/**
* Constructor
*
* @param JWKParameter ...$params
* @throws \UnexpectedValueException If missing required parameter
*/
public function __construct(JWKParameter ...$params)
{
parent::__construct(...$params);
foreach (self::MANAGED_PARAMS as $name) {
if (!$this->has($name)) {
throw new \UnexpectedValueException("Missing '{$name}' parameter.");
}
}
if ($this->keyTypeParameter()->value() != KeyTypeParameter::TYPE_OCT) {
throw new \UnexpectedValueException("Invalid key type.");
}
}
/**
* Initialize from an array representing a JSON object.
*
* @param array $members
* @throws \UnexpectedValueException
* @return self
*/
public static function fromArray(array $members)
{
if (!isset($members["keys"]) || !is_array($members["keys"])) {
throw new \UnexpectedValueException("JWK Set must have a 'keys' member.");
}
$jwks = array_map(function ($jwkdata) {
return JWK::fromArray($jwkdata);
}, $members["keys"]);
unset($members["keys"]);
$obj = new self(...$jwks);
$obj->_additional = $members;
return $obj;
}
/**
* Derive algorithm name from the header and optionally from the given JWK.
*
* @param Header $header Header
* @param JWK $jwk Optional JWK
* @throws \UnexpectedValueException If algorithm parameter is not present
* or header and JWK algorithms differ.
* @return string Algorithm name
*/
public static function deriveAlgorithmName(Header $header, JWK $jwk = null)
{
if ($header->hasAlgorithm()) {
$alg = $header->algorithm()->value();
}
// if JWK is set, and has an algorithm parameter
if (isset($jwk) && $jwk->hasAlgorithmParameter()) {
$jwk_alg = $jwk->algorithmParameter()->value();
// check that algorithms match
if (isset($alg) && $alg != $jwk_alg) {
throw new \UnexpectedValueException("JWK algorithm '{$jwk_alg}' doesn't match" . " the header's algorithm '{$alg}'.");
}
$alg = $jwk_alg;
}
if (!isset($alg)) {
throw new \UnexpectedValueException("No algorithm parameter.");
}
return $alg;
}
/**
* Get value as a JWK.
*
* @return JWK
*/
public function jwk()
{
return JWK::fromArray($this->_value);
}