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117 lines
3.6 KiB
Python
117 lines
3.6 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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from __future__ import with_statement
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from __future__ import print_function
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# Engine to remove drm from Kindle KFX ebooks
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import os
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import shutil
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import zipfile
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try:
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from cStringIO import StringIO
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except ImportError:
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from StringIO import StringIO
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try:
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from calibre_plugins.dedrm import ion
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except ImportError:
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import ion
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__license__ = 'GPL v3'
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__version__ = '1.0'
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class KFXZipBook:
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def __init__(self, infile):
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self.infile = infile
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self.voucher = None
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self.decrypted = {}
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def getPIDMetaInfo(self):
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return (None, None)
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def processBook(self, totalpids):
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with zipfile.ZipFile(self.infile, 'r') as zf:
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for filename in zf.namelist():
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with zf.open(filename) as fh:
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data = fh.read(8)
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if data != '\xeaDRMION\xee':
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continue
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data += fh.read()
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if self.voucher is None:
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self.decrypt_voucher(totalpids)
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print(u'Decrypting KFX DRMION: {0}'.format(filename))
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outfile = StringIO()
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ion.DrmIon(StringIO(data[8:-8]), lambda name: self.voucher).parse(outfile)
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self.decrypted[filename] = outfile.getvalue()
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if not self.decrypted:
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print(u'The .kfx-zip archive does not contain an encrypted DRMION file')
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def decrypt_voucher(self, totalpids):
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with zipfile.ZipFile(self.infile, 'r') as zf:
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for info in zf.infolist():
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with zf.open(info.filename) as fh:
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data = fh.read(4)
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if data != '\xe0\x01\x00\xea':
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continue
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data += fh.read()
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if 'ProtectedData' in data:
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break # found DRM voucher
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else:
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raise Exception(u'The .kfx-zip archive contains an encrypted DRMION file without a DRM voucher')
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print(u'Decrypting KFX DRM voucher: {0}'.format(info.filename))
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for pid in [''] + totalpids:
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for dsn_len,secret_len in [(0,0), (16,0), (16,40), (32,40), (40,0), (40,40)]:
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if len(pid) == dsn_len + secret_len:
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break # split pid into DSN and account secret
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else:
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continue
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try:
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voucher = ion.DrmIonVoucher(StringIO(data), pid[:dsn_len], pid[dsn_len:])
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voucher.parse()
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voucher.decryptvoucher()
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break
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except:
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pass
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else:
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raise Exception(u'Failed to decrypt KFX DRM voucher with any key')
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print(u'KFX DRM voucher successfully decrypted')
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license_type = voucher.getlicensetype()
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if license_type != "Purchase":
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raise Exception((u'This book is licensed as {0}. '
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'These tools are intended for use on purchased books.').format(license_type))
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self.voucher = voucher
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def getBookTitle(self):
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return os.path.splitext(os.path.split(self.infile)[1])[0]
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def getBookExtension(self):
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return '.kfx-zip'
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def getBookType(self):
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return 'KFX-ZIP'
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def cleanup(self):
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pass
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def getFile(self, outpath):
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if not self.decrypted:
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shutil.copyfile(self.infile, outpath)
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else:
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with zipfile.ZipFile(self.infile, 'r') as zif:
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with zipfile.ZipFile(outpath, 'w') as zof:
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for info in zif.infolist():
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zof.writestr(info, self.decrypted.get(info.filename, zif.read(info.filename)))
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