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/usr/share/horde/ingo/lib/Script/Sieve/Action/Reject.php is in php-horde-ingo 3.2.8-1ubuntu1.

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<?php
/**
 * Copyright 2012-2016 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file LICENSE for license information (ASL).  If you
 * did not receive this file, see http://www.horde.org/licenses/apache.
 *
 * @author   Mike Cochrane <mike@graftonhall.co.nz>
 * @author   Jan Schneider <jan@horde.org>
 * @category Horde
 * @license  http://www.horde.org/licenses/apache ASL
 * @package  Ingo
 */

/**
 * The Ingo_Script_Sieve_Action_Reject class represents a reject action.
 *
 * @author   Mike Cochrane <mike@graftonhall.co.nz>
 * @author   Jan Schneider <jan@horde.org>
 * @category Horde
 * @license  http://www.horde.org/licenses/apache ASL
 * @package  Ingo
 */
class Ingo_Script_Sieve_Action_Reject extends Ingo_Script_Sieve_Action
{
    /**
     * Constructor.
     *
     * @param array $vars  Any required parameters.
     */
    public function __construct($vars = array())
    {
        $this->_vars['reason'] = isset($vars['reason'])
            ? $vars['reason']
            : '';
    }

    /**
     * Returns a script snippet representing this rule and any sub-rules.
     *
     * @return string  A Sieve script snippet.
     */
    public function generate()
    {
        return 'reject "' . Ingo_Script_Sieve::escapeString($this->_vars['reason']) . '";';
    }

    /**
     * Checks if the rule parameters are valid.
     *
     * @return boolean|string  True if this rule is valid, an error message
     *                         otherwise.
     */
    public function check()
    {
        return empty($this->_vars['reason'])
            ? _("Missing reason for reject")
            : true;
    }

    /**
     * Returns a list of sieve extensions required for this rule and any
     * sub-rules.
     *
     * @return array  A Sieve extension list.
     */
    public function requires()
    {
        return array('reject');
    }
}