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Use beautifulsoup for HTML-sanitization #1327

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phorward opened this issue Nov 18, 2024 · 0 comments
Open

Use beautifulsoup for HTML-sanitization #1327

phorward opened this issue Nov 18, 2024 · 0 comments
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@ArneGudermann
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feature New feature or request refactoring Pull requests that refactor code but do not change its behavior. security For security related bugs

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@phorward
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This little example demonstrates how easy HTML sanitization might be with beautifulsoup:

from bs4 import BeautifulSoup

html_content = """
<html>
  <body>
    <h1 class="title" onclick="alert('bad')">Title</h1>
    <script>alert('This is malicious');</script>
    <p id="para1" style="color: red;">This is a paragraph.</p>
  </body>
</html>
"""

soup = BeautifulSoup(html_content, "html.parser")

# Remove specific tags
for tag in soup(["script", "style"]):
    tag.decompose()

# Sanitize attributes
allowed_attributes = {"p": ["id"], "h1": []}
for tag in soup.find_all(True):
    if tag.name in allowed_attributes:
        tag.attrs = {key: value for key, value in tag.attrs.items() if key in allowed_attributes[tag.name]}
    else:
        tag.attrs = {}  # Remove all attributes for tags not in the allowed list

print(soup.prettify())

We should consider this as part of #631
@phorward phorward added feature New feature or request security For security related bugs refactoring Pull requests that refactor code but do not change its behavior. labels Nov 18, 2024
@ArneGudermann ArneGudermann self-assigned this Nov 20, 2024
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@ArneGudermann ArneGudermann

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feature New feature or request refactoring Pull requests that refactor code but do not change its behavior. security For security related bugs
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@phorward @ArneGudermann