mirror of
https://github.com/janeczku/calibre-web
synced 2024-10-31 15:20:28 +00:00
264 lines
8.8 KiB
Python
264 lines
8.8 KiB
Python
# -*- coding: utf-8 -*-
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# This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
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# Copyright (C) 2012-2019 lemmsh cervinko Kennyl matthazinski OzzieIsaacs
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import os
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import hashlib
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from tempfile import gettempdir
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from flask_babel import gettext as _
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from . import logger, comic, isoLanguages
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from .constants import BookMeta
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from .helper import split_authors
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log = logger.create()
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try:
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from wand.image import Image, Color
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from wand import version as ImageVersion
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from wand.exceptions import PolicyError
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use_generic_pdf_cover = False
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except (ImportError, RuntimeError) as e:
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log.debug('Cannot import Image, generating pdf covers for pdf uploads will not work: %s', e)
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use_generic_pdf_cover = True
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try:
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from PyPDF import PdfReader
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use_pdf_meta = True
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except ImportError as ex:
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log.debug('PyPDF is recommended for best performance in metadata extracting from pdf files: %s', ex)
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try:
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from PyPDF2 import PdfReader
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use_pdf_meta = True
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except ImportError as ex:
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log.debug('PyPDF is recommended for best performance in metadata extracting from pdf files: %s', ex)
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log.debug('PyPdf2 is also possible for metadata extracting from pdf files, but not recommended anymore')
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try:
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from PyPDF3 import PdfFileReader as PdfReader
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use_pdf_meta = True
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except ImportError as e:
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log.debug('Cannot import PyPDF3/PyPDF2, extracting pdf metadata will not work: %s / %s', e)
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use_pdf_meta = False
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try:
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from . import epub
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use_epub_meta = True
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except ImportError as e:
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log.debug('Cannot import epub, extracting epub metadata will not work: %s', e)
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use_epub_meta = False
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try:
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from . import fb2
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use_fb2_meta = True
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except ImportError as e:
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log.debug('Cannot import fb2, extracting fb2 metadata will not work: %s', e)
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use_fb2_meta = False
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def process(tmp_file_path, original_file_name, original_file_extension, rarExecutable):
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meta = default_meta(tmp_file_path, original_file_name, original_file_extension)
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extension_upper = original_file_extension.upper()
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try:
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if ".PDF" == extension_upper:
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meta = pdf_meta(tmp_file_path, original_file_name, original_file_extension)
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elif extension_upper in [".KEPUB", ".EPUB"] and use_epub_meta is True:
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meta = epub.get_epub_info(tmp_file_path, original_file_name, original_file_extension)
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elif ".FB2" == extension_upper and use_fb2_meta is True:
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meta = fb2.get_fb2_info(tmp_file_path, original_file_extension)
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elif extension_upper in ['.CBZ', '.CBT', '.CBR']:
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meta = comic.get_comic_info(tmp_file_path,
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original_file_name,
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original_file_extension,
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rarExecutable)
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except Exception as ex:
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log.warning('cannot parse metadata, using default: %s', ex)
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if not meta.title.strip():
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meta = original_file_name
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if not meta.author.strip() or meta.author.lower() == 'unknown':
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meta = meta._replace(author=_('Unknown'))
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return meta
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def default_meta(tmp_file_path, original_file_name, original_file_extension):
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return BookMeta(
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file_path=tmp_file_path,
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extension=original_file_extension,
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title=original_file_name,
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author=_('Unknown'),
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cover=None,
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description="",
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tags="",
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series="",
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series_id="",
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languages="",
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publisher="",
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pubdate="",
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identifiers=[]
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)
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def parse_xmp(pdf_file):
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"""
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Parse XMP Metadata and prepare for BookMeta object
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"""
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try:
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xmp_info = pdf_file.xmp_metadata
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except Exception as ex:
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log.debug('Can not read PDF XMP metadata {}'.format(ex))
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return None
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if xmp_info:
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try:
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xmp_author = xmp_info.dc_creator # list
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except AttributeError:
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xmp_author = ['Unknown']
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if xmp_info.dc_title:
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xmp_title = xmp_info.dc_title['x-default']
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else:
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xmp_title = ''
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if xmp_info.dc_description:
