net.sourceforge.js3tream.util.Access.java Source code

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Here is the source code for net.sourceforge.js3tream.util.Access.java

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/*******************************************************
 * 
 *  @author spowell
 *  Access.java
 *  Dec 18, 2006
 *  $Id: Access.java,v 1.1 2007/01/05 20:40:07 shaneapowell Exp $
 Copyright (C) 2006  Shane Powell
    
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
    
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.
    
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 ******************************************************/
package net.sourceforge.js3tream.util;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
import java.util.Locale;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

/*******************************************************
 *
 ******************************************************/
public class Access {

    public static final String HMAC_SHA1 = "HmacSHA1";
    public static final String S3SIG_PREFIX = "AmazonS3";

    private static String accessKey_ = null;
    private static String accessSecret_ = null;
    private Date date_ = new Date();

    /** 2005-01-31T23:59:59.183Z */
    private DateFormat calFormat_ = null;

    private Mac mac_ = null;

    /*******************************************************
     * Initialize the Access class with our ID and Key
     * 
     * @param key
     * @param secret
     *******************************************************/
    public static void init(String key, String secret) {
        Access.accessKey_ = key;
        Access.accessSecret_ = secret;
    }

    /*******************************************************
     * @throws Exception
     ******************************************************/
    public Access() throws Exception {
        this.calFormat_ = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
        this.calFormat_.setTimeZone(TimeZone.getTimeZone("GMT"));
        this.mac_ = Mac.getInstance(HMAC_SHA1);
        this.mac_.init(new SecretKeySpec(Access.accessSecret_.getBytes(), HMAC_SHA1));

    }

    /******************************************************
     * @return
     *******************************************************/
    public final String getAccessKey() {
        return Access.accessKey_;
    }

    /********************************************************
     * @return
     *******************************************************/
    public Calendar getAccessCalendar() {
        Calendar cal = Calendar.getInstance();
        cal.setTime(this.date_);
        return cal;
    }

    /********************************************************
     * @param operation
     * @param cal
     * @return
     *******************************************************/
    public String generateSignature(String operation) {

        String sig = S3SIG_PREFIX + operation + calFormat_.format(this.date_);
        byte[] b64 = Base64.encodeBase64(this.mac_.doFinal(sig.getBytes()));
        return new String(b64);

    }

}