163 lines
5.9 KiB
Java
163 lines
5.9 KiB
Java
package eu.dnetlib.functionality.modular.ui.oai;
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import com.google.common.base.Joiner;
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import eu.dnetlib.functionality.modular.ui.oai.objects.OaiRequest;
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import eu.dnetlib.functionality.modular.ui.oai.objects.ResponseDetails;
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import eu.dnetlib.miscutils.datetime.DateUtils;
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import org.apache.commons.lang.math.NumberUtils;
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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.apache.http.HttpStatus;
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import org.apache.http.client.methods.CloseableHttpResponse;
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import org.apache.http.client.methods.HttpGet;
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import org.apache.http.impl.client.HttpClients;
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import org.dom4j.Document;
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import org.dom4j.Node;
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import org.dom4j.io.SAXReader;
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import org.springframework.core.io.ClassPathResource;
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import org.springframework.core.io.Resource;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.ResponseBody;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.stream.StreamResult;
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import javax.xml.transform.stream.StreamSource;
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import java.io.StringWriter;
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@Controller
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public class OaiExplorerInternalController {
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private final static Resource oaiXslt = new ClassPathResource("/eu/dnetlib/functionality/modular/ui/xslt/oai.xslt");
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private static final Log log = LogFactory.getLog(OaiExplorerInternalController.class);
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@RequestMapping("/ui/oai_verb")
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public @ResponseBody String oaiVerb(@RequestBody(required=true) OaiRequest req) throws Exception {
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return callOaiVerb(req);
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}
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@RequestMapping("/ui/test_oai_verb")
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public @ResponseBody ResponseDetails testOaiVerb(@RequestBody final OaiRequest req) throws Exception {
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final ResponseDetails response = new ResponseDetails();
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final Document doc = callOaiVerb(req, response);
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if (response.isValid() && doc != null) {
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final OaiRequest nextCall = new OaiRequest();
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nextCall.setBaseUrl(req.getBaseUrl());
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if ("Identify".equals(req.getVerb())) {
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nextCall.setVerb("ListSets");
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} else if ("ListSets".equals(req.getVerb())) {
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nextCall.setVerb("ListMetadataFormats");
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} else if ("ListMetadataFormats".equals(req.getVerb())) {
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nextCall.setVerb("ListRecords");
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if (doc.selectSingleNode("//*[local-name()='metadataPrefix' and text()='oai_dc']") != null) {
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nextCall.setMdf("oai_dc");
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} else {
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nextCall.setMdf(doc.selectSingleNode("//*[local-name()='metadataPrefix']").getText());
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}
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} else if ("ListRecords".equals(req.getVerb())) {
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nextCall.setVerb("ListIdentifiers");
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nextCall.setMdf(req.getMdf());
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} else if ("ListIdentifiers".equals(req.getVerb())) {
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nextCall.setVerb("GetRecord");
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nextCall.setMdf(req.getMdf());
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nextCall.setId(doc.selectSingleNode("//*[local-name()='identifier']").getText());
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} else if ("GetRecord".equals(req.getVerb())) {
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// NOTHING
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}
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response.setNextCall(nextCall);
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}
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return response;
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}
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@RequestMapping("/ui/test_harvesting")
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public @ResponseBody ResponseDetails testHarvesting(@RequestBody final OaiRequest req) throws Exception {
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final ResponseDetails response = new ResponseDetails();
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final Document doc = callOaiVerb(req, response);
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if (response.isValid() && doc != null) {
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final Node node = doc.selectSingleNode("//*[local-name() = 'resumptionToken']");
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if (node != null) {
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response.setSize(doc.selectNodes("//*[local-name()='" + req.getVerb() + "']/*[local-name() != 'resumptionToken']").size());
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response.setCursor(NumberUtils.toInt(node.valueOf("@cursor"), -1));
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response.setTotal(NumberUtils.toInt(node.valueOf("@completeListSize"), -1));
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final OaiRequest nextCall = new OaiRequest();
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nextCall.setBaseUrl(req.getBaseUrl());
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nextCall.setVerb(req.getVerb());
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nextCall.setToken(node.getText());
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response.setNextCall(nextCall);
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}
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}
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return response;
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}
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private String callOaiVerb(final OaiRequest req) throws Exception {
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final HttpGet method = new HttpGet(!req.toQueryParams().isEmpty() ? req.getBaseUrl() + "?" + Joiner.on("&").join(req.toQueryParams()) : req.getBaseUrl());
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method.addHeader("Content-type", "text/xml; charset=UTF-8");
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try(CloseableHttpResponse response = HttpClients.createDefault().execute(method)) {
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int responseCode = response.getStatusLine().getStatusCode();
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if (HttpStatus.SC_OK != responseCode) {
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log.error("Error downloading from baseUrl: " + req.getBaseUrl());
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throw new RuntimeException("Error: " + responseCode);
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}
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final TransformerFactory tfactory = TransformerFactory.newInstance();
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final Transformer transformer = tfactory.newTransformer(new StreamSource(oaiXslt.getInputStream()));
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final StringWriter output = new StringWriter();
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transformer.transform(new StreamSource(response.getEntity().getContent()), new StreamResult(output));
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return output.toString();
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}
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}
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private Document callOaiVerb(final OaiRequest req, final ResponseDetails details) {
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final HttpGet method = new HttpGet(!req.toQueryParams().isEmpty() ? req.getBaseUrl() + "?" + Joiner.on("&").join(req.toQueryParams()) : req.getBaseUrl());
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method.addHeader("Content-type", "text/xml; charset=UTF-8");
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Document doc = null;
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final long start = DateUtils.now();
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try(CloseableHttpResponse response = HttpClients.createDefault().execute(method)) {
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int responseCode = response.getStatusLine().getStatusCode();
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details.setHttpCode(responseCode);
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details.setValid(HttpStatus.SC_OK == responseCode);
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if (HttpStatus.SC_OK == responseCode) {
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try {
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doc = new SAXReader().read(response.getEntity().getContent());
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} catch (Exception e) {
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details.setValid(false);
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details.setError(e.getMessage());
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}
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}
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} catch (Exception e) {
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details.setValid(false);
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details.setError(e.getMessage());
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}
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details.setTime(DateUtils.now() - start);
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details.setVerb(req.getVerb());
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return doc;
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}
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}
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