페이스북 개발자 앱 등록

https://growth-coder.tistory.com/141

1. 라이브러리 등록

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-oauth2-client</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-security</artifactId>
		</dependency>

2.application.yml  설정

spring:
  security:
   oauth2:
     client:
      registration:
       facebook:
        client-id: 
        client-secret: 
        scope:
        - public_profile
        - email

3. SecurityConfig  설정

	
@RequiredArgsConstructor
@EnableWebSecurity
@Configuration 
public class SecurityConfig extends WebSecurityConfigurerAdapter {

         pivate final OAuth2DetailsService oAuth2DetailsService;


	@Override
	protected void configure(HttpSecurity http) throws Exception {	

http.

~

            .and()
		.oauth2Login() 
		.userInfoEndpoint()
		.userService(oAuth2DetailsService); 


}

4. OAuth2DetailsService

import java.util.Map;
import java.util.UUID;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.oauth2.client.userinfo.DefaultOAuth2UserService;
import org.springframework.security.oauth2.client.userinfo.OAuth2UserRequest;
import org.springframework.security.oauth2.core.OAuth2AuthenticationException;
import org.springframework.security.oauth2.core.user.OAuth2User;
import org.springframework.stereotype.Service;

import com.cos.photogramstart.config.auth.PrincipalDetails;
import com.cos.photogramstart.domain.user.User;
import com.cos.photogramstart.domain.user.UserRepository;

@Service
public class OAuth2DetailsService  extends DefaultOAuth2UserService{

	@Autowired
	private UserRepository userRepository;
	
	
	@Override
	public OAuth2User loadUser(OAuth2UserRequest userRequest) throws OAuth2AuthenticationException {

		System.out.println(" OAuth 2 페이스북 로그인  " +userRequest.getAccessToken());
		OAuth2User oauth2User=super.loadUser(userRequest);
		
		Map<String,Object> userInfo= oauth2User.getAttributes();
		String username="facebook_"+(String)userInfo.get("id");	
		String password= new BCryptPasswordEncoder().encode(UUID.randomUUID().toString());
		String name=(String)userInfo.get("name");
		String email=(String)userInfo.get("email");

		System.out.println("************ oAuth2User.getAttributes   : "  + oauth2User.getAttributes());
		System.out.println("************ username  : "  + username);
		System.out.println("************ password  : "  + password);
		System.out.println("************ name  : "  + name);
		System.out.println("************ email  : "  + email);
		
		User userEntity=userRepository.findByUsername(username);
		
		if(userEntity==null) {
			User user =User.builder()
					.username(username)
					.password(password)
					.email(email)
					.name(name)
					.role("ROLE_USER")
					.build();
			
			return new PrincipalDetails(userRepository.save(user), oauth2User.getAttributes());		
		}else {
			//페이스북으로 이미 회원가입이 되어 있는경우
			return new PrincipalDetails(userEntity, oauth2User.getAttributes());
		}
				
	}

	
}

5. login.jsp

    <!-- Oauth 소셜로그인 -->
                        <div class="login__facebook">
                            <button onclick="javascript:location.href='/oauth2/authorization/facebook'">
                                <i class="fab fa-facebook-square"></i>
                                <span>Facebook으로 로그인</span>
                            </button>
                        </div>
                        <!-- Oauth 소셜로그인end -->

PrincipalDetails

import java.util.ArrayList;
import java.util.Collection;
import java.util.Map;

import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.oauth2.core.user.OAuth2User;

import com.cos.photogramstart.domain.user.User;

public class PrincipalDetails implements UserDetails , OAuth2User{

	private static final long serialVersionUID = 3351489579645764340L;

	private User user;
	
	private Map<String, Object> attributes;
	
	
	public PrincipalDetails(User user) {
		this.user=user;		
	}
	
	public PrincipalDetails(User user, Map<String, Object> attributes) {
		this.attributes=attributes;
		this.user=user;		
	}
	
		
	public User getUser() {
		return user;
	}
	
	public void setUser(User user) {
		this.user = user;
	}
	
	//권한:한개가 아닐 수 있음.(3개 이상의 권한)
	@Override
	public Collection<? extends GrantedAuthority> getAuthorities() {			
		Collection<GrantedAuthority> collector=new ArrayList<>();	
//		collector.add(new GrantedAuthority() {
//			
//			@Override
//			public String getAuthority() {
//				return user.getRole();
//			}
//		});
		collector.add(()-> user.getRole());		
		return collector;
	}
	
	
	@Override
	public String getPassword() {
		return user.getPassword();
	}

	@Override
	public String getUsername() {
		return user.getUsername();
	}

	
	@Override
	public boolean isAccountNonExpired() {
		return true;
	}

	@Override
	public boolean isAccountNonLocked() {
		return true;
	}

	@Override
	public boolean isCredentialsNonExpired() {		
		return true;
	}

	@Override
	public boolean isEnabled() {
		return true;
	}


	@Override
	public Map<String, Object> getAttributes() {
		return attributes;
	}


	@Override
	public String getName() {
		return (String)attributes.get("name");
	}

	
	
	
}

소스 :

 https://github.com/braverokmc79/spring-boot-jpa-web-release