/*
 * Copyright 2002-2019 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;

import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.AuthenticationManagerResolver;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.oauth2.jwt.JwtDecoder;
import org.springframework.security.oauth2.jwt.JwtProcessors;
import org.springframework.security.oauth2.jwt.NimbusJwtDecoder;
import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationProvider;
import org.springframework.security.oauth2.server.resource.authentication.OAuth2IntrospectionAuthenticationProvider;

/**
 * @author Josh Cummings
 */
@EnableWebSecurity
public class OAuth2ResourceServerSecurityConfiguration extends WebSecurityConfigurerAdapter {

	@Value("${spring.security.oauth2.resourceserver.jwt.jwk-set-uri}")
	String jwkSetUri;

	@Value("${spring.security.oauth2.resourceserver.opaque.introspection-uri}")
	String introspectionUri;

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		// @formatter:off
		http
			.authorizeRequests()
				.antMatchers("/**/message/**").hasAuthority("SCOPE_message:read")
				.anyRequest().authenticated()
				.and()
			.oauth2ResourceServer()
				.authenticationManagerResolver(multitenantAuthenticationManager());
		// @formatter:on
	}

	@Bean
	AuthenticationManagerResolver<HttpServletRequest> multitenantAuthenticationManager() {
		Map<String, AuthenticationManager> authenticationManagers = new HashMap<>();
		authenticationManagers.put("tenantOne", jwt());
		authenticationManagers.put("tenantTwo", opaque());
		return request -> {
			String tenantId = request.getPathInfo().split("/")[1];
			return Optional.ofNullable(authenticationManagers.get(tenantId))
					.orElseThrow(() -> new IllegalArgumentException("unknown tenant"));
		};
	}

	AuthenticationManager jwt() {
		JwtDecoder jwtDecoder = new NimbusJwtDecoder(JwtProcessors.withJwkSetUri(this.jwkSetUri).build());
		return new JwtAuthenticationProvider(jwtDecoder)::authenticate;
	}

	AuthenticationManager opaque() {
		return new OAuth2IntrospectionAuthenticationProvider(this.introspectionUri, "client", "secret")::authenticate;
	}
}