[14207] | 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 org.greenstone.gsdl3.comms.*;
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| 22 | import org.greenstone.gsdl3.core.*;
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| 23 | import org.greenstone.gsdl3.util.*;
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| 24 | import org.greenstone.gsdl3.action.PageAction; // used to get the default action
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| 25 | import org.w3c.dom.*;
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| 26 | import java.io.*;
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| 27 | import javax.servlet.*;
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| 28 | import javax.servlet.http.*;
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| 29 | import java.util.Enumeration;
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| 30 | import java.util.HashSet;
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[23913] | 31 | import java.util.Iterator;
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| 32 | import java.util.Map;
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| 33 | import java.util.Map.Entry;
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[14207] | 34 | import java.io.File;
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| 35 |
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| 36 | import org.apache.log4j.*;
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| 37 |
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| 38 | /** a servlet to serve the OAI metadata harvesting - we are using servlets instead
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| 39 | * of cgi
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| 40 | * the init method is called only once - the first time the servlet classes
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| 41 | * are loaded. Each time a request comes in to the servlet, the session()
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| 42 | * method is called in a new thread (calls doGet/doPut etc)
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| 43 | * takes the verb= type args and builds a simple request to send to
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| 44 | * the oai receptionist, which returns a result in xml, conforming to the OAI-PMH
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| 45 | * protocol.
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| 46 | * @see Receptionist
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| 47 | */
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| 48 | /**
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| 49 | * OAI server configuration instructions *
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| 50 | *
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| 51 | */
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| 52 | public class OAIServer extends HttpServlet {
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| 53 |
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| 54 | /** the receptionist to send messages to */
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| 55 | protected OAIReceptionist recept=null;
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| 56 | /** the default language - is specified by setting a servlet param,
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| 57 | * otherwise DEFAULT_LANG is used*/
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| 58 | protected String default_lang= null;
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| 59 | /** The default default - used if a default lang is not specified
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| 60 | * in the servlet params */
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| 61 | protected final String DEFAULT_LANG = "en";
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| 62 |
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| 63 | /** a converter class to parse XML and create Docs
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| 64 | * This is only used for generating internal requests passed to MessageRouter.
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| 65 | * The response message is generated by parsing an existing xml skeleton file (web/WEB-INF/oaixml/oaiversion2.xml, for example).
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| 66 | */
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| 67 | protected XMLConverter converter=null;
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| 68 | /** container Document to create XML Nodes (but only request to the oai receptionist,
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| 69 | * not response (which is created in OAIXML.java) created by converter class */
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| 70 | protected Document doc=null;
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| 71 |
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| 72 | /** A HashSet which contains all the legal verbs. */
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| 73 | protected HashSet verb_set = null;
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| 74 | /** A HashSet which contains all the legal oai keys in the key/value argument pair. */
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| 75 | protected HashSet param_set = null;
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| 76 | /** The name of the site with which we will finally be dealing, whether it is a local site or a remote site through a communicator.*/
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| 77 | protected String site = "";
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| 78 |
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[21779] | 79 | // do we output the stylesheet processing instruction?
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| 80 | protected boolean use_oai_stylesheet = true;
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| 81 | protected String oai_stylesheet = "interfaces/oai/oai2.xsl";
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| 82 |
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[23913] | 83 | // there is no getQueryString() method in the HttpServletRequest returned from doPost,
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| 84 | // since that is actually of type apache RequestFacade, and doesn't define such a method
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| 85 | protected String queryString = null;
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| 86 |
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[14207] | 87 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.OAIServer.class.getName());
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| 88 |
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| 89 | /** initialise the servlet
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| 90 | */
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| 91 | public void init(ServletConfig config) throws ServletException {
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| 92 | // always call super.init, i.e., HttpServlet.;
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| 93 | super.init(config);
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| 94 | this.default_lang = config.getInitParameter(GSConstants.DEFAULT_LANG);
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| 95 |
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| 96 | initVerbs();
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| 97 | initParams();
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| 98 |
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| 99 | String site_name = config.getInitParameter(GSConstants.SITE_NAME);
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| 100 | String remote_site_name = null;
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| 101 | String remote_site_type = null;
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| 102 | String remote_site_address = null;
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| 103 |
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| 104 | if (site_name == null) {
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| 105 | // no local site, try for communicator (remote site)
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| 106 | remote_site_name = config.getInitParameter("remote_site_name");
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| 107 | remote_site_type = config.getInitParameter("remote_site_type");
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| 108 | remote_site_address = config.getInitParameter("remote_site_address");
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| 109 | if (remote_site_name == null || remote_site_type == null || remote_site_address == null) {
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| 110 | System.err.println("initialisation paramters not all set!");
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| 111 | 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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| 112 | System.exit(1);
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| 113 | }
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| 114 | }
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| 115 |
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| 116 | if (this.default_lang == null) {
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| 117 | // choose english
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| 118 | this.default_lang = DEFAULT_LANG;
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| 119 | }
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| 120 |
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| 121 | // the receptionist -the servlet will talk to this
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| 122 | this.recept = new OAIReceptionist();
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| 123 |
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| 124 | // 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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| 125 | if (site_name != null) {
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| 126 | //this site_name could consist of comma separated more than one site name.
