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75 lines
2.2 KiB
Python
75 lines
2.2 KiB
Python
import logging
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from typing import Any
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from typing import Dict
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from typing import Optional
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from urllib.parse import urlparse
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import requests
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from .urlutils import check_url
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logger = logging.getLogger(__name__)
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def webfinger(resource: str) -> Optional[Dict[str, Any]]:
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"""Mastodon-like WebFinger resolution to retrieve the activity stream Actor URL.
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"""
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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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# Security check on the url (like not calling localhost)
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check_url(f'https://{host}')
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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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resp = requests.get(
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url,
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{'resource': resource}
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)
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except requests.ConnectionError:
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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 resp.status_code == 404:
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return None
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resp.raise_for_status()
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return resp.json()
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def get_remote_follow_template(resource: str) -> Optional[str]:
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data = 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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def get_actor_url(resource: str) -> Optional[str]:
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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 = 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') == 'self' and link.get('type') == 'application/activity+json':
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return link.get('href')
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return None
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