SSO with OAuth2

application.yml

# https://github.com/settings/applications/427451
security:
    oauth2:
        client:
            clientId: dac36c509f4e899e2632
            clientSecret: 6c522884bbeda238d2a42506ac78354ca9cc4b4d
            accessTokenUri: https://github.com/login/oauth/access_token
            userAuthorizationUri: https://github.com/login/oauth/authorize
            clientAuthenticationScheme: form
        resource:
            userInfoUri: https://api.github.com/user
            preferTokenInfo: false
    basic:
      enabled: false

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>verydapeng</groupId>
	<artifactId>sec</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>sec</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.4.1.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-security</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.security.oauth</groupId>
			<artifactId>spring-security-oauth2</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

SsoApplication.java

package verydapeng;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.security.oauth2.client.EnableOAuth2Sso;
import org.springframework.context.annotation.Bean;
import org.springframework.security.oauth2.client.OAuth2ClientContext;
import org.springframework.security.oauth2.client.OAuth2RestTemplate;
import org.springframework.security.oauth2.client.resource.OAuth2ProtectedResourceDetails;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.security.Principal;

@SpringBootApplication
@EnableOAuth2Sso
@RestController
public class SecApplication {

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


    @Bean
    public OAuth2RestTemplate oauth2RestTemplate(OAuth2ClientContext oauth2ClientContext,
                                                 OAuth2ProtectedResourceDetails details) {
        return new OAuth2RestTemplate(details, oauth2ClientContext);
    }

    @Autowired
    OAuth2RestTemplate template;

    @GetMapping("/")
    Object hello(Principal p) {
        return p;
    }
}

http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-security-custom-user-info