1 | package eu.clarin.sru.server.fcs.utils; |
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2 | |
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3 | import java.io.IOException; |
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4 | import java.net.URI; |
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5 | import java.net.URISyntaxException; |
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6 | import java.net.URL; |
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7 | import java.util.ArrayList; |
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8 | import java.util.HashMap; |
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9 | import java.util.HashSet; |
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10 | import java.util.Iterator; |
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11 | import java.util.List; |
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12 | import java.util.Map; |
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13 | import java.util.Set; |
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14 | |
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15 | import javax.xml.XMLConstants; |
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16 | import javax.xml.namespace.NamespaceContext; |
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17 | import javax.xml.parsers.DocumentBuilder; |
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18 | import javax.xml.parsers.DocumentBuilderFactory; |
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19 | import javax.xml.parsers.ParserConfigurationException; |
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20 | import javax.xml.xpath.XPath; |
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21 | import javax.xml.xpath.XPathConstants; |
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22 | import javax.xml.xpath.XPathExpression; |
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23 | import javax.xml.xpath.XPathExpressionException; |
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24 | import javax.xml.xpath.XPathFactory; |
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25 | |
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26 | import org.slf4j.Logger; |
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27 | import org.slf4j.LoggerFactory; |
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28 | import org.w3c.dom.Document; |
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29 | import org.w3c.dom.Element; |
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30 | import org.w3c.dom.Node; |
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31 | import org.w3c.dom.NodeList; |
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32 | import org.xml.sax.SAXException; |
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33 | |
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34 | import eu.clarin.sru.server.SRUConfigException; |
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35 | import eu.clarin.sru.server.fcs.DataView; |
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36 | import eu.clarin.sru.server.fcs.DataView.DeliveryPolicy; |
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37 | import eu.clarin.sru.server.fcs.EndpointDescription; |
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38 | import eu.clarin.sru.server.fcs.ResourceInfo; |
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39 | |
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40 | |
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41 | /** |
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42 | * A parser, that parses an XML file and produces a endpoint description with |
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43 | * static list of resource info records. The XML file has the same format as the |
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44 | * result format defined for endpoint description of the CLARIN-FCS |
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45 | * specification. The {@link #parse(URL)} returns a |
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46 | * {@link SimpleEndpointDescription} instance. |
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47 | * |
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48 | * @see EndpointDescription |
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49 | * @see SimpleEndpointDescription |
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50 | */ |
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51 | public class SimpleEndpointDescriptionParser { |
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52 | private static final String NS = |
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53 | "http://clarin.eu/fcs/endpoint-description"; |
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54 | private static final String NS_LEGACY = |
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55 | "http://clarin.eu/fcs/1.0/resource-info"; |
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56 | private static final String CAP_BASIC_SEARCH = |
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57 | "http://clarin.eu/fcs/capability/basic-search"; |
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58 | private static final String LANG_EN = "en"; |
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59 | private static final String POLICY_SEND_DEFAULT = "send-by-default"; |
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60 | private static final String POLICY_NEED_REQUEST = "need-to-request"; |
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61 | private static final Logger logger = |
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62 | LoggerFactory.getLogger(SimpleEndpointDescriptionParser.class); |
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63 | |
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64 | |
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65 | /** |
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66 | * Parse an XML file and return a static list of resource info records. |
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67 | * |
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68 | * @param url |
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69 | * the URI pointing to the file to be parsed |
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70 | * @return an {@link EndpointDescription} instance |
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71 | * @throws SRUConfigException |
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72 | * if an error occurred |
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73 | */ |
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74 | public static EndpointDescription parse(URL url) throws SRUConfigException { |
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75 | if (url == null) { |
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76 | throw new NullPointerException("url == null"); |
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77 | } |
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78 | |
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79 | logger.debug("parsing endpoint description from: {}", url); |
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80 | |
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81 | try { |
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82 | DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
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83 | dbf.setNamespaceAware(true); |
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84 | dbf.setCoalescing(true); |
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85 | DocumentBuilder db = dbf.newDocumentBuilder(); |
