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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# This is a python script. You need a Python interpreter to run it.
# For example, ActiveState Python, which exists for windows.
#
# Changelog drmcheck
# 1.00 - Initial version, with code from various other scripts
# 1.01 - Moved authorship announcement to usage section.
#
# Changelog epubtest
# 1.00 - Cut to epubtest.py, testing ePub files only by Apprentice Alf
# 1.01 - Added routine for use by Windows DeDRM
# 2.00 - Python 3, September 2020
# 2.01 - Add new Adobe DRM, add Readium LCP
#
# Written in 2011 by Paul Durrant
# Released with unlicense. See http://unlicense.org/
#
#############################################################################
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
#############################################################################
#
# It's still polite to give attribution if you do reuse this code.
#
__version__ = '2.0'
#@@CALIBRE_COMPAT_CODE@@
import sys, struct, os, traceback
import zlib
import zipfile
import xml.etree.ElementTree as etree
from .argv_utils import unicode_argv
NSMAP = {'adept': 'http://ns.adobe.com/adept',
'enc': 'http://www.w3.org/2001/04/xmlenc#'}
from .utilities import SafeUnbuffered
_FILENAME_LEN_OFFSET = 26
_EXTRA_LEN_OFFSET = 28
_FILENAME_OFFSET = 30
_MAX_SIZE = 64 * 1024
def uncompress(cmpdata):
dc = zlib.decompressobj(-15)
data = ''
while len(cmpdata) > 0:
if len(cmpdata) > _MAX_SIZE :
newdata = cmpdata[0:_MAX_SIZE]
cmpdata = cmpdata[_MAX_SIZE:]
else:
newdata = cmpdata
cmpdata = ''
newdata = dc.decompress(newdata)
unprocessed = dc.unconsumed_tail
if len(unprocessed) == 0:
newdata += dc.flush()
data += newdata
cmpdata += unprocessed
unprocessed = ''
return data
def getfiledata(file, zi):
# get file name length and exta data length to find start of file data
local_header_offset = zi.header_offset
file.seek(local_header_offset + _FILENAME_LEN_OFFSET)
leninfo = file.read(2)
local_name_length, = struct.unpack('<H', leninfo)
file.seek(local_header_offset + _EXTRA_LEN_OFFSET)
exinfo = file.read(2)
extra_field_length, = struct.unpack('<H', exinfo)
file.seek(local_header_offset + _FILENAME_OFFSET + local_name_length + extra_field_length)
data = None
# if not compressed we are good to go
if zi.compress_type == zipfile.ZIP_STORED:
data = file.read(zi.file_size)
# if compressed we must decompress it using zlib
if zi.compress_type == zipfile.ZIP_DEFLATED:
cmpdata = file.read(zi.compress_size)
data = uncompress(cmpdata)
return data
def encryption(infile):
# Supports Adobe (old & new), B&N, Kobo, Apple, Readium LCP.
encryption = "Error"
try:
with open(infile,'rb') as infileobject:
bookdata = infileobject.read(58)
# Check for Zip
if bookdata[0:0+2] == b"PK":
inzip = zipfile.ZipFile(infile,'r')
namelist = set(inzip.namelist())
if (
'META-INF/encryption.xml' in namelist and
'META-INF/license.lcpl' in namelist and
b"EncryptedContentKey" in inzip.read("META-INF/encryption.xml")):
encryption = "Readium LCP"
elif 'META-INF/sinf.xml' in namelist and b"fairplay" in inzip.read("META-INF/sinf.xml"):
# Untested, just found this info on Google
encryption = "Apple"
elif 'META-INF/rights.xml' in namelist and b"<kdrm>" in inzip.read("META-INF/rights.xml"):
# Untested, just found this info on Google
encryption = "Kobo"
elif 'META-INF/rights.xml' not in namelist or 'META-INF/encryption.xml' not in namelist:
encryption = "Unencrypted"
else:
try:
rights = etree.fromstring(inzip.read('META-INF/rights.xml'))
adept = lambda tag: '{%s}%s' % (NSMAP['adept'], tag)
expr = './/%s' % (adept('encryptedKey'),)
bookkey = ''.join(rights.findtext(expr))
if len(bookkey) >= 172:
encryption = "Adobe"
elif len(bookkey) == 64:
encryption = "B&N"
else:
encryption = "Unknown (key len " + str(len(bookkey)) + ")"
except:
encryption = "Unknown"
except:
traceback.print_exc()
return encryption
def main():
argv=unicode_argv("epubtest.py")
if len(argv) < 2:
print("Give an ePub file as a parameter.")
else:
print(encryption(argv[1]))
return 0
if __name__ == "__main__":
sys.stdout=SafeUnbuffered(sys.stdout)
sys.stderr=SafeUnbuffered(sys.stderr)
sys.exit(main())
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