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from __future__ import absolute_import

from airflow.configuration import conf
from airflow.upgrade.rules.base_rule import BaseRule


class LegacyUIDeprecated(BaseRule):
    title = "Legacy UI is deprecated by default"

    description = "Legacy UI is deprecated. FAB RBAC is enabled by default in order to increase security."

    def check(self):
        if conf.has_option("webserver", "rbac"):
            rbac = conf.get("webserver", "rbac")
            if rbac == "false":
                return (
                    "rbac in airflow.cfg must be explicitly set empty as"
                    " RBAC mechanism is enabled by default."
                )
