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.handler;
  
  import java.io.IOException;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.nio.charset.StandardCharsets;
  
  import org.apache.hc.core5.http.ClassicHttpRequest;
  import org.apache.hc.core5.http.ClassicHttpResponse;
  import org.apache.hc.core5.http.HttpEntity;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.HttpStatus;
  import org.apache.hc.core5.http.io.HttpRequestHandler;
  import org.apache.hc.core5.http.io.entity.EntityUtils;
  import org.apache.hc.core5.http.io.entity.StringEntity;
  import org.apache.hc.core5.http.protocol.HttpContext;
  
  public class BasicValidationHandler implements HttpRequestHandler {
  
      protected String expectedUri;
      protected final String expectedMethod;
      protected final String expectedQuery;
      protected final Object expectedContent;
      protected final String responseContent;
  
      public BasicValidationHandler(String expectedMethod, String expectedQuery,
                                    Object expectedContent, String responseContent) {
          this.expectedMethod = expectedMethod;
          this.expectedQuery = expectedQuery;
          this.expectedContent = expectedContent;
          this.responseContent = responseContent;
      }
  
      public BasicValidationHandler(String expectedUri, String expectedMethod, String expectedQuery,
                                    Object expectedContent, String responseContent) {
          this.expectedUri = expectedUri;
          this.expectedMethod = expectedMethod;
          this.expectedQuery = expectedQuery;
          this.expectedContent = expectedContent;
          this.responseContent = responseContent;
      }
  
      @Override
      public void handle(
              final ClassicHttpRequest request, final ClassicHttpResponse response,
              final HttpContext context)
              throws HttpException, IOException {
  
          if (expectedUri != null && !expectedUri.equals(request.getRequestUri())) {
              response.setCode(HttpStatus.SC_BAD_REQUEST);
              return;
          }
  
          if (expectedMethod != null && !expectedMethod.equals(request.getMethod())) {
              response.setCode(HttpStatus.SC_METHOD_FAILURE);
              return;
          }
  
          if (!validateQuery(request)) {
              response.setCode(HttpStatus.SC_BAD_REQUEST);
              return;
          }
  
          if (!validateRequestEncoding(request)) {
              response.setCode(HttpStatus.SC_BAD_REQUEST);
              response.setReasonPhrase("Request URI not encoded correctly!");
              return;
          }
  
          if (expectedContent != null) {
              HttpEntity entity = request.getEntity();
              String content = EntityUtils.toString(entity);
  
              if (!expectedContent.equals(content)) {
                  response.setCode(HttpStatus.SC_BAD_REQUEST);
                  return;
              }
          }
  
          response.setCode(HttpStatus.SC_OK);
          String content = buildResponse(request);
          if (content != null) {
              response.setEntity(new StringEntity(content, StandardCharsets.US_ASCII));
          }
      }
  
      protected boolean validateQuery(ClassicHttpRequest request) throws IOException {
          try {
              String query = request.getUri().getQuery();
              if (expectedQuery != null && !expectedQuery.equals(query)) {
                  return false;
              }
          } catch (URISyntaxException e) {
              throw new IOException(e);
          }
          return true;
      }
  
      protected boolean validateRequestEncoding(ClassicHttpRequest request) throws IOException {
          try {
              String encodedRequestPath = new URI(request.getPath()).toASCIIString();
              return request.getPath().equals(encodedRequestPath); // Did request.path contain un-encoded characters?
          } catch (URISyntaxException e) {
              throw new IOException(e);
          }
      }
  
      protected String buildResponse(ClassicHttpRequest request) {
          return responseContent;
      }
  
  }
  