Checking and Handling if trying to Reset password of unregistered emails

If the email do not exists the user can't proceed in resetting the password

src/main/java/controller/SendResetPin.java

@@ -1,6 +1,8 @@
 package controller;
 
+import model.entity.User;
 import model.service.login.Authenticator;
+import model.service.user.UserData;
 
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
@@ -12,10 +14,15 @@
 public class SendResetPin extends HttpServlet {
     public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
         String email = request.getParameter("email");
-        String pin = new Authenticator().resetPassword(email);
-        // Store the pin and email in the session for future comparison
-        // Send back a result
+        UserData checker = new UserData();
+
         response.setContentType("text/plain");
-        response.getWriter().println(pin);
+        if(checker.checkIfEmailExists(email)){
+            String pin = new Authenticator().resetPassword(email);
+            response.getWriter().println(pin);
+        }
+        else {
+            response.getWriter().println("NA");
+        }
     }
 }

src/main/webapp/JS/login.js

@@ -39,6 +39,7 @@ $(document).ready(function startUp() {
     $("#forgotPassword").click(handleForgotPassword);
 
     let sessionPin;
+    /*
     $("#sendPin").click((event) => {
         event.preventDefault();
         $.post(`${contextPath}/login/reset`, {email: resetEmail.val()}, function(response) {
@@ -47,6 +48,21 @@ $(document).ready(function startUp() {
             resetStep2.show();
         });
     });
+    */
+    $("#sendPin").click((event) => {
+        event.preventDefault();
+        $.post(`${contextPath}/login/reset`, {email: resetEmail.val()}, function(response) {
+            response = response.trim(); // Trim the response
+            if(response == "NA") {
+                // Here, the servlet will return "NA" if it could not find the email
+                alert("Email non registrata nel nostro sistema. Verificane la correttezza");
+            } else {
+                sessionPin = response; // Save the response, which should be your pin
+                resetStep1.hide();
+                resetStep2.show();
+            }
+        });
+    });
 
     $("#confirmPin").click((event) => {
         event.preventDefault();