1 | package org.greenstone.gsdl3.core;
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2 |
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3 | import org.greenstone.gsdl3.util.*;
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4 | import org.greenstone.gsdl3.action.*;
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5 | // XML classes
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6 | import org.w3c.dom.Node;
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7 | import org.w3c.dom.NodeList;
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8 | import org.w3c.dom.Document;
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9 | import org.w3c.dom.Element;
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10 |
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11 | // other java classes
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12 | import java.io.File;
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13 | import java.util.*;
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14 |
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15 | import org.apache.log4j.*;
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16 |
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17 | /** a Receptionist, used for oai metadata response xml generation.
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18 | * This receptionist talks to the message router directly,
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19 | * instead of via any action, hence no action map is needed.
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20 | * @see the basic Receptionist
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21 | */
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22 | public class OAIReceptionist implements ModuleInterface {
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23 |
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24 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.core.OAIReceptionist.class.getName());
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25 |
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26 | /** Instead of a config_params object, only a site_name is needed by oai receptionist. */
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27 | protected String site_name = null;
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28 | /** container Document to create XML Nodes for requests sent to message router
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29 | * Not used for response
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30 | */
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31 | protected Document doc=null;
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32 |
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33 | /** a converter class to parse XML and create Docs */
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34 | protected XMLConverter converter=null;
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35 |
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36 | /** the configure file of this receptionist passed from the oai servlet. */
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37 | protected Element oai_config = null;
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38 |
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39 | /** contained in the OAIConfig.xml deciding whether the resumptionToken should be in use */
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40 | protected int resume_after = -1 ;
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41 |
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42 | /** the message router that the Receptionist and Actions will talk to */
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43 | protected ModuleInterface mr = null;
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44 |
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45 | public OAIReceptionist() {
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46 | this.converter = new XMLConverter();
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47 | this.doc = this.converter.newDOM();
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48 |
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49 | }
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50 |
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51 | public void cleanUp() {}
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52 |
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53 | public void setSiteName(String site_name) {
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54 | this.site_name = site_name;
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55 | }
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56 | /** sets the message router - it should already be created and
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57 | * configured in the init() of a servlet (OAIServer, for example) before being passed to the receptionist*/
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58 | public void setMessageRouter(ModuleInterface mr) {
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59 | this.mr = mr;
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60 | }
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61 |
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62 | /** configures the receptionist */
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63 | public boolean configure(Element config) {
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64 |
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65 | if (this.mr==null) {
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66 | logger.error(" message routers must be set before calling oai configure");
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67 | return false;
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68 | }
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69 | if (config == null) {
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70 | logger.error(" oai configure file is null");
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71 | return false;
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72 | }
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73 | oai_config = config;
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74 | resume_after = getResumeAfter();
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75 |
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76 | //clear out expired resumption tokens stored in OAIResumptionToken.xml
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77 | OAIXML.init();
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78 | OAIXML.clearExpiredTokens();
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79 |
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80 | return true;
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81 | }
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82 | /** process using strings - just calls process using Elements */
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83 | public String process(String xml_in) {
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84 |
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85 | Node message_node = this.converter.getDOM(xml_in);
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86 | Node page = process(message_node);
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87 | return this.converter.getString(page);
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88 | }
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89 |
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90 | //Compose a message element used to send back to the OAIServer servlet.
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91 | //This method is only used within OAIReceptionist
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92 | private Element getMessage(Element e) {
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93 | Element msg = OAIXML.createElement(OAIXML.MESSAGE);
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94 | msg.appendChild(OAIXML.getResponse(e));
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95 | return msg;
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96 | }
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97 | /** process - produce xml data in response to a request
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98 | * if something goes wrong, it returns null -
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99 | */
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100 | public Node process(Node message_node) {
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101 | logger.error("OAIReceptionist received request");
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102 |
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103 | Element message = this.converter.nodeToElement(message_node);
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104 | logger.error(this.converter.getString(message));
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105 |
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106 | // check that its a correct message tag
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107 | if (!message.getTagName().equals(GSXML.MESSAGE_ELEM)) {
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108 | logger.error(" Invalid message. GSDL message should start with <"+GSXML.MESSAGE_ELEM+">, instead it starts with:"+message.getTagName()+".");
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109 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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110 | }
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111 |
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112 | // get the request out of the message - assume that there is only one
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113 | Element request = (Element)GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);
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114 | if (request == null) {
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115 | logger.error(" message had no request!");
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116 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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117 | }
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118 | //At this stage, the value of 'to' attribute of the request must be the 'verb'
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119 | //The only thing that the oai receptionist can be sure is that these verbs are valid, nothing else.
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120 | String verb = request.getAttribute(GSXML.TO_ATT);
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121 | if (verb.equals(OAIXML.IDENTIFY)) {
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122 | return doIdentify();
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123 | }
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124 | if (verb.equals(OAIXML.LIST_METADATA_FORMATS)) {
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125 | return doListMetadataFormats(message);
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126 | }
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127 | if (verb.equals(OAIXML.LIST_SETS)) {
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128 | return doListSets(message);
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129 | }
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130 | if (verb.equals(OAIXML.GET_RECORD)) {
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131 | return doGetRecord(message);
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132 | }
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133 | if (verb.equals(OAIXML.LIST_IDENTIFIERS)) {
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134 | return doListIdentifiers(message);
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135 | }
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136 | if (verb.equals(OAIXML.LIST_RECORDS)) {
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137 | return doListRecords(message);
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138 | }
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139 | return getMessage(OAIXML.createErrorElement("Unexpected things happened", ""));
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140 |
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141 | }
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142 | /** send a request to the message router asking for a list of collections that support oai
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143 | * The type attribute must be changed from 'oaiService' to 'oaiSetList'
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144 | */
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145 | private NodeList getOAICollectionList() {
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146 | Element message = this.doc.createElement(OAIXML.MESSAGE);
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147 | Element request = this.doc.createElement(OAIXML.REQUEST);
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148 | message.appendChild(request);
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149 | request.setAttribute(OAIXML.TYPE, OAIXML.OAI_SET_LIST);
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150 | request.setAttribute(OAIXML.TO, "");
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151 | Node msg_node = mr.process(message);
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152 |
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153 | if (msg_node == null) {
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154 | logger.error("returned msg_node from mr is null");
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155 | return null;
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156 | }
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157 | Element resp = (Element)GSXML.getChildByTagName(msg_node, OAIXML.RESPONSE);
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158 | Element coll_list = (Element)GSXML.getChildByTagName(resp, OAIXML.COLLECTION_LIST);
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159 | if (coll_list == null) {
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160 | logger.error("coll_list is null");
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161 | return null;
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162 | }
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163 | //logger.info(GSXML.xmlNodeToString(coll_list));
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164 | NodeList list = coll_list.getElementsByTagName(OAIXML.COLLECTION);
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165 | int length = list.getLength();
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166 | if (length == 0) {
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167 | logger.error("length is 0");
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168 | return null;
