53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
import bleach
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from bleach.linkifier import LinkifyFilter
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from django.utils.safestring import mark_safe
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def allow_a(tag: str, name: str, value: str):
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if name in ["href", "title", "class"]:
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return True
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elif name == "rel":
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# Only allow rel attributes with a small subset of values
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# (we're defending against, for example, rel=me)
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rel_values = value.split()
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if all(v in ["nofollow", "noopener", "noreferrer", "tag"] for v in rel_values):
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return True
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return False
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def sanitize_post(post_html: str) -> str:
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"""
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Only allows a, br, p and span tags, and class attributes.
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"""
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cleaner = bleach.Cleaner(
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tags=["br", "p"],
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attributes={ # type:ignore
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"a": allow_a,
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"p": ["class"],
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"span": ["class"],
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},
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filters=[LinkifyFilter],
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strip=True,
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)
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return mark_safe(cleaner.clean(post_html))
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def strip_html(post_html: str) -> str:
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"""
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Strips all tags from the text, then linkifies it.
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"""
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cleaner = bleach.Cleaner(tags=[], strip=True, filters=[LinkifyFilter])
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return mark_safe(cleaner.clean(post_html))
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def html_to_plaintext(post_html: str) -> str:
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"""
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Tries to do the inverse of the linebreaks filter.
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"""
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# TODO: Handle HTML entities
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# Remove all newlines, then replace br with a newline and /p with two (one comes from bleach)
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post_html = post_html.replace("\n", "").replace("<br>", "\n").replace("</p>", "\n")
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# Remove all other HTML and return
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cleaner = bleach.Cleaner(tags=[], strip=True, filters=[])
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return cleaner.clean(post_html).strip()
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