content: /*
   * Copyright (C) 2018 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
   *
   *      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 com.alibaba.codeless.framework.web;
  
  import com.alibaba.codeless.framework.core.utils.JsonUtils;
  import com.alibaba.codeless.framework.core.utils.StringUtils;
  import org.springframework.context.MessageSource;
  import org.springframework.context.NoSuchMessageException;
  import org.springframework.core.MethodParameter;
  import org.springframework.http.server.ServletServerHttpResponse;
  import org.springframework.web.context.request.NativeWebRequest;
  import org.springframework.web.context.request.RequestAttributes;
  import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
  import org.springframework.web.method.support.ModelAndViewContainer;
  import org.springframework.web.servlet.i18n.SessionLocaleResolver;
  
  import javax.servlet.http.HttpServletResponse;
  import java.util.Locale;
  
  /**
   * @author xiaolongzuo
   */
  public class JsonHandlerMethodReturnValueHandler implements HandlerMethodReturnValueHandler {
  
      private static final String CONTENT_TYPE = "application/json;charset=utf-8";
  
      private static final String DEFAULT_SUCCESS_CODE = "YA-200";
  
      private MessageSource messageSource;
  
      public JsonHandlerMethodReturnValueHandler(MessageSource messageSource) {
          this.messageSource = messageSource;
      }
  
      @Override
      public boolean supportsReturnType(MethodParameter returnType) {
          return true;
      }
  
      @Override
      public void handleReturnValue(Object returnValue, MethodParameter returnType, ModelAndViewContainer mavContainer,
                                    NativeWebRequest webRequest) throws Exception {
          mavContainer.setRequestHandled(true);
          HttpServletResponse httpServletResponse = webRequest.getNativeResponse(HttpServletResponse.class);
          httpServletResponse.setContentType(CONTENT_TYPE);
          ServletServerHttpResponse outputMessage = new ServletServerHttpResponse(httpServletResponse);
          Locale locale = (Locale)webRequest.getAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME,
              RequestAttributes.SCOPE_SESSION);
          String message;
          try {
              message = messageSource.getMessage(DEFAULT_SUCCESS_CODE, new Object[0], locale);
          } catch (NoSuchMessageException e) {
              message = DefaultMessagesProperties.getMessage(DEFAULT_SUCCESS_CODE);
          }
          JsonResponse jsonResponse = new JsonResponse(DEFAULT_SUCCESS_CODE, message, returnValue);
          outputMessage.getBody().write(StringUtils.toBytes(JsonUtils.toJson(jsonResponse)));
          outputMessage.getBody().flush();
      }
  
  }
  