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"""
Novell ASAM Runner
==================

.. versionadded:: 2015.8.0

Runner to interact with Novell ASAM Fan-Out Driver

:codeauthor: Nitin Madhok <nmadhok@g.clemson.edu>

To use this runner, set up the Novell Fan-Out Driver URL, username and password in the
master configuration at ``/etc/salt/master`` or ``/etc/salt/master.d/asam.conf``:

.. code-block:: yaml

    asam:
      prov1.domain.com
        username: "testuser"
        password: "verybadpass"
        verify_ssl: true
      prov2.domain.com
        username: "testuser"
        password: "verybadpass"
        verify_ssl: true

.. note::

    Optionally, ``protocol`` and ``port`` can be specified if the Fan-Out Driver server
    is not using the defaults. Default is ``protocol: https`` and ``port: 3451``.

"""

import logging

HAS_LIBS = False
try:
    import html.parser

    import requests

    HAS_LIBS = True

    # pylint: disable=abstract-method

    class ASAMHTMLParser(html.parser.HTMLParser):  # fix issue #30477
        def __init__(self):
            html.parser.HTMLParser.__init__(self)
            self.data = []

        def handle_starttag(self, tag, attrs):
            if tag != "a":
                return
            for attr in attrs:
                if attr[0] != "href":
                    return
                self.data.append(attr[1])

    # pylint: enable=abstract-method


except ImportError:
    pass

log = logging.getLogger(__name__)


def __virtual__():
    """
    Check for ASAM Fan-Out driver configuration in master config file
    or directory and load runner only if it is specified
    """
    if not HAS_LIBS:
        return False

    if _get_asam_configuration() is False:
        return False
    return True


def _get_asam_configuration(driver_url=""):
    """
    Return the configuration read from the master configuration
    file or directory
    """
    asam_config = __opts__["asam"] if "asam" in __opts__ else None

    if asam_config:
        try:
            for asam_server, service_config in asam_config.items():
                username = service_config.get("username", None)
                password = service_config.get("password", None)
                protocol = service_config.get("protocol", "https")
                port = service_config.get("port", 3451)
                verify_ssl = service_config.get("verify_ssl")

                if verify_ssl is None:
                    verify_ssl = True

                if not username or not password:
                    log.error(
                        "Username or Password has not been specified in the "
                        "master configuration for %s",
                        asam_server,
                    )
                    return False

                ret = {
                    "platform_edit_url": "{}://{}:{}/config/PlatformEdit.html".format(
                        protocol, asam_server, port
                    ),
                    "platform_config_url": (
                        "{}://{}:{}/config/PlatformConfig.html".format(
                            protocol, asam_server, port
                        )
                    ),
                    "platformset_edit_url": (
                        "{}://{}:{}/config/PlatformSetEdit.html".format(
                            protocol, asam_server, port
                        )
                    ),
                    "platformset_config_url": (
                        "{}://{}:{}/config/PlatformSetConfig.html".format(
                            protocol, asam_server, port
                        )
                    ),
                    "username": username,
                    "password": password,
                    "verify_ssl": verify_ssl,
                }

                if (not driver_url) or (driver_url == asam_server):
                    return ret
        except Exception as exc:  # pylint: disable=broad-except
            log.error("Exception encountered: %s", exc)
            return False

        if driver_url:
            log.error(
                "Configuration for %s has not been specified in the master "
                "configuration",
                driver_url,
            )
            return False

    return False


def _make_post_request(url, data, auth, verify=True):
    r = requests.post(url, data=data, auth=auth, verify=verify, timeout=120)
    if r.status_code != requests.codes.ok:
        r.raise_for_status()
    else:
        return r.text.split("\n")


def _parse_html_content(html_content):
    parser = ASAMHTMLParser()
    for line in html_content:
        if line.startswith("<META"):
            html_content.remove(line)
        else:
            parser.feed(line)

    return parser


def _get_platformset_name(data, platform_name):
    for item in data:
        if platform_name in item and item.startswith("PlatformEdit.html?"):
            parameter_list = item.split("&")
            for parameter in parameter_list:
                if parameter.startswith("platformSetName"):
                    return parameter.split("=")[1]

    return None


def _get_platforms(data):
    platform_list = []
    for item in data:
        if item.startswith("PlatformEdit.html?"):
            parameter_list = item.split("PlatformEdit.html?", 1)[1].split("&")
            for parameter in parameter_list:
                if parameter.startswith("platformName"):
                    platform_list.append(parameter.split("=")[1])

    return platform_list


def _get_platform_sets(data):
    platform_set_list = []
    for item in data:
        if item.startswith("PlatformSetEdit.html?"):
            parameter_list = item.split("PlatformSetEdit.html?", 1)[1].split("&")
            for parameter in parameter_list:
                if parameter.startswith("platformSetName"):
                    platform_set_list.append(
                        parameter.split("=")[1].replace("%20", " ")
                    )

    return platform_set_list


def remove_platform(name, server_url):
    """
    To remove specified ASAM platform from the Novell Fan-Out Driver

