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#!/usr/bin/env python
""" Metadata anonymisation toolkit library
"""
import logging
import mimetypes
import os
import platform
import subprocess
import xml.sax
import libmat.exceptions
__version__ = '0.6'
__author__ = 'jvoisin'
# Silence
LOGGING_LEVEL = logging.ERROR
logging.basicConfig(filename='', level=LOGGING_LEVEL)
import strippers # this is loaded here because we need LOGGING_LEVEL
def get_logo(): # pragma: no cover
""" Return the path to the logo
"""
if os.path.isfile(os.path.join(os.path.curdir, 'data/mat.png')):
return os.path.join(os.path.curdir, 'data/mat.png')
elif os.path.isfile('/usr/share/pixmaps/mat.png'):
return '/usr/share/pixmaps/mat.png'
elif os.path.isfile('/usr/local/share/pixmaps/mat.png'):
return '/usr/local/share/pixmaps/mat.png'
def get_datafile_path(filename): # pragma: no cover
""" Return the path to $filename
:param string filename:
"""
paths = ['data', '/usr/local/share/mat/', '/usr/share/mat/']
for path in paths:
filepath = os.path.join(os.path.curdir, path, filename)
if os.path.isfile(filepath):
return filepath
def list_supported_formats(): # pragma: no cover
""" Return a list of all locally supported fileformat.
It parses that FORMATS file, and removes locally
non-supported formats.
"""
handler = XMLParser()
parser = xml.sax.make_parser()
parser.setContentHandler(handler)
path = get_datafile_path('FORMATS')
with open(path, 'r') as xmlfile:
parser.parse(xmlfile)
localy_supported = []
for item in handler.list:
if item['mimetype'].split(',')[0] in strippers.STRIPPERS:
localy_supported.append(item)
return localy_supported
class XMLParser(xml.sax.handler.ContentHandler): # pragma: no cover
""" Parse the supported format xml, and return a corresponding
list of dict
"""
def __init__(self):
xml.sax.handler.ContentHandler.__init__(self)
self.dict = {}
self.list = []
self.content, self.key = '', ''
self.between = False
def startElement(self, name, attrs):
""" Called when entering into xml tag
:param attrs: Attributes of the `nam` xml tag
:param name: Name of the xml tag
"""
self.between = True
self.key = name
self.content = ''
def endElement(self, name):
""" Called when exiting a xml tag
:param name: name of the element
"""
if name == 'format': # leaving a fileformat section
self.list.append(self.dict.copy())
self.dict.clear()
else:
content = self.content.replace('\s', ' ')
self.dict[self.key] = content
self.between = False
def characters(self, characters):
""" Concatenate the content between opening and closing tags
:param characters: content of the tag
"""
if self.between:
self.content += characters
def secure_remove(filename):
""" Securely remove $filename
:param str filename: File to be removed
"""
try: # I want the file removed, even if it's read-only
os.chmod(filename, 220)
except OSError:
logging.error('Unable to add write rights to %s', filename)
raise libmat.exceptions.UnableToWriteFile
try:
shred = 'shred'
if platform.system() == 'MacOS':
shred = 'gshred'
if not subprocess.call([shred, '--remove', filename]):
return True
else:
raise OSError
except OSError:
logging.error('Unable to securely remove %s', filename)
try:
os.remove(filename)
except OSError:
logging.error('Unable to remove %s', filename)
raise libmat.exceptions.UnableToRemoveFile
return True
def create_class_file(name, backup, **kwargs):
""" Return a $FILETYPEStripper() class,
corresponding to the filetype of the given file
:param str name: name of the file to be parsed
:param bool backup: shell the file be backuped?
"""
if not os.path.isfile(name): # check if the file exists
logging.error('%s is not a valid file', name)
return None
elif not os.access(name, os.R_OK): # check read permissions
logging.error('%s is is not readable', name)
return None
mime = mimetypes.guess_type(name)[0]
if not mime:
logging.info('Unable to find mimetype of %s', name)
return None
if mime.startswith('application/vnd.oasis.opendocument'):
mime = 'application/opendocument' # opendocument fileformat
elif mime.startswith('application/vnd.openxmlformats-officedocument'):
mime = 'application/officeopenxml' # office openxml
is_writable = os.access(name, os.W_OK)
try:
stripper_class = strippers.STRIPPERS[mime]
except KeyError:
logging.info('Don\'t have stripper for %s format', mime)
return None
return stripper_class(name, mime, backup, is_writable, **kwargs)
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