1 | /*
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2 | * OAIServer.java
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3 | * Copyright (C) 2002 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;
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20 |
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21 | import java.io.IOException;
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22 | import java.io.PrintWriter;
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23 | import java.util.HashSet;
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24 | import java.util.Iterator;
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25 | import java.util.Map;
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26 |
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27 | import javax.servlet.ServletConfig;
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28 | import javax.servlet.ServletException;
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29 | import javax.servlet.http.HttpServletRequest;
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30 | import javax.servlet.http.HttpServletResponse;
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31 |
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32 | import org.apache.log4j.Logger;
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33 | import org.greenstone.gsdl3.comms.Communicator;
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34 | import org.greenstone.gsdl3.comms.SOAPCommunicator;
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35 | import org.greenstone.gsdl3.core.MessageRouter;
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36 | import org.greenstone.gsdl3.core.OAIReceptionist;
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37 | import org.greenstone.gsdl3.util.GSConstants;
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38 | import org.greenstone.gsdl3.util.GSParams;
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39 | import org.greenstone.gsdl3.util.GSXML;
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40 | import org.greenstone.gsdl3.util.OAIXML;
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41 | import org.greenstone.gsdl3.util.XMLConverter;
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42 | import org.w3c.dom.Document;
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43 | import org.w3c.dom.Element;
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44 | import org.w3c.dom.Node;
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45 |
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46 | /** a servlet to serve the OAI metadata harvesting - we are using servlets instead
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47 | * of cgi
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48 | * the init method is called only once - the first time the servlet classes
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49 | * are loaded. Each time a request comes in to the servlet, the session()
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50 | * method is called in a new thread (calls doGet/doPut etc)
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51 | * takes the verb= type args and builds a simple request to send to
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52 | * the oai receptionist, which returns a result in xml, conforming to the OAI-PMH
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53 | * protocol.
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54 | * @see Receptionist
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55 | */
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56 | /**
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57 | * OAI server configuration instructions *
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58 | *
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59 | */
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60 | public class OAIServer extends BaseGreenstoneServlet
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61 | {
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62 |
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63 | /** the receptionist to send messages to */
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64 | protected OAIReceptionist recept = null;
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65 | /**
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66 | * the default language - is specified by setting a servlet param, otherwise
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67 | * DEFAULT_LANG is used
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68 | */
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69 | protected String default_lang = null;
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70 | /**
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71 | * The default default - used if a default lang is not specified in the
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72 | * servlet params
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73 | */
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74 | protected final String DEFAULT_LANG = "en";
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75 |
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76 | /**
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77 | * a converter class to parse XML and create Docs This is only used for
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78 | * generating internal requests passed to MessageRouter. The response
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79 | * message is generated by parsing an existing xml skeleton file
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80 | * (web/WEB-INF/oaixml/oaiversion2.xml, for example).
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81 | */
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82 | protected XMLConverter converter = null;
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83 | /**
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84 | * container Document to create XML Nodes (but only request to the oai
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85 | * receptionist, not response (which is created in OAIXML.java) created by
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86 | * converter class
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87 | */
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88 | protected Document doc = null;
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89 |
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90 | /** A HashSet which contains all the legal verbs. */
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91 | protected HashSet<String> verb_set = null;
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92 | /**
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93 | * A HashSet which contains all the legal oai keys in the key/value argument
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94 | * pair.
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95 | */
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96 | protected HashSet<String> param_set = null;
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97 | /**
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98 | * The name of the site with which we will finally be dealing, whether it is
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99 | * a local site or a remote site through a communicator.
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100 | */
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101 | protected String site = "";
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102 |
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103 | // do we output the stylesheet processing instruction?