    CLI Example:

    .. code-block:: bash

        salt-run asam.remove_platform my-test-vm prov1.domain.com
    """
    config = _get_asam_configuration(server_url)
    if not config:
        return False

    url = config["platform_config_url"]

    data = {
        "manual": "false",
    }

    auth = (config["username"], config["password"])

    try:
        html_content = _make_post_request(url, data, auth, verify=config["verify_ssl"])
    except Exception as exc:  # pylint: disable=broad-except
        err_msg = f"Failed to look up existing platforms on {server_url}"
        log.error("%s:\n%s", err_msg, exc)
        return {name: err_msg}

    parser = _parse_html_content(html_content)
    platformset_name = _get_platformset_name(parser.data, name)

    if platformset_name:
        log.debug(platformset_name)
        data["platformName"] = name
        data["platformSetName"] = str(platformset_name)
        data["postType"] = "platformRemove"
        data["Submit"] = "Yes"
        try:
            html_content = _make_post_request(
                url, data, auth, verify=config["verify_ssl"]
            )
        except Exception as exc:  # pylint: disable=broad-except
            err_msg = f"Failed to delete platform from {server_url}"
            log.error("%s:\n%s", err_msg, exc)
            return {name: err_msg}

        parser = _parse_html_content(html_content)
        platformset_name = _get_platformset_name(parser.data, name)
        if platformset_name:
            return {name: f"Failed to delete platform from {server_url}"}
        else:
            return {name: f"Successfully deleted platform from {server_url}"}
    else:
        return {name: f"Specified platform name does not exist on {server_url}"}


def list_platforms(server_url):
    """
    To list all ASAM platforms present on the Novell Fan-Out Driver

    CLI Example:

    .. code-block:: bash

        salt-run asam.list_platforms prov1.domain.com
    """
    config = _get_asam_configuration(server_url)
    if not config:
        return False

    url = config["platform_config_url"]

    data = {
        "manual": "false",
    }

    auth = (config["username"], config["password"])

    try:
        html_content = _make_post_request(url, data, auth, verify=config["verify_ssl"])
    except Exception as exc:  # pylint: disable=broad-except
        err_msg = "Failed to look up existing platforms"
        log.error("%s:\n%s", err_msg, exc)
        return {server_url: err_msg}

    parser = _parse_html_content(html_content)
    platform_list = _get_platforms(parser.data)

    if platform_list:
        return {server_url: platform_list}
    else:
        return {server_url: "No existing platforms found"}


def list_platform_sets(server_url):
    """
    To list all ASAM platform sets present on the Novell Fan-Out Driver

    CLI Example:

    .. code-block:: bash

        salt-run asam.list_platform_sets prov1.domain.com
    """
    config = _get_asam_configuration(server_url)
    if not config:
        return False

    url = config["platformset_config_url"]

    data = {
        "manual": "false",
    }

    auth = (config["username"], config["password"])

    try:
        html_content = _make_post_request(url, data, auth, verify=config["verify_ssl"])
    except Exception as exc:  # pylint: disable=broad-except
        err_msg = "Failed to look up existing platform sets"
        log.error("%s:\n%s", err_msg, exc)
        return {server_url: err_msg}

    parser = _parse_html_content(html_content)
    platform_set_list = _get_platform_sets(parser.data)

    if platform_set_list:
        return {server_url: platform_set_list}
    else:
        return {server_url: "No existing platform sets found"}


def add_platform(name, platform_set, server_url):
    """
    To add an ASAM platform using the specified ASAM platform set on the Novell
    Fan-Out Driver

    CLI Example:

    .. code-block:: bash

        salt-run asam.add_platform my-test-vm test-platform-set prov1.domain.com
    """
    config = _get_asam_configuration(server_url)
    if not config:
        return False

    platforms = list_platforms(server_url)
    if name in platforms[server_url]:
        return {name: f"Specified platform already exists on {server_url}"}

    platform_sets = list_platform_sets(server_url)
    if platform_set not in platform_sets[server_url]:
        return {name: f"Specified platform set does not exist on {server_url}"}

    url = config["platform_edit_url"]

    data = {
        "platformName": name,
        "platformSetName": platform_set,
        "manual": "false",
        "previousURL": "/config/platformAdd.html",
        "postType": "PlatformAdd",
        "Submit": "Apply",
    }

    auth = (config["username"], config["password"])

    try:
        html_content = _make_post_request(url, data, auth, verify=config["verify_ssl"])
    except Exception as exc:  # pylint: disable=broad-except
        err_msg = f"Failed to add platform on {server_url}"
        log.error("%s:\n%s", err_msg, exc)
        return {name: err_msg}

    platforms = list_platforms(server_url)
    if name in platforms[server_url]:
        return {name: f"Successfully added platform on {server_url}"}
    else:
        return {name: f"Failed to add platform on {server_url}"}