1 | /*
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2 | * SOAPCommunicator.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.comms;
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20 |
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21 | import org.greenstone.util.GlobalProperties;
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22 | import org.greenstone.gsdl3.util.*;
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23 | import org.greenstone.gsdl3.core.*;
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24 |
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25 | // classes needed for SOAP stuff
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26 | import java.net.URL;
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27 | import java.net.MalformedURLException;
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28 | import java.util.Vector;
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29 | import org.apache.axis.client.Call;
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30 | import org.apache.axis.client.Service;
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31 | import org.apache.axis.message.SOAPBodyElement;
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32 | import javax.xml.namespace.QName;
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33 |
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34 | import org.w3c.dom.Node;
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35 | import org.w3c.dom.NodeList;
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36 | import org.w3c.dom.Document;
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37 | import org.w3c.dom.Element;
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38 |
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39 | import org.apache.log4j.*;
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40 |
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41 | /*
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42 | * The Client side of a SOAP Connection
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43 | *
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44 | * @author Katherine Don
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45 | * @version $Revision: 28966 $
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46 | * @see <a href="http://www.w3.org/TR/SOAP/">Simple Object Access Protocol (SOAP) 1.1 </a>
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47 | */
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48 | public class SOAPCommunicator
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49 | extends Communicator {
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50 |
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51 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.comms.SOAPCommunicator.class.getName());
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52 |
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53 | /** address of site to connect to */
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54 | protected String remote_site_address_=null;
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55 |
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56 | /** the call object that does the SOAP talking */
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57 | private Call call_ = null;
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58 |
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59 | /** The no-args constructor */
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60 | public SOAPCommunicator() {
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61 | }
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62 |
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63 | public boolean configure(Element site_elem) {
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64 |
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65 | String type = site_elem.getAttribute(GSXML.TYPE_ATT);
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66 | if (!type.equals(GSXML.COMM_TYPE_SOAP_JAVA)) {
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67 | logger.error("wrong type of site");
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68 | return false;
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69 | }
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70 | remote_site_name_ = site_elem.getAttribute(GSXML.NAME_ATT);
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71 | if (remote_site_name_.equals("")) {
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72 | logger.error("must have name attribute in site element");
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73 | return false;
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74 | }
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75 | remote_site_address_ = site_elem.getAttribute(GSXML.ADDRESS_ATT);
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76 | String local_site_name = site_elem.getAttribute(GSXML.LOCAL_SITE_ATT);
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77 | if (remote_site_address_.equals("") && local_site_name.equals("")) {
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78 | logger.error("must have address or localSite attributes in site element");
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79 | return false;
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80 | }
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81 | if (remote_site_address_.equals("")) {
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82 | remote_site_address_ = GlobalProperties.getGSDL3WebAddress()+"/services/"+local_site_name;
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83 | }
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84 |
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85 | try {
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86 | Service service = new Service();
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87 | call_ = (Call) service.createCall();
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88 | call_.setTargetEndpointAddress( new java.net.URL(remote_site_address_) );
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89 | } catch (Exception e) {
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90 | logger.error("SOAPCommunicator.configure() Error: Exception occurred "+e);
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91 | return false;
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92 | }
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93 | return true;
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94 | }
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95 |
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96 | public Node process(Node message_node) {
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97 |
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98 | Element message = GSXML.nodeToElement(message_node);
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99 |
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100 | NodeList requests = message.getElementsByTagName(GSXML.REQUEST_ELEM);
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101 | if (requests.getLength()==0) {
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102 | // no requests
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103 | return null;
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104 | }
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105 |
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106 | // if the communicator is part of a site, it needs to edit the to and from fields, otherwise it just passes the message on, as is
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107 | // for now, use local_site_name_ as the flag.
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108 | if (local_site_name_!=null) { // no local site
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109 |
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110 | for (int i=0;i<requests.getLength(); i++) {
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111 | Element e = (Element)requests.item(i);
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112 | String to = e.getAttribute(GSXML.TO_ATT);
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113 | to = GSPath.removeFirstLink(to); // remove the server name, should check that it is present
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114 | e.setAttribute(GSXML.TO_ATT, to);
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115 | String from = e.getAttribute(GSXML.FROM_ATT);
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116 | from = GSPath.appendLink(from, local_site_name_);
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117 | e.setAttribute(GSXML.FROM_ATT, from);
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118 | }
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119 | }
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120 | // else do nothing to the requests, just pass it on
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121 |
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122 | // the soap impl needs a namespace for the top level element
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123 | Element message_to_send = message;
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124 | if (message.getNamespaceURI() == null) {
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125 | message_to_send = GSXML.duplicateWithNewNameNS(message.getOwnerDocument(), message, "gs3:"+message.getTagName(), "urn:foo", true);
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126 | }
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127 |
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128 | // do the soap query
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129 | Element result = null;
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130 | try {
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131 | SOAPBodyElement[] input = new SOAPBodyElement[1];
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132 | input[0] = new SOAPBodyElement(message_to_send);
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133 | Vector output = (Vector) call_.invoke( input );
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134 | SOAPBodyElement elem = (SOAPBodyElement) output.get(0);
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135 | result = elem.getAsDOM();
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136 | } catch (Exception e) {
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137 | e.printStackTrace();
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138 | return null;
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139 | }
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140 |
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141 | if (local_site_name_ != null) {// have to modify the from field
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142 |
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143 | NodeList responses = result.getElementsByTagName(GSXML.RESPONSE_ELEM);
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144 | for (int i=0;i<responses.getLength(); i++) {
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145 | Element e = (Element)responses.item(i);
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146 | String from = e.getAttribute(GSXML.FROM_ATT);
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147 | from = GSPath.prependLink(from, remote_site_name_);
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148 | e.setAttribute(GSXML.FROM_ATT, from);
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149 | }
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150 | } // else return as is
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151 |
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152 | return result;
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153 | }
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154 |
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155 | public static void main (String [] args) {
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156 | SOAPCommunicator comm = new SOAPCommunicator();
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157 | XMLConverter converter = new XMLConverter();
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158 | String message = "<site name=\"localsite\" address=\"http://kanuka.cs.waikato.ac.nz:7070/axis/services/localsite\" type=\"soap\"/>";
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159 | Element site_elem = converter.getDOM(message).getDocumentElement();
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160 | comm.configure(site_elem);
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161 | message = "<message><request type=\"describe\" to=\"\" lang=\"en\"/></message>";
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162 | Element request_elem = converter.getDOM(message).getDocumentElement();
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163 | Node response = comm.process(request_elem);
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164 |
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165 | logger.error("response was "+converter.getPrettyString(response));
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166 | }
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167 | }
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168 |
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169 |
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170 |
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171 |
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172 |
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173 |
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174 |
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175 |
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