<?php
/*
 * Apache configuration:
 *
 * <Directory /www/rpm/public/pld/dists/th>
 * # PLD Th -> PLD Th Archives
 * ErrorDocument 404 /html/th-archive.php
 * </Directory>
 */

// avoid magic slashes "escaping" redirect url
$request_uri = get_magic_quotes_gpc() ? stripslashes($_SERVER['REQUEST_URI']) : $_SERVER['REQUEST_URI'];

// remove full host portion if host is called as proxy.
$request_uri = preg_replace('#^http://'. quotemeta($_SERVER['SERVER_NAME']). '\b#', '', $request_uri);

function redirect($uri, $extra_msg = null) {
	global $request_uri;

	if (!preg_match('#^http://#', $uri)) {
		$uri = "http://{$_SERVER['SERVER_NAME']}$uri";
	}

	Header('HTTP/1.0 301 Content Moved');
	Header("Content-Location: $uri");
	Header("Location: $uri");
	error_log("archive redirect: $uri");
	die("Content moved to $uri.");
}

$errormap = array(
	# /home/services/ftp/pld/dists/th/PLD/i686/RPMS/php-pcre-5.3.5-4.i686.rpm
	'#^//?dists/th/PLD/([^/]+)/RPMS/(.+\.rpm)$#' => 'http://ftp1.pld-linux.org/dists/th/.archive/PLD/$1/RPMS/$2',
);

// build destination url from $errormap
$uri = preg_replace(array_keys($errormap), array_values($errormap), $request_uri, 1);

if ($uri != $request_uri) {
    redirect($uri);
}

.