Directory._listdir() - Code Metrics - ergoithz/browsepy - Measure and Improve Code Quality continuously with Scrutinizer

Directory._listdir() B
last analyzed 2017-11-05 10:53 UTC

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loc	23
rs	7.6949
cc	6
#!/usr/bin/env python
# -*- coding: UTF-8 -*-

import os
import os.path
import re
import shutil
import codecs
import string
import random
import datetime
import logging

from flask import current_app, send_from_directory
from werkzeug.utils import cached_property

from . import compat
from .compat import range
from .stream import TarFileStream
from .exceptions import OutsideDirectoryBase, OutsideRemovableBase, \
                        PathTooLongError, FilenameTooLongError


logger = logging.getLogger(__name__)
unicode_underscore = '_'.decode('utf-8') if compat.PY_LEGACY else '_'
underscore_replace = '%s:underscore' % __name__
codecs.register_error(underscore_replace,
                      lambda error: (unicode_underscore, error.start + 1)
                      )
binary_units = ("B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB")
standard_units = ("B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB")
common_path_separators = '\\/'
restricted_chars = '/\0'
nt_restricted_chars = '/\0\\<>:"|?*' + ''.join(map(chr, range(1, 32)))
restricted_names = ('.', '..', '::', '/', '\\')
nt_device_names = (
    ('CON', 'PRN', 'AUX', 'NUL') +
    tuple(map('COM{}'.format, range(1, 10))) +
    tuple(map('LPT{}'.format, range(1, 10)))
    )
fs_safe_characters = string.ascii_uppercase + string.digits


class Node(object):
    '''
    Abstract filesystem node class.

    This represents an unspecified entity with a filesystem's path suitable for
    being inherited by plugins.

    When inheriting, the following attributes should be overwritten in order
    to specify :meth:`from_urlpath` classmethod behavior:

    * :attr:`generic`, if true, an instance of directory_class or file_class
      will be created instead of an instance of this class tself.
    * :attr:`directory_class`, class will be used for directory nodes,
    * :attr:`file_class`, class will be used for file nodes.
    '''
    generic = True
    directory_class = None  # set later at import time
    file_class = None  # set later at import time

    re_charset = re.compile('; charset=(?P<charset>[^;]+)')
    can_download = False
    is_root = False

    @cached_property
    def is_excluded(self):
        '''
        Get if current node shouldn't be shown, using :attt:`app` config's
        exclude_fnc.

        :returns: True if excluded, False otherwise
        '''
        exclude = self.app and self.app.config['exclude_fnc']
        return exclude and exclude(self.path)

    @cached_property
    def plugin_manager(self):
        '''
        Get current app's plugin manager.

        :returns: plugin manager instance
        '''
        return self.app.extensions['plugin_manager']

    @cached_property
    def widgets(self):
        '''
        List widgets with filter return True for this node (or without filter).

        Remove button is prepended if :property:can_remove returns true.

        :returns: list of widgets
        :rtype: list of namedtuple instances
        '''
        widgets = []
        if self.can_remove:
            widgets.append(
                self.plugin_manager.create_widget(
                    'entry-actions',
                    'button',
                    file=self,
                    css='remove',
                    endpoint='remove'
                    )
                )
        return widgets + self.plugin_manager.get_widgets(file=self)

    @cached_property
    def link(self):
        '''
        Get last widget with place "entry-link".

        :returns: widget on entry-link (ideally a link one)
        :rtype: namedtuple instance
        '''
        link = None
        for widget in self.widgets:
            if widget.place == 'entry-link':
                link = widget
        return link

    @cached_property
    def can_remove(self):
        '''
        Get if current node can be removed based on app config's
        directory_remove.

        :returns: True if current node can be removed, False otherwise.
        :rtype: bool
        '''
        dirbase = self.app.config["directory_remove"]
        return bool(dirbase and check_under_base(self.path, dirbase))

    @cached_property
    def stats(self):
        '''
        Get current stats object as returned by os.stat function.

        :returns: stats object
        :rtype: posix.stat_result or nt.stat_result
        '''
        return os.stat(self.path)

    @cached_property
    def pathconf(self):
        '''
        Get filesystem config for current path.
        See :func:`compat.pathconf`.

