Skip to content

Instantly share code, notes, and snippets.

@route
Last active August 29, 2015 14:14
Show Gist options
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
  • Save route/27268c5e05b23125c9e1 to your computer and use it in GitHub Desktop.
Save route/27268c5e05b23125c9e1 to your computer and use it in GitHub Desktop.
import re
import shutil
import argparse
from os import path
from sys import stderr
#
# Author: Daxda
# Date: 02.04.2014
# WTF: This is a quick tool I've hacked together to easily remove the meta
# information as well as the annoying link on each page of eBooks down-
# loaded from it-ebooks.info. The modified file will hold the original
# file name and the original file will be renamed to 'original.pdf.OLD'
#
#
# 'pattern' is the regex pattern which is used to remove the annotation elements,
# the rough structure of it looks like this:
#
# obj
# <<
# /Type /Annot
# /Subtype /Link
# /Rect [ 264 91 348 79 ] # The digits on this line will differ
# /Border [ 0 0 0 ] # The same goes for the digits on this line
# /A <<
# /Type /Action
# /S /URI
# /URI (http://www.it-ebooks.info/)
# >>
# >>
# endobj
#
pattern = """0a2f54797065202f416e6e6f740a2f53756274797065202f4c696e6b0a2f526563
74205b20.*?205d0a2f426f7264657220.*?\n0a2f41203c3c0a2f54797065202f416374696f6e0
a2f53202f5552490a2f5552492028687474703a2f2f7777772e69742d65626f6f6b732e696e666f
2f290a3e3e""".replace("\n", "").strip()
def remove_evil_links(pdf_data):
""" Removes all it-ebook's links and metadata from the passed PDF data. """
pdf_data = pdf_data.encode("hex")
# Remove each annotation element inside the PDF file (This removes the
# "clickable" it-ebooks.info links)
new_data = re.sub(pattern, "", pdf_data)
# Remove the actual links (link elements which are assigned to the annotations)
new_data = new_data.replace("www.it-ebooks.info".encode("hex"), "")
return new_data.decode("hex")
def main(args):
try:
args.files = list(set(args.files))
for file_path in args.files:
if not file_path:
continue
if args.verbose:
print("Processing: {0}".format(file_path))
try:
with open(file_path, "rb") as input_file:
pdf_data = input_file.read()
except IOError as e:
stderr.write("{0}: {1}\n".format(file_path, e.strerror))
stderr.flush()
continue
# Backup the file with a different name
if not args.no_backup:
if args.verbose:
print("Creating backup: {0}.OLD".format(file_path))
shutil.move(file_path, "{0}.OLD".format(file_path))
# Modify the PDF file
new_pdf_data = remove_evil_links(pdf_data)
# Save the new file
with open(file_path, "wb") as out_file:
out_file.write(new_pdf_data)
if args.verbose:
print("Saving modified file: {0}".format(file_path))
except KeyboardInterrupt:
pass
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("-f", "--files",
help="One or more PDF files to remove it-ebook's watermarks.",
nargs="*", required=True)
parser.add_argument("--no-backup",
help="Disables the creating of backups for the files which"+\
" are being processed. ",
action="store_true")
parser.add_argument("-v", "--verbose", action="store_true")
args = parser.parse_args()
main(args)
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment