/*
 * Copyright 2004-present 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 org.springframework.security.config.annotation.web.configurers;

import java.util.Optional;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.test.SpringTestContext;
import org.springframework.security.config.test.SpringTestContextExtension;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.PasswordEncodedUser;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

/**
 * Tests to verify that all the functionality of &lt;anonymous&gt; attributes is present
 *
 * @author Rob Winch
 * @author Josh Cummings
 *
 */
@ExtendWith(SpringTestContextExtension.class)
public class NamespaceHttpAnonymousTests {

	@Autowired
	MockMvc mvc;

	public final SpringTestContext spring = new SpringTestContext(this);

	@Test
	public void anonymousRequestWhenUsingDefaultAnonymousConfigurationThenUsesAnonymousAuthentication()
			throws Exception {
		this.spring.register(AnonymousConfig.class, AnonymousController.class).autowire();
		this.mvc.perform(get("/type")).andExpect(content().string(AnonymousAuthenticationToken.class.getSimpleName()));
	}

	@Test
	public void anonymousRequestWhenDisablingAnonymousThenDenies() throws Exception {
		this.spring.register(AnonymousDisabledConfig.class, AnonymousController.class).autowire();
		this.mvc.perform(get("/type")).andExpect(status().isForbidden());
	}

	@Test
	public void requestWhenAnonymousThenSendsAnonymousConfiguredAuthorities() throws Exception {
		this.spring.register(AnonymousGrantedAuthorityConfig.class, AnonymousController.class).autowire();
		this.mvc.perform(get("/type")).andExpect(content().string(AnonymousAuthenticationToken.class.getSimpleName()));
	}

	@Test
	public void anonymousRequestWhenAnonymousKeyConfiguredThenKeyIsUsed() throws Exception {
		this.spring.register(AnonymousKeyConfig.class, AnonymousController.class).autowire();
		this.mvc.perform(get("/key")).andExpect(content().string(String.valueOf("AnonymousKeyConfig".hashCode())));
	}

	@Test
	public void anonymousRequestWhenAnonymousUsernameConfiguredThenUsernameIsUsed() throws Exception {
		this.spring.register(AnonymousUsernameConfig.class, AnonymousController.class).autowire();
		this.mvc.perform(get("/principal")).andExpect(content().string("AnonymousUsernameConfig"));
	}

	@Configuration
	@EnableWebSecurity
	@EnableWebMvc
	static class AnonymousConfig {

		@Bean
		SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
			// @formatter:off
			http
				.authorizeHttpRequests((requests) -> requests
					.requestMatchers("/type").anonymous()
					.anyRequest().denyAll());
			return http.build();
			// @formatter:on
		}

	}

	@Configuration
	@EnableWebSecurity
	static class AnonymousDisabledConfig {

		@Bean
		SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
			// @formatter:off
			http
				.authorizeHttpRequests((requests) -> requests.anyRequest().anonymous())
				.anonymous((anonymous) -> anonymous.disable());
			// @formatter:on
			return http.build();
		}

		@Bean
		UserDetailsService userDetailsService() {
			return new InMemoryUserDetailsManager(PasswordEncodedUser.user(), PasswordEncodedUser.admin());
		}

	}

	@Configuration
	@EnableWebSecurity
	@EnableWebMvc
	static class AnonymousGrantedAuthorityConfig {

		@Bean
		SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
			// @formatter:off
			http
				.authorizeHttpRequests((requests) -> requests
					.requestMatchers("/type").hasRole("ANON")
					.anyRequest().denyAll())
				.anonymous((anonymous) -> anonymous
					.authorities("ROLE_ANON"));
			return http.build();
			// @formatter:on
		}

	}

	@Configuration
	@EnableWebSecurity
	@EnableWebMvc
	static class AnonymousKeyConfig {

		@Bean
		SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
			// @formatter:off
			http
				.authorizeHttpRequests((requests) -> requests
					.requestMatchers("/key").anonymous()
					.anyRequest().denyAll())
				.anonymous((anonymous) -> anonymous.key("AnonymousKeyConfig"));
			return http.build();
			// @formatter:on
		}

	}

	@Configuration
	@EnableWebSecurity
	@EnableWebMvc
	static class AnonymousUsernameConfig {

		@Bean
		SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
			// @formatter:off
			http
				.authorizeHttpRequests((requests) -> requests
					.requestMatchers("/principal").anonymous()
					.anyRequest().denyAll())
				.anonymous((anonymous) -> anonymous.principal("AnonymousUsernameConfig"));
			return http.build();
			// @formatter:on
		}

	}

	@RestController
	static class AnonymousController {

		@GetMapping("/type")
		String type() {
			return anonymousToken().map(AnonymousAuthenticationToken::getClass).map(Class::getSimpleName).orElse(null);
		}

		@GetMapping("/key")
		String key() {
			return anonymousToken().map(AnonymousAuthenticationToken::getKeyHash).map(String::valueOf).orElse(null);
		}

		@GetMapping("/principal")
		String principal() {
			return anonymousToken().map(AnonymousAuthenticationToken::getName).orElse(null);
		}

		Optional<AnonymousAuthenticationToken> anonymousToken() {
			return Optional.of(SecurityContextHolder.getContext())
				.map(SecurityContext::getAuthentication)
				.filter((a) -> a instanceof AnonymousAuthenticationToken)
				.map(AnonymousAuthenticationToken.class::cast);
		}

	}

}
