`url(public = True)` is broken

[haavardw]

Version 0.10.3 added the public argument to validators.url which would return 'False' for obvious local urls. This was very useful, but the functionality seems to be broken, maybe since c43826c0dab6d23162b0564c448a31469331b16e . Even the tests are removed. Nothing is mentioned in the changelog, and I find no obvious workarounds...

[yozachar]

Hi @haavardw, can you please provide a couple of use cases to consider?

[haavardw]

We have a system where you can submit a URL and get the web-site analyzed and scanned for phishing, malware etc. The argument public=True is used to prevent scanning of local resources, e.g. file:///etc/passwd or local cloud resources, which would open up for an attack on our servers. We are currently using 0.18.2 but would like to upgrade.

[stratigos]

This article from Snyk is also apparently SEO optimized to appear for search results regarding python and URL validation: https://snyk.io/blog/secure-python-url-validation/

The code presented is essentially flawed as validators believes the local URL is valid, and only fails due to an invalid kwarg, public.

validation = validators.url("https://10.0.0.1", public=True)

if validation:

print("URL is valid")

else:

print("URL is invalid")

I read the source, and a comment in the source code suggests that public is a parameter, though the arg does not appear in the code.

I came to GitHub to search for a commit or perhaps issues that describe when/why public was removed.

Just mentioning this in case others find themselves here for the same reasons.

@haavardw you may be able to limit protocols or first check the url uses http | https explicitly before validation. Additionally it appears like file:///etc/passwd would be seen as an invalid url by validators.

[yozachar]

precedes #325