        :returns: fs config
        :rtype: dict
        '''
        return compat.pathconf(self.path)

    @cached_property
    def parent(self):
        '''
        Get parent node if available based on app config's directory_base.

        :returns: parent object if available
        :rtype: Node instance or None
        '''
        if check_path(self.path, self.app.config['directory_base']):
            return None
        parent = os.path.dirname(self.path) if self.path else None
        return self.directory_class(parent, self.app) if parent else None

    @cached_property
    def ancestors(self):
        '''
        Get list of ancestors until app config's directory_base is reached.

        :returns: list of ancestors starting from nearest.
        :rtype: list of Node objects
        '''
        ancestors = []
        parent = self.parent
        while parent:
            ancestors.append(parent)
            parent = parent.parent
        return ancestors

    @property
    def modified(self):
        '''
        Get human-readable last modification date-time.

        :returns: iso9008-like date-time string (without timezone)
        :rtype: str
        '''
        try:
            dt = datetime.datetime.fromtimestamp(self.stats.st_mtime)
            return dt.strftime('%Y.%m.%d %H:%M:%S')
        except OSError:
            return None

    @property
    def urlpath(self):
        '''
        Get the url substring corresponding to this node for those endpoints
        accepting a 'path' parameter, suitable for :meth:`from_urlpath`.

        :returns: relative-url-like for node's path
        :rtype: str
        '''
        return abspath_to_urlpath(self.path, self.app.config['directory_base'])

    @property
    def name(self):
        '''
        Get the basename portion of node's path.

        :returns: filename
        :rtype: str
        '''
        return os.path.basename(self.path)

    @property
    def type(self):
        '''
        Get the mime portion of node's mimetype (without the encoding part).

        :returns: mimetype
        :rtype: str
        '''
        return self.mimetype.split(";", 1)[0]

    @property
    def category(self):
        '''
        Get mimetype category (first portion of mimetype before the slash).

        :returns: mimetype category
        :rtype: str

        As of 2016-11-03's revision of RFC2046 it could be one of the
        following:
            * application
            * audio
            * example
            * image
            * message
            * model
            * multipart
            * text
            * video
        '''
        return self.type.split('/', 1)[0]

    def __init__(self, path=None, app=None, **defaults):
        '''
        :param path: local path
        :type path: str
        :param path: optional app instance
        :type path: flask.app
        :param **defaults: attributes will be set to object
        '''
        self.path = compat.fsdecode(path) if path else None
        self.app = current_app if app is None else app
        self.__dict__.update(defaults)  # only for attr and cached_property

    def remove(self):
        '''
        Does nothing except raising if can_remove property returns False.

        :raises: OutsideRemovableBase if :property:`can_remove` returns false
        '''
        if not self.can_remove:
            raise OutsideRemovableBase("File outside removable base")

    @classmethod
    def from_urlpath(cls, path, app=None):
        '''
        Alternative constructor which accepts a path as taken from URL and uses
        the given app or the current app config to get the real path.

        If class has attribute `generic` set to True, `directory_class` or
        `file_class` will be used as type.

        :param path: relative path as from URL
        :param app: optional, flask application
        :return: file object pointing to path
        :rtype: File
        '''
        app = app or current_app
        base = app.config['directory_base']
        path = urlpath_to_abspath(path, base)
        if not cls.generic:
            kls = cls
        elif os.path.isdir(path):
            kls = cls.directory_class
        else:
            kls = cls.file_class
        return kls(path=path, app=app)

    @classmethod
    def register_file_class(cls, kls):
        '''
        Convenience method for setting current class file_class property.

        :param kls: class to set
        :type kls: type
        :returns: given class (enabling using this as decorator)
        :rtype: type
        '''
        cls.file_class = kls
        return kls

    @classmethod
    def register_directory_class(cls, kls):
        '''
        Convenience method for setting current class directory_class property.

        :param kls: class to set
        :type kls: type
        :returns: given class (enabling using this as decorator)
        :rtype: type
        '''
        cls.directory_class = kls
        return kls


@Node.register_file_class
class File(Node):
    '''
    Filesystem file class.

