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#!/opt/cloudlinux/venv/bin/python3 -Ibb
##
# Copyright (с) Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2022 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# https://www.cloudlinux.com/legal/
##

import os
import pwd
import logging
from enum import Enum
from datetime import datetime, timedelta
from clcommon.cpapi import docroot
from clwpos.wp_utils import wp_get_constant
from xray import gettext as _
from xray.internal.utils import user_context
from secureio import disable_quota

class PluginStatuses(Enum):
    """
    INSTALLED = plugin exists in MU directory

    ERROR = plugin should have been installed: there are advices w/o incompatibility
    and created_at > 2days (wordpress-install cron expected to trigger install)

    NOT_INSTALLED = plugin does not exist in MU directory:
    in ideal world it means whether there are no compatible advices or
    wordpress-plugin install cron has not worked yet

    """
    INSTALLED = 'INSTALLED'
    ERROR = 'ERROR'
    NOT_INSTALLED = 'NOT_INSTALLED'

def create_mu_plugins_dir_if_not_exist(user, mu_plugin_dir):
    """
    Creates MU plugin dir if does not exist yet
    """
    if os.path.isdir(mu_plugin_dir):
        return

    user_data = pwd.getpwnam(user)
    with user_context(user_data.pw_uid, user_data.pw_gid), disable_quota():
        try:
            os.makedirs(mu_plugin_dir)
        except OSError as e:
            logging.error("Failed creating must use plugin folder. Path: %s. Reason: %s",
                          mu_plugin_dir, str(e))

            raise ValueError(_('Unable to create MU plugins directory'))

def get_mu_directory(user, full_wp_path):
    """
    Gets path to directory with MU plugins
    """
    mu_directory = None
    user_data = pwd.getpwnam(user)
    with user_context(user_data.pw_uid, user_data.pw_gid):
        try:
            mu_directory = wp_get_constant(full_wp_path, 'WPMU_PLUGIN_DIR', raise_exception=True)
        except Exception as e:
            logging.error('Unable to read WPMU_PLUGIN_DIR constant, "error=%s"', str(e))

        if not mu_directory:
            try:
                mu_directory = wp_get_constant(full_wp_path, 'WP_CONTENT_DIR', raise_exception=True)
            except Exception as e:
                logging.error('Unable to read WP_CONTENT_DIR constant, "error=%s"', str(e))
    return mu_directory

def is_plugin_installed(user, domain, website):
    """
    Checks whether there is cl-smart-advice.php in MU  plugins directory
    """
    full_website_path = docroot(domain)[0] + website
    mu_directory = get_mu_directory(user, full_website_path)
    if not mu_directory:
        logging.warning('Path to directory with MU plugins was not obtained')
        return None
    plugin_must_use_file = os.path.join(mu_directory, 'cl-smart-advice.php')
    return os.path.islink(plugin_must_use_file)

def should_have_been_installed(advices_for_website, issues):
    """
    1. At least 1 advice has no incompatibilities
    2. The newest advice w/o incompatibilities was created > 2 days ago
    """
    issue_types = []
    if issues:
        issue_types = [issue['advice_type'] for issue in issues]

    return [
        advice
        for advice in advices_for_website
        if is_advice_should_been_synced(advice, issue_types)
    ]

def is_advice_should_been_synced(advice, website_issue_types):
    """
    If advice does not have incompatibility and older than cron time (once a day) ->
    it should have been synced, which triggers plugin installation
    """
    created_at = datetime.fromisoformat(advice['created_at'])
    return advice['advice']['type'] not in website_issue_types and \
            created_at < datetime.now(created_at.tzinfo) - timedelta(days=2)

def get_plugin_status(username, domain, website, issues, current_advices):
    """
    If smart-advice.php in MU plugin dir -> INSTALLED
    If there is at least 1 advice w/o issues and the newest advice is > 2 days -> cron should've work
    and install plugin, most likely error happened -> ERROR
    otherwise: NOT_INSTALLED: all advices are incompatible or wordpress-plugin install cron did not work yet
    """
    if is_plugin_installed(username, domain, website):
        return PluginStatuses.INSTALLED.value
    elif should_have_been_installed(current_advices, issues):
        return PluginStatuses.ERROR.value
    return PluginStatuses.NOT_INSTALLED.value