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# Copyright (C) 2018 Robin Krahl <robin.krahl@ireas.org>
# SPDX-License-Identifier: MIT
import mimetypes
import re
import urllib.request
import bibtexparser
import pdftotext
import PyPDF2.pdf
PDF_INFO_DOI = '/doi'
def _extract_doi(filename):
with open(filename, 'rb') as f:
reader = PyPDF2.pdf.PdfFileReader(f)
if PDF_INFO_DOI in reader.documentInfo:
return reader.documentInfo[PDF_INFO_DOI]
with open(filename, 'rb') as f:
pdf = pdftotext.PDF(f)
if len(pdf):
text = pdf[0]
pattern = re.compile(r'\b(10\.\d{4,}(?:\.\d+)*/(?:(?!["&\'<>])\S)+)\b')
m = pattern.search(text)
if m:
return m.group(1)
return None
def _get_data_for_doi(doi):
url = 'http://dx.doi.org/{}'.format(doi)
headers = {'Accept': 'text/bibliography; style=bibtex'}
request = urllib.request.Request(url, headers=headers)
with urllib.request.urlopen(request) as response:
bibtex = response.read().decode('utf-8')
return bibtexparser.loads(bibtex)
def _handle_pdf(filename):
doi = _extract_doi(filename)
if not doi:
raise Exception('Could not extract a DOI from the PDF file')
return _get_data_for_doi(doi)
def get_bibtex_data(filename):
mtype, _ = mimetypes.guess_type(filename)
if mtype == 'application/pdf':
return _handle_pdf(filename)
raise Exception('Unsupported file type ' + str(mtype))
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