add admin interface, angular migration

src/app/auth/auth.guard.ts

@@ -104,4 +104,30 @@ export class AnonymousGuard implements CanActivate {
         });
     }
 
+}
+
+@Injectable({
+    providedIn: 'root'
+})
+export class AdminGuard implements CanActivate {
+    constructor(private authService: AuthService, private router: Router) { }
+
+    canActivate(next: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
+        const that = this;
+        return this.authService.getAuth().then((data: any) => {
+            if (!data.authenticated) {
+                return that.router.navigateByUrl(that.router.parseUrl('/login?target=' + encodeURIComponent(state.url)), { skipLocationChange: true, replaceUrl: true });
+            }
+            
+            // Check if user has ROLE_ADMIN
+            if (data.authorities && data.authorities.some((auth: any) => auth.authority === 'ROLE_ADMIN')) {
+                return true;
+            }
+            
+            // User is authenticated but not an admin
+            return that.router.navigateByUrl('/account/info');
+        }).catch(function (error) {
+            return that.router.navigateByUrl(that.router.parseUrl('/unavailable?target=' + encodeURIComponent(state.url)), { skipLocationChange: true });
+        });
+    }
 }