326 lines
10 KiB
Python
326 lines
10 KiB
Python
# -*- coding: utf-8 -*-
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import sys
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import tempfile
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import subprocess
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import os
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import shutil
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from glob import glob
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from datetime import datetime
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from PyPDF2 import PdfFileReader
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from PIL import Image
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import ox
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import settings
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from utils import get_language, to_isbn13, find_isbns, get_short_path_name
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import logging
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logger = logging.getLogger(__name__)
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def cover(pdf):
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if sys.platform == 'darwin':
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return ql_cover(pdf)
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else:
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return page(pdf, 1)
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def ql_cover(pdf, size=1024):
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tmp = tempfile.mkdtemp()
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cmd = [
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'qlmanage',
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'-t',
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'-s',
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str(size),
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'-o',
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tmp,
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pdf
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]
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p = subprocess.Popen(cmd, close_fds=True)
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p.wait()
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image = glob('%s/*' % tmp)
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if image:
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image = image[0]
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with open(image, 'rb') as fd:
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data = fd.read()
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else:
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logger.debug('qlmanage did not create cover for %s', pdf)
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data = None
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shutil.rmtree(tmp)
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return data
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def page(pdf, page, size=1024):
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tmp = tempfile.mkdtemp()
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if sys.platform == 'win32':
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pdf = get_short_path_name(pdf)
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cmd = [
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'pdftocairo',
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pdf,
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'-jpeg',
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'-f', str(page), '-l', str(page),
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'-scale-to', str(size), '-cropbox',
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os.path.join(tmp, 'page')
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]
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if sys.platform == 'win32':
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startupinfo = subprocess.STARTUPINFO()
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startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
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startupinfo.wShowWindow = subprocess.SW_HIDE
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p = subprocess.Popen(cmd, close_fds=True, startupinfo=startupinfo)
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else:
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p = subprocess.Popen(cmd, close_fds=True)
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p.wait()
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image = glob('%s/*' % tmp)
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if image:
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image = image[0]
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with open(image, 'rb') as fd:
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data = fd.read()
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else:
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logger.debug('pdftocairo %s %s', pdf, ' '.join(cmd))
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data = None
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shutil.rmtree(tmp)
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return data
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def crop(pdf, page, left, top, right, bottom):
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size = 2048
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tmp = tempfile.mkdtemp()
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if sys.platform == 'win32':
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pdf = get_short_path_name(pdf)
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cmd = [
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'pdftocairo',
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pdf,
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'-jpeg',
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'-f', str(page), '-l', str(page),
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'-scale-to', str(size), '-cropbox',
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os.path.join(tmp, 'page')
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]
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if sys.platform == 'win32':
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startupinfo = subprocess.STARTUPINFO()
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startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
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startupinfo.wShowWindow = subprocess.SW_HIDE
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p = subprocess.Popen(cmd, close_fds=True, startupinfo=startupinfo)
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else:
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p = subprocess.Popen(cmd, close_fds=True)
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p.wait()
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image = glob('%s/*' % tmp)
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if image:
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image = image[0]
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crop = [int(p) for p in (left, top, right, bottom)]
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print(crop)
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img = Image.open(image).crop(crop)
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img.save(image)
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with open(image, 'rb') as fd:
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data = fd.read()
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else:
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logger.debug('pdftocairo %s %s', pdf, ' '.join(cmd))
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data = None
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shutil.rmtree(tmp)
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return data
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'''
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def page(pdf, page):
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image = tempfile.mkstemp('.jpg')[1]
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cmd = [
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'gs', '-q',
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'-dBATCH', '-dSAFER', '-dNOPAUSE', '-dNOPROMPT',
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'-dMaxBitmap=500000000',
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'-dAlignToPixels=0', '-dGridFitTT=2',
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'-sDEVICE=jpeg', '-dTextAlphaBits=4', '-dGraphicsAlphaBits=4',
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'-r72',
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'-dUseCropBox',
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'-dFirstPage=%d' % page,
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'-dLastPage=%d' % page,
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'-sOutputFile=%s' % image,
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pdf
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]
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p = subprocess.Popen(cmd, close_fds=True)
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p.wait()
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with open(image, 'rb') as fd:
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data = fd.read()
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os.unlink(image)
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return data
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'''
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def parse_tableofcontents(reader):
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titles = []
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try:
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if '/Root' in reader.trailer and '/Outlines' in reader.trailer['/Root']:
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outlines = reader.trailer['/Root']['/Outlines']
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if '/First' in outlines:
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title = outlines['/First']
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while title:
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if '/Title' in title:
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titles.append(title['/Title'])
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if '/Next' in title:
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title = title['/Next']
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else:
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title = None
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except:
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logger.debug('failed to parse pdf outline', exc_info=True)
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try:
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titles = [title.decode('utf-8','ignore').strip() if isinstance(title, bytes) else title for title in titles]
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toc = '\n'.join(titles).strip()
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except:
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logger.debug('failed to decode outline', exc_info=True)
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titles = []
