Miroirs/lcpl-calibre-plugin
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lcpl-calibre-plugin/calibre-plugin/__init__.py

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Python
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Calibre plugin for Readium LCP "LCPL" files.
# This basically "converts" an LCPL license file into an EPUB (or PDF).
# Note that this does NOT remove the LCP DRM from the files.
# It just turns an LCPL license file into an eBook.
# To my knowledge there's no public program (yet) that can
# remove the DRM from Readium LCP eBooks, though it should
# be possible (easier than for Adobe DRM eBooks) to create
# such a program.
# I am not going to do that, though, as I don't want to
# get into legal trouble.
# Revision history:
# v0.0.1: First public version
# v0.0.2: Add support for Python2
# v0.0.3: Fix other FileTypePlugins
# v0.0.4: Fix Calibre Plugin index / updater
# v0.0.5: Fix Python2 bug, drop minimum Calibre version to 2.0.0
PLUGIN_NAME = "LCPL Input"
PLUGIN_VERSION_TUPLE = (0, 0, 5)
from calibre.customize import FileTypePlugin # type: ignore
__version__ = PLUGIN_VERSION = ".".join([str(x)for x in PLUGIN_VERSION_TUPLE])
# Ton of libraries
import json
import os, sys
import hashlib
try:
# Python 3
from urllib.request import Request, urlopen
except:
# Python 2
from urllib2 import Request, urlopen
import dateutil.parser
import datetime
import traceback
from zipfile import ZipFile, ZIP_STORED, ZIP_DEFLATED
from contextlib import closing
class LCPLInput(FileTypePlugin):
name = PLUGIN_NAME
description = "Downloads LCP-encrypted books from a LCPL license file. Note: This does not remove the LCP DRM."
supported_platforms = ['linux', 'osx', 'windows']
author = "Leseratte10"
version = PLUGIN_VERSION_TUPLE
minimum_calibre_version = (2, 0, 0)
file_types = set(['lcpl'])
on_import = True
on_preprocess = True
priority = 900
def initialize(self):
# Patch Calibre to consider "LCPL" a book. This makes LCPL files show up
# in the "Add Book" file selection, and it also makes the auto-add feature useable.
try:
from calibre.ebooks import BOOK_EXTENSIONS
if ("lcpl" not in BOOK_EXTENSIONS):
BOOK_EXTENSIONS.append("lcpl")
except:
print("{0} v{1}: Couldn't add LCPL to book extension list:".format(PLUGIN_NAME, PLUGIN_VERSION))
traceback.print_exc()
def is_customizable(self):
return True
def config_widget(self):
import calibre_plugins.lcplinput.config as config # type: ignore
return config.ConfigWidget(self.plugin_path)
def save_settings(self, config_widget):
config_widget.save_settings()
def parseLCPLdownloadBook(self, lcpl_string):
# type : lcpl_string: str
import calibre_plugins.lcplinput.prefs as prefs # type: ignore
settings = prefs.LCPLInput_Prefs()
# This function is called by the run function when it encounters an LCP license file
try:
license = json.loads(lcpl_string)
print("{0} v{1}: Found LCPL for book ID {2}".format(PLUGIN_NAME, PLUGIN_VERSION, license["id"]))
except:
print("{0} v{1}: LCPL license file invalid".format(PLUGIN_NAME, PLUGIN_VERSION))
return None
lic_start = None
lic_end = None
if ("rights" in license and "start" in license["rights"]):
lic_start = dateutil.parser.isoparse(license["rights"]["start"])
if ("rights" in license and "end" in license["rights"]):
lic_end = dateutil.parser.isoparse(license["rights"]["end"])
try:
# Python 3
currenttime = datetime.datetime.now(datetime.timezone.utc)
except:
# Python 2
if lic_start is not None:
lic_start = lic_start.replace(tzinfo=None)
if lic_end is not None:
lic_end = lic_end.replace(tzinfo=None)
currenttime = datetime.datetime.utcnow()
is_in_license_range = True
if lic_start is not None:
if lic_start > currenttime:
is_in_license_range = False
if lic_end is not None:
if lic_end < currenttime:
is_in_license_range = False
if not is_in_license_range:
print("{0} v{1}: WARNING: LCPL license expired (valid from {2} until {3})".format(PLUGIN_NAME, PLUGIN_VERSION, str(lic_start), str(lic_end)))
if settings["honor_license_time_limits"]:
return None
else:
print("{0} v{1}: User decided to override, try downloading anyways ...".format(PLUGIN_NAME, PLUGIN_VERSION))
dl_link = None
dl_size = 0
dl_sha256_hash = None
dl_is_buggy_template = False
for link in license["links"]:
if (
(link["rel"] == "publication" and link["type"] == "application/epub+zip") or
(link["rel"] == "publication" and link["type"] == "application/pdf")
):
dl_link = link["href"]
if "length" in link:
dl_size = link["length"]
if "hash" in link:
dl_sha256_hash = link["hash"].lower()
if link["type"] == "application/epub+zip":
dl_file_name_ext = ".epub"
elif link["type"] == "application/pdf":
dl_file_name_ext = ".pdf"
else:
dl_file_name_ext = ".zip"
# Check for templating:
if ("templated" in link and ((link["templated"] is True) or (link["templated"].lower() == "true"))):
