mr-legend_wiki/inc/Action/Revert.php

<?php

namespace dokuwiki\Action;

use dokuwiki\Action\Exception\ActionAbort;
use dokuwiki\Action\Exception\ActionException;

/**
 * Class Revert
 *
 * Quick revert to an old revision
 *
 * @package dokuwiki\Action
 */
class Revert extends AbstractUserAction
{
    /** @inheritdoc */
    public function minimumPermission()
    {
        return AUTH_EDIT;
    }

    /**
     *
     * @inheritdoc
     * @throws ActionAbort
     * @throws ActionException
     * @todo check for writability of the current page ($INFO might do it wrong and check the attic version)
     */
    public function preProcess()
    {
        if (!checkSecurityToken()) throw new ActionException();

        global $ID;
        global $REV;
        global $lang;

        // when no revision is given, delete current one
        // FIXME this feature is not exposed in the GUI currently
        $text = '';
        $sum = $lang['deleted'];
        if ($REV) {
            $text = rawWiki($ID, $REV);
            if (!$text) throw new ActionException(); //something went wrong
            $sum = sprintf($lang['restored'], dformat($REV));
        }

        // spam check
        if (checkwordblock($text)) {
            msg($lang['wordblock'], -1);
            throw new ActionException('edit');
        }

        saveWikiText($ID, $text, $sum, false);
        msg($sum, 1);
        $REV = '';

        // continue with draftdel -> redirect -> show
        throw new ActionAbort('draftdel');
    }
}