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.io.File;
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14 |
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15 | /** a servlet to serve the greenstone library - we are using servlets instead
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16 | * of cgi
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17 | * the init method is called only once - the first time the servlet classes
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18 | * are loaded. Each time a request comes in to the servlet, the session()
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19 | * method is called in a new thread (calls doGet/doPut etc)
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20 | * takes the a=p&p=home type args and builds a simple request to send to
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21 | * its receptionist, which returns a result in html, cos output=html
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22 | * is set in the request
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23 | * @see Receptionist
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24 | */
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25 | public class LibraryServlet extends HttpServlet {
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26 |
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27 | /** the receptionist to send messages to */
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28 | protected WebReceptionist recept=null;
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29 | /** the default language - is specified by setting a servlet param,
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30 | * otherwise DEFAULT_LANG is used*/
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31 | protected String default_lang= null;
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32 | /** The default default - used if a default lang is not specified
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33 | * in the servlet params */
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34 | protected final String DEFAULT_LANG = "en";
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35 | /** container Document to create XML Nodes */
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36 | protected Document doc=null;
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37 | /** a converter class to parse XML and create Docs */
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38 | protected XMLConverter converter=null;
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39 | /** the cgi stuff - the Receptionist can add new args to this
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40 | * its used by the servlet to determine what args to save */
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41 | protected GSCGI cgi = null;
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42 | /** initialise the servlet
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43 | */
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44 | public void init(ServletConfig config) throws ServletException {
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45 | // always call super.init;
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46 | super.init(config);
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47 |
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48 | ConfigVars config_vars = new ConfigVars();
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49 | String library_name = config.getInitParameter("libraryname");
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50 | String gsdl3_home = config.getInitParameter("gsdl3home");
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51 | String site_name = config.getInitParameter("sitename");
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52 | String interface_name = config.getInitParameter("interfacename");
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53 | this.default_lang = config.getInitParameter("defaultlang");
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54 | if (library_name == null || gsdl3_home == null || site_name ==null || interface_name ==null) {
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55 | // must have this
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56 | System.err.println("initialisation parameters not all set!");
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57 | System.err.println(" you must have libraryname, gsdl3home, sitename, interfacename");
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58 | System.exit(1);
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59 | }
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60 |
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61 | if (this.default_lang == null) {
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62 | // choose english
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63 | this.default_lang = DEFAULT_LANG;
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64 | }
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65 |
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66 | config_vars.library_name_ = library_name;
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67 | config_vars.gsdl3_home_ = gsdl3_home;
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68 | config_vars.site_name_ = site_name;
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69 | config_vars.interface_name_ =interface_name;
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70 | config_vars.default_language_ = this.default_lang;
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71 | config_vars.createXML();
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72 |
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73 | this.converter = new XMLConverter();
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74 | this.doc = this.converter.newDOM();
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75 |
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76 | // now try and create MR and recpt
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77 | // new message router - create it and pass reference to recept.
