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/*
 * Copyright 2010-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 com.amazonaws.auth;

import java.util.Date;

import com.amazonaws.Request;

/**
 * A request signer that has special-case logic to presign requests, generating
 * a URL which embeds the signature suitable for hyperlinking.
 */
public interface Presigner {
    /**
     * Signs the request by adding the signature to the URL rather than as a
     * header. This method is expected to modify the passed-in request to
     * add the signature.
     *
     * @param request      The request to sign.
     * @param credentials  The credentials to sign it with.
     * @param expiration   The time when this presigned URL will expire.
     */
    public void presignRequest(Request request,
                               AWSCredentials credentials,
                               Date expiration);
}