/*
* Copyright 2014 Allan Ditzel
*
* 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 com.allanditzel.springframework.security.web.csrf;
import org.springframework.security.web.csrf.CsrfToken;
import org.springframework.web.filter.OncePerRequestFilter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* Binds a {@link org.springframework.security.web.csrf.CsrfToken} to the {@link HttpServletResponse}
* headers if the Spring {@link org.springframework.security.web.csrf.CsrfFilter} has placed one in the {@link HttpServletRequest}.
*
* Based on the work found in: <a href="http://stackoverflow.com/questions/20862299/with-spring-security-3-2-0-release-how-can-i-get-the-csrf-token-in-a-page-that">Stack Overflow</a>
*
* @author Allan Ditzel
* @since 1.0
*/
public class CsrfTokenResponseHeaderBindingFilter extends OncePerRequestFilter {
protected static final String REQUEST_ATTRIBUTE_NAME = "_csrf";
protected static final String RESPONSE_HEADER_NAME = "X-CSRF-HEADER";
protected static final String RESPONSE_PARAM_NAME = "X-CSRF-PARAM";
protected static final String RESPONSE_TOKEN_NAME = "X-CSRF-TOKEN";
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, javax.servlet.FilterChain filterChain) throws ServletException, IOException {
CsrfToken token = (CsrfToken) request.getAttribute(REQUEST_ATTRIBUTE_NAME);
if (token != null) {
response.setHeader(RESPONSE_HEADER_NAME, token.getHeaderName());
response.setHeader(RESPONSE_PARAM_NAME, token.getParameterName());
response.setHeader(RESPONSE_TOKEN_NAME , token.getToken());
}
filterChain.doFilter(request, response);
}
}