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169 | }
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170 | return list;
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171 | }
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172 | /**Exclusively called by doListSets()*/
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173 | private void getSets(Element list_sets_elem, NodeList oai_coll, int start_point, int end_point) {
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174 | for (int i=start_point; i<end_point; i++) {
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175 | String coll_spec = ((Element)oai_coll.item(i)).getAttribute(OAIXML.NAME);
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176 | String coll_name = coll_spec.substring(coll_spec.indexOf(":") + 1);
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177 | Element set = OAIXML.createElement(OAIXML.SET);
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178 | Element set_spec = OAIXML.createElement(OAIXML.SET_SPEC);
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179 | GSXML.setNodeText(set_spec, coll_spec);
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180 | set.appendChild(set_spec);
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181 | Element set_name = OAIXML.createElement(OAIXML.SET_NAME);
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182 | GSXML.setNodeText(set_name, coll_name);
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183 | set.appendChild(set_name);
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184 | list_sets_elem.appendChild(set);
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185 | }
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186 | }
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187 | private int getResumeAfter() {
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188 | Element resume_after = (Element)GSXML.getChildByTagName(oai_config, OAIXML.RESUME_AFTER);
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189 | if(resume_after != null) return Integer.parseInt(GSXML.getNodeText(resume_after));
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190 | return -1;
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191 | }
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192 | /** method to compose a set element
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193 | */
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194 | private Element doListSets(Element msg){
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195 | logger.info("");
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196 | // option: resumptionToken
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197 | // exceptions: badArgument, badResumptionToken, noSetHierarchy
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198 | Element list_sets_elem = OAIXML.createElement(OAIXML.LIST_SETS);
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199 |
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200 | //ask the message router for a list of oai collections
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201 | NodeList oai_coll = getOAICollectionList();
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202 | int oai_coll_size = oai_coll.getLength();
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203 | if (oai_coll_size == 0) {
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204 | return getMessage(list_sets_elem);
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205 | }
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206 |
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207 | Element req = (Element)GSXML.getChildByTagName(msg, GSXML.REQUEST_ELEM);
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208 | if (req == null) {
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209 | logger.error("req is null");
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210 | return null;
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211 | }
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212 | //params list only contains the parameters other than the verb
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213 | NodeList params = GSXML.getChildrenByTagName(req, OAIXML.PARAM);
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214 | Element param = null;
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215 | int smaller = (oai_coll_size>resume_after)? resume_after : oai_coll_size;
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216 | if (params.getLength() > 1) {
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217 | //Bad argument. Can't be more than one parameters for ListMetadataFormats verb
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218 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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219 | }
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220 | if(params.getLength() == 0) {
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221 | //this is requesting a list of sets in the whole repository
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222 | /** there is no resumeptionToken in the request, we check whether we need
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223 | * to send out resumeptionToken by comparing the total number of sets in this
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224 | * repository and the specified value of resumeAfter
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225 | */
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226 | if(resume_after < 0 || oai_coll_size <= resume_after) {
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227 | //send the whole list of records
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228 | //all data are sent on the first request. Therefore there should be
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229 | //no resumeptionToken stored in OAIConfig.xml.
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230 | //As long as the verb is 'ListSets', we ignore the rest of the parameters
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231 | getSets(list_sets_elem, oai_coll, 0, oai_coll_size);
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232 | return getMessage(list_sets_elem);
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233 | }
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234 |
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235 | //append required sets to list_sets_elem (may be a complete or incomplete list)
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236 | getSets(list_sets_elem, oai_coll, 0, smaller);
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237 |
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238 | if(oai_coll_size > resume_after) {
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239 | //An incomplete list is sent; append a resumptionToken element
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240 | Element token = createResumptionTokenElement(oai_coll_size, 0, resume_after, true);
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241 | //store this token
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242 | OAIXML.addToken(token);
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243 |
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244 | list_sets_elem.appendChild(token);
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245 | }
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246 |
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247 | return getMessage(list_sets_elem);
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248 | }
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249 |
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250 | // The url should contain only one param called resumptionToken
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251 | // This is requesting a subsequent part of a list, following a previously sent incomplete list
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252 | param = (Element)params.item(0);
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253 | String param_name = param.getAttribute(OAIXML.NAME);
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254 | if (!param_name.equals(OAIXML.RESUMPTION_TOKEN)) {
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255 | //Bad argument
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256 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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257 | }
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258 | //get the token
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259 | String token = param.getAttribute(OAIXML.VALUE);
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260 | //validate the token string (the string has already been decoded in OAIServer, e.g.,
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261 | // replace %3A with ':')
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262 | if(OAIXML.containsToken(token) == false) {
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263 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_RESUMPTION_TOKEN, ""));
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264 | }
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265 | //take out the cursor value, which is the size of previously sent list
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266 | int index = token.indexOf(":");
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267 | int cursor = Integer.parseInt(token.substring(index + 1));
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268 | Element token_elem = null;
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269 |
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270 | // are we sending the final part of a complete list?
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271 | if(cursor + resume_after >= oai_coll_size) {
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272 | //Yes, we are.
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273 | //append required sets to list_sets_elem (list is complete)
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274 | getSets(list_sets_elem, oai_coll, cursor, oai_coll_size);
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275 | //An incomplete list is sent; append a resumptionToken element
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276 | token_elem = createResumptionTokenElement(oai_coll_size, cursor, -1, false);
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277 | list_sets_elem.appendChild(token_elem);
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278 | } else {
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279 | //No, we are not.
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280 | //append required sets to list_sets_elem (list is incomplete)
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281 | getSets(list_sets_elem, oai_coll, cursor, cursor + resume_after);
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282 | token_elem = createResumptionTokenElement(oai_coll_size, cursor, cursor + resume_after, true);
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283 | //store this token
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284 | OAIXML.addToken(token_elem);
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285 | list_sets_elem.appendChild(token_elem);
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286 | }
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287 | return getMessage(list_sets_elem);
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288 | }
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289 | private Element createResumptionTokenElement(int total_size, int cursor, int so_far_sent, boolean set_expiration, String metadata_prefix) {
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290 | Element token = OAIXML.createElement(OAIXML.RESUMPTION_TOKEN);
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291 | token.setAttribute(OAIXML.COMPLETE_LIST_SIZE, "" + total_size);
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292 | token.setAttribute(OAIXML.CURSOR, "" + cursor);
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293 |
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294 | if(set_expiration) {
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295 | /** read the resumptionTokenExpiration element in OAIConfig.xml and get the specified time value
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296 | * Use the time value plus the current system time to get the expiration date string.
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297 | */
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298 | String expiration_date = OAIXML.getTime(System.currentTimeMillis() + OAIXML.getTokenExpiration()); // in milliseconds
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299 | token.setAttribute(OAIXML.EXPIRATION_DATE, expiration_date);
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300 | }
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301 |
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302 | if(so_far_sent > 0) {
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303 | //the format of resumptionToken is not defined by the OAI-PMH and should be
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304 | //considered opaque by the harvester (in other words, strictly follow what the
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305 | //data provider has to offer
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306 | //Here, we make use of the uniqueness of the system time
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307 | String tokenValue = OAIXML.GS3OAI + System.currentTimeMillis() + ":" + so_far_sent;
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308 | if(!metadata_prefix.equals("")) {
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309 | tokenValue = tokenValue + ":" + metadata_prefix;
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310 | }
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311 | GSXML.setNodeText(token, tokenValue);
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312 | }
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313 | return token;
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314 | }
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315 |
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316 | private Element createResumptionTokenElement(int total_size, int cursor, int so_far_sent, boolean set_expiration) {
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317 | return createResumptionTokenElement(total_size, cursor, so_far_sent, set_expiration, ""); // empty metadata_prefix
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318 | }
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319 |
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320 | /** if the param_map contains strings other than those in valid_strs, return false;
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321 | * otherwise true.
