ru.org.linux.csrf.CSRFHandlerInterceptor.java Source code

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Here is the source code for ru.org.linux.csrf.CSRFHandlerInterceptor.java

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/*
 * Copyright 1998-2012 Linux.org.ru
 *    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 ru.org.linux.csrf;

import com.google.common.base.Strings;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import ru.org.linux.auth.AccessViolationException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CSRFHandlerInterceptor extends HandlerInterceptorAdapter {
    private static final Log logger = LogFactory.getLog(CSRFHandlerInterceptor.class);

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        if (!request.getMethod().equalsIgnoreCase("POST")) {
            // Not a POST - allow the request
            return true;
        } else {
            // This is a POST request - need to check the CSRF token
            //CSRFProtectionService.checkCSRF(request);

            if ((handler instanceof HandlerMethod)
                    && (((HandlerMethod) handler).getMethodAnnotation(CSRFNoAuto.class) != null)) {
                logger.debug("Auto CSRF disabled for " + ((HandlerMethod) handler).getBeanType().getName());
                return true;
            }

            String csrfInput = request.getParameter(CSRFProtectionService.CSRF_INPUT_NAME);

            if (Strings.isNullOrEmpty(csrfInput)) {
                if ((handler instanceof HandlerMethod)) {
                    logger.warn("Missing CSRF field for " + request.getRequestURI() + ' '
                            + ((HandlerMethod) handler).getBeanType().getName() + '.'
                            + ((HandlerMethod) handler).getMethod().getName());
                } else {
                    logger.warn("Missing CSRF field for " + request.getRequestURI());
                }
            }

            if (!CSRFProtectionService.checkCSRF(request)) {
                throw new AccessViolationException(
                        "?   CSRF.  ???? ?");
            }

            return true;
        }
    }
}