/*
 * Copyright 2021 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 example;

import com.j256.twofactorauth.TimeBasedOneTimePasswordUtil;
import jakarta.servlet.http.HttpSession;
import org.junit.jupiter.api.Test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.mock.web.MockHttpSession;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;

import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestBuilders.formLogin;
import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.csrf;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.redirectedUrl;

/**
 * @author Rob Winch
 */
@SpringBootTest
@AutoConfigureMockMvc
public class MfaApplicationTests {

	private static final String hexKey = "80ed266dd80bcd32564f0f4aaa8d9b149a2b1eaa";

	@Autowired
	private MockMvc mockMvc;

	@Test
	void mfaWhenAllFactorsSucceedMatchesThenWorks() throws Exception {
		// @formatter:off
		MvcResult result = this.mockMvc.perform(formLogin()
				.user("user@example.com")
				.password("password"))
				.andExpect(redirectedUrl("/second-factor"))
				.andReturn();

		HttpSession session = result.getRequest().getSession();

		Integer code = TimeBasedOneTimePasswordUtil.generateCurrentNumberHex(hexKey);
		this.mockMvc.perform(post("/second-factor")
				.session((MockHttpSession) session)
				.param("code", String.valueOf(code))
				.with(csrf()))
				.andExpect(redirectedUrl("/third-factor"));

		this.mockMvc.perform(post("/third-factor")
				.session((MockHttpSession) session)
				.param("answer", "smith")
				.with(csrf()))
				.andExpect(redirectedUrl("/"));
		// @formatter:on
	}

	@Test
	void mfaWhenBadCredsThenStillRequestsRemainingFactorsAndRedirects() throws Exception {
		// @formatter:off
		MvcResult result = this.mockMvc.perform(formLogin()
				.user("user@example.com")
				.password("wrongpassword"))
				.andExpect(redirectedUrl("/second-factor"))
				.andReturn();

		HttpSession session = result.getRequest().getSession();

		Integer code = TimeBasedOneTimePasswordUtil.generateCurrentNumberHex(hexKey);
		this.mockMvc.perform(post("/second-factor")
				.session((MockHttpSession) session)
				.param("code", String.valueOf(code))
				.with(csrf()))
				.andExpect(redirectedUrl("/third-factor"));

		this.mockMvc.perform(post("/third-factor")
				.session((MockHttpSession) session)
				.param("answer", "smith")
				.with(csrf()))
				.andExpect(redirectedUrl("/login?error"));
		// @formatter:on
	}

	@Test
	void mfaWhenWrongCodeThenRedirects() throws Exception {
		// @formatter:off
		MvcResult result = this.mockMvc.perform(formLogin()
				.user("user@example.com")
				.password("password"))
				.andExpect(redirectedUrl("/second-factor"))
				.andReturn();

		HttpSession session = result.getRequest().getSession();

		Integer code = TimeBasedOneTimePasswordUtil.generateCurrentNumberHex(hexKey) - 1;
		this.mockMvc.perform(post("/second-factor")
				.session((MockHttpSession) session)
				.param("code", String.valueOf(code))
				.with(csrf()))
				.andExpect(redirectedUrl("/third-factor"));

		this.mockMvc.perform(post("/third-factor")
				.session((MockHttpSession) session)
				.param("answer", "smith")
				.with(csrf()))
				.andExpect(redirectedUrl("/login?error"));
		// @formatter:on
	}

	@Test
	void mfaWhenWrongSecurityAnswerThenRedirects() throws Exception {
		// @formatter:off
		MvcResult result = this.mockMvc.perform(formLogin()
				.user("user@example.com")
				.password("password"))
				.andExpect(redirectedUrl("/second-factor"))
				.andReturn();

		HttpSession session = result.getRequest().getSession();

		Integer code = TimeBasedOneTimePasswordUtil.generateCurrentNumberHex(hexKey);
		this.mockMvc.perform(post("/second-factor")
				.session((MockHttpSession) session)
				.param("code", String.valueOf(code))
				.with(csrf()))
				.andExpect(redirectedUrl("/third-factor"));

		this.mockMvc.perform(post("/third-factor")
				.session((MockHttpSession) session)
				.param("answer", "wilson")
				.with(csrf()))
				.andExpect(redirectedUrl("/login?error"));
		// @formatter:on
	}

	@Test
	void mfaWhenInProcessThenCantViewOtherPages() throws Exception {
		// @formatter:off
		MvcResult result = this.mockMvc.perform(formLogin()
				.user("user@example.com")
				.password("password"))
				.andExpect(redirectedUrl("/second-factor"))
				.andReturn();

		HttpSession session = result.getRequest().getSession();

		this.mockMvc.perform(get("/")
				.session((MockHttpSession) session))
				.andExpect(redirectedUrl("http://localhost/login"));

		result = this.mockMvc.perform(formLogin()
				.user("user@example.com")
				.password("password"))
				.andExpect(redirectedUrl("/second-factor"))
				.andReturn();

		session = result.getRequest().getSession();

		Integer code = TimeBasedOneTimePasswordUtil.generateCurrentNumberHex(hexKey);
		this.mockMvc.perform(post("/second-factor")
				.session((MockHttpSession) session)
				.param("code", String.valueOf(code))
				.with(csrf()))
				.andExpect(redirectedUrl("/third-factor"));

		this.mockMvc.perform(get("/")
				.session((MockHttpSession) session))
				.andExpect(redirectedUrl("http://localhost/login"));
		// @formatter:on
	}

}
