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package eu.dnetlib.data.collector.plugins.schemaorg;
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import org.apache.commons.io.IOUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.json.JSONObject;
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import org.jsoup.Jsoup;
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import org.jsoup.nodes.Document;
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import org.jsoup.nodes.Element;
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import org.jsoup.select.Elements;
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import java.net.URL;
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import java.nio.charset.Charset;
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import java.util.Iterator;
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public class EndpointAccessIterator implements Iterator<JSONObject> {
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private static final Log log = LogFactory.getLog(EndpointAccessIterator.class);
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public static class Options {
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private Charset charset;
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public Options(){}
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public Options(Charset charset) {
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this.charset = charset;
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}
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public Charset getCharset() {
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return charset;
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}
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public void setCharset(Charset charset) {
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this.charset = charset;
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}
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}
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private Options options;
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private Iterator<String> repositoryIterator;
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public EndpointAccessIterator(Options options, Iterator<String> repositoryIterator) {
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this.options = options;
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this.repositoryIterator = repositoryIterator;
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}
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@Override
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public boolean hasNext() {
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return this.repositoryIterator.hasNext();
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}
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@Override
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public JSONObject next() {
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String endpoint = this.repositoryIterator.next();
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if(endpoint == null) return null;
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log.debug(String.format("processing: %s", endpoint));
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JSONObject dataset = this.extractDatasetRecord(endpoint);
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return dataset;
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}
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private JSONObject extractDatasetRecord(String endpoint) {
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JSONObject datasetDocument = null;
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try {
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URL urlEndpoint = new URL(endpoint);
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log.debug("downloading endpoint "+urlEndpoint);
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String payload = Utils.RemoteAccessWithRetry(3, 5000, urlEndpoint, this.options.getCharset());
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log.trace("downloaded payload id: "+payload);
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Document doc = Jsoup.parse(payload);
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Elements scriptTags = doc.getElementsByTag("script");
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for (Element scriptTag : scriptTags) {
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if (!scriptTag.hasAttr("type")) continue;
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String scriptType = scriptTag.attr("type");
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if (!scriptType.equalsIgnoreCase("application/ld+json")) continue;
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String data = scriptTag.data();
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JSONObject schemaItem = new JSONObject(data);
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String context = schemaItem.optString("@context");
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String type = schemaItem.optString("@type");
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if (context == null || type == null) continue;
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Boolean isSchemaOrgContext = context.toLowerCase().startsWith("http://schema.org") || context.toLowerCase().startsWith("https://schema.org");
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Boolean isDataset = type.equalsIgnoreCase("dataset");
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if (!isSchemaOrgContext || !isDataset) continue;
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log.debug(String.format("discovered dataset document: %s", schemaItem.toString()));
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datasetDocument = schemaItem;
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break;
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}
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}catch(Exception ex){
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log.error("problem extracting dataset document. returning empty", ex);
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datasetDocument = null;
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}
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if(datasetDocument == null){
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log.debug("did not find any dataset document in endpoint");
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}
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else{
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log.debug("found dataset document in endpoint :"+datasetDocument.toString());
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}
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return datasetDocument;
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}
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}
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