01: /*
02: * <copyright>
03: *
04: * Copyright 2000-2004 BBNT Solutions, LLC
05: * under sponsorship of the Defense Advanced Research Projects
06: * Agency (DARPA).
07: *
08: * You can redistribute this software and/or modify it under the
09: * terms of the Cougaar Open Source License as published on the
10: * Cougaar Open Source Website (www.cougaar.org).
11: *
12: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
13: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
14: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
15: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
16: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
17: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
18: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
22: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23: *
24: * </copyright>
25: */
26:
27: package org.cougaar.lib.web.service;
28:
29: import java.io.IOException;
30: import java.io.PrintWriter;
31:
32: import javax.servlet.Servlet;
33: import javax.servlet.ServletConfig;
34: import javax.servlet.ServletException;
35: import javax.servlet.ServletRequest;
36: import javax.servlet.ServletResponse;
37: import javax.servlet.http.HttpServletRequest;
38: import javax.servlet.http.HttpServletResponse;
39:
40: import org.cougaar.core.servlet.ComponentServlet;
41:
42: /**
43: * This servlet handles "/robots.txt" requests with a hard-coded disallow
44: * response:<tt><pre>
45: * User-agent: *
46: * Disallow: /
47: * </pre></tt>to keep out web-crawlers, such as Google.
48: */
49: public class BlockRobotsServlet extends ComponentServlet {
50:
51: protected String getPath() {
52: String ret = super .getPath();
53: return (ret == null ? "/robots.txt" : ret);
54: }
55:
56: public void doGet(HttpServletRequest req, HttpServletResponse res)
57: throws ServletException, IOException {
58:
59: // write blocking response
60: res.setContentType("text/plain");
61: PrintWriter out = res.getWriter();
62: out.print("User-agent: *\nDisallow: /\n");
63: out.close();
64: }
65: }
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