
+            ),
+        ]
+    )
+    def test_rejection_block_from_rejection_changelog(
+        self,
+        status,
+        status_next,
+        expected_flow_key,
+    ):
+        experiment = NimbusExperimentFactory.create_with_lifecycle(
+            NimbusExperimentFactory.Lifecycles.CREATED
+        )
+
+        experiment.status = status
+        experiment.status_next = status_next
+
+        for publish_status in (
+            NimbusExperiment.PublishStatus.REVIEW,
+            NimbusExperiment.PublishStatus.IDLE,
+        ):
+            experiment.publish_status = publish_status
+            experiment.save()
+            generate_nimbus_changelog(experiment, experiment.owner, "test message")
+
+        block = experiment.rejection_block
+        assert block is not None
+        assert (
+            block["action"]
+            == NimbusUIConstants.REVIEW_REQUEST_MESSAGES[expected_flow_key]
+        )
+        assert block["email"] == experiment.changes.latest_rejection().changed_by.email
+        assert block["date"] == experiment.changes.latest_rejection().changed_on
+        assert block["message"] == "test message"
+
 
 class TestNimbusBranch(TestCase):
     def test_str(self):

experimenter/experimenter/nimbus_ui_new/templates/nimbus_experiments/launch_controls.html

@@ -1,6 +1,21 @@
 {% load nimbus_extras %}
 
 <div id="launch-controls">
+  {% with rejection=experiment.rejection_block %}
+    {% if rejection %}
+      <div class="alert alert-warning"
+           id="rejection-reason"
+           data-testid="rejection-notice">
+        <div class="text-body">
+          <p class="mb-2">
+            The request to {{ rejection.action }} was <strong>Rejected</strong> due to:
+          </p>
+          <p class="mb-2">{{ rejection.email }} on {{ rejection.date|date:"F j, Y" }}:</p>
+          <p class="bg-white rounded border p-2 mb-0">{{ rejection.message }}</p>
+        </div>
+      </div>
+    {% endif %}
+  {% endwith %}
   <form>
     {% csrf_token %}
     <!-- Draft Mode Controls -->