/*
 * 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.server.header;

import java.time.Duration;

import org.junit.jupiter.api.Test;

import org.springframework.http.HttpHeaders;
import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
import org.springframework.mock.web.server.MockServerWebExchange;
import org.springframework.web.server.ServerWebExchange;

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

/**
 * @author Rob Winch
 * @since 5.0
 */
public class StrictTransportSecurityServerHttpHeadersWriterTests {

	StrictTransportSecurityServerHttpHeadersWriter hsts = new StrictTransportSecurityServerHttpHeadersWriter();

	ServerWebExchange exchange;

	@Test
	public void writeHttpHeadersWhenHttpsThenWrites() {
		this.exchange = exchange(MockServerHttpRequest.get("https://example.com/"));
		this.hsts.writeHttpHeaders(this.exchange);
		HttpHeaders headers = this.exchange.getResponse().getHeaders();
		assertThat(headers.headerNames()).hasSize(1);
		assertThat(headers.containsHeaderValue(StrictTransportSecurityServerHttpHeadersWriter.STRICT_TRANSPORT_SECURITY,
				"max-age=31536000 ; includeSubDomains"))
			.isTrue();
	}

	@Test
	public void writeHttpHeadersWhenCustomMaxAgeThenWrites() {
		Duration maxAge = Duration.ofDays(1);
		this.hsts.setMaxAge(maxAge);
		this.exchange = exchange(MockServerHttpRequest.get("https://example.com/"));
		this.hsts.writeHttpHeaders(this.exchange);
		HttpHeaders headers = this.exchange.getResponse().getHeaders();
		assertThat(headers.headerNames()).hasSize(1);
		assertThat(headers.containsHeaderValue(StrictTransportSecurityServerHttpHeadersWriter.STRICT_TRANSPORT_SECURITY,
				"max-age=" + maxAge.getSeconds() + " ; includeSubDomains"));
	}

	@Test
	public void writeHttpHeadersWhenCustomIncludeSubDomainsThenWrites() {
		this.hsts.setIncludeSubDomains(false);
		this.exchange = exchange(MockServerHttpRequest.get("https://example.com/"));
		this.hsts.writeHttpHeaders(this.exchange);
		HttpHeaders headers = this.exchange.getResponse().getHeaders();
		assertThat(headers.headerNames()).hasSize(1);
		assertThat(headers.containsHeaderValue(StrictTransportSecurityServerHttpHeadersWriter.STRICT_TRANSPORT_SECURITY,
				"max-age=31536000"));
	}

	@Test
	public void writeHttpHeadersWhenNullSchemeThenNoHeaders() {
		this.exchange = exchange(MockServerHttpRequest.get("/"));
		this.hsts.writeHttpHeaders(this.exchange);
		HttpHeaders headers = this.exchange.getResponse().getHeaders();
		assertThat(headers.headerNames()).isEmpty();
	}

	@Test
	public void writeHttpHeadersWhenHttpThenNoHeaders() {
		this.exchange = exchange(MockServerHttpRequest.get("http://localhost/"));
		this.hsts.writeHttpHeaders(this.exchange);
		HttpHeaders headers = this.exchange.getResponse().getHeaders();
		assertThat(headers.headerNames()).isEmpty();
	}

	private static MockServerWebExchange exchange(MockServerHttpRequest.BaseBuilder<?> request) {
		return MockServerWebExchange.from(request.build());
	}

}
