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 /*
  * Copyright 2012-2015 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;
Implementation of AbstractAWSSigner for Amazon CloudFront's authentication scheme.
public class CloudFrontSigner extends AbstractAWSSigner {

    
Shared log for signing debug output
    private static final Log log = LogFactory.getLog(CloudFrontSigner.class);
    @Override
    public void sign(SignableRequest<?> requestAWSCredentials credentialsthrows AmazonClientException {
        AWSCredentials sanitizedCredentials = sanitizeCredentials(credentials);
        if ( sanitizedCredentials instanceof AWSSessionCredentials ) {
            addSessionCredentials(request, (AWSSessionCredentialssanitizedCredentials);
        }
        String date = new DateUtils().formatRfc822Date(new Date());
        request.addHeader("Date"date);
        String canonicalString = date;
        .debug("Calculated string to sign:\n\"" + canonicalString + "\"");
        String signature = super.signAndBase64Encode(canonicalStringsanitizedCredentials.getAWSSecretKey(), .);
        request.addHeader("Authorization""AWS " + sanitizedCredentials.getAWSAccessKeyId() + ":" + signature);
    }
    @Override
    protected void addSessionCredentials(SignableRequest<?> requestAWSSessionCredentials credentials) {
        request.addHeader("x-amz-security-token"credentials.getSessionToken());
    }
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