Drupal 7 Module Development

Node Access
Once we have these permissions in place, we can simply enforce them inside
hook_node_grants(). We must add the permission logic to our foreach loop.
function role_access_node_grants($account, $op) {
// Get the user roles.
$roles = array_keys($account->roles);
}
// Error checking.
if (empty($roles)) {
return array();
}
// Initialize a $grants array.
$grants = array();
// Iterate through the roles.
foreach ($roles as $grant_id) {
// Check the permission callback!
if (user_access($op . ' role access content')) {
$grants['role_access'][] = $grant_id;
}
}
// Return the grants.
return $grants;
Now we have a mechanism for restricting the access rules based on the operation
being performed. Our recommended configuration looks like this:
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