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322 | */
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323 | private boolean isValidParam(HashMap param_map, HashSet valid_strs) {
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324 | ArrayList param_list = new ArrayList(param_map.keySet());
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325 | for(int i=0; i<param_list.size(); i++) {
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326 | if (valid_strs.contains((String)param_list.get(i)) == false) {
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327 | return false;
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328 | }
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329 | }
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330 | return true;
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331 | }
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332 | private Element doListIdentifiers(Element msg) {
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333 | // option: from, until, set, metadataPrefix, resumptionToken
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334 | // exceptions: badArgument, badResumptionToken, cannotDisseminateFormat, noRecordMatch, and noSetHierarchy
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335 | HashSet valid_strs = new HashSet();
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336 | valid_strs.add(OAIXML.FROM);
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337 | valid_strs.add(OAIXML.UNTIL);
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338 | valid_strs.add(OAIXML.SET);
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339 | valid_strs.add(OAIXML.METADATA_PREFIX);
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340 | valid_strs.add(OAIXML.RESUMPTION_TOKEN);
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341 |
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342 | Element list_identifiers = OAIXML.createElement(OAIXML.LIST_IDENTIFIERS);
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343 | Element req = (Element)GSXML.getChildByTagName(msg, GSXML.REQUEST_ELEM);
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344 | if (req == null) { logger.error("req is null"); return null; }
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345 | NodeList params = GSXML.getChildrenByTagName(req, OAIXML.PARAM);
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346 | String coll_name = "";
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347 | String token = "";
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348 |
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349 | HashMap param_map = OAIXML.getParamMap(params);
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350 | if (!isValidParam(param_map, valid_strs)) {
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351 | logger.error("One of the params is invalid");
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352 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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353 | }
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354 | // param keys are valid, but if there are any date params, check they're of the right format
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355 | String from = (String)param_map.get(OAIXML.FROM);
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356 | if(from != null) {
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357 | Date from_date = OAIXML.getDate(from);
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358 | if(from_date == null) {
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359 | logger.error("invalid date: " + from);
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360 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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361 | }
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362 | }
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363 | String until = (String)param_map.get(OAIXML.UNTIL);
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364 | if(until != null) {
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365 | Date until_date = OAIXML.getDate(until);
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366 | if(until_date == null) {
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367 | logger.error("invalid date: " + until);
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368 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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369 | }
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370 | }
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371 | if(from != null && until != null) { // check they are of the same date-time format (granularity)
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372 | if(from.length() != until.length()) {
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373 | logger.error("The request has different granularities (date-time formats) for the From and Until date parameters.");
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374 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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375 | }
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376 | }
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377 |
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378 | //ask the message router for a list of oai collections
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379 | NodeList oai_coll = getOAICollectionList();
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380 | int oai_coll_size = oai_coll.getLength();
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381 | if (oai_coll_size == 0) {
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382 | logger.info("returned oai collection list is empty");
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383 | return getMessage(OAIXML.createErrorElement(OAIXML.NO_RECORDS_MATCH, ""));
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384 | }
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385 |
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386 | //Now we check if the optional argument 'set' has been specified in the params; if so,
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387 | //whether the specified setSpec is supported by this repository
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388 | boolean request_set = param_map.containsKey(OAIXML.SET);
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389 | if(request_set == true) {
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390 | boolean set_supported = false;
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391 | String set_spec_str = (String)param_map.get(OAIXML.SET);
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392 | // get the collection name
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393 | //if setSpec is supported by this repository, it must be in the form: site_name:coll_name
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394 | String[] strs = splitSetSpec(set_spec_str);
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395 | coll_name = strs[1];
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396 |
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397 | for(int i=0; i<oai_coll_size; i++) {
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398 | if(set_spec_str.equals(((Element)oai_coll.item(i)).getAttribute(OAIXML.NAME))) {
|
---|
399 | set_supported = true;
|
---|
400 | }
|
---|
401 | }
|
---|
402 | if(set_supported == false) {
|
---|
403 | logger.error("requested set is not found in this repository");
|
---|
404 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
405 | }
|
---|
406 | }
|
---|
407 |
|
---|
408 | //Is there a resumptionToken included which is requesting an incomplete list?
|
---|
409 | if(param_map.containsKey(OAIXML.RESUMPTION_TOKEN)) {
|
---|
410 | // validate resumptionToken
|
---|
411 | token = (String)param_map.get(OAIXML.RESUMPTION_TOKEN);
|
---|
412 | logger.info("has resumptionToken" + token);
|
---|
413 | if(OAIXML.containsToken(token) == false) {
|
---|
414 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_RESUMPTION_TOKEN, ""));
|
---|
415 | }
|
---|
416 | }
|
---|
417 |
|
---|
418 | // Custom test that expects a metadataPrefix comes here at end so that the official params can
|
---|
419 | // be tested first for errors and their error responses sent off. Required for OAI validation
|
---|
420 | if (!param_map.containsKey(OAIXML.METADATA_PREFIX)) {
|
---|
421 | logger.error("contains invalid params or no metadataPrefix");
|
---|
422 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
423 | }
|
---|
424 |
|
---|
425 | //Now that we got a prefix, check and see if it's supported by this repository
|
---|
426 | String prefix_value = (String)param_map.get(OAIXML.METADATA_PREFIX);
|
---|
427 | if (containsMetadataPrefix(prefix_value) == false) {
|
---|
428 | logger.error("requested prefix is not found in OAIConfig.xml");
|
---|
429 | return getMessage(OAIXML.createErrorElement(OAIXML.CANNOT_DISSEMINATE_FORMAT, ""));
|
---|
430 | }
|
---|
431 |
|
---|
432 | //Now that all validation has been done, I hope, we can send request to the message router
|
---|
433 | Element result = null;
|
---|
434 | String verb = req.getAttribute(OAIXML.TO);
|
---|
435 | NodeList param_list = req.getElementsByTagName(OAIXML.PARAM);
|
---|
436 | ArrayList retain_param_list = new ArrayList();
|
---|
437 | for (int j=0; j<param_list.getLength(); j++) {
|
---|
438 | Element e = OAIXML.duplicateElement(msg.getOwnerDocument(), (Element)param_list.item(j), true);
|
---|
439 | retain_param_list.add(e);
|
---|
440 | }
|
---|
441 |
|
---|
442 | //re-organize the request element
|
---|
443 | // reset the 'to' attribute
|
---|
444 | if (request_set == false) {
|
---|
445 | logger.info("requesting identifiers of all collections");
|
---|
446 | for(int i=0; i<oai_coll_size; i++) {
|
---|
447 | if(req == null) {
|
---|
448 | req = msg.getOwnerDocument().createElement(GSXML.REQUEST_ELEM);
|
---|
449 | msg.appendChild(req);
|
---|
450 | for (int j=0; j<retain_param_list.size(); j++) {
|
---|
451 | req.appendChild((Element)retain_param_list.get(j));
|
---|
452 | }
|
---|
453 | }
|
---|
454 | String full_name = ((Element)oai_coll.item(i)).getAttribute(OAIXML.NAME);
|
---|
455 | coll_name = full_name.substring(full_name.indexOf(":") + 1);
|
---|
456 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
457 | Node n = mr.process(msg);
|
---|
458 | Element e = converter.nodeToElement(n);
|
---|
459 | result = collectAll(result, e, verb, OAIXML.HEADER);
|
---|
460 |
|
---|
461 | //clear the content of the old request element
|
---|
462 | msg.removeChild(req);
|
---|
463 | req = null;
|
---|
464 | }
|
---|
465 | } else {
|
---|
466 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
467 | Node result_node = mr.process(msg);
|
---|
468 | result = converter.nodeToElement(result_node);
|
---|
469 | }
|
---|
470 |
|
---|
471 | if (result == null) {
|
---|
472 | logger.info("message router returns null");
|
---|
473 | return getMessage(OAIXML.createErrorElement("Internal service returns null", ""));
|
---|
474 | }
|
---|
475 | Element res = (Element)GSXML.getChildByTagName(result, OAIXML.RESPONSE);
|
---|
476 | if(res == null) {
|
---|
477 | logger.info("response element in xml_result is null");
|
---|
478 | return getMessage(OAIXML.createErrorElement("Internal service returns null", ""));
|
---|
479 | }
|
---|
480 | NodeList header_list = res.getElementsByTagName(OAIXML.HEADER);
|
---|
481 | int num_headers = header_list.getLength();
|
---|
482 | if(num_headers == 0) {
|
---|
483 | logger.info("message router returns 0 headers.");
|
---|
484 | return getMessage(OAIXML.createErrorElement(OAIXML.NO_RECORDS_MATCH, ""));
|
---|
485 | }
|
---|
486 |
|
---|
487 | //The request coming in does not contain a token, but we have to check the resume_after value and see if we need to issue a resumption token and
|
---|
488 | // save the token as well.
