mirror of
https://github.com/noDRM/DeDRM_tools.git
synced 2024-07-01 15:36:10 +06:00
189 lines
8.3 KiB
Python
189 lines
8.3 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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__license__ = 'GPL v3'
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__docformat__ = 'restructuredtext en'
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# Released under the terms of the GNU General Public Licence, version 3
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# <http://www.gnu.org/licenses/>
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#
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# Requires Calibre version 0.7.55 or higher.
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#
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# All credit given to i♥cabbages for the original standalone scripts.
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# I had the much easier job of converting them to a calibre plugin.
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#
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# This plugin is meant to decrypt Barnes & Noble Epubs that are protected
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# with a version of Adobe's Adept encryption. It is meant to function without having to
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# install any dependencies... other than having calibre installed, of course. It will still
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# work if you have Python and PyCrypto already installed, but they aren't necessary.
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#
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# Configuration:
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# Check out the plugin's configuration settings by clicking the "Customize plugin"
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# button when you have the "BnN ePub DeDRM" plugin highlighted (under Preferences->
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# Plugins->File type plugins). Once you have the configuration dialog open, you'll
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# see a Help link on the top right-hand side.
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#
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# Revision history:
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# 0.1.0 - Initial release
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# 0.1.1 - Allow Windows users to make use of openssl if they have it installed.
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# - Incorporated SomeUpdates zipfix routine.
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# 0.1.2 - bug fix for non-ascii file names in encryption.xml
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# 0.1.3 - Try PyCrypto on Windows first
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# 0.1.4 - update zipfix to deal with mimetype not in correct place
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# 0.1.5 - update zipfix to deal with completely missing mimetype files
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# 0.1.6 - update for the new calibre plugin interface
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# 0.1.7 - Fix for potential problem with PyCrypto
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# 0.1.8 - an updated/modified zipfix.py and included zipfilerugged.py
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# 0.2.0 - Completely overhauled plugin configuration dialog and key management/storage
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# 0.2.1 - added zipfix.py and included zipfilerugged.py from 0.1.8
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# 0.2.2 - added in potential fixes from 0.1.7 that had been missed.
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# 0.2.3 - fixed possible output/unicode problem
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# 0.2.4 - ditched nearly hopeless caselessStrCmp method in favor of uStrCmp.
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# - added ability to rename existing keys.
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# 0.2.5 - Major code change to use unaltered ignobleepub.py 3.6 and
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# - ignoblekeygen 2.4 and later.
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# 0.2.6 - Tweaked to eliminate issue with both ignoble and inept calibre plugins installed/enabled at once
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"""
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Decrypt Barnes & Noble ADEPT encrypted EPUB books.
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"""
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PLUGIN_NAME = u"Ignoble Epub DeDRM"
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PLUGIN_VERSION_TUPLE = (0, 2, 6)
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PLUGIN_VERSION = '.'.join([str(x) for x in PLUGIN_VERSION_TUPLE])
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# Include an html helpfile in the plugin's zipfile with the following name.
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RESOURCE_NAME = PLUGIN_NAME + '_Help.htm'
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import sys, os, re
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import zipfile
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from zipfile import ZipFile
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class IGNOBLEError(Exception):
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pass
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from calibre.customize import FileTypePlugin
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from calibre.constants import iswindows, isosx
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from calibre.gui2 import is_ok_to_use_qt
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# Wrap a stream so that output gets flushed immediately
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# and also make sure that any unicode strings get
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# encoded using "replace" before writing them.
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class SafeUnbuffered:
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def __init__(self, stream):
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self.stream = stream
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self.encoding = stream.encoding
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if self.encoding == None:
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self.encoding = "utf-8"
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def write(self, data):
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if isinstance(data,unicode):
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data = data.encode(self.encoding,"replace")
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self.stream.write(data)
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self.stream.flush()
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def __getattr__(self, attr):
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return getattr(self.stream, attr)
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class IgnobleDeDRM(FileTypePlugin):
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name = PLUGIN_NAME
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description = u"Removes DRM from secure Barnes & Noble epub files. Credit given to i♥cabbages for the original stand-alone scripts."
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supported_platforms = ['linux', 'osx', 'windows']
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author = u"DiapDealer, Apprentice Alf and i♥cabbages"
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version = PLUGIN_VERSION_TUPLE
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minimum_calibre_version = (0, 7, 55) # Compiled python libraries cannot be imported in earlier versions.