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86 | Document doc = db.parse(url.openStream()); |
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87 | |
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88 | /* |
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89 | * Detect for deprecated resource-info catalog files and bail, if necessary |
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90 | */ |
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91 | checkLegacyMode(doc, url); |
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92 | |
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93 | /* |
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94 | * Parse on and create endpoint description ... |
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95 | */ |
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96 | return parseEndpointDescription(doc); |
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97 | } catch (ParserConfigurationException e) { |
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98 | throw new SRUConfigException("internal error", e); |
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99 | } catch (SAXException e) { |
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100 | throw new SRUConfigException("parsing error", e); |
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101 | } catch (IOException e) { |
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102 | throw new SRUConfigException("error reading file", e); |
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103 | } catch (XPathExpressionException e) { |
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104 | throw new SRUConfigException("internal error", e); |
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105 | } |
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106 | } |
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107 | |
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108 | |
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109 | private static EndpointDescription parseEndpointDescription(Document doc) |
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110 | throws SRUConfigException, XPathExpressionException { |
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111 | XPathFactory factory = XPathFactory.newInstance(); |
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112 | XPath xpath = factory.newXPath(); |
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113 | |
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114 | xpath.setNamespaceContext(new NamespaceContext() { |
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115 | @Override |
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116 | public Iterator<?> getPrefixes(String namespaceURI) { |
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117 | throw new UnsupportedOperationException(); |
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118 | } |
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119 | |
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120 | @Override |
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121 | public String getPrefix(String namespaceURI) { |
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122 | throw new UnsupportedOperationException(); |
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123 | } |
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124 | |
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125 | @Override |
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126 | public String getNamespaceURI(String prefix) { |
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127 | if (prefix == null) { |
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128 | throw new NullPointerException("prefix == null"); |
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129 | } |
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130 | if (prefix.equals("ed")) { |
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131 | return NS; |
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132 | } else if (prefix.equals(XMLConstants.XML_NS_PREFIX)) { |
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133 | return XMLConstants.XML_NS_URI; |
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134 | } else { |
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135 | return XMLConstants.NULL_NS_URI; |
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136 | } |
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137 | } |
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138 | }); |
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139 | |
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140 | // capabilities |
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141 | List<URI> capabilities = new ArrayList<URI>(); |
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142 | XPathExpression exp1 = |
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143 | xpath.compile("//ed:Capabilities/ed:Capability"); |
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144 | NodeList list1 = (NodeList) exp1.evaluate(doc, XPathConstants.NODESET); |
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145 | if ((list1 != null) && (list1.getLength() > 0)) { |
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146 | logger.debug("parsing capabilities"); |
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147 | for (int i = 0; i < list1.getLength(); i++) { |
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148 | String s = list1.item(i).getTextContent().trim(); |
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149 | try { |
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150 | URI uri = new URI(s); |
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151 | if (capabilities.contains(uri)) { |
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152 | logger.warn("ignoring duplicate capability " + |
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153 | "entry for '{}'", uri); |
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154 | } |
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155 | capabilities.add(uri); |
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156 | } catch (URISyntaxException e) { |
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157 | throw new SRUConfigException("capability is not encoded " + |
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158 | "as proper URI: " + s); |
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159 | } |
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160 | } |
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161 | } else { |
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162 | logger.warn("No capabilities where defined in " + |
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163 | "endpoint configuration"); |
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164 | } |
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165 | URI cap = URI.create(CAP_BASIC_SEARCH); |
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166 | if (!capabilities.contains(cap)) { |
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167 | logger.warn("capability '{}' was not defined in endpoint " + |
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168 | "description; added it to meet specification. Please " + |
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169 | "update your endpoint description!", CAP_BASIC_SEARCH); |
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170 | capabilities.add(cap); |
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171 | } |
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172 | logger.debug("CAPS:'{}'", capabilities); |
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173 | |
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174 | // supported data views |
