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91ade25ba3
These are available in Python ≥ 3.9. https://docs.python.org/3/library/stdtypes.html#str.removeprefix Signed-off-by: Anders Kaseorg <anders@zulip.com>
37 lines
1.1 KiB
Python
37 lines
1.1 KiB
Python
from typing import Any
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from xml.etree.ElementTree import Element
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import markdown
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from django.contrib.staticfiles.storage import staticfiles_storage
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from markdown.extensions import Extension
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from typing_extensions import override
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from zerver.lib.markdown.priorities import PREPROCESSOR_PRIORITIES
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class MarkdownStaticImagesGenerator(Extension):
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@override
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def extendMarkdown(self, md: markdown.Markdown) -> None:
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md.treeprocessors.register(
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StaticImageProcessor(md),
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"static_images",
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PREPROCESSOR_PRIORITIES["static_images"],
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)
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class StaticImageProcessor(markdown.treeprocessors.Treeprocessor):
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"""
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Rewrite img tags which refer to /static/ to use staticfiles
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"""
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@override
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def run(self, root: Element) -> None:
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for img in root.iter("img"):
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url = img.get("src")
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if url is not None and url.startswith("/static/"):
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img.set("src", staticfiles_storage.url(url.removeprefix("/static/")))
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def makeExtension(*args: Any, **kwargs: str) -> MarkdownStaticImagesGenerator:
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return MarkdownStaticImagesGenerator(*args, **kwargs)
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