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40 lines
1.3 KiB
Python
40 lines
1.3 KiB
Python
from typing import Mapping, Union
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from bs4 import BeautifulSoup
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from django.http import HttpRequest
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from django.utils.html import escape
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from zerver.lib.cache import cache_with_key, open_graph_description_cache_key
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def html_to_text(content: Union[str, bytes], tags: Mapping[str, str] = {"p": " | "}) -> str:
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bs = BeautifulSoup(content, features="lxml")
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# Skip any admonition (warning) blocks, since they're
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# usually something about users needing to be an
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# organization administrator, and not useful for
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# describing the page.
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for tag in bs.find_all("div", class_="admonition"):
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tag.clear()
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# Skip code-sections, which just contains navigation instructions.
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for tag in bs.find_all("div", class_="code-section"):
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tag.clear()
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text = ""
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for element in bs.find_all(tags.keys()):
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# Ignore empty elements
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if not element.text:
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continue
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# .text converts it from HTML to text
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if text:
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text += tags[element.name]
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text += element.text
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if len(text) > 500:
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break
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return escape(" ".join(text.split()))
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@cache_with_key(open_graph_description_cache_key, timeout=3600 * 24)
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def get_content_description(content: bytes, request: HttpRequest) -> str:
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return html_to_text(content)
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