225 lines
7.9 KiB
Python
Executable File
225 lines
7.9 KiB
Python
Executable File
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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from urllib.request import build_opener, HTTPCookieProcessor, HTTPSHandler, Request
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from urllib.error import URLError, HTTPError
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from os.path import relpath
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from collections import deque
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import sys
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from time import sleep
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import ssl
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from io import BytesIO
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try:
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from bs4 import BeautifulSoup
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import html5lib
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import certifi
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except ImportError:
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print("Please install the BeautifulSoup, html5lib, and certifi libraries using `pip install bs4 html5lib certifi`.\n")
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raise
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if [int(v) for v in certifi.__version__.split('.')] < [2021, 5, 30]:
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print("Please upgrade certifi using `pip install --upgrade certifi`.\n")
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sys.exit(1)
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def get_links_and_destinations_from_pdf(f):
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try:
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from PyPDF2 import PdfFileReader
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except ImportError:
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print("Please install the PyPDF2 library using `pip install PyPDF2`.\n")
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raise
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# Based on <https://stackoverflow.com/a/5978161/393146>
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pdf = PdfFileReader(f)
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links = set()
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for pg in range(pdf.getNumPages()):
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obj = pdf.getPage(pg).getObject()
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for annotation in obj.get('/Annots', []):
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uri = annotation.getObject().get('/A', {}).get('/URI', None)
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if uri is not None and uri not in links:
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links.add(uri)
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dests = pdf.getNamedDestinations().keys()
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return (links, dests)
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def get_links_and_destinations_from_html(f):
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links = set()
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internal = set()
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dests = set()
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soup = BeautifulSoup(f.read(), "html5lib")
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for link in soup.find_all('a'):
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if link.has_attr('href'):
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url = link['href']
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(internal if url.startswith('#') else links).add(url)
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if link.has_attr('name'):
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dests.add(link['name'])
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for link in soup.find_all(id=True):
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dests.add(link['id'])
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# GitHub's rendering of .mediawiki files puts 'id="user-content-<ANCHOR>"' in the source
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# and dynamically creates a corresponding link #<ANCHOR>.
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if link['id'].startswith("user-content-"):
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dests.add(link['id'][13:])
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internal.difference_update(['#' + d for d in dests]) # ignore internal links satisfied by a dest
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links.update(internal)
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return (links, dests)
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def main(args):
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if len(args) < 2:
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print("Usage: ./links_and_dests.py [--check] [--print-dests] <file.pdf|html|xhtml>")
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return 1
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check = '--check' in args[1:]
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print_dests = '--print-dests' in args[1:]
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paths = [arg for arg in args[1:] if not arg.startswith('--')]
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all_links = {} # url -> pdf_paths
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all_dests = {} # url -> dests
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errors = deque()
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print("Reading files...")
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for path in paths:
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print(path, end=" ")
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sys.stdout.flush()
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with open(path, 'rb') as f:
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if path.endswith(".html") or path.endswith(".xhtml"):
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(links, dests) = get_links_and_destinations_from_html(f)
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elif path.endswith(".pdf"):
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(links, dests) = get_links_and_destinations_from_pdf(f)
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else:
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errors.append("Unrecognized file type: " + path)
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continue
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path = relpath(path)
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for l in links:
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refs = all_links.get(l, None)
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if refs is None:
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all_links[l] = refs = deque()
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refs.append(path)
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all_dests["https://zips.z.cash/" + path] = dests
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if path.endswith(".html"):
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all_dests["https://zips.z.cash/" + path[:-5]] = dests
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print("\n")
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print("Links:")
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last_url = None
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content = None
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content_type = None
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dests = None
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for (l, p) in sorted(all_links.items()):
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print(l, end=" ")
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sys.stdout.flush()
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what = "%s (occurs in %s)" % (l, " and ".join(p)) if len(paths) > 1 else l
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status = ""
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if ":" not in l:
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l = "https://zips.z.cash/" + l
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if l.startswith("mailto:"):
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status = "(not checked)"
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elif l.startswith("https:") or l.startswith("HTTP:"): # use uppercase HTTP: for links with no https: equivalent
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(url, _, fragment) = l.partition("#")
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if url in all_dests:
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if fragment and fragment not in all_dests[url]:
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errors.append("Missing link target: " + what)
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status = "❌"
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else:
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status = "✓"
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elif check:
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# If url == last_url, there is no need to refetch content. This is an optimization when
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# checking URLs with the same site but different fragments (which will be sorted together).
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if url != last_url:
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headers = {"User-Agent": "Mozilla/5.0"}
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https_handler = HTTPSHandler(context=ssl.create_default_context(cafile=certifi.where()))
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# Some DOI links (i.e. to https://doi.org/) redirect to link.springer.com
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# in a way that requires cookies (booo!). We allow this for DOI links,
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# but for all other links we simulate a client that never sets cookies.
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if l.startswith("https://doi.org/"):
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opener = build_opener(HTTPCookieProcessor(), https_handler)
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else:
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opener = build_opener(https_handler)
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for retry in range(2):
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try:
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response = opener.open(Request(url=l, headers=headers))
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content_type = response.info().get_content_type()
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content = response.read()
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last_url = url
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except URLError as e:
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if retry == 0 and isinstance(e, HTTPError) and e.code == 429:
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try:
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delay = int(e.headers['Retry-After'], 10) + 1
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except Exception:
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delay = 60
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print("(waiting %ds due to rate limiting)" % (delay,), end=" ")
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sys.stdout.flush()
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sleep(delay)
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continue
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errors.append("Could not open link: %s due to %r" % (what, e))
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status = "❌"
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content_type = None
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content = None
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last_url = None
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dests = None
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break
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if content is not None:
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if fragment:
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if dests is None:
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if content_type in ('text/html', 'application/xhtml+xml'):
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(_, dests) = get_links_and_destinations_from_html(BytesIO(content))
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elif content_type == 'application/pdf':
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(_, dests) = get_links_and_destinations_from_pdf(BytesIO(content))
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if dests is None:
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print("(link target not checked)", end=" ")
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status = "✓"
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elif fragment not in dests:
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errors.append("Missing link target: " + what)
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status = "❌"
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else:
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status = "✓"
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else:
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status = "✓"
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else:
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errors.append("Insecure or unrecognized protocol in link: " + what)
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status = "❌"
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print(status)
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if print_dests:
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for (path, dests) in all_dests.items():
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if path + ".html" not in all_dests: # avoid duplication
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print("\nDestinations for %s:" % (path,))
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for d in dests:
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print(d)
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if errors:
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print("\nErrors:")
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for e in errors:
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print(e)
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return 0
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if __name__ == '__main__':
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sys.exit(main(sys.argv))
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