#!/usr/bin/php
<?
/*
	DO NOT EDIT - This file is being maintained by Chef

	planet-mirror-redirect
	Check if planet file exists on mirror and link if not yet linked
	Modifies .htaccess
*/
$_YEAR = date('Y');
$_PLANET_FOLDER = '/store/planet/planet/'.$_YEAR.'/';
$_PLANET_REGEX = "/^(planet|changesets)\-\d{6}(\-nolt)?\.osm\.(bz2|gz)$/";
$_MIRROR = 'http://ftp.heanet.ie/mirrors/openstreetmap.org/planet/'.$_YEAR.'/';
$_PLANET_HTACCESS = $_PLANET_FOLDER.'../../.htaccess';

function _MIRROR_FILE_SIZE($url) {
	$ch = @curl_init();
	curl_setopt($ch, CURLOPT_URL, $url);
	curl_setopt($ch, CURLOPT_NOBODY, TRUE);
	curl_setopt($ch, CURLOPT_VERBOSE, FALSE);
	$curl_response = @curl_exec($ch);
	$curl_result = curl_getinfo($ch);
	if ($curl_result['http_code']!='200') return FALSE;
	return ($curl_result['download_content_length']);
}			

if (posix_getuid() !== fileowner($_PLANET_HTACCESS)) die('User ID of process does not match .htaccess owner'."\n");

if (is_dir($_PLANET_FOLDER)) {
	$htaccess_contents = file_get_contents($_PLANET_HTACCESS);
	$htaccess_handle = fopen($_PLANET_HTACCESS, 'a');
	if ($dh = opendir($_PLANET_FOLDER)) {
		while (($file = readdir($dh)) !== false ) {
			if (preg_match($_PLANET_REGEX,$file)) {
				$file_slashed = 'planet/'.$_YEAR.'/'.str_replace(array('.','-'), array('\.','\-'), $file);
				if (strpos($htaccess_contents,$file_slashed) === false) {
					//PHP IS BRAINDEAD filesize borked >4GB
					//$file_size = $file_stats['size'];
					$file_size = trim(`stat -c%s $_PLANET_FOLDER$file`);
					sleep(rand(2,5));
					$file_mirror_size = _MIRROR_FILE_SIZE($_MIRROR.$file);
					if ($file_size==$file_mirror_size) {
							echo 'Adding: '.$file."\n";
							fwrite($htaccess_handle,	'RewriteRule'."\t".
											'^('.$file_slashed.')$'."\t".
											'http://ftp.heanet.ie/mirrors/openstreetmap.org/$1'."\t".
											'[R,L]'."\n");
					}
				}
			}
		}
		closedir($dh);
		fclose($htaccess_handle);
	}
}
?>