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jclouds Core components to access OpenStack apis
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/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds 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.functions;

import static com.google.common.base.Preconditions.checkNotNull;
import static org.jclouds.http.HttpUtils.releasePayload;
import static org.jclouds.http.Uris.uriBuilder;
import static org.jclouds.openstack.reference.AuthHeaders.AUTH_TOKEN;
import static org.jclouds.openstack.reference.AuthHeaders.URL_SUFFIX;

import java.net.URI;
import java.util.Map.Entry;

import javax.annotation.Resource;

import org.jclouds.http.HttpRequest;
import org.jclouds.http.HttpResponse;
import org.jclouds.logging.Logger;
import org.jclouds.openstack.domain.AuthenticationResponse;
import org.jclouds.rest.InvocationContext;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMap.Builder;

/**
 * This parses {@link AuthenticationResponse} from HTTP headers.
 * 
 * @author Adrian Cole
 */
public class ParseAuthenticationResponseFromHeaders implements Function,
         InvocationContext {

   @Resource
   protected Logger logger = Logger.NULL;

   private String hostToReplace;

   /**
    * parses the http response headers to create a new {@link AuthenticationResponse} object.
    */
   public AuthenticationResponse apply(HttpResponse from) {
      releasePayload(from);
      Builder builder = ImmutableMap.builder();
      for (Entry entry : from.getHeaders().entries()) {
         if (entry.getKey().endsWith(URL_SUFFIX))
            builder.put(entry.getKey(), getURI(entry.getValue()));
      }
      AuthenticationResponse response = new AuthenticationResponse(checkNotNull(from.getFirstHeaderOrNull(AUTH_TOKEN),
               AUTH_TOKEN), builder.build());
      logger.debug("will connect to: ", response);
      return response;
   }

   // TODO: find the swift configuration or bug related to returning localhost
   protected URI getURI(String headerValue) {
      if (headerValue == null)
         return null;
      URI toReturn = URI.create(headerValue);
      if (!"127.0.0.1".equals(toReturn.getHost()))
         return toReturn;
      return uriBuilder(toReturn).host(hostToReplace).build();
   }

   @Override
   public ParseAuthenticationResponseFromHeaders setContext(HttpRequest request) {
      String host = request.getEndpoint().getHost();
      return setHostToReplace(host);
   }

   @VisibleForTesting
   ParseAuthenticationResponseFromHeaders setHostToReplace(String hostToReplace) {
      this.hostToReplace = hostToReplace;
      return this;
   }
}