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Current File : /usr/lib/python3/dist-packages/uaclient/files/notices.py
import logging
import os
from collections import namedtuple
from enum import Enum
from typing import List

from uaclient import defaults, event_logger, messages, system, util

LOG = logging.getLogger(util.replace_top_level_logger_name(__name__))
event = event_logger.get_event_logger()
NoticeFileDetails = namedtuple(
    "NoticeFileDetails", ["order_id", "label", "is_permanent", "message"]
)


class Notice(NoticeFileDetails, Enum):
    CONTRACT_EXPIRED = NoticeFileDetails(
        label="contract_expired",
        order_id="5",
        is_permanent=True,
        message=messages.CONTRACT_EXPIRED,
    )
    REBOOT_REQUIRED = NoticeFileDetails(
        label="reboot_required",
        order_id="10",
        is_permanent=False,
        message="System reboot required",
    )
    ENABLE_REBOOT_REQUIRED = NoticeFileDetails(
        label="enable_reboot_required",
        order_id="11",
        is_permanent=False,
        message=messages.ENABLE_REBOOT_REQUIRED_TMPL,
    )
    REBOOT_SCRIPT_FAILED = NoticeFileDetails(
        label="reboot_script_failed",
        order_id="12",
        is_permanent=True,
        message=messages.REBOOT_SCRIPT_FAILED,
    )
    FIPS_REBOOT_REQUIRED = NoticeFileDetails(
        label="fips_reboot_required",
        order_id="20",
        is_permanent=False,
        message=messages.FIPS_REBOOT_REQUIRED_MSG,
    )
    FIPS_SYSTEM_REBOOT_REQUIRED = NoticeFileDetails(
        label="fips_system_reboot_required",
        order_id="21",
        is_permanent=False,
        message=messages.FIPS_SYSTEM_REBOOT_REQUIRED,
    )
    FIPS_INSTALL_OUT_OF_DATE = NoticeFileDetails(
        label="fips_install_out_of_date",
        order_id="22",
        is_permanent=True,
        message=messages.FIPS_INSTALL_OUT_OF_DATE,
    )
    FIPS_DISABLE_REBOOT_REQUIRED = NoticeFileDetails(
        label="fips_disable_reboot_required",
        order_id="23",
        is_permanent=False,
        message=messages.FIPS_DISABLE_REBOOT_REQUIRED,
    )
    FIPS_PROC_FILE_ERROR = NoticeFileDetails(
        label="fips_proc_file_error",
        order_id="24",
        is_permanent=True,
        message=messages.FIPS_PROC_FILE_ERROR.tmpl_msg,
    )
    FIPS_MANUAL_DISABLE_URL = NoticeFileDetails(
        label="fips_manual_disable_url",
        order_id="25",
        is_permanent=True,
        message=messages.NOTICE_FIPS_MANUAL_DISABLE_URL,
    )
    WRONG_FIPS_METAPACKAGE_ON_CLOUD = NoticeFileDetails(
        label="wrong_fips_metapackage_on_cloud",
        order_id="25",
        is_permanent=True,
        message=messages.NOTICE_WRONG_FIPS_METAPACKAGE_ON_CLOUD,
    )
    LIVEPATCH_LTS_REBOOT_REQUIRED = NoticeFileDetails(
        label="lp_lts_reboot_required",
        order_id="30",
        is_permanent=False,
        message=messages.LIVEPATCH_LTS_REBOOT_REQUIRED,
    )
    OPERATION_IN_PROGRESS = NoticeFileDetails(
        label="operation_in_progress",
        order_id="60",
        is_permanent=False,
        message="Operation in progress: {operation}",
    )
    AUTO_ATTACH_RETRY_FULL_NOTICE = NoticeFileDetails(
        label="auto_attach_retry_full_notice",
        order_id="70",
        is_permanent=False,
        message=messages.AUTO_ATTACH_RETRY_NOTICE,
    )
    AUTO_ATTACH_RETRY_TOTAL_FAILURE = NoticeFileDetails(
        label="auto_attach_total_failure",
        order_id="71",
        is_permanent=True,
        message=messages.AUTO_ATTACH_RETRY_TOTAL_FAILURE_NOTICE,
    )
    LIMITED_TO_RELEASE = NoticeFileDetails(
        label="limited_to_release",
        order_id="80",
        is_permanent=True,
        message=messages.LIMITED_TO_RELEASE,
    )


class NoticesManager:
    def add(
        self,
        notice_details: Notice,
        description: str,
    ):
        """Adds a notice file. If the notice is found,
        it overwrites it.

