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The Amazon Web Services SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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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.services.s3.internal;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.amazonaws.http.HttpResponse;
import com.amazonaws.services.s3.Headers;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Header handler to pull the EXPIRATION header out of the response.
 */
public class ObjectExpirationHeaderHandler
        implements HeaderHandler {

    /*
     * expiry-date="Sun, 11 Dec 2012 00:00:00 GMT", rule-id="baz rule"
     */

    private static final Pattern datePattern =
        Pattern.compile("expiry-date=\"(.*?)\"");
    private static final Pattern rulePattern =
        Pattern.compile("rule-id=\"(.*?)\"");

    private static final Log log =
        LogFactory.getLog(ObjectExpirationHeaderHandler.class);

    /*
     * (non-Javadoc)
     * 
     * @see
     * com.amazonaws.services.s3.internal.HeaderHandler#handle(java.lang.Object,
     * com.amazonaws.http.HttpResponse)
     */
    @Override
    public void handle(T result, HttpResponse response) {
        String expirationHeader =
            response.getHeaders().get(Headers.EXPIRATION);

        if ( expirationHeader != null ) {
            result.setExpirationTime(parseDate(expirationHeader));
            result.setExpirationTimeRuleId(parseRuleId(expirationHeader));
        }
    }

    private String parseRuleId(String expirationHeader) {
        Matcher matcher = rulePattern.matcher(expirationHeader);
        if ( matcher.find() ) {
            return matcher.group(1);
        }
        return null;
    }

    private Date parseDate(String expirationHeader) {
        Matcher matcher = datePattern.matcher(expirationHeader);
        if ( matcher.find() ) {
            String date = matcher.group(1);
            try {
                return ServiceUtils.parseRfc822Date(date);
            } catch (ParseException exception) {
                log.warn("Error parsing expiry-date from x-amz-expiration "
                         + "header.",
                         exception);
            }
        }

        return null;
    }
}