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175 | List<DataView> supportedDataViews = new ArrayList<DataView>(); |
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176 | XPathExpression exp2 = |
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177 | xpath.compile("//ed:SupportedDataViews/ed:SupportedDataView"); |
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178 | NodeList list2 = (NodeList) exp2.evaluate(doc, XPathConstants.NODESET); |
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179 | if ((list2 != null) && (list2.getLength() > 0)) { |
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180 | logger.debug("parsing supported data views"); |
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181 | for (int i = 0; i < list2.getLength(); i++) { |
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182 | Element item = (Element) list2.item(i); |
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183 | String id = getAttribute(item, "id"); |
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184 | if (id == null) { |
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185 | throw new SRUConfigException("Element <SupportedDataView> " |
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186 | + "must carry a proper 'id' attribute"); |
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187 | } |
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188 | String p = getAttribute(item, "delivery-policy"); |
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189 | if (p == null) { |
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190 | throw new SRUConfigException("Element <SupportedDataView> " |
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191 | + "must carry a 'delivery-policy' attribute"); |
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192 | } |
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193 | DeliveryPolicy policy = null; |
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194 | if (POLICY_SEND_DEFAULT.equals(p)) { |
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195 | policy = DeliveryPolicy.SEND_BY_DEFAULT; |
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196 | } else if (POLICY_NEED_REQUEST.equals(p)) { |
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197 | policy = DeliveryPolicy.NEED_TO_REQUEST; |
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198 | } else { |
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199 | throw new SRUConfigException("Invalid value '" + p + |
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200 | "' for attribute 'delivery-policy' on element " + |
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201 | "<SupportedDataView>"); |
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202 | } |
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203 | String mimeType = item.getTextContent(); |
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204 | if (mimeType != null) { |
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205 | mimeType = mimeType.trim(); |
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206 | if (mimeType.isEmpty()) { |
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207 | mimeType = null; |
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208 | } |
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209 | } |
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210 | if (mimeType == null) { |
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211 | throw new SRUConfigException("Element <SupportedDataView> " |
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212 | + "must contain a MIME-type as content"); |
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213 | } |
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214 | // check for duplicate entries ... |
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215 | for (DataView dataView : supportedDataViews) { |
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216 | if (id.equals(dataView.getIdentifier())) { |
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217 | throw new SRUConfigException( |
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218 | "A <SupportedDataView> with " + "the id '" + |
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219 | id + "' is already defined!"); |
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220 | } |
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221 | if (mimeType.equals(dataView.getMimeType())) { |
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222 | throw new SRUConfigException( |
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223 | "A <SupportedDataView> with " + |
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224 | "the MIME-type '" + mimeType + |
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225 | "' is already defined!"); |
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226 | } |
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227 | } |
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228 | supportedDataViews.add(new DataView(id, mimeType, policy)); |
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229 | } |
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230 | } else { |
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231 | logger.error("Endpoint configuration contains no valid " + |
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232 | "information about supported data views"); |
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233 | throw new SRUConfigException("Endpoint configuration contains " + |
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234 | "no valid information about supported data views"); |
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235 | } |
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236 | |
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237 | logger.debug("DV: {}", supportedDataViews); |
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238 | |
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239 | |
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240 | // resources |
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241 | XPathExpression x3 = |
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242 | xpath.compile("/ed:EndpointDescription/ed:Resources/ed:Resource"); |
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243 | NodeList l3 = (NodeList) x3.evaluate(doc, XPathConstants.NODESET); |
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244 | final Set<String> ids = new HashSet<String>(); |
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245 | List<ResourceInfo> resources = |
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246 | parseRessources(xpath, l3, ids, supportedDataViews); |
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247 | if ((resources == null) || resources.isEmpty()) { |
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248 | throw new SRUConfigException("No resources where " + |
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249 | "defined in endpoint description"); |
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250 | } |
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251 | |
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252 | return new SimpleEndpointDescription(capabilities, |
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253 | supportedDataViews, |
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254 | resources, |
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255 | false); |
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256 | } |
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257 | |
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258 | |
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259 | private static List<ResourceInfo> parseRessources(XPath xpath, |
