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"""
.. _saltify-module:

Saltify Module
==============

The Saltify module is designed to install Salt on a remote machine, virtual or
bare metal, using SSH. This module is useful for provisioning machines which
are already installed, but not Salted.

.. versionchanged:: 2018.3.0
    The wake_on_lan capability, and actions destroy, reboot, and query functions were added.

Use of this module requires some configuration in cloud profile and provider
files as described in the
:ref:`Getting Started with Saltify <getting-started-with-saltify>` documentation.
"""

import logging
import time

import salt.client
import salt.config as config
import salt.utils.cloud
from salt._compat import ipaddress
from salt.exceptions import SaltCloudException, SaltCloudSystemExit

log = logging.getLogger(__name__)

try:
    # noinspection PyUnresolvedReferences
    from smbprotocol.exceptions import InternalError as smbSessionError

    HAS_SMB = True
except ImportError:
    HAS_SMB = False

try:
    # noinspection PyUnresolvedReferences
    # noinspection PyUnresolvedReferences
    from requests.exceptions import (
        ConnectionError,
        ConnectTimeout,
        InvalidSchema,
        ProxyError,
        ReadTimeout,
        RetryError,
        SSLError,
    )
    from winrm.exceptions import WinRMTransportError

    HAS_WINRM = True
except ImportError:
    HAS_WINRM = False


def __virtual__():
    """
    Needs no special configuration
    """
    return True


def _get_active_provider_name():
    try:
        return __active_provider_name__.value()
    except AttributeError:
        return __active_provider_name__


def avail_locations(call=None):
    """
    This function returns a list of locations available.

    .. code-block:: bash

        salt-cloud --list-locations my-cloud-provider

    [ saltify will always return an empty dictionary ]
    """

    return {}


def avail_images(call=None):
    """
    This function returns a list of images available for this cloud provider.

    .. code-block:: bash

        salt-cloud --list-images saltify

    returns a list of available profiles.

    .. versionadded:: 2018.3.0

    """
    vm_ = get_configured_provider()
    return {"Profiles": [profile for profile in vm_["profiles"]]}


def avail_sizes(call=None):
    """
    This function returns a list of sizes available for this cloud provider.

    .. code-block:: bash

        salt-cloud --list-sizes saltify

    [ saltify always returns an empty dictionary ]
    """
    return {}


def list_nodes(call=None):
    """
    List the nodes which have salt-cloud:driver:saltify grains.

    .. code-block:: bash

        salt-cloud -Q

    returns a list of dictionaries of defined standard fields.

    .. versionadded:: 2018.3.0

    """
    nodes = _list_nodes_full(call)
    return _build_required_items(nodes)


def _build_required_items(nodes):
    ret = {}
    for name, grains in nodes.items():
        if grains:
            private_ips = []
            public_ips = []
            ips = grains["ipv4"] + grains["ipv6"]
            for adrs in ips:
                ip_ = ipaddress.ip_address(adrs)
                if not ip_.is_loopback:
                    if ip_.is_private:
                        private_ips.append(adrs)
                    else:
                        public_ips.append(adrs)

            ret[name] = {
                "id": grains["id"],
                "image": grains["salt-cloud"]["profile"],
                "private_ips": private_ips,
                "public_ips": public_ips,
                "size": "",
                "state": "running",
            }

    return ret


def list_nodes_full(call=None):
    """
    Lists complete information for all nodes.

    .. code-block:: bash

        salt-cloud -F

    returns a list of dictionaries.

    for 'saltify' minions, returns dict of grains (enhanced).

    .. versionadded:: 2018.3.0
    """

    ret = _list_nodes_full(call)

    for (
        key,
        grains,
    ) in ret.items():  # clean up some hyperverbose grains -- everything is too much
        try:
            del (
                grains["cpu_flags"],
                grains["disks"],
                grains["pythonpath"],
                grains["dns"],
                grains["gpus"],
            )
        except KeyError:
            pass  # ignore absence of things we are eliminating
        except TypeError:
            del ret[key]  # eliminate all reference to unexpected (None) values.

    reqs = _build_required_items(ret)

    for name in ret:
        ret[name].update(reqs[name])

    return ret


def _list_nodes_full(call=None):
    """
    List the nodes, ask all 'saltify' minions, return dict of grains.
    """
    with salt.client.LocalClient() as local:
        return local.cmd(
            "salt-cloud:driver:saltify", "grains.items", "", tgt_type="grain"
        )


def list_nodes_select(call=None):
    """
    Return a list of the minions that have salt-cloud grains, with
    select fields.
    """
    return salt.utils.cloud.list_nodes_select(
        list_nodes_full("function"),
        __opts__["query.selection"],
        call,
    )


def show_instance(name, call=None):
    """
    List the a single node, return dict of grains.
    """
    with salt.client.LocalClient() as local:
        ret = local.cmd(name, "grains.items")
        ret.update(_build_required_items(ret))
        return ret


def create(vm_):
    """
    if configuration parameter ``deploy`` is ``True``,

        Provision a single machine, adding its keys to the salt master

    else,

        Test ssh connections to the machine

    Configuration parameters:

