Tuesday, June 25, 2024
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Changing from bleach to nh3


Bleach is deprecated, here is methods to come near replicating bleach.clear() utilizing the nh3 model of .clear().

import nh3

def clean_string(string: str) -> str:
    
    
    return nh3.clear(
        string,
        tags={
            "a",
            "abbr",
            "acronym",
            "b",
            "blockquote",
            "code",
            "em",
            "i",
            "li",
            "ol",
            "robust",
            "ul",
        },
        attributes={
            "a": {"href", "title"},
            "abbr": {"title"},
            "acronym": {"title"},
        },
        url_schemes={"http", "https", "mailto"},
        link_rel=None,
    )

The massive distinction is not like the safing of HTML executed by bleach, nh3 removes the offending tags altogether. Learn the feedback beneath to see what this implies.

Outcomes:

>>> input_from_user = """<b>
<img src="">
I am not attempting to XSS you <a href="https://instance.com">Hyperlink</a>
</b>"""
>>>
>>> 
>>> 
>>> bleach.clear(input_from_user)
'<b>&lt;img src=""&gt;I am not attempting to XSS you <a href="https://instance.com">Hyperlink</a></b>'
>>>
>>> 
>>> 
>>> clean_string(input_from_user)
'<b>nnI'm not attempting to XSS you <a href="https://instance.com">Hyperlink</a>n</b>'

Benefits of switching to nh3 are:

  1. nh3 is actively maintained, bleach is formally deprecated.
  2. I consider the nh3 strategy of stripping tags relatively than permitting safing is safer. The concept of safing is nice, however I’ve all the time puzzled if a artistic attacker might discover a technique to exploit it. So I believe it’s higher to take away the offending tags altogether.
  3. The preservation of whitespace is actually helpful for preserving content material submitted in a textarea. That is very true for Markdown content material.
  4. nh3 is a binding to the rust-ammonia mission. They declare a 15x pace enhance over bleach’s binding to the html5lib mission. Even when that could be a 3x exaggeration, that is nonetheless a 5x pace enhance.
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