Created
January 29, 2020 16:07
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#!/usr/bin/env python | |
# coding: utf-8 | |
# This file is part of Adblock Plus <http://adblockplus.org/>, | |
# Copyright (C) 2006-2014 Eyeo GmbH | |
# | |
# Adblock Plus is free software: you can redistribute it and/or modify | |
# it under the terms of the GNU General Public License version 3 as | |
# published by the Free Software Foundation. | |
# | |
# Adblock Plus is distributed in the hope that it will be useful, | |
# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
# GNU General Public License for more details. | |
# | |
# You should have received a copy of the GNU General Public License | |
# along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>. | |
############################################################################# | |
# This is a reference script to add checksums to downloadable # | |
# subscriptions. The checksum will be validated by Adblock Plus on download # | |
# and checksum mismatches (broken downloads) will be rejected. # | |
# # | |
# To add a checksum to a subscription file, run the script like this: # | |
# # | |
# python addChecksum.py < subscription.txt > subscriptionSigned.txt # | |
# # | |
# Note: your subscription file should be saved in UTF-8 encoding, otherwise # | |
# the operation will fail. # | |
# # | |
############################################################################# | |
import sys, re, codecs, hashlib, base64 | |
checksumRegexp = re.compile(r'^\s*!\s*checksum[\s\-:]+([\w\+\/=]+).*\n', re.I | re.M) | |
def addChecksum(data): | |
checksum = calculateChecksum(data) | |
data = re.sub(checksumRegexp, '', data) | |
data = re.sub(r'(\r?\n)', r'\1! Checksum: %s\1' % checksum, data, 1) | |
return data | |
def calculateChecksum(data): | |
md5 = hashlib.md5() | |
md5.update(normalize(data).encode('utf-8')) | |
return base64.b64encode(md5.digest()).rstrip('=') | |
def normalize(data): | |
data = re.sub(r'\r', '', data) | |
data = re.sub(r'\n+', '\n', data) | |
data = re.sub(checksumRegexp, '', data) | |
return data | |
def readStream(stream): | |
reader = codecs.getreader('utf8')(stream) | |
try: | |
return reader.read() | |
except Exception, e: | |
raise Exception('Failed reading data, most likely not encoded as UTF-8:\n%s' % e) | |
if __name__ == '__main__': | |
if sys.platform == "win32": | |
import os, msvcrt | |
msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY) | |
data = addChecksum(readStream(sys.stdin)) | |
sys.stdout.write(data.encode('utf-8')) |
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