/*
 * Copyright 2013-2020 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.cloud.gateway.filter.factory;

import org.junit.jupiter.api.Test;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.factory.RequestHeaderSizeGatewayFilterFactory.Config;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
import org.springframework.cloud.gateway.test.BaseWebClientTests;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
import org.springframework.http.HttpStatus;
import org.springframework.test.annotation.DirtiesContext;
import org.springframework.util.unit.DataSize;
import org.springframework.util.unit.DataUnit;

import static org.assertj.core.api.Assertions.assertThat;
import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;

/**
 * @author Sakalya Deshpande
 * @author Marta Medio
 */

@SpringBootTest(webEnvironment = RANDOM_PORT)
@DirtiesContext
public class RequestHeaderSizeGatewayFilterFactoryTest extends BaseWebClientTests {

	private static final String longString = "11111111112222222222333333333344444444445555555";

	@Test
	public void setRequestHeaderSizeFilterWorks() {
		System.err.println("Here: " + longString.length() + ", " + longString.getBytes().length);
		testClient.get().uri("/headers").header("Host", "www.testrequestheadersizefilter.org")
				.header("HeaderName", longString).exchange().expectStatus()
				.isEqualTo(HttpStatus.REQUEST_HEADER_FIELDS_TOO_LARGE).expectHeader().value("errorMessage",
						header -> assertThat(header).contains("permissible limit (46B)", "'HeaderName' is 57B"));
	}

	@Test
	public void setRequestHeaderSizeFilterShortcutWorks() {
		testClient.get().uri("/headers").header("Host", "www.requestheadersize.org").header("HeaderName", longString)
				.exchange().expectStatus().isEqualTo(HttpStatus.REQUEST_HEADER_FIELDS_TOO_LARGE).expectHeader()
				.value("errorMessage",
						header -> assertThat(header).contains("permissible limit (46B)", "'HeaderName' is 57B"));
	}

	@Test
	public void setRequestHeaderSizeFilterMultipleHeadersWorks() {
		testClient.get().uri("/headers").header("Host", "www.requestheadersize.org").header("HeaderName", longString)
				.header("HeaderName2", longString).exchange().expectStatus()
				.isEqualTo(HttpStatus.REQUEST_HEADER_FIELDS_TOO_LARGE).expectHeader()
				.value("errorMessage", header -> assertThat(header).contains("permissible limit (46B)",
						"'HeaderName' is 57B", "'HeaderName2' is 58B"));
	}

	@Test
	public void setRequestHeaderSizeFilterTakesIntoAccountHeaderName() {
		testClient.get().uri("/headers").header("Host", "www.testrequestheadersizefiltername.org")
				.header("HeaderName", longString).exchange().expectStatus()
				.isEqualTo(HttpStatus.REQUEST_HEADER_FIELDS_TOO_LARGE).expectHeader().value("errorMessage",
						header -> assertThat(header).contains("permissible limit (47B)", "'HeaderName' is 57B"));
	}

	@Test
	public void toStringFormat() {
		Config config = new Config();
		config.setMaxSize(DataSize.ofBytes(1000L));
		GatewayFilter filter = new RequestHeaderSizeGatewayFilterFactory().apply(config);
		assertThat(filter.toString()).contains("maxSize").contains("1000B");
	}

	@EnableAutoConfiguration
	@SpringBootConfiguration
	@Import(DefaultTestConfig.class)
	public static class TestConfig {

		@Value("${test.uri}")
		String uri;

		@Bean
		public RouteLocator testRouteLocator(RouteLocatorBuilder builder) {
			return builder.routes()
					.route("test_request_header_size",
							r -> r.order(-1).host("**.testrequestheadersizefilter.org")
									.filters(f -> f.setRequestHeaderSize(DataSize.of(46L, DataUnit.BYTES))).uri(uri))
					.route("test_request_header_size_name",
							r -> r.order(1).host("**.testrequestheadersizefiltername.org")
									.filters(f -> f.setRequestHeaderSize(DataSize.of(47L, DataUnit.BYTES))).uri(uri))
					.build();
		}

	}

}
