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annotate flys-client/src/main/java/de/intevation/flys/client/server/GreetingServiceImpl.java @ 0:4e8be5e7855f

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Start of a GWT based client for FLYS-3.0 flys-client/trunk@1305 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 08 Feb 2011 10:29:49 +0000
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4e8be5e7855f Start of a GWT based client for FLYS-3.0
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 package de.intevation.flys.client.server;
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3 import de.intevation.flys.client.client.GreetingService;
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4 import de.intevation.flys.client.shared.FieldVerifier;
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5 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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6
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7 /**
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8 * The server side implementation of the RPC service.
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9 */
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10 @SuppressWarnings("serial")
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11 public class GreetingServiceImpl extends RemoteServiceServlet implements
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12 GreetingService {
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13
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14 public String greetServer(String input) throws IllegalArgumentException {
4e8be5e7855f Start of a GWT based client for FLYS-3.0
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15 // Verify that the input is valid.
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16 if (!FieldVerifier.isValidName(input)) {
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17 // If the input is not valid, throw an IllegalArgumentException back to
4e8be5e7855f Start of a GWT based client for FLYS-3.0
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18 // the client.
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19 throw new IllegalArgumentException(
4e8be5e7855f Start of a GWT based client for FLYS-3.0
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20 "Name must be at least 4 characters long");
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21 }
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22
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23 String serverInfo = getServletContext().getServerInfo();
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24 String userAgent = getThreadLocalRequest().getHeader("User-Agent");
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25
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26 // Escape data from the client to avoid cross-site script vulnerabilities.
4e8be5e7855f Start of a GWT based client for FLYS-3.0
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27 input = escapeHtml(input);
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28 userAgent = escapeHtml(userAgent);
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29
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30 return "Hello, " + input + "!<br><br>I am running " + serverInfo
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31 + ".<br><br>It looks like you are using:<br>" + userAgent;
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32 }
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33
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34 /**
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35 * Escape an html string. Escaping data received from the client helps to
4e8be5e7855f Start of a GWT based client for FLYS-3.0
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36 * prevent cross-site script vulnerabilities.
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37 *
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38 * @param html the html string to escape
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39 * @return the escaped string
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40 */
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41 private String escapeHtml(String html) {
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42 if (html == null) {
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43 return null;
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44 }
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45 return html.replaceAll("&", "&amp;").replaceAll("<", "&lt;").replaceAll(
4e8be5e7855f Start of a GWT based client for FLYS-3.0
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46 ">", "&gt;");
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47 }
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48 }
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