wp_ajax_get_permalink

function wp_ajax_get_permalink() {
	check_ajax_referer( 'getpermalink', 'getpermalinknonce' );
	$post_id = isset( $_POST['post_id'] ) ? intval( $_POST['post_id'] ) : 0;
	wp_die( get_preview_post_link( $post_id ) );
}