<?php

error_reporting(0);

function error($msg = '') {
	header('HTTP/1.1 500 Internal Server Error');
	exit($msg);
}

if (empty($_GET['engine']))
	error('Param engine is empty');
	
if (!in_array($_GET['engine'], array('yandex', 'google')))
	error('Unknown engine: ' . $_GET['engine']);

$r4_logfile = $_SERVER['DOCUMENT_ROOT'] . '/rzgn/seenby' . $_GET['engine'] . '.rzg';

if (!file_exists($r4_logfile))
	error('File not found: ' . $r4_logfile);

$action = array_intersect(array('get', 'delete'), 
	explode(',', 
		(empty($_GET['action']) ? 'get' : $_GET['action'])
	)
);

if (in_array('get', $action))
	echo file_get_contents($r4_logfile);

if (in_array('delete', $action))
	unlink($r4_logfile);