/*
 * Copyright 2012-2020 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.boot.autoconfigure.web.embedded;

import java.io.File;
import java.io.IOException;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.SynchronousQueue;
import java.util.stream.Collectors;

import org.eclipse.jetty.server.AbstractConnector;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.CustomRequestLog;
import org.eclipse.jetty.server.HttpConfiguration;
import org.eclipse.jetty.server.HttpConfiguration.ConnectionFactory;
import org.eclipse.jetty.server.RequestLog;
import org.eclipse.jetty.server.RequestLogWriter;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.util.BlockingArrayQueue;
import org.eclipse.jetty.util.thread.QueuedThreadPool;
import org.eclipse.jetty.util.thread.ThreadPool;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import org.springframework.boot.autoconfigure.web.ServerProperties;
import org.springframework.boot.autoconfigure.web.ServerProperties.ForwardHeadersStrategy;
import org.springframework.boot.autoconfigure.web.ServerProperties.Jetty;
import org.springframework.boot.context.properties.bind.Bindable;
import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.boot.context.properties.source.ConfigurationPropertySources;
import org.springframework.boot.web.embedded.jetty.ConfigurableJettyWebServerFactory;
import org.springframework.boot.web.embedded.jetty.JettyServletWebServerFactory;
import org.springframework.boot.web.embedded.jetty.JettyWebServer;
import org.springframework.mock.env.MockEnvironment;
import org.springframework.test.context.support.TestPropertySourceUtils;
import org.springframework.test.util.ReflectionTestUtils;

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

/**
 * Tests for {@link JettyWebServerFactoryCustomizer}.
 *
 * @author Brian Clozel
 * @author Phillip Webb
 * @author HaiTao Zhang
 */
class JettyWebServerFactoryCustomizerTests {

	private MockEnvironment environment;

	private ServerProperties serverProperties;

	private JettyWebServerFactoryCustomizer customizer;

	@BeforeEach
	void setup() {
		this.environment = new MockEnvironment();
		this.serverProperties = new ServerProperties();
		ConfigurationPropertySources.attach(this.environment);
		this.customizer = new JettyWebServerFactoryCustomizer(this.environment, this.serverProperties);
	}

	@Test
	void deduceUseForwardHeaders() {
		this.environment.setProperty("DYNO", "-");
		ConfigurableJettyWebServerFactory factory = mock(ConfigurableJettyWebServerFactory.class);
		this.customizer.customize(factory);
		verify(factory).setUseForwardHeaders(true);
	}

	@Test
	void defaultUseForwardHeaders() {
		ConfigurableJettyWebServerFactory factory = mock(ConfigurableJettyWebServerFactory.class);
		this.customizer.customize(factory);
		verify(factory).setUseForwardHeaders(false);
	}

	@Test
	void forwardHeadersWhenStrategyIsNativeShouldConfigureValve() {
		this.serverProperties.setForwardHeadersStrategy(ServerProperties.ForwardHeadersStrategy.NATIVE);
		ConfigurableJettyWebServerFactory factory = mock(ConfigurableJettyWebServerFactory.class);
		this.customizer.customize(factory);
		verify(factory).setUseForwardHeaders(true);
	}

	@Test
	void forwardHeadersWhenStrategyIsNoneShouldNotConfigureValve() {
		this.environment.setProperty("DYNO", "-");
		this.serverProperties.setForwardHeadersStrategy(ServerProperties.ForwardHeadersStrategy.NONE);
		ConfigurableJettyWebServerFactory factory = mock(ConfigurableJettyWebServerFactory.class);
		this.customizer.customize(factory);
		verify(factory).setUseForwardHeaders(false);
	}

