import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Locale;

import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.model.RouteDefinition;

public class ProxyRoute extends RouteBuilder {

    @Override
    public void configure() throws Exception {
        final RouteDefinition from;
        if (Files.exists(keystorePath())) {
            from = from("netty4-http:proxy://0.0.0.0:8443?ssl=true&keyStoreFile=/tls/keystore.jks&passphrase=changeit&trustStoreFile=/tls/keystore.jks"); 
        } else {
            from = from("netty4-http:proxy://0.0.0.0:8080");
        }

        from
            .process(ProxyRoute::uppercase)
            .toD("netty4-http:"
                + "${headers." + Exchange.HTTP_SCHEME + "}://" 
                + "${headers." + Exchange.HTTP_HOST + "}:"
                + "${headers." + Exchange.HTTP_PORT + "}"
                + "${headers." + Exchange.HTTP_PATH + "}")
            .process(ProxyRoute::uppercase);
    }

    Path keystorePath() {
        return Path.of("/tls", "keystore.jks");
    }

    public static void uppercase(final Exchange exchange) { 
        final Message message = exchange.getIn();
        final String body = message.getBody(String.class);
        message.setBody(body.toUpperCase(Locale.US));
    }

}