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| 1 | +/******************************************************************************* |
| 2 | + * Copyright (c) 2015 Eclipse RDF4J contributors, Aduna, and others. |
| 3 | + * |
| 4 | + * All rights reserved. This program and the accompanying materials |
| 5 | + * are made available under the terms of the Eclipse Distribution License v1.0 |
| 6 | + * which accompanies this distribution, and is available at |
| 7 | + * http://www.eclipse.org/org/documents/edl-v10.php. |
| 8 | + * |
| 9 | + * SPDX-License-Identifier: BSD-3-Clause |
| 10 | + *******************************************************************************/ |
| 11 | +package org.eclipse.rdf4j.common.webapp.filters; |
| 12 | + |
| 13 | +import java.io.CharArrayWriter; |
| 14 | +import java.io.IOException; |
| 15 | +import java.io.PrintWriter; |
| 16 | + |
| 17 | +import javax.servlet.Filter; |
| 18 | +import javax.servlet.FilterChain; |
| 19 | +import javax.servlet.FilterConfig; |
| 20 | +import javax.servlet.ServletException; |
| 21 | +import javax.servlet.ServletRequest; |
| 22 | +import javax.servlet.ServletResponse; |
| 23 | +import javax.servlet.http.HttpServletRequest; |
| 24 | +import javax.servlet.http.HttpServletResponse; |
| 25 | +import javax.servlet.http.HttpServletResponseWrapper; |
| 26 | + |
| 27 | +/** |
| 28 | + * @author Herko ter Horst |
| 29 | + */ |
| 30 | +public class PathFilter implements Filter { |
| 31 | + |
| 32 | + @Override |
| 33 | + public void init(FilterConfig filterConf) throws ServletException { |
| 34 | + // do nothing |
| 35 | + } |
| 36 | + |
| 37 | + @Override |
| 38 | + public void destroy() { |
| 39 | + // do nothing |
| 40 | + } |
| 41 | + |
| 42 | + @Override |
| 43 | + public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain) |
| 44 | + throws IOException, ServletException { |
| 45 | + if (req instanceof HttpServletRequest) { |
| 46 | + HttpServletRequest request = (HttpServletRequest) req; |
| 47 | + HttpServletResponse response = (HttpServletResponse) res; |
| 48 | + String path = request.getContextPath(); |
| 49 | + |
| 50 | + PrintWriter out = response.getWriter(); |
| 51 | + CharResponseWrapper wrapper = new CharResponseWrapper((HttpServletResponse) response); |
| 52 | + filterChain.doFilter(request, wrapper); |
| 53 | + CharArrayWriter caw = new CharArrayWriter(); |
| 54 | + caw.write(wrapper.toString().replace("${path}", path)); |
| 55 | + String result = caw.toString(); |
| 56 | + response.setContentLength(result.length()); |
| 57 | + out.write(result); |
| 58 | + } |
| 59 | + } |
| 60 | + |
| 61 | + private static class CharResponseWrapper extends HttpServletResponseWrapper { |
| 62 | + |
| 63 | + private final CharArrayWriter output; |
| 64 | + |
| 65 | + @Override |
| 66 | + public String toString() { |
| 67 | + return output.toString(); |
| 68 | + } |
| 69 | + |
| 70 | + public CharResponseWrapper(HttpServletResponse response) { |
| 71 | + super(response); |
| 72 | + output = new CharArrayWriter(); |
| 73 | + } |
| 74 | + |
| 75 | + @Override |
| 76 | + public PrintWriter getWriter() { |
| 77 | + return new PrintWriter(output); |
| 78 | + } |
| 79 | + } |
| 80 | +} |
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