/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.felix.http.jetty.it;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.ops4j.pax.exam.CoreOptions.mavenBundle;
import static org.ops4j.pax.exam.cm.ConfigurationAdminOptions.newConfiguration;

import java.io.IOException;
import java.net.URI;
import java.util.Hashtable;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

import javax.inject.Inject;
import jakarta.servlet.Servlet;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import org.eclipse.jetty.client.CompletableResponseListener;
import org.eclipse.jetty.client.ContentResponse;
import org.eclipse.jetty.client.FormRequestContent;
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.Request;
import org.eclipse.jetty.util.Fields;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.ops4j.pax.exam.Option;
import org.ops4j.pax.exam.junit.PaxExam;
import org.ops4j.pax.exam.spi.reactors.ExamReactorStrategy;
import org.ops4j.pax.exam.spi.reactors.PerClass;
import org.osgi.framework.BundleContext;
import org.osgi.service.http.HttpService;
import org.osgi.service.servlet.whiteboard.HttpWhiteboardConstants;

@RunWith(PaxExam.class)
@ExamReactorStrategy(PerClass.class)
public class JettySizeLimitHandlerIT extends AbstractJettyTestSupport {
    private static final int LIMIT_IN_BYTES = 10;

    @Inject
    protected BundleContext bundleContext;

    @Override
    protected Option[] additionalOptions() throws IOException {
        String jettyVersion = System.getProperty("jetty.version", JETTY_VERSION);
        return new Option[] {
                spifly(),

                // bundles for the server side
                mavenBundle().groupId("org.eclipse.jetty.ee11").artifactId("jetty-ee11-webapp").version(jettyVersion),
                mavenBundle().groupId("org.eclipse.jetty.ee11").artifactId("jetty-ee11-servlet").version(jettyVersion),
                mavenBundle().groupId("org.eclipse.jetty").artifactId("jetty-xml").version(jettyVersion),

                // additional bundles for the client side
                mavenBundle().groupId("org.eclipse.jetty").artifactId("jetty-alpn-client").version(jettyVersion),
                mavenBundle().groupId("org.eclipse.jetty").artifactId("jetty-client").version(jettyVersion)
        };
    }

    @Override
    protected Option felixHttpConfig(int httpPort) {
        return newConfiguration("org.apache.felix.http")
                .put("org.osgi.service.http.port", httpPort)
                .put("org.apache.felix.http.jetty.requestSizeLimit", LIMIT_IN_BYTES) // 10 bytes limit for the request
                .put("org.apache.felix.http.jetty.responseSizeLimit", LIMIT_IN_BYTES) // 10 bytes limit for the response
                .asOption();
    }

    @Before
    public void setup(){
        assertNotNull(bundleContext);
        bundleContext.registerService(Servlet.class, new HelloWorldServletWithinLimit(), new Hashtable<>(Map.of(
                HttpWhiteboardConstants.HTTP_WHITEBOARD_SERVLET_PATTERN, "/withinlimit/*"
        )));
        bundleContext.registerService(Servlet.class, new HelloWorldServletExceedingLimit(), new Hashtable<>(Map.of(
                HttpWhiteboardConstants.HTTP_WHITEBOARD_SERVLET_PATTERN, "/exceedinglimit/*"
        )));
    }


    @Test
    public void testRequestResponseLimits() throws Exception {
        try (HttpClient httpClient = new HttpClient()) {
            httpClient.start();
            Object value = bundleContext.getServiceReference(HttpService.class).getProperty("org.osgi.service.http.port");
            int httpPort = Integer.parseInt((String) value);

            Fields formFields = new Fields();
            formFields.add(new Fields.Field("key","value")); // under 10 bytes
            ContentResponse responseWithinLimit = httpClient.FORM(new URI(String.format("http://localhost:%d/withinlimit/a", httpPort)), formFields);

            // Request limit ok, response limit ok
            assertEquals(200, responseWithinLimit.getStatus());
            assertEquals("OK", responseWithinLimit.getContentAsString());

            // Request limit ok, response limit exceeded
            // org.eclipse.jetty.http.HttpException$RuntimeException: 500: Response body is too large: 17>10
            ContentResponse responseExceedingLimit = httpClient.FORM(new URI(String.format("http://localhost:%d/exceedinglimit/a", httpPort)), formFields);

            assertEquals(500, responseExceedingLimit.getStatus());

            Fields formFieldsLimitExceeded = new Fields();
            formFieldsLimitExceeded.add(new Fields.Field("key","valueoverlimit")); // over limit of 10 bytes

            Request request = httpClient.newRequest(new URI(String.format("http://localhost:%d/withinlimit/a", httpPort)))
                    .body(new FormRequestContent(formFieldsLimitExceeded));

            CompletableFuture<ContentResponse> completable = new CompletableResponseListener(request).send();
            ContentResponse response = completable.get();
            assertEquals(413, response.getStatus());
        }
    }

    static final class HelloWorldServletWithinLimit extends HttpServlet {
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            resp.setStatus(200);
            resp.getWriter().write("OK");
        }
    }

    static final class HelloWorldServletExceedingLimit extends HttpServlet {
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            resp.setStatus(200);
            resp.getWriter().write("responseoverlimit");
        }
    }
}