	@Test
	void accessLogCanBeCustomized() throws IOException {
		File logFile = File.createTempFile("jetty_log", ".log");
		bind("server.jetty.accesslog.enabled=true", "server.jetty.accesslog.format=extended_ncsa",
				"server.jetty.accesslog.filename=" + logFile.getAbsolutePath().replace("\\", "\\\\"),
				"server.jetty.accesslog.file-date-format=yyyy-MM-dd", "server.jetty.accesslog.retention-period=42",
				"server.jetty.accesslog.append=true", "server.jetty.accesslog.ignore-paths=/a/path,/b/path");
		JettyWebServer server = customizeAndGetServer();
		CustomRequestLog requestLog = getRequestLog(server);
		assertThat(requestLog.getFormatString()).isEqualTo(CustomRequestLog.EXTENDED_NCSA_FORMAT);
		assertThat(requestLog.getIgnorePaths()).hasSize(2);
		assertThat(requestLog.getIgnorePaths()).containsExactly("/a/path", "/b/path");
		RequestLogWriter logWriter = getLogWriter(requestLog);
		assertThat(logWriter.getFileName()).isEqualTo(logFile.getAbsolutePath());
		assertThat(logWriter.getFilenameDateFormat()).isEqualTo("yyyy-MM-dd");
		assertThat(logWriter.getRetainDays()).isEqualTo(42);
		assertThat(logWriter.isAppend()).isTrue();
	}

	@Test
	void accessLogCanBeEnabled() {
		bind("server.jetty.accesslog.enabled=true");
		JettyWebServer server = customizeAndGetServer();
		CustomRequestLog requestLog = getRequestLog(server);
		assertThat(requestLog.getFormatString()).isEqualTo(CustomRequestLog.NCSA_FORMAT);
		assertThat(requestLog.getIgnorePaths()).isNull();
		RequestLogWriter logWriter = getLogWriter(requestLog);
		assertThat(logWriter.getFileName()).isNull();
		assertThat(logWriter.isAppend()).isFalse();
	}

	@Test
	void threadPoolMatchesJettyDefaults() {
		ThreadPool defaultThreadPool = new Server(0).getThreadPool();
		ThreadPool configuredThreadPool = customizeAndGetServer().getServer().getThreadPool();
		assertThat(defaultThreadPool).isInstanceOf(QueuedThreadPool.class);
		assertThat(configuredThreadPool).isInstanceOf(QueuedThreadPool.class);
		QueuedThreadPool defaultQueuedThreadPool = (QueuedThreadPool) defaultThreadPool;
		QueuedThreadPool configuredQueuedThreadPool = (QueuedThreadPool) configuredThreadPool;
		assertThat(configuredQueuedThreadPool.getMinThreads()).isEqualTo(defaultQueuedThreadPool.getMinThreads());
		assertThat(configuredQueuedThreadPool.getMaxThreads()).isEqualTo(defaultQueuedThreadPool.getMaxThreads());
		assertThat(configuredQueuedThreadPool.getIdleTimeout()).isEqualTo(defaultQueuedThreadPool.getIdleTimeout());
		BlockingQueue<?> defaultQueue = getQueue(defaultThreadPool);
		BlockingQueue<?> configuredQueue = getQueue(configuredThreadPool);
		assertThat(defaultQueue).isInstanceOf(BlockingArrayQueue.class);
		assertThat(configuredQueue).isInstanceOf(BlockingArrayQueue.class);
		assertThat(((BlockingArrayQueue<?>) defaultQueue).getMaxCapacity())
				.isEqualTo(((BlockingArrayQueue<?>) configuredQueue).getMaxCapacity());
	}

	@Test
	void threadPoolMaxThreadsCanBeCustomized() {
		bind("server.jetty.max-threads=100");
		JettyWebServer server = customizeAndGetServer();
		QueuedThreadPool threadPool = (QueuedThreadPool) server.getServer().getThreadPool();
		assertThat(threadPool.getMaxThreads()).isEqualTo(100);
	}

	@Test
	void threadPoolMinThreadsCanBeCustomized() {
		bind("server.jetty.min-threads=100");
		JettyWebServer server = customizeAndGetServer();
		QueuedThreadPool threadPool = (QueuedThreadPool) server.getServer().getThreadPool();
		assertThat(threadPool.getMinThreads()).isEqualTo(100);
	}