    Some notes:

    * :attr:`can_download` is fixed to True, so Files can be downloaded
      inconditionaly.
    * :attr:`can_upload` is fixed to False, so nothing can be uploaded to
      file path.
    * :attr:`is_directory` is fixed to False, so no further checks are
      performed.
    * :attr:`generic` is set to False, so static method :meth:`from_urlpath`
      will always return instances of this class.
    '''
    can_download = True
    can_upload = False
    is_directory = False
    generic = False

    @cached_property
    def widgets(self):
        '''
        List widgets with filter return True for this file (or without filter).

        Entry link is prepended.
        Download button is prepended if :property:can_download returns true.
        Remove button is prepended if :property:can_remove returns true.

        :returns: list of widgets
        :rtype: list of namedtuple instances
        '''
        widgets = [
            self.plugin_manager.create_widget(
                'entry-link',
                'link',
                file=self,
                endpoint='open'
                )
            ]
        if self.can_download:
            widgets.append(
                self.plugin_manager.create_widget(
                    'entry-actions',
                    'button',
                    file=self,
                    css='download',
                    endpoint='download_file'
                    )
                )
        return widgets + super(File, self).widgets

    @cached_property
    def mimetype(self):
        '''
        Get full mimetype, with encoding if available.

        :returns: mimetype
        :rtype: str
        '''
        return self.plugin_manager.get_mimetype(self.path)

    @cached_property
    def is_file(self):
        '''
        Get if node is file.

        :returns: True if file, False otherwise
        :rtype: bool
        '''
        return os.path.isfile(self.path)

    @property
    def size(self):
        '''
        Get human-readable node size in bytes.
        If directory, this will corresponds with own inode size.

        :returns: fuzzy size with unit
        :rtype: str
        '''
        try:
            size, unit = fmt_size(
                self.stats.st_size,
                self.app.config['use_binary_multiples'] if self.app else False
                )
        except OSError:
            return None
        if unit == binary_units[0]:
            return "%d %s" % (size, unit)
        return "%.2f %s" % (size, unit)

    @property
    def encoding(self):
        '''
        Get encoding part of mimetype, or "default" if not available.

        :returns: file conding as returned by mimetype function or "default"
        :rtype: str
        '''
        if ";" in self.mimetype:
            match = self.re_charset.search(self.mimetype)
            gdict = match.groupdict() if match else {}
            return gdict.get("charset") or "default"
        return "default"

    def remove(self):
        '''
        Remove file.
        :raises OutsideRemovableBase: when not under removable base directory
        '''
        super(File, self).remove()
        os.unlink(self.path)

    def download(self):
        '''
        Get a Flask's send_file Response object pointing to this file.

        :returns: Response object as returned by flask's send_file
        :rtype: flask.Response
        '''
        directory, name = os.path.split(self.path)
        return send_from_directory(directory, name, as_attachment=True)


@Node.register_directory_class
class Directory(Node):
    '''
    Filesystem directory class.

    Some notes:

    * :attr:`mimetype` is fixed to 'inode/directory', so mimetype detection
      functions won't be called in this case.
    * :attr:`is_file` is fixed to False, so no further checks are needed.
    * :attr:`size` is fixed to 0 (zero), so stats are not required for this.
    * :attr:`encoding` is fixed to 'default'.
    * :attr:`generic` is set to False, so static method :meth:`from_urlpath`
      will always return instances of this class.
    '''
    _listdir_cache = None
    mimetype = 'inode/directory'
    is_file = False
    size = None
    encoding = 'default'
    generic = False

    @property
    def name(self):
        '''
        Get the basename portion of directory's path.

        :returns: filename
        :rtype: str
        '''
        return super(Directory, self).name or self.path

    @cached_property
    def widgets(self):
        '''
        List widgets with filter return True for this dir (or without filter).

        Entry link is prepended.
        Upload scripts and widget are added if :property:can_upload is true.
        Download button is prepended if :property:can_download returns true.
        Remove button is prepended if :property:can_remove returns true.

