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.
$account: The user object for the user whose access is being checked. If omitted, the current user is used.
TRUE if 'view' access to all nodes is granted, FALSE otherwise.
_node_query_node_access_alter()
function node_access_view_all_nodes($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];
}