# This is a templated URL. The license server is supposed to fix this, but you never know
# TODO: Not sure if this should be a Bool or a String ...
print("[ * ] Found templated URL - this is not supposed to happen. Will try to fix this ...")
dl_is_buggy_template = True
break
if dl_link is None:
print("{0} v{1}: No download link found in LCPL".format(PLUGIN_NAME, PLUGIN_VERSION))
return None
# Download book:
if settings["use_custom_ua"] and settings["useragent"] != "":
ua = settings["useragent"]
print("{0} v{1}: Downloading book from {2} with custom UA ...".format(PLUGIN_NAME, PLUGIN_VERSION, dl_link))
else:
# Get default UA that matches the OS
ua = settings.get_system_ua()
print("{0} v{1}: Downloading book from {2} with default UA ...".format(PLUGIN_NAME, PLUGIN_VERSION, dl_link))
outputname = self.temporary_file(dl_file_name_ext).name
try:
req = Request(url=dl_link, headers={'User-Agent': ua})
handler = urlopen(req)
chunksize = 16 * 1024
ret_code = handler.getcode()
if ret_code != 200:
print("{0} v{1}: Download returned error {2}".format(PLUGIN_NAME, PLUGIN_VERSION, ret_code))
raise Exception("DL error")
with open(outputname, "wb") as f:
while True:
chunk = handler.read(chunksize)
if not chunk:
break
f.write(chunk)
except Exception as e:
if dl_is_buggy_template:
print("{0} v{1}: Downloading book failed, try templating ...".format(PLUGIN_NAME, PLUGIN_VERSION))
else:
print("{0} v{1}: Downloading book failed!".format(PLUGIN_NAME, PLUGIN_VERSION))
return None
dl_link2 = dl_link.replace("{license_id}", license["id"])
if (dl_link2 != dl_link):
try:
req = Request(url=dl_link2, headers={'User-Agent': ua})
handler = urlopen(req)
chunksize = 16 * 1024
ret_code = handler.getcode()
if ret_code != 200:
print("{0} v{1}: Download returned error {2}".format(PLUGIN_NAME, PLUGIN_VERSION, ret_code))
raise Exception("DL error")
with open(outputname, "wb") as f:
while True:
chunk = handler.read(chunksize)
if not chunk:
break
f.write(chunk)
except Exception as e:
print("{0} v{1}: Downloading book failed even with templating".format(PLUGIN_NAME, PLUGIN_VERSION))
return None
else:
print("{0} v{1}: Templating enabled but not used.".format(PLUGIN_NAME, PLUGIN_VERSION))
return None
try:
total_length = int(req.headers.get('content-length'))
except:
total_length = None
# Download done, check length:
if (dl_size > 0 and os.path.getsize(outputname) != dl_size):
print("{0} v{1}: Invalid file length (LCPL file said {2} but server sent {3})".format(PLUGIN_NAME, PLUGIN_VERSION, dl_size, os.path.getsize(outputname)))
if (not settings["ignore_content_errors"]):
return None
if (total_length is not None and total_length > 0 and os.path.getsize(outputname) != total_length):
print("{0} v{1}: Invalid file length (server said {2} but actually sent {3})".format(PLUGIN_NAME, PLUGIN_VERSION, total_length, os.path.getsize(outputname)))
if (not settings["ignore_content_errors"]):
return None
# Check hash
if (dl_sha256_hash is not None):
hash = hashlib.sha256()
with open(outputname, "rb") as f:
while True:
data = f.read(8192)
if not data:
break
hash.update(data)
actual_hash = hash.hexdigest().lower()
if (dl_sha256_hash != actual_hash):
print("{0} v{1}: File SHA256 hash invalid".format(PLUGIN_NAME, PLUGIN_VERSION))
if (not settings["ignore_content_errors"]):
return None
# Write book to file system:
try:
# Inject license file
with closing(ZipFile(outputname, 'a')) as outfile:
outfile.writestr("META-INF/license.lcpl", lcpl_string)
except:
print("{0} v{1}: Error while writing output file".format(PLUGIN_NAME, PLUGIN_VERSION))
return None
return outputname
def run(self, path_to_ebook):
