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import re
import sys
import urllib.parse
from bs4 import BeautifulSoup
RESEARCHSQUARE_REGEX = re.compile(r'"url":"(https://assets.researchsquare.com/files/.{1,50}/v\d+/Manuscript.pdf)"')
def extract_fulltext_url(html_url, html_body):
"""
Takes an HTML document (and URL), assumed to be a landing page, and tries
to find a fulltext PDF url.
"""
host_prefix = '/'.join(html_url.split('/')[:3])
soup = BeautifulSoup(html_body, 'html.parser')
### General Tricks ###
# highwire-style meta tag
meta = soup.find('meta', attrs={"name":"citation_pdf_url"})
if not meta:
meta = soup.find('meta', attrs={"name":"bepress_citation_pdf_url"})
if meta:
url = meta['content'].strip()
if url.startswith('http'):
return dict(pdf_url=url, technique='citation_pdf_url')
else:
sys.stderr.write("malformed citation_pdf_url? {}\n".format(url))
# ACS (and probably others) like:
# https://pubs.acs.org/doi/10.1021/acs.estlett.9b00379
# <a href="/doi/pdf/10.1021/acs.estlett.9b00379" title="PDF" target="_blank" class="button_primary"><i class="icon-file-pdf-o"></i><span>PDF (1 MB)</span></a>
href = soup.find('a', attrs={"title":"PDF"})
if href:
url = href['href'].strip()
if url.startswith('http'):
return dict(pdf_url=url, technique='href_title')
elif url.startswith('/'):
return dict(pdf_url=host_prefix+url, technique='href_title')
### Publisher/Platform Specific ###
# eLife (elifesciences.org)
if '://elifesciences.org/articles/' in html_url:
anchor = soup.find("a", attrs={"data-download-type": "pdf-article"})
if anchor:
url = anchor['href'].strip()
assert '.pdf' in url
return dict(pdf_url=url)
# research square (researchsquare.com)
if 'researchsquare.com/article/' in html_url:
# JSON in body with a field like:
# "url":"https://assets.researchsquare.com/files/4a57970e-b002-4608-b507-b95967649483/v2/Manuscript.pdf"
m = RESEARCHSQUARE_REGEX.search(html_body.decode('utf-8'))
if m:
url = m.group(1)
assert len(url) < 1024
return dict(release_stage="manuscript", pdf_url=url)
# ehp.niehs.nih.gov
# <a href="/doi/pdf/10.1289/EHP3950">
if '://linkinghub.elsevier.com/retrieve/pii/' in html_url:
redirect = soup.find("input", attrs={"name": "redirectURL"})
if redirect:
url = redirect['value'].strip()
if 'sciencedirect.com' in url:
url = urllib.parse.unquote(url)
return dict(next_url=url)
return dict()
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