1 | package org.greenstone.gsdl3;
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2 |
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3 | import org.greenstone.gsdl3.core.*;
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4 | import org.greenstone.gsdl3.util.*;
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5 | import org.greenstone.gsdl3.action.PageAction; // used to get the default action
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6 | import org.w3c.dom.Document;
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7 | import org.w3c.dom.Element;
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8 | import org.w3c.dom.NodeList;
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9 | import java.io.*;
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10 | import javax.servlet.*;
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11 | import javax.servlet.http.*;
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12 | import java.util.Enumeration;
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13 | import java.util.HashMap;
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14 | import java.io.File;
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15 |
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16 | /** a servlet to serve the greenstone library - we are using servlets instead
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17 | * of cgi
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18 | * the init method is called only once - the first time the servlet classes
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19 | * are loaded. Each time a request comes in to the servlet, the session()
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20 | * method is called in a new thread (calls doGet/doPut etc)
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21 | * takes the a=p&p=home type args and builds a simple request to send to
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22 | * its receptionist, which returns a result in html, cos output=html
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23 | * is set in the request
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24 | * @see Receptionist
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25 | */
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26 | public class LibraryServlet extends HttpServlet {
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27 |
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28 | /** the receptionist to send messages to */
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29 | protected Receptionist recept=null;
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30 | /** the default language - is specified by setting a servlet param,
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31 | * otherwise DEFAULT_LANG is used*/
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32 | protected String default_lang= null;
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33 | /** The default default - used if a default lang is not specified
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34 | * in the servlet params */
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35 | protected final String DEFAULT_LANG = "en";
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36 | /** container Document to create XML Nodes */
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37 | protected Document doc=null;
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38 | /** a converter class to parse XML and create Docs */
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39 | protected XMLConverter converter=null;
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40 | /** the cgi stuff - the Receptionist can add new args to this
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41 | * its used by the servlet to determine what args to save */
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42 | //protected GSCGI cgi = null;
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43 | protected GSParams params = null;
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44 |
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45 | /** user id - new one per session. This doesn't work if session state is saved between restarts - this requires this value to be saved too. */
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46 | protected int next_user_id = 0;
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47 |
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48 |
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49 | /** initialise the servlet
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50 | */
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51 | public void init(ServletConfig config) throws ServletException {
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52 | // always call super.init;
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53 | super.init(config);
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54 | // disable preferences - does this work anyway??
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55 | //System.setProperty("java.util.prefs.PreferencesFactory", "org.greenstone.gsdl3.util.DisabledPreferencesFactory");
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56 |
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57 | String library_name = config.getInitParameter(GSConstants.LIBRARY_NAME);
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58 | String gsdl3_home = config.getInitParameter(GSConstants.GSDL3_HOME);
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59 | String site_name = config.getInitParameter(GSConstants.SITE_NAME);
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60 | String interface_name = config.getInitParameter(GSConstants.INTERFACE_NAME);
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61 | this.default_lang = config.getInitParameter(GSConstants.DEFAULT_LANG);
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62 | if (library_name == null || gsdl3_home == null || site_name ==null || interface_name ==null) {
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63 | // must have this
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64 | System.err.println("initialisation parameters not all set!");
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65 | System.err.println(" you must have libraryname, gsdl3home, sitename, interfacename");
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66 | System.exit(1);
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67 | }
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68 |
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69 | if (this.default_lang == null) {
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70 | // choose english
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71 | this.default_lang = DEFAULT_LANG;
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72 | }
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73 |
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74 | HashMap config_params = new HashMap();
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75 |
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76 | config_params.put(GSConstants.LIBRARY_NAME, library_name);
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77 | config_params.put(GSConstants.GSDL3_HOME, gsdl3_home);
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78 | config_params.put(GSConstants.SITE_NAME, site_name);
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79 | config_params.put(GSConstants.INTERFACE_NAME, interface_name);
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80 |
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81 | this.converter = new XMLConverter();
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82 | this.doc = this.converter.newDOM();
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83 |
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84 | // now try and create MR and recpt
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85 | // new message router - create it and pass reference to recept.
