mirror of
https://github.com/silverstripe/silverstripe-cms
synced 2024-06-26 14:39:27 +02:00
101 lines
2.9 KiB
PHP
101 lines
2.9 KiB
PHP
<?php
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class OldPageRedirector extends Extension {
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/**
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* On every URL that generates a 404, we'll capture it here and see if we can
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* find an old URL that it should be redirecting to.
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*
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* @param SS_HTTPRequest $request The request object
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* @throws SS_HTTPResponse_Exception
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*/
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public function onBeforeHTTPError404($request) {
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// We need to get the URL ourselves because $request->allParams() only has a max of 4 params
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$params = preg_split('|/+|', $request->getURL());
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$getvars = $request->getVars();
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unset($getvars['url']);
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$page = self::find_old_page($params);
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if ($page) {
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$res = new SS_HTTPResponse();
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$res->redirect(
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Controller::join_links(
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$page,
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($getvars) ? '?' . http_build_query($getvars) : null
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), 301);
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throw new SS_HTTPResponse_Exception($res);
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}
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}
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/**
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* Attempt to find an old/renamed page from some given the URL as an array
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*
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* @param array $params The array of URL, e.g. /foo/bar as array('foo', 'bar')
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* @param SiteTree $parent The current parent in the recursive flow
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* @param boolean $redirect Whether we've found an old page worthy of a redirect
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*
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* @return string|boolean False, or the new URL
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*/
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static public function find_old_page($params, $parent = null, $redirect = false) {
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$parent = is_numeric($parent) ? SiteTree::get()->byId($parent) : $parent;
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$params = (array)$params;
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$URL = rawurlencode(array_shift($params));
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if (empty($URL)) { return false; }
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if ($parent) {
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$page = SiteTree::get()->filter(array('ParentID' => $parent->ID, 'URLSegment' => $URL))->First();
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} else {
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$page = SiteTree::get()->filter(array('URLSegment' => $URL))->First();
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}
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if (!$page) {
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// If we haven't found a candidate, lets resort to finding an old page with this URL segment
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$oldFilter = array(
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'"SiteTree_versions"."URLSegment"' => $URL,
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'"SiteTree_versions"."WasPublished"' => true
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);
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if($parent) {
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$oldFilter[] = array('"SiteTree_versions"."ParentID"' => $parent->ID);
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}
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$query = new SQLSelect(
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'"RecordID"',
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'"SiteTree_versions"',
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$oldFilter,
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'"LastEdited" DESC',
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null,
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null,
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1
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);
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$record = $query->execute()->first();
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if ($record) {
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$page = SiteTree::get()->byID($record['RecordID']);
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$redirect = true;
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}
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}
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if ($page && $page->canView()) {
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if (count($params)) {
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// We have to go deeper!
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$ret = self::find_old_page($params, $page, $redirect);
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if ($ret) {
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// A valid child page was found! We can return it
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return $ret;
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} else {
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// No valid page found.
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if ($redirect) {
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// 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
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return $page->Link() . implode('/', $params);
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}
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}
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} else {
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// We've found the final, end all, page.
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return $page->Link();
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}
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}
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return false;
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}
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}
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