使い方: ソーシャルログインを使用した認証

okta:
  base-url: ${OKTA_BASE_URL}

spring:
  security:
    oauth2:
      client:
        registration:
          my-client:
            provider: okta
            client-id: ${OKTA_CLIENT_ID}
            client-secret: ${OKTA_CLIENT_SECRET}
            scope:
              - openid
              - profile
              - email
        provider:
          okta:
            authorization-uri: ${okta.base-url}/oauth2/v1/authorize
            token-uri: ${okta.base-url}/oauth2/v1/token
            user-info-uri: ${okta.base-url}/oauth2/v1/userinfo
            jwk-set-uri: ${okta.base-url}/oauth2/v1/keys
            user-name-attribute: sub

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.http.MediaType;
import org.springframework.security.config.Customizer;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.oauth2.server.authorization.config.annotation.web.configuration.OAuth2AuthorizationServerConfiguration;
import org.springframework.security.oauth2.server.authorization.config.annotation.web.configurers.OAuth2AuthorizationServerConfigurer;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.LoginUrlAuthenticationEntryPoint;
import org.springframework.security.web.util.matcher.MediaTypeRequestMatcher;

@Configuration
@EnableWebSecurity
public class SecurityConfig {

	@Bean (1)
	@Order(1)
	public SecurityFilterChain authorizationServerSecurityFilterChain(HttpSecurity http)
			throws Exception {
		OAuth2AuthorizationServerConfiguration.applyDefaultSecurity(http);
		http.getConfigurer(OAuth2AuthorizationServerConfigurer.class)
			.oidc(Customizer.withDefaults());	// Enable OpenID Connect 1.0
		http
			// Redirect to the OAuth 2.0 Login endpoint when not authenticated
			// from the authorization endpoint
			.exceptionHandling((exceptions) -> exceptions
				.defaultAuthenticationEntryPointFor( (2)
					new LoginUrlAuthenticationEntryPoint("/oauth2/authorization/my-client"),
					new MediaTypeRequestMatcher(MediaType.TEXT_HTML)
				)
			)
			// Accept access tokens for User Info and/or Client Registration
			.oauth2ResourceServer((oauth2) -> oauth2.jwt(Customizer.withDefaults()));

		return http.build();
	}

	@Bean (3)
	@Order(2)
	public SecurityFilterChain defaultSecurityFilterChain(HttpSecurity http)
			throws Exception {
		http
			.authorizeHttpRequests((authorize) -> authorize
				.anyRequest().authenticated()
			)
			// OAuth2 Login handles the redirect to the OAuth 2.0 Login endpoint
			// from the authorization server filter chain
			.oauth2Login(Customizer.withDefaults()); (4)

		return http.build();
	}

}

import java.io.IOException;
import java.util.function.Consumer;

import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import org.springframework.security.core.Authentication;
import org.springframework.security.oauth2.client.authentication.OAuth2AuthenticationToken;
import org.springframework.security.oauth2.core.oidc.user.OidcUser;
import org.springframework.security.oauth2.core.user.OAuth2User;
import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
import org.springframework.security.web.authentication.SavedRequestAwareAuthenticationSuccessHandler;
public final class FederatedIdentityAuthenticationSuccessHandler implements AuthenticationSuccessHandler {

	private final AuthenticationSuccessHandler delegate = new SavedRequestAwareAuthenticationSuccessHandler();

	private Consumer<OAuth2User> oauth2UserHandler = (user) -> {};

	private Consumer<OidcUser> oidcUserHandler = (user) -> this.oauth2UserHandler.accept(user);

	@Override
	public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
		if (authentication instanceof OAuth2AuthenticationToken) {
			if (authentication.getPrincipal() instanceof OidcUser) {
				this.oidcUserHandler.accept((OidcUser) authentication.getPrincipal());
			} else if (authentication.getPrincipal() instanceof OAuth2User) {
				this.oauth2UserHandler.accept((OAuth2User) authentication.getPrincipal());
			}
		}

		this.delegate.onAuthenticationSuccess(request, response, authentication);
	}

	public void setOAuth2UserHandler(Consumer<OAuth2User> oauth2UserHandler) {
		this.oauth2UserHandler = oauth2UserHandler;
	}

	public void setOidcUserHandler(Consumer<OidcUser> oidcUserHandler) {
		this.oidcUserHandler = oidcUserHandler;
	}

}

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Consumer;

import org.springframework.security.oauth2.core.user.OAuth2User;
public final class UserRepositoryOAuth2UserHandler implements Consumer<OAuth2User> {

	private final UserRepository userRepository = new UserRepository();

	@Override
	public void accept(OAuth2User user) {
		// Capture user in a local data store on first authentication
		if (this.userRepository.findByName(user.getName()) == null) {
			System.out.println("Saving first-time user: name=" + user.getName() + ", claims=" + user.getAttributes() + ", authorities=" + user.getAuthorities());
			this.userRepository.save(user);
		}
	}

	static class UserRepository {

		private final Map<String, OAuth2User> userCache = new ConcurrentHashMap<>();

		public OAuth2User findByName(String name) {
			return this.userCache.get(name);
		}

		public void save(OAuth2User oauth2User) {
			this.userCache.put(oauth2User.getName(), oauth2User);
		}

	}

}

import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.springframework.security.core.Authentication;
import org.springframework.security.oauth2.core.oidc.IdTokenClaimNames;
import org.springframework.security.oauth2.core.oidc.OidcIdToken;
import org.springframework.security.oauth2.core.oidc.endpoint.OidcParameterNames;
import org.springframework.security.oauth2.core.oidc.user.OidcUser;
import org.springframework.security.oauth2.core.user.OAuth2User;
import org.springframework.security.oauth2.server.authorization.token.JwtEncodingContext;
import org.springframework.security.oauth2.server.authorization.token.OAuth2TokenCustomizer;
public final class FederatedIdentityIdTokenCustomizer implements OAuth2TokenCustomizer<JwtEncodingContext> {

	private static final Set<String> ID_TOKEN_CLAIMS = Collections.unmodifiableSet(new HashSet<>(Arrays.asList(
			IdTokenClaimNames.ISS,
			IdTokenClaimNames.SUB,
			IdTokenClaimNames.AUD,
			IdTokenClaimNames.EXP,
			IdTokenClaimNames.IAT,
			IdTokenClaimNames.AUTH_TIME,
			IdTokenClaimNames.NONCE,
			IdTokenClaimNames.ACR,
			IdTokenClaimNames.AMR,
			IdTokenClaimNames.AZP,
			IdTokenClaimNames.AT_HASH,
			IdTokenClaimNames.C_HASH
	)));

	@Override
	public void customize(JwtEncodingContext context) {
		if (OidcParameterNames.ID_TOKEN.equals(context.getTokenType().getValue())) {
			Map<String, Object> thirdPartyClaims = extractClaims(context.getPrincipal());
			context.getClaims().claims(existingClaims -> {
				// Remove conflicting claims set by this authorization server
				existingClaims.keySet().forEach(thirdPartyClaims::remove);

				// Remove standard id_token claims that could cause problems with clients
				ID_TOKEN_CLAIMS.forEach(thirdPartyClaims::remove);

				// Add all other claims directly to id_token
				existingClaims.putAll(thirdPartyClaims);
			});
		}
	}

	private Map<String, Object> extractClaims(Authentication principal) {
		Map<String, Object> claims;
		if (principal.getPrincipal() instanceof OidcUser) {
			OidcUser oidcUser = (OidcUser) principal.getPrincipal();
			OidcIdToken idToken = oidcUser.getIdToken();
			claims = idToken.getClaims();
		} else if (principal.getPrincipal() instanceof OAuth2User) {
			OAuth2User oauth2User = (OAuth2User) principal.getPrincipal();
			claims = oauth2User.getAttributes();
		} else {
			claims = Collections.emptyMap();
		}

		return new HashMap<>(claims);
	}

}

@Bean
public OAuth2TokenCustomizer<JwtEncodingContext> idTokenCustomizer() {
    return new FederatedIdentityIdTokenCustomizer();
}