    - deploy:  (see above)
    - provider:  name of entry in ``salt/cloud.providers.d/???`` file
    - ssh_host: IP address or DNS name of the new machine
    - ssh_username:  name used to log in to the new machine
    - ssh_password:  password to log in (unless key_filename is used)
    - key_filename:  (optional) SSH private key for passwordless login
    - ssh_port: (default=22) TCP port for SSH connection
    - wake_on_lan_mac:  (optional) hardware (MAC) address for wake on lan
    - wol_sender_node:  (optional) salt minion to send wake on lan command
    - wol_boot_wait:  (default=30) seconds to delay while client boots
    - force_minion_config: (optional) replace the minion configuration files on the new machine

    See also
    :ref:`Miscellaneous Salt Cloud Options <misc-salt-cloud-options>`
    and
    :ref:`Getting Started with Saltify <getting-started-with-saltify>`

    CLI Example:

    .. code-block:: bash

        salt-cloud -p mymachine my_new_id
    """
    deploy_config = config.get_cloud_config_value(
        "deploy", vm_, __opts__, default=False
    )

    # If ssh_host is not set, default to the minion name
    if not config.get_cloud_config_value("ssh_host", vm_, __opts__, default=""):
        vm_["ssh_host"] = vm_["name"]

    if deploy_config:
        wol_mac = config.get_cloud_config_value(
            "wake_on_lan_mac", vm_, __opts__, default=""
        )
        wol_host = config.get_cloud_config_value(
            "wol_sender_node", vm_, __opts__, default=""
        )
        if wol_mac and wol_host:
            good_ping = False
            ssh_host = config.get_cloud_config_value(
                "ssh_host", vm_, __opts__, default=""
            )
            with salt.client.LocalClient() as local:
                if ssh_host:
                    log.info("trying to ping %s", ssh_host)
                    count = "n" if salt.utils.platform.is_windows() else "c"
                    cmd = f"ping -{count} 1 {ssh_host}"
                    good_ping = local.cmd(wol_host, "cmd.retcode", [cmd]) == 0
                if good_ping:
                    log.info("successful ping.")
                else:
                    log.info(
                        "sending wake-on-lan to %s using node %s", wol_mac, wol_host
                    )

                    if isinstance(wol_mac, str):
                        wol_mac = [wol_mac]  # a smart user may have passed more params
                    ret = local.cmd(wol_host, "network.wol", wol_mac)
                    log.info("network.wol returned value %s", ret)
                    if ret and ret[wol_host]:
                        sleep_time = config.get_cloud_config_value(
                            "wol_boot_wait", vm_, __opts__, default=30
                        )
                        if sleep_time > 0.0:
                            log.info("delaying %d seconds for boot", sleep_time)
                            time.sleep(sleep_time)
        log.info("Provisioning existing machine %s", vm_["name"])
        ret = __utils__["cloud.bootstrap"](vm_, __opts__)
    else:
        ret = _verify(vm_)

    return ret


def get_configured_provider():
    """
    Return the first configured instance.
    """
    return config.is_provider_configured(
        __opts__, _get_active_provider_name() or "saltify", ()
    )


def _verify(vm_):
    """
    Verify credentials for an existing system
    """
    log.info("Verifying credentials for %s", vm_["name"])

    win_installer = config.get_cloud_config_value("win_installer", vm_, __opts__)

    if win_installer:

        log.debug("Testing Windows authentication method for %s", vm_["name"])

        if not HAS_SMB:
            log.error("smbprotocol library not found")
            return False

        # Test Windows connection
        kwargs = {
            "host": vm_["ssh_host"],
            "username": config.get_cloud_config_value(
                "win_username", vm_, __opts__, default="Administrator"
            ),
            "password": config.get_cloud_config_value(
                "win_password", vm_, __opts__, default=""
            ),
        }

        # Test SMB connection
        try:
            log.debug("Testing SMB protocol for %s", vm_["name"])
            if __utils__["smb.get_conn"](**kwargs) is False:
                return False
        except smbSessionError as exc:
            log.error("Exception: %s", exc)
            return False

