Proposition

gistfile1.txt

<?php

namespace Lexik\Bundle\JWTAuthenticationBundle\Exception;

/**
 * Base class for exceptions thrown during JWTEncoderInterface::encode().
 *
 * @author Robin Chalas <robin.chalas@gmail.com>
 */
class JWTEncodeFailureException extends JWTFailureException
{
    const INVALID_KEY  = 'invalid_key';
    const UNSIGNED_JWS = 'unsigned_jws';
}

JWTDecodeFailureException.php

<?php

namespace Lexik\Bundle\JWTAuthenticationBundle\Exception;

/**
 * Base class for exceptions thrown during JWTEncoderInterface::decode().
 *
 * @author Robin Chalas <robin.chalas@gmail.com>
 */
class JWTDecodeFailureException extends JWTFailureException
{
    const INVALID_JWT    = 'invalid_jwt';
    const UNVERIFIED_JWS = 'unverified_jws';
    const EXPIRED_JWT    = 'expired_jwt';
}

JWTFailureException.php

<?php

namespace Lexik\Bundle\JWTAuthenticationBundle\Exception;

/**
 * Base class for exceptions thrown during JWT creation/loading.
 *
 * @author Robin Chalas <robin.chalas@gmail.com>
 */
class JWTFailureException extends \Exception
{
    /**
     * @var string
     */
    private $reason;
    
    /**
     * @param string          $message
     * @param string          $reason
     * @param \Exception|null $previous
     */
    public function __construct($message, $reason, \Exception $previous = null)
    {
        parent::__construct($message, 0, $previous);
    }
    
    /**
     * @return string
     */
    public function getReason()
    {
        return $this->reason;
    }
}