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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)"')
IEEEXPLORE_REGEX = re.compile(r'"pdfPath":"(/.*?\.pdf)"')
OVID_JOURNAL_URL_REGEX = re.compile(r'journalURL = "(http.*)";')
def test_regex():
lines = """
blah
var journalURL = "https://journals.lww.com/co-urology/fulltext/10.1097/MOU.0000000000000689";
asdf"""
m = OVID_JOURNAL_URL_REGEX.search(lines)
assert m.group(1) == "https://journals.lww.com/co-urology/fulltext/10.1097/MOU.0000000000000689"
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"})
# wiley has a weird almost-blank page we don't want to loop on
if meta and not "://onlinelibrary.wiley.com/doi/pdf/" in html_url:
url = meta['content'].strip()
if url.startswith('/'):
return dict(pdf_url=host_prefix+url, technique='citation_pdf_url')
elif url.startswith('http'):
return dict(pdf_url=url, technique='citation_pdf_url')
else:
print("malformed citation_pdf_url? {}".format(url), file=sys.stderr)
# sage, and also utpjournals (see below)
# https://journals.sagepub.com/doi/10.1177/2309499019888836
# <a href="http://journals.sagepub.com/doi/pdf/10.1177/2309499019888836" class="show-pdf" target="_self">
# <a href="http://utpjournals.press/doi/pdf/10.3138/cjh.ach.54.1-2.05" class="show-pdf" target="_blank">
href = soup.find('a', attrs={"class":"show-pdf"})
if href:
url = href['href'].strip()
if url.startswith('http'):
return dict(pdf_url=url, technique='href_show-pdf')
# 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')
# http://www.jasstudies.com/DergiTamDetay.aspx?ID=3401
# <embed src="/files/jass_makaleler/1359848334_33-Okt.%20Yasemin%20KARADEM%C4%B0R.pdf" type="application/pdf" />
embed = soup.find('embed', attrs={"type": "application/pdf"})
if embed:
url = embed['src'].strip()
if url.startswith('/'):
url = host_prefix+url
if url.startswith('http'):
return dict(pdf_url=url, technique='embed_type')
### 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, technique='publisher')
# 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, technique='publisher')
# elseiver linking hub
# https://linkinghub.elsevier.com/retrieve/pii/S1569199319308975
if '://linkinghub.elsevier.com/retrieve/pii/' in html_url:
# <input type="hidden" name="redirectURL" value="http%3A%2F%2Fcysticfibrosisjournal.com%2Fretrieve%2Fpii%2FS1569199319308975" id="redirectURL"/>
redirect = soup.find("input", attrs={"name": "redirectURL"})
if redirect:
url = redirect['value'].strip()
if 'http' in url:
url = urllib.parse.unquote(url)
# drop any the query parameter
url = url.split('?via')[0]
return dict(next_url=url, technique="elsevier-linkinghub")
# ieeexplore.ieee.org
# https://ieeexplore.ieee.org/document/8730316
if '://ieeexplore.ieee.org/document/' in html_url:
# JSON in body with a field like:
# "pdfPath":"/iel7/6287639/8600701/08730316.pdf",
m = IEEEXPLORE_REGEX.search(html_body.decode('utf-8'))
if m:
url = m.group(1)
assert len(url) < 1024
return dict(release_stage="published", pdf_url=host_prefix+url, technique="publisher")
# https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=8730313
if '://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber' in html_url:
# HTML iframe like:
# <iframe src="http://web.archive.org/web/20191026011528if_/https://ieeexplore.ieee.org/ielx7/6287639/8600701/08730313.pdf?tp=&arnumber=8730313&isnumber=8600701&ref=" frameborder="0"></iframe>
iframe = soup.find("iframe")
if iframe and '.pdf' in iframe['src']:
return dict(pdf_url=iframe['src'], technique="iframe")
# utpjournals.press
# https://utpjournals.press/doi/10.3138/cjh.ach.54.1-2.05
if '://utpjournals.press/doi/10.' in html_url:
# <a href="http://utpjournals.press/doi/pdf/10.3138/cjh.ach.54.1-2.05" class="show-pdf" target="_blank">
href = soup.find('a', attrs={"class":"show-pdf"})
if href:
url = href['href'].strip()
if url.startswith('http'):
return dict(pdf_url=url, technique='publisher-href')
# https://www.jcancer.org/v10p4038.htm
# simple journal-specific href
if '://www.jcancer.org/' in html_url and html_url.endswith(".htm"):
# <a href='v10p4038.pdf' class='textbutton'>PDF</a>
href = soup.find('a', attrs={"class":"textbutton"})
if href:
url = href['href'].strip()
if url.endswith(".pdf") and not "http" in url:
return dict(pdf_url=host_prefix+"/"+url, technique='journal-href')
# https://insights.ovid.com/crossref?an=00042307-202001000-00013
# Ovid is some kind of landing page bounce portal tracking run-around.
# Can extract actual journal URL from javascript blob in the HTML
if '://insights.ovid.com/crossref' in html_url:
# var journalURL = "https://journals.lww.com/co-urology/fulltext/10.1097/MOU.0000000000000689";
m = OVID_JOURNAL_URL_REGEX.search(html_body.decode('utf-8'))
if m:
url = m.group(1)
assert len(url) < 1024
return dict(next_url=url, technique='ovid')
# osf.io
# https://osf.io/8phvx/
# https://osf.io/preprints/socarxiv/8phvx/
# wow, they ship total javascript crud! going to just guess download URL
# based on URL for now. Maybe content type header would help?
if '://osf.io/' in html_url and not '/download' in html_url:
if not html_url.endswith("/"):
next_url = html_url+"/download"
else:
next_url = html_url+"download"
return dict(next_url=next_url, technique='osf-by-url')
# wiley
# https://onlinelibrary.wiley.com/doi/pdf/10.1111/1467-923X.12787
if "://onlinelibrary.wiley.com/doi/pdf/" in html_url:
if "/doi/pdfdirect/" in html_body:
next_url = html_url.replace('/doi/pdf/', '/doi/pdfdirect/')
return dict(next_url=next_url, technique='wiley-pdfdirect')
# taylor and frances
# https://www.tandfonline.com/doi/full/10.1080/19491247.2019.1682234
# <a href="/doi/pdf/10.1080/19491247.2019.1682234?needAccess=true" class="show-pdf" target="_blank">
if "://www.tandfonline.com/doi/full/10." in html_url:
href = soup.find('a', attrs={"class":"show-pdf"})
if href:
url = href['href'].strip()
if "/pdf/" in url:
return dict(pdf_url=host_prefix+url, technique='publisher')
return dict()
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