404-finder 1.0.6

an Abbot package for Microsoft Teams by Serious Business

Check all the links on a page to make sure they all resolve

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We built Abbot because we saw the power of this style of work (called ChatOps), when we worked at GitHub. ChatOps made it possible for GitHub to work productively without meetings, while globally distributed. We think it's a pretty great way to work, so we made it easy to use in Slack, Discord, and Microsoft Teams.

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# Description: Check all the links on a page to make sure they all resolve
#
# Package URL: https://ab.bot/packages/aseriousbiz/404-finder
#
# Usage:
# This skill is best used as a scheduled skill.
#
# @abbot schedule 404-finder

from bs4 import BeautifulSoup
from urllib.parse import urlparse
import requests

# Let's pretend to be Chrome in order to check Twitter 
bot_headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36'}

def check_link(url):
  if url.startswith("mailto:") or url.startswith("tel:"):
    return
  try:
    r = requests.head(url, headers=bot_headers)
    if r.status_code in [404, 500, 502, 503, 504]:
        bot.reply(":warning: {} returned status **{}**".format(url, r.status_code))
  
  except:
    bot.reply(":octagonal-sign: Could not reach `{}` while crawling `{}`".format(url, args))
    

def check_links(url):
  """Check any hyperlinks in the data and report any issues to chat."""
  try:
    r = requests.get(url, headers=bot_headers)
    r.raise_for_status()
    
    soup = BeautifulSoup(r.text, 'html.parser')
    links = soup.find_all('a', href=True)
    url_parts = urlparse(url)
    for link in links:
      target = link['href']
      if target[0] == "/" or target[0] == "#":
          target = "{}://{}{}".format(url_parts.scheme, url_parts.netloc, link['href'])
      check_link(target)
    bot.reply("Finished checking `{}` for 404s".format(url))
  except ConnectionError:
    bot.reply("Error checking for 404s. Could not reach `{}`.".format(url))

if len(bot.arguments) > 0:
  check_links(bot.arguments)
else:
  bot.reply("You didn't say anything")

Version	Created	Author	Release Notes	Installs
1.0.6	11/2/2021	Paul	Handle situations where a domain is not resolving at all.	0
1.0.5	8/4/2021	Paul	Better messages	0
1.0.4	8/4/2021	Paul	Better handle non-root website URLs	0
1.0.3	8/3/2021	Paul	Ignore `tel` links since a browser can't try to navigate to them.	1
1.0.2	6/5/2021	Paul	Only report specific errors: Not Found, 50x Server Error (was previously reporting authentication and redirection errors as warnings incorrectly)	1
1.0.1	6/4/2021	Paul	Handle relative URLs correctly	0
1.0.0	2/13/2021	Paul	First release!	3

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Details

Last updated: Tuesday, 02 November 2021 17:11
Installs: 5 total installs
Language: Python
License: MIT License

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