org.apereo.openlrs.XAPIHeaderFilter.java Source code

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Here is the source code for org.apereo.openlrs.XAPIHeaderFilter.java

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/**
 * Copyright 2014 Unicon (R) Licensed under the
 * Educational Community 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.osedu.org/licenses/ECL-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.apereo.openlrs;

import java.io.IOException;

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

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

/**
 * @author ggilbert
 *
 */
@Component
public class XAPIHeaderFilter extends OncePerRequestFilter {

    @Value("${xapi.version}")
    private String version;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
            FilterChain filterChain) throws ServletException, IOException {

        String allowedRequestHeaders = request.getHeader("Access-Control-Request-Headers");
        String responseHeader = Constants.XAPI_VERSION_HEADER;

        if (StringUtils.isNotBlank(allowedRequestHeaders)) {
            if (StringUtils.contains(allowedRequestHeaders, Constants.XAPI_VERSION_HEADER.toLowerCase())) {
                responseHeader = responseHeader.toLowerCase();
            }
        }

        response.addHeader(responseHeader, version);
        filterChain.doFilter(request, response);
    }

}