gnu-social/plugins/Favorite/actions/favor.php

<?php
/**
 * Favor action.
 *
 * PHP version 5
 *
 * @category Action
 * @package  GNUsocial
 * @author   Evan Prodromou <evan@status.net>
 * @author   Robin Millette <millette@status.net>
 * @author   Mikael Nordfeldth <mmn@hethane.se>
 * @license  http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
 * @link     http://www.gnu.org/software/social/
 *
 * StatusNet - the distributed open-source microblogging tool
 * Copyright (C) 2008, 2009, StatusNet, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

if (!defined('GNUSOCIAL')) { exit(1); }

/**
 * FavorAction class.
 *
 * @category Action
 * @package  GNUsocial
 * @author   Evan Prodromou <evan@status.net>
 * @author   Robin Millette <millette@status.net>
 * @author   Mikael Nordfeldth <mmn@hethane.se>
 * @license  http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
 * @link     http://www.gnu.org/software/social/
 */
class FavorAction extends FormAction
{
    protected $needPost = true;

    protected function doPreparation()
    {
        $this->target = Notice::getKV($this->trimmed('notice'));
        if (!$this->target instanceof Notice) {
            throw new ServerException(_m('No such notice.'));
        }
        if (!$this->target->inScope($this->scoped)) {
            // TRANS: Client error displayed when trying to interact with a notice a the target has no access to.
            // TRANS: %1$s is a user nickname, %2$d is a notice ID (number).
            throw new ClientException(sprintf(_m('%1$s has no right to interact with notice %2$d.'), $this->scoped->getNickname(), $this->target->getID()), 403);
        }
    }

    protected function doPost()
    {
        if (Fave::existsForProfile($this->target, $this->scoped)) {
            // TRANS: Client error displayed when trying to mark a notice as favorite that already is a favorite.
            throw new AlreadyFulfilledException(_('You have already favorited this!'));
        }

        // throws exception on failure
        $stored = Fave::addNew($this->scoped, $this->target);

        // TRANS: Message when a favor action has been taken for a notice.
        return _('Favorited the notice');
    }

    protected function showContent()
    {
        $disfavor = new DisfavorForm($this, $this->target);
        $disfavor->show();
    }
}