D-Net

package eu.dnetlib.openaire.usermanagement;

import com.google.gson.Gson;

import org.apache.commons.io.IOUtils;

import org.apache.http.HttpHeaders;

import org.apache.http.HttpResponse;

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

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

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

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

import org.apache.log4j.Logger;

import org.mitre.openid.connect.client.service.impl.StaticClientConfigurationService;

import org.mitre.openid.connect.model.OIDCAuthenticationToken;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.security.core.context.SecurityContextHolder;

import org.springframework.web.context.support.SpringBeanAutowiringSupport;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.nio.charset.StandardCharsets;

import java.util.ArrayList;

import java.util.List;

public class PersonalTokenServlet extends HttpServlet {

    @Value("${oidc.secret}")

    private String secret;

    @Value("${oidc.id}")

    private String id;

    @Value("${oidc.issuer}")

    private String issuer;

    @Autowired

    private StaticClientConfigurationService staticClientConfigurationService;

    private Logger logger = Logger.getLogger(PersonalTokenServlet.class);

    public void init(ServletConfig config) throws ServletException {

        super.init(config);

        SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this,

                config.getServletContext());

    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        response.setContentType("text/html");

        OIDCAuthenticationToken authentication = (OIDCAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();

        StringBuilder name = new StringBuilder().append(authentication.getUserInfo().getGivenName().charAt(0));

        name.append(authentication.getUserInfo().getFamilyName().charAt(0));

        request.getSession().setAttribute("name", name.toString());

        request.getSession().setAttribute("accessToken", authentication.getAccessTokenValue());

        request.getSession().setAttribute("refreshToken", authentication.getRefreshTokenValue());

        request.getRequestDispatcher("./personal.jsp").include(request, response);

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {

        OIDCAuthenticationToken authentication = (OIDCAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();

        String refreshToken = authentication.getRefreshTokenValue();

        List<String> oldRefreshTokens = null;

        try {

            oldRefreshTokens = getOldRefreshTokens(authentication.getRefreshTokenValue(), authentication.getAccessTokenValue());

            deleteOldRefreshTokens(oldRefreshTokens, authentication.getAccessTokenValue());

        } catch (IOException e) {

            logger.error("Error deleting old refresh tokens.", e);

            //TODO should I let user know?

        }

        request.getSession().setAttribute("showRefreshToken", true);

        response.sendRedirect("./personalToken");

    }

    private void deleteOldRefreshTokens(List<String> oldRefreshTokens, String accessToken) throws IOException {

        HttpDelete httpDelete;

        CloseableHttpClient httpclient = HttpClients.createDefault();

        for (String refreshTokenId:oldRefreshTokens) {

            httpDelete = new HttpDelete(issuer + "/api/tokens/refresh/" + refreshTokenId);

            httpDelete.setHeader(HttpHeaders.AUTHORIZATION, "Bearer " + accessToken);

            HttpResponse response = httpclient.execute(httpDelete);

            if (response.getStatusLine().getStatusCode()!=200) {

                logger.warn("Could not delete old refresh tokens." + response.getStatusLine().getStatusCode());

                //System.out.println("Could not delete old refresh tokens." + response.getStatusLine().getStatusCode());//TODO should I throw exception?

            }

        }

    }

    private List<String> getOldRefreshTokens(String currentRefreshToken, String accessToken) throws IOException {

        HttpGet httpGet = new HttpGet(issuer + "/api/tokens/refresh");

        httpGet.setHeader(HttpHeaders.AUTHORIZATION, "Bearer " + accessToken);

        CloseableHttpClient httpclient = HttpClients.createDefault();

        String jsonResponse = IOUtils.toString(httpclient.execute(httpGet).getEntity().getContent(), StandardCharsets.UTF_8.name());

        Gson gson = new Gson();

        List<String> oldRefreshTokens = null;

        for(RefreshToken refreshToken:gson.fromJson(jsonResponse, RefreshToken[].class)){

            if (oldRefreshTokens == null) {

                oldRefreshTokens = new ArrayList<>();

            }

            if (!refreshToken.getValue().equals(currentRefreshToken)) {

                oldRefreshTokens.add(refreshToken.getId()+"");

            }

        }

        return oldRefreshTokens;

    }

}