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104 | protected boolean use_oai_stylesheet = true;
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105 | protected String oai_stylesheet = "interfaces/oai/oai2.xsl";
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106 |
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107 | // there is no getQueryString() method in the HttpServletRequest returned from doPost,
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108 | // since that is actually of type apache RequestFacade, and doesn't define such a method
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109 | protected String queryString = null;
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110 |
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111 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.OAIServer.class.getName());
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112 |
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113 | /**
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114 | * initialise the servlet
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115 | */
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116 | public void init(ServletConfig config) throws ServletException
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117 | {
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118 | // always call super.init, i.e., HttpServlet.;
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119 | super.init(config);
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120 | this.default_lang = config.getInitParameter(GSConstants.DEFAULT_LANG);
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121 |
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122 | initVerbs();
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123 | initParams();
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124 |
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125 | String site_name = config.getInitParameter(GSConstants.SITE_NAME);
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126 | String remote_site_name = null;
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127 | String remote_site_type = null;
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128 | String remote_site_address = null;
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129 |
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130 | if (site_name == null)
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131 | {
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132 | // no local site, try for communicator (remote site)
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133 | remote_site_name = config.getInitParameter("remote_site_name");
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134 | remote_site_type = config.getInitParameter("remote_site_type");
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135 | remote_site_address = config.getInitParameter("remote_site_address");
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136 | if (remote_site_name == null || remote_site_type == null || remote_site_address == null)
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137 | {
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138 | System.err.println("initialisation paramters not all set!");
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139 | System.err.println("if site_name is not set, then you must have remote_site_name, remote_site_type and remote_site_address set");
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140 | System.exit(1);
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141 | }
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142 | }
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143 |
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144 | if (this.default_lang == null)
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145 | {
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146 | // choose english
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147 | this.default_lang = DEFAULT_LANG;
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148 | }
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149 |
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150 | // the receptionist -the servlet will talk to this
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151 | this.recept = new OAIReceptionist();
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152 |
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153 | // the receptionist uses a MessageRouter or Communicator to send its requests to. We either create a MessageRouter here for the designated site (if site_name set), or we create a Communicator for a remote site. The is given to teh Receptionist, and the servlet never talks to it again.directly.
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154 | if (site_name != null)
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155 | {
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156 | //this site_name could consist of comma separated more than one site name.
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157 | String mr_name = (String) config.getInitParameter("messagerouter_class");
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158 | MessageRouter message_router = null;
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159 | if (mr_name == null)
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160 | { // just use the normal MR *********
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161 | message_router = new MessageRouter();
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162 | }
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163 | else
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164 | { // try the specified one
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165 | try
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166 | {
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167 | message_router = (MessageRouter) Class.forName("org.greenstone.gsdl3.core." + mr_name).newInstance();
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168 | }
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169 | catch (Exception e)
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170 | { // cant use this new one, so use normal one
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171 | System.err.println("OAIServlet configure exception when trying to use a new MessageRouter " + mr_name + ": " + e.getMessage());
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172 | e.printStackTrace();
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173 | message_router = new MessageRouter();
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174 | }
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175 | }
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176 |
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177 | message_router.setSiteName(site_name);
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178 | // lots of work is done in this step; see MessageRouter.java
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179 | message_router.configure();
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180 | this.recept.setSiteName(site_name);
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181 | this.recept.setMessageRouter(message_router);
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182 |
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183 | }
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184 | else
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185 | {
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186 | // talking to a remote site, create a communicator
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187 | Communicator communicator = null;
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188 | // we need to create the XML to configure the communicator
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189 | Element site_elem = this.doc.createElement(GSXML.SITE_ELEM);
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190 | site_elem.setAttribute(GSXML.TYPE_ATT, remote_site_type);
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191 | site_elem.setAttribute(GSXML.NAME_ATT, remote_site_name);
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192 | site_elem.setAttribute(GSXML.ADDRESS_ATT, remote_site_address);
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193 |
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194 | if (remote_site_type.equals(GSXML.COMM_TYPE_SOAP_JAVA))
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195 | {
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196 | communicator = new SOAPCommunicator();
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197 | }
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198 | else
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199 | {
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200 | System.err.println("OAIServlet.init Error: invalid Communicator type: " + remote_site_type);
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201 | System.exit(1);
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202 | }
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203 |
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204 | if (!communicator.configure(site_elem))
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205 | {
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206 | System.err.println("OAIServlet.init Error: Couldn't configure communicator");
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207 | System.exit(1);
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208 | }
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209 | this.recept.setSiteName(remote_site_name);
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210 | this.recept.setMessageRouter(communicator);
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211 | }
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212 | // used for composing internal xml requests, but not xml responses.
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213 | // the converter may be used to get pretty xml, though.
