需求背景

使用spark sql形式操作hive库表数据时，hive-site.xml中的钩子函数不会执行，原因是spark操作hive是独立操作的，简单理解就是spark利用hive的jar方法之间访问底层数据文件。
spark sql访问自己的库表，权限如何控制，实现思路和hive权限控制思路一样，在执行spark sql之前解析sql，校验权限，修改SparkSession中的sql方法

/**
   * Executes a SQL query using Spark, returning the result as a `DataFrame`.
   * The dialect that is used for SQL parsing can be configured with 'spark.sql.dialect'.
   *
   * @since 2.0.0
   */
  def sql(sqlText: String): DataFrame = {
    val osName = System.getProperty("user.name")
    if (!"hadoop".equals(osName)) {
      propertiesFile = Option(propertiesFile).getOrElse(Utils.getDefaultPropertiesFile(sys.env))
      val properties = Utils.getPropertiesFromFile(propertiesFile)
      val clusterType: String = properties.get("permissions.cluster.type").get
      val checkUrl: String = properties.get("permissions.check.url").get

      if (clusterType == null || checkUrl == null) {
        log.error(s"clusterType is ${clusterType},checkUrl is ${checkUrl}")
        throw new Exception(s"clusterType or checkUrl is null")
      }

      val sparkUser = sparkContext.sparkUser
      val command = sqlText;
      val databaseCurrentName = this.sessionState.catalog.getCurrentDatabase
      log.info("-------------------------")
      log.info("user:" + sparkUser)
      log.info("sqlText:" + sqlText)
      log.info("currentDatabase:" + this.catalog.currentDatabase)
      log.info("sessionState currentDatabase:" + this.sessionState.catalog.getCurrentDatabase)
      log.info("clusterType:" + clusterType)
      log.info("checkUrl:" + checkUrl)
      log.info("-------------------------")
      val tempViews = sessionState.catalog.getTempViews()
      val checkPermissionModel = new CheckPermissionModel
      checkPermissionModel.setCommand(command)
      checkPermissionModel.setUserName(sparkUser)
      checkPermissionModel.setDatabaseCurrentName(databaseCurrentName)
      checkPermissionModel.setTempViews(tempViews)
      checkPermissionModel.setClusterType(ClusterType.valueOf(clusterType))
      checkPermissionModel.setRequestType(RequestType.SPARK_REQUEST)

      val post = HttpTools.sendPost(checkUrl, JacksonTools.obj2json(checkPermissionModel))
      val result = JacksonTools.json2pojo(post, classOf[Result])
      val status = result.getStatus
      if ("0" == status) throw new Exception("request validate permission failed...")
      val obj = result.getObj;
      val model = JacksonTools.json2pojo(JacksonTools.obj2json(obj), classOf[CheckPermissionModel])
      val validateFlag = model.isValidateFlag
      if (!validateFlag) {
        val msg = "user:" + sparkUser + " has not permissions " + "error message :" + model.getMsg()
        throw new Exception(msg)
      }
    }
    Dataset.ofRows(self, sessionState.sqlParser.parsePlan(sqlText))
  }

注意spark创建的临时表，默认哪个用户创建的拥有所有权限，修改SessionCatalog类，添加获取当前用户创建的所有临时表

/**
   * Return a local temporary views.
   */
  def getTempViews(): util.ArrayList[String] = synchronized {
    val list = new util.ArrayList[String]();
    tempViews.keys.foreach({ p =>
      list.add(p)
    })
    list
  }

调用权限校验服务，返回校验结果