91 lines
2.4 KiB
Java
91 lines
2.4 KiB
Java
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package eu.dnetlib.dhp.provision.update;
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import java.io.ByteArrayOutputStream;
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import java.util.zip.Inflater;
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import org.apache.commons.codec.binary.Base64;
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import org.apache.commons.io.IOUtils;
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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.CloseableHttpClient;
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import org.apache.http.impl.client.HttpClients;
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import com.google.gson.JsonElement;
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import com.google.gson.JsonParser;
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import eu.dnetlib.dhp.provision.scholix.ScholixResource;
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public class CrossrefClient {
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private String host;
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private String index = "crossref";
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private String indexType = "item";
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public CrossrefClient(String host) {
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this.host = host;
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}
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public String getHost() {
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return host;
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}
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public void setHost(String host) {
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this.host = host;
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}
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public String getIndex() {
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return index;
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}
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public void setIndex(String index) {
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this.index = index;
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}
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public String getIndexType() {
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return indexType;
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}
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public void setIndexType(String indexType) {
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this.indexType = indexType;
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}
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private static String decompressBlob(final String blob) {
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try {
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byte[] byteArray = Base64.decodeBase64(blob.getBytes());
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final Inflater decompresser = new Inflater();
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decompresser.setInput(byteArray);
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final ByteArrayOutputStream bos = new ByteArrayOutputStream(byteArray.length);
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byte[] buffer = new byte[8192];
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while (!decompresser.finished()) {
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int size = decompresser.inflate(buffer);
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bos.write(buffer, 0, size);
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}
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decompresser.end();
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return bos.toString();
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} catch (Throwable e) {
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throw new RuntimeException("Wrong record:" + blob, e);
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}
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}
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public ScholixResource getResourceByDOI(final String doi) {
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try (CloseableHttpClient client = HttpClients.createDefault()) {
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HttpGet httpGet = new HttpGet(
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String
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.format(
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"http://%s:9200/%s/%s/%s", host, index, indexType, doi.replaceAll("/", "%2F")));
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CloseableHttpResponse response = client.execute(httpGet);
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String json = IOUtils.toString(response.getEntity().getContent());
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if (json.contains("blob")) {
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JsonParser p = new JsonParser();
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final JsonElement root = p.parse(json);
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json = decompressBlob(
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root.getAsJsonObject().get("_source").getAsJsonObject().get("blob").getAsString());
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}
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return CrossRefParserJSON.parseRecord(json);
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} catch (Throwable e) {
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return null;
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}
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}
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}
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