silverstripe-cms/code/controllers/OldPageRedirector.php
2015-09-29 17:18:03 +13:00

101 lines
2.9 KiB
PHP

<?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_HTTPRequest $request The request object
* @throws SS_HTTPResponse_Exception
*/
public function onBeforeHTTPError404($request) {
// We need to get the URL ourselves because $request->allParams() only has a max of 4 params
$params = preg_split('|/+|', $request->getURL());
$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) {
$parent = is_numeric($parent) ? SiteTree::get()->byId($parent) : $parent;
$params = (array)$params;
$URL = rawurlencode(array_shift($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
$oldFilter = array(
'"SiteTree_versions"."URLSegment"' => $URL,
'"SiteTree_versions"."WasPublished"' => true
);
if($parent) {
$oldFilter[] = array('"SiteTree_versions"."ParentID"' => $parent->ID);
}
$query = new SQLSelect(
'"RecordID"',
'"SiteTree_versions"',
$oldFilter,
'"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;
}
}