61 lines
2.0 KiB
Java
61 lines
2.0 KiB
Java
package de.hsel.spm.baudas.web;
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import org.jetbrains.annotations.NotNull;
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import javax.servlet.RequestDispatcher;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.stream.Stream;
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/**
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* authenticates users.
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*
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* @author Edgar Schkrob
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* @version 0.1
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* @since 1.0
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*/
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@WebServlet("/login")
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public class LoginServlet extends HttpServlet {
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/**
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* reads from HTTP POST parameter 'password' and compares it.
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*
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* @param request request object
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* @param response response object
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* @throws IOException failed to initialize print writer
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*/
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@Override
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protected void doPost(@NotNull HttpServletRequest request, @NotNull HttpServletResponse response) throws ServletException, IOException {
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List<String> list = new ArrayList<>();
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try (Stream<String> lines = Files.lines(Paths.get("password.txt"), StandardCharsets.UTF_8)) {
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lines.forEach(list::add);
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}
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String pw = list.get(0);
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String password = request.getParameter("password");
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if (pw.equals(password)) {
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HttpSession newSession = request.getSession(true);
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newSession.setAttribute("authentication", true);
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newSession.setMaxInactiveInterval(5 * 60 * 60); //setting session to expire in 5 hours
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response.sendRedirect("index.jsp");
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} else {
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RequestDispatcher rd = getServletContext().getRequestDispatcher("/login.jsp");
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PrintWriter out = response.getWriter();
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rd.include(request, response);
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out.print("<script>$('#wrong_password').removeClass('hide')</script>");
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}
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}
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}
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