	@Test
	void threadPoolIdleTimeoutCanBeCustomized() {
		bind("server.jetty.threads.idle-timeout=100s");
		JettyWebServer server = customizeAndGetServer();
		QueuedThreadPool threadPool = (QueuedThreadPool) server.getServer().getThreadPool();
		assertThat(threadPool.getIdleTimeout()).isEqualTo(100000);
	}

	@Test
	void threadPoolWithMaxQueueCapacityEqualToZeroCreateSynchronousQueue() {
		bind("server.jetty.threads.max-queue-capacity=0");
		JettyWebServer server = customizeAndGetServer();
		ThreadPool threadPool = server.getServer().getThreadPool();
		BlockingQueue<?> queue = getQueue(threadPool);
		assertThat(queue).isInstanceOf(SynchronousQueue.class);
		assertDefaultThreadPoolSettings(threadPool);
	}

	@Test
	void threadPoolWithMaxQueueCapacityEqualToZeroCustomizesThreadPool() {
		bind("server.jetty.threads.max-queue-capacity=0", "server.jetty.min-threads=100",
				"server.jetty.max-threads=100", "server.jetty.threads.idle-timeout=6s");
		JettyWebServer server = customizeAndGetServer();
		QueuedThreadPool threadPool = (QueuedThreadPool) server.getServer().getThreadPool();
		assertThat(threadPool.getMinThreads()).isEqualTo(100);
		assertThat(threadPool.getMaxThreads()).isEqualTo(100);
		assertThat(threadPool.getIdleTimeout()).isEqualTo(Duration.ofSeconds(6).toMillis());
	}

	@Test
	void threadPoolWithMaxQueueCapacityPositiveCreateBlockingArrayQueue() {
		bind("server.jetty.threads.max-queue-capacity=1234");
		JettyWebServer server = customizeAndGetServer();
		ThreadPool threadPool = server.getServer().getThreadPool();
		BlockingQueue<?> queue = getQueue(threadPool);
		assertThat(queue).isInstanceOf(BlockingArrayQueue.class);
		assertThat(((BlockingArrayQueue<?>) queue).getMaxCapacity()).isEqualTo(1234);
		assertDefaultThreadPoolSettings(threadPool);
	}

	@Test
	void threadPoolWithMaxQueueCapacityPositiveCustomizesThreadPool() {
		bind("server.jetty.threads.max-queue-capacity=1234", "server.jetty.min-threads=10",
				"server.jetty.max-threads=150", "server.jetty.threads.idle-timeout=3s");
		JettyWebServer server = customizeAndGetServer();
		QueuedThreadPool threadPool = (QueuedThreadPool) server.getServer().getThreadPool();
		assertThat(threadPool.getMinThreads()).isEqualTo(10);
		assertThat(threadPool.getMaxThreads()).isEqualTo(150);
		assertThat(threadPool.getIdleTimeout()).isEqualTo(Duration.ofSeconds(3).toMillis());
	}

	private void assertDefaultThreadPoolSettings(ThreadPool threadPool) {
		assertThat(threadPool).isInstanceOf(QueuedThreadPool.class);
		QueuedThreadPool queuedThreadPool = (QueuedThreadPool) threadPool;
		Jetty defaultProperties = new Jetty();
		assertThat(queuedThreadPool.getMinThreads()).isEqualTo(defaultProperties.getMinThreads());
		assertThat(queuedThreadPool.getMaxThreads()).isEqualTo(defaultProperties.getMaxThreads());
		assertThat(queuedThreadPool.getIdleTimeout()).isEqualTo(defaultProperties.getThreadIdleTimeout().toMillis());
	}

	private CustomRequestLog getRequestLog(JettyWebServer server) {
		RequestLog requestLog = server.getServer().getRequestLog();
		assertThat(requestLog).isInstanceOf(CustomRequestLog.class);
		return (CustomRequestLog) requestLog;
	}

	private RequestLogWriter getLogWriter(CustomRequestLog requestLog) {
		RequestLog.Writer writer = requestLog.getWriter();
		assertThat(writer).isInstanceOf(RequestLogWriter.class);
		return (RequestLogWriter) requestLog.getWriter();
	}