        :returns: list of widgets
        :rtype: list of namedtuple instances
        '''
        widgets = [
            self.plugin_manager.create_widget(
                'entry-link',
                'link',
                file=self,
                endpoint='browse'
                )
            ]
        if self.can_upload:
            widgets.extend((
                self.plugin_manager.create_widget(
                    'head',
                    'script',
                    file=self,
                    endpoint='static',
                    filename='browse.directory.head.js'
                ),
                self.plugin_manager.create_widget(
                    'scripts',
                    'script',
                    file=self,
                    endpoint='static',
                    filename='browse.directory.body.js'
                ),
                self.plugin_manager.create_widget(
                    'header',
                    'upload',
                    file=self,
                    text='Upload',
                    endpoint='upload'
                    )
                ))
        if self.can_download:
            widgets.append(
                self.plugin_manager.create_widget(
                    'entry-actions',
                    'button',
                    file=self,
                    css='download',
                    endpoint='download_directory'
                    )
                )
        return widgets + super(Directory, self).widgets

    @cached_property
    def is_directory(self):
        '''
        Get if path points to a real directory.

        :returns: True if real directory, False otherwise
        :rtype: bool
        '''
        return os.path.isdir(self.path)

    @cached_property
    def is_root(self):
        '''
        Get if directory is filesystem's root

        :returns: True if FS root, False otherwise
        :rtype: bool
        '''
        return check_path(os.path.dirname(self.path), self.path)

    @cached_property
    def can_download(self):
        '''
        Get if path is downloadable (if app's `directory_downloadable` config
        property is True).

        :returns: True if downloadable, False otherwise
        :rtype: bool
        '''
        return self.app.config['directory_downloadable']

    @cached_property
    def can_upload(self):
        '''
        Get if a file can be uploaded to path (if directory path is under app's
        `directory_upload` config property).

        :returns: True if a file can be upload to directory, False otherwise
        :rtype: bool
        '''
        dirbase = self.app.config["directory_upload"]
        return dirbase and check_base(self.path, dirbase)

    @cached_property
    def can_remove(self):
        '''
        Get if current node can be removed based on app config's
        directory_remove.

        :returns: True if current node can be removed, False otherwise.
        :rtype: bool
        '''
        return self.parent and super(Directory, self).can_remove

    @cached_property
    def is_empty(self):
        '''
        Get if directory is empty (based on :meth:`_listdir`).

        :returns: True if this directory has no entries, False otherwise.
        :rtype: bool
        '''
        if self._listdir_cache is not None:
            return not bool(self._listdir_cache)
        for entry in self._listdir():
            return False
        return True

    def remove(self):
        '''
        Remove directory tree.

        :raises OutsideRemovableBase: when not under removable base directory
        '''
        super(Directory, self).remove()
        shutil.rmtree(self.path)

    def download(self):
        '''
        Get a Flask Response object streaming a tarball of this directory.

        :returns: Response object
        :rtype: flask.Response
        '''
        return self.app.response_class(
            TarFileStream(
                self.path,
                self.app.config['directory_tar_buffsize'],
                self.app.config['exclude_fnc'],
                ),
            mimetype="application/octet-stream"
            )

    def contains(self, filename):
        '''
        Check if directory contains an entry with given filename.

        :param filename: filename will be check
        :type filename: str
        :returns: True if exists, False otherwise.
        :rtype: bool
        '''
        return os.path.exists(os.path.join(self.path, filename))

    def choose_filename(self, filename, attempts=999):
        '''
        Get a new filename which does not colide with any entry on directory,
        based on given filename.

        :param filename: base filename
        :type filename: str
        :param attempts: number of attempts, defaults to 999
        :type attempts: int
        :returns: filename
        :rtype: str

        :raises FilenameTooLong: when filesystem filename size limit is reached
        :raises PathTooLong: when OS or filesystem path size limit is reached
        '''
        new_filename = filename
        for attempt in range(2, attempts + 1):
            if not self.contains(new_filename):
                break
            new_filename = alternative_filename(filename, attempt)
        else:
            while self.contains(new_filename):
                new_filename = alternative_filename(filename)

        limit = self.pathconf.get('PC_NAME_MAX', 0)
        if limit and limit < len(filename):
            raise FilenameTooLongError(
                path=self.path, filename=filename, limit=limit)

        abspath = os.path.join(self.path, filename)
        limit = self.pathconf.get('PC_PATH_MAX', 0)
        if limit and limit < len(abspath):
            raise PathTooLongError(path=abspath, limit=limit)

        return new_filename

    def _listdir(self, precomputed_stats=(os.name == 'nt')):
        '''
        Iter unsorted entries on this directory.

