/*******************************************************************************
*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.util.Map;
import java.util.List;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.MalformedURLException;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.HttpException;
import edu.ucsb.eucalyptus.admin.server.EucalyptusWebBackendImpl;
import edu.ucsb.eucalyptus.admin.client.UserInfoWeb;
import edu.ucsb.eucalyptus.admin.client.extensions.store.ImageStoreService;
public class ImageStoreServiceImpl extends RemoteServiceServlet
implements ImageStoreService {
/* These are fixed: */
private final static String API_VERSION = "2009-10-01";
private final static String SIGNATURE_VERSION = "2";
private final static String SIGNATURE_METHOD = "HmacSHA256";
private final static int EXPIRES_DELAY_SECONDS = 30;
public String requestJSON(String sessionId, Method method, String uri,
Parameter[] params) {
UserInfoWeb user;
try {
user = EucalyptusWebBackendImpl.getUserRecord (sessionId);
} catch (Exception e) {
return errorJSON("Session authentication error: " + e.getMessage());
}
NameValuePair[] finalParams;
try {
finalParams = getFinalParameters(method, uri, params, user);
} catch (MalformedURLException e) {
return errorJSON("Malformed URL: " + uri);
}
HttpClient client = new HttpClient();
HttpMethod httpMethod;
if (method == Method.GET) {
GetMethod getMethod = new GetMethod(uri);
httpMethod = getMethod;
getMethod.setQueryString(finalParams);
} else if (method == Method.POST) {
PostMethod postMethod = new PostMethod(uri);
httpMethod = postMethod;
postMethod.addParameters(finalParams);
} else {
throw new UnsupportedOperationException("Unknown method");
}
try {
int statusCode = client.executeMethod(httpMethod);
String str = "";
InputStream in = httpMethod.getResponseBodyAsStream();
byte[] readBytes = new byte[1024];
int bytesRead = -1;
while((bytesRead = in.read(readBytes)) > 0) {
str += new String(readBytes, 0, bytesRead);
}
return str;
} catch (HttpException e) {
return errorJSON("Protocol error: " + e.getMessage());
} catch (IOException e) {
return errorJSON("Proxy error: " + e.getMessage());
} finally {
httpMethod.releaseConnection();
}
}
private String errorJSON(String errorMessage) {
return "{\"error-message\": \"" + escapeString(errorMessage) + "\"}";
}
private String escapeString(String value) {
return value.replace("\\", "\\\\")
.replace("\"", "\\\"")
.replace("\b", "\\b")
.replace("\f", "\\f")
.replace("\n", "\\n")
.replace("\r", "\\r")
.replace("\t", "\\t");
}
private NameValuePair[] getFinalParameters(Method method, String uri,
Parameter[] params, UserInfoWeb user)
throws MalformedURLException {
if (params == null) {
// Simplify the logic below.
params = new Parameter[0];
}
URL url = new URL(uri);
SignatureGenerator signatureGenerator =
new SignatureGenerator(method.toString(), url.getHost(),
url.getPort(), url.getPath());
Parameter[] finalParams = new Parameter[params.length + 7];
System.arraycopy(params, 0, finalParams, 0, params.length);
int i = params.length;
finalParams[i++] = new Parameter("SignatureMethod", SIGNATURE_METHOD);
finalParams[i++] = new Parameter("SignatureVersion", SIGNATURE_VERSION);
finalParams[i++] = new Parameter("Version", API_VERSION);
finalParams[i++] = new Parameter("ClientId", user.getQueryId());
finalParams[i++] = new Parameter("Expires",
new Long(
(System.currentTimeMillis() / 1000)
+ EXPIRES_DELAY_SECONDS
).toString());
finalParams[i++] = new Parameter("Nonce",
new Long(System.nanoTime()).toString());
for (Parameter param : finalParams) {
if (param != null) {
signatureGenerator.addParameter(param.getName(),
param.getValue());
}
}
String signature = signatureGenerator.getSignature(user.getSecretKey());
finalParams[i++] = new Parameter("Signature", signature);
return getNameValuePairs(finalParams);
}
private NameValuePair[] getNameValuePairs(Parameter[] params) {
NameValuePair[] pairs = new NameValuePair[params.length];
for (int i = 0; i != params.length; i++) {
pairs[i] = new NameValuePair(params[i].getName(),
params[i].getValue());
}
return pairs;
}
}