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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 AlexLisenkov\LaravelWebPush\Contracts\P256EncryptedMessageBuilderContract; |
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use AlexLisenkov\LaravelWebPush\Contracts\PushMessageContract; |
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use AlexLisenkov\LaravelWebPush\Contracts\PushSubscriptionContract; |
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use AlexLisenkov\LaravelWebPush\Contracts\WebPushContract; |
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use AlexLisenkov\LaravelWebPush\Exceptions\InvalidPrivateKeyException; |
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use AlexLisenkov\LaravelWebPush\Exceptions\InvalidPublicKeyException; |
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use AlexLisenkov\LaravelWebPush\Exceptions\MessageSerializationException; |
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use Base64Url\Base64Url; |
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use GuzzleHttp\Client; |
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use GuzzleHttp\Promise\PromiseInterface; |
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use GuzzleHttp\Psr7\Request; |
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use Illuminate\Contracts\Config\Repository as ConfigRepository; |
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class WebPush implements WebPushContract |
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{ |
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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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/** |
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* @var P256EncryptedMessageBuilderContract |
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*/ |
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private $encrypted_message_builder; |
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/** |
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* @var JWTGeneratorContract |
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*/ |
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private $JWT_generator; |
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/** |
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* @var Client |
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*/ |
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private $client; |
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/** |
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* WebPush constructor. |
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* |
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* @param ConfigRepository $config_repository |
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* @param P256EncryptedMessageBuilderContract $encrypted_message_builder |
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* @param JWTGeneratorContract $JWT_generator |
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* @param Client $client |
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*/ |
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public function __construct( |
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ConfigRepository $config_repository, |
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P256EncryptedMessageBuilderContract $encrypted_message_builder, |
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JWTGeneratorContract $JWT_generator, |
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Client $client |
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) { |
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$this->config_repository = $config_repository; |
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$this->encrypted_message_builder = $encrypted_message_builder; |
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$this->JWT_generator = $JWT_generator; |
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$this->client = $client; |
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} |
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/** |
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* @param PushMessageContract $message |
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* @param PushSubscriptionContract $push_subscription |
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* |
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* @return PromiseInterface |
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* @throws MessageSerializationException |
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*/ |
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public function sendMessage( |
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PushMessageContract $message, |
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PushSubscriptionContract $push_subscription |
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): PromiseInterface { |
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$this->assertConfiguredKeysAreCorrect(); |
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if (!$this->assertPublicKeyIsCorrect($push_subscription->getP256dh())) { |
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throw new InvalidPublicKeyException('Subscriber public key is invalid'); |
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} |
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$payload = $message->toJson(); |
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if ($payload === false) { |
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throw new MessageSerializationException(get_class($message)); |
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} |
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$encryptedMessage = $this->encrypted_message_builder |
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->withPublicKey($push_subscription->getP256dh()) |
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->withAuthToken($push_subscription->getAuth()) |
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->build($payload); |
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$jwt = $this->JWT_generator |
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->withAudience($push_subscription->getAudience()) |
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->serialize(); |
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$headers = [ |
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'Content-Type' => 'application/octet-stream', |
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'Content-Encoding' => 'aesgcm', |
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'Authorization' => 'WebPush ' . $jwt, |
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'Encryption' => 'salt=' . $encryptedMessage->getEncodedSalt(), |
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'Crypto-Key' => 'dh=' . $encryptedMessage->getEncodedPublicKey() . ';p256ecdsa=' . $this->getConfigVariable('public_key'), |
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'Content-Length' => 'dh=' . $encryptedMessage->getCypherLength(), |
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'TTL' => $this->getConfigVariable('TTL', Constants::DEFAULT_TTL), |
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]; |
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if ($topic = $message->getTopic()) { |
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$headers['Topic'] = $topic; |
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} |
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if ($urgency = $message->getUrgency()) { |
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$headers['Urgency'] = $urgency; |
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} |
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$request = new Request('POST', $push_subscription->getEndpoint(), $headers, $encryptedMessage->getCypher()); |
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return $this->client->sendAsync($request); |
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} |
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private function assertConfiguredKeysAreCorrect(): void |
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{ |
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$private = $this->getConfigVariable('private_key'); |
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if (!$this->assertPrivateKeyIsCorrect($private)) { |
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throw new InvalidPrivateKeyException('Configured private key is incorrect'); |
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} |
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$public = $this->getConfigVariable('public_key'); |
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if (!$this->assertPublicKeyIsCorrect($public)) { |
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throw new InvalidPublicKeyException('Configured public key is incorrect'); |
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} |
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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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* Assert that the given private key is correct by size |
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* |
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* @param $private |
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* |
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* @return bool |
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*/ |
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private function assertPrivateKeyIsCorrect($private): bool |
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{ |
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try { |
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$private_key_decoded = Base64Url::decode($private); |
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} catch (\InvalidArgumentException $exception) { |
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return false; |
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} |
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return mb_strlen($private_key_decoded, '8bit') === 32; |
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} |
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/** |
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* Assert that the given public key is correct by size |
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* |
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* @param $public |
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* |
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* @return bool |
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*/ |
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private function assertPublicKeyIsCorrect($public): bool |
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{ |
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try { |
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$public_key_decoded = Base64Url::decode($public); |
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} catch (\InvalidArgumentException $exception) { |
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return false; |
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} |
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return mb_strlen($public_key_decoded, '8bit') === 65; |
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} |
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} |
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AlexLisenkov /
laravel-web-push
