forked from forks/microblog.pub
63 lines
1.7 KiB
Python
63 lines
1.7 KiB
Python
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from urllib.parse import urlparse
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import httpx
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from bs4 import BeautifulSoup # type: ignore
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from loguru import logger
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from app import config
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from app.utils.url import is_url_valid
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def _make_abs(url: str | None, parent: str) -> str | None:
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if url is None:
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return None
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if url.startswith("http"):
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return url
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return (
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urlparse(parent)._replace(path=url, params="", query="", fragment="").geturl()
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)
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async def _discover_webmention_endoint(url: str) -> str | None:
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async with httpx.AsyncClient() as client:
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try:
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resp = await client.get(
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url,
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headers={
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"User-Agent": config.USER_AGENT,
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},
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follow_redirects=True,
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)
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resp.raise_for_status()
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except (httpx.HTTPError, httpx.HTTPStatusError):
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logger.exception(f"Failed to discover webmention endpoint for {url}")
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return None
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for k, v in resp.links.items():
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if k and "webmention" in k:
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return _make_abs(resp.links[k].get("url"), url)
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soup = BeautifulSoup(resp.text, "html5lib")
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wlinks = soup.find_all(["link", "a"], attrs={"rel": "webmention"})
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for wlink in wlinks:
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if "href" in wlink.attrs:
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return _make_abs(wlink.attrs["href"], url)
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return None
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async def discover_webmention_endpoint(url: str) -> str | None:
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"""Discover the Webmention endpoint of a given URL, if any.
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Passes all the tests at https://webmention.rocks!
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"""
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wurl = await _discover_webmention_endoint(url)
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if wurl is None:
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return None
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if not is_url_valid(wurl):
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return None
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return wurl
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