|
---|
489 | if (token.equals("") == true) {
|
---|
490 | if(resume_after < 0 || num_headers <= resume_after) {
|
---|
491 | //send the whole list of records
|
---|
492 | return result;
|
---|
493 | }
|
---|
494 |
|
---|
495 | //append required number of records (may be a complete or incomplete list)
|
---|
496 | getRecords(list_identifiers, header_list, 0, resume_after);
|
---|
497 | //An incomplete list is sent; append a resumptionToken element
|
---|
498 | Element token_elem = createResumptionTokenElement(num_headers, 0, resume_after, true);
|
---|
499 | //store this token
|
---|
500 | OAIXML.addToken(token_elem);
|
---|
501 |
|
---|
502 | list_identifiers.appendChild(token_elem);
|
---|
503 | return getMessage(list_identifiers);
|
---|
504 | }
|
---|
505 |
|
---|
506 | if (token.equals("") == false) {
|
---|
507 | //get an appropriate number of records (partial list) according to the token
|
---|
508 | //take out the cursor value, which is the size of previously sent list
|
---|
509 | int index = token.indexOf(":");
|
---|
510 | int cursor = Integer.parseInt(token.substring(index + 1));
|
---|
511 | Element token_elem = null;
|
---|
512 |
|
---|
513 | // are we sending the final part of a complete list?
|
---|
514 | if(cursor + resume_after >= num_headers) {
|
---|
515 | //Yes, we are.
|
---|
516 | //append required records to list_records (list is complete)
|
---|
517 | getRecords(list_identifiers, header_list, cursor, num_headers);
|
---|
518 | //An incomplete list is sent; append a resumptionToken element
|
---|
519 | token_elem = createResumptionTokenElement(num_headers, cursor, -1, false);
|
---|
520 | list_identifiers.appendChild(token_elem);
|
---|
521 | } else {
|
---|
522 | //No, we are not.
|
---|
523 | //append required records to list_records (list is incomplete)
|
---|
524 | getRecords(list_identifiers, header_list, cursor, cursor + resume_after);
|
---|
525 | token_elem = createResumptionTokenElement(num_headers, cursor, cursor + resume_after, true);
|
---|
526 | //store this token
|
---|
527 | OAIXML.addToken(token_elem);
|
---|
528 | list_identifiers.appendChild(token_elem);
|
---|
529 | }
|
---|
530 |
|
---|
531 | return getMessage(list_identifiers);
|
---|
532 | }//end of if(!token.equals(""))
|
---|
533 |
|
---|
534 | return result;
|
---|
535 | }
|
---|
536 | private Element doListRecords(Element msg){
|
---|
537 | logger.info("");
|
---|
538 | // option: from, until, set, metadataPrefix, and resumptionToken
|
---|
539 | // exceptions: badArgument, badResumptionToken, cannotDisseminateFormat, noRecordMatch, and noSetHierarchy
|
---|
540 | HashSet valid_strs = new HashSet();
|
---|
541 | valid_strs.add(OAIXML.FROM);
|
---|
542 | valid_strs.add(OAIXML.UNTIL);
|
---|
543 | valid_strs.add(OAIXML.SET);
|
---|
544 | valid_strs.add(OAIXML.METADATA_PREFIX);
|
---|
545 | valid_strs.add(OAIXML.RESUMPTION_TOKEN);
|
---|
546 |
|
---|
547 | Element list_records = OAIXML.createElement(OAIXML.LIST_RECORDS);
|
---|
548 | Element req = (Element)GSXML.getChildByTagName(msg, GSXML.REQUEST_ELEM);
|
---|
549 | if (req == null) { logger.error("req is null"); return null; }
|
---|
550 | NodeList params = GSXML.getChildrenByTagName(req, OAIXML.PARAM);
|
---|
551 |
|
---|
552 | String coll_name = "";
|
---|
553 | String token = "";
|
---|
554 |
|
---|
555 | if(params.getLength() == 0) {
|
---|
556 | logger.error("must at least have the metadataPrefix parameter, can't be none");
|
---|
557 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
558 | }
|
---|
559 |
|
---|
560 | HashMap param_map = OAIXML.getParamMap(params);
|
---|
561 | if (!isValidParam(param_map, valid_strs)) {
|
---|
562 | logger.error("One of the params is invalid");
|
---|
563 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
564 | }
|
---|
565 | // param keys are valid, but if there are any date params, check they're of the right format
|
---|
566 | String from = (String)param_map.get(OAIXML.FROM);
|
---|
567 | if(from != null) {
|
---|
568 | Date from_date = OAIXML.getDate(from);
|
---|
569 | if(from_date == null) {
|
---|
570 | logger.error("invalid date: " + from);
|
---|
571 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
572 | }
|
---|
573 | }
|
---|
574 | String until = (String)param_map.get(OAIXML.UNTIL);
|
---|
575 | Date until_date = null;
|
---|
576 | if(until != null) {
|
---|
577 | until_date = OAIXML.getDate(until);
|
---|
578 | if(until_date == null) {
|
---|
579 | logger.error("invalid date: " + until);
|
---|
580 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
581 | }
|
---|
582 | }
|
---|
583 | if(from != null && until != null) { // check they are of the same date-time format (granularity)
|
---|
584 | if(from.length() != until.length()) {
|
---|
585 | logger.error("The request has different granularities (date-time formats) for the From and Until date parameters.");
|
---|
586 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
587 | }
|
---|
588 | }
|
---|
589 |
|
---|
590 | //ask the message router for a list of oai collections
|
---|
591 | NodeList oai_coll = getOAICollectionList();
|
---|
592 | int oai_coll_size = oai_coll.getLength();
|
---|
593 | if (oai_coll_size == 0) {
|
---|
594 | logger.info("returned oai collection list is empty");
|
---|
595 | return getMessage(OAIXML.createErrorElement(OAIXML.NO_RECORDS_MATCH, ""));
|
---|
596 | }
|
---|
597 |
|
---|
598 | //Now we check if the optional argument 'set' has been specified in the params; if so,
|
---|
599 | //whether the specified setSpec is supported by this repository
|
---|
600 | boolean request_set = param_map.containsKey(OAIXML.SET);
|
---|
601 | if(request_set == true) {
|
---|
602 | boolean set_supported = false;
|
---|
603 | String set_spec_str = (String)param_map.get(OAIXML.SET);
|
---|
604 | // get the collection name
|
---|
605 | //if setSpec is supported by this repository, it must be in the form: site_name:coll_name
|
---|
606 | String[] strs = splitSetSpec(set_spec_str);
|
---|
607 | // name_of_site = strs[0];
|
---|
608 | coll_name = strs[1];
|
---|
609 | //logger.info("param contains set: "+coll_name);
|
---|
610 |
|
---|
611 | for(int i=0; i<oai_coll_size; i++) {
|
---|
612 | if(set_spec_str.equals(((Element)oai_coll.item(i)).getAttribute(OAIXML.NAME))) {
|
---|
613 | set_supported = true;
|
---|
614 | }
|
---|
615 | }
|
---|
616 | if(set_supported == false) {
|
---|
617 | logger.error("requested set is not found in this repository");
|
---|
618 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
619 | }
|
---|
620 | }
|
---|
621 |
|
---|
622 | //Is there a resumptionToken included which is requesting an incomplete list?
