calibre-web/cps/uploader.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

#  This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
#    Copyright (C) 2012-2019 lemmsh cervinko Kennyl matthazinski OzzieIsaacs
#
#  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/>.

# import os
from tempfile import gettempdir
import hashlib
from collections import namedtuple
import os
from flask_babel import gettext as _
import comic
from cps import app
try:
    from lxml.etree import LXML_VERSION as lxmlversion
except ImportError:
    lxmlversion = None


try:
    from wand.image import Image
    from wand import version as ImageVersion
    from wand.exceptions import PolicyError
    use_generic_pdf_cover = False
except (ImportError, RuntimeError) as e:
    app.logger.warning('cannot import Image, generating pdf covers for pdf uploads will not work: %s', e)
    use_generic_pdf_cover = True
try:
    from PyPDF2 import PdfFileReader
    from PyPDF2 import __version__ as PyPdfVersion
    use_pdf_meta = True
except ImportError as e:
    app.logger.warning('cannot import PyPDF2, extracting pdf metadata will not work: %s', e)
    use_pdf_meta = False

try:
    import epub
    use_epub_meta = True
except ImportError as e:
    app.logger.warning('cannot import epub, extracting epub metadata will not work: %s', e)
    use_epub_meta = False

try:
    import fb2
    use_fb2_meta = True
except ImportError as e:
    app.logger.warning('cannot import fb2, extracting fb2 metadata will not work: %s', e)
    use_fb2_meta = False

__author__ = 'lemmsh'

BookMeta = namedtuple('BookMeta', 'file_path, extension, title, author, cover, description, tags, series, series_id, languages')

"""
 :rtype: BookMeta
"""


def process(tmp_file_path, original_file_name, original_file_extension):
    meta = None
    try:
        if ".PDF" == original_file_extension.upper():
            meta = pdf_meta(tmp_file_path, original_file_name, original_file_extension)
        if ".EPUB" == original_file_extension.upper() and use_epub_meta is True:
            meta = epub.get_epub_info(tmp_file_path, original_file_name, original_file_extension)
        if ".FB2" == original_file_extension.upper() and use_fb2_meta is True:
            meta = fb2.get_fb2_info(tmp_file_path, original_file_extension)
        if original_file_extension.upper() in ['.CBZ', '.CBT']:
            meta = comic.get_comic_info(tmp_file_path, original_file_name, original_file_extension)

    except Exception as ex:
        app.logger.warning('cannot parse metadata, using default: %s', ex)

    if meta and meta.title.strip() and meta.author.strip():
        return meta
    else:
        return default_meta(tmp_file_path, original_file_name, original_file_extension)


def default_meta(tmp_file_path, original_file_name, original_file_extension):
    return BookMeta(
        file_path=tmp_file_path,
        extension=original_file_extension,
        title=original_file_name,
        author=u"Unknown",
        cover=None,
        description="",
        tags="",
        series="",
        series_id="",
        languages="")


def pdf_meta(tmp_file_path, original_file_name, original_file_extension):

    if use_pdf_meta:
        pdf = PdfFileReader(open(tmp_file_path, 'rb'))
        doc_info = pdf.getDocumentInfo()
    else:
        doc_info = None

    if doc_info is not None:
        author = doc_info.author if doc_info.author else u"Unknown"
        title = doc_info.title if doc_info.title else original_file_name
        subject = doc_info.subject
    else:
        author = u"Unknown"
        title = original_file_name
        subject = ""
    return BookMeta(
        file_path=tmp_file_path,
        extension=original_file_extension,
        title=title,
        author=author,
        cover=pdf_preview(tmp_file_path, original_file_name),
        description=subject,
        tags="",
        series="",
        series_id="",
        languages="")


def pdf_preview(tmp_file_path, tmp_dir):
    if use_generic_pdf_cover:
        return None
    else:
        try:
            cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.jpg"
            with Image(filename=tmp_file_path + "[0]", resolution=150) as img:
                img.compression_quality = 88
                img.save(filename=os.path.join(tmp_dir, cover_file_name))
            return cover_file_name
        except PolicyError as ex:
            logger.warning('Pdf extraction forbidden by Imagemagick policy: %s', ex)
            return None
        except Exception as ex:
            logger.warning('Cannot extract cover image, using default: %s', ex)
            return None

def get_versions():
    if not use_generic_pdf_cover:
        IVersion = ImageVersion.MAGICK_VERSION
        WVersion = ImageVersion.VERSION
    else:
        IVersion = _(u'not installed')
        WVersion = _(u'not installed')
    if use_pdf_meta:
        PVersion='v'+PyPdfVersion
    else:
        PVersion=_(u'not installed')
    if lxmlversion:
        XVersion = 'v'+'.'.join(map(str, lxmlversion))
    else:
        XVersion = _(u'not installed')
    return {'Image Magick': IVersion, 'PyPdf': PVersion, 'lxml':XVersion, 'Wand Version': WVersion}


def upload(uploadfile):
    tmp_dir = os.path.join(gettempdir(), 'calibre_web')

    if not os.path.isdir(tmp_dir):
        os.mkdir(tmp_dir)

    filename = uploadfile.filename
    filename_root, file_extension = os.path.splitext(filename)
    md5 = hashlib.md5()
    md5.update(filename.encode('utf-8'))
    tmp_file_path = os.path.join(tmp_dir, md5.hexdigest())
    uploadfile.save(tmp_file_path)
    meta = process(tmp_file_path, filename_root, file_extension)
    return meta