kopia lustrzana https://github.com/snarfed/bridgy-fed
200 wiersze
6.2 KiB
Python
200 wiersze
6.2 KiB
Python
"""Translates user ids, handles, and object ids between protocols.
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https://fed.brid.gy/docs#translate
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"""
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import logging
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import re
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from urllib.parse import urljoin, urlparse
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from flask import request
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from google.cloud.ndb.query import FilterNode, Query
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from oauth_dropins.webutil import util
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from common import subdomain_wrap, LOCAL_DOMAINS, PRIMARY_DOMAIN, SUPERDOMAIN
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import models
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logger = logging.getLogger(__name__)
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# Protocols to check User.copies and Object.copies before translating
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COPIES_PROTOCOLS = ('atproto', 'fake', 'other', 'nostr')
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# Web user domains whose AP actor ids are on fed.brid.gy, not web.brid.gy, for
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# historical compatibility. Loaded on first call to web_ap_subdomain().
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_FED_SUBDOMAIN_SITES = None
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def web_ap_base_domain(user_domain):
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"""Returns the full Bridgy Fed domain to user for a given Web user.
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Specifically, returns ``http://localhost/` if we're running locally,
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``https://fed.brid.gy/`` if the given Web user has ``ap_subdomain='fed'``,
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otherwise ``https://web.brid.gy/``.
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Args:
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user_domain (str)
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Returns:
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str:
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"""
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if request.host in LOCAL_DOMAINS:
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return request.host_url
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global _FED_SUBDOMAIN_SITES
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if _FED_SUBDOMAIN_SITES is None:
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_FED_SUBDOMAIN_SITES = {
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key.id() for key in Query('MagicKey',
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filters=FilterNode('ap_subdomain', '=', 'fed')
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).fetch(keys_only=True)
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}
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logger.info(f'Loaded {len(_FED_SUBDOMAIN_SITES)} fed subdomain Web users')
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subdomain = 'fed' if user_domain in _FED_SUBDOMAIN_SITES else 'web'
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return f'https://{subdomain}{SUPERDOMAIN}/'
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def translate_user_id(*, id, from_proto, to_proto):
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"""Translate a user id from one protocol to another.
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Args:
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id (str)
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from_proto (protocol.Protocol)
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to_proto (protocol.Protocol)
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Returns:
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str: the corresponding id in ``to_proto``
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"""
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assert id and from_proto and to_proto
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assert from_proto.owns_id(id) is not False or from_proto.LABEL == 'ui'
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parsed = urlparse(id)
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if from_proto.LABEL == 'web' and parsed.path.strip('/') == '':
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# home page; replace with domain
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id = parsed.netloc
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if from_proto == to_proto:
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return id
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# follow use_instead
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user = from_proto.get_by_id(id)
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if user:
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id = user.key.id()
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if from_proto.LABEL in COPIES_PROTOCOLS or to_proto.LABEL in COPIES_PROTOCOLS:
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if user:
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if copy := user.get_copy(to_proto):
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return copy
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if orig := models.get_original(id):
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if isinstance(orig, to_proto):
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return orig.key.id()
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match from_proto.LABEL, to_proto.LABEL:
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case _, 'atproto' | 'nostr':
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logger.warning(f"Can't translate user id {id} to {to_proto.LABEL} , haven't copied it there yet!")
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return None
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case 'web', 'activitypub':
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return urljoin(web_ap_base_domain(id), id)
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case 'activitypub', 'web':
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return id
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case _, 'activitypub' | 'web':
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return subdomain_wrap(from_proto, f'/{to_proto.ABBREV}/{id}')
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# only for unit tests
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case _, 'fake' | 'other':
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return f'{to_proto.LABEL}:u:{id}'
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case 'fake' | 'other', _:
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return id
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assert False, (id, from_proto, to_proto)
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def translate_handle(*, handle, from_proto, to_proto, enhanced):
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"""Translates a user handle from one protocol to another.
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Args:
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handle (str)
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from_proto (protocol.Protocol)
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to_proto (protocol.Protocol)
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enhanced (bool): whether to convert to an "enhanced" handle based on the
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user's domain
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Returns:
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str: the corresponding handle in ``to_proto``
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"""
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assert handle and from_proto and to_proto
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assert from_proto.owns_handle(handle) is not False or from_proto.LABEL == 'ui'
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if from_proto == to_proto:
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return handle
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match from_proto.LABEL, to_proto.LABEL:
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case _, 'activitypub':
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domain = handle if enhanced else f'{from_proto.ABBREV}{SUPERDOMAIN}'
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return f'@{handle}@{domain}'
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case _, 'atproto' | 'nostr':
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handle = handle.lstrip('@').replace('@', '.')
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return (handle if enhanced
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else f'{handle}.{from_proto.ABBREV}{SUPERDOMAIN}')
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case 'activitypub', 'web':
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user, instance = handle.lstrip('@').split('@')
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# TODO: get this from the actor object's url field?
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return (f'https://{user}' if user == instance
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else f'https://{instance}/@{user}')
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case _, 'web':
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return handle
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# only for unit tests
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case _, 'fake':
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return f'fake:handle:{handle}'
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case _, 'other':
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return f'other:handle:{handle}'
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assert False, (id, from_proto, to_proto)
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def translate_object_id(*, id, from_proto, to_proto):
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"""Translates a user handle from one protocol to another.
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Args:
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id (str)
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from_proto (protocol.Protocol)
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to_proto (protocol.Protocol)
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Returns:
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str: the corresponding id in ``to_proto``
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"""
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assert id and from_proto and to_proto
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assert from_proto.owns_id(id) is not False or from_proto.LABEL == 'ui'
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if from_proto == to_proto:
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return id
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if from_proto.LABEL in COPIES_PROTOCOLS or to_proto.LABEL in COPIES_PROTOCOLS:
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if obj := from_proto.load(id, remote=False):
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if copy := obj.get_copy(to_proto):
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return copy
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if orig := models.get_original(id):
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return orig.key.id()
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match from_proto.LABEL, to_proto.LABEL:
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case _, 'atproto' | 'nostr':
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logger.warning(f"Can't translate object id {id} to {to_proto.LABEL} , haven't copied it there yet!")
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return id
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case 'web', 'activitypub':
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return urljoin(web_ap_base_domain(util.domain_from_link(id)), f'/r/{id}')
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case _, 'activitypub' | 'web':
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return subdomain_wrap(from_proto, f'/convert/{to_proto.ABBREV}/{id}')
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# only for unit tests
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case _, 'fake' | 'other':
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return f'{to_proto.LABEL}:o:{from_proto.ABBREV}:{id}'
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assert False, (id, from_proto, to_proto)
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