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214 | this.converter = new XMLConverter();
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215 | this.doc = this.converter.newDOM();
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216 |
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217 | // Read in OAIConfig.xml (residing web/WEB-INF/classes/) and
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218 | //use it to configure the receptionist. The init() is also called in which
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219 | //the resumption token file is read in and all expired tokens cleared.
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220 | Element oai_config = OAIXML.getOAIConfigXML();
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221 | if (oai_config == null)
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222 | {
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223 | logger.error("Fail to parse oai config file OAIConfig.xml.");
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224 | return;
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225 | }
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226 | // pass it to the receptionist
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227 | this.recept.configure(oai_config);
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228 |
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229 | // also, we have something we want to get from here - useOAIStylesheet
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230 | this.configure(oai_config);
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231 | }//end of init()
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232 |
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233 | private void configure(Element oai_config)
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234 | {
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235 | Element use_stylesheet_elem = (Element) GSXML.getChildByTagName(oai_config, OAIXML.USE_STYLESHEET);
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236 | if (use_stylesheet_elem != null)
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237 | {
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238 | String value = GSXML.getNodeText(use_stylesheet_elem);
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239 | if (value.equals("no"))
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240 | {
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241 | this.use_oai_stylesheet = false;
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242 | }
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243 | }
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244 | if (this.use_oai_stylesheet)
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245 | {
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246 | // now see if there is a custom stylesheet specified
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247 | Element stylesheet_elem = (Element) GSXML.getChildByTagName(oai_config, OAIXML.STYLESHEET);
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248 | if (stylesheet_elem != null)
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249 | {
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250 | String value = GSXML.getNodeText(stylesheet_elem);
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251 | if (!value.equals(""))
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252 | {
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253 | oai_stylesheet = value;
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254 | }
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255 | }
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256 |
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257 | }
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258 | }
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259 |
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260 | private void initVerbs()
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261 | {
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262 | verb_set = new HashSet<String>();
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263 | verb_set.add(OAIXML.GET_RECORD);
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264 | verb_set.add(OAIXML.LIST_RECORDS);
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265 | verb_set.add(OAIXML.LIST_IDENTIFIERS);
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266 | verb_set.add(OAIXML.LIST_SETS);
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267 | verb_set.add(OAIXML.LIST_METADATA_FORMATS);
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268 | verb_set.add(OAIXML.IDENTIFY);
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269 | }
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270 |
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271 | private void initParams()
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272 | {
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273 | param_set = new HashSet<String>();
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274 | param_set.add(OAIXML.METADATA_PREFIX);
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275 | param_set.add(OAIXML.FROM);
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276 | param_set.add(OAIXML.UNTIL);
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277 | param_set.add(OAIXML.SET);
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278 | param_set.add(OAIXML.RESUMPTION_TOKEN);
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279 | param_set.add(OAIXML.IDENTIFIER);
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280 | }
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281 |
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282 | private void logUsageInfo(HttpServletRequest request)
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283 | {
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284 | String usageInfo = "";
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285 |
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286 | String query = (queryString == null) ? request.getQueryString() : queryString;
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287 |
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288 | //logged info = general-info + session-info
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289 | usageInfo = request.getContextPath() + " " + //session id
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290 | request.getServletPath() + " " + //serlvet
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291 | "[" + query + "]" + " " + //the query string
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292 | "[" + usageInfo.trim() + "]" + " " + // params stored in a session
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293 | request.getRemoteAddr() + " " + //remote address
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294 | request.getHeader("user-agent") + " "; //the remote brower info
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295 |
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296 | logger.info(usageInfo);
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297 | }
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298 |
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299 | /**
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300 | * return true if the url is in the form of baseURL?verb=...,
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301 | */
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302 | private boolean validate(String query, String verb)
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303 | {
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304 | //Here in OAIServer, only the verbs are validated. All the validation for individual verb
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305 | // is taken in their doXXX() methods.