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260 | NodeList nodes, Set<String> ids, List<DataView> supportedDataViews) |
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261 | throws SRUConfigException, XPathExpressionException { |
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262 | List<ResourceInfo> ris = null; |
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263 | for (int k = 0; k < nodes.getLength(); k++) { |
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264 | final Element node = (Element) nodes.item(k); |
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265 | String pid = null; |
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266 | Map<String, String> titles = null; |
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267 | Map<String, String> descrs = null; |
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268 | String link = null; |
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269 | List<String> langs = null; |
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270 | List<DataView> availableDataViews = null; |
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271 | List<ResourceInfo> sub = null; |
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272 | |
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273 | pid = getAttribute(node, "pid"); |
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274 | if (pid == null) { |
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275 | throw new SRUConfigException("Element <ResourceInfo> " + |
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276 | "must carry a proper 'pid' attribute"); |
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277 | } |
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278 | if (ids.contains(pid)) { |
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279 | throw new SRUConfigException("Another element <Resource> " + |
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280 | "with pid '" + pid + "' already exists"); |
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281 | } |
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282 | ids.add(pid); |
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283 | |
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284 | XPathExpression x1 = xpath.compile("ed:Title"); |
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285 | NodeList l1 = (NodeList) x1.evaluate(node, XPathConstants.NODESET); |
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286 | if ((l1 != null) && (l1.getLength() > 0)) { |
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287 | for (int i = 0; i < l1.getLength(); i++) { |
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288 | final Element n = (Element) l1.item(i); |
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289 | |
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290 | final String lang = getLangAttribute(n); |
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291 | if (lang == null) { |
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292 | throw new SRUConfigException("Element <Title> must " + |
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293 | "carry a proper 'xml:lang' attribute"); |
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294 | } |
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295 | |
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296 | final String title = cleanString(n.getTextContent()); |
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297 | if (title == null) { |
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298 | throw new SRUConfigException("Element <Title> must " + |
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299 | "carry a non-empty 'xml:lang' attribute"); |
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300 | } |
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301 | |
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302 | if (titles == null) { |
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303 | titles = new HashMap<String, String>(); |
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304 | } |
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305 | if (titles.containsKey(lang)) { |
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306 | logger.warn("title with language '{}' already exists", |
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307 | lang); |
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308 | } else { |
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309 | logger.debug("title: '{}' '{}'", lang, title); |
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310 | titles.put(lang, title); |
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311 | } |
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312 | } |
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313 | if ((titles != null) && !titles.containsKey(LANG_EN)) { |
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314 | throw new SRUConfigException( |
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315 | "A <Title> with language 'en' is mandatory"); |
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316 | } |
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317 | } |
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318 | |
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319 | XPathExpression x2 = xpath.compile("ed:Description"); |
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320 | NodeList l2 = (NodeList) x2.evaluate(node, XPathConstants.NODESET); |
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321 | if ((l2 != null) && (l2.getLength() > 0)) { |
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322 | for (int i = 0; i < l2.getLength(); i++) { |
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323 | Element n = (Element) l2.item(i); |
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324 | |
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325 | String lang = getLangAttribute(n); |
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326 | if (lang == null) { |
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327 | throw new SRUConfigException("Element <Description> " + |
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328 | "must carry a proper 'xml:lang' attribute"); |
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329 | |
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330 | } |
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331 | String desc = cleanString(n.getTextContent()); |
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332 | |
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333 | if (descrs == null) { |
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334 | descrs = new HashMap<String, String>(); |
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335 | } |
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336 | |
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337 | if (descrs.containsKey(lang)) { |
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338 | logger.warn("description with language '{}' " |
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339 | + "already exists", lang); |
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340 | } else { |
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341 | logger.debug("description: '{}' '{}'", lang, desc); |
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342 | descrs.put(lang, desc); |
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343 | } |
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344 | } |
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345 | if ((descrs != null) && !descrs.containsKey(LANG_EN)) { |
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346 | throw new SRUConfigException( |