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xmp_description = xmp_info.dc_description['x-default']
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else:
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xmp_description = ''
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languages = []
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try:
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for i in xmp_info.dc_language:
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languages.append(isoLanguages.get_lang3(i))
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except AttributeError:
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languages.append('')
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xmp_tags = ', '.join(xmp_info.dc_subject)
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xmp_publisher = ', '.join(xmp_info.dc_publisher)
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return {'author': xmp_author,
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'title': xmp_title,
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'subject': xmp_description,
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'tags': xmp_tags,
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'languages': languages,
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'publisher': xmp_publisher
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}
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def pdf_meta(tmp_file_path, original_file_name, original_file_extension):
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doc_info = None
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xmp_info = None
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if use_pdf_meta:
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with open(tmp_file_path, 'rb') as f:
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pdf_file = PdfReader(f)
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try:
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doc_info = pdf_file.metadata
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except Exception as exc:
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log.debug('Can not read PDF DocumentInfo {}'.format(exc))
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xmp_info = parse_xmp(pdf_file)
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if xmp_info:
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author = ' & '.join(split_authors(xmp_info['author']))
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title = xmp_info['title']
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subject = xmp_info['subject']
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tags = xmp_info['tags']
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languages = xmp_info['languages']
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publisher = xmp_info['publisher']
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else:
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author = 'Unknown'
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title = ''
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languages = [""]
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publisher = ""
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subject = ""
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tags = ""
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if doc_info:
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if author == '':
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author = ' & '.join(split_authors([doc_info.author])) if doc_info.author else 'Unknown'
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if title == '':
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title = doc_info.title if doc_info.title else original_file_name
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if subject == '':
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subject = doc_info.subject or ""
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if tags == '' and '/Keywords' in doc_info:
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if isinstance(doc_info['/Keywords'], bytes):
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tags = doc_info['/Keywords'].decode('utf-8')
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else:
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tags = doc_info['/Keywords']
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else:
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title = original_file_name
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return BookMeta(
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file_path=tmp_file_path,
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extension=original_file_extension,
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title=title,
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author=author,
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cover=pdf_preview(tmp_file_path, original_file_name),
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description=subject,
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tags=tags,
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series="",
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series_id="",
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languages=','.join(languages),
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publisher=publisher,
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pubdate="",
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identifiers=[])
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def pdf_preview(tmp_file_path, tmp_dir):
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if use_generic_pdf_cover:
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return None
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try:
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cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.jpg"
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with Image() as img:
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img.options["pdf:use-cropbox"] = "true"
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img.read(filename=tmp_file_path + '[0]', resolution=150)
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img.compression_quality = 88
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if img.alpha_channel:
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img.alpha_channel = 'remove'
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img.background_color = Color('white')
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img.save(filename=os.path.join(tmp_dir, cover_file_name))
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return cover_file_name
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except PolicyError as ex:
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log.warning('Pdf extraction forbidden by Imagemagick policy: %s', ex)
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return None
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except Exception as ex:
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log.warning('Cannot extract cover image, using default: %s', ex)
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log.warning('On Windows this error could be caused by missing ghostscript')
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return None
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def get_magick_version():
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ret = dict()
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if not use_generic_pdf_cover:
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ret['Image Magick'] = ImageVersion.MAGICK_VERSION
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else:
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ret['Image Magick'] = 'not installed'
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return ret
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def upload(uploadfile, rarExcecutable):
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tmp_dir = os.path.join(gettempdir(), 'calibre_web')
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if not os.path.isdir(tmp_dir):
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os.mkdir(tmp_dir)
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filename = uploadfile.filename
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filename_root, file_extension = os.path.splitext(filename)
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md5 = hashlib.md5(filename.encode('utf-8')).hexdigest() # nosec
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tmp_file_path = os.path.join(tmp_dir, md5)
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log.debug("Temporary file: %s", tmp_file_path)
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uploadfile.save(tmp_file_path)
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return process(tmp_file_path, filename_root, file_extension, rarExcecutable)
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