<?php
// {{{ICINGA_LICENSE_HEADER}}}
// {{{ICINGA_LICENSE_HEADER}}}

namespace Icinga\Web\Form\Validator;

use Zend_Validate_Abstract;

/**
 * Validator that interprets the value as a filepath and checks if it's readable
 *
 * This validator should be preferred due to Zend_Validate_File_Exists is
 * getting confused if there is another element in the form called `name'.
 */
class ReadablePathValidator extends Zend_Validate_Abstract
{
    /**
     * The messages to write on different error states
     *
     * @var array
     *
     * @see Zend_Validate_Abstract::$_messageTemplates‚
     */
    protected $_messageTemplates;

    /**
     * Initialize this validator
     */
    public function __construct()
    {
        $this->_messageTemplates = array(
            'NOT_READABLE'      => t('Path is not readable'),
            'DOES_NOT_EXIST'    => t('Path does not exist')
        );
    }

    /**
     * Check whether the given value is a readable filepath
     *
     * @param   string  $value      The value submitted in the form
     * @param   mixed   $context    The context of the form
     *
     * @return  bool                Whether the value was successfully validated
     */
    public function isValid($value, $context = null)
    {
        if (false === file_exists($value)) {
            $this->_error('DOES_NOT_EXIST');
            return false;
        }

        if (false === is_readable($value)) {
            $this->_error('NOT_READABLE');
        }

        return true;
    }
}