openstack-glance/src/main/java/org/jclouds/openstack/glance/v1_0/handlers/GlanceErrorHandler.java

/*
 * 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.jclouds.openstack.glance.v1_0.handlers;

import static org.jclouds.http.HttpUtils.closeClientButKeepContentStream;

import javax.inject.Singleton;

import org.jclouds.http.HttpCommand;
import org.jclouds.http.HttpErrorHandler;
import org.jclouds.http.HttpResponse;
import org.jclouds.http.HttpResponseException;
import org.jclouds.openstack.glance.functions.RegionToEndpointNegotiateVersion;
import org.jclouds.rest.AuthorizationException;
import org.jclouds.rest.ResourceNotFoundException;

/**
 * This will parse and set an appropriate exception on the command object.
 */
// TODO: is there error spec someplace? let's type errors, etc.
@Singleton
public class GlanceErrorHandler implements HttpErrorHandler {
   public void handleError(HttpCommand command, HttpResponse response) {
      // it is important to always read fully and close streams
      byte[] data = closeClientButKeepContentStream(response);
      String message = data != null ? new String(data) : null;

      Exception exception = message != null ? new HttpResponseException(command, response, message)
               : new HttpResponseException(command, response);
      message = message != null ? message : String.format("%s -> %s", command.getCurrentRequest().getRequestLine(),
               response.getStatusLine());
      switch (response.getStatusCode()) {
         // do not throw exceptions on Glance version negotiation
         case 300:
            if (command.getCurrentRequest().getFirstHeaderOrNull(RegionToEndpointNegotiateVersion.VERSION_NEGOTIATION_HEADER) != null) {
               return;
            }
            break;
         case 400:
            break;
         case 401:
         case 403:
            exception = new AuthorizationException(message, exception);
            break;
         case 404:
            if (!command.getCurrentRequest().getMethod().equals("DELETE")) {
               exception = new ResourceNotFoundException(message, exception);
            }
            break;
      }
      command.setException(exception);
   }
}