Revert changes to hide the 'Manage Customers' button

Hiding the button broke formatting on the app list page and could
lead to confusion. Instead I have improved the messaging displayed
to users if they try to manage customers without either creating
an Auth0 client or enabling authentication.

controlpanel/api/models/app.py

@@ -10,10 +10,9 @@
 from django_extensions.db.models import TimeStampedModel
 
 # First-party/Local
-from controlpanel.api import auth0, cluster
+from controlpanel.api import auth0, cluster, tasks
 from controlpanel.api.models import IPAllowlist
 from controlpanel.utils import github_repository_name, s3_slugify, webapp_release_name
-from controlpanel.api import tasks
 
 
 class App(TimeStampedModel):
@@ -83,12 +82,6 @@ def release_name(self):
     def iam_role_arn(self):
         return cluster.iam_arn(f"role/{self.iam_role_name}")
 
-    @property
-    def can_manage_customers(self):
-        if not self.app_conf:
-            return False
-        return bool(self.app_conf.get(self.KEY_WORD_FOR_AUTH_SETTINGS))
-
     def get_group_id(self, env_name):
         return self.get_auth_client(env_name).get("group_id")
 
@@ -320,7 +313,8 @@ class DeleteCustomerError(Exception):
 App.DeleteCustomerError = DeleteCustomerError
 
 
-from django.db.models.signals import post_save, post_delete
+# Third-party
+from django.db.models.signals import post_delete, post_save
 from django.dispatch import receiver
 
 
@@ -342,6 +336,7 @@ def trigger_app_create_related_messages(sender, instance, created, **kwargs):
 
 @receiver(post_delete, sender=App)
 def remove_app_related_tasks(sender, instance, **kwargs):
+    # First-party/Local
     from controlpanel.api.models import Task
     related_app_tasks = Task.objects.filter(entity_class="App", entity_id=instance.id)
     for task in related_app_tasks:

controlpanel/frontend/jinja2/customers-list.html

@@ -20,7 +20,7 @@ <h2 class="govuk-heading-m">
 
 {% if not groups_dict %}
    <h2 class="govuk-heading-s">
-      No need to manage the customers of the app on Control panel as it does not require authentication
+      Customer management is disabled. To manage customers, create an Auth0 client and enable authentication on the <a href="{{ url("manage-app", kwargs={ "pk": app.id}) }}"> manage app page.</a>
    </h2>
 {% else %}
   <section>

controlpanel/frontend/jinja2/includes/app-list.html

@@ -36,12 +36,9 @@
       <td class="govuk-table__cell">
         {{ yes_no(user.is_app_admin(app.id)) }}
       </td>
-      {% if app.can_manage_customers %}
-        <td class="govuk-table__cell">
-          <a href="{{ url("appcustomers-page", kwargs={"pk": app.id, "page_no": "1"}) }}"
-            class="govuk-button govuk-button--secondary right" >Manage customers</a>
-        </td>
-      {% endif %}
+      <td class="govuk-table__cell">
+        <a href="{{ url("appcustomers-page", kwargs={"pk": app.id, "page_no": "1"}) }}" class="govuk-button govuk-button--secondary right">Manage customers</a>
+      </td>
       <td class="govuk-table__cell">
         <a class="govuk-button govuk-button--secondary right {%- if not request.user.has_perm('api.retrieve_app', app) %} govuk-visually-hidden{% endif %}"
           href="{{ url("manage-app", kwargs={ "pk": app.id}) }}">

tests/api/models/test_app.py

@@ -209,17 +209,3 @@ def test_app_allowed_ip_ranges():
 def test_iam_role_arn():
     app = App(slug="example-app")
     assert app.iam_role_arn == f"arn:aws:iam::{settings.AWS_DATA_ACCOUNT_ID}:role/test_app_example-app"
-
-
-@pytest.mark.parametrize("conf, expected", [
-    (None, False),
-    ({}, False),
-    ({"some_setting_key": []}, False),
-    ({App.KEY_WORD_FOR_AUTH_SETTINGS: None}, False),
-    ({App.KEY_WORD_FOR_AUTH_SETTINGS: {}}, False),
-    ({App.KEY_WORD_FOR_AUTH_SETTINGS: {"dev": {}}}, True),
-])
-def test_can_manage_customers(conf, expected):
-    app = App()
-    app.app_conf = conf
-    assert app.can_manage_customers is expected