calibre-web/cps/epub.py

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
# Copyright (C) 2018 lemmsh, Kennyl, Kyosfonica, matthazinski
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from __future__ import division, print_function, unicode_literals
import os
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import zipfile
from lxml import etree
from . import isoLanguages
from .constants import BookMeta
def extractCover(zipFile, coverFile, coverpath, tmp_file_name):
if coverFile is None:
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return None
else:
zipCoverPath = os.path.join(coverpath, coverFile).replace('\\', '/')
cf = zipFile.read(zipCoverPath)
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prefix = os.path.splitext(tmp_file_name)[0]
tmp_cover_name = prefix + '.' + os.path.basename(zipCoverPath)
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image = open(tmp_cover_name, 'wb')
image.write(cf)
image.close()
return tmp_cover_name
def get_epub_info(tmp_file_path, original_file_name, original_file_extension):
ns = {
'n': 'urn:oasis:names:tc:opendocument:xmlns:container',
'pkg': 'http://www.idpf.org/2007/opf',
'dc': 'http://purl.org/dc/elements/1.1/'
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}
epubZip = zipfile.ZipFile(tmp_file_path)
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txt = epubZip.read('META-INF/container.xml')
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tree = etree.fromstring(txt)
cfname = tree.xpath('n:rootfiles/n:rootfile/@full-path', namespaces=ns)[0]
cf = epubZip.read(cfname)
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tree = etree.fromstring(cf)
coverpath = os.path.dirname(cfname)
p = tree.xpath('/pkg:package/pkg:metadata', namespaces=ns)[0]
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epub_metadata = {}
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for s in ['title', 'description', 'creator', 'language', 'subject']:
tmp = p.xpath('dc:%s/text()' % s, namespaces=ns)
if len(tmp) > 0:
epub_metadata[s] = p.xpath('dc:%s/text()' % s, namespaces=ns)[0]
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else:
epub_metadata[s] = "Unknown"
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if epub_metadata['subject'] == "Unknown":
epub_metadata['subject'] = ''
if epub_metadata['description'] == "Unknown":
description = tree.xpath("//*[local-name() = 'description']/text()")
if len(description) > 0:
epub_metadata['description'] = description
else:
epub_metadata['description'] = ""
if epub_metadata['language'] == "Unknown":
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epub_metadata['language'] = ""
else:
lang = epub_metadata['language'].split('-', 1)[0].lower()
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if len(lang) == 2:
epub_metadata['language'] = isoLanguages.get(part1=lang).name
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elif len(lang) == 3:
epub_metadata['language'] = isoLanguages.get(part3=lang).name
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else:
epub_metadata['language'] = ""
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series = tree.xpath("/pkg:package/pkg:metadata/pkg:meta[@name='calibre:series']/@content", namespaces=ns)
if len(series) > 0:
epub_metadata['series'] = series[0]
else:
epub_metadata['series'] = ''
series_id = tree.xpath("/pkg:package/pkg:metadata/pkg:meta[@name='calibre:series_index']/@content", namespaces=ns)
if len(series_id) > 0:
epub_metadata['series_id'] = series_id[0]
else:
epub_metadata['series_id'] = '1'
coversection = tree.xpath("/pkg:package/pkg:manifest/pkg:item[@id='cover-image']/@href", namespaces=ns)
coverfile = None
if len(coversection) > 0:
coverfile = extractCover(epubZip, coversection[0], coverpath, tmp_file_path)
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else:
meta_cover = tree.xpath("/pkg:package/pkg:metadata/pkg:meta[@name='cover']/@content", namespaces=ns)
if len(meta_cover) > 0:
coversection = tree.xpath("/pkg:package/pkg:manifest/pkg:item[@id='"+meta_cover[0]+"']/@href", namespaces=ns)
if len(coversection) > 0:
filetype = coversection[0].rsplit('.', 1)[-1]
if filetype == "xhtml" or filetype == "html": # if cover is (x)html format
markup = epubZip.read(os.path.join(coverpath, coversection[0]))
markupTree = etree.fromstring(markup)
# no matter xhtml or html with no namespace
imgsrc = markupTree.xpath("//*[local-name() = 'img']/@src")
# imgsrc maybe startwith "../"" so fullpath join then relpath to cwd
filename = os.path.relpath(os.path.join(os.path.dirname(os.path.join(coverpath, coversection[0])), imgsrc[0]))
coverfile = extractCover(epubZip, filename, "", tmp_file_path)
else:
coverfile = extractCover(epubZip, coversection[0], coverpath, tmp_file_path)
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if not epub_metadata['title']:
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title = original_file_name
else:
title = epub_metadata['title']
return BookMeta(
file_path=tmp_file_path,
extension=original_file_extension,
title=title.encode('utf-8').decode('utf-8'),
author=epub_metadata['creator'].encode('utf-8').decode('utf-8'),
cover=coverfile,
description=epub_metadata['description'],
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tags=epub_metadata['subject'].encode('utf-8').decode('utf-8'),
series=epub_metadata['series'].encode('utf-8').decode('utf-8'),
series_id=epub_metadata['series_id'].encode('utf-8').decode('utf-8'),
languages=epub_metadata['language'])