org.b3log.symphony.processor.advice.CSRFCheck.java Source code

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Here is the source code for org.b3log.symphony.processor.advice.CSRFCheck.java

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/*
 * Copyright (c) 2012-2016, b3log.org & hacpai.com & fangstar.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.b3log.symphony.processor.advice;

import java.util.Map;
import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.lang.StringUtils;
import org.b3log.latke.Keys;
import org.b3log.latke.Latkes;
import org.b3log.latke.logging.Logger;
import org.b3log.latke.service.LangPropsService;
import org.b3log.latke.servlet.HTTPRequestContext;
import org.b3log.latke.servlet.advice.BeforeRequestProcessAdvice;
import org.b3log.latke.servlet.advice.RequestProcessAdviceException;
import org.b3log.symphony.model.Common;
import org.b3log.symphony.util.Sessions;
import org.json.JSONObject;

/**
 * CSRF check.
 *
 * @author <a href="http://88250.b3log.org">Liang Ding</a>
 * @version 1.0.0.2, Apr 19, 2016
 * @since 1.3.0
 */
@Named
@Singleton
public class CSRFCheck extends BeforeRequestProcessAdvice {

    /**
     * Logger.
     */
    private static final Logger LOGGER = Logger.getLogger(CSRFCheck.class.getName());

    /**
     * Language service.
     */
    @Inject
    private LangPropsService langPropsService;

    @Override
    public void doAdvice(final HTTPRequestContext context, final Map<String, Object> args)
            throws RequestProcessAdviceException {
        final HttpServletRequest request = context.getRequest();

        final JSONObject exception = new JSONObject();
        exception.put(Keys.MSG, langPropsService.get("csrfCheckFailedLabel"));
        exception.put(Keys.STATUS_CODE, false);

        // 1. Check Referer
        final String referer = request.getHeader("Referer");
        if (!StringUtils.startsWith(referer, Latkes.getServePath())) {
            throw new RequestProcessAdviceException(exception);
        }

        // 2. Check Token
        final String clientToken = request.getHeader(Common.CSRF_TOKEN);
        final String serverToken = Sessions.getCSRFToken(request);

        if (!StringUtils.equals(clientToken, serverToken)) {
            throw new RequestProcessAdviceException(exception);
        }
    }
}