# -*- coding: utf-8 -*-
# files.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
Implements file helper methods
"""

import os
import stat
import logging
import time
import errno

logger = logging.getLogger(__name__)


def check_and_fix_urw_only(cert):
    """
    Test for 600 mode and try to set it if anything different found

    Might raise OSError

    @param cert: Certificate path
    @type cert: str
    """
    mode = stat.S_IMODE(os.stat(cert).st_mode)

    if mode != int('600', 8):
        try:
            logger.warning('Bad permission on %s attempting to set 600' %
                           (cert,))
            os.chmod(cert, stat.S_IRUSR | stat.S_IWUSR)
        except OSError:
            logger.error('Error while trying to chmod 600 %s' %
                         cert)
            raise


def get_mtime(filename):
    """
    Returns the modified time or None if the file doesn't exist

    @param filename: path to check
    @type filename: str

    @rtype: str
    """
    try:
        mtime = time.ctime(os.path.getmtime(filename)) + " GMT"
        return mtime
    except OSError:
        return None


def mkdir_p(path):
    """
    Creates the path and all the intermediate directories that don't
    exist

    Might raise OSError

    @param path: path to create
    @type path: str
    """
    try:
        os.makedirs(path)
    except OSError as exc:
        if exc.errno == errno.EEXIST and os.path.isdir(path):
            pass
        else:
            raise