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"""
This module is the only one that is allowed to be
imported from other tools. Please, keep list of "external"
methods here, so we can keep them backwards-compatible.

The purpose is to reduce number of places in code which randomly
are dependencies of other tools (e.g. x-ray).

Don't user this module in clwpos code.

Maybe one day we will make proper api :)
"""
import json
import logging
import os
import pwd
import subprocess
from typing import List, Optional

from typing_extensions import TypedDict

from clwpos.billing import get_or_create_unique_identifier
from clwpos.cl_wpos_exceptions import WposError
from clwpos.constants import SMART_ADVISE_USER_UTILITY, WPOS_DAEMON_SOCKET_FILE
from clwpos.daemon import WposDaemon
from clwpos.data_collector_utils import php_info as _php_info
from clwpos.feature_suites import PremiumSuite, CDNSuitePro
from clwpos.feature_suites.configurations import get_visible_modules, get_allowed_modules, get_allowed_features_dict
from clwpos.optimization_features import Feature, OBJECT_CACHE_FEATURE, CDN_FEATURE, convert_feature_list_to_interface
from clwpos.user.config import LicenseApproveStatus, UserConfig
from clwpos.utils import (
    is_wpos_supported as _is_wpos_supported,
    daemon_communicate,
    drop_permissions_if_needed,
    get_subscription_status,
    run_in_cagefs_if_needed,
    get_server_wide_options
)


class HostInfo(TypedDict):
    vhost: str
    account: str
    version: str
    handler: str
    documentroot: str


def php_get_vhost_versions(user: str) -> List[HostInfo]:
    """
    Get information about vhosts in the following format:
    [
        {
            'vhost': 'username.zone',
            'account': 'username',
            'version': 'ea-php80',
            'handler': 'php-fpm',
            'documentroot': '/home/username/public_html'
        }
    ]
    """
    return WposDaemon._php_get_vhost_versions(user)


class HostInfoExtended(HostInfo):
    php_binary: str


def php_get_vhost_versions_user() -> List[HostInfoExtended]:
    """
    Get information about vhosts in the following format:
    [
        {
            'vhost': 'username.zone',
            'account': 'username',
            'version': 'ea-php80',
            'php_binary': '/opt/php/php',
            'handler': 'php-fpm',
            'documentroot': '/home/username/public_html'
        }
    ]
    Unlike the php_get_vhost_versions, it automatically detects
    current user and also performs php version change inside the cagefs,
    providing additional information about php binary.
    """
    result = _php_info()
    return [
        HostInfoExtended(
            vhost=php_data['vhost'],
            account=php_data['account'],
            version=php_data['version'].identifier,
            php_binary=php_data['version'].bin,
            handler=php_data['handler'],
            documentroot=php_data['documentroot'],
        ) for php_data in result
    ]


def is_wpos_supported() -> bool:
    """
    Determines whether wpos is supported in current environment
    """
    return _is_wpos_supported()


def is_feature_visible(feature: str, username: str) -> Optional[bool]:
    """
    Determines whether feature is visible for username.
    Return False in case if feature is unknown.
    Return None in case if user is missing.
    """
    try:
        pw = pwd.getpwnam(username)
    except KeyError:
        return None

    return Feature(feature).NAME in (
        item.NAME for item in get_visible_modules(uid=pw.pw_uid)
    )


def is_feature_hidden_server_wide(feature: str):
    return Feature(feature).optimization_feature() in get_server_wide_options().hidden_features


def is_feature_allowed(feature: str, username: str) -> Optional[bool]:
    """
    Determines whether feature is allowed for username to be activated.
    Return False in case if feature is unknown.
    Return None in case if user is missing.
    """
    try:
        pw = pwd.getpwnam(username)
    except KeyError:
        return None

    return Feature(feature).NAME in (
        item.NAME for item in get_allowed_modules(uid=pw.pw_uid)
    )


def is_subscription_pending(feature: str, username: str) -> Optional[bool]:
    """
    Determines whether feature is allowed for username to be activated.
    """
    try:
        pw = pwd.getpwnam(username)
    except KeyError:
        return None

    try:
        is_pending = daemon_communicate({
            "command": WposDaemon.DAEMON_GET_UPGRADE_ATTEMPT_STATUS,
            "feature": feature,
            "uid": pw.pw_uid
        })["pending"]
    except WposError:
        return False

    return is_pending


def get_subscription_upgrade_url(feature: str, username: str) -> Optional[str]:
    """
    Determines whether feature is allowed for username to be activated.
    """
    try:
        pw = pwd.getpwnam(username)
    except KeyError:
        return None

    try:
        upgrade_url = daemon_communicate({
            "command": WposDaemon.DAEMON_GET_UPGRADE_LINK_COMMAND,
            "uid": pw.pw_uid,
            "feature": feature
        })["upgrade_url"]
    except WposError:
        return None

