January « 2009 « FVN Tech Blog

20Jan/097

A Wordpress broken link helper

Just an example.
For wordpress ppl who changed their perm link.

<?php
require_once( dirname(__FILE__) . '/wp-load.php' );
global $wpdb;
$uri = $_SERVER["REQUEST_URI"];
$pattern = "/^\/(\d{4})\/(\d{2})\/(\d{2})\/([^\d].*|\d+[.^-]*).html$/";
if (preg_match($pattern, $uri, $match) == 1)
{
$year = $match[1];
$month = $match[2];
$mday = $match[3];
$post_name = $match[4];
if ((string)(int)$post_name == $post_name) {
$id = (int)$post_name;
$link = get_permalink($id);
if ($link)
wp_redirect($link, '301'); // Permanent redirect
}
$query = "SELECT post_id FROM $wpdb->postmeta, $wpdb->posts WHERE ID=post_id ".
"AND YEAR(post_date) = $year AND MONTH(post_date) = $month AND DAYOFMONTH(post_date) = $mday ".
"AND post_name = \"$post_name\" LIMIT 1";
$id = (int)$wpdb->get_var($query);
$link = get_permalink($id);
if ($link) wp_redirect($link, '301'); // Permanent redirect
$query = "SELECT ID FROM $wpdb->posts WHERE ".
"YEAR(post_date) = $year AND MONTH(post_date) = $month AND DAYOFMONTH(post_date) = $mday ".
"AND post_name = \"$post_name\" LIMIT 1";
$id = (int)$wpdb->get_var($query);
$link = get_permalink($id);
if ($link) wp_redirect($link, '301'); // Permanent redirect
$link = "/$year/$month/$mday/";
if (strstr($_SERVER["HTTP_USER_AGENT"], "Mozilla") === FALSE) // if it's not a user
{
wp_redirect($link, '302');
}
?>
<html><head>
<meta http-equiv="refresh" content="5;url=<?php echo $link;?>" / > <title>Page has moved</title> </head>
<body><p>The permant link changes, however <i>broken link helper</i> can't solve it automaticlly, it will redirect you to <a href="<?php echo $link;?>">the date archive page</a>. It would be nice if you can report broken links to feuvan#feuvan.net.</p>
</body></html>
<?php } ?>

Corresponding nginx configuration block:

server {
listen 80;
server_name blog.feuvan.net;

root /home/feuvan/wwwdata/blog;
index index.php;
if (-e $request_filename) {
break;
}

rewrite ^/index.php/(.+)$ /index.php?q=$1 last;
rewrite "^/([0-9]{4})/([0-9]{2})/([0-9]{2})/([^\d].*|\d+[.^-]*).html" /brokenlinkhelper.php last;
#rewrite ^/(.+)$ /index.php?q=$1 last;
rewrite ^/ /index.php last;

location ~ \.php$ {
fastcgi_pass unix:/tmp/php.sock;
}
}