118 lines
4.1 KiB
PHP
118 lines
4.1 KiB
PHP
<?php
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namespace SilverStripe\CMS\Controllers;
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use SilverStripe\CMS\Model\SiteTree;
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use SilverStripe\Control\Controller;
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use SilverStripe\Control\Director;
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use SilverStripe\Control\HTTPRequest;
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use SilverStripe\Control\HTTPResponse;
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use SilverStripe\Control\HTTPResponse_Exception;
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use SilverStripe\Core\Extension;
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class OldPageRedirector extends Extension
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{
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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 HTTPRequest $request The request object
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* @throws HTTPResponse_Exception
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*/
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public function onBeforeHTTPError404($request)
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{
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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('|/+|', $request->getURL() ?? '');
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$cleanURL = trim(Director::makeRelative($request->getURL(false)) ?? '', '/');
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$getvars = $request->getVars();
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unset($getvars['url']);
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$page = self::find_old_page($params, 0);
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if (!$page) {
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$page = self::find_old_page($params);
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}
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$cleanPage = trim(Director::makeRelative($page) ?? '', '/');
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if (!$cleanPage) {
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$cleanPage = Director::makeRelative(RootURLController::get_homepage_link());
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}
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if ($page && $cleanPage != $cleanURL) {
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$res = new 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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),
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301
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);
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throw new 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 ['foo', 'bar']
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* @param SiteTree|null $parent The current parent in the recursive flow
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* @param boolean $redirect Whether we've found an old page worthy of a redirect
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*
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* @return string|boolean False, or the new URL
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*/
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public static function find_old_page($params, $parent = null, $redirect = false)
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{
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$parent = is_numeric($parent) && $parent > 0 ? SiteTree::get()->byID($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)) {
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return false;
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}
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$pages = SiteTree::get()->filter([
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'URLSegment' => $URL,
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]);
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if ($parent || is_numeric($parent)) {
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$pages = $pages->filter([
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'ParentID' => is_numeric($parent) ? $parent : $parent->ID,
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]);
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}
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/** @var SiteTree $page */
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$page = $pages->first();
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if (!$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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$pages = $pages
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->filter('WasPublished', 1)
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->sort('LastEdited', 'DESC')
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->setDataQueryParam("Versioned.mode", 'all_versions');
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$record = $pages->first();
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if ($record) {
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$page = SiteTree::get()->byID($record->ID);
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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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