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.ambari.server.api;
  
  import java.io.IOException;
  import java.lang.reflect.Method;
  
  import jakarta.servlet.RequestDispatcher;
  import jakarta.servlet.ServletException;
  import jakarta.servlet.http.HttpServletRequest;
  import jakarta.servlet.http.HttpServletResponse;
  
  import org.apache.http.HttpStatus;
  import org.eclipse.jetty.server.Request;
  import org.eclipse.jetty.server.handler.ErrorHandler;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javassist.util.proxy.MethodHandler;
  
  /**
   * Wraps the given ErrorHandler to log the error stacks
   */
  public class AmbariViewErrorHandlerProxy extends ErrorHandler implements MethodHandler {
  
    private final static Logger LOGGER = LoggerFactory.getLogger(AmbariViewErrorHandlerProxy.class);
  
    private final ErrorHandler webAppErrorHandler;
    private final AmbariErrorHandler ambariErrorHandler;
  
    public AmbariViewErrorHandlerProxy(ErrorHandler webAppErrorHandler, AmbariErrorHandler ambariErrorHandler) {
      this.webAppErrorHandler = webAppErrorHandler;
      this.ambariErrorHandler = ambariErrorHandler;
    }
  
  
    @Override
    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
  
      if (isInternalError(request, response)) {
        //invoke the ambari error handler
        ambariErrorHandler.handle(target, baseRequest, request, response);
      } else {
        //invoke the original errorhandler
        webAppErrorHandler.handle(target, baseRequest, request, response);
      }
    }
  
    private boolean isInternalError(HttpServletRequest request, HttpServletResponse response) {
      Throwable th = (Throwable) request.getAttribute(RequestDispatcher.ERROR_EXCEPTION);
      return null != th && response.getStatus() == HttpStatus.SC_INTERNAL_SERVER_ERROR;
    }
  
    @Override
    public void setShowStacks(boolean showStacks) {
      ambariErrorHandler.setShowStacks(showStacks);
      webAppErrorHandler.setShowStacks(showStacks);
    }
  
    @Override
    public Object invoke(Object self, Method thisMethod, Method proceed, Object[] args) throws Throwable {
      LOGGER.debug("invoked method: " + thisMethod.getName());
      Method m = findDeclaredMethod(this.getClass(), thisMethod);
      if (m != null) {
        return m.invoke(this, args);
      }
      m = findMethod(webAppErrorHandler.getClass(), thisMethod);
      if (m != null) {
        return m.invoke(webAppErrorHandler, args);
      }
      return null;
    }
  
    private Method findDeclaredMethod(Class<?> clazz, Method method) {
      try {
        return clazz.getDeclaredMethod(method.getName(), method.getParameterTypes());
      } catch (NoSuchMethodException e) {
        return null;
      }
    }
  
    private Method findMethod(Class<?> clazz, Method method) {
      try {
        return clazz.getMethod(method.getName(), method.getParameterTypes());
      } catch (NoSuchMethodException e) {
        return null;
      }
    }
  
  
  }
  