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<?php |
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namespace App\Services\Auth; |
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use Carbon\Carbon; |
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use App\Services\Auth\Contracts\JSONGetter; |
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use Illuminate\Contracts\Cache\Repository as CacheRepository; |
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use Lcobucci\JWT\Parsing\Decoder; |
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use Lcobucci\JWT\Signer\Key; |
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/** |
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* Adapted from the OpenIDConnect Laravel package at |
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* https://github.com/furdarius/oidconnect-laravel |
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*/ |
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class JwtKeysFetcher |
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{ |
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/** |
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* @var JSONGetter |
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*/ |
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private $fetcher; |
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/** |
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* @var string |
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*/ |
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private $jwksURI; |
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/** |
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* @var Decoder |
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*/ |
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private $decoder; |
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/** |
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* @var CacheRepository |
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*/ |
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private $cache; |
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/** |
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* @var int |
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*/ |
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private $cacheHourLimit; |
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/** |
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* JwtKeysFetcher constructor. |
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* |
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* @param JSONGetter $fetcher |
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* @param CacheRepository $cache |
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* @param Decoder $decoder |
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* @param string $jwksURI |
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* @param int $cacheHourLimit |
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*/ |
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public function __construct(JSONGetter $fetcher, CacheRepository $cache, Decoder $decoder, string $jwksURI, int $cacheHourLimit) |
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{ |
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$this->fetcher = $fetcher; |
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$this->cache = $cache; |
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$this->jwksURI = $jwksURI; |
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$this->decoder = $decoder; |
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$this->cacheHourLimit = $cacheHourLimit; |
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} |
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/** |
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* Fetch JWK key from JWKs URI with defined kid |
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* |
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* @param string $kid |
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* |
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* @return Key|null |
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*/ |
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public function getByKID(string $kid): Key |
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{ |
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$cacheKey = 'keys.' . $kid; |
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if ($this->cache->has($cacheKey)) { |
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return $this->cache->get($cacheKey); |
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} |
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/** @var Key[] $keys */ |
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$keys = $this->fetch(); |
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if (!isset($keys[$kid])) { |
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return null; |
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} |
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$this->cache->put($cacheKey, $keys[$kid], Carbon::now()->addHours($this->cacheHourLimit)); |
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return $keys[$kid]; |
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} |
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/** |
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* Fetch list of JWKs from JWKs URI |
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* |
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* @return array |
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*/ |
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public function fetch(): array |
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{ |
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$result = []; |
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$data = $this->fetcher->get($this->jwksURI); |
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foreach ($data['keys'] as $key) { |
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$result[$key['kid']] = new Key($this->createPemFromModulusAndExponent($key['n'], $key['e'])); |
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} |
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return $result; |
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} |
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/** |
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* |
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* Create a public key represented in PEM format from RSA modulus and exponent information |
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* |
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* @param string $n the RSA modulus encoded in URL Safe Base64 |
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* @param string $e the RSA exponent encoded in URL Safe Base64 |
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* |
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* @return string the RSA public key represented in PEM format |
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*/ |
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protected function createPemFromModulusAndExponent(string $n, string $e): string |
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{ |
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$modulus = $this->decoder->base64UrlDecode($n); |
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$publicExponent = $this->decoder->base64UrlDecode($e); |
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$components = [ |
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'modulus' => pack('Ca*a*', 2, $this->encodeLength(strlen($modulus)), $modulus), |
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'publicExponent' => pack('Ca*a*', 2, $this->encodeLength(strlen($publicExponent)), $publicExponent), |
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]; |
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$RSAPublicKey = pack( |
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'Ca*a*a*', |
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48, |
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$this->encodeLength(strlen($components['modulus']) + strlen($components['publicExponent'])), |
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$components['modulus'], |
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$components['publicExponent'] |
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); |
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$rsaOID = pack('H*', '300d06092a864886f70d0101010500'); |
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$RSAPublicKey = chr(0) . $RSAPublicKey; |
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$RSAPublicKey = chr(3) . $this->encodeLength(strlen($RSAPublicKey)) . $RSAPublicKey; |
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$RSAPublicKey = pack( |
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'Ca*a*', |
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48, |
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$this->encodeLength(strlen($rsaOID . $RSAPublicKey)), |
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$rsaOID . $RSAPublicKey |
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); |
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$RSAPublicKey = "-----BEGIN PUBLIC KEY-----" . PHP_EOL |
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. chunk_split(base64_encode($RSAPublicKey), 64, PHP_EOL) |
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. '-----END PUBLIC KEY-----'; |
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return $RSAPublicKey; |
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} |
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/** |
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* DER-encode the length |
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* |
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* DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4. See |
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* {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} |
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* for more information. |
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* |
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* @param int $length |
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* |
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* @return string |
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*/ |
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protected function encodeLength(int $length): string |
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{ |
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if ($length <= 0x7F) { |
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return chr($length); |
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} |
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$temp = ltrim(pack('N', $length), chr(0)); |
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return pack('Ca*', 0x80 | strlen($temp), $temp); |
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} |
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} |
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