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| 127 | String mr_name = (String)config.getInitParameter("messagerouter_class");
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| 128 | MessageRouter message_router = null;
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| 129 | if (mr_name == null) { // just use the normal MR *********
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| 130 | message_router = new MessageRouter();
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| 131 | } else { // try the specified one
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| 132 | try {
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| 133 | message_router = (MessageRouter)Class.forName("org.greenstone.gsdl3.core."+mr_name).newInstance();
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| 134 | } catch (Exception e) { // cant use this new one, so use normal one
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| 135 | System.err.println("OAIServlet configure exception when trying to use a new MessageRouter "+mr_name+": "+e.getMessage());
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| 136 | e.printStackTrace();
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| 137 | message_router = new MessageRouter();
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| 138 | }
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| 139 | }
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| 140 |
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| 141 | message_router.setSiteName(site_name);
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| 142 | // lots of work is done in this step; see MessageRouter.java
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| 143 | message_router.configure();
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| 144 | this.recept.setSiteName(site_name);
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| 145 | this.recept.setMessageRouter(message_router);
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| 146 |
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| 147 | } else {
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| 148 | // talking to a remote site, create a communicator
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| 149 | Communicator communicator = null;
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| 150 | // we need to create the XML to configure the communicator
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| 151 | Element site_elem = this.doc.createElement(GSXML.SITE_ELEM);
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| 152 | site_elem.setAttribute(GSXML.TYPE_ATT, remote_site_type);
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| 153 | site_elem.setAttribute(GSXML.NAME_ATT, remote_site_name);
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| 154 | site_elem.setAttribute(GSXML.ADDRESS_ATT, remote_site_address);
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| 155 |
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| 156 | if (remote_site_type.equals(GSXML.COMM_TYPE_SOAP_JAVA)) {
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| 157 | communicator = new SOAPCommunicator();
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| 158 | } else {
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| 159 | System.err.println("OAIServlet.init Error: invalid Communicator type: "+remote_site_type);
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| 160 | System.exit(1);
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| 161 | }
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| 162 |
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| 163 | if (!communicator.configure(site_elem)) {
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| 164 | System.err.println("OAIServlet.init Error: Couldn't configure communicator");
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| 165 | System.exit(1);
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| 166 | }
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| 167 | this.recept.setSiteName(remote_site_name);
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| 168 | this.recept.setMessageRouter(communicator);
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| 169 | }
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| 170 | // used for composing internal xml requests, but not xml responses.
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| 171 | // the converter may be used to get pretty xml, though.
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| 172 | this.converter = new XMLConverter();
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| 173 | this.doc = this.converter.newDOM();
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| 174 |
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| 175 | // Read in OAIConfig.xml (residing web/WEB-INF/classes/) and
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| 176 | //use it to configure the receptionist. The init() is also called in which
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| 177 | //the resumption token file is read in and all expired tokens cleared.
