/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.connector.thrift;

import com.facebook.presto.spi.ConnectorSession;
import com.google.common.collect.ImmutableMap;

import java.util.Map;

import static com.facebook.presto.connector.thrift.ThriftSessionProperties.isUseIdentityThriftHeader;

public class DefaultThriftHeaderProvider
        implements ThriftHeaderProvider
{
    private static final String PRESTO_CONNECTOR_IDENTITY_USER = "presto_connector_user";

    @Override
    public Map<String, String> getHeaders(ConnectorSession session)
    {
        if (isUseIdentityThriftHeader(session)) {
            return ImmutableMap.of(PRESTO_CONNECTOR_IDENTITY_USER, session.getUser());
        }
        return ImmutableMap.of();
    }
}
