/*******************************************************************************
*Copyright (c) 2009 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, only version 3 of the License.
*
*
* This file 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 General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Please contact Eucalyptus Systems, Inc., 130 Castilian
* Dr., Goleta, CA 93101 USA or visit <http://www.eucalyptus.com/licenses/>
* if you need additional information or have any questions.
*
* This file may incorporate work covered under the following copyright and
* permission notice:
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Regents of the University of California
* All rights reserved.
*
* Redistribution and use of this software in source and binary forms, with
* or without modification, are permitted provided that the following
* conditions are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. USERS OF
* THIS SOFTWARE ACKNOWLEDGE THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE
* LICENSED MATERIAL, COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS
* SOFTWARE, AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
* IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA, SANTA
* BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY, WHICH IN
* THE REGENTS’ DISCRETION MAY INCLUDE, WITHOUT LIMITATION, REPLACEMENT
* OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO IDENTIFIED, OR
* WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT NEEDED TO COMPLY WITH
* ANY SUCH LICENSES OR RIGHTS.
*******************************************************************************/
package edu.ucsb.eucalyptus.admin.server.extensions.store;
import java.io.UnsupportedEncodingException;
import java.util.Collections;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.TreeMap;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.InvalidKeyException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
public class SignatureGenerator {
private final TreeMap<String,List<String>> parameters = new TreeMap<String,List<String>>();
private final String method;
private final String host;
private final String path;
private final String ALGORITHM = "HMacSHA256";
public SignatureGenerator(String method, String host, int port, String path) {
this.method = method.toUpperCase();
if (port == 80) {
this.host = host.toLowerCase();
} else {
this.host = host.toLowerCase() + ":" + port;
}
this.path = path;
}
public void addParameter(String name, String value) {
List<String> values = parameters.get(name);
if (values == null) {
values = new ArrayList<String>();
parameters.put(name, values);
}
values.add(value);
}
public String getSignature(String secretKey) {
Mac mac;
try {
mac = Mac.getInstance(ALGORITHM);
mac.init(new SecretKeySpec(secretKey.getBytes(), ALGORITHM));
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
}
mac.update(method.getBytes());
mac.update((byte)'\n');
mac.update(host.getBytes());
mac.update((byte)'\n');
mac.update(path.getBytes());
mac.update((byte)'\n');
boolean addAmpersand = false;
for (Map.Entry<String,List<String>> entry : parameters.entrySet()) {
byte[] nameBytes = encodeString(entry.getKey());
List<String> values = entry.getValue();
Collections.sort(values);
for (String value : values) {
if (addAmpersand) {
mac.update((byte)'&');
} else {
addAmpersand = true;
}
byte[] valueBytes = encodeString(value);
mac.update(nameBytes);
mac.update((byte)'=');
mac.update(valueBytes);
}
}
byte[] digest = mac.doFinal();
return new String(Base64.encodeBase64(digest));
}
private final static String RFC3986_UNRESERVED =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
"abcdefghijklmnopqrstuvwxyz" +
"01234567890-_.~";
private final static char[] HEX_MAP = {'0','1','2','3','4','5','6','7',
'8','9','A','B','C','D','E','F'};
private byte[] encodeString(String value) {
// Will be at most six times as large (U => %AB%CD,
// where U is a unicode character).
byte[] valueBytes;
try {
valueBytes = value.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
byte[] result = new byte[valueBytes.length * 6];
int i = 0;
for (byte c : valueBytes) {
if (RFC3986_UNRESERVED.indexOf(c) != -1) {
result[i++] = c;
} else {
result[i++] = (byte)'%';
result[i++] = (byte)HEX_MAP[(c & 0xf0) >>> 4];
result[i++] = (byte)HEX_MAP[(c & 0x0f)];
}
}
byte[] trimmedResult = new byte[i];
System.arraycopy(result, 0, trimmedResult, 0, i);
return trimmedResult;
}
}