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86 | // the servlet wont use this directly
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87 | String mr_name = (String)config.getInitParameter("messagerouter_class");
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88 | MessageRouter message_router = null;
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89 | if (mr_name == null) { // just use the normal MR
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90 | message_router = new MessageRouter();
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91 | } else { // try the specified one
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92 | try {
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93 | message_router = (MessageRouter)Class.forName("org.greenstone.gsdl3.core."+mr_name).newInstance();
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94 | } catch (Exception e) { // cant use this new one, so use normal one
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95 | System.err.println("LibraryServlet configure exception when trying to use a new MessageRouter "+mr_name+": "+e.getMessage());
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96 | e.printStackTrace();
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97 | message_router = new MessageRouter();
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98 | }
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99 | }
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100 |
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101 | message_router.setSiteHome(GSFile.siteHome(gsdl3_home,
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102 | site_name));
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103 | message_router.configure();
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104 |
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105 | // the receptionist -the servlet will talk to this
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106 | String recept_name = (String)config.getInitParameter("receptionist_class");
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107 | if (recept_name == null) {
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108 | this.recept = new DefaultReceptionist();
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109 | } else {
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110 | try {
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111 | this.recept = (Receptionist)Class.forName("org.greenstone.gsdl3.core."+recept_name).newInstance();
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112 | } catch (Exception e) { // cant use this new one, so use normal one
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113 | System.err.println("LibraryServlet configure exception when trying to use a new Receptionist "+recept_name+": "+e.getMessage());
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114 | e.printStackTrace();
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115 | this.recept = new DefaultReceptionist();
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116 | }
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117 | }
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118 | this.recept.setConfigParams(config_params);
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119 | this.recept.setMessageRouter(message_router);
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120 | // the params arg thingy
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121 |
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122 | String params_name = (String)config.getInitParameter("params_class");
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123 | if (params_name == null) {
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124 | this.params = new GSParams();
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125 | } else {
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126 | try {
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127 | this.params = (GSParams)Class.forName("org.greenstone.gsdl3.util."+params_name).newInstance();
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128 | } catch (Exception e) {
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129 | System.err.println("LibraryServlet configure exception when trying to use a new params thing "+params_name+": "+e.getMessage());
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130 | e.printStackTrace();
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131 | this.params = new GSParams();
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132 | }
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133 | }
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134 | // pass it to the receptionist
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135 | this.recept.setParams(this.params);
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136 | this.recept.configure();
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137 |
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138 | }
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139 |
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140 | public void doGet(HttpServletRequest request,
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141 | HttpServletResponse response)
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142 | throws ServletException, IOException {
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143 |
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144 | HttpSession session = request.getSession(true);
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145 | String uid = (String)session.getAttribute(GSXML.USER_ID_ATT);
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146 | if (uid ==null) {
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147 | uid = ""+getNextUserId();
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148 | session.setAttribute(GSXML.USER_ID_ATT, uid);
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149 | }
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150 | request.setCharacterEncoding("UTF-8");
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151 | response.setContentType("text/html;charset=UTF-8");
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152 | PrintWriter out = response.getWriter();
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153 |
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154 | String lang = request.getParameter(GSParams.LANGUAGE);
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155 | if (lang==null || lang.equals("")) {
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156 | // try the session cached lang
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157 | lang = (String)session.getAttribute(GSParams.LANGUAGE);
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158 | if (lang==null || lang.equals("")) {
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159 | // still not set, use the default
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160 | lang = this.default_lang;
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161 | }
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162 | }
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163 |
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164 | // set the lang in the session
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165 | session.setAttribute(GSParams.LANGUAGE, lang);
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166 |
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167 | String output = request.getParameter(GSParams.OUTPUT);
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168 | if (output==null || output.equals("")) {
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169 | output = "html"; // uses html by default
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170 | }
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171 |
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172 | // the request to the receptionist
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173 | Element xml_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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174 | Element xml_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PAGE, "", lang, uid);
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175 | xml_request.setAttribute(GSXML.OUTPUT_ATT, output);
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176 | xml_message.appendChild(xml_request);
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177 |
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178 |
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179 | String action = request.getParameter(GSParams.ACTION);
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180 | String subaction = request.getParameter(GSParams.SUBACTION);
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181 | if (action==null || action.equals("")) {
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182 | // should we do all the following stuff if using default page?
