code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC 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.openqa.selenium.remote.codec.w3c;
  
  import static java.net.HttpURLConnection.HTTP_BAD_GATEWAY;
  import static java.net.HttpURLConnection.HTTP_GATEWAY_TIMEOUT;
  import static java.net.HttpURLConnection.HTTP_INTERNAL_ERROR;
  import static java.net.HttpURLConnection.HTTP_OK;
  import static java.nio.charset.StandardCharsets.UTF_8;
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.openqa.selenium.remote.ErrorCodes.METHOD_NOT_ALLOWED;
  import static org.openqa.selenium.remote.http.Contents.bytes;
  
  import com.google.common.collect.ImmutableMap;
  import java.io.Serializable;
  import java.util.HashMap;
  import java.util.Map;
  import org.junit.jupiter.api.Tag;
  import org.junit.jupiter.api.Test;
  import org.openqa.selenium.UnhandledAlertException;
  import org.openqa.selenium.UnsupportedCommandException;
  import org.openqa.selenium.WebDriverException;
  import org.openqa.selenium.json.Json;
  import org.openqa.selenium.remote.ErrorCodes;
  import org.openqa.selenium.remote.Response;
  import org.openqa.selenium.remote.http.HttpResponse;
  
  @Tag("UnitTests")
  class W3CHttpResponseCodecTest {
  
    @Test
    void noErrorNoCry() {
      Map<String, Object> data = new HashMap<>();
      data.put("value", "cheese");
  
      HttpResponse response = createValidResponse(HTTP_OK, data);
  
      Response decoded = new W3CHttpResponseCodec().decode(response);
  
      assertThat(decoded.getStatus().intValue()).isEqualTo(ErrorCodes.SUCCESS);
      assertThat(decoded.getState()).isEqualTo("success");
      assertThat(decoded.getValue()).isEqualTo("cheese");
    }
  
    @Test
    void shouldBeAbleToHandleGatewayTimeoutError() {
      String responseString =
          "<html>\r\n"
              + "<body>\r\n"
              + "<h1>504 Gateway Time-out</h1>\r\n"
              + "The server didn't respond in time.\r\n"
              + "</body>\r\n"
              + "</html>";
  
      byte[] contents = responseString.getBytes(UTF_8);
  
      HttpResponse response = new HttpResponse();
      response.setStatus(HTTP_GATEWAY_TIMEOUT);
      response.addHeader("Server", "nginx");
      response.addHeader("Content-Type", "text/html");
      response.addHeader("Content-Length", String.valueOf(contents.length));
      response.setContent(bytes(contents));
  
      Response decoded = new W3CHttpResponseCodec().decode(response);
  
      assertThat(decoded.getStatus().intValue()).isEqualTo(ErrorCodes.UNHANDLED_ERROR);
      assertThat(decoded.getValue()).isEqualTo(responseString);
    }
  
    @Test
    void shouldBeAbleToHandleBadGatewayError() {
      String responseString =
          "<html>\r\n"
              + "<head><title>502 Bad Gateway</title></head>\r\n"
              + "<body>\r\n"
              + "<center><h1>502 Bad Gateway</h1></center>\r\n"
              + "<hr><center>nginx</center>\r\n"
              + "</body>\r\n"
              + "</html>";
  
      byte[] contents = responseString.getBytes(UTF_8);
  
      HttpResponse response = new HttpResponse();
      response.setStatus(HTTP_BAD_GATEWAY);
      response.addHeader("Server", "nginx");
      response.addHeader("Content-Type", "text/html");
      response.addHeader("Content-Length", String.valueOf(contents.length));
      response.setContent(bytes(contents));
  
      Response decoded = new W3CHttpResponseCodec().decode(response);
  
      assertThat(decoded.getStatus().intValue()).isEqualTo(ErrorCodes.UNHANDLED_ERROR);
      assertThat(decoded.getValue()).isEqualTo(responseString);
    }
  
    @Test
    void decodingAnErrorWithoutAStacktraceIsDecodedProperlyForNonCompliantImplementations() {
      Map<String, Object> error = new HashMap<>();
      error.put("error", "unsupported operation"); // 500
      error.put("message", "I like peas");
      error.put("stacktrace", "");
  
      HttpResponse response = createValidResponse(HTTP_INTERNAL_ERROR, error);
  
      Response decoded = new W3CHttpResponseCodec().decode(response);
  
      assertThat(decoded.getState()).isEqualTo("unsupported operation");
      assertThat(decoded.getStatus().intValue()).isEqualTo(METHOD_NOT_ALLOWED);
  
      assertThat(decoded.getValue()).isInstanceOf(UnsupportedCommandException.class);
      assertThat(((WebDriverException) decoded.getValue()).getMessage()).contains("I like peas");
    }
  
    @Test
    void decodingAnErrorWithoutAStacktraceIsDecodedProperlyForConformingImplementations() {
      Map<String, Object> error = new HashMap<>();
      error.put("error", "unsupported operation"); // 500
      error.put("message", "I like peas");
      error.put("stacktrace", "");
      Map<String, Object> data = new HashMap<>();
      data.put("value", error);
  
      HttpResponse response = createValidResponse(HTTP_INTERNAL_ERROR, data);
  
      Response decoded = new W3CHttpResponseCodec().decode(response);
  
      assertThat(decoded.getState()).isEqualTo("unsupported operation");
      assertThat(decoded.getStatus().intValue()).isEqualTo(METHOD_NOT_ALLOWED);
  
      assertThat(decoded.getValue()).isInstanceOf(UnsupportedCommandException.class);
      assertThat(((WebDriverException) decoded.getValue()).getMessage()).contains("I like peas");
    }
  
    @Test
    void shouldPopulateTheAlertTextIfThrowingAnUnhandledAlertException() {
      Map<String, Map<String, Serializable>> data =
          ImmutableMap.of(
              "value",
              ImmutableMap.of(
                  "error", "unexpected alert open",
                  "message", "Modal dialog present",
                  "stacktrace", "",
                  "data", ImmutableMap.of("text", "cheese")));
  
      HttpResponse response = createValidResponse(500, data);
      Response decoded = new W3CHttpResponseCodec().decode(response);
  
      UnhandledAlertException ex = (UnhandledAlertException) decoded.getValue();
      assertThat(ex.getAlertText()).isEqualTo("cheese");
    }
  
    private HttpResponse createValidResponse(int statusCode, Map<String, ?> data) {
      byte[] contents = new Json().toJson(data).getBytes(UTF_8);
  
      HttpResponse response = new HttpResponse();
      response.setStatus(statusCode);
      response.addHeader("Content-Type", "application/json; charset=utf-8");
      response.addHeader("Cache-Control", "no-cache");
      response.addHeader("Content-Length", String.valueOf(contents.length));
      response.setContent(bytes(contents));
  
      return response;
    }
  }
  