# This code gets called by Calibre with a path to the new book file.
# Check if it's actually a valid LCPL file.
print("{0} v{1}: Trying to parse file {2}".format(PLUGIN_NAME, PLUGIN_VERSION, os.path.basename(path_to_ebook)))
ftype = None
# Check file type:
with open(path_to_ebook, "rb") as bookfile:
dataSTR = bookfile.read().decode('latin-1')
try:
json_str = json.loads(dataSTR)
if ("id" in json_str and "encryption" in json_str and "profile" in json_str["encryption"]):
ftype = "LCPL"
print("{0} v{1}: Looks like this is a LCPL license file".format(PLUGIN_NAME, PLUGIN_VERSION))
except:
pass
# Okay, once we're here, ftype is either "LCPL" or None.
if ftype is None:
print("{0} v{1}: Looks like this file isn't supported by {0}".format(PLUGIN_NAME, PLUGIN_VERSION))
return path_to_ebook
elif ftype == "LCPL":
destination = self.parseLCPLdownloadBook(dataSTR)
if (destination is not None):
# Okay, looks like we turned the LCPL into a book (EPUB or PDF) successfully.
# Lets now call all FileType plugins that are supposed to run on incoming EPUB or PDF files.
try:
from calibre.customize.ui import _initialized_plugins, is_disabled
from calibre.customize import FileTypePlugin
original_file_for_plugins = destination
oo, oe = sys.stdout, sys.stderr
for plugin in _initialized_plugins:
#print("{0} v{1}: Plugin '{2}' has prio {3}".format(PLUGIN_NAME, PLUGIN_VERSION, plugin.name, plugin.priority))
# Check if this is a FileTypePlugin
if not isinstance(plugin, FileTypePlugin):
#print("{0} v{1}: Plugin '{2}' is no FileTypePlugin, skipping ...".format(PLUGIN_NAME, PLUGIN_VERSION, plugin.name))
continue
# Check if it's disabled
if is_disabled(plugin):
#print("{0} v{1}: Plugin '{2}' is disabled, skipping ...".format(PLUGIN_NAME, PLUGIN_VERSION, plugin.name))
continue
if plugin.name == self.name:
#print("{0} v{1}: Plugin '{2}' is me - skipping".format(PLUGIN_NAME, PLUGIN_VERSION, plugin.name))
continue
# Check if it's supposed to run on import:
if not plugin.on_import:
#print("{0} v{1}: Plugin '{2}' isn't supposed to run during import, skipping ...".format(PLUGIN_NAME, PLUGIN_VERSION, plugin.name))
continue
# Check filetype
# If neither the book file extension nor "*" is in the plugin,
# don't execute it.
my_file_type = os.path.splitext(destination)[-1].lower().replace('.', '')
if (not my_file_type in plugin.file_types):
#print("{0} v{1}: Plugin '{2}' doesn't support {3} files, skipping ...".format(PLUGIN_NAME, PLUGIN_VERSION, plugin.name, my_file_type))
continue
if ("lcpl" in plugin.file_types or "*" in plugin.file_types):
#print("{0} v{1}: Plugin '{2}' would run anyways, skipping ...".format(PLUGIN_NAME, PLUGIN_VERSION, plugin.name, my_file_type))
continue
print("{0} v{1}: Executing plugin {2} ...".format(PLUGIN_NAME, PLUGIN_VERSION, plugin.name))
plugin.original_path_to_file = original_file_for_plugins
try:
plugin_ret = None
plugin_ret = plugin.run(destination)
except:
print("{0} v{1}: Running file type plugin failed with traceback:".format(PLUGIN_NAME, PLUGIN_VERSION))
traceback.print_exc(file=oe)
# Restore stdout and stderr, in case a plugin broke them.
sys.stdout, sys.stderr = oo, oe
if plugin_ret is not None:
# If the plugin returned a new path, update that.
print("{0} v{1}: Plugin returned path '{2}', updating.".format(PLUGIN_NAME, PLUGIN_VERSION, plugin_ret))
destination = plugin_ret
else:
print("{0} v{1}: Plugin returned nothing - skipping".format(PLUGIN_NAME, PLUGIN_VERSION))
except:
print("{0} v{1}: Error while executing other plugins".format(PLUGIN_NAME, PLUGIN_VERSION))
traceback.print_exc()
pass
return destination
print("{0} v{1}: Failed, return original ...".format(PLUGIN_NAME, PLUGIN_VERSION))
return path_to_ebook
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