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   1 package org.collectionspace.authentication.spring;
   2
   3 import java.io.IOException;
   4
   5 import javax.servlet.FilterChain;
   6 import javax.servlet.ServletException;
   7 import javax.servlet.http.HttpServletRequest;
   8 import javax.servlet.http.HttpServletResponse;
   9
  10 import org.springframework.security.core.Authentication;
  11 import org.springframework.security.core.context.SecurityContextHolder;
  12 import org.springframework.web.filter.OncePerRequestFilter;
  13
  14 /**
  15  * A filter that sets a request attribute containing the username of the
  16  * authenticated CollectionSpace user. This attribute may then be used
  17  * to log the username via tomcat's standard access log valve.
  18  */
  19 public class CSpaceUserAttributeFilter extends OncePerRequestFilter {
  20     public static final String ATTRIBUTE_NAME = "org.collectionspace.authentication.user";
  21
  22     @Override
  23     protected void doFilterInternal(HttpServletRequest request,
  24             HttpServletResponse response, FilterChain chain)
  25             throws ServletException, IOException {
  26         chain.doFilter(request, response);
  27
  28         Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
  29
  30         if (authentication != null) {
  31             request.setAttribute(ATTRIBUTE_NAME, authentication.getName());
  32         }
  33     }
  34 }