[opencms-dev] Removing /opencms by a Filter class (web.xml)

[Peter Birchmeier]

I just tested the Filter class and it works :)

here a slightly modified version:

  private final static String[] EXCLUDES = new String[] {
    "export", "resources", "opencms", "forum"
  };

  public void doFilter(ServletRequest request, ServletResponse response,
      FilterChain chain) throws IOException, ServletException {

    try {
      HttpServletRequest req = (HttpServletRequest) request;
      String uri = req.getRequestURI();

      int pos1 = 1, pos2 = uri.indexOf("/", pos1);
      if ( pos2 != -1 ) {
        String part = uri.substring( pos1, pos2 );

        boolean exclude = false;
        for (int i=0; i<EXCLUDES.length; i++) {
          if (uri.equals(EXCLUDES[i])) {
            exclude = true;
            break;
          }
        }
        if (exclude) {
          chain.doFilter(request, response);
          return;
        }
      }
      String forward = "/opencms" + uri;
      RequestDispatcher dispatcher = request.getRequestDispatcher(forward);
      dispatcher.forward(request, response);
    } catch ( Exception e ) { chain.doFilter(request, response); }

  }



>From: "Peter Birchmeier" <peterbirchmeier at hotmail.com>
>Reply-To: The OpenCms mailing list <opencms-dev at opencms.org>
>To: opencms-dev at opencms.org
>Subject: [opencms-dev] Removing /opencms by a Filter class (web.xml)
>Date: Fri, 23 Sep 2005 00:39:21 +0200
>
>Hi all,
>
>My situation is: I'm using an OpenCms instance on a ISP server, so it's 
>difficult for me to update http.conf-rewrite statements. When I started 
>recently with the installation of jforum which should be included into the 
>same context, I realised that I would have to find another approach to 
>solve the path rewriting issue.
>
>By chance i had the idea to use a Filter class that catches all requests to 
>the tomcat context and "rewrites" the uris by forwarding the requests to 
>other pathes.
>
>Here's a basic example how it would look like:
>
>public class ForwarderFilter implements Filter {
>..
>	public void doFilter(ServletRequest request, ServletResponse response,
>			FilterChain chain) throws IOException, ServletException {
>		try {
>			HttpServletRequest req = (HttpServletRequest) request;
>			String uri = req.getRequestURI(); // e.g. /forum/list.page
>
>			int pos1 = 1, pos2 = uri.indexOf("/", pos1);
>			if ( pos != -1 ) {
>				String part = uri.substring( pos1, pos2 );
>				if ( part.equals( "forum" ) ) {
>					chain.doFilter(request, response);
>					return;
>				}
>			}
>			String forward = "/opencms" + uri;
>			RequestDispatcher dispatcher = request.getRequestDispatcher(forward);
>			dispatcher.forward(request, response);
>		} catch ( Exception e ) { chain.doFilter(request, response); }
>	}
>...
>}
>
>and the web.xml directives:
>	<filter>
>		<filter-name>ForwarderFilter</filter-name>
>		<filter-class>.....ForwarderFilter</filter-class>
>	</filter>
>	<filter-mapping>
>		<filter-name>ForwarderFilter</filter-name>
>		<url-pattern>/*</url-pattern>
>	</filter-mapping>
>
>
>My main question is now: Is this a PERFORMANCE problem?
>I haven't tested this method 100% but it looks promising. At the moment, I 
>go the bidirect way, meaning, Apache is rewriting everything to /opencms, 
>and my ForwarderFilter removes /opencms if necessary...
>If this approach hasn't got significant performance issues, I would greatly 
>prefer it over all others, in my situation of course, due to the fact that 
>I can easily change the filter class and do not have to ask the ISP 
>everytime. Additionally, I would be able to realise a fine grained 
>rewriting (what I couldn't achieve in Apache 1.3)...
>
>Thanks for your opinion,
>regard Peter
>
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