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<?php
declare(strict_types=1);
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2018 Spomky-Labs
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file for details.
*/
namespace Jose\Component\Signature;
use Jose\Component\Checker\HeaderCheckerManager;
use Jose\Component\Core\JWK;
use Jose\Component\Core\JWKSet;
use Jose\Component\Signature\Serializer\JWSSerializerManager;
class JWSLoader
{
/**
* @var JWSVerifier
*/
private $jwsVerifier;
/**
* @var HeaderCheckerManager|null
*/
private $headerCheckerManager;
/**
* @var JWSSerializerManager
*/
private $serializerManager;
/**
* JWSLoader constructor.
*/
public function __construct(JWSSerializerManager $serializerManager, JWSVerifier $jwsVerifier, ?HeaderCheckerManager $headerCheckerManager)
{
$this->serializerManager = $serializerManager;
$this->jwsVerifier = $jwsVerifier;
$this->headerCheckerManager = $headerCheckerManager;
}
/**
* Returns the JWSVerifier associated to the JWSLoader.
*/
public function getJwsVerifier(): JWSVerifier
{
return $this->jwsVerifier;
}
/**
* Returns the Header Checker Manager associated to the JWSLoader.
*/
public function getHeaderCheckerManager(): ?HeaderCheckerManager
{
return $this->headerCheckerManager;
}
/**
* Returns the JWSSerializer associated to the JWSLoader.
*/
public function getSerializerManager(): JWSSerializerManager
{
return $this->serializerManager;
}
/**
* This method will try to load and verify the token using the given key.
* It returns a JWS and will populate the $signature variable in case of success, otherwise an exception is thrown.
*
* @throws \Exception
*/
public function loadAndVerifyWithKey(string $token, JWK $key, ?int &$signature, ?string $payload = null): JWS
{
$keyset = new JWKSet([$key]);
return $this->loadAndVerifyWithKeySet($token, $keyset, $signature, $payload);
}
/**
* This method will try to load and verify the token using the given key set.
* It returns a JWS and will populate the $signature variable in case of success, otherwise an exception is thrown.
*
* @throws \Exception
*/
public function loadAndVerifyWithKeySet(string $token, JWKSet $keyset, ?int &$signature, ?string $payload = null): JWS
{
try {
$jws = $this->serializerManager->unserialize($token);
$nbSignatures = $jws->countSignatures();
for ($i = 0; $i < $nbSignatures; ++$i) {
if ($this->processSignature($jws, $keyset, $i, $payload)) {
$signature = $i;
return $jws;
}
}
} catch (\Exception $e) {
// Nothing to do. Exception thrown just after
}
throw new \Exception('Unable to load and verify the token.');
}
private function processSignature(JWS $jws, JWKSet $keyset, int $signature, ?string $payload): bool
{
try {
if (null !== $this->headerCheckerManager) {
$this->headerCheckerManager->check($jws, $signature);
}
return $this->jwsVerifier->verifyWithKeySet($jws, $keyset, $signature, $payload);
} catch (\Exception $e) {
return false;
}
}
}
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