|
---|
623 | if(param_map.containsKey(OAIXML.RESUMPTION_TOKEN)) {
|
---|
624 | // validate resumptionToken
|
---|
625 | //if (the token value is not found in the token xml file) {
|
---|
626 | // return getMessage(OAIXML.createErrorElement(OAIXML.BAD_RESUMPTION_TOKEN, ""));
|
---|
627 | //} else {
|
---|
628 | // use the request to get a complete list of records from the message router
|
---|
629 | // and issue the subsequent part of that complete list according to the token.
|
---|
630 | // store a new token if necessary.
|
---|
631 | //}
|
---|
632 | token = (String)param_map.get(OAIXML.RESUMPTION_TOKEN);
|
---|
633 | logger.info("has resumptionToken: " + token);
|
---|
634 | if(OAIXML.containsToken(token) == false) {
|
---|
635 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_RESUMPTION_TOKEN, ""));
|
---|
636 | }
|
---|
637 | }
|
---|
638 |
|
---|
639 | // Moved the additional custom test that mandates the metadataPrefix here, since official
|
---|
640 | // errors should be caught first, so that their error responses can be sent off first
|
---|
641 | // such that GS2's oaiserver will validate properly.
|
---|
642 | if (!param_map.containsKey(OAIXML.METADATA_PREFIX)) {
|
---|
643 | if(!token.equals("")) { // resumptiontoken
|
---|
644 | int lastIndex = token.lastIndexOf(":");
|
---|
645 | if(lastIndex != token.indexOf(":")) { // if a meta_prefix is suffixed to the usual token,
|
---|
646 | // put that in the map and remove it from the end of the stored token
|
---|
647 | String meta_prefix = token.substring(lastIndex+1);
|
---|
648 | param_map.put(OAIXML.METADATA_PREFIX, meta_prefix);
|
---|
649 | token = token.substring(0, lastIndex);
|
---|
650 | param_map.put(OAIXML.RESUMPTION_TOKEN, token);
|
---|
651 |
|
---|
652 | // Add to request <param name="metadataPrefix" value="oai_dc"/>
|
---|
653 | // need to add metaprefix as param to request, else a request
|
---|
654 | // for subsequent records when working with resumption tokens will fail
|
---|
655 | Element paramEl = req.getOwnerDocument().createElement(OAIXML.PARAM);
|
---|
656 | paramEl.setAttribute(OAIXML.NAME, OAIXML.METADATA_PREFIX);
|
---|
657 | paramEl.setAttribute(OAIXML.VALUE, meta_prefix);
|
---|
658 | req.appendChild(paramEl);
|
---|
659 | }
|
---|
660 | } else { // no metadata_prefix
|
---|
661 |
|
---|
662 | // it must have a metadataPrefix
|
---|
663 | /** Here I disagree with the OAI specification: even if a resumptionToken is
|
---|
664 | * included in the request, the metadataPrefix is a must argument. Otherwise
|
---|
665 | * how would we know what metadataPrefix the harvester requested in his last request?
|
---|
666 | */
|
---|
667 | logger.error("no metadataPrefix");
|
---|
668 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
669 | }
|
---|
670 | }
|
---|
671 |
|
---|
672 | //Now that we got a prefix, check and see if it's supported by this repository
|
---|
673 | String prefix_value = (String)param_map.get(OAIXML.METADATA_PREFIX);
|
---|
674 | if (containsMetadataPrefix(prefix_value) == false) {
|
---|
675 | logger.error("requested prefix is not found in OAIConfig.xml");
|
---|
676 | return getMessage(OAIXML.createErrorElement(OAIXML.CANNOT_DISSEMINATE_FORMAT, ""));
|
---|
677 | }
|
---|
678 |
|
---|
679 |
|
---|
680 | //Now that all validation has been done, I hope, we can send request to the message router
|
---|
681 | Element result = null;
|
---|
682 | String verb = req.getAttribute(OAIXML.TO);
|
---|
683 | NodeList param_list = req.getElementsByTagName(OAIXML.PARAM);
|
---|
684 | ArrayList retain_param_list = new ArrayList();
|
---|
685 | for (int j=0; j<param_list.getLength(); j++) {
|
---|
686 | Element e = OAIXML.duplicateElement(msg.getOwnerDocument(), (Element)param_list.item(j), true);
|
---|
687 | retain_param_list.add(e);
|
---|
688 | }
|
---|
689 |
|
---|
690 | //re-organize the request element
|
---|
691 | // reset the 'to' attribute
|
---|
692 | if (request_set == false) {
|
---|
693 | //coll_name could be "", which means it's requesting all records of all collections
|
---|
694 | //we send a request to each collection asking for its records
|
---|
695 | for(int i=0; i<oai_coll_size; i++) {
|
---|
696 | if(req == null) {
|
---|
697 | req = msg.getOwnerDocument().createElement(GSXML.REQUEST_ELEM);
|
---|
698 | msg.appendChild(req);
|
---|
699 | for (int j=0; j<retain_param_list.size(); j++) {
|
---|
700 | req.appendChild((Element)retain_param_list.get(j));
|
---|
701 | }
|
---|
702 | }
|
---|
703 | String full_name = ((Element)oai_coll.item(i)).getAttribute(OAIXML.NAME);
|
---|
704 | coll_name = full_name.substring(full_name.indexOf(":") + 1);
|
---|
705 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
706 | //logger.info(GSXML.xmlNodeToString(req));
|
---|
707 | Node n = mr.process(msg);
|
---|
708 | Element e = converter.nodeToElement(n);
|
---|
709 | result = collectAll(result, e, verb, OAIXML.RECORD);
|
---|
710 |
|
---|
711 | //clear the content of the old request element
|
---|
712 | msg.removeChild(req);
|
---|
713 | req = null;
|
---|
714 | }
|
---|
715 | } else {
|
---|
716 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
717 |
|
---|
718 | Node result_node = mr.process(msg);
|
---|
719 | result = converter.nodeToElement(result_node);
|
---|
720 | }
|
---|
721 |
|
---|
722 | if (result == null) {
|
---|
723 | logger.info("message router returns null");
|
---|
724 | return getMessage(OAIXML.createErrorElement("Internal service returns null", ""));
|
---|
725 | }
|
---|
726 | Element res = (Element)GSXML.getChildByTagName(result, OAIXML.RESPONSE);
|
---|
727 | if(res == null) {
|
---|
728 | logger.info("response element in xml_result is null");
|
---|
729 | return getMessage(OAIXML.createErrorElement("Internal service returns null", ""));
|
---|
730 | }
|
---|
731 | NodeList record_list = res.getElementsByTagName(OAIXML.RECORD);
|
---|
732 | int num_records = record_list.getLength();
|
---|
733 | if(num_records == 0) {
|
---|
734 | logger.info("message router returns 0 records.");
|
---|
735 | return getMessage(OAIXML.createErrorElement(OAIXML.NO_RECORDS_MATCH, ""));
|
---|
736 | }
|
---|
737 |
|
---|
738 | //The request coming in does not contain a token, but we have to check the resume_after value and see if we need to issue a resumption token and
|
---|
739 | // save the token as well.
