KeyLength.php

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<?php
namespace Magento\Integration\Model\Oauth\Consumer\Validator;

class KeyLength extends \Zend_Validate_StringLength
{
    protected $_name = 'Key';

    protected $_messageTemplates = [
        self::INVALID   => "Invalid type given for %name%. String expected",
        self::TOO_SHORT => "%name% '%value%' is less than %min% characters long",
        self::TOO_LONG  => "%name% '%value%' is more than %max% characters long",
    ];

    protected $_messageVariables = ['min' => '_min', 'max' => '_max', 'name' => '_name'];

    public function __construct($options = [])
    {
        if (!is_array($options)) {
            $options = func_get_args();
            if (!isset($options[1])) {
                $options[1] = 'utf-8';
            }
            parent::__construct($options[0], $options[0], $options[1]);
            return;
        } else {
            if (isset($options['length'])) {
                $options['max'] = $options['min'] = $options['length'];
            }
            if (isset($options['name'])) {
                $this->_name = $options['name'];
            }
        }
        parent::__construct($options);
    }

    public function setLength($length)
    {
        parent::setMax($length);
        parent::setMin($length);
        return $this;
    }

    public function getLength()
    {
        return parent::getMin();
    }

    public function isValid($value)
    {
        $result = parent::isValid($value);
        if (!$result && isset($this->_messages[self::INVALID])) {
            throw new \Exception($this->_messages[self::INVALID]);
        }
        return $result;
    }

    public function setName($name)
    {
        $this->_name = $name;
        return $this;
    }

    public function getName()
    {
        return $this->_name;
    }
}