/*
 * 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.web.header.writers;

import java.util.Arrays;
import java.util.Collections;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.mock.web.MockHttpServletResponse;
import org.springframework.security.web.header.Header;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;

/**
 * Test for the {@code StaticHeadersWriter}
 *
 * @author Marten Deinum
 * @author Rob Winch
 * @author Ankur Pathak
 * @since 3.2
 */
public class StaticHeaderWriterTests {

	private MockHttpServletRequest request;

	private MockHttpServletResponse response;

	@BeforeEach
	public void setup() {
		this.request = new MockHttpServletRequest();
		this.response = new MockHttpServletResponse();
	}

	@Test
	public void constructorNullHeaders() {
		assertThatIllegalArgumentException().isThrownBy(() -> new StaticHeadersWriter(null));
	}

	@Test
	public void constructorEmptyHeaders() {
		assertThatIllegalArgumentException().isThrownBy(() -> new StaticHeadersWriter(Collections.<Header>emptyList()));
	}

	@Test
	public void constructorNullHeaderName() {
		assertThatIllegalArgumentException().isThrownBy(() -> new StaticHeadersWriter(null, "value1"));
	}

	@Test
	public void constructorNullHeaderValues() {
		assertThatIllegalArgumentException().isThrownBy(() -> new StaticHeadersWriter("name", (String[]) null));
	}

	@Test
	public void constructorContainsNullHeaderValue() {
		assertThatIllegalArgumentException().isThrownBy(() -> new StaticHeadersWriter("name", "value1", null));
	}

	@Test
	public void sameHeaderShouldBeReturned() {
		String headerName = "X-header";
		String headerValue = "foo";
		StaticHeadersWriter factory = new StaticHeadersWriter(headerName, headerValue);
		factory.writeHeaders(this.request, this.response);
		assertThat(this.response.getHeaderValues(headerName)).isEqualTo(Arrays.asList(headerValue));
	}

	@Test
	public void writeHeadersMulti() {
		Header pragma = new Header("Pragma", "no-cache");
		Header cacheControl = new Header("Cache-Control", "no-cache", "no-store", "must-revalidate");
		StaticHeadersWriter factory = new StaticHeadersWriter(Arrays.asList(pragma, cacheControl));
		factory.writeHeaders(this.request, this.response);
		assertThat(this.response.getHeaderNames()).hasSize(2);
		assertThat(this.response.getHeaderValues(pragma.getName())).isEqualTo(pragma.getValues());
		assertThat(this.response.getHeaderValues(cacheControl.getName())).isEqualTo(cacheControl.getValues());
	}

	@Test
	public void writeHeaderWhenNotPresent() {
		String pragmaValue = new String("pragmaValue");
		String cacheControlValue = new String("cacheControlValue");
		this.response.setHeader("Pragma", pragmaValue);
		this.response.setHeader("Cache-Control", cacheControlValue);
		Header pragma = new Header("Pragma", "no-cache");
		Header cacheControl = new Header("Cache-Control", "no-cache", "no-store", "must-revalidate");
		StaticHeadersWriter factory = new StaticHeadersWriter(Arrays.asList(pragma, cacheControl));
		factory.writeHeaders(this.request, this.response);
		assertThat(this.response.getHeaderNames()).hasSize(2);
		assertThat(this.response.getHeader("Pragma")).isSameAs(pragmaValue);
		assertThat(this.response.getHeader("Cache-Control")).isSameAs(cacheControlValue);
	}

}