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| 178 | Element oai_config = OAIXML.getOAIConfigXML();
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| 179 | if (oai_config == null) {
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| 180 | logger.error("Fail to parse oai config file OAIConfig.xml.");
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| 181 | return;
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| 182 | }
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| 183 | // pass it to the receptionist
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| 184 | this.recept.configure(oai_config);
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| 185 |
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[21779] | 186 | // also, we have something we want to get from here - useOAIStylesheet
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| 187 | this.configure(oai_config);
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[14207] | 188 | }//end of init()
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| 189 |
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[21779] | 190 | private void configure(Element oai_config) {
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| 191 | Element use_stylesheet_elem = (Element)GSXML.getChildByTagName(oai_config, OAIXML.USE_STYLESHEET);
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| 192 | if (use_stylesheet_elem != null) {
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| 193 | String value = GSXML.getNodeText(use_stylesheet_elem);
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| 194 | if (value.equals("no")) {
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| 195 | this.use_oai_stylesheet = false;
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| 196 | }
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| 197 | }
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| 198 | if (this.use_oai_stylesheet) {
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| 199 | // now see if there is a custom stylesheet specified
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| 200 | Element stylesheet_elem = (Element)GSXML.getChildByTagName(oai_config, OAIXML.STYLESHEET);
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| 201 | if (stylesheet_elem != null) {
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| 202 | String value = GSXML.getNodeText(stylesheet_elem);
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| 203 | if (!value.equals("")) {
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| 204 | oai_stylesheet = value;
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| 205 | }
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| 206 | }
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| 207 |
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| 208 | }
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| 209 | }
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[14207] | 210 | private void initVerbs() {
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| 211 | verb_set = new HashSet();
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| 212 | verb_set.add(OAIXML.GET_RECORD);
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| 213 | verb_set.add(OAIXML.LIST_RECORDS);
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| 214 | verb_set.add(OAIXML.LIST_IDENTIFIERS);
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| 215 | verb_set.add(OAIXML.LIST_SETS);
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| 216 | verb_set.add(OAIXML.LIST_METADATA_FORMATS);
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| 217 | verb_set.add(OAIXML.IDENTIFY);
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| 218 | }
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| 219 |
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| 220 | private void initParams() {
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| 221 | param_set = new HashSet();
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| 222 | param_set.add(OAIXML.METADATA_PREFIX);
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| 223 | param_set.add(OAIXML.FROM);
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| 224 | param_set.add(OAIXML.UNTIL);
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| 225 | param_set.add(OAIXML.SET);
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| 226 | param_set.add(OAIXML.RESUMPTION_TOKEN);
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| 227 | param_set.add(OAIXML.IDENTIFIER);
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| 228 | }
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| 229 | private void logUsageInfo(HttpServletRequest request){
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| 230 | String usageInfo = "";
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| 231 |
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[23913] | 232 | String query = (queryString == null) ? request.getQueryString() : queryString;
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| 233 |
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[14207] | 234 | //logged info = general-info + session-info
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| 235 | usageInfo =
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| 236 | request.getContextPath()+" "+ //session id
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| 237 | request.getServletPath()+" "+ //serlvet
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[23913] | 238 | "["+query+"]" +" "+ //the query string
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[14207] | 239 | "["+usageInfo.trim()+"]" +" "+ // params stored in a session
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| 240 | request.getRemoteAddr()+" "+ //remote address
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| 241 | request.getHeader("user-agent")+" "; //the remote brower info
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| 242 |
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| 243 | logger.info(usageInfo);
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| 244 | }
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| 245 | /** return true if the url is in the form of baseURL?verb=...,
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| 246 | */
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| 247 | private boolean validate(String query, String verb) {
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| 248 | //Here in OAIServer, only the verbs are validated. All the validation for individual verb
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| 249 | // is taken in their doXXX() methods.
