This project was forked from enqueue/sns and made the following improvements:

• Move all classes to src
• Rename Tests to tests
• Move examples to tests
• Change namespace to Brighte\Sns

SnsProducer->send():

public function send(Destination $destination, Message $message): void
    {
        InvalidDestinationException::assertDestinationInstanceOf($destination, SnsDestination::class);
        InvalidMessageException::assertMessageInstanceOf($message, SnsMessage::class);

        $body = $message->getBody();
        if (empty($body)) {
            throw new InvalidMessageException('The message body must be a non-empty string.');
        }

        $topicArn = $this->context->getTopicArn($destination);

        $arguments = [
            'Message' => $message->getBody(),
            'TopicArn' => $topicArn,
        ];

        if ($message->getProperties()) {
            foreach ($message->getProperties() as $name => $value) {
                $arguments['MessageAttributes'][$name] = ['DataType' => 'String', 'StringValue' => $value];
            }
        }

        if ($message->getMessageAttributes()) {
            foreach ($message->getMessageAttributes() as $name => $value) {
                $arguments['MessageAttributes'][$name] = ['DataType' => 'String', 'StringValue' => $value];
            }
        }

        if (null !== ($structure = $message->getMessageStructure())) {
            $arguments['MessageStructure'] = $structure;
        }
        if (null !== ($phone = $message->getPhoneNumber())) {
            $arguments['PhoneNumber'] = $phone;
        }
        if (null !== ($subject = $message->getSubject())) {
            $arguments['Subject'] = $subject;
        }
        if (null !== ($targetArn = $message->getTargetArn())) {
            $arguments['TargetArn'] = $targetArn;
        }

        $result = $this->context->getSnsClient()->publish($arguments);

        if (false == $result->hasKey('MessageId')) {
            throw new \RuntimeException('Message was not sent');
        }

        $message->setSnsMessageId((string) $result->get('MessageId'));
    }