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78 | // the servlet wont use this directly
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79 | String mr_name = (String)config.getInitParameter("messagerouter");
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80 | MessageRouter message_router = null;
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81 | if (mr_name == null) { // just use the normal MR
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82 | message_router = new MessageRouter();
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83 | } else { // try the specified one
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84 | try {
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85 | message_router = (MessageRouter)Class.forName("org.greenstone.gsdl3.core."+mr_name).newInstance();
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86 | } catch (Exception e) { // cant use this new one, so use normal one
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87 | System.out.println("LibraryServlet configure exception when trying to use a new MessageRouter "+mr_name+": "+e.getMessage());
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88 | e.printStackTrace();
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89 | message_router = new MessageRouter();
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90 | }
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91 | }
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92 |
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93 | message_router.setSiteHome(GSFile.siteHome(config_vars.gsdl3_home_,
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94 | config_vars.site_name_));
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95 | message_router.configure();
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96 |
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97 | // the receptionist -the servlet will talk to this
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98 | String recept_name = (String)config.getInitParameter("receptionist");
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99 | if (recept_name == null) {
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100 | this.recept = new DefaultReceptionist();
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101 | } else {
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102 | try {
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103 | this.recept = (WebReceptionist)Class.forName("org.greenstone.gsdl3.core."+recept_name).newInstance();
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104 | } catch (Exception e) { // cant use this new one, so use normal one
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105 | System.out.println("LibraryServlet configure exception when trying to use a new Receptionist "+recept_name+": "+e.getMessage());
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106 | e.printStackTrace();
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107 | this.recept = new DefaultReceptionist();
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108 | }
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109 | }
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110 | this.recept.setConfigVars(config_vars);
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111 | this.recept.setMessageRouter(message_router);
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112 | this.recept.configure();
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113 | // the cgi arg thingy
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114 |
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115 | String cgi_name = (String)config.getInitParameter("cgiargs");
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116 | if (cgi_name == null) {
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117 | this.cgi = new GSCGI();
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118 | } else {
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119 | try {
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120 | this.cgi = (GSCGI)Class.forName("org.greenstone.gsdl3.util."+cgi_name).newInstance();
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121 | } catch (Exception e) {
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122 | System.out.println("LibraryServlet configure exception when trying to use a new cgi thing "+cgi_name+": "+e.getMessage());
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123 | e.printStackTrace();
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124 | this.cgi = new GSCGI();
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125 | }
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126 | }
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127 | // pass it to the receptionist
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128 | this.recept.setCGI(this.cgi);
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129 | }
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130 |
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131 | public void doGet(HttpServletRequest request,
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132 | HttpServletResponse response)
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133 | throws ServletException, IOException {
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134 |
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135 | HttpSession session = request.getSession(true);
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136 |
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137 | // print them out to test it
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138 | // Enumeration stored_names = session.getAttributeNames();
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139 | // System.out.println("session values are:");
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140 | // while (stored_names.hasMoreElements()) {
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141 | // String name = (String)stored_names.nextElement();
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142 | // System.out.println("stored "+name+":" +session.getAttribute(name));
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143 | // }
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144 |
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145 | request.setCharacterEncoding("UTF-8");
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146 | response.setContentType("text/html;charset=UTF-8");
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147 | PrintWriter out = response.getWriter();
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148 |
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149 | String lang = request.getParameter(GSCGI.LANGUAGE_ARG);
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150 | if (lang==null || lang.equals("")) {
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151 | // try the session cached lang
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152 | lang = (String)session.getAttribute(GSCGI.LANGUAGE_ARG);
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153 | if (lang==null || lang.equals("")) {
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154 | // still not set, use the default
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155 | lang = this.default_lang;
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156 | }
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157 | }
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158 |
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159 | // set the lang in the session
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160 | session.setAttribute(GSCGI.LANGUAGE_ARG, lang);
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161 |
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162 | String output = request.getParameter(GSCGI.OUTPUT_ARG);
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163 | if (output==null || output.equals("")) {
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164 | output = "html"; // uses html by default
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165 | }
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166 |
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167 | // the request to the receptionist
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168 | Element xml_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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169 | Element xml_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_CGI, "", lang);
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170 | xml_request.setAttribute(GSXML.OUTPUT_ATT, output);
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171 | xml_message.appendChild(xml_request);
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172 |
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173 |
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174 | String action = request.getParameter(GSCGI.ACTION_ARG);
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175 | String subaction = request.getParameter(GSCGI.SUBACTION_ARG);
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176 | if (action==null || action.equals("")) {
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177 | // should we do all the following stuff if using default page?
