update[]: add session user to make it clear which user is logged in a…

…nd donates

src/main/java/edu/group5/app/control/MainController.java

@@ -1,6 +1,7 @@
 package edu.group5.app.control;
 
 import edu.group5.app.control.donationpage.DonationPageController;
+import edu.group5.app.model.user.User;
 import edu.group5.app.view.MainView;
 import edu.group5.app.view.donationpage.DonationPageView;
 
@@ -12,6 +13,7 @@ public class MainController {
   private final BrowseCardController browseCardController;
   private final OrganizationPageController organizationPageController;
   private final DonationPageController donationPageController;
+  private User currentUser;
 
   public MainController() {
     this.view = new MainView(this);
@@ -23,6 +25,19 @@ public MainController() {
     this.donationPageController = new DonationPageController(this);
   }
 
+  public void setCurrentUser(User user) {
+    this.currentUser = user;
+  }
+
+  public User getCurrentUser() {
+    return this.currentUser;
+  }
+
+  public void logout() {
+    currentUser = null;
+    showLoginPage();
+  }
+
   public MainView getMainView() {
     return view;
   }