/*
 * Copyright 2002-2017 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
 *
 *      http://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.web.header.writers.frameoptions;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.when;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.mock.web.MockHttpServletResponse;
import org.springframework.security.web.header.writers.frameoptions.AllowFromStrategy;
import org.springframework.security.web.header.writers.frameoptions.XFrameOptionsHeaderWriter;
import org.springframework.security.web.header.writers.frameoptions.XFrameOptionsHeaderWriter.XFrameOptionsMode;

/**
 * @author Rob Winch
 *
 */
@RunWith(MockitoJUnitRunner.class)
public class FrameOptionsHeaderWriterTests {
	@Mock
	private AllowFromStrategy strategy;

	private MockHttpServletResponse response;

	private MockHttpServletRequest request;

	private XFrameOptionsHeaderWriter writer;

	@Before
	public void setup() {
		request = new MockHttpServletRequest();
		response = new MockHttpServletResponse();
	}

	@Test(expected = IllegalArgumentException.class)
	public void constructorNullMode() {
		new XFrameOptionsHeaderWriter((XFrameOptionsMode) null);
	}

	@Test(expected = IllegalArgumentException.class)
	public void constructorAllowFromNoAllowFromStrategy() {
		new XFrameOptionsHeaderWriter(XFrameOptionsMode.ALLOW_FROM);
	}

	@Test(expected = IllegalArgumentException.class)
	public void constructorNullAllowFromStrategy() {
		new XFrameOptionsHeaderWriter((AllowFromStrategy) null);
	}

	@Test
	public void writeHeadersAllowFromReturnsNull() {
		writer = new XFrameOptionsHeaderWriter(strategy);

		writer.writeHeaders(request, response);

		assertThat(response.getHeaderNames().isEmpty()).isTrue();
	}

	@Test
	public void writeHeadersAllowFrom() {
		String allowFromValue = "https://example.com/";
		when(strategy.getAllowFromValue(request)).thenReturn(allowFromValue);
		writer = new XFrameOptionsHeaderWriter(strategy);

		writer.writeHeaders(request, response);

		assertThat(response.getHeaderNames()).hasSize(1);
		assertThat(response.getHeader(XFrameOptionsHeaderWriter.XFRAME_OPTIONS_HEADER))
				.isEqualTo("ALLOW-FROM " + allowFromValue);
	}

	@Test
	public void writeHeadersDeny() {
		writer = new XFrameOptionsHeaderWriter(XFrameOptionsMode.DENY);

		writer.writeHeaders(request, response);

		assertThat(response.getHeaderNames()).hasSize(1);
		assertThat(response.getHeader(XFrameOptionsHeaderWriter.XFRAME_OPTIONS_HEADER))
				.isEqualTo("DENY");
	}

	@Test
	public void writeHeadersSameOrigin() {
		writer = new XFrameOptionsHeaderWriter(XFrameOptionsMode.SAMEORIGIN);

		writer.writeHeaders(request, response);

		assertThat(response.getHeaderNames()).hasSize(1);
		assertThat(response.getHeader(XFrameOptionsHeaderWriter.XFRAME_OPTIONS_HEADER))
				.isEqualTo("SAMEORIGIN");
	}

	@Test
	public void writeHeadersTwiceLastWins() {
		writer = new XFrameOptionsHeaderWriter(XFrameOptionsMode.SAMEORIGIN);
		writer.writeHeaders(request, response);

		writer = new XFrameOptionsHeaderWriter(XFrameOptionsMode.DENY);
		writer.writeHeaders(request, response);

		assertThat(response.getHeaderNames()).hasSize(1);
		assertThat(response.getHeader(XFrameOptionsHeaderWriter.XFRAME_OPTIONS_HEADER))
				.isEqualTo("DENY");
	}
}
