Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/user/src/PermissionHandlerInterface.php

@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\user\PermissionHandlerInterface.
+ */
+
+namespace Drupal\user;
+
+/**
+ * Defines an interface to list available permissions.
+ */
+interface PermissionHandlerInterface {
+
+  /**
+   * Gets all available permissions.
+   *
+   * @return array
+   *   An array whose keys are permission names and whose corresponding values
+   *   are arrays containing the following key-value pairs:
+   *   - title: The human-readable name of the permission, to be shown on the
+   *     permission administration page. This should be wrapped in the t()
+   *     function so it can be translated.
+   *   - description: (optional) A description of what the permission does. This
+   *     should be wrapped in the t() function so it can be translated.
+   *   - restrict access: (optional) A boolean which can be set to TRUE to
+   *     indicate that site administrators should restrict access to this
+   *     permission to trusted users. This should be used for permissions that
+   *     have inherent security risks across a variety of potential use cases
+   *     (for example, the "administer filters" and "bypass node access"
+   *     permissions provided by Drupal core). When set to TRUE, a standard
+   *     warning message defined in user_admin_permissions() will be displayed
+   *     with the permission on the permission administration page. Defaults
+   *     to FALSE.
+   *   - warning: (optional) A translated warning message to display for this
+   *     permission on the permission administration page. This warning
+   *     overrides the automatic warning generated by 'restrict access' being
+   *     set to TRUE. This should rarely be used, since it is important for all
+   *     permissions to have a clear, consistent security warning that is the
+   *     same across the site. Use the 'description' key instead to provide any
+   *     information that is specific to the permission you are defining.
+   *   - provider: (optional) The provider name of the permission.
+   */
+  public function getPermissions();
+
+  /**
+   * Determines whether a module provides some permissions.
+   *
+   * @param string $module_name
+   *   The module name.
+   *
+   * @return bool
+   *   Returns TRUE if the module provides some permissions, otherwise FALSE.
+   */
+  public function moduleProvidesPermissions($module_name);
+
+}
+