function node_access_view_all_nodes

Determines whether the user has a global viewing grant for all nodes.

Checks to see whether any module grants global 'view' access to a user account; global 'view' access is encoded in the {node_access} table as a grant with nid=0. If no node access modules are enabled, node.module defines such a global 'view' access grant.

This function is called when a node listing query is tagged with 'node_access'; when this function returns TRUE, no node access joins are added to the query.

Parameters

$account: (optional) The user object for the user whose access is being checked. If omitted, the current user is used. Defaults to NULL.

Return value

TRUE if 'view' access to all nodes is granted, FALSE otherwise.

See also

hook_node_grants()

node_query_node_access_alter()

Related topics

Node access rights
The node access system determines who can do what to which nodes.
2 calls to node_access_view_all_nodes()
hook_query_TAG_alter in drupal/core/modules/system/system.api.php
Perform alterations to a structured query for a given tag.
node_query_node_access_alter in drupal/core/modules/node/node.module
Implements hook_query_TAG_alter().
1 string reference to 'node_access_view_all_nodes'
NodeQueryAlterTest::testNodeQueryAlterOverride in drupal/core/modules/node/lib/Drupal/node/Tests/NodeQueryAlterTest.php
Tests 'node_access' query alter override.

File

drupal/core/modules/node/node.module, line 2685
The core module that allows content to be submitted to the site.

Code

function node_access_view_all_nodes($account = NULL) {
  global $user;
  if (!$account) {
    $account = $user;
  }

  // Statically cache results in an array keyed by $account->uid.
  $access =& drupal_static(__FUNCTION__);
  if (isset($access[$account->uid])) {
    return $access[$account->uid];
  }

  // If no modules implement the node access system, access is always TRUE.
  if (!module_implements('node_grants')) {
    $access[$account->uid] = TRUE;
  }
  else {
    $query = db_select('node_access');
    $query
      ->addExpression('COUNT(*)');
    $query
      ->condition('nid', 0)
      ->condition('grant_view', 1, '>=');
    $grants = db_or();
    foreach (node_access_grants('view', $account) as $realm => $gids) {
      foreach ($gids as $gid) {
        $grants
          ->condition(db_and()
          ->condition('gid', $gid)
          ->condition('realm', $realm));
      }
    }
    if (count($grants) > 0) {
      $query
        ->condition($grants);
    }
    $access[$account->uid] = $query
      ->execute()
      ->fetchField();
  }
  return $access[$account->uid];
}