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return toc
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def info(pdf):
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data = {}
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with open(pdf, 'rb') as fd:
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try:
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pdfreader = PdfFileReader(fd)
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data['pages'] = pdfreader.numPages
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if pdfreader.getIsEncrypted():
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pdfreader.decrypt('')
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toc = parse_tableofcontents(pdfreader)
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if toc:
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data['tableofcontents'] = toc
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try:
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info = pdfreader.getDocumentInfo()
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except:
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info = None
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if info:
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for key in info:
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if info[key]:
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try:
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value = info[key]
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if len(value) == 1:
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value = value[0]
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if isinstance(value, bytes):
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value = value.decode('utf-16')
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data[key[1:].lower()] = value
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except:
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pass
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try:
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xmp = pdfreader.getXmpMetadata()
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except:
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xmp = None
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if xmp:
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for key in dir(xmp):
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if key.startswith('dc_'):
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try:
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value = getattr(xmp, key)
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except:
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continue
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if isinstance(value, dict) and 'x-default' in value:
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value = value['x-default']
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elif isinstance(value, list):
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value = [v.strip() if isinstance(v, str) else v for v in value if v]
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value = [v.strftime('%Y-%m-%d') if isinstance(v, datetime) else v for v in value]
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if len(value) == 1:
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value = value[0]
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_key = key[3:]
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if value and _key not in data:
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data[_key] = value
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except:
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logger.debug('FAILED TO PARSE %s', pdf, exc_info=True)
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'''
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cmd = ['pdfinfo', pdf]
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdout, stderr = p.communicate()
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for line in stdout.strip().split('\n'):
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parts = line.split(':')
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key = parts[0].lower().strip()
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if key:
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data[key] = ':'.join(parts[1:]).strip()
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for key in data.keys():
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if not data[key]:
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del data[key]
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'''
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if 'identifier' in data:
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value = to_isbn13(data['identifier'])
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if value:
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data['isbn'] = value
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del data['identifier']
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for key, value in data.items():
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if isinstance(value, dict):
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value = ' '.join(list(value.values()))
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data[key] = value.strip()
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for key in list(data):
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if data[key] in ('Unknown',):
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del data[key]
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if key == 'language':
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data[key] = get_language(data[key])
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if settings.server['extract_text']:
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text = extract_text(pdf)
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data['textsize'] = len(text)
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if 'isbn' not in data:
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isbn = extract_isbn(text)
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if isbn:
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data['isbn'] = isbn
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if 'date' in data and len(data['date']) == 8 and data['date'].isdigit():
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d = data['date']
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data['date'] = '%s-%s-%s' % (d[:4], d[4:6], d[6:])
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if 'author' in data and isinstance(data['author'], str):
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data['author'] = [ox.normalize_name(data['author'])]
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if 'description' in data:
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data['description'] = ox.strip_tags(ox.decode_html(data['description'])).strip()
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if data.get('title', '').startswith('Microsoft Word'):
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for key in ('title', 'author', 'producer', 'creator'):
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if key in data:
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del data[key]
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for key in list(data):
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if isinstance(data[key], str) and not data[key].strip():
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del data[key]
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return data
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'''
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#possbile alternative with gs
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tmp = tempfile.mkstemp('.txt')[1]
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cmd = ['gs', '-dBATCH', '-dNOPAUSE', '-sDEVICE=txtwrite', '-dFirstPage=3', '-dLastPage=5', '-sOutputFile=%s'%tmp, pdf]
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'''
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def extract_text(pdf):
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if sys.platform == 'win32':
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pdf = get_short_path_name(pdf)
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cmd = ['pdftotext', pdf, '-']
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if sys.platform == 'darwin':
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pdftotext = ['/usr/local/bin/pdftotext', pdf, '-']
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if os.path.exists(pdftotext[0]):
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cmd = pdftotext
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else:
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cmd = ['/usr/bin/mdimport', '-d2', pdf]
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if sys.platform == 'win32':
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startupinfo = subprocess.STARTUPINFO()
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startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
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startupinfo.wShowWindow = subprocess.SW_HIDE
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, startupinfo=startupinfo)
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else:
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdout, stderr = p.communicate()
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stdout = stdout.decode()
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stderr = stderr.decode()
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if sys.platform == 'darwin' and cmd[0] == '/usr/bin/mdimport':
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if 'kMDItemTextContent' in stderr:
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stdout = stderr.split('kMDItemTextContent = "')[-1].split('\n')[0][:-2]
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else:
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stdout = ''
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return stdout.strip()
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def pypdf_extract_text(path):
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'''
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slow and bad results
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'''
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pdf = PdfFileReader(path)
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content = []
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for i in range(0, pdf.getNumPages()):
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try:
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extracted_text = pdf.getPage(i).extractText()
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content.append(extracted_text)
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except:
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pass
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content = "\n".join(content).replace("\xa0", " ").strip()
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return content
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def extract_isbn(text):
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isbns = find_isbns(text)
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if isbns:
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return isbns[0]
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