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54525
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panagiotis
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package eu.dnetlib.repo.manager.utils;
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49236
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panagiotis
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import org.apache.log4j.Logger;
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import org.dom4j.io.DOMWriter;
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import org.w3c.dom.Document;
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import se.kb.oai.pmh.*;
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import javax.net.ssl.*;
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import javax.xml.namespace.NamespaceContext;
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import javax.xml.xpath.XPath;
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import javax.xml.xpath.XPathExpressionException;
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import javax.xml.xpath.XPathFactory;
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import java.security.KeyManagementException;
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import java.security.NoSuchAlgorithmException;
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import java.security.cert.X509Certificate;
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57890
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ioannis.di
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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49236
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panagiotis
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public class OaiTools {
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{
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disableSslVerification();
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}
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private static Logger LOGGER = Logger.getLogger(OaiTools.class);
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public static List<String> getSetsOfRepo(String baseUrl) throws Exception {
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try {
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LOGGER.debug("Getting sets of repository " + baseUrl);
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OaiPmhServer harvester = new OaiPmhServer(baseUrl);
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SetsList setList = harvester.listSets();
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ResumptionToken token = setList.getResumptionToken();
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List<Set> sets = new ArrayList<Set>();
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sets.addAll(setList.asList());
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while (token != null) {
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setList = harvester.listSets(token);
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token = setList.getResumptionToken();
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sets.addAll(setList.asList());
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}
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List<String> ret = new ArrayList<String>();
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for (Set set : sets) {
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ret.add(set.getSpec().trim());
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}
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if (ret.size() > 0 )
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Collections.sort(ret);
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return ret;
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} catch (Exception e) {
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LOGGER.error("Error getting sets of repository " + baseUrl, e);
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return new ArrayList<String>();
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//throw e;
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}
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}
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public static boolean identifyRepository(String baseUrl) throws Exception {
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LOGGER.debug("sending identify request to repo " + baseUrl);
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OaiPmhServer harvester = new OaiPmhServer(baseUrl);
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if (baseUrl.trim().isEmpty()) {
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return false;
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}
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try {
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Identification identification = harvester.identify();
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DOMWriter d4Writer = new DOMWriter();
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Document d = d4Writer.write(identification.getResponse());
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return verifyIdentify(d);
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} catch (Exception e) {
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LOGGER.debug("Error verifying identify response", e);
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throw e;
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}
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}
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private static boolean verifyIdentify(Document doc) throws XPathExpressionException {
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NamespaceContext ctx = new NamespaceContext() {
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public String getNamespaceURI(String prefix) {
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String uri;
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if (prefix.equals("oai"))
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uri = "http://www.openarchives.org/OAI/2.0/";
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else
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uri = null;
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return uri;
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}
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// Dummy implementation - not used!
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public Iterator<String> getPrefixes(String val) {
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return null;
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}
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// Dummy implemenation - not used!
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public String getPrefix(String uri) {
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return null;
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}
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};
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// Now the XPath expression
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String xpathStr = "//oai:OAI-PMH/oai:Identify";
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XPathFactory xpathFact = XPathFactory.newInstance();
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XPath xpath = xpathFact.newXPath();
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xpath.setNamespaceContext(ctx);
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String result = xpath.evaluate(xpathStr, doc);
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return (result != null && !result.equals(""));
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}
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private static void disableSslVerification() {
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try
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{
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LOGGER.debug("disabling ssl verification");
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// Create a trust manager that does not validate certificate chains
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TrustManager[] trustAllCerts = new TrustManager[] {new X509TrustManager() {
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public X509Certificate[] getAcceptedIssuers() {
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return null;
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}
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public void checkClientTrusted(X509Certificate[] certs, String authType) {
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}
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public void checkServerTrusted(X509Certificate[] certs, String authType) {
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}
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}
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};
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// Install the all-trusting trust manager
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SSLContext sc = SSLContext.getInstance("SSL");
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sc.init(null, trustAllCerts, new java.security.SecureRandom());
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HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
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// Create all-trusting host name verifier
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HostnameVerifier allHostsValid = new HostnameVerifier() {
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public boolean verify(String hostname, SSLSession session) {
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return true;
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}
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};
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// Install the all-trusting host verifier
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HttpsURLConnection.setDefaultHostnameVerifier(allHostsValid);
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} catch (NoSuchAlgorithmException e) {
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LOGGER.error("disabling ssl verification", e);
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} catch (KeyManagementException e) {
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LOGGER.error("error while disabling ssl verification", e);
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}
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}
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}
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