5分钟后自动令牌过期Java

Question

我正在尝试创建一种更安全的方法来在没有任何框架的情况下使用 Java Web 和 HSQLDB 重置忘记的密码。

我创建了一个表单，用户可以在其中插入他的电子邮件，如果电子邮件在数据库中，它将自动发送一封带有密码重置链接的电子邮件。该链接有一个特定的令牌，当每个用户单击接收电子邮件的按钮时，该令牌会为他们创建。这个令牌被插入到数据库中，同时也是它创建时的时间戳。

如果令牌达到 5 分钟的限制时间，我会尝试从数据库中删除令牌，但它不起作用。 有没有办法做到这一点？谢谢。

我的表：

CREATE TABLE user (
id bigint identity NOT NULL,
username varchar(50) NOT NULL,
email varchar(50) NOT NULL,
password varchar(50) NOT NULL,
attempts int DEFAULT 3,
state varchar(50) DEFAULT 'Active’,
reset_token uuid,
time_token TIMESTAMP,
PRIMARY KEY (id)
);

令牌生成器：

public class TokenGenerator {
    public static String UniqueToken() {
    String token = UUID.randomUUID().toString();
    return token;

}}

我的班级ForgotPasswordHandler.java：

public class ForgotPasswordHandler {
    private static PreparedStatement ps = null;
    private static ResultSet rs = null;
    private static Connection con = DBConnectionManager.getConnection();

    //Creates a token for the user when it clicks on submit for forgot password
        public static void CreateToken (String email) {


            try
              { 

              if (con == null){
                 System.out.println("Failed connection");

              }else{
                  String token = TokenGenerator.UniqueToken();


                PreparedStatement ps = con.prepareStatement(
                  "UPDATE user SET reset_token = ?, time_token = ? WHERE email = ?");

                ps.setString(1,token);
                ps.setTimestamp(2,new Timestamp(new Date().getTime()));
                ps.setString(3, email);

                ps.executeUpdate();
                ps.close();


              }}
            catch (Exception e) {
                 e.printStackTrace(System.out);

              }
        }


       //This is where I'm having trouble to delete the actual token after 5 minutes.

        public static void DeleteToken() {

            try
              { 

              if (con == null){
                 System.out.println("Failed Connection");

              }else{



                PreparedStatement ps = con.prepareStatement(
                  "UPDATE user SET reset_token = NULL WHERE time_token < NOW() - INTERVAL 5 MINUTE");


                ps.executeUpdate();
                ps.close();


              }}
            catch (Exception e) {
                 e.printStackTrace(System.out);

              }

        }

}

我的 Servlet ForgotPassword.java:

    public class ForgotPassword extends HttpServlet {
        private static final long serialVersionUID = 1L;
        private String host;
        private String port;
        private String email;
        private String name;
        private String pass;

        public void init() {
            // reads SMTP server setting from web.xml file
            ServletContext context = getServletContext();
            host = context.getInitParameter("host");
            port = context.getInitParameter("port");
            email = context.getInitParameter("email");
            name = context.getInitParameter("name");
            pass = context.getInitParameter("pass");
        }



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

                //verify if emails exists in db

                String email = request.getParameter("email");

                if(!UserReset.EmailCheck(email)) {

                    String message = "This email isn't in our database";
                    request.setAttribute("message", message);
                    request.getRequestDispatcher("reset.jsp").forward(request, response);   

                } else {
                    String recipient = request.getParameter("email");
                    String subject = "Your Password has been reset";



                    String token = TokenGenerator.UniqueToken();
                    ForgotPasswordHandler.CreateToken(email);
                    ForgotPasswordHandler.DeleteToken();    

                    String url = "http://localhost:8080/login/reset-password.jsp?token=" + token;
                    UserReset.RefreshState(email);

                    //Builds email message and sends it
                    String content = "Hello, please change your password in this link:" + url;
                    content += "\nObrigado!";

                    String message = "";

                    try {
                        EmailSender.sendEmail(host, port, email, name, pass,
                                recipient, subject, content);
                        message = "Please verify your email.";
                    } catch (Exception ex) {
                        ex.printStackTrace();
                        message = "Ops, an error occured: " + ex.getMessage();
                    } finally {
                        request.setAttribute("message", message);
                        request.getRequestDispatcher("reset.jsp").forward(request, response);
                    }

                }

    }

}

Answer 1

您可能不应该主动删除令牌。只需记录下token的时间，然后当有新的查询进来的时候，获取创建时间，检查是否在5分钟以内。