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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\Core\JWT;
class JWS implements JWT
{
/**
* @var bool
*/
private $isPayloadDetached = false;
/**
* @var string|null
*/
private $encodedPayload = null;
/**
* @var Signature[]
*/
private $signatures = [];
/**
* @var string|null
*/
private $payload = null;
/**
* JWS constructor.
*/
private function __construct(?string $payload, ?string $encodedPayload = null, bool $isPayloadDetached = false)
{
$this->payload = $payload;
$this->encodedPayload = $encodedPayload;
$this->isPayloadDetached = $isPayloadDetached;
}
/**
* Creates a JWS object.
*
* @return JWS
*/
public static function create(?string $payload, ?string $encodedPayload = null, bool $isPayloadDetached = false): self
{
return new self($payload, $encodedPayload, $isPayloadDetached);
}
public function getPayload(): ?string
{
return $this->payload;
}
/**
* Returns true if the payload is detached.
*/
public function isPayloadDetached(): bool
{
return $this->isPayloadDetached;
}
/**
* Returns the Base64Url encoded payload.
* If the payload is detached, this method returns null.
*/
public function getEncodedPayload(): ?string
{
if (true === $this->isPayloadDetached()) {
return null;
}
return $this->encodedPayload;
}
/**
* Returns the signatures associated with the JWS.
*
* @return Signature[]
*/
public function getSignatures(): array
{
return $this->signatures;
}
/**
* Returns the signature at the given index.
*/
public function getSignature(int $id): Signature
{
if (isset($this->signatures[$id])) {
return $this->signatures[$id];
}
throw new \InvalidArgumentException('The signature does not exist.');
}
/**
* This method adds a signature to the JWS object.
* Its returns a new JWS object.
*
* @internal
*
* @return JWS
*/
public function addSignature(string $signature, array $protectedHeader, ?string $encodedProtectedHeader, array $header = []): self
{
$jws = clone $this;
$jws->signatures[] = Signature::create($signature, $protectedHeader, $encodedProtectedHeader, $header);
return $jws;
}
/**
* Returns the number of signature associated with the JWS.
*/
public function countSignatures(): int
{
return \count($this->signatures);
}
/**
* This method splits the JWS into a list of JWSs.
* It is only useful when the JWS contains more than one signature (JSON General Serialization).
*
* @return JWS[]
*/
public function split(): array
{
$result = [];
foreach ($this->signatures as $signature) {
$jws = self::create(
$this->payload,
$this->encodedPayload,
$this->isPayloadDetached
);
$jws = $jws->addSignature(
$signature->getSignature(),
$signature->getProtectedHeader(),
$signature->getEncodedProtectedHeader(),
$signature->getHeader()
);
$result[] = $jws;
}
return $result;
}
}
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