PoorValidationLesson.java

package servlets.module.lesson;

import jakarta.servlet.ServletException;
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 utils.Hash;
import utils.ShepherdLogManager;
import utils.Validate;

/**
 * Poor Validation Lesson <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 PoorValidationLesson extends HttpServlet {

  private static final long serialVersionUID = 1L;
  private static final Logger log = LogManager.getLogger(PoorValidationLesson.class);
  private static String levelName = "Poor Validation Lesson";
  public static String levelhash =
      "4d8d50a458ca5f1f7e2506dd5557ae1f7da21282795d0ed86c55fefe41eb874f";
  private static String levelResult =
      "6680b08b175c9f3d521764b41349fcbd3c0ad0a76655a10d42372ebccdfdb4bb";

  /**
   * Data is only validated on the client side. No Server Side Validation is Performed
   *
   * @param userdata data submitted by user
   */
  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"));

    // 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.poorValidation", locale);

    // Attempting to recover username of session that made request
    HttpSession ses = request.getSession(true);
    if (Validate.validateSession(ses)) {
      ShepherdLogManager.setRequestIp(
          request.getRemoteAddr(),
          request.getHeader("X-Forwarded-For"),
          ses.getAttribute("userName").toString());
      log.debug(levelName + " servlet accessed by: " + ses.getAttribute("userName").toString());
      PrintWriter out = response.getWriter();
      out.print(getServletInfo());
      try {
        String userData = request.getParameter("userdata");
        log.debug("User Submitted - " + userData);
        String htmlOutput = new String();
        int userNumber = Integer.parseInt(userData);
        if (userNumber < 0) {
          // Get key and add it to the output
          String userKey =
              Hash.generateUserSolution(levelResult, (String) ses.getAttribute("userName"));
          log.debug("Negative Number Submitted");
          htmlOutput =
              "<h2 class='title'>"
                  + bundle.getString("result.validationBypassed")
                  + "</h2><p>"
                  + bundle.getString("result.youDidIt")
                  + ". "
                  + bundle.getString("result.resultKey")
                  + ": <a>"
                  + userKey
                  + "</a></p>";
        } else {
          log.debug("Valid Number Submitted");
          htmlOutput =
              "<h2 class='title'>"
                  + bundle.getString("response.validNumber")
                  + "</h2><p>"
                  + bundle.getString("response.theNumber")
                  + " "
                  + userNumber
                  + " "
                  + bundle.getString("response.valid")
                  + ".";
        }
        log.debug("Outputting HTML");
        out.write(htmlOutput);
      } catch (Exception e) {
        out.write(errors.getString("error.funky"));
        log.fatal(levelName + " - " + e.toString());
      }
    } else {
      log.error(levelName + " servlet accessed with no session");
    }
  }
}