package com.primeton.dsp.datarelease.data.bdata;


import lombok.extern.slf4j.Slf4j;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.exceptions.HBaseException;

import java.io.Closeable;
import java.io.IOException;
import java.util.Properties;
import java.util.Set;

/**
 *
 * Hive Kerberos 认证方式获得连接
 *
 *
 * <pre>
 *
 * Created by zhaopx.
 * User: zhaopx
 * Date: 2020/4/22
 * Time: 18:02
 *
 * </pre>
 *
 * @author zhaopx
 */
@Slf4j
public class Krb5HBaseConnectionServiceImpl implements HBaseConnectionService, Closeable {


    /**
     * Hive 数据源
     */
    final Properties hbaseResource;

    /**
     * HBase 链接
     */
    Connection connection;


    public Krb5HBaseConnectionServiceImpl(Properties hbaseResource) {
        this.hbaseResource = hbaseResource;
    }

    @Override
    public boolean doAuth() {
        //KrbUser = "hadoop/cdh-node1@HADOOP.COM";
        log.info("hbase 开始 kerberos 认证。");
        AuthPrincipalCreator authPrincipalCreator = AuthPrincipalCreator.useExtractorConf(hbaseResource.getProperty("authBasePath"));
        Set<String> principals = authPrincipalCreator.listPrincipals();
        log.info("find existed principals: {}", principals);
        AuthPrincipal kerberosPrincipal = authPrincipalCreator.getKerberosPrincipal(hbaseResource.getProperty("authUser"));

        String userKeytab = kerberosPrincipal.getUserKeytabFile().getAbsolutePath();
        String krb5File = kerberosPrincipal.getKrb5File().getAbsolutePath();
        String krbUser = kerberosPrincipal.getPrincipal();

        // 分别加载 core、hdfs、hbase site 文件
        Configuration conf = new Configuration();
        try {
            if (kerberosPrincipal.getCoreSite() != null) {
                conf.addResource(kerberosPrincipal.getCoreSite().toURL());
                log.info("add config: {}", kerberosPrincipal.getCoreSite().getAbsolutePath());
            }

            if (kerberosPrincipal.getHdfsSite() != null) {
                conf.addResource(kerberosPrincipal.getHdfsSite().toURL());
                log.info("add config: {}", kerberosPrincipal.getHdfsSite().getAbsolutePath());
            }

            conf.reloadConfiguration();
            Configuration hbaseConf = HBaseConfiguration.create(conf);
            if (kerberosPrincipal.getHBaseSite() != null) {
                hbaseConf.addResource(kerberosPrincipal.getHBaseSite().toURL());
                log.info("add config: {}", kerberosPrincipal.getHBaseSite().getAbsolutePath());
            }
            hbaseConf.reloadConfiguration();

            // Kerberos 认证
            KerberosUtil.loginKerberos(hbaseConf, krbUser, userKeytab, krb5File);
            connection = ConnectionFactory.createConnection(hbaseConf);
            log.info("hbase kerberos 认证通过。");
            return true;
        } catch (Exception e) {
            throw new SecurityException("HBase Kerberos 认证异常。", e);
        }
    }

    @Override
    public Admin getConnection() throws HBaseException {
        try {
            return connection.getAdmin();
        } catch (Exception e) {
            throw new HBaseException("连接 HBase 异常。", e);
        }
    }

    @Override
    public Table getTable(String tableName) throws HBaseException {
        try {
            return connection.getTable(TableName.valueOf(tableName));
        } catch (IOException e) {
            throw new HBaseException("无法获取Hbase " + tableName + " 表链接。", e);
        }
    }

    @Override
    public void close() throws IOException {
        log.info("关闭 HBase 连接。");
        if(connection != null) {
            connection.close();
        }
    }
}