package servlets.module.lesson;

import dbProcs.Getter;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.Cookie;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Locale;
import java.util.ResourceBundle;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.owasp.encoder.Encode;
import utils.FindXSS;
import utils.Hash;
import utils.ShepherdLogManager;
import utils.Validate;

/**
 * CSRF Lesson Currently does not use user specific result key because of current CSRF blanket rule
 * <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 CsrfLesson extends HttpServlet {

  private static final long serialVersionUID = 1L;
  private static final Logger log = LogManager.getLogger(CsrfLesson.class);
  private static String levelName = "CSRF Lesson";
  private static String levelHash =
      "ed4182af119d97728b2afca6da7cdbe270a9e9dd714065f0f775cd40dc296bc7";

  /**
   * User submission is parsed for a valid HTML IMG tag. The SRC attribute of this tag is then used
   * to construct a URL object. This URL object is then checked to ensure a valid attack
   *
   * @param falseId User's session stored tempId
   * @param messageForAdmin CSRF Submission
   */
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    // Setting IpAddress To Log and taking header for original IP if forwarded from proxy
    ShepherdLogManager.setRequestIp(request.getRemoteAddr(), request.getHeader("X-Forwarded-For"));
    log.debug(levelName + " Servlet Accessed");

    // Translation Stuff
    Locale locale = new Locale(Validate.validateLanguage(request.getSession()));
    ResourceBundle errors = ResourceBundle.getBundle("i18n.servlets.errors", locale);
    ResourceBundle bundle = ResourceBundle.getBundle("i18n.servlets.lessons.csrfLesson", locale);

    PrintWriter out = response.getWriter();
    out.print(getServletInfo());

    try {
      HttpSession ses = request.getSession(true);
      if (Validate.validateSession(ses)) {
        ShepherdLogManager.setRequestIp(
            request.getRemoteAddr(),
            request.getHeader("X-Forwarded-For"),
            ses.getAttribute("userName").toString());
        log.debug("Current User: " + ses.getAttribute("userName").toString());
        Cookie tokenCookie = Validate.getToken(request.getCookies());
        Object tokenParmeter = request.getParameter("csrfToken");
        if (Validate.validateTokens(tokenCookie, tokenParmeter)) {
          String falseId = (String) ses.getAttribute("falseId");
          log.debug("falseId = " + falseId);
          String messageForAdmin = request.getParameter("messageForAdmin").toLowerCase();
          log.debug("User Submitted - " + messageForAdmin);

          String htmlOutput = new String();
          boolean validLessonAttack =
              FindXSS.findCsrfAttackUrl(
                  messageForAdmin, "/root/grantComplete/csrflesson", "userId", falseId);

          if (validLessonAttack) {
            htmlOutput =
                "<h2 class='title'>"
                    + bundle.getString("result.wellDone")
                    + "</h2>"
                    + bundle.getString("result.youDidIt")
                    + "<br />"
                    + bundle.getString("result.theKeyIs")
                    + " <a>"
                    + Hash.generateUserSolution(
                        Getter.getModuleResultFromHash(
                            getServletContext().getRealPath(""), levelHash),
                        (String) ses.getAttribute("userName"))
                    + "</a>";
          }
          log.debug("Adding searchTerm to Html: " + messageForAdmin);
          htmlOutput +=
              "<h2 class='title'>"
                  + bundle.getString("challenge.messageSent")
                  + "</h2>"
                  + "<p><table><tr><td>"
                  + bundle.getString("challenge.sentTo")
                  + ": </td><td>administrator@SecurityShepherd.com</td></tr>"
                  + "<tr><td>"
                  + bundle.getString("challenge.message")
                  + ": </td><td> "
                  + "<img src=\""
                  + Encode.forHtmlAttribute(messageForAdmin)
                  + "\"/>"
                  + "</td></tr></table></p>";
          log.debug("Outputting HTML");
          out.write(htmlOutput);
        }
      }
    } catch (Exception e) {
      out.write(errors.getString("error.funky"));
      log.fatal(levelName + " - " + e.toString());
    }
    log.debug("End of " + levelName + " Servlet");
  }
}