content: /*
   * 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.camel.component.http;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.zip.GZIPInputStream;
  import java.util.zip.GZIPOutputStream;
  
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.apache.camel.component.http.handler.HeaderValidationHandler;
  import org.apache.camel.component.http.interceptor.ResponseBasicUnauthorized;
  import org.apache.hc.core5.http.ClassicHttpRequest;
  import org.apache.hc.core5.http.ClassicHttpResponse;
  import org.apache.hc.core5.http.EntityDetails;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpEntity;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.HttpRequest;
  import org.apache.hc.core5.http.HttpRequestInterceptor;
  import org.apache.hc.core5.http.HttpResponse;
  import org.apache.hc.core5.http.HttpResponseInterceptor;
  import org.apache.hc.core5.http.HttpStatus;
  import org.apache.hc.core5.http.impl.bootstrap.HttpServer;
  import org.apache.hc.core5.http.impl.bootstrap.ServerBootstrap;
  import org.apache.hc.core5.http.io.entity.HttpEntityWrapper;
  import org.apache.hc.core5.http.protocol.DefaultHttpProcessor;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.apache.hc.core5.http.protocol.HttpProcessor;
  import org.apache.hc.core5.http.protocol.RequestValidateHost;
  import org.junit.jupiter.api.Test;
  
  import static org.apache.camel.http.common.HttpMethods.POST;
  import static org.apache.hc.core5.http.ContentType.TEXT_PLAIN;
  import static org.apache.hc.core5.http.HttpHeaders.CONTENT_ENCODING;
  import static org.apache.hc.core5.http.HttpHeaders.CONTENT_TYPE;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  public class HttpCompressionTest extends BaseHttpTest {
  
      private HttpServer localServer;
  
      @Override
      public void setupResources() throws Exception {
          Map<String, String> expectedHeaders = new HashMap<>();
          expectedHeaders.put(CONTENT_TYPE, TEXT_PLAIN.getMimeType());
          expectedHeaders.put(CONTENT_ENCODING, "gzip");
  
          localServer = ServerBootstrap.bootstrap()
                  .setCanonicalHostName("localhost").setHttpProcessor(getBasicHttpProcessor())
                  .setConnectionReuseStrategy(getConnectionReuseStrategy()).setResponseFactory(getHttpResponseFactory())
                  .setSslContext(getSSLContext())
                  .register("/",
                          new HeaderValidationHandler(POST.name(), null, getBody(), getExpectedContent(), expectedHeaders))
                  .create();
          localServer.start();
      }
  
      @Override
      public void cleanupResources() throws Exception {
  
          if (localServer != null) {
              localServer.stop();
          }
      }
  
      @Test
      public void compressedHttpPost() {
          Exchange exchange = template.request(
                  "http://localhost:" + localServer.getLocalPort() + "/", exchange1 -> {
                      exchange1.getIn().setHeader(Exchange.CONTENT_TYPE, "text/plain");
                      exchange1.getIn().setHeader(Exchange.CONTENT_ENCODING, "gzip");
                      exchange1.getIn().setBody(getBody());
                  });
  
          assertNotNull(exchange);
  
          Message out = exchange.getMessage();
          assertNotNull(out);
  
          Map<String, Object> headers = out.getHeaders();
          assertEquals(HttpStatus.SC_OK, headers.get(Exchange.HTTP_RESPONSE_CODE));
  
          assertBody(out.getBody(String.class));
      }
  
      @Override
      protected HttpProcessor getBasicHttpProcessor() {
          List<HttpRequestInterceptor> requestInterceptors = new ArrayList<>();
          requestInterceptors.add(new RequestValidateHost());
          requestInterceptors.add(new RequestDecompressingInterceptor());
          List<HttpResponseInterceptor> responseInterceptors = new ArrayList<>();
          responseInterceptors.add(new ResponseCompressingInterceptor());
          responseInterceptors.add(new ResponseBasicUnauthorized());
  
          return new DefaultHttpProcessor(requestInterceptors, responseInterceptors);
      }
  
      protected String getBody() {
          return "hl=en&q=camel";
      }
  
      static class RequestDecompressingInterceptor implements HttpRequestInterceptor {
  
          @Override
          public void process(HttpRequest request, EntityDetails details, HttpContext context) throws HttpException {
              Header contentEncoding = request.getFirstHeader(CONTENT_ENCODING);
  
              if (contentEncoding != null
                      && contentEncoding.getValue().equalsIgnoreCase("gzip")) {
                  ClassicHttpRequest classicHttpRequest = (ClassicHttpRequest) request;
                  HttpEntity entity = classicHttpRequest.getEntity();
                  classicHttpRequest.setEntity(new GzipDecompressingEntity(entity));
              }
          }
  
          static class GzipDecompressingEntity extends HttpEntityWrapper {
  
              GzipDecompressingEntity(final HttpEntity entity) {
                  super(entity);
              }
  
              @Override
              public InputStream getContent()
                      throws IOException,
                      IllegalStateException {
                  return new GZIPInputStream(super.getContent());
              }
  
              @Override
              public long getContentLength() {
                  return -1;
              }
  
              @Override
              public boolean isStreaming() {
                  return false;
              }
          }
      }
  
      static class ResponseCompressingInterceptor implements HttpResponseInterceptor {
  
          @Override
          public void process(HttpResponse response, EntityDetails details, HttpContext context)
                  throws HttpException {
              response.setHeader(CONTENT_ENCODING, "gzip");
              ClassicHttpResponse classicHttpResponse = (ClassicHttpResponse) response;
              HttpEntity entity = classicHttpResponse.getEntity();
              classicHttpResponse.setEntity(new GzipCompressingEntity(entity));
          }
  
          static class GzipCompressingEntity extends HttpEntityWrapper {
  
              GzipCompressingEntity(final HttpEntity entity) {
                  super(entity);
              }
  
              @Override
              public String getContentEncoding() {
                  return "gzip";
              }
  
              @Override
              public void writeTo(OutputStream outStream) throws IOException {
                  try (GZIPOutputStream gzip = new GZIPOutputStream(outStream)) {
                      super.writeTo(gzip);
                  }
              }
  
              @Override
              public long getContentLength() {
                  return -1;
              }
  
              @Override
              public boolean isStreaming() {
                  return false;
              }
          }
      }
  }
  