	@Test
	void setUseForwardHeaders() {
		this.serverProperties.setForwardHeadersStrategy(ForwardHeadersStrategy.NATIVE);
		ConfigurableJettyWebServerFactory factory = mock(ConfigurableJettyWebServerFactory.class);
		this.customizer.customize(factory);
		verify(factory).setUseForwardHeaders(true);
	}

	@Test
	void customizeMaxHttpHeaderSize() {
		bind("server.max-http-header-size=2048");
		JettyWebServer server = customizeAndGetServer();
		List<Integer> requestHeaderSizes = getRequestHeaderSizes(server);
		assertThat(requestHeaderSizes).containsOnly(2048);
	}

	@Test
	void customMaxHttpHeaderSizeIgnoredIfNegative() {
		bind("server.max-http-header-size=-1");
		JettyWebServer server = customizeAndGetServer();
		List<Integer> requestHeaderSizes = getRequestHeaderSizes(server);
		assertThat(requestHeaderSizes).containsOnly(8192);
	}

	@Test
	void customMaxHttpHeaderSizeIgnoredIfZero() {
		bind("server.max-http-header-size=0");
		JettyWebServer server = customizeAndGetServer();
		List<Integer> requestHeaderSizes = getRequestHeaderSizes(server);
		assertThat(requestHeaderSizes).containsOnly(8192);
	}

	@Test
	void customIdleTimeout() {
		bind("server.jetty.connection-idle-timeout=60s");
		JettyWebServer server = customizeAndGetServer();
		List<Long> timeouts = connectorsIdleTimeouts(server);
		assertThat(timeouts).containsOnly(60000L);
	}

	private List<Long> connectorsIdleTimeouts(JettyWebServer server) {
		// Start (and directly stop) server to have connectors available
		server.start();
		server.stop();
		return Arrays.stream(server.getServer().getConnectors())
				.filter((connector) -> connector instanceof AbstractConnector).map(Connector::getIdleTimeout)
				.collect(Collectors.toList());
	}

	private List<Integer> getRequestHeaderSizes(JettyWebServer server) {
		List<Integer> requestHeaderSizes = new ArrayList<>();
		// Start (and directly stop) server to have connectors available
		server.start();
		server.stop();
		Connector[] connectors = server.getServer().getConnectors();
		for (Connector connector : connectors) {
			connector.getConnectionFactories().stream().filter((factory) -> factory instanceof ConnectionFactory)
					.forEach((cf) -> {
						ConnectionFactory factory = (ConnectionFactory) cf;
						HttpConfiguration configuration = factory.getHttpConfiguration();
						requestHeaderSizes.add(configuration.getRequestHeaderSize());
					});
		}
		return requestHeaderSizes;
	}

	private BlockingQueue<?> getQueue(ThreadPool threadPool) {
		return ReflectionTestUtils.invokeMethod(threadPool, "getQueue");
	}

	private void bind(String... inlinedProperties) {
		TestPropertySourceUtils.addInlinedPropertiesToEnvironment(this.environment, inlinedProperties);
		new Binder(ConfigurationPropertySources.get(this.environment)).bind("server",
				Bindable.ofInstance(this.serverProperties));
	}

	private JettyWebServer customizeAndGetServer() {
		JettyServletWebServerFactory factory = customizeAndGetFactory();
		return (JettyWebServer) factory.getWebServer();
	}

	private JettyServletWebServerFactory customizeAndGetFactory() {
		JettyServletWebServerFactory factory = new JettyServletWebServerFactory(0);
		this.customizer.customize(factory);
		return factory;
	}

}
