DeDRM_tools/DeDRM_calibre_plugin/DeDRM_plugin/epubtest.py

#!/usr/bin/python
#
# 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
#
# 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.
#

from __future__ import with_statement

__version__ = '1.00'

import sys, struct, os
import zlib
import zipfile
import xml.etree.ElementTree as etree

NSMAP = {'adept': 'http://ns.adobe.com/adept',
         'enc': 'http://www.w3.org/2001/04/xmlenc#'}

# Wrap a stream so that output gets flushed immediately
# and also make sure that any unicode strings get
# encoded using "replace" before writing them.
class SafeUnbuffered:
    def __init__(self, stream):
        self.stream = stream
        self.encoding = stream.encoding
        if self.encoding == None:
            self.encoding = "utf-8"
    def write(self, data):
        if isinstance(data,unicode):
            data = data.encode(self.encoding,"replace")
        self.stream.write(data)
        self.stream.flush()
    def __getattr__(self, attr):
        return getattr(self.stream, attr)

def unicode_argv():
    argvencoding = sys.stdin.encoding
    if argvencoding == None:
        argvencoding = "utf-8"
    return [arg if (type(arg) == unicode) else unicode(arg,argvencoding) for arg in sys.argv]

_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 main(argv=unicode_argv()):
    infile = argv[1]
    kind = "Unknown"
    encryption = "Unknown"
    with file(infile,'rb') as infileobject:
        bookdata = infileobject.read(58)
        # Check for Mobipocket/Kindle
        if bookdata[0:0+2] == "PK":
            if bookdata[30:30+28] == 'mimetypeapplication/epub+zip':
                kind = "ePub"
            else:
                kind = "ZIP"
            encryption = "Unencrypted"
            foundrights = False
            foundencryption = False
            inzip = zipfile.ZipFile(infile,'r')
            namelist = set(inzip.namelist())
            if 'META-INF/rights.xml' not in namelist or 'META-INF/encryption.xml' not in namelist:
                encryption = "Unencrypted"
            else:
                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"

    print u"{0} {1}".format(encryption, kind)
    return 0

if __name__ == "__main__":
    sys.stdout=SafeUnbuffered(sys.stdout)
    sys.stderr=SafeUnbuffered(sys.stderr)
    sys.exit(main())