erp-imprimelibros/src/main/java/com/imprimelibros/erp/users/UserController.java

package com.imprimelibros.erp.users;

import com.imprimelibros.erp.datatables.DataTablesResponse;

import jakarta.servlet.http.HttpServletRequest;

import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.security.access.prepost.PreAuthorize;

import com.imprimelibros.erp.datatables.DataTablesRequest;
import com.imprimelibros.erp.datatables.DataTablesParser;
import com.imprimelibros.erp.datatables.DataTable;

import java.util.Map;
import java.util.List;

@Controller
@RequestMapping("/users")
public class UserController {   

    private UserDao repo;

    public UserController(UserDao repo, UserService userService) {
        this.repo = repo;
    }

    @PreAuthorize("hasRole('ADMIN') or hasRole('SUPERADMIN')")
    @GetMapping("/")
    public DataTablesResponse<Map<String,Object>> datatable(HttpServletRequest request) {
        
        DataTablesRequest dt = DataTablesParser.from(request);

        Specification<User> base = (root, query, cb) -> cb.conjunction();
        long total = repo.count();

        return DataTable
            .of(repo, User.class, dt, List.of(
                "username", "email", "role" // campos buscables
            ))
            .where(base)
            .toJson(total);
    }
}