kopia lustrzana https://github.com/snarfed/bridgy-fed
264 wiersze
8.0 KiB
Python
264 wiersze
8.0 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 granary.bluesky import BSKY_APP_URL_RE, web_url_to_at_uri
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from oauth_dropins.webutil import util
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from common import (
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LOCAL_