microblog.pub/utils/lookup.py

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