47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
import json
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import little_boxes.activitypub as ap
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import mf2py
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import requests
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from little_boxes.errors import NotAnActivityError
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from little_boxes.webfinger import get_actor_url
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def lookup(url: str) -> ap.BaseActivity:
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"""Try to find an AP object related to the given URL."""
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try:
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if url.startswith("@"):
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actor_url = get_actor_url(url)
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if actor_url:
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return ap.fetch_remote_activity(actor_url)
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except NotAnActivityError:
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pass
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except requests.HTTPError:
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# Some websites may returns 404, 503 or others when they don't support webfinger, and we're just taking a guess
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# when performing the lookup.
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pass
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backend = ap.get_backend()
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resp = requests.get(
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url,
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timeout=15,
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allow_redirects=False,
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headers={"User-Agent": backend.user_agent()},
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)
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resp.raise_for_status()
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# If the page is HTML, maybe it contains an alternate link pointing to an AP object
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for alternate in mf2py.parse(resp.text).get("alternates", []):
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if alternate.get("type") == "application/activity+json":
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return ap.fetch_remote_activity(alternate["url"])
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try:
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# Maybe the page was JSON-LD?
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data = resp.json()
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return ap.parse_activity(data)
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except json.JSONDecodeError:
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pass
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# Try content negotiation (retry with the AP Accept header)
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return ap.fetch_remote_activity(url)
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