core: add UserIsRootMixin and an admin delete view for memberships

core/templates/core/user_clubs.jinja

@@ -28,6 +28,9 @@
             {% if m.can_be_edited_by(user) %}
             <td><a href="{{ url('club:membership_set_old', membership_id=m.id) }}">{% trans %}Mark as old{% endtrans %}</a></td>
             {% endif %}
+            {% if user.is_root %}
+                <td><a href="{{ url('club:membership_delete', membership_id=m.id) }}">{% trans %}Delete{% endtrans %}</a></td>
+            {% endif %}
         </tr>
     	{% endfor %}
     </tbody>
@@ -54,6 +57,9 @@
             <td>{{ m.description }}</td>
             <td>{{ m.start_date }}</td>
             <td>{{ m.end_date }}</td>
+            {% if user.is_root %}
+                <td><a href="{{ url('club:membership_delete', membership_id=m.id) }}">{% trans %}Delete{% endtrans %}</a></td>
+            {% endif %}
         </tr>
     	{% endfor %}
     </tbody>

core/views/__init__.py

@@ -242,6 +242,16 @@ class CanViewMixin(GenericContentPermissionMixinBuilder):
     permission_function = can_view
 
 
+class UserIsRootMixin(GenericContentPermissionMixinBuilder):
+    """
+    This view check if the user is root
+
+    :raises: PermissionDenied
+    """
+
+    permission_function = lambda obj, user: user.is_root
+
+
 class FormerSubscriberMixin(View):
     """
     This view check if the user was at least an old subscriber