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347 | "A <Description> with language 'en' is mandatory"); |
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348 | } |
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349 | } |
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350 | |
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351 | XPathExpression x3 = xpath.compile("ed:LandingPageURI"); |
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352 | NodeList l3 = (NodeList) x3.evaluate(node, XPathConstants.NODESET); |
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353 | if ((l3 != null) && (l3.getLength() > 0)) { |
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354 | for (int i = 0; i < l3.getLength(); i++) { |
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355 | Element n = (Element) l3.item(i); |
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356 | link = cleanString(n.getTextContent()); |
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357 | } |
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358 | } |
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359 | |
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360 | XPathExpression x4 = xpath.compile("ed:Languages/ed:Language"); |
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361 | NodeList l4 = (NodeList) x4.evaluate(node, XPathConstants.NODESET); |
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362 | if ((l4 != null) && (l4.getLength() > 0)) { |
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363 | for (int i = 0; i < l4.getLength(); i++) { |
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364 | Element n = (Element) l4.item(i); |
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365 | |
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366 | String s = n.getTextContent(); |
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367 | if (s != null) { |
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368 | s = s.trim(); |
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369 | if (s.isEmpty()) { |
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370 | s = null; |
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371 | } |
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372 | } |
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373 | |
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374 | /* |
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375 | * enforce three letter codes |
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376 | */ |
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377 | if ((s == null) || (s.length() != 3)) { |
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378 | throw new SRUConfigException("Element <Language> " + |
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379 | "must use ISO-632-3 three letter " + |
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380 | "language codes"); |
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381 | } |
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382 | |
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383 | if (langs == null) { |
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384 | langs = new ArrayList<String>(); |
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385 | } |
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386 | langs.add(s); |
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387 | } |
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388 | } |
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389 | |
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390 | XPathExpression x5 = xpath.compile("ed:AvailableDataViews"); |
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391 | Node n = (Node) x5.evaluate(node, XPathConstants.NODE); |
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392 | if ((n != null) && (n instanceof Element)) { |
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393 | String ref = getAttribute((Element) n, "ref"); |
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394 | if (ref == null) { |
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395 | throw new SRUConfigException("Element <AvailableDataViews> " + |
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396 | "must carry a 'ref' attribute"); |
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397 | } |
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398 | String[] refs = ref.split("\\s+"); |
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399 | if ((refs == null) || (refs.length < 1)) { |
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400 | throw new SRUConfigException("Attribute 'ref' on element " + |
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401 | "<AvailableDataViews> must contain a whitespace " + |
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402 | "seperated list of data view references"); |
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403 | } |
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404 | |
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405 | |
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406 | for (int i = 0; i < refs.length; i++) { |
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407 | DataView dataview = null; |
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408 | for (DataView dv : supportedDataViews) { |
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409 | if (refs[i].equals(dv.getIdentifier())) { |
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410 | dataview = dv; |
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411 | break; |
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412 | } |
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413 | } |
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414 | if (dataview != null) { |
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415 | if (availableDataViews == null) { |
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416 | availableDataViews = new ArrayList<DataView>(); |
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417 | } |
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418 | availableDataViews.add(dataview); |
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419 | } else { |
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420 | throw new SRUConfigException("A data view with " + |
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421 | "identifier '" + refs[i] + "' was not defined " + |
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422 | "in <SupportedDataViews>"); |
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423 | } |
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424 | } |
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425 | } else { |
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426 | throw new SRUConfigException( |
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427 | "missing element <ed:AvailableDataViews>"); |
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428 | } |
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429 | if (availableDataViews == null) { |
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430 | throw new SRUConfigException("No available data views where " + |
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431 | "defined for resource with PID '" + pid + "'"); |
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432 | } |
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433 | |
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434 | XPathExpression x6 = xpath.compile("ed:Resources/ed:Resource"); |
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435 | NodeList l6 = (NodeList) x6.evaluate(node, XPathConstants.NODESET); |
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436 | if ((l6 != null) && (l6.getLength() > 0)) { |