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file_types = set(['epub'])
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on_import = True
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priority = 101
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def run(self, path_to_ebook):
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# make sure any unicode output gets converted safely with 'replace'
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sys.stdout=SafeUnbuffered(sys.stdout)
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sys.stderr=SafeUnbuffered(sys.stderr)
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print u"{0} v{1}: Trying to decrypt {2}.".format(PLUGIN_NAME, PLUGIN_VERSION, os.path.basename(path_to_ebook))
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# First time use or first time after upgrade to new key-handling/storage method
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# or no keys configured. Give a visual prompt to configure.
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import calibre_plugins.ignobleepub.config as cfg
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if not cfg.prefs['configured']:
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titlemsg = '%s v%s' % (PLUGIN_NAME, PLUGIN_VERSION)
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errmsg = titlemsg + ' not (properly) configured!\n' + \
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'\nThis may be the first time you\'ve used this plugin' + \
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' (or the first time since upgrading this plugin).' + \
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' You\'ll need to open the customization dialog (Preferences->Plugins->File type plugins)' + \
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' and follow the instructions there.\n' + \
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'\nIf you don\'t use the ' + PLUGIN_NAME + ' plugin, you should disable or uninstall it.'
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if is_ok_to_use_qt():
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from PyQt4.Qt import QMessageBox
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d = QMessageBox(QMessageBox.Warning, titlemsg, errmsg )
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d.show()
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d.raise_()
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d.exec_()
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raise Exception('%s Plugin v%s: Plugin not configured.' % (PLUGIN_NAME, PLUGIN_VERSION))
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# Create a TemporaryPersistent file to work with.
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# Check original epub archive for zip errors.
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from calibre_plugins.ignobleepub import zipfix
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inf = self.temporary_file(u".epub")
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try:
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print u"{0} v{1}: Verifying zip archive integrity.".format(PLUGIN_NAME, PLUGIN_VERSION)
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fr = zipfix.fixZip(path_to_ebook, inf.name)
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fr.fix()
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except Exception, e:
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print u"{0} v{1}: Error \'{2}\' when checking zip archive.".format(PLUGIN_NAME, PLUGIN_VERSION, e.args[0])
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raise Exception(e)
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return
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#check the book
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from calibre_plugins.ignobleepub import ignobleepub
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if not ignobleepub.ignobleBook(inf.name):
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raise IGNOBLEError(u"{0} v{1}: {2} is not a secure Barnes & Noble ePub.".format(PLUGIN_NAME, PLUGIN_VERSION, os.path.basename(path_to_ebook)))
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# Attempt to decrypt epub with each encryption key (generated or provided).
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for keyname, userkey in cfg.prefs['keys'].items():
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keyname_masked = u"".join((u'X' if (x.isdigit()) else x) for x in keyname)
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print u"{0} v{1}: Trying Encryption key {2:s}".format(PLUGIN_NAME, PLUGIN_VERSION, keyname_masked)
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of = self.temporary_file(u".epub")
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# Give the user key, ebook and TemporaryPersistent file to the decryption function.
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result = ignobleepub.decryptBook(userkey, inf.name, of.name)
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of.close()
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# Decryption was successful return the modified PersistentTemporary
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# file to Calibre's import process.
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if result == 0:
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print u"{0} v{1}: Encryption successfully removed.".format(PLUGIN_NAME, PLUGIN_VERSION)
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return of.name
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break
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print u"{0} v{1}: Encryption key incorrect.".format(PLUGIN_NAME, PLUGIN_VERSION)
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# Something went wrong with decryption.
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# Import the original unmolested epub.
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raise IGNOBLEError(u"{0} v{1}: Ultimately failed to decrypt".format(PLUGIN_NAME, PLUGIN_VERSION))
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return
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def is_customizable(self):
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# return true to allow customization via the Plugin->Preferences.
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return True
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def config_widget(self):
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from calibre_plugins.ignobleepub.config import ConfigWidget
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# Extract the helpfile contents from in the plugin's zipfile.
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# The helpfile must be named <plugin name variable> + '_Help.htm'
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return ConfigWidget(self.load_resources(RESOURCE_NAME)[RESOURCE_NAME])
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def load_resources(self, names):
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ans = {}
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with ZipFile(self.plugin_path, 'r') as zf:
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for candidate in zf.namelist():
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if candidate in names:
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ans[candidate] = zf.read(candidate)
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return ans
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def save_settings(self, config_widget):
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config_widget.save_settings()
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