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183 | // display the home page - the default page
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184 | action = "p";
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185 | subaction = PageAction.HOME_PAGE;
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186 | xml_request.setAttribute(GSXML.ACTION_ATT, action);
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187 | xml_request.setAttribute(GSXML.SUBACTION_ATT, subaction);
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188 |
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189 | } else {
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190 |
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191 | xml_request.setAttribute(GSXML.ACTION_ATT, action);
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192 | if (subaction != null) {
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193 | xml_request.setAttribute(GSXML.SUBACTION_ATT, subaction);
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194 | }
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195 |
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196 | // create the param list for the greenstone request - includes
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197 | // the params from the current request and any others from the saved session
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198 | Element xml_param_list = this.doc.createElement(GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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199 | xml_request.appendChild(xml_param_list);
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200 |
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201 | Enumeration params = request.getParameterNames();
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202 | while(params.hasMoreElements()) {
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203 | String name = (String)params.nextElement();
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204 | if (!name.equals(GSParams.ACTION) && !name.equals(GSParams.SUBACTION) && !name.equals(GSParams.LANGUAGE) && !name.equals(GSParams.OUTPUT)) {// we have already dealt with these
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205 | String value="";
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206 | String [] values = request.getParameterValues(name);
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207 | value = values[0];
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208 | if (values.length > 1) {
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209 | for (int i=1; i< values.length; i++) {
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210 | value += ","+values[i];
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211 | }
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212 | }
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213 | // either add it to the param list straight away, or save it to the session and add it later
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214 | if (this.params.shouldSave(name)) {
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215 | session.setAttribute(name, value);
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216 | } else {
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217 | Element param = this.doc.createElement(GSXML.PARAM_ELEM);
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218 | param.setAttribute(GSXML.NAME_ATT, name);
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219 | param.setAttribute(GSXML.VALUE_ATT, GSXML.xmlSafe(value));
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220 | xml_param_list.appendChild(param);
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221 | }
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222 | }
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223 | }
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224 |
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225 | // put in all the params from the session cache
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226 | params = session.getAttributeNames();
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227 | while(params.hasMoreElements()) {
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228 | String name = (String)params.nextElement();
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229 |
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230 | if ( !name.equals(GSParams.LANGUAGE) && !name.equals(GSXML.USER_ID_ATT)) { // lang and uid are stored but we dont want it in the param list cos its already in the request
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231 |
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232 | Element param = this.doc.createElement(GSXML.PARAM_ELEM);
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233 | param.setAttribute(GSXML.NAME_ATT, name);
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234 | param.setAttribute(GSXML.VALUE_ATT, GSXML.xmlSafe((String)session.getAttribute(name)));
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235 | xml_param_list.appendChild(param);
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236 | }
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237 | }
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238 |
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239 |
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240 | }
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241 |
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242 | if (!output.equals("html")) {
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243 | response.setContentType("text/xml"); // for now use text
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244 | }
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245 |
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246 | Element xml_result = this.recept.process(xml_message);
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247 | encodeURLs(xml_result, response);
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248 | out.println(this.converter.getPrettyString(xml_result));
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249 | }
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250 |
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251 | /** this goes through each URL and adds in a session id if needed--
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252 | * its needed if the browser doesn't accept cookies
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253 | */
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254 | protected void encodeURLs(Element data, HttpServletResponse response) {
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255 |
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256 | if (data == null) {
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257 | return;
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258 | }
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259 | // get all the <a> elements
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260 | NodeList hrefs = data.getElementsByTagName("a");
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261 | for (int i=0; i<hrefs.getLength(); i++) {
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262 | Element a = (Element)hrefs.item(i);
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263 | a.setAttribute("href", response.encodeURL(a.getAttribute("href")));
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264 | }
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265 |
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266 | // now find any submit bits - get all the <form> elements
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267 | NodeList forms = data.getElementsByTagName("form");
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268 | for (int i=0; i<forms.getLength(); i++) {
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269 | Element form = (Element)forms.item(i);
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270 | form.setAttribute("action", response.encodeURL(form.getAttribute("action")));
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271 | }
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272 | // are these the only cases where URLs occur??
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273 | // we should only do this for greenstone urls?
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274 |
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275 | }
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276 |
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277 | synchronized protected int getNextUserId() {
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278 | next_user_id++;
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279 | return next_user_id;
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280 | }
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281 |
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282 | }
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