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437 | sub = parseRessources(xpath, l6, ids, supportedDataViews); |
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438 | } |
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439 | |
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440 | if (ris == null) { |
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441 | ris = new ArrayList<ResourceInfo>(); |
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442 | } |
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443 | ris.add(new ResourceInfo(pid, |
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444 | titles, |
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445 | descrs, |
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446 | link, |
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447 | langs, |
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448 | availableDataViews, |
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449 | sub)); |
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450 | } |
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451 | return ris; |
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452 | } |
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453 | |
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454 | |
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455 | private static String getAttribute(Element el, String localName) { |
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456 | String lang = el.getAttribute(localName); |
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457 | if (lang != null) { |
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458 | lang = lang.trim(); |
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459 | if (!lang.isEmpty()) { |
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460 | return lang; |
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461 | } |
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462 | } |
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463 | return null; |
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464 | } |
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465 | |
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466 | |
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467 | private static String getLangAttribute(Element el) { |
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468 | String lang = el.getAttributeNS(XMLConstants.XML_NS_URI, "lang"); |
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469 | if (lang != null) { |
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470 | lang = lang.trim(); |
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471 | if (!lang.isEmpty()) { |
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472 | return lang; |
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473 | } |
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474 | } |
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475 | return null; |
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476 | } |
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477 | |
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478 | |
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479 | private static String cleanString(String s) { |
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480 | if (s != null) { |
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481 | s = s.trim(); |
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482 | if (!s.isEmpty()) { |
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483 | StringBuilder sb = new StringBuilder(); |
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484 | for (String z : s.split("\\s*\\n+\\s*")) { |
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485 | z = z.trim(); |
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486 | if (!z.isEmpty()) { |
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487 | if (sb.length() > 0) { |
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488 | sb.append(' '); |
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489 | } |
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490 | sb.append(z); |
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491 | } |
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492 | } |
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493 | if (sb.length() > 0) { |
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494 | return sb.toString(); |
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495 | } |
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496 | } |
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497 | } |
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498 | return null; |
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499 | } |
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500 | |
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501 | |
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502 | private static void checkLegacyMode(Document doc, URL url) |
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503 | throws SRUConfigException { |
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504 | Element root = doc.getDocumentElement(); |
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505 | if (root != null) { |
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506 | String ns = root.getNamespaceURI(); |
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507 | if (ns != null) { |
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508 | if (ns.equals(NS_LEGACY)) { |
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509 | logger.error("Detected out-dated " + |
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510 | "resource info catalog file '" + url + |
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511 | "'. Please update to the " + |
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512 | "current version"); |
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513 | throw new SRUConfigException("unsupport file format: " + ns); |
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514 | } else if (!ns.equals(NS)) { |
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515 | logger.error("Detected unsupported resource info " + |
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516 | "catalog file '" + url + "' with namespace '" + ns + '"'); |
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517 | throw new SRUConfigException("unsupport file format: " + ns); |
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518 | } |
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519 | } else { |
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520 | throw new SRUConfigException("No namespace URI was detected " + |
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521 | "for resource info catalog file '" + url +"'!"); |
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522 | } |
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523 | } else { |
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524 | throw new SRUConfigException("Error retrieving root element"); |
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525 | } |
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526 | } |
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527 | |
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528 | |
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529 | // private static List<ResourceInfo> parseLegacy(Document doc) |
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530 | // throws SRUConfigException, XPathExpressionException { |
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531 | |
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532 | } // class SimpleResourceInfoInventoryParser |
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