source: src/main/java/mk/ukim/finki/wp/db/controller/PageController.java

package mk.ukim.finki.wp.db.controller;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class PageController {

    @GetMapping("/")
    public String getIndexPage(Model model, Authentication authentication) {
        boolean loggedIn = authentication != null && authentication.isAuthenticated();
        model.addAttribute("loggedIn", loggedIn);

        String userRole = null;

        if (loggedIn) {
            userRole = authentication.getAuthorities().stream()
                    .map(GrantedAuthority::getAuthority)
                    .findFirst()
                    .orElse(null);
        }

        model.addAttribute("userRole", userRole);
        return "index";
    }
}