calibre-web/cps/uploader.py
2019-10-22 19:11:40 +02:00

318 lines
13 KiB
Python

#!/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/>.
from __future__ import division, print_function, unicode_literals
import os
import hashlib
import struct
from tempfile import gettempdir
from flask_babel import gettext as _
from . import logger, comic
from .constants import BookMeta
log = logger.create()
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:
log.debug('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:
log.debug('cannot import PyPDF2, extracting pdf metadata will not work: %s', e)
use_pdf_meta = False
try:
from . import epub
use_epub_meta = True
except ImportError as e:
log.debug('cannot import epub, extracting epub metadata will not work: %s', e)
use_epub_meta = False
try:
from . import fb2
use_fb2_meta = True
except ImportError as e:
log.debug('cannot import fb2, extracting fb2 metadata will not work: %s', e)
use_fb2_meta = False
try:
from PIL import Image, ImageOps
from PIL import __version__ as PILversion
use_PIL = True
except ImportError as e:
log.debug('cannot import Pillow, using png and webp images as cover will not work: %s', e)
use_generic_pdf_cover = True
use_PIL = False
__author__ = 'lemmsh'
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:
log.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 CMYKInvert(img):
return Image.merge(img.mode,[ImageOps.invert(b.convert('L')) for b in img.split()])
def tiff_header_for_CCITT(width, height, img_size, CCITT_group=4):
tiff_header_struct = '<' + '2s' + 'h' + 'l' + 'h' + 'hhll' * 8 + 'h'
return struct.pack(tiff_header_struct,
b'II', # Byte order indication: Little indian
42, # Version number (always 42)
8, # Offset to first IFD
8, # Number of tags in IFD
256, 4, 1, width, # ImageWidth, LONG, 1, width
257, 4, 1, height, # ImageLength, LONG, 1, lenght
258, 3, 1, 1, # BitsPerSample, SHORT, 1, 1
259, 3, 1, CCITT_group, # Compression, SHORT, 1, 4 = CCITT Group 4 fax encoding
262, 3, 1, 0, # Threshholding, SHORT, 1, 0 = WhiteIsZero
273, 4, 1, struct.calcsize(tiff_header_struct), # StripOffsets, LONG, 1, len of header
278, 4, 1, height, # RowsPerStrip, LONG, 1, lenght
279, 4, 1, img_size, # StripByteCounts, LONG, 1, size of image
0 # last IFD
)
def pdf_preview(tmp_file_path, tmp_dir):
if use_generic_pdf_cover:
return None
else:
if use_PIL:
try:
input1 = PdfFileReader(open(tmp_file_path, 'rb'), strict=False)
page0 = input1.getPage(0)
mediaBox = page0['/MediaBox']
box = page0['/CropBox'] if '/CropBox' in page0 else mediaBox
xObject = page0['/Resources']['/XObject'].getObject()
for obj in xObject:
if xObject[obj]['/Subtype'] == '/Image':
size = (xObject[obj]['/Width'], xObject[obj]['/Height'])
data = xObject[obj]._data
mode = "P"
if xObject[obj]['/ColorSpace'] == '/DeviceRGB':
mode = "RGB"
if xObject[obj]['/ColorSpace'] == '/DeviceCMYK':
mode = "CMYK"
if '/Filter' in xObject[obj]:
if xObject[obj]['/Filter'] == '/FlateDecode':
img = Image.frombytes(mode, size, data)
cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.png"
img.save(filename=os.path.join(tmp_dir, cover_file_name))
return cover_file_name
# img.save(obj[1:] + ".png")
elif xObject[obj]['/Filter'] == '/DCTDecode':
cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.jpg"
img = open(cover_file_name, "wb")
img.write(data)
img.close()
# Post processing
img2 = Image.open(cover_file_name)
width, height = img2.size
if mode == 'CMYK':
img2 = CMYKInvert(img2)
img2 = img2.crop((box[0]/mediaBox[2]*width,
box[1]/mediaBox[3]*height,
box[2]/mediaBox[2]*width,
box[3]/mediaBox[3]*height))
img2.save(cover_file_name)
return cover_file_name
elif xObject[obj]['/Filter'] == '/JPXDecode':
cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.jp2"
img = open(cover_file_name, "wb")
img.write(data)
img.close()
# Post processing
img2 = Image.open(cover_file_name)
width, height = img2.size
if mode == 'CMYK':
img2 = CMYKInvert(img2)
img2 = img2.crop((box[0]/mediaBox[2]*width,
box[1]/mediaBox[3]*height,
box[2]/mediaBox[2]*width,
box[3]/mediaBox[3]*height))
img2.save(cover_file_name)
return cover_file_name
elif xObject[obj]['/Filter'] == '/CCITTFaxDecode':
if xObject[obj]['/DecodeParms']['/K'] == -1:
CCITT_group = 4
else:
CCITT_group = 3
width = xObject[obj]['/Width']
height = xObject[obj]['/Height']
img_size = len(data)
tiff_header = tiff_header_for_CCITT(width, height, img_size, CCITT_group)
cover_file_name_tiff = os.path.splitext(tmp_file_path)[0] + obj[1:] + '.tiff'
cover_file_name = os.path.splitext(tmp_file_path)[0] + obj[1:] + '.jpg'
img = open(cover_file_name_tiff, "wb")
img.write(tiff_header + data)
img.close()
# Post processing
img2 = Image.open(cover_file_name_tiff)
if img2.mode == '1':
img2 = ImageOps.invert(img2.convert('RGB'))
img2.save(cover_file_name)
return cover_file_name
else:
img = Image.frombytes(mode, size, data)
cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.png"
img.save(filename=os.path.join(tmp_dir, cover_file_name))
return cover_file_name
# img.save(obj[1:] + ".png")
except Exception as ex:
print(ex)
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:
log.warning('Pdf extraction forbidden by Imagemagick policy: %s', ex)
return None
except Exception as ex:
log.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'
if use_PIL:
PILVersion = 'v' + PILversion
else:
PILVersion = u'not installed'
if comic.use_comic_meta:
ComicVersion = u'installed'
else:
ComicVersion = u'not installed'
return {'Image Magick': IVersion,
'PyPdf': PVersion,
'lxml':XVersion,
'Wand': WVersion,
'Pillow': PILVersion,
'Comic_API': ComicVersion}
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