spring-soap/spring-5/src/main/java/com/baeldung/functional/FunctionalSpringBootApplication.java

package com.baeldung.functional;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;
import org.springframework.core.io.ClassPathResource;
import org.springframework.http.server.reactive.HttpHandler;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.web.reactive.function.server.RouterFunction;
import org.springframework.web.reactive.function.server.RouterFunctions;
import org.springframework.web.reactive.function.server.ServerResponse;
import org.springframework.web.server.WebHandler;
import org.springframework.web.server.adapter.WebHttpHandlerBuilder;
import reactor.core.publisher.Flux;

import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

import static org.springframework.web.reactive.function.BodyInserters.fromObject;
import static org.springframework.web.reactive.function.server.RequestPredicates.*;
import static org.springframework.web.reactive.function.server.RouterFunctions.route;
import static org.springframework.web.reactive.function.server.RouterFunctions.toHttpHandler;
import static org.springframework.web.reactive.function.server.ServerResponse.ok;

@SpringBootApplication
@ComponentScan(basePackages = { "com.baeldung.functional" })
public class FunctionalSpringBootApplication {

    private static final Actor BRAD_PITT = new Actor("Brad", "Pitt");
    private static final Actor TOM_HANKS = new Actor("Tom", "Hanks");
    private static final List<Actor> actors = new CopyOnWriteArrayList<>(Arrays.asList(BRAD_PITT, TOM_HANKS));

    private RouterFunction<ServerResponse> routingFunction() {
        FormHandler formHandler = new FormHandler();

        RouterFunction<ServerResponse> restfulRouter = route(GET("/"), serverRequest -> ok().body(Flux.fromIterable(actors), Actor.class)).andRoute(POST("/"), serverRequest -> serverRequest
          .bodyToMono(Actor.class)
          .doOnNext(actors::add)
          .then(ok().build()));

        return route(GET("/test"), serverRequest -> ok().body(fromObject("helloworld")))
          .andRoute(POST("/login"), formHandler::handleLogin)
          .andRoute(POST("/upload"), formHandler::handleUpload)
          .and(RouterFunctions.resources("/files/**", new ClassPathResource("files/")))
          .andNest(path("/actor"), restfulRouter)
          .filter((request, next) -> {
              System.out.println("Before handler invocation: " + request.path());
              return next.handle(request);
          });
    }

    @Bean
    public ServletRegistrationBean servletRegistrationBean() throws Exception {
        HttpHandler httpHandler = WebHttpHandlerBuilder
          .webHandler((WebHandler) toHttpHandler(routingFunction()))
          .prependFilter(new IndexRewriteFilter())
          .build();
        ServletRegistrationBean registrationBean = new ServletRegistrationBean<>(new RootServlet(httpHandler), "/");
        registrationBean.setLoadOnStartup(1);
        registrationBean.setAsyncSupported(true);
        return registrationBean;
    }

    @Configuration
    @EnableWebSecurity
    @Profile("!https")
    static class SecurityConfig extends WebSecurityConfigurerAdapter {
        @Override
        protected void configure(final HttpSecurity http) throws Exception {
            http
              .authorizeRequests()
              .anyRequest()
              .permitAll();
        }
    }

    public static void main(String[] args) {
        SpringApplication.run(FunctionalSpringBootApplication.class, args);
    }

}