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import parser
import pdfrw
import os
import mat
import subprocess
import tempfile
import glob
class PdfStripper(parser.Generic_parser):
'''
Represent a pdf file, with the help of pdfrw
'''
def __init__(self, filename, realname, backup):
self.filename = filename
self.backup = backup
self.realname = realname
self.trailer = pdfrw.PdfReader(self.filename)
self.writer = pdfrw.PdfWriter()
self.convert = 'gm convert -antialias -enhance %s %s'
def remove_all(self):
'''
Remove all the meta fields that are compromizing
'''
self.trailer.Info.Title = ''
self.trailer.Info.Author = ''
self.trailer.Info.Producer = ''
self.trailer.Info.Creator = ''
self.trailer.Info.CreationDate = ''
self.trailer.Info.ModDate = ''
self.writer.trailer = self.trailer
self.writer.write(self.filename + parser.POSTFIX)
if self.backup is False:
mat.secure_remove(self.filename) #remove the old file
os.rename(self.filename + parser.POSTFIX, self.filename)
def remove_all_ugly(self):
'''
Transform each pages into a jpg, clean them,
then re-assemble them into a new pdf
'''
output_file = self.realname + parser.POSTFIX + '.pdf'
_, self.tmpdir = tempfile.mkstemp()
subprocess.call(self.convert % (self.filename, self.tmpdir +
'temp.jpg'), shell=True)#Convert pages to jpg
for current_file in glob.glob(self.tmpdir + 'temp*'):
#Clean every jpg image
class_file = mat.create_class_file(current_file, False)
class_file.remove_all()
subprocess.call(self.convert % (self.tmpdir +
'temp.jpg*', output_file), shell=True)#Assemble jpg into pdf
for current_file in glob.glob(self.tmpdir + 'temp*'):
#remove jpg files
mat.secure_remove(current_file)
if self.backup is False:
mat.secure_remove(self.filename) #remove the old file
os.rename(output_file, self.filename)#rename the new
name = self.realname
else:
name = output_file
class_file = mat.create_class_file(name, False)
class_file.remove_all()
def is_clean(self):
'''
Check if the file is clean from harmful metadatas
'''
for field in self.trailer.Info:
if field != '':
return False
return True
def get_meta(self):
'''
return a dict with all the meta of the file
'''
metadata = {}
for key, value in self.trailer.Info.iteritems():
metadata[key[1:]] = value[1:-1]
return metadata
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