        # Test WinRM connection
        use_winrm = config.get_cloud_config_value(
            "use_winrm", vm_, __opts__, default=False
        )

        if use_winrm:
            log.debug("WinRM protocol requested for %s", vm_["name"])
            if not HAS_WINRM:
                log.error("WinRM library not found")
                return False

            kwargs["port"] = config.get_cloud_config_value(
                "winrm_port", vm_, __opts__, default=5986
            )
            kwargs["timeout"] = 10

            try:
                log.debug("Testing WinRM protocol for %s", vm_["name"])
                return __utils__["cloud.wait_for_winrm"](**kwargs) is not None
            except (
                ConnectionError,
                ConnectTimeout,
                ReadTimeout,
                SSLError,
                ProxyError,
                RetryError,
                InvalidSchema,
                WinRMTransportError,
            ) as exc:
                log.error("Exception: %s", exc)
                return False

        return True

    else:

        log.debug("Testing SSH authentication method for %s", vm_["name"])

        # Test SSH connection
        kwargs = {
            "host": vm_["ssh_host"],
            "port": config.get_cloud_config_value(
                "ssh_port", vm_, __opts__, default=22
            ),
            "username": config.get_cloud_config_value(
                "ssh_username", vm_, __opts__, default="root"
            ),
            "password": config.get_cloud_config_value(
                "password", vm_, __opts__, search_global=False
            ),
            "key_filename": config.get_cloud_config_value(
                "key_filename",
                vm_,
                __opts__,
                search_global=False,
                default=config.get_cloud_config_value(
                    "ssh_keyfile", vm_, __opts__, search_global=False, default=None
                ),
            ),
            "gateway": vm_.get("gateway", None),
            "maxtries": 1,
        }

        log.debug("Testing SSH protocol for %s", vm_["name"])
        try:
            return __utils__["cloud.wait_for_passwd"](**kwargs) is True
        except SaltCloudException as exc:
            log.error("Exception: %s", exc)
            return False


def destroy(name, call=None):
    """Destroy a node.

    .. versionadded:: 2018.3.0

    Disconnect a minion from the master, and remove its keys.

    Optionally, (if ``remove_config_on_destroy`` is ``True``),
      disables salt-minion from running on the minion, and
      erases the Salt configuration files from it.

    Optionally, (if ``shutdown_on_destroy`` is ``True``),
      orders the minion to halt.

    CLI Example:

    .. code-block:: bash

        salt-cloud --destroy mymachine

    """
    if call == "function":
        raise SaltCloudSystemExit(
            "The destroy action must be called with -d, --destroy, -a, or --action."
        )

    opts = __opts__

    __utils__["cloud.fire_event"](
        "event",
        "destroying instance",
        f"salt/cloud/{name}/destroying",
        args={"name": name},
        sock_dir=opts["sock_dir"],
        transport=opts["transport"],
    )

    vm_ = get_configured_provider()
    with salt.client.LocalClient() as local:
        my_info = local.cmd(name, "grains.get", ["salt-cloud"])
        try:
            vm_.update(my_info[name])  # get profile name to get config value
        except (IndexError, TypeError):
            pass
        if config.get_cloud_config_value(
            "remove_config_on_destroy", vm_, opts, default=True
        ):
            ret = local.cmd(
                name,  # prevent generating new keys on restart
                "service.disable",
                ["salt-minion"],
            )
            if ret and ret[name]:
                log.info("disabled salt-minion service on %s", name)
            ret = local.cmd(name, "config.get", ["conf_file"])
            if ret and ret[name]:
                confile = ret[name]
                ret = local.cmd(name, "file.remove", [confile])
                if ret and ret[name]:
                    log.info("removed minion %s configuration file %s", name, confile)
            ret = local.cmd(name, "config.get", ["pki_dir"])
            if ret and ret[name]:
                pki_dir = ret[name]
                ret = local.cmd(name, "file.remove", [pki_dir])
                if ret and ret[name]:
                    log.info("removed minion %s key files in %s", name, pki_dir)

        if config.get_cloud_config_value(
            "shutdown_on_destroy", vm_, opts, default=False
        ):
            ret = local.cmd(name, "system.shutdown")
            if ret and ret[name]:
                log.info("system.shutdown for minion %s successful", name)

    __utils__["cloud.fire_event"](
        "event",
        "destroyed instance",
        f"salt/cloud/{name}/destroyed",
        args={"name": name},
        sock_dir=opts["sock_dir"],
        transport=opts["transport"],
    )

    return {"Destroyed": f"{name} was destroyed."}


def reboot(name, call=None):
    """
    Reboot a saltify minion.

    .. versionadded:: 2018.3.0

    name
        The name of the VM to reboot.

    CLI Example:

    .. code-block:: bash

        salt-cloud -a reboot vm_name
    """

    if call != "action":
        raise SaltCloudException(
            "The reboot action must be called with -a or --action."
        )

    with salt.client.LocalClient() as local:
        return local.cmd(name, "system.reboot")