add controlleradvice modelattribute setting

src/main/java/mops/gruppen2/controller/ModelAttributeControllerAdvice.java

@@ -0,0 +1,35 @@
+package mops.gruppen2.controller;
+
+import mops.gruppen2.domain.Account;
+import mops.gruppen2.domain.GroupType;
+import mops.gruppen2.domain.Role;
+import mops.gruppen2.domain.User;
+import mops.gruppen2.domain.Visibility;
+import org.keycloak.adapters.springsecurity.token.KeycloakAuthenticationToken;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ModelAttribute;
+
+@ControllerAdvice
+public class ModelAttributeControllerAdvice {
+
+    // Add modelAttributes before each @RequestMapping
+    @ModelAttribute
+    public void modelAttributes(KeycloakAuthenticationToken token,
+                                Model model) {
+
+        // Prevent NullPointerException if not logged in
+        if (token != null) {
+            model.addAttribute("account", new Account(token));
+            model.addAttribute("user", new User(token));
+        }
+
+        model.addAttribute("member", Role.MEMBER);
+        model.addAttribute("admin", Role.ADMIN);
+        model.addAttribute("public", Visibility.PUBLIC);
+        model.addAttribute("private", Visibility.PRIVATE);
+        model.addAttribute("lecture", GroupType.LECTURE);
+        model.addAttribute("simple", GroupType.SIMPLE);
+    }
+
+}