# -*- coding:utf-8 -*-
#############################################################################
# Portions Copyright (c) 2020 Huawei Technologies Co.,Ltd.
# Portions Copyright (c) 2007 Agendaless Consulting and Contributors.
#
# openGauss is licensed under Mulan PSL v2.
# You can use this software according to the terms
# and conditions of the Mulan PSL v2.
# You may obtain a copy of Mulan PSL v2 at:
#
#          http://license.coscl.org.cn/MulanPSL2
#
# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OF ANY KIND,
# EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
# MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
# See the Mulan PSL v2 for more details.
# ----------------------------------------------------------------------------
# Description  : sshd config file operation.
#############################################################################

import subprocess

from gspylib.common.ErrorCode import ErrorCode


class SshdConfig:
    """
    sshd config file operation
    """

    def __init__(self):
        pass

    @staticmethod
    def setKeyValueInSshd(key, value):
        """
        function: Set a (key, value) pair into /etc/ssh/sshd_config,
        before "Match" section.
                "Match" section in sshd_config should always places in the end.
                Attention: you need to remove the old (key, value)
                from sshd_config manually.
        input:
            key: the configuration name of sshd_config
            value: the configuration value(Only single line string
            permitted here).
        output:
            void
        """
        sshd_config = '/etc/ssh/sshd_config'
        cmd = "grep -E '^\<Match\>' %s" % sshd_config
        (status, output) = subprocess.getstatusoutput(cmd)

        if status == 0:
            cmd = "sed -i '/^\<Match\>.*/i %s %s' %s" % (key, value,
                                                         sshd_config)
        else:
            if output is not None and len(output.strip()) != 0:
                raise Exception(ErrorCode.GAUSS_503["GAUSS_50321"] %
                                "Match section" + "Command: %s, Error: %s" %
                                (cmd, output))
            cmd = "echo '' >> %s ; echo '%s %s' >> %s" % (sshd_config,
                                                          key, value,
                                                          sshd_config)

        (status, output) = subprocess.getstatusoutput(cmd)
        if status != 0:
            raise Exception((ErrorCode.GAUSS_503["GAUSS_50320"] % (
                key, value)) + ("Command: %s, Error: %s" % (cmd, output)))