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