001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hdfs.web.resources;
019
020import java.io.FileNotFoundException;
021import java.io.IOException;
022
023import javax.servlet.http.HttpServletResponse;
024import javax.ws.rs.core.Context;
025import javax.ws.rs.core.MediaType;
026import javax.ws.rs.core.Response;
027import javax.ws.rs.ext.ExceptionMapper;
028import javax.ws.rs.ext.Provider;
029
030import org.apache.commons.logging.Log;
031import org.apache.commons.logging.LogFactory;
032import org.apache.hadoop.hdfs.web.JsonUtil;
033import org.apache.hadoop.ipc.RemoteException;
034import org.apache.hadoop.security.authorize.AuthorizationException;
035
036import com.sun.jersey.api.ParamException;
037import com.sun.jersey.api.container.ContainerException;
038
039/** Handle exceptions. */
040@Provider
041public class ExceptionHandler implements ExceptionMapper<Exception> {
042  public static final Log LOG = LogFactory.getLog(ExceptionHandler.class);
043
044  private static Exception toCause(Exception e) {
045    final Throwable t = e.getCause();
046    if (t != null && t instanceof Exception) {
047      e = (Exception)e.getCause();
048    }
049    return e;
050  }
051
052  private @Context HttpServletResponse response;
053
054  @Override
055  public Response toResponse(Exception e) {
056    if (LOG.isTraceEnabled()) {
057      LOG.trace("GOT EXCEPITION", e);
058    }
059
060    //clear content type
061    response.setContentType(null);
062
063    //Convert exception
064    if (e instanceof ParamException) {
065      final ParamException paramexception = (ParamException)e;
066      e = new IllegalArgumentException("Invalid value for webhdfs parameter \""
067          + paramexception.getParameterName() + "\": "
068          + e.getCause().getMessage(), e);
069    }
070    if (e instanceof ContainerException) {
071      e = toCause(e);
072    }
073    if (e instanceof RemoteException) {
074      e = ((RemoteException)e).unwrapRemoteException();
075    }
076
077    //Map response status
078    final Response.Status s;
079    if (e instanceof SecurityException) {
080      s = Response.Status.UNAUTHORIZED;
081    } else if (e instanceof AuthorizationException) {
082      s = Response.Status.UNAUTHORIZED;
083    } else if (e instanceof FileNotFoundException) {
084      s = Response.Status.NOT_FOUND;
085    } else if (e instanceof IOException) {
086      s = Response.Status.FORBIDDEN;
087    } else if (e instanceof UnsupportedOperationException) {
088      s = Response.Status.BAD_REQUEST;
089    } else if (e instanceof IllegalArgumentException) {
090      s = Response.Status.BAD_REQUEST;
091    } else {
092      LOG.warn("INTERNAL_SERVER_ERROR", e);
093      s = Response.Status.INTERNAL_SERVER_ERROR;
094    }
095 
096    final String js = JsonUtil.toJsonString(e);
097    return Response.status(s).type(MediaType.APPLICATION_JSON).entity(js).build();
098  }
099}