        :param notice_details: Holds details concerning the notice file.
        :param description: The content to be written to the notice file.
        """
        if not util.we_are_currently_root():
            LOG.warning(
                "NoticesManager.add(%s) called as non-root user",
                notice_details.value.label,
            )
            return

        directory = (
            defaults.NOTICES_PERMANENT_DIRECTORY
            if notice_details.value.is_permanent
            else defaults.NOTICES_TEMPORARY_DIRECTORY
        )
        filename = "{}-{}".format(
            notice_details.value.order_id, notice_details.value.label
        )
        system.write_file(
            os.path.join(directory, filename),
            description,
        )

    def remove(self, notice_details: Notice):
        """Deletes a notice file.

        :param notice_details: Holds details concerning the notice file.
        """
        if not util.we_are_currently_root():
            LOG.warning(
                "NoticesManager.remove(%s) called as non-root user",
                notice_details.value.label,
            )
            return

        directory = (
            defaults.NOTICES_PERMANENT_DIRECTORY
            if notice_details.value.is_permanent
            else defaults.NOTICES_TEMPORARY_DIRECTORY
        )
        filename = "{}-{}".format(
            notice_details.value.order_id, notice_details.value.label
        )
        system.ensure_file_absent(os.path.join(directory, filename))

    def _get_notice_file_names(self, directory: str) -> List[str]:
        """Gets the list of notice file names in the given directory.

        :param directory: The directory to search for notice files.
        :returns: List of notice file names.
        """
        return [
            file_name
            for file_name in os.listdir(directory)
            if os.path.isfile(os.path.join(directory, file_name))
            and self._is_valid_notice_file(directory, file_name)
        ]

    def _is_valid_notice_file(self, directory: str, file_name: str) -> bool:
        """Checks if the notice file is valid.

        :param file_name: The name of the notice file.
        :returns: True if the file is valid, False otherwise.
        """
        is_permanent_dir = directory == defaults.NOTICES_PERMANENT_DIRECTORY
        valid_file_names = {
            "{}-{}".format(n.order_id, n.label)
            for n in Notice
            if n.is_permanent == is_permanent_dir
        }
        return file_name in valid_file_names

    def _get_default_message(self, file_name: str) -> str:
        """Gets the default message for a notice file.

        :param file_name: The name of the notice file.
        :returns: The default message defined in the enum.
        """
        order_id, label = file_name.split("-")
        for notice in Notice:
            if notice.order_id == order_id and notice.label == label:
                return notice.value.message
        return ""

    def list(self) -> List[str]:
        """Gets all the notice files currently saved.

        :returns: List of notice file contents.
        """
        notice_directories = (
            defaults.NOTICES_PERMANENT_DIRECTORY,
            defaults.NOTICES_TEMPORARY_DIRECTORY,
        )
        notices = []
        for notice_directory in notice_directories:
            if not os.path.exists(notice_directory):
                continue
            notice_file_names = self._get_notice_file_names(notice_directory)
            for notice_file_name in notice_file_names:
                try:
                    notice_file_contents = system.load_file(
                        os.path.join(notice_directory, notice_file_name)
                    )
                except PermissionError:
                    LOG.warning(
                        "Permission error while reading " + notice_file_name
                    )
                    continue
                if notice_file_contents:
                    notices.append(notice_file_contents)
                else:
                    default_message = self._get_default_message(
                        notice_file_name
                    )
                    notices.append(default_message)
        notices.sort()
        return notices


_notice_cls = None


def get_notice():
    global _notice_cls
    if _notice_cls is None:
        _notice_cls = NoticesManager()

    return _notice_cls


def add(notice_details: Notice, **kwargs) -> None:
    notice = get_notice()
    description = notice_details.message.format(**kwargs)
    notice.add(notice_details, description)


def remove(notice_details: Notice) -> None:
    notice = get_notice()
    notice.remove(notice_details)


def list() -> List[str]:
    notice = get_notice()
    return notice.list()

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