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1 /*
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2 Copyright (c) 2008 Franklin Schmidt <fschmidt@gmail.com>
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3
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4 Permission is hereby granted, free of charge, to any person obtaining a copy
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5 of this software and associated documentation files (the "Software"), to deal
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6 in the Software without restriction, including without limitation the rights
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7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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8 copies of the Software, and to permit persons to whom the Software is
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9 furnished to do so, subject to the following conditions:
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10
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11 The above copyright notice and this permission notice shall be included in
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12 all copies or substantial portions of the Software.
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13
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14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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20 THE SOFTWARE.
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21 */
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22
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23 package fschmidt.util.servlet;
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24
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25 import java.io.*;
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26 import java.util.regex.*;
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27 import javax.servlet.*;
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28 import javax.servlet.http.*;
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29 import fschmidt.util.servlet.*;
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30
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31
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32 public final class RedirectServlet extends HttpServlet {
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33 private Pattern regex;
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34 private String subst;
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35 private int group = 1;
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36
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37 public void init(ServletConfig config)
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38 throws ServletException
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39 {
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40 super.init(config);
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41 regex = Pattern.compile( config.getInitParameter("regex") );
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42 subst = config.getInitParameter("subst");
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43 }
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44
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45 protected void service(HttpServletRequest request,HttpServletResponse response)
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46 throws ServletException, IOException
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47 {
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48 String url = ServletUtils.getCurrentURL(request);
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49 Matcher m = regex.matcher(url);
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50 if( !m.find() )
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51 throw new RuntimeException(url);
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52 url = url.substring(0,m.start(group)) + subst + url.substring(m.end(group));
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53 //log.info(url);
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54 response.sendRedirect(url);
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55 }
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56 }
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