silverstripe-cms/code/controllers/OldPageRedirector.php

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<?php
class OldPageRedirector extends Extension {
/**
* On every URL that generates a 404, we'll capture it here and see if we can
* find an old URL that it should be redirecting to.
*
* @param SS_HTTPResponse $request The request object
*/
public function onBeforeHTTPError404($request) {
// Build up the request parameters
$params = array_filter(array_values($request->allParams()), function($v) { return ($v !== NULL); });
$getvars = $request->getVars();
unset($getvars['url']);
$page = self::find_old_page($params);
if ($page) {
$res = new SS_HTTPResponse();
$res->redirect(
Controller::join_links(
$page,
($getvars) ? '?' . http_build_query($getvars) : null
), 301);
throw new SS_HTTPResponse_Exception($res);
}
}
/**
* Attempt to find an old/renamed page from some given the URL as an array
*
* @param array $params The array of URL, e.g. /foo/bar as array('foo', 'bar')
* @param SiteTree $parent The current parent in the recursive flow
* @param boolean $redirect Whether we've found an old page worthy of a redirect
*
* @return string|boolean False, or the new URL
*/
static public function find_old_page($params, $parent = null, $redirect = false) {
$URL = Convert::raw2sql(array_shift($params));
if (empty($URL)) { return false; }
if ($parent) {
$page = SiteTree::get()->filter(array('ParentID' => $parent->ID, 'URLSegment' => $URL))->First();
} else {
$page = SiteTree::get()->filter(array('URLSegment' => $URL))->First();
}
if (!$page) {
// If we haven't found a candidate, lets resort to finding an old page with this URL segment
// TODO: Rewrite using ORM syntax
$query = new SQLQuery (
'"RecordID"',
'"SiteTree_versions"',
"\"URLSegment\" = '$URL' AND \"WasPublished\" = 1" . ($parent ? ' AND "ParentID" = ' . $parent->ID : ''),
'"LastEdited" DESC',
null,
null,
1
);
$record = $query->execute()->first();
if ($record) {
$page = SiteTree::get()->byID($record['RecordID']);
$redirect = true;
}
}
if ($page && $page->canView()) {
if (count($params)) {
// We have to go deeper!
$ret = self::find_old_page($params, $page, $redirect);
if ($ret) {
// A valid child page was found! We can return it
return $ret;
} else {
// No valid page found.
if ($redirect) {
// If we had some redirect to be done, lets do it. imagine /foo/action -> /bar/action, we still want this redirect to happen if action isn't a page
return $page->Link() . implode('/', $params);
}
}
} else {
// We've found the final, end all, page.
return $page->Link();
}
}
return false;
}
}