package servlets;

import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import utils.LoginMethod;
import utils.SamlSso;
import utils.ShepherdLogManager;

/**
 * Does SSO login. <br>
 * <br>
 * This file is part of the Security Shepherd Project.
 *
 * <p>The Security Shepherd project is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.<br>
 *
 * <p>The Security Shepherd project is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details.<br>
 *
 * <p>You should have received a copy of the GNU General Public License along with the Security
 * Shepherd project. If not, see <http://www.gnu.org/licenses/>.
 *
 * @author Mark Denihan
 */
public class SSOMetadata extends HttpServlet {

  private static final long serialVersionUID = 3679066677850981985L;
  private static final Logger log = LogManager.getLogger(SSOMetadata.class);

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

    /** Redirects user to index.jsp */
    response.sendRedirect("index.jsp");
  }

  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    if (!LoginMethod.isSaml()) {
      // SSO is off (sso.enabled in sso.properties): this endpoint must not authenticate anyone,
      // even if a SAML configuration is present
      response.sendError(HttpServletResponse.SC_NOT_FOUND);
      return;
    }
    ShepherdLogManager.setRequestIp(request.getRemoteAddr(), request.getHeader("X-Forwarded-For"));

    try {
      String metadata = SamlSso.getServiceProviderMetadata();
      response.setContentType("application/xml; charset=UTF-8");
      response.getWriter().println(metadata);
    } catch (Exception e) {
      log.error("Caught exception when initializing SSO: " + e.toString());
      throw new RuntimeException(e);
    }
  }
}