/**
* Copyright (C) 2011 JTalks.org Team
* 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 org.jtalks.jcommune.plugin.api.web.validation.validators;
import org.jtalks.jcommune.plugin.api.web.validation.annotations.BbCodeNesting;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import org.apache.commons.lang.StringUtils;
import org.kefirsf.bb.BBProcessorFactory;
import org.kefirsf.bb.ConfigurationFactory;
import org.kefirsf.bb.TextProcessor;
import org.kefirsf.bb.TextProcessorNestingException;
import org.kefirsf.bb.conf.Configuration;
/**
* Checked nesting bb code level (maxNestingValue). This is required because our BB-code processor uses recursion for
* parsing and if we have a deep nesting, we'll run into StackOverflow error. Thus before posting something, we check
* whether the nesting of BB-codes is not too deep.
*/
public class BbCodeNestingValidator implements ConstraintValidator<BbCodeNesting, String> {
private static final Logger LOGGER = LoggerFactory.getLogger(BbCodeNestingValidator.class);
private TextProcessor processor;
/**
* {@inheritDoc}
*/
@Override
public void initialize(BbCodeNesting constraintAnnotation) {
Configuration kefirBbConfig = ConfigurationFactory.getInstance().create();
kefirBbConfig.setPropagateNestingException(true);
kefirBbConfig.setNestingLimit(constraintAnnotation.maxNestingValue());
processor = BBProcessorFactory.getInstance().create(kefirBbConfig);
}
/**
* {@inheritDoc}
*/
@Override
public boolean isValid(String value, ConstraintValidatorContext context) {
if (StringUtils.isEmpty(value)) {
return true;
}
try {
processor.process(value);
return true;
} catch (TextProcessorNestingException e) {
LOGGER.warn("Too deep bb-code nesting: " + value);
return false;
}
}
}