Add a new group level permission that allows to delete the group.

src/EventSubscriber/OgEventSubscriber.php

@@ -91,6 +91,12 @@ public function provideDefaultOgPermissions(PermissionEventInterface $event) {
         'description' => $this->t('Edit the group entity.'),
         'default roles' => [OgRoleInterface::ADMINISTRATOR],
       ]),
+      new GroupPermission([
+        'name' => OgAccess::DELETE_GROUP_PERMISSION,
+        'title' => $this->t('Delete group'),
+        'description' => $this->t('Delete the group.'),
+        'default roles' => [OgRoleInterface::ADMINISTRATOR],
+      ]),
       new GroupPermission([
         'name' => OgAccess::ADMINISTER_GROUP_PERMISSION,
         'title' => $this->t('Administer group'),

src/OgAccess.php

@@ -29,6 +29,11 @@ class OgAccess implements OgAccessInterface {
    */
   const ADMINISTER_GROUP_PERMISSION = 'administer group';
 
+  /**
+   * Group level permission that allows the user to delete the group entity.
+   */
+  const DELETE_GROUP_PERMISSION = 'delete group';
+
   /**
    * Group level permission that allows the user to update the group entity.
    */
@@ -38,6 +43,7 @@ class OgAccess implements OgAccessInterface {
    * Maps entity operations performed on groups to group level permissions.
    */
   const OPERATION_GROUP_PERMISSION_MAPPING = [
+    'delete' => self::DELETE_GROUP_PERMISSION,
     'update' => self::UPDATE_GROUP_PERMISSION,
   ];