|
---|
740 | if (token.equals("") == true) {
|
---|
741 | if(resume_after < 0 || num_records <= resume_after) {
|
---|
742 | //send the whole list of records
|
---|
743 | return result;
|
---|
744 | }
|
---|
745 |
|
---|
746 | //append required number of records (may be a complete or incomplete list)
|
---|
747 | getRecords(list_records, record_list, 0, resume_after);
|
---|
748 | //An incomplete list is sent; append a resumptionToken element
|
---|
749 | Element token_elem = createResumptionTokenElement(num_records, 0, resume_after, true, (String)param_map.get(OAIXML.METADATA_PREFIX));
|
---|
750 | //store this token
|
---|
751 | OAIXML.addToken(token_elem);
|
---|
752 |
|
---|
753 | list_records.appendChild(token_elem);
|
---|
754 | return getMessage(list_records);
|
---|
755 | }
|
---|
756 |
|
---|
757 | if (token.equals("") == false) {
|
---|
758 | //get an appropriate number of records (partial list) according to the token
|
---|
759 | //take out the cursor value, which is the size of previously sent list
|
---|
760 | int index = token.indexOf(":");
|
---|
761 | int cursor = Integer.parseInt(token.substring(index + 1));
|
---|
762 | Element token_elem = null;
|
---|
763 |
|
---|
764 | // are we sending the final part of a complete list?
|
---|
765 | if(cursor + resume_after >= num_records) {
|
---|
766 | //Yes, we are.
|
---|
767 | //append required records to list_records (list is complete)
|
---|
768 | getRecords(list_records, record_list, cursor, num_records);
|
---|
769 | //An incomplete list is sent; append a resumptionToken element
|
---|
770 | token_elem = createResumptionTokenElement(num_records, cursor, -1, false, (String)param_map.get(OAIXML.METADATA_PREFIX));
|
---|
771 | list_records.appendChild(token_elem);
|
---|
772 |
|
---|
773 | } else {
|
---|
774 | //No, we are not.
|
---|
775 | //append required records to list_records (list is incomplete)
|
---|
776 | getRecords(list_records, record_list, cursor, cursor + resume_after);
|
---|
777 | token_elem = createResumptionTokenElement(num_records, cursor, cursor + resume_after, true, (String)param_map.get(OAIXML.METADATA_PREFIX));
|
---|
778 | //store this token
|
---|
779 | OAIXML.addToken(token_elem);
|
---|
780 | list_records.appendChild(token_elem);
|
---|
781 | }
|
---|
782 |
|
---|
783 | return getMessage(list_records);
|
---|
784 | }//end of if(!token.equals(""))
|
---|
785 |
|
---|
786 | return result;//a backup return
|
---|
787 | }
|
---|
788 | // method exclusively used by doListRecords/doListIdentifiers
|
---|
789 | private void getRecords(Element verb_elem, NodeList list, int start_point, int end_point) {
|
---|
790 | for (int i=start_point; i<end_point; i++) {
|
---|
791 | verb_elem.appendChild(verb_elem.getOwnerDocument().importNode(list.item(i), true));
|
---|
792 | }
|
---|
793 | }
|
---|
794 | private Element collectAll(Element result, Element msg, String verb, String elem_name) {
|
---|
795 | if(result == null) {
|
---|
796 | //in the first round, result is null
|
---|
797 | return msg;
|
---|
798 | }
|
---|
799 | Element res_in_result = (Element)GSXML.getChildByTagName(result, OAIXML.RESPONSE);
|
---|
800 | if(res_in_result == null) { // return the results of all other collections accumulated so far
|
---|
801 | return msg;
|
---|
802 | }
|
---|
803 | Element verb_elem = (Element)GSXML.getChildByTagName(res_in_result, verb);
|
---|
804 | if(msg == null) {
|
---|
805 | return result;
|
---|
806 | }
|
---|
807 |
|
---|
808 | //e.g., get all <record> elements from the returned message. There may be none of
|
---|
809 | //such element, for example, the collection service returned an error message
|
---|
810 | NodeList elem_list = msg.getElementsByTagName(elem_name);
|
---|
811 |
|
---|
812 | for (int i=0; i<elem_list.getLength(); i++) {
|
---|
813 | verb_elem.appendChild(res_in_result.getOwnerDocument().importNode(elem_list.item(i), true));
|
---|
814 | }
|
---|
815 | return result;
|
---|
816 | }
|
---|
817 | /** there are three possible exception conditions: bad argument, idDoesNotExist, and noMetadataFormats.
|
---|
818 | * The first one is handled here, and the last two are processed by OAIPMH.
|
---|
819 | */
|
---|
820 | private Element doListMetadataFormats(Element msg) {
|
---|
821 | //if the verb is ListMetadataFormats, there could be only one parameter: identifier
|
---|
822 | //, or there is no parameter; otherwise it is an error
|
---|
823 | //logger.info("" + this.converter.getString(msg));
|
---|
824 |
|
---|
825 | Element list_metadata_formats = OAIXML.createElement(OAIXML.LIST_METADATA_FORMATS);
|
---|
826 |
|
---|
827 | Element req = (Element)GSXML.getChildByTagName(msg, GSXML.REQUEST_ELEM);
|
---|
828 | if (req == null) { logger.error(""); return null; }
|
---|
829 | NodeList params = GSXML.getChildrenByTagName(req, OAIXML.PARAM);
|
---|
830 | Element param = null;
|
---|
831 | if(params.getLength() == 0) {
|
---|
832 | //this is requesting metadata formats for the whole repository
|
---|
833 | //read the oaiConfig.xml file, return the metadata formats specified there.