        :yields: Directory or File instance for each entry in directory
        :ytype: Node
        '''
        for entry in scandir(self.path, self.app):
            kwargs = {
                'path': entry.path,
                'app': self.app,
                'parent': self,
                'is_excluded': False
                }
            try:
                if precomputed_stats and not entry.is_symlink():
                    kwargs['stats'] = entry.stat()
                if entry.is_dir(follow_symlinks=True):
                    yield self.directory_class(**kwargs)
                else:
                    yield self.file_class(**kwargs)
            except OSError as e:
                logger.exception(e)

    def listdir(self, sortkey=None, reverse=False):
        '''
        Get sorted list (by given sortkey and reverse params) of File objects.

        :return: sorted list of File instances
        :rtype: list of File instances
        '''
        if self._listdir_cache is None:
            self._listdir_cache = tuple(self._listdir())
        if sortkey:
            return sorted(self._listdir_cache, key=sortkey, reverse=reverse)
        data = list(self._listdir_cache)
        if reverse:
            data.reverse()
        return data


def fmt_size(size, binary=True):
    '''
    Get size and unit.

    :param size: size in bytes
    :type size: int
    :param binary: whether use binary or standard units, defaults to True
    :type binary: bool
    :return: size and unit
    :rtype: tuple of int and unit as str
    '''
    if binary:
        fmt_sizes = binary_units
        fmt_divider = 1024.
    else:
        fmt_sizes = standard_units
        fmt_divider = 1000.
    for fmt in fmt_sizes[:-1]:
        if size < 1000:
            return (size, fmt)
        size /= fmt_divider
    return size, fmt_sizes[-1]


def relativize_path(path, base, os_sep=os.sep):
    '''
    Make absolute path relative to an absolute base.

    :param path: absolute path
    :type path: str
    :param base: absolute base path
    :type base: str
    :param os_sep: path component separator, defaults to current OS separator
    :type os_sep: str
    :return: relative path
    :rtype: str or unicode
    :raises OutsideDirectoryBase: if path is not below base
    '''
    if not check_base(path, base, os_sep):
        raise OutsideDirectoryBase("%r is not under %r" % (path, base))
    prefix_len = len(base)
    if not base.endswith(os_sep):
        prefix_len += len(os_sep)
    return path[prefix_len:]


def abspath_to_urlpath(path, base, os_sep=os.sep):
    '''
    Make filesystem absolute path uri relative using given absolute base path.

    :param path: absolute path
    :param base: absolute base path
    :param os_sep: path component separator, defaults to current OS separator
    :return: relative uri
    :rtype: str or unicode
    :raises OutsideDirectoryBase: if resulting path is not below base
    '''
    return relativize_path(path, base, os_sep).replace(os_sep, '/')


def urlpath_to_abspath(path, base, os_sep=os.sep):
    '''
    Make uri relative path fs absolute using a given absolute base path.

    :param path: relative path
    :param base: absolute base path
    :param os_sep: path component separator, defaults to current OS separator
    :return: absolute path
    :rtype: str or unicode
    :raises OutsideDirectoryBase: if resulting path is not below base
    '''
    prefix = base if base.endswith(os_sep) else base + os_sep
    realpath = os.path.abspath(prefix + path.replace('/', os_sep))
    if check_path(base, realpath) or check_under_base(realpath, base):
        return realpath
    raise OutsideDirectoryBase("%r is not under %r" % (realpath, base))


def generic_filename(path):
    '''
    Extract filename of given path os-indepently, taking care of known path
    separators.

    :param path: path
    :return: filename
    :rtype: str or unicode (depending on given path)
    '''

    for sep in common_path_separators:
        if sep in path:
            _, path = path.rsplit(sep, 1)
    return path


def clean_restricted_chars(path, restricted_chars=restricted_chars):
    '''
    Get path without restricted characters.

    :param path: path
    :return: path without restricted characters
    :rtype: str or unicode (depending on given path)
    '''
    for character in restricted_chars:
        path = path.replace(character, '_')
    return path


def check_forbidden_filename(filename,
                             destiny_os=os.name,
                             restricted_names=restricted_names):
    '''
    Get if given filename is forbidden for current OS or filesystem.

