Add a hook to allow other modules to alter the default grants for a piece of content [#1459970]

As a module developer I would like to be able to hook into the content_access modules logic for setting the default access grants for a node and set my own so that I can create different defaults for content of the same type.

For example, I have a need to have hierarchical inheritance of grants such that a node, be default, inherits the grants of another node (referenced in my case via a node reference field). The hook code in my own module would look like this:

/**
 * Implements hook_content_access_default_grant_alter().
 * If no per node grants exist for a seminar, load the grants 
 * for the parent event if it is set.
 */
function mymodule_content_access_default_grant_alter($node, &$grants) {
  if ($node->type == 'seminar' && empty($grants)) {
    if (isset($node->field_event_reference) && is_array($node->field_event_reference)) {
      $event = node_load($node->field_event_reference[0]['nid']);
      if (is_object($event)) {
        $grants = content_access_get_per_node_settings($event);
      }
    }
  }
}

Comment	File	Size	Author
#4	content_access-hook_to_alter_default_grants-1459970-4.patch	1.03 KB	johnennew
#3	content_access-hook_to_alter_default_grants-1459970-3.patch	1.03 KB	johnennew
#1	content_access-hook_to_alter_default_grants-1459970-1.patch	1.09 KB	johnennew

Comments

Comment #1

johnennew commented 28 February 2012 at 11:31

Status	File	Size
new	content_access-hook_to_alter_default_grants-1459970-1.patch	1.09 KB

The attached patch demonstrates a way of adding this hook to content_access_per_node_settings function.

Comment #2

johnennew commented 28 February 2012 at 11:31

Status:

Active

» Needs review

switched to needs_review

Comment #3

johnennew commented 28 February 2012 at 11:48

Status	File	Size
new	content_access-hook_to_alter_default_grants-1459970-3.patch	1.03 KB

Just remembered that there is a more elegant way to invoke an alter hook with drupal alter. Here is a new patch suggestion for comment and review.

The code in my own module would now look like this:

/**
 * Implements hook_content_access_default_grant_alter().
 * If no per node grants exist for a seminar, load the grants 
 * for the parent event if it is set.
 */
function mymodule_content_access_default_grant_alter(&$grants, $node) {
  if ($node->type == 'seminar' && empty($grants)) {
    if (isset($node->field_event_reference) && is_array($node->field_event_reference)) {
      $event = node_load($node->field_event_reference[0]['nid']);
      if (is_object($event)) {
        $grants = content_access_get_per_node_settings($event);
      }
    }
  }
}