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| 250 | if(query == null || !query.startsWith(OAIXML.VERB+"=")) {
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| 251 | return false;
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| 252 | }
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| 253 | if (!verb_set.contains(verb)) {
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| 254 | return false;
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| 255 | }
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| 256 | return true;
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| 257 | }
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| 258 | private String getVerb(String query) {
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| 259 | if (query == null) return "";
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| 260 | int verb_start_index = query.indexOf("=") + 1;// first occurence of '='
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| 261 | int verb_end_index = query.indexOf("&");
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| 262 | if(verb_end_index == -1) {
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| 263 | return query.substring(verb_start_index);
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| 264 | }
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| 265 | return query.substring(verb_start_index, verb_end_index);
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| 266 | }
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[23913] | 267 |
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[14207] | 268 | public void doGet(HttpServletRequest request, HttpServletResponse response)
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| 269 | throws ServletException, IOException {
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| 270 | logUsageInfo(request);
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| 271 | //out.println("url="+request.getRequestURL());// /oaiserver
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| 272 | //out.println("query="+request.getQueryString());// is /greenstone3
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| 273 |
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| 274 | // oai always requires the content type be text/xml
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| 275 | request.setCharacterEncoding("UTF-8");
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| 276 | response.setContentType("text/xml;charset=UTF-8");
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[21802] | 277 | PrintWriter out = response.getWriter();
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[14207] | 278 |
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| 279 | //
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| 280 | String lang = request.getParameter(GSParams.LANGUAGE);
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| 281 | if (lang==null || lang.equals("")) {
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| 282 | // use the default
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| 283 | lang = this.default_lang;
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| 284 | }
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| 285 | //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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| 286 | //For example, puka.cs.waikato.ac.nz vs www.greenstone.org
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| 287 | //String base_url = request.getRequestURL().toString();
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[23913] | 288 | // if called by doPost (if this was originally a POST request), var queryString would have been set
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| 289 | String query = (queryString == null) ? request.getQueryString() : queryString;
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[23922] | 290 | queryString = null; // reset member variable, else no doGet will work as long as the server remains running
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| 291 |
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[14207] | 292 | String[] pairs = (query==null)? null : query.split("&");//split into key/value pairs
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| 293 | String verb = getVerb(query);
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| 294 | Element xml_response = OAIXML.createBasicResponse(verb, pairs);
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| 295 | Element verb_elem = null;
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| 296 |
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| 297 | if (validate(query, verb) == false) {
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| 298 | if (verb_set.contains(verb) == false) {
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| 299 | logger.error(OAIXML.BAD_VERB + ": " + query);
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| 300 | verb_elem = OAIXML.createErrorElement(OAIXML.BAD_VERB, OAIXML.ILLEGAL_OAI_VERB);
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| 301 | } else {
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| 302 | //must be something else other than bad verbs caused an error, so bad argument
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| 303 | logger.error(OAIXML.BAD_ARGUMENT + ": " + query);
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| 304 | verb_elem = OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, "");
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| 305 | }
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| 306 | xml_response.appendChild(verb_elem);
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[21779] | 307 |
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| 308 | out.println("<?xml version='1.0' encoding='UTF-8' ?>");
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| 309 | if (this.use_oai_stylesheet) {
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| 310 | out.println("<?xml-stylesheet type='text/xsl' href='"+this.oai_stylesheet+"' ?>\n");
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| 311 | }
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[14207] | 312 | out.println(this.converter.getPrettyString(xml_response));
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| 313 | return;
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| 314 | }//end of if(validate
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| 315 |
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| 316 | // The query is valid, we can now
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| 317 | // compose the request message to the receptionist
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| 318 | Element xml_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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| 319 | Element xml_request = this.doc.createElement(GSXML.REQUEST_ELEM);
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| 320 | // The type attribute is set to be 'oaiService' from OAIServer to OAIReceptionist.
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| 321 | //xml_request.setAttribute(GSXML.TYPE_ATT, OAIXML.OAI_SERVICE);
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| 322 | xml_request.setAttribute(GSXML.LANG_ATT, lang);
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| 323 | xml_request.setAttribute(GSXML.TO_ATT, verb);
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| 324 | addParams(xml_request, pairs);
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| 325 |
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| 326 | //xml_request.setAttribute(GSXML.OUTPUT_ATT, output);????
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| 327 | xml_message.appendChild(xml_request);
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| 328 |
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[16688] | 329 | Node xml_result = this.recept.process (xml_message);
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[14207] | 330 | if (xml_result == null) {
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| 331 | logger.info("xml_result is null");
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| 332 | verb_elem = OAIXML.createErrorElement("Internal error", "");
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| 333 | xml_response.appendChild(verb_elem);
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| 334 | } else {
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| 335 |
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| 336 | /** All response elements are in the form (with a corresponding verb name):
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| 337 | * <message>
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| 338 | <response>
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| 339 | <verb>
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| 340 | ...
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| 341 | * <resumptionToken>
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| 342 | * .. this is optional!