    return upgrade_url

def _get_cdn_usage_statistics(username):
    """Wrapper for easy mocking"""
    with drop_permissions_if_needed(username):
        get_usage_command = [SMART_ADVISE_USER_UTILITY, 'get-cdn-usage']

        output = run_in_cagefs_if_needed(get_usage_command, check=True).stdout
        try:
            return json.loads(output)['data']
        except KeyError:
            raise subprocess.CalledProcessError(
                returncode=0, cmd=get_usage_command,
                output=output)


def get_subscriptions_info(username: str):
    """
    Backwards compatibility for the third party tools.
    Use get_subscriptions_info_2 instead.
    """
    try:
        user_pw = pwd.getpwnam(username)
    except Exception:
        logging.error('Cannot get uid for user: %s, subscription info will be empty', username)
        return {}

    return get_subscriptions_by_pw(user_pw)


def get_subscriptions_by_pw(user_pw: pwd.struct_passwd):
    subscriptions = {}

    allowed_features_dict = get_allowed_features_dict(user_pw.pw_uid)
    converted_allowed_features = {feature_set: convert_feature_list_to_interface(features)
                                  for feature_set, features in allowed_features_dict.items()}

    for feature, suite_name in (
            (OBJECT_CACHE_FEATURE.NAME, PremiumSuite.name),
            (CDN_FEATURE.NAME, CDNSuitePro.name)
    ):
        subscriptions[feature.lower()] = subscription = dict(
            status=get_subscription_status(
                converted_allowed_features, suite_name, feature.lower())
        )

        if feature == CDN_FEATURE.NAME:
            usage = None
            if is_feature_allowed(feature.lower(), user_pw.pw_name):
                try:
                    info = _get_cdn_usage_statistics(user_pw.pw_name)
                except Exception as e:
                    logging.warning("Error during obtaining usage, error: %s", str(e))
                    usage = None
                else:
                    usage = calculate_cdn_usage(info)

            subscription['usage'] = usage

    return subscriptions

def calculate_cdn_usage(info):
    warning = f"Content Delivery Network: You have reached your " \
              f"{info['limit_bytes'] // 1024 ** 3}GB limit. " \
              f"Please upgrade your subscription." \
              f"" if info['total_bytes_used'] >= info['limit_bytes'] else None
    bytes_used = info['total_bytes_used']
    bytes_limit = info['limit_bytes']

    # no usage ---> no warning
    if bytes_used == 0 or bytes_limit == 0:
        warning = None

    usage = {
        "bandwidth": {
            "usage": bytes_used,
            "limit": bytes_limit
        },
        "warning": warning
    }
    return usage


def get_user_auth_key(username: str):
    """
    Reads configuration and gets identifier of user that
    he can use to auth on provisioning server
    """
    return get_or_create_unique_identifier(username)


def get_license_approve_status(feature: str, username: str) -> LicenseApproveStatus:
    """
    Provides easy way for 3rd party tools to get information about license approve status
    """
    with drop_permissions_if_needed(username):
        uc = UserConfig(username)
        feature = Feature(feature)

        return uc.get_license_approve_status(feature)


def approve_license_agreement(feature: str, username: str):
    """
    Provides easy way for 3rd party tools to approve license
    """
    with drop_permissions_if_needed(username):
        uc = UserConfig(username)
        feature = Feature(feature)

        uc.approve_license_agreement(feature)


def get_license_agreement_text(feature: str, username: str):
    """
    Returns text of the license agreement for the given feature or None
    if feature is not required to approve agreement
    """
    with drop_permissions_if_needed(username):
        feature = Feature(feature)

        if not feature.HAS_LICENSE_TERMS:
            return None
        return open(feature.LICENSE_TERMS_PATH).read()


def is_wpos_visible(username: str) -> Optional[bool]:
    """
    Determines whether at least one feature is
    allowed for username to be activated.
    """
    try:
        pw = pwd.getpwnam(username)
    except KeyError:
        return None

    return bool(get_visible_modules(uid=pw.pw_uid))


def is_smart_advice_notifications_disabled_server_wide() -> Optional[bool]:
    """
    Returns whether WordPress SmartAdvice notifications are disabled.
    """
    return get_server_wide_options().disable_smart_advice_notifications


def is_smart_advice_wordpress_plugin_disabled_server_wide() -> Optional[bool]:
    """
    Returns whether WordPress SmartAdvice plugin is disabled on this server.
    """
    return get_server_wide_options().disable_smart_advice_wordpress_plugin


def is_smart_advice_reminders_disabled_server_wide() -> Optional[bool]:
    return get_server_wide_options().disable_smart_advice_reminders

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