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<?php |
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namespace AlexLisenkov\LaravelWebPush; |
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use AlexLisenkov\LaravelWebPush\Contracts\JWTGeneratorContract; |
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use Base64Url\Base64Url; |
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use Exception; |
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use Illuminate\Contracts\Config\Repository as ConfigRepository; |
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use InvalidArgumentException; |
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use Jose\Component\Core\AlgorithmManager; |
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use Jose\Component\Core\JWK; |
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use Jose\Component\Signature\Algorithm\ES256; |
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use Jose\Component\Signature\JWS; |
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use Jose\Component\Signature\JWSBuilder; |
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use Jose\Component\Signature\Serializer\CompactSerializer; |
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class JWTGenerator implements JWTGeneratorContract |
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{ |
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/** |
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* @var int |
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*/ |
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private $expires_at; |
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/** |
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* @var string |
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*/ |
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private $audience; |
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/** |
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* @var ConfigRepository |
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*/ |
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private $config_repository; |
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public function __construct(ConfigRepository $config_repository) |
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{ |
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$this->config_repository = $config_repository; |
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} |
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/** |
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* @param string $aud |
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* |
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* @return JWTGeneratorContract |
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*/ |
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public function withAudience(string $aud): JWTGeneratorContract |
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{ |
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$this->audience = $aud; |
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return $this; |
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} |
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/** |
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* @param int $time |
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* |
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* @return JWTGeneratorContract |
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*/ |
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public function willExpireAt(int $time): JWTGeneratorContract |
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{ |
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$this->expires_at = $time; |
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return $this; |
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} |
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/** |
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* @return string |
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* @throws Exception |
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*/ |
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public function serialize(): string |
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{ |
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$jwsCompactSerializer = new CompactSerializer(); |
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return $jwsCompactSerializer->serialize($this->getJWS(), 0); |
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} |
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/** |
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* @return JWS |
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* @throws Exception |
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*/ |
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public function getJWS(): JWS |
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{ |
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$jwsBuilder = new JWSBuilder(new AlgorithmManager([new ES256()])); |
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return $jwsBuilder |
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->create() |
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->withPayload($this->getPayload()) |
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->addSignature($this->getJWK(), $this->getHeader()) |
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->build(); |
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} |
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/** |
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* @return string |
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* @throws InvalidArgumentException |
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* @throws Exception |
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*/ |
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public function getPayload(): string |
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{ |
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if (!$this->audience) { |
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throw new Exception('No audience set'); |
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} |
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if (!$this->getExpiresAt()) { |
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$this->willExpireIn($this->getConfigVariable('expiration', Constants::DEFAULT_EXPIRE)); |
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} |
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return json_encode([ |
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'aud' => $this->audience, |
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'exp' => $this->getExpiresAt(), |
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'sub' => $this->getConfigVariable('subject', env('APP_URL', 'mailto:[email protected]')), |
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], JSON_UNESCAPED_SLASHES | JSON_NUMERIC_CHECK); |
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} |
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/** |
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* Get ExpiresAt |
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* |
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* @return int|null |
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*/ |
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public function getExpiresAt(): ?int |
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{ |
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return $this->expires_at; |
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} |
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/** |
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* @param int $time |
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* |
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* @return JWTGeneratorContract |
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*/ |
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public function willExpireIn(int $time): JWTGeneratorContract |
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{ |
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$this->expires_at = time() + $time; |
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return $this; |
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} |
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/** |
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* @param string $key |
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* |
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* @param $default |
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* |
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* @return mixed |
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*/ |
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private function getConfigVariable(string $key, $default = null) |
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{ |
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return $this->config_repository->get(Constants::CONFIG_KEY . '.' . $key, $default); |
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} |
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/** |
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* @return JWK |
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*/ |
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public function getJWK(): JWK |
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{ |
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$local_server_key = Base64Url::decode($this->getConfigVariable('public_key')); |
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$public = $this->unserializePublicKey($local_server_key); |
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return new JWK([ |
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'kty' => 'EC', |
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'crv' => 'P-256', |
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'x' => Base64Url::encode($public['x']), |
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'y' => Base64Url::encode($public['y']), |
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'd' => $this->getConfigVariable('private_key'), |
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]); |
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} |
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/** |
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* @param string $data |
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* |
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* @return array |
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*/ |
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private function unserializePublicKey(string $data): array |
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{ |
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$data = bin2hex($data); |
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$first_byte = mb_substr($data, 0, 2, '8bit'); |
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if ($first_byte !== '04') { |
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throw new InvalidArgumentException('Invalid data: only uncompressed keys are supported.'); |
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} |
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$data = mb_substr($data, 2, null, '8bit'); |
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$center = mb_strlen($data) / 2; |
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return [ |
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'x' => hex2bin(mb_substr($data, 0, $center, '8bit')), |
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'y' => hex2bin(mb_substr($data, $center, null, '8bit')), |
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]; |
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} |
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/** |
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* @return array |
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*/ |
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4 |
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public function getHeader(): array |
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{ |
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return [ |
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'typ' => 'JWT', |
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'alg' => 'ES256', |
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]; |
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} |
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} |
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AlexLisenkov /
laravel-web-push
