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'''
Care about office's formats
'''
import os
import logging
import zipfile
import re
import fileinput
from xml.etree import ElementTree
try:
import cairo
import poppler
except ImportError:
pass
import mat
import parser
import archive
import pdfrw
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
'''
zipin = zipfile.ZipFile(self.filename, 'r')
metadata = {}
try:
content = zipin.read('meta.xml')
zipin.close()
tree = ElementTree.fromstring(content)
for node in tree.iter():
key = re.sub('{.*}', '', node.tag)
metadata[key] = node.text
except KeyError: # no meta.xml file found
logging.debug('%s has no opendocument metadata' % self.filename)
return metadata
def _remove_all(self, method):
'''
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)
if item.endswith('manifest.xml'):
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)
mat.secure_remove(name)
elif item.endswith('.xml') or item == 'mimetype':
#keep .xml files, and the "manifest" file
if item != 'meta.xml': # contains the metadata
zipin.extract(item, self.tempdir)
zipout.write(name, item)
mat.secure_remove(name)
else:
zipin.extract(item, self.tempdir)
if os.path.isfile(name):
try:
cfile = mat.create_class_file(name, False,
self.add2archive)
if method == 'normal':
cfile.remove_all()
else:
cfile.remove_all_ugly()
logging.debug('Processing %s from %s' % (item,
self.filename))
zipout.write(name, item)
except:
logging.info('%s\' fileformat is not supported' % item)
if self.add2archive:
zipout.write(name, item)
mat.secure_remove(name)
zipout.comment = ''
logging.info('%s treated' % self.filename)
zipin.close()
zipout.close()
self.do_backup()
def is_clean(self):
'''
Check if the file is clean from harmful metadatas
'''
zipin = zipfile.ZipFile(self.filename, 'r')
try:
zipin.getinfo('meta.xml')
return False
except KeyError: # no meta.xml in the file
zipin.close()
czf = archive.ZipStripper(self.filename, self.parser,
'application/zip', self.backup, self.add2archive)
if czf.is_clean():
return True
else:
return False
return True
class PdfStripper(parser.GenericParser):
'''
Represent a pdf file
'''
def __init__(self, filename, parser, mime, backup, add2archive):
super(PdfStripper, self).__init__(filename, parser, mime, backup,
add2archive)
uri = 'file://' + os.path.abspath(self.filename)
self.password = None
self.document = poppler.document_new_from_file(uri, self.password)
self.meta_list = ('title', 'author', 'subject', 'keywords', 'creator',
'producer', 'creation-date', 'mod-date', 'metadata')
def is_clean(self):
'''
Check if the file is clean from harmful metadatas
'''
for key in self.meta_list:
if key == 'creation-date' or key == 'mod-date':
if self.document.get_property(key) != -1:
return False
else:
if self.document.get_property(key) is not None and \
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/
python-poppler is not documented at all : have fun ;)
'''
page = self.document.get_page(0)
page_width, page_height = page.get_size()
surface = cairo.PDFSurface(self.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 xrange(self.document.get_n_pages()):
page = self.document.get_page(pagenum)
context.translate(0, 0)
page.render(context) # render the page on context
context.show_page() # draw context on surface
surface.finish()
#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 = trailer.Info.Creator = None
writer = pdfrw.PdfWriter()
writer.trailer = trailer
writer.write(self.output)
self.do_backup()
def get_meta(self):
'''
Return a dict with all the meta of the file
'''
metadata = {}
for key in self.meta_list:
if key == 'creation-date' or key == 'mod-date':
#creation and modification are set to -1
if self.document.get_property(key) != -1:
metadata[key] = self.document.get_property(key)
else:
if self.document.get_property(key) is not None and \
self.document.get_property(key) != '':
metadata[key] = self.document.get_property(key)
return metadata
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