D-Net

package eu.dnetlib.data.collector.plugins.fairsharing;

import java.io.UnsupportedEncodingException;

import org.apache.commons.io.IOUtils;

import org.apache.commons.lang3.StringUtils;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.apache.http.HttpEntity;

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.entity.StringEntity;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.json.JSONObject;

import eu.dnetlib.data.collector.plugin.AbstractCollectorPlugin;

import eu.dnetlib.data.collector.rmi.CollectorServiceException;

import eu.dnetlib.data.collector.rmi.InterfaceDescriptor;

public class FairSharingPlugin extends AbstractCollectorPlugin {

	private static final int PAGE_SIZE = 100;

	private static final Log log = LogFactory.getLog(FairSharingPlugin.class); // NOPMD by marko on 11/24/08 5:02 PM

	// Suggested values:

	// baseUrl = https://api.fairsharing.org

	// XPATH_ID = /record/id

	@Override

	public Iterable<String> collect(final InterfaceDescriptor interfaceDescriptor, final String fromDate, final String untilDate)

		throws CollectorServiceException {

		final String baseUrl = interfaceDescriptor.getBaseUrl();

		final String login = interfaceDescriptor.getParams().get("login");

		final String password = interfaceDescriptor.getParams().get("password");

		final String authCode = login(baseUrl, login, password);

		log.debug("authCode: " + authCode);

		if (StringUtils.isBlank(authCode)) { throw new CollectorServiceException("Authorization failed: authCode is empty"); }

		return () -> new FairSharingIterator(baseUrl, authCode, PAGE_SIZE);

	}

	private String login(final String baseUrl, final String login, final String password) throws CollectorServiceException {

		final HttpPost req = new HttpPost(baseUrl + "/users/sign_in");

		req.addHeader("Accept", "application/json");

		req.addHeader("Content-Type", "application/json");

		req.setEntity(prepareCredentials(login, password));

		try (final CloseableHttpClient client = HttpClients.createDefault()) {

			try (final CloseableHttpResponse response = client.execute(req)) {

				final String content = IOUtils.toString(response.getEntity().getContent());

				final JSONObject obj = new JSONObject(content);

				return obj.getString("jwt");

			}

		} catch (final Exception e) {

			throw new CollectorServiceException("Error perfoming login", e);

		}

	}

	public HttpEntity prepareCredentials(final String login, final String password) throws CollectorServiceException {

		final JSONObject objUser = new JSONObject();

		objUser.put("login", login);

		objUser.put("password", password);

		final JSONObject objCredentials = new JSONObject();

		objCredentials.put("user", objUser);

		try {

			return new StringEntity(objCredentials.toString());

		} catch (final UnsupportedEncodingException e) {

			throw new CollectorServiceException("Error preparing http entity for login");

		}

	}

}