    :param filename:
    :param destiny_os: destination operative system
    :param fs_encoding: destination filesystem filename encoding
    :return: wether is forbidden on given OS (or filesystem) or not
    :rtype: bool
    '''
    return (
      filename in restricted_names or
      destiny_os == 'nt' and
      filename.split('.', 1)[0].upper() in nt_device_names
      )


def check_path(path, base, os_sep=os.sep):
    '''
    Check if both given paths are equal.

    :param path: absolute path
    :type path: str
    :param base: absolute base path
    :type base: str
    :param os_sep: path separator, defaults to os.sep
    :type base: str
    :return: wether two path are equal or not
    :rtype: bool
    '''
    base = base[:-len(os_sep)] if base.endswith(os_sep) else base
    return os.path.normcase(path) == os.path.normcase(base)


def check_base(path, base, os_sep=os.sep):
    '''
    Check if given absolute path is under or given base.

    :param path: absolute path
    :type path: str
    :param base: absolute base path
    :type base: str
    :param os_sep: path separator, defaults to os.sep
    :return: wether path is under given base or not
    :rtype: bool
    '''
    return (
        check_path(path, base, os_sep) or
        check_under_base(path, base, os_sep)
        )


def check_under_base(path, base, os_sep=os.sep):
    '''
    Check if given absolute path is under given base.

    :param path: absolute path
    :type path: str
    :param base: absolute base path
    :type base: str
    :param os_sep: path separator, defaults to os.sep
    :return: wether file is under given base or not
    :rtype: bool
    '''
    prefix = base if base.endswith(os_sep) else base + os_sep
    return os.path.normcase(path).startswith(os.path.normcase(prefix))


def secure_filename(path, destiny_os=os.name, fs_encoding=compat.FS_ENCODING):
    '''
    Get rid of parent path components and special filenames.

    If path is invalid or protected, return empty string.

    :param path: unsafe path, only basename will be used
    :type: str
    :param destiny_os: destination operative system (defaults to os.name)
    :type destiny_os: str
    :param fs_encoding: fs path encoding (defaults to detected)
    :type fs_encoding: str
    :return: filename or empty string
    :rtype: str
    '''
    path = generic_filename(path)
    path = clean_restricted_chars(
        path,
        restricted_chars=(
            nt_restricted_chars
            if destiny_os == 'nt' else
            restricted_chars
            ))
    path = path.strip(' .')  # required by nt, recommended for others

    if check_forbidden_filename(path, destiny_os=destiny_os):
        return ''

    if isinstance(path, bytes):
        path = path.decode('latin-1', errors=underscore_replace)

    # Decode and recover from filesystem encoding in order to strip unwanted
    # characters out
    kwargs = {
        'os_name': destiny_os,
        'fs_encoding': fs_encoding,
        'errors': underscore_replace,
        }
    fs_encoded_path = compat.fsencode(path, **kwargs)
    fs_decoded_path = compat.fsdecode(fs_encoded_path, **kwargs)
    return fs_decoded_path


def alternative_filename(filename, attempt=None):
    '''
    Generates an alternative version of given filename.

    If an number attempt parameter is given, will be used on the alternative
    name, a random value will be used otherwise.

    :param filename: original filename
    :param attempt: optional attempt number, defaults to null
    :return: new filename
    :rtype: str or unicode
    '''
    filename_parts = filename.rsplit(u'.', 2)
    name = filename_parts[0]
    ext = ''.join(u'.%s' % ext for ext in filename_parts[1:])
    if attempt is None:
        choose = random.choice
        extra = u' %s' % ''.join(choose(fs_safe_characters) for i in range(8))
    else:
        extra = u' (%d)' % attempt
    return u'%s%s%s' % (name, extra, ext)


def scandir(path, app=None):
    '''
    Config-aware scandir. Currently, only aware of ``exclude_fnc``.

    :param path: absolute path
    :type path: str
    :param app: flask application
    :type app: flask.Flask or None
    :returns: filtered scandir entries
    :rtype: iterator
    '''
    exclude = app and app.config.get('exclude_fnc')
    if exclude:
        return (
            item
            for item in compat.scandir(path)
            if not exclude(item.path)
            )
    return compat.scandir(path)

ergoithz / browsepy

Directory._listdir() B last analyzed 2017-11-05 10:53 UTC

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Directory._listdir() B
last analyzed 2017-11-05 10:53 UTC
