mirror of
https://github.com/janeczku/calibre-web
synced 2024-11-17 07:14:53 +00:00
318 lines
13 KiB
Python
318 lines
13 KiB
Python
#!/usr/bin/env python
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# -*- 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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from __future__ import division, print_function, unicode_literals
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import os
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import hashlib
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import struct
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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
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from .constants import BookMeta
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log = logger.create()
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try:
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from lxml.etree import LXML_VERSION as lxmlversion
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except ImportError:
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lxmlversion = None
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try:
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from wand.image import Image
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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 PyPDF2 import PdfFileReader
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from PyPDF2 import __version__ as PyPdfVersion
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use_pdf_meta = True
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except ImportError as e:
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log.debug('cannot import PyPDF2, extracting pdf metadata will not work: %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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try:
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from PIL import Image, ImageOps
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from PIL import __version__ as PILversion
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use_PIL = True
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except ImportError as e:
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log.debug('cannot import Pillow, using png and webp images as cover will not work: %s', e)
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use_generic_pdf_cover = True
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use_PIL = False
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__author__ = 'lemmsh'
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def process(tmp_file_path, original_file_name, original_file_extension):
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meta = None
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try:
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if ".PDF" == original_file_extension.upper():
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meta = pdf_meta(tmp_file_path, original_file_name, original_file_extension)
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if ".EPUB" == original_file_extension.upper() 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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if ".FB2" == original_file_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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if original_file_extension.upper() in ['.CBZ', '.CBT']:
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meta = comic.get_comic_info(tmp_file_path, original_file_name, original_file_extension)
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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 meta and meta.title.strip() and meta.author.strip():
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return meta
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else:
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return default_meta(tmp_file_path, original_file_name, original_file_extension)
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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=u"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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def pdf_meta(tmp_file_path, original_file_name, original_file_extension):
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if use_pdf_meta:
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pdf = PdfFileReader(open(tmp_file_path, 'rb'))
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doc_info = pdf.getDocumentInfo()
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else:
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doc_info = None
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if doc_info is not None:
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author = doc_info.author if doc_info.author else u"Unknown"
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title = doc_info.title if doc_info.title else original_file_name
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subject = doc_info.subject
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else:
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author = u"Unknown"
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title = original_file_name
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subject = ""
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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="",
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series="",
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series_id="",
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languages="")
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def CMYKInvert(img):
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return Image.merge(img.mode,[ImageOps.invert(b.convert('L')) for b in img.split()])
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def tiff_header_for_CCITT(width, height, img_size, CCITT_group=4):
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tiff_header_struct = '<' + '2s' + 'h' + 'l' + 'h' + 'hhll' * 8 + 'h'
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return struct.pack(tiff_header_struct,
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b'II', # Byte order indication: Little indian
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42, # Version number (always 42)
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8, # Offset to first IFD
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8, # Number of tags in IFD
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256, 4, 1, width, # ImageWidth, LONG, 1, width
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257, 4, 1, height, # ImageLength, LONG, 1, lenght
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258, 3, 1, 1, # BitsPerSample, SHORT, 1, 1
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259, 3, 1, CCITT_group, # Compression, SHORT, 1, 4 = CCITT Group 4 fax encoding
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262, 3, 1, 0, # Threshholding, SHORT, 1, 0 = WhiteIsZero
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273, 4, 1, struct.calcsize(tiff_header_struct), # StripOffsets, LONG, 1, len of header
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278, 4, 1, height, # RowsPerStrip, LONG, 1, lenght
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279, 4, 1, img_size, # StripByteCounts, LONG, 1, size of image
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0 # last IFD
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)
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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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else:
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if use_PIL:
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try:
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input1 = PdfFileReader(open(tmp_file_path, 'rb'), strict=False)
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page0 = input1.getPage(0)
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mediaBox = page0['/MediaBox']
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box = page0['/CropBox'] if '/CropBox' in page0 else mediaBox
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xObject = page0['/Resources']['/XObject'].getObject()
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for obj in xObject:
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if xObject[obj]['/Subtype'] == '/Image':
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size = (xObject[obj]['/Width'], xObject[obj]['/Height'])
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data = xObject[obj]._data
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mode = "P"
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if xObject[obj]['/ColorSpace'] == '/DeviceRGB':
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mode = "RGB"