|
---|
834 | Element oai_config = OAIXML.getOAIConfigXML();
|
---|
835 | if (oai_config == null) {
|
---|
836 | return getMessage(OAIXML.createErrorElement(OAIXML.ERROR, OAIXML.SERVICE_UNAVAILABLE));
|
---|
837 | } else {
|
---|
838 | Element format_list = (Element)GSXML.getChildByTagName(oai_config, OAIXML.LIST_METADATA_FORMATS);
|
---|
839 | if(format_list == null) {
|
---|
840 | logger.error("OAIConfig.xml must contain the supported metadata formats");
|
---|
841 | return getMessage(list_metadata_formats);
|
---|
842 | }
|
---|
843 | NodeList formats = format_list.getElementsByTagName(OAIXML.METADATA_FORMAT);
|
---|
844 | for(int i=0; i<formats.getLength(); i++) {
|
---|
845 | Element meta_fmt = OAIXML.createElement(OAIXML.METADATA_FORMAT);
|
---|
846 | Element first_meta_format = (Element)formats.item(i);
|
---|
847 | //the element also contains mappings, but we don't want them
|
---|
848 | meta_fmt.appendChild(meta_fmt.getOwnerDocument().importNode(GSXML.getChildByTagName(first_meta_format, OAIXML.METADATA_PREFIX), true));
|
---|
849 | meta_fmt.appendChild(meta_fmt.getOwnerDocument().importNode(GSXML.getChildByTagName(first_meta_format, OAIXML.SCHEMA), true));
|
---|
850 | meta_fmt.appendChild(meta_fmt.getOwnerDocument().importNode(GSXML.getChildByTagName(first_meta_format, OAIXML.METADATA_NAMESPACE), true));
|
---|
851 | list_metadata_formats.appendChild(meta_fmt);
|
---|
852 | }
|
---|
853 | return getMessage(list_metadata_formats);
|
---|
854 | }
|
---|
855 |
|
---|
856 | } else if (params.getLength() > 1) {
|
---|
857 | //Bad argument. Can't be more than one parameters for ListMetadataFormats verb
|
---|
858 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
859 | } else {
|
---|
860 | // This is a request for the metadata of a particular item with an identifier
|
---|
861 | /**the request xml is in the form: <request>
|
---|
862 | * <param name=.../>
|
---|
863 | * </request>
|
---|
864 | *And there is a param element and one element only. (No paramList element in between).
|
---|
865 | */
|
---|
866 | param = (Element)params.item(0);
|
---|
867 | String param_name = param.getAttribute(OAIXML.NAME);
|
---|
868 | String identifier = "";
|
---|
869 | if (!param_name.equals(OAIXML.IDENTIFIER)) {
|
---|
870 | //Bad argument
|
---|
871 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
872 | } else {
|
---|
873 | identifier = param.getAttribute(OAIXML.VALUE);
|
---|
874 | // the identifier is in the form: <site_name>:<coll_name>:<OID>
|
---|
875 | // so it must contain at least two ':' characters
|
---|
876 | String[] strs = identifier.split(":");
|
---|
877 | if(strs == null || strs.length < 3) {
|
---|
878 | // the OID may also contain ':'
|
---|
879 | logger.error("identifier is not in the form site:coll:id" + identifier);
|
---|
880 | return getMessage(OAIXML.createErrorElement(OAIXML.ID_DOES_NOT_EXIST, ""));
|
---|
881 | }
|
---|
882 |
|
---|
883 | // send request to message router
|
---|
884 | // get the names
|
---|
885 | strs = splitNames(identifier);
|
---|
886 | if(strs == null || strs.length < 3) {
|
---|
887 | logger.error("identifier is not in the form site:coll:id" + identifier);
|
---|
888 | return getMessage(OAIXML.createErrorElement(OAIXML.ID_DOES_NOT_EXIST, ""));
|
---|
889 | }
|
---|
890 | String name_of_site = strs[0];
|
---|
891 | String coll_name = strs[1];
|
---|
892 | String oid = strs[2];
|
---|
893 |
|
---|
894 | //re-organize the request element
|
---|
895 | // reset the 'to' attribute
|
---|
896 | String verb = req.getAttribute(OAIXML.TO);
|
---|
897 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
898 | // reset the identifier element
|
---|
899 | param.setAttribute(OAIXML.NAME, OAIXML.OID);
|
---|
900 | param.setAttribute(OAIXML.VALUE, oid);
|
---|
901 |
|
---|
902 | //Now send the request to the message router to process
|
---|
903 | Node result_node = mr.process(msg);
|
---|
904 | return converter.nodeToElement(result_node);
|
---|
905 | }
|
---|
906 | }
|
---|
907 |
|
---|
908 | }
|
---|
909 | private void appendParam(Element req, String name, String value) {
|
---|
910 | Element param = req.getOwnerDocument().createElement(OAIXML.PARAM);
|
---|
911 | param.setAttribute(OAIXML.NAME, name);
|
---|
912 | param.setAttribute(OAIXML.VALUE, value);
|
---|
913 | req.appendChild(param);
|
---|
914 | }
|
---|
915 | private void copyElement(Element identify, String tag_name) {
|
---|
916 | Element from_repository_name = (Element)GSXML.getChildByTagName(oai_config, tag_name);
|
---|
917 | if(from_repository_name != null) {
|
---|
918 | Element this_repository_name = OAIXML.createElement(tag_name);
|
---|
919 | GSXML.setNodeText(this_repository_name, GSXML.getNodeText(from_repository_name));
|
---|
920 | identify.appendChild(this_repository_name);
|
---|
921 | }
|
---|
922 | }
|
---|
923 | private Element doIdentify() {
|
---|
924 | //The validation for this verb has been done in OAIServer.validate(). So no bother here.
|
---|
925 | logger.info("");
|
---|
926 |
|
---|
927 | Element identify = OAIXML.createElement(OAIXML.IDENTIFY);
|
---|
928 | //do the repository name
|
---|
929 | copyElement(identify, OAIXML.REPOSITORY_NAME);
|
---|
930 | //do the baseurl
|
---|
931 | copyElement(identify, OAIXML.BASE_URL);
|
---|
932 | //do the protocol version
|
---|
933 | copyElement(identify, OAIXML.PROTOCOL_VERSION);
|
---|
934 |
|
---|
935 | //There can be more than one admin email according to the OAI specification
|
---|
936 | NodeList admin_emails = GSXML.getChildrenByTagName(oai_config, OAIXML.ADMIN_EMAIL);
|
---|
937 | int num_admin = 0;
|
---|
938 | Element from_admin_email = null;
|
---|
939 | if (admin_emails != null) {
|
---|
940 | num_admin = admin_emails.getLength();
|
---|
941 | }
|
---|
942 | for (int i=0; i<num_admin; i++) {
|
---|
943 | copyElement(identify, OAIXML.ADMIN_EMAIL);
|
---|
944 | }
|
---|
945 |
|
---|
946 | //do the earliestDatestamp
|
---|
947 | //send request to mr to search through the earliest datestamp amongst all oai collections in the repository.
