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<?php
namespace StephenHill;
use InvalidArgumentException;
/**
* @package StephenHill\Base58
* @author Stephen Hill <stephen@gatekiller.co.uk>
* @copyright 2014 Stephen Hill <stephen@gatekiller.co.uk>
* @license http://www.opensource.org/licenses/MIT The MIT License
* @link https://github.com/stephen-hill/base58php
* @since Release v1.0.0
*/
class Base58
{
/**
* @var StephenHill\ServiceInterface;
* @since v1.1.0
*/
protected $service;
/**
* Constructor
*
* @param string $alphabet optional
* @param ServiceInterface $service optional
* @since v1.0.0
* @since v1.1.0 Added the optional $service argument.
*/
public function __construct(
$alphabet = null,
ServiceInterface $service = null
) {
// Handle null alphabet
if (is_null($alphabet) === true) {
$alphabet = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
}
// Type validation
if (is_string($alphabet) === false) {
throw new InvalidArgumentException('Argument $alphabet must be a string.');
}
// The alphabet must contain 58 characters
if (strlen($alphabet) !== 58) {
throw new InvalidArgumentException('Argument $alphabet must contain 58 characters.');
}
// Provide a default service if one isn't injected
if ($service === null) {
// Check for GMP support first
if (function_exists('\gmp_init') === true) {
$service = new GMPService($alphabet);
}
else if (function_exists('\bcmul') === true) {
$service = new BCMathService($alphabet);
}
else {
throw new \Exception('Please install the BC Math or GMP extension.');
}
}
$this->service = $service;
}
/**
* Encode a string into base58.
*
* @param string $string The string you wish to encode.
* @since v1.0.0
* @return string The Base58 encoded string.
*/
public function encode($string)
{
return $this->service->encode($string);
}
/**
* Decode base58 into a PHP string.
*
* @param string $base58 The base58 encoded string.
* @since v1.0.0
* @return string Returns the decoded string.
*/
public function decode($base58)
{
return $this->service->decode($base58);
}
}
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