Valid access arguments

Question

How can I look up the valid access arguments? I looked in menu_router, but I believe that only gives some of them.

$items['admin/page'] = array(
   'access arguments' => array('access administration pages'),
  );

score 2 · Answer 1 · answered Oct 25 '11 at 14:44

2

Invoke hook_permission() across all modules:

$permissions = module_invoke_all('permission');

If I remember rightly array_keys($permissions) will then give you a list of valid permission machine names. The labels/descriptions/other settings for each permissions are in each individual array item.

answered Oct 25 '11 at 14:44

Clive

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Is there somewhere I can look in the database? – Chris Muench Oct 25 '11 at 15:10
Good question I've never actually looked before! They don't seem to be stored en masse in the db, rather associations between roles and permissions are stored in `role_permission`. My guess is that the permissions admin page calls `module_invoke_all('permission')` every time it's run and rebuilds the `role_permission` table on save. That way all of the permissions never need to be stored and Drupal can infer that a role without a permission entry in the table *doesn't* have access to the page/resource – Clive Oct 25 '11 at 15:17
This actually kind of makes sense thinking about it, if all the permissions were stored then Drupal would have to de-duplicate between the list it held in the database and all those provided by modules (which may have changed since the db was last updated) – Clive Oct 25 '11 at 15:19

apaderno · Answer 2 · 2016-04-25T09:34:16.137

Actually, you are interested to the values of the access arguments where the access callback is "user_access" (the default value); as a module can use a different access callback, the values for the access arguments can theoretically be infinite.

The alternative to invoking all the implementations of hook_permission() is to use code similar to the following one:

$permissions = array();
db_query("SELECT permission FROM {role_permission}");

foreach ($result as $row) {
  $permissions[$row->permission] = TRUE;
}

array_keys($permissions) will then give you the list of all the permissions.

I took the query from user_role_permissions(); the difference is that the function is interested in the permissions associated to the role passed as argument.

score 0 · Answer 3 · answered Dec 07 '16 at 23:00

1- Check a list of valid permissions at: /admin/people/permissions

2- Specify the permission in your menu hook:

function webforms_advanced_router_menu() {

  $items['admin/config/mymodule'] = [
    'title' => 'MyModule',
    'page callback' => 'drupal_get_form',
    'access callback' => '_mymodule_admin_form',
    'access arguments' => array('administer site configuration'),
    'type' => MENU_CALLBACK
  ];

  return $items;
}

Valid access arguments

3 Answers3

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