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306 | if (query == null || !query.startsWith(OAIXML.VERB + "="))
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307 | {
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308 | return false;
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309 | }
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310 | if (!verb_set.contains(verb))
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311 | {
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312 | return false;
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313 | }
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314 | return true;
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315 | }
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316 |
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317 | private String getVerb(String query)
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318 | {
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319 | if (query == null)
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320 | return "";
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321 | int verb_start_index = query.indexOf("=") + 1;// first occurence of '='
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322 | int verb_end_index = query.indexOf("&");
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323 | if (verb_end_index == -1)
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324 | {
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325 | return query.substring(verb_start_index);
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326 | }
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327 | return query.substring(verb_start_index, verb_end_index);
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328 | }
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329 |
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330 | public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
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331 | {
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332 | logUsageInfo(request);
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333 | //out.println("url="+request.getRequestURL());// /oaiserver
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334 | //out.println("query="+request.getQueryString());// is /greenstone3
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335 |
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336 | // oai always requires the content type be text/xml
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337 | request.setCharacterEncoding("UTF-8");
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338 | response.setContentType("text/xml;charset=UTF-8");
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339 | PrintWriter out = response.getWriter();
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340 |
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341 | //
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342 | String lang = request.getParameter(GSParams.LANGUAGE);
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343 | if (lang == null || lang.equals(""))
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344 | {
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345 | // use the default
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346 | lang = this.default_lang;
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347 | }
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348 | //we don't get the baseURL from the http request because what we get might be different from the one known publicly due to local network redirection.
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349 | //For example, puka.cs.waikato.ac.nz vs www.greenstone.org
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350 | //String base_url = request.getRequestURL().toString();
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351 | // if called by doPost (if this was originally a POST request), var queryString would have been set
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352 | String query = (queryString == null) ? request.getQueryString() : queryString;
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353 | queryString = null; // reset member variable, else no doGet will work as long as the server remains running
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354 |
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355 | String[] pairs = (query == null) ? null : query.split("&");//split into key/value pairs
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356 | String verb = getVerb(query);
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357 | Element xml_response = OAIXML.createBasicResponse(verb, pairs);
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358 | Element verb_elem = null;
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359 |
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360 | if (validate(query, verb) == false)
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361 | {
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362 | if (verb_set.contains(verb) == false)
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363 | {
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364 | logger.error(OAIXML.BAD_VERB + ": " + query);
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365 | verb_elem = OAIXML.createErrorElement(OAIXML.BAD_VERB, OAIXML.ILLEGAL_OAI_VERB);
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366 | }
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367 | else
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368 | {
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369 | //must be something else other than bad verbs caused an error, so bad argument
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370 | logger.error(OAIXML.BAD_ARGUMENT + ": " + query);
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371 | verb_elem = OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, "");
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372 | }
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373 | xml_response.appendChild(verb_elem);
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374 |
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375 | out.println("<?xml version='1.0' encoding='UTF-8' ?>");
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376 | if (this.use_oai_stylesheet)
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377 | {
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378 | out.println("<?xml-stylesheet type='text/xsl' href='" + this.oai_stylesheet + "' ?>\n");
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379 | }
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380 | out.println(this.converter.getPrettyString(xml_response));
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381 | return;
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382 | }//end of if(validate
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383 |
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384 | // The query is valid, we can now
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385 | // compose the request message to the receptionist
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386 | Element xml_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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387 | Element xml_request = this.doc.createElement(GSXML.REQUEST_ELEM);
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388 | // The type attribute is set to be 'oaiService' from OAIServer to OAIReceptionist.
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389 | //xml_request.setAttribute(GSXML.TYPE_ATT, OAIXML.OAI_SERVICE);
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390 | xml_request.setAttribute(GSXML.LANG_ATT, lang);
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391 | xml_request.setAttribute(GSXML.TO_ATT, verb);
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392 | addParams(xml_request, pairs);
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393 |
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394 | //xml_request.setAttribute(GSXML.OUTPUT_ATT, output);????
