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/*
 * 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.glacier.binders;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import java.io.IOException;

import org.jclouds.glacier.reference.GlacierHeaders;
import org.jclouds.glacier.util.TreeHash;
import org.jclouds.http.HttpException;
import org.jclouds.http.HttpRequest;
import org.jclouds.io.Payload;
import org.jclouds.rest.Binder;

/**
 * Binds the linear hash and the tree hash of payload to the request headers.
 */
public class BindHashesToHeaders implements Binder {

   private HttpRequest addChecksumHeaders(HttpRequest request, Payload payload) {
      try {
         TreeHash hash = TreeHash.buildTreeHashFromPayload(payload);
         request = request.toBuilder()
               .addHeader(GlacierHeaders.LINEAR_HASH, hash.getLinearHash().toString())
               .addHeader(GlacierHeaders.TREE_HASH, hash.getTreeHash().toString())
               .build();
      } catch (IOException e) {
         throw new HttpException("Error hashing the payload", e);
      }
      return request;
   }

   @SuppressWarnings("unchecked")
   @Override
   public  R bindToRequest(R request, Object input) {
      checkArgument(input instanceof Payload, "This binder is only valid for Payload");
      checkNotNull(request, "request");
      Payload payload = Payload.class.cast(input);
      return (R) addChecksumHeaders(request, payload);
   }

}