/*
* eGov suite of products aim to improve the internal efficiency,transparency,
* accountability and the service delivery of the government organizations.
*
* Copyright (C) <2015> eGovernments Foundation
*
* The updated version of eGov suite of products as by eGovernments Foundation
* is available at http://www.egovernments.org
*
* 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, either version 3 of the License, or
* any later version.
*
* This program 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/ or
* http://www.gnu.org/licenses/gpl.html .
*
* In addition to the terms of the GPL license to be adhered to in using this
* program, the following additional terms are to be complied with:
*
* 1) All versions of this program, verbatim or modified must carry this
* Legal Notice.
*
* 2) Any misrepresentation of the origin of the material is prohibited. It
* is required that all modified versions of this material be marked in
* reasonable ways as different from the original version.
*
* 3) This license does not grant any rights to any user of the program
* with regards to rights under trademark law for use of the trade names
* or trademarks of eGovernments Foundation.
*
* In case of any queries, you can reach eGovernments Foundation at contact@egovernments.org.
*/
package org.egov.infra.security.utils;
import org.egov.infra.exception.ApplicationRuntimeException;
import org.owasp.validator.html.AntiSamy;
import org.owasp.validator.html.CleanResults;
import org.owasp.validator.html.Policy;
import org.owasp.validator.html.PolicyException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.commons.lang.StringUtils.isBlank;
/**
* VirtualSanitizer.java This class used to sanitise user input from possible XSS attacks.
**/
public final class VirtualSanitizer {
private static final Logger LOG = LoggerFactory.getLogger(VirtualSanitizer.class);
private static Policy policy;
private static AntiSamy antiSamy;
private static AntiSamy getAntiSamy() throws PolicyException {
if (antiSamy == null) {
policy = getPolicy("antisamy-myspace-1.4.3.xml");
antiSamy = new AntiSamy();
}
return antiSamy;
}
private static Policy getPolicy(final String name) throws PolicyException {
final Policy policy = Policy.getInstance(VirtualSanitizer.class.getResource(name));
return policy;
}
public static String sanitize(final String input) {
try {
if (isBlank(input)) {
return input;
}
final CleanResults cr = getAntiSamy().scan(input, policy);
if (cr.getErrorMessages().size() > 0) {
LOG.error(cr.getErrorMessages().toString());
throw new ApplicationRuntimeException("Found security threat in user input : " + cr.getErrorMessages());
}
return input;
} catch (final Exception e) {
LOG.error(e.getMessage());
throw new ApplicationRuntimeException("Error occurred while validating inputs", e);
}
}
}