|
---|
948 | //ask the message router for a list of oai collections
|
---|
949 | NodeList oai_coll = getOAICollectionList();
|
---|
950 | long earliestDatestamp = getEarliestDateStamp(oai_coll);
|
---|
951 | String earliestDatestamp_str = OAIXML.getTime(earliestDatestamp);
|
---|
952 | Element earliestDatestamp_elem = OAIXML.createElement(OAIXML.EARLIEST_DATESTAMP);
|
---|
953 | GSXML.setNodeText(earliestDatestamp_elem, earliestDatestamp_str);
|
---|
954 | identify.appendChild(earliestDatestamp_elem);
|
---|
955 |
|
---|
956 | //do the deletedRecord
|
---|
957 | copyElement(identify, OAIXML.DELETED_RECORD);
|
---|
958 | //do the granularity
|
---|
959 | copyElement(identify, OAIXML.GRANULARITY);
|
---|
960 |
|
---|
961 | return getMessage(identify);
|
---|
962 | }
|
---|
963 | //split setSpec (site_name:coll_name) into an array of strings
|
---|
964 | //It has already been checked that the set_spec contains at least one ':'
|
---|
965 | private String[] splitSetSpec(String set_spec) {
|
---|
966 | logger.info(set_spec);
|
---|
967 | String[] strs = new String[2];
|
---|
968 | int colon_index = set_spec.indexOf(":");
|
---|
969 | strs[0] = set_spec.substring(0, colon_index);
|
---|
970 | strs[1] = set_spec.substring(colon_index + 1);
|
---|
971 | return strs;
|
---|
972 | }
|
---|
973 | /** split the identifier into <site + collection + OID> as an array
|
---|
974 | It has already been checked that the 'identifier' contains at least two ':'
|
---|
975 | */
|
---|
976 | private String[] splitNames(String identifier) {
|
---|
977 | logger.info(identifier);
|
---|
978 | String [] strs = new String[3];
|
---|
979 | int first_colon = identifier.indexOf(":");
|
---|
980 | if(first_colon == -1) {
|
---|
981 | return null;
|
---|
982 | }
|
---|
983 | strs[0] = identifier.substring(0, first_colon);
|
---|
984 |
|
---|
985 | String sr = identifier.substring(first_colon + 1);
|
---|
986 | int second_colon = sr.indexOf(":");
|
---|
987 | //logger.error(first_colon + " " + second_colon);
|
---|
988 | strs[1] = sr.substring(0, second_colon);
|
---|
989 |
|
---|
990 | strs[2] = sr.substring(second_colon + 1);
|
---|
991 | return strs;
|
---|
992 | }
|
---|
993 | /** validate if the specified metadata prefix value is supported by the repository
|
---|
994 | * by checking it in the OAIConfig.xml
|
---|
995 | */
|
---|
996 | private boolean containsMetadataPrefix(String prefix_value) {
|
---|
997 | NodeList prefix_list = oai_config.getElementsByTagName(OAIXML.METADATA_PREFIX);
|
---|
998 |
|
---|
999 | for(int i=0; i<prefix_list.getLength(); i++) {
|
---|
1000 | if(prefix_value.equals(GSXML.getNodeText((Element)prefix_list.item(i)).trim() )) {
|
---|
1001 | return true;
|
---|
1002 | }
|
---|
1003 | }
|
---|
1004 | return false;
|
---|
1005 | }
|
---|
1006 | private Element doGetRecord(Element msg){
|
---|
1007 | logger.info("");
|
---|
1008 | /** arguments:
|
---|
1009 | identifier: required
|
---|
1010 | metadataPrefix: required
|
---|
1011 | * Exceptions: badArgument; cannotDisseminateFormat; idDoesNotExist
|
---|
1012 | */
|
---|
1013 | Element get_record = OAIXML.createElement(OAIXML.GET_RECORD);
|
---|
1014 |
|
---|
1015 | HashSet valid_strs = new HashSet();
|
---|
1016 | valid_strs.add(OAIXML.IDENTIFIER);
|
---|
1017 | valid_strs.add(OAIXML.METADATA_PREFIX);
|
---|
1018 |
|
---|
1019 | Element req = (Element)GSXML.getChildByTagName(msg, GSXML.REQUEST_ELEM);
|
---|
1020 | NodeList params = GSXML.getChildrenByTagName(req, OAIXML.PARAM);
|
---|
1021 | HashMap param_map = OAIXML.getParamMap(params);
|
---|
1022 |
|
---|
1023 | if(!isValidParam(param_map, valid_strs) ||
|
---|
1024 | params.getLength() == 0 ||
|
---|
1025 | param_map.containsKey(OAIXML.IDENTIFIER) == false ||
|
---|
1026 | param_map.containsKey(OAIXML.METADATA_PREFIX) == false ) {
|
---|
1027 | logger.error("must have the metadataPrefix/identifier parameter.");
|
---|
1028 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
1029 | }
|
---|
1030 |
|
---|
1031 | String prefix = (String)param_map.get(OAIXML.METADATA_PREFIX);
|
---|
1032 | String identifier = (String)param_map.get(OAIXML.IDENTIFIER);
|
---|
1033 |
|
---|
1034 | // verify the metadata prefix
|
---|
1035 | if (containsMetadataPrefix(prefix) == false) {
|
---|
1036 | logger.error("requested prefix is not found in OAIConfig.xml");
|
---|
1037 | return getMessage(OAIXML.createErrorElement(OAIXML.CANNOT_DISSEMINATE_FORMAT, ""));
|
---|
1038 | }
|
---|
1039 |
|
---|
1040 | // get the names
|
---|
1041 | String[] strs = splitNames(identifier);
|
---|
1042 | if(strs == null || strs.length < 3) {
|
---|
1043 | logger.error("identifier is not in the form site:coll:id" + identifier);
|
---|
1044 | return getMessage(OAIXML.createErrorElement(OAIXML.ID_DOES_NOT_EXIST, ""));
|
---|
1045 | }
|
---|
1046 | String name_of_site = strs[0];
|
---|
1047 | String coll_name = strs[1];
|
---|
1048 | String oid = strs[2];
|
---|
1049 |
|
---|
1050 | //re-organize the request element
|
---|
1051 | // reset the 'to' attribute
|
---|
1052 | String verb = req.getAttribute(OAIXML.TO);
|
---|
1053 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
1054 | // reset the identifier element
|
---|
1055 | Element param = GSXML.getNamedElement(req, OAIXML.PARAM, OAIXML.NAME, OAIXML.IDENTIFIER);
|
---|
1056 | if (param != null) {
|
---|
1057 | param.setAttribute(OAIXML.NAME, OAIXML.OID);
|
---|
1058 | param.setAttribute(OAIXML.VALUE, oid);
|
---|
1059 | }
|
---|
1060 |
|
---|
1061 | //Now send the request to the message router to process
|
---|
1062 | Node result_node = mr.process(msg);
|
---|
1063 | return converter.nodeToElement(result_node);
|
---|
1064 | }
|
---|
1065 |
|
---|
1066 | // See OAIConfig.xml
|
---|
1067 | // dynamically works out what the earliestDateStamp is, since it varies by collection
|
---|
1068 | // returns this time in *milliseconds*.
|
---|
1069 | protected long getEarliestDateStamp(NodeList oai_coll) {
|
---|
1070 | //do the earliestDatestamp
|
---|
1071 | long earliestDatestamp = System.currentTimeMillis();
|
---|
1072 | int oai_coll_size = oai_coll.getLength();
|
---|
1073 | if (oai_coll_size == 0) {
|
---|
1074 | logger.info("returned oai collection list is empty. Setting repository earliestDatestamp to be 1970-01-01.");
|
---|
1075 | earliestDatestamp = 0;
|
---|
1076 | }
|
---|
1077 | // the earliestDatestamp is now stored as a metadata element in the collection's buildConfig.xml file
|
---|
1078 | // we get the earliestDatestamp among the collections
|
---|
1079 | for(int i=0; i<oai_coll_size; i++) {
|
---|
1080 | long coll_earliestDatestamp = Long.parseLong(((Element)oai_coll.item(i)).getAttribute(OAIXML.EARLIEST_DATESTAMP));
|
---|
1081 | earliestDatestamp = (earliestDatestamp > coll_earliestDatestamp)? coll_earliestDatestamp : earliestDatestamp;
|
---|
1082 | }
|
---|
1083 |
|
---|
1084 | return earliestDatestamp*1000; // converting from seconds to milliseconds
|
---|
1085 | }
|
---|
1086 | }
|
---|