use spring cloud gateway with oauth2

Question

i face a problem when i using spring cloud gateway

is if any dependency call spring-boot-starter-tomcat directly or recursively

it

Answer 1

spring boot 2.1 with spring security 5 have resolve this problem see this example

Answer 2

As you've seen, the Spring cloud gateway uses the reactive model and is based on netty rather than tomcat. The reactive change is a major shift and currently isn't supported by Spring Security but work is in progress on it and you can track it at https://github.com/spring-cloud/spring-cloud-gateway/issues/179

Answer 3

Use the following dependencies (I copied from my build.gradle)

dependencies {
    implementation 'org.springframework.cloud:spring-cloud-starter-gateway'
    implementation 'org.springframework.cloud:spring-cloud-starter-security'
    implementation 'org.springframework.boot:spring-boot-starter-oauth2-client'
}

Code your gateway app minimally as follows

@SpringBootApplication
public class App {

    @Bean
    public ForwardedHeaderTransformer forwardedHeaderTransformer() {
        return new ForwardedHeaderTransformer();
    }

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

Configure in application.yml

spring:
  security:
    oauth2:
      client:
        registration:
          google:
            client-id: XXX
            client-secret: YYY

I am actively building my stack that uses OAuth2 with Docker Swarm Discovery https://github.com/trajano/spring-cloud-demo.git so you can see how it would work in action.