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if xObject[obj]['/ColorSpace'] == '/DeviceCMYK':
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mode = "CMYK"
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if '/Filter' in xObject[obj]:
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if xObject[obj]['/Filter'] == '/FlateDecode':
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img = Image.frombytes(mode, size, data)
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cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.png"
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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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# img.save(obj[1:] + ".png")
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elif xObject[obj]['/Filter'] == '/DCTDecode':
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cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.jpg"
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img = open(cover_file_name, "wb")
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img.write(data)
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img.close()
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# Post processing
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img2 = Image.open(cover_file_name)
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width, height = img2.size
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if mode == 'CMYK':
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img2 = CMYKInvert(img2)
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img2 = img2.crop((box[0]/mediaBox[2]*width,
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box[1]/mediaBox[3]*height,
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box[2]/mediaBox[2]*width,
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box[3]/mediaBox[3]*height))
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img2.save(cover_file_name)
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return cover_file_name
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elif xObject[obj]['/Filter'] == '/JPXDecode':
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cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.jp2"
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img = open(cover_file_name, "wb")
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img.write(data)
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img.close()
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# Post processing
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img2 = Image.open(cover_file_name)
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width, height = img2.size
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if mode == 'CMYK':
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img2 = CMYKInvert(img2)
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img2 = img2.crop((box[0]/mediaBox[2]*width,
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box[1]/mediaBox[3]*height,
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box[2]/mediaBox[2]*width,
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box[3]/mediaBox[3]*height))
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img2.save(cover_file_name)
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return cover_file_name
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elif xObject[obj]['/Filter'] == '/CCITTFaxDecode':
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if xObject[obj]['/DecodeParms']['/K'] == -1:
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CCITT_group = 4
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else:
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CCITT_group = 3
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width = xObject[obj]['/Width']
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height = xObject[obj]['/Height']
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img_size = len(data)
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tiff_header = tiff_header_for_CCITT(width, height, img_size, CCITT_group)
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cover_file_name_tiff = os.path.splitext(tmp_file_path)[0] + obj[1:] + '.tiff'
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cover_file_name = os.path.splitext(tmp_file_path)[0] + obj[1:] + '.jpg'
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img = open(cover_file_name_tiff, "wb")
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img.write(tiff_header + data)
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img.close()
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# Post processing
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img2 = Image.open(cover_file_name_tiff)
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if img2.mode == '1':
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img2 = ImageOps.invert(img2.convert('RGB'))
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img2.save(cover_file_name)
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return cover_file_name
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else:
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img = Image.frombytes(mode, size, data)
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cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.png"
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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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# img.save(obj[1:] + ".png")
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except Exception as ex:
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print(ex)
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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(filename=tmp_file_path + "[0]", resolution=150) as img:
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img.compression_quality = 88
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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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return None
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def get_versions():
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if not use_generic_pdf_cover:
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IVersion = ImageVersion.MAGICK_VERSION
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WVersion = ImageVersion.VERSION
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else:
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IVersion = u'not installed'
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WVersion = u'not installed'
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if use_pdf_meta:
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PVersion='v'+PyPdfVersion
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else:
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PVersion=u'not installed'
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if lxmlversion:
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XVersion = 'v'+'.'.join(map(str, lxmlversion))
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else:
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XVersion = u'not installed'
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if use_PIL:
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PILVersion = 'v' + PILversion
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else:
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PILVersion = u'not installed'
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if comic.use_comic_meta:
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ComicVersion = u'installed'
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else:
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ComicVersion = u'not installed'
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return {'Image Magick': IVersion,
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'PyPdf': PVersion,
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'lxml':XVersion,
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'Wand': WVersion,
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'Pillow': PILVersion,
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'Comic_API': ComicVersion}
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def upload(uploadfile):
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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()
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md5.update(filename.encode('utf-8'))
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tmp_file_path = os.path.join(tmp_dir, md5.hexdigest())
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uploadfile.save(tmp_file_path)
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meta = process(tmp_file_path, filename_root, file_extension)
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return meta
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