##############################################################################
#
# Copyright (c) 2018 Nexedi SA and Contributors. All Rights Reserved.
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsibility of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# guarantees and support are strongly adviced to contract a Free Software
# Service Company
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 3
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
##############################################################################

import os
import contextlib
import paramiko
import subprocess

from urllib.parse import urlparse
import socket

from slapos.testing.testcase import makeModuleSetUpAndTestCaseClass
from slapos.util import bytes2str

setUpModule, SlapOSInstanceTestCase = makeModuleSetUpAndTestCaseClass(
    os.path.abspath(
        os.path.join(os.path.dirname(__file__), '..', 'software.cfg')))


class TestSSH(SlapOSInstanceTestCase):
  @classmethod
  def getInstanceParameterDict(cls):
    cls.ssh_key_list = [paramiko.ECDSAKey.generate(bits=384) for i in range(2)]
    return {
        'user-authorized-key': 'ecdsa-sha2-nistp384 {}\necdsa-sha2-nistp384 {}'.format(
          *[key.get_base64() for key in cls.ssh_key_list]
          )
    }

  def test_connect(self):
    parameter_dict = self.computer_partition.getConnectionParameterDict()
    ssh_url = parameter_dict['ssh-url']
    parsed = urlparse(ssh_url)
    self.assertEqual('ssh', parsed.scheme)

    client = paramiko.SSHClient()

    client.set_missing_host_key_policy(paramiko.client.AutoAddPolicy())
    for ssh_key in self.ssh_key_list:
      with contextlib.closing(client):
        client.connect(
            username=parsed.username,
            hostname=parsed.hostname,
            port=parsed.port,
            pkey=ssh_key,
        )
        self.assertTrue(client.get_transport().is_active())
        # simple commands can also be executed ( this would be like `ssh bash -c 'pwd'` )
        # exec_command means `ssh user@host command`
        current_path = bytes2str(client.exec_command("pwd")[1].read(1000)).strip()
        self.assertIn(current_path, self.computer_partition_root_path)