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395 | xml_message.appendChild(xml_request);
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396 |
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397 | Node xml_result = this.recept.process(xml_message);
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398 | if (xml_result == null)
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399 | {
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400 | logger.info("xml_result is null");
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401 | verb_elem = OAIXML.createErrorElement("Internal error", "");
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402 | xml_response.appendChild(verb_elem);
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403 | }
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404 | else
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405 | {
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406 |
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407 | /**
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408 | * All response elements are in the form (with a corresponding verb
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409 | * name): <message> <response> <verb> ... <resumptionToken> .. this
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410 | * is optional! </resumptionToken> </verb> </response> </message>
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411 | */
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412 | Node res = GSXML.getChildByTagName(xml_result, OAIXML.RESPONSE);
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413 | if (res == null)
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414 | {
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415 | logger.info("response element in xml_result is null");
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416 | verb_elem = OAIXML.createErrorElement("Internal error", "");
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417 | }
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418 | else
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419 | {
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420 | verb_elem = GSXML.getFirstElementChild(res);
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421 | }
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422 |
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423 | if (OAIXML.oai_version.equals(OAIXML.OAI_VERSION2) || verb_elem.getTagName().equals(OAIXML.ERROR))
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424 | {
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425 | xml_response.appendChild(xml_response.getOwnerDocument().importNode(verb_elem, true));
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426 | }
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427 | else
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428 | {
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429 | GSXML.copyAllChildren(xml_response, verb_elem);
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430 | }
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431 | }
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432 | out.println("<?xml version='1.0' encoding='UTF-8' ?>");
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433 | if (this.use_oai_stylesheet)
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434 | {
|
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435 | out.println("<?xml-stylesheet type='text/xsl' href='" + this.oai_stylesheet + "' ?>\n");
|
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436 | }
|
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437 | out.println(this.converter.getPrettyString(xml_response));
|
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438 | return;
|
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439 | }
|
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440 |
|
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441 | /** append parameter elements to the request sent to the receptionist */
|
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442 | public void addParams(Element request, String[] pairs)
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443 | {
|
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444 | // no params apart from the verb
|
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445 | if (pairs == null || pairs.length < 2)
|
---|
446 | return;
|
---|
447 |
|
---|
448 | /**
|
---|
449 | * the request xml is composed in the form: <request> <param name=.../>
|
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450 | * <param name=.../> </request> (No paramList element in between).
|
---|
451 | */
|
---|
452 | for (int i = 1; i < pairs.length; i++)
|
---|
453 | {
|
---|
454 | //the first pair in pairs is the verb=xxx
|
---|
455 | int index = pairs[i].indexOf("=");
|
---|
456 | if (index != -1)
|
---|
457 | { //just a double check
|
---|
458 | Element param = this.doc.createElement(OAIXML.PARAM);
|
---|
459 | param.setAttribute(OAIXML.NAME, pairs[i].substring(0, index));
|
---|
460 | param.setAttribute(OAIXML.VALUE, OAIXML.oaiDecode(pairs[i].substring(index + 1)));
|
---|
461 | request.appendChild(param);
|
---|
462 | }
|
---|
463 | }
|
---|
464 | }
|
---|
465 |
|
---|
466 | // For OAI version 2.0, validation tests indicated that POST needs to be supported. Some
|
---|
467 | // modification was required in order to ensure that the request is passed intact to doGet()
|
---|
468 | public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
|
---|
469 | {
|
---|
470 |
|
---|
471 | // the post method returns a wrapper of type RequestFacade by apache and there
|
---|
472 | // is no getQueryString() method defined for it. Therefore, need to work this out
|
---|
473 | // manually before calling doGet(request, response) so that doGet can work as before.
|
---|
474 |
|
---|
475 | queryString = "";
|
---|
476 | Iterator parameter_entries = request.getParameterMap().entrySet().iterator();
|
---|
477 | while (parameter_entries.hasNext())
|
---|
478 | {
|
---|
479 | Map.Entry param_entry = (Map.Entry) parameter_entries.next();
|
---|
480 | String[] paramVals = (String[]) param_entry.getValue();
|
---|
481 | if (paramVals != null)
|
---|
482 | {
|
---|
483 | if (paramVals.length > 0)
|
---|
484 | {
|
---|
485 | logger.error("POST request received: " + param_entry.getKey() + " - " + paramVals[0]);
|
---|
486 | queryString = queryString + "&" + param_entry.getKey() + "=" + paramVals[0];
|
---|
487 | }
|
---|
488 | }
|
---|
489 | }
|
---|
490 | if (queryString.length() > 0)
|
---|
491 | {
|
---|
492 | queryString = queryString.substring(1);
|
---|
493 | //queryString = OAIXML.oaiEncode(queryString);
|
---|
494 | }
|
---|
495 | if (queryString.equals(""))
|
---|
496 | {
|
---|
497 | queryString = null;
|
---|
498 | }
|
---|
499 | doGet(request, response);
|
---|
500 | }
|
---|
501 | }
|
---|