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178 | // display the home page - the default page
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179 | action = "p";
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180 | subaction = PageAction.HOME_PAGE;
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181 | xml_request.setAttribute(GSXML.ACTION_ATT, action);
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182 | xml_request.setAttribute(GSXML.SUBACTION_ATT, subaction);
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183 |
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184 | } else {
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185 |
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186 | xml_request.setAttribute(GSXML.ACTION_ATT, action);
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187 | if (subaction != null) {
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188 | xml_request.setAttribute(GSXML.SUBACTION_ATT, subaction);
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189 | }
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190 |
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191 | // create the param list for the greenstone request - includes
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192 | // the params from the current request and any others from the saved session
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193 | Element xml_param_list = this.doc.createElement(GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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194 | xml_request.appendChild(xml_param_list);
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195 |
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196 | Enumeration params = request.getParameterNames();
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197 | while(params.hasMoreElements()) {
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198 | String name = (String)params.nextElement();
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199 | if (!name.equals(GSCGI.ACTION_ARG) && !name.equals(GSCGI.SUBACTION_ARG) && !name.equals(GSCGI.LANGUAGE_ARG) && !name.equals(GSCGI.OUTPUT_ARG)) {// we have already dealt with these
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200 | String value="";
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201 | String [] values = request.getParameterValues(name);
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202 | value = values[0];
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203 | if (values.length > 1) {
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204 | for (int i=1; i< values.length; i++) {
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205 | value += ","+values[i];
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206 | }
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207 | }
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208 | // either add it to the param list straight away, or save it to the session and add it later
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209 | if (this.cgi.shouldSave(name)) {
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210 | session.setAttribute(name, value);
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211 | } else {
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212 | Element param = this.doc.createElement(GSXML.PARAM_ELEM);
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213 | param.setAttribute(GSXML.NAME_ATT, name);
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214 | param.setAttribute(GSXML.VALUE_ATT, GSXML.xmlSafe(value));
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215 | xml_param_list.appendChild(param);
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216 | }
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217 | }
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218 | }
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219 |
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220 | // put in all the params from the session cache
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221 | params = session.getAttributeNames();
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222 | while(params.hasMoreElements()) {
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223 | String name = (String)params.nextElement();
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224 |
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225 | if ( !name.equals(GSCGI.LANGUAGE_ARG) ) { // lang is stored but we dont want it in the param list cos its already in the request
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226 |
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227 | Element param = this.doc.createElement(GSXML.PARAM_ELEM);
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228 | param.setAttribute(GSXML.NAME_ATT, name);
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229 | param.setAttribute(GSXML.VALUE_ATT, GSXML.xmlSafe((String)session.getAttribute(name)));
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230 | xml_param_list.appendChild(param);
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231 | }
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232 | }
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233 |
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234 |
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235 | }
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236 |
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237 | if (!output.equals("html")) {
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238 | response.setContentType("text/xml"); // for now use text
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239 | }
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240 |
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241 | Element xml_result = this.recept.process(xml_message);
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242 | encodeURLs(xml_result, response);
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243 | out.println(this.converter.getPrettyString(xml_result));
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244 | }
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245 |
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246 | /** this goes through each URL and adds in a session id if needed--
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247 | * its needed if the browser doesn't accept cookies
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248 | */
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249 | protected void encodeURLs(Element data, HttpServletResponse response) {
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250 |
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251 | // get all the <a> elements
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252 | NodeList hrefs = data.getElementsByTagName("a");
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253 | for (int i=0; i<hrefs.getLength(); i++) {
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254 | Element a = (Element)hrefs.item(i);
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255 | a.setAttribute("href", response.encodeURL(a.getAttribute("href")));
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256 | }
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257 |
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258 | // now find any submit bits - get all the <form> elements
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259 | NodeList forms = data.getElementsByTagName("form");
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260 | for (int i=0; i<forms.getLength(); i++) {
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261 | Element form = (Element)forms.item(i);
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262 | form.setAttribute("action", response.encodeURL(form.getAttribute("action")));
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263 | }
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264 | // are these the only cases where URLs occur??
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265 | // we should only do this for greenstone urls?
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266 |
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267 | }
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268 | }
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