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| 343 | * </resumptionToken>
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| 344 | * </verb>
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| 345 | * </response>
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| 346 | * </message>
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| 347 | */
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| 348 | Node res = GSXML.getChildByTagName(xml_result, OAIXML.RESPONSE);
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| 349 | if(res == null) {
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| 350 | logger.info("response element in xml_result is null");
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| 351 | verb_elem = OAIXML.createErrorElement("Internal error", "");
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| 352 | } else {
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[14227] | 353 | verb_elem = GSXML.getFirstElementChild(res);
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[14207] | 354 | }
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| 355 |
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| 356 | if(OAIXML.oai_version.equals(OAIXML.OAI_VERSION2) ||
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| 357 | verb_elem.getTagName().equals(OAIXML.ERROR)) {
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| 358 | xml_response.appendChild(xml_response.getOwnerDocument().importNode(verb_elem, true));
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| 359 | } else {
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| 360 | GSXML.copyAllChildren(xml_response, verb_elem);
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| 361 | }
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| 362 | }
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[21779] | 363 | out.println("<?xml version='1.0' encoding='UTF-8' ?>");
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| 364 | if (this.use_oai_stylesheet) {
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| 365 | out.println("<?xml-stylesheet type='text/xsl' href='"+this.oai_stylesheet+"' ?>\n");
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| 366 | }
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[14207] | 367 | out.println (this.converter.getPrettyString (xml_response));
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| 368 | return;
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| 369 | }
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| 370 | /** append parameter elements to the request sent to the receptionist*/
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| 371 | public void addParams(Element request, String[] pairs) {
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| 372 | // no params apart from the verb
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| 373 | if (pairs == null || pairs.length < 2) return ;
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| 374 |
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| 375 | /**the request xml is composed in the form: <request>
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| 376 | * <param name=.../>
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| 377 | * <param name=.../>
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| 378 | * </request>
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| 379 | *(No paramList element in between).
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| 380 | */
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| 381 | for (int i=1; i<pairs.length; i++) {
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| 382 | //the first pair in pairs is the verb=xxx
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| 383 | int index = pairs[i].indexOf("=");
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| 384 | if(index != -1){ //just a double check
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| 385 | Element param = this.doc.createElement(OAIXML.PARAM);
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| 386 | param.setAttribute(OAIXML.NAME, pairs[i].substring(0, index));
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| 387 | param.setAttribute(OAIXML.VALUE, OAIXML.oaiDecode(pairs[i].substring(index + 1)));
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| 388 | request.appendChild(param);
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| 389 | }
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| 390 | }
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| 391 | }
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[23913] | 392 |
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| 393 | // For OAI version 2.0, validation tests indicated that POST needs to be supported. Some
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| 394 | // modification was required in order to ensure that the request is passed intact to doGet()
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[14207] | 395 | public void doPost(HttpServletRequest request,
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| 396 | HttpServletResponse response)
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| 397 | throws ServletException, IOException {
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[23913] | 398 |
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| 399 | // the post method returns a wrapper of type RequestFacade by apache and there
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| 400 | // is no getQueryString() method defined for it. Therefore, need to work this out
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| 401 | // manually before calling doGet(request, response) so that doGet can work as before.
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| 402 |
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| 403 | queryString = "";
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| 404 | Iterator parameter_entries = request.getParameterMap().entrySet().iterator();
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| 405 | while(parameter_entries.hasNext()) {
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| 406 | Map.Entry param_entry = (Map.Entry)parameter_entries.next();
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| 407 | String[] paramVals = (String[]) param_entry.getValue();
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| 408 | if(paramVals != null) {
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| 409 | if(paramVals.length > 0) {
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| 410 | logger.error("POST request received: " + param_entry.getKey() + " - " + paramVals[0]);
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| 411 | queryString = queryString + "&" + param_entry.getKey() + "=" + paramVals[0];
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| 412 | }
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| 413 | }
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| 414 | }
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| 415 | if(queryString.length() > 0) {
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| 416 | queryString = queryString.substring(1);
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[23922] | 417 | //queryString = OAIXML.oaiEncode(queryString);
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[23913] | 418 | }
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| 419 | if(queryString.equals("")) {
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| 420 | queryString = null;
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| 421 | }
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[14207] | 422 | doGet(request,response);
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| 423 | }
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| 424 | }
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| 425 |
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| 426 |
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| 427 |
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