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jclouds components to access blobstore
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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.blobstore;

import com.google.common.annotations.Beta;
import org.jclouds.blobstore.domain.Blob;
import org.jclouds.blobstore.internal.RequestSigningUnsupported;
import org.jclouds.blobstore.options.GetOptions;
import org.jclouds.http.HttpRequest;

import com.google.inject.ImplementedBy;

/**
 * Generates signed requests for blobs. useful in other tools such as backup utilities.
 */
@ImplementedBy(RequestSigningUnsupported.class)
public interface BlobRequestSigner {

   /**
    * gets a signed request, including headers as necessary, to access a blob from an external
    * client.
    * 
    * @param container
    *           container where the blob resides
    * @param directory
    *           full path to the blob
    * @throws UnsupportedOperationException
    *            if not supported by the provider
    */
   HttpRequest signGetBlob(String container, String name);

   /**
    * gets a signed request, including headers as necessary, to allow access to a blob
    * from an external client for a limited period of time
    *
    * @param timeInSeconds
    *           validity time in seconds for the generated request
    * @see #signGetBlob(String, String)
    */
   @Beta
   HttpRequest signGetBlob(String container, String name, long timeInSeconds);

   /**
    * @param options
    * @see #signGetBlob(String, String)
    */
   HttpRequest signGetBlob(String container, String name, GetOptions options);

   /**
    * gets a signed request, including headers as necessary, to upload a blob from an external
    * client.
    * 
    *     * Blob blob = context.getBlobStore.blobBuilder().name("name").forSigning().contentType("text/plain")
    *          .contentLength(length).build();
    * 
    * 
    * @param container
    *           container where the blob resides
    * @param blob
    *           what to upload
    * @throws UnsupportedOperationException
    *            if not supported by the provider
    * @see BlobBuilder#forSigning
    */
   HttpRequest signPutBlob(String container, Blob blob);

   /**
    * gets a signed request, including headers as necessary, to upload a blob from an
    * external client for a limited period of time
    *
    * @param timeInSeconds
    *           validity time in seconds for the generated request
    * @see BlobBuilder#forSigning
    * @see BlobRequestSigner#signPutBlob
    */
   @Beta
   HttpRequest signPutBlob(String container, Blob blob, long timeInSeconds);
}