mirror of https://git.sr.ht/~tsileo/microblog.pub
95 lines
2.8 KiB
Python
95 lines
2.8 KiB
Python
from typing import Any
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from urllib.parse import urlparse
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import httpx
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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 check_url
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async def webfinger(
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resource: str,
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) -> dict[str, Any] | None: # noqa: C901
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"""Mastodon-like WebFinger resolution to retrieve the activity stream Actor URL."""
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logger.info(f"performing webfinger resolution for {resource}")
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protos = ["https", "http"]
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if resource.startswith("http://"):
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protos.reverse()
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host = urlparse(resource).netloc
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elif resource.startswith("https://"):
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host = urlparse(resource).netloc
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else:
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if resource.startswith("acct:"):
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resource = resource[5:]
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if resource.startswith("@"):
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resource = resource[1:]
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_, host = resource.split("@", 1)
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resource = "acct:" + resource
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is_404 = False
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resp: httpx.Response | None = None
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async with httpx.AsyncClient() as client:
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for i, proto in enumerate(protos):
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try:
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url = f"{proto}://{host}/.well-known/webfinger"
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check_url(url)
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resp = await client.get(
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url,
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params={"resource": resource},
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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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break
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except httpx.HTTPStatusError as http_error:
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logger.exception("HTTP error")
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if http_error.response.status_code in [403, 404, 410]:
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is_404 = True
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continue
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raise
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except httpx.HTTPError:
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logger.exception("req failed")
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# If we tried https first and the domain is "http only"
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if i == 0:
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continue
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break
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if is_404:
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return None
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if resp:
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return resp.json()
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else:
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return None
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async def get_remote_follow_template(resource: str) -> str | None:
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data = await webfinger(resource)
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if data is None:
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return None
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for link in data["links"]:
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if link.get("rel") == "http://ostatus.org/schema/1.0/subscribe":
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return link.get("template")
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return None
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async def get_actor_url(resource: str) -> str | None:
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"""Mastodon-like WebFinger resolution to retrieve the activity stream Actor URL.
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Returns:
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the Actor URL or None if the resolution failed.
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"""
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data = await webfinger(resource)
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if data is None:
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return None
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for link in data["links"]:
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if (
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link.get("rel") == "self"
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and link.get("type") == "application/activity+json"
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):
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return link.get("href")
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return None
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