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<?php
namespace League\Glide\Signatures;
class Signature implements SignatureInterface
{
/**
* Secret key used to generate signature.
*
* @var string
*/
protected $signKey;
/**
* Create Signature instance.
*
* @param string $signKey Secret key used to generate signature.
*/
public function __construct($signKey)
{
$this->signKey = $signKey;
}
/**
* Add an HTTP signature to manipulation parameters.
*
* @param string $path The resource path.
* @param array $params The manipulation parameters.
*
* @return array The updated manipulation parameters.
*/
public function addSignature($path, array $params)
{
return array_merge($params, ['s' => $this->generateSignature($path, $params)]);
}
/**
* Validate a request signature.
*
* @param string $path The resource path.
* @param array $params The manipulation params.
*
* @throws SignatureException
*/
public function validateRequest($path, array $params)
{
if (!isset($params['s'])) {
throw new SignatureException('Signature is missing.');
}
if ($params['s'] !== $this->generateSignature($path, $params)) {
throw new SignatureException('Signature is not valid.');
}
}
/**
* Generate an HTTP signature.
*
* @param string $path The resource path.
* @param array $params The manipulation parameters.
*
* @return string The generated HTTP signature.
*/
public function generateSignature($path, array $params)
{
unset($params['s']);
ksort($params);
return md5($this->signKey.':'.ltrim($path, '/').'?'.http_build_query($params));
}
}
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