ClientsDAO.java

package it.inaf.ia2.gms.persistence;

import it.inaf.ia2.gms.persistence.model.ClientEntity;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;

@Component
public class ClientsDAO {

    private final JdbcTemplate jdbcTemplate;

    @Autowired
    public ClientsDAO(DataSource dataSource) {
        jdbcTemplate = new JdbcTemplate(dataSource);
    }

    public Optional<ClientEntity> findClientById(String clientId) {

        String sql = "SELECT client_secret, allowed_actions, ip_filter FROM gms_client WHERE client_id = ?";

        return jdbcTemplate.query(conn -> {
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1, clientId);
            return ps;
        }, resultSet -> {
            if (resultSet.next()) {
                ClientEntity client = new ClientEntity();
                client.setId(clientId);
                client.setSecret(resultSet.getString("client_secret"));
                client.setAllowedActions(getAllowedActions(resultSet));
                client.setIpFilter(resultSet.getString("ip_filter"));
                return Optional.of(client);
            }
            return Optional.empty();
        });
    }

    private List<String> getAllowedActions(ResultSet resultSet) throws SQLException {

        List<String> actions = new ArrayList<>();

        ResultSet items = resultSet.getArray("allowed_actions").getResultSet();
        while (items.next()) {
            String action = items.getString(1);
            actions.add(action);
        }

        return actions;
    }
}