/*
 * Copyright 2020-2024 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package sample.sociallogin;

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.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 {
		OAuth2AuthorizationServerConfigurer authorizationServerConfigurer =
				OAuth2AuthorizationServerConfigurer.authorizationServer();

		// @formatter:off
		http
			.securityMatcher(authorizationServerConfigurer.getEndpointsMatcher())
			.with(authorizationServerConfigurer, (authorizationServer) ->
				authorizationServer
					.oidc(Customizer.withDefaults())	// Enable OpenID Connect 1.0
			)
			// 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)
				)
			);
		// @formatter:on

		return http.build();
	}

	@Bean // <3>
	@Order(2)
	public SecurityFilterChain defaultSecurityFilterChain(HttpSecurity http)
			throws Exception {
		// @formatter:off
		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>
		// @formatter:on

		return http.build();
	}

}