1 | /*
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2 | * GSHTML.java
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3 | * Copyright (C) 2008 New Zealand Digital Library, http://www.nzdl.org
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4 | *
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5 | * This program is free software; you can redistribute it and/or modify
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6 | * it under the terms of the GNU General Public License as published by
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7 | * the Free Software Foundation; either version 2 of the License, or
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8 | * (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program; if not, write to the Free Software
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17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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18 | */
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19 | package org.greenstone.gsdl3.util;
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20 |
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21 | /** GSHTML - provides some convenience methods for dealing
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22 | * with html
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23 | */
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24 | public class GSHTML {
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25 |
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26 | /** make a string html safe */
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27 | public static String htmlSafe(String input) {
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28 |
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29 | StringBuffer filtered = new StringBuffer(input.length());
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30 | char c;
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31 | for (int i=0; i<input.length(); i++) {
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32 | c = input.charAt(i);
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33 | if (c == '<') {
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34 | filtered.append("<");
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35 | } else if (c == '>') {
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36 | filtered.append(">");
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37 | } else if (c == '"') {
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38 | filtered.append(""");
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39 | } else if (c == '&') {
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40 | filtered.append("&");
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41 | } else {
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42 | filtered.append(c);
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43 | }
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44 | }
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45 | return(filtered.toString());
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46 | }
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47 | /** undo the html safe action */
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48 | public static String htmlUnsafe(String input) {
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49 | StringBuffer filtered = new StringBuffer(input.length());
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50 | char c;
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51 | for (int i=0; i<input.length(); i++) {
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52 | c = input.charAt(i);
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53 | if (c =='&') {
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54 | int j=input.indexOf(';', i);
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55 | String entity = input.substring(i, j);
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56 | i=j;
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57 | if (entity.equals("&")) {
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58 | filtered.append('&');
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59 | } else if (entity.equals("<")){
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60 | filtered.append('<');
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61 | } else if (entity.equals(">")){
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62 | filtered.append('>');
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63 | } else if (entity.equals(""")) {
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64 | filtered.append('"');
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65 | } // else just ignore it.
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66 | } else {
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67 | filtered.append(c);
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68 | }
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69 |
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70 | }
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71 | return(filtered.toString());
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72 | }
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73 |
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74 | /** produce a default error page */
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75 | public static String errorPage(String error) {
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76 | String page = "<html><head><Title>GSDL3 Error!</Title></head>\n"+
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77 | "<body><h1>Greenstone Error!</h1>"+
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78 | "<p/>"+error+"</body></html>";
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79 | return page;
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80 | }
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81 |
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82 | }
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