/usr/share/pyshared/MAT/office.py is in mat 0.4.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 | ''' Care about office's formats
'''
import os
import logging
import zipfile
import fileinput
import tempfile
import shutil
import xml.dom.minidom as minidom
try:
import cairo
from gi.repository import Poppler
except ImportError:
logging.info('office.py loaded without PDF support')
pass
import mat
import parser
import archive
class OpenDocumentStripper(archive.GenericArchiveStripper):
''' An open document file is a zip, with xml file into.
The one that interest us is meta.xml
'''
def get_meta(self):
''' Return a dict with all the meta of the file by
trying to read the meta.xml file.
'''
zipin = zipfile.ZipFile(self.filename, 'r')
metadata = {}
try:
content = zipin.read('meta.xml')
dom1 = minidom.parseString(content)
elements = dom1.getElementsByTagName('office:meta')
for i in elements[0].childNodes:
if i.tagName != 'meta:document-statistic':
nodename = ''.join([k for k in i.nodeName.split(':')[1:]])
metadata[nodename] = ''.join([j.data for j in i.childNodes])
else:
# thank you w3c for not providing a nice
# method to get all attributes of a node
pass
zipin.close()
except KeyError: # no meta.xml file found
logging.debug('%s has no opendocument metadata' % self.filename)
return metadata
def remove_all(self):
'''
FIXME ?
There is a patch implementing the Zipfile.remove()
method here : http://bugs.python.org/issue6818
'''
zipin = zipfile.ZipFile(self.filename, 'r')
zipout = zipfile.ZipFile(self.output, 'w', allowZip64=True)
for item in zipin.namelist():
name = os.path.join(self.tempdir, item)
_, ext = os.path.splitext(name)
if item.endswith('manifest.xml'):
# contain the list of all files present in the archive
zipin.extract(item, self.tempdir)
for line in fileinput.input(name, inplace=1):
# remove the line which contains "meta.xml"
line = line.strip()
if not 'meta.xml' in line:
print line
zipout.write(name, item)
elif ext in parser.NOMETA or item == 'mimetype':
# keep NOMETA files, and the "manifest" file
if item != 'meta.xml': # contains the metadata
zipin.extract(item, self.tempdir)
zipout.write(name, item)
else:
zipin.extract(item, self.tempdir)
if os.path.isfile(name):
try:
cfile = mat.create_class_file(name, False,
add2archive=self.add2archive)
cfile.remove_all()
logging.debug('Processing %s from %s' % (item,
self.filename))
zipout.write(name, item)
except:
logging.info('%s\'s fileformat is not supported' % item)
if self.add2archive:
zipout.write(name, item)
zipout.comment = ''
logging.info('%s processed' % self.filename)
zipin.close()
zipout.close()
self.do_backup()
return True
def is_clean(self):
''' Check if the file is clean from harmful metadatas
'''
zipin = zipfile.ZipFile(self.filename, 'r')
try:
zipin.getinfo('meta.xml')
except KeyError: # no meta.xml in the file
czf = archive.ZipStripper(self.filename, self.parser,
'application/zip', False, True, add2archive=self.add2archive)
if czf.is_clean():
zipin.close()
return True
zipin.close()
return False
class PdfStripper(parser.GenericParser):
''' Represent a PDF file
'''
def __init__(self, filename, parser, mime, backup, is_writable, **kwargs):
super(PdfStripper, self).__init__(filename, parser, mime, backup, is_writable, **kwargs)
uri = 'file://' + os.path.abspath(self.filename)
self.password = None
try:
self.pdf_quality = kwargs['low_pdf_quality']
except KeyError:
self.pdf_quality = False
self.document = Poppler.Document.new_from_file(uri, self.password)
self.meta_list = frozenset(['title', 'author', 'subject', 'keywords', 'creator',
'producer', 'metadata'])
def is_clean(self):
''' Check if the file is clean from harmful metadatas
'''
for key in self.meta_list:
if self.document.get_property(key):
return False
return True
def remove_all(self):
''' Opening the PDF with poppler, then doing a render
on a cairo pdfsurface for each pages.
http://cairographics.org/documentation/pycairo/2/
The use of an intermediate tempfile is necessary because
python-cairo segfaults on unicode.
See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=699457
'''
try:
output = tempfile.mkstemp()[1]
page = self.document.get_page(0)
# assume that every pages are the same size
page_width, page_height = page.get_size()
surface = cairo.PDFSurface(output, page_width, page_height)
context = cairo.Context(surface) # context draws on the surface
logging.debug('PDF rendering of %s' % self.filename)
for pagenum in range(self.document.get_n_pages()):
page = self.document.get_page(pagenum)
context.translate(0, 0)
if self.pdf_quality:
page.render(context) # render the page on context
else:
page.render_for_printing(context) # render the page on context
context.show_page() # draw context on surface
surface.finish()
shutil.move(output, self.output)
except:
logging.error('Something went wrong when cleaning %s. File not cleaned' % self.filename)
return False
try:
import pdfrw # For now, poppler cannot write meta, so we must use pdfrw
logging.debug('Removing %s\'s superficial metadata' % self.filename)
trailer = pdfrw.PdfReader(self.output)
trailer.Info.Producer = None
trailer.Info.Creator = None
writer = pdfrw.PdfWriter()
writer.trailer = trailer
writer.write(self.output)
self.do_backup()
except:
logging.error('Unable to remove all metadata from %s, please install\
pdfrw' % self.output)
return False
return True
def get_meta(self):
''' Return a dict with all the meta of the file
'''
metadata = {}
for key in self.meta_list:
if self.document.get_property(key):
metadata[key] = self.document.get_property(key)
return metadata
class OpenXmlStripper(archive.GenericArchiveStripper):
'''
Represent an office openxml document, which is like
an opendocument format, with some tricky stuff added.
It contains mostly xml, but can have media blobs, crap, ...
(I don't like this format.)
'''
def remove_all(self):
'''
FIXME ?
There is a patch implementing the Zipfile.remove()
method here : http://bugs.python.org/issue6818
'''
zipin = zipfile.ZipFile(self.filename, 'r')
zipout = zipfile.ZipFile(self.output, 'w',
allowZip64=True)
for item in zipin.namelist():
name = os.path.join(self.tempdir, item)
_, ext = os.path.splitext(name)
if item.startswith('docProps/'): # metadatas
pass
elif ext in parser.NOMETA or item == '.rels':
# keep parser.NOMETA files, and the file named ".rels"
zipin.extract(item, self.tempdir)
zipout.write(name, item)
else:
zipin.extract(item, self.tempdir)
if os.path.isfile(name): # don't care about folders
try:
cfile = mat.create_class_file(name, False,
add2archive=self.add2archive)
cfile.remove_all()
logging.debug('Processing %s from %s' % (item,
self.filename))
zipout.write(name, item)
except:
logging.info('%s\'s fileformat is not supported' % item)
if self.add2archive:
zipout.write(name, item)
zipout.comment = ''
logging.info('%s processed' % self.filename)
zipin.close()
zipout.close()
self.do_backup()
return True
def is_clean(self):
''' Check if the file is clean from harmful metadatas
'''
zipin = zipfile.ZipFile(self.filename, 'r')
for item in zipin.namelist():
if item.startswith('docProps/'):
return False
zipin.close()
czf = archive.ZipStripper(self.filename, self.parser,
'application/zip', False, True, add2archive=self.add2archive)
return czf.is_clean()
def get_meta(self):
''' Return a dict with all the meta of the file
'''
zipin = zipfile.ZipFile(self.filename, 'r')
metadata = {}
for item in zipin.namelist():
if item.startswith('docProps/'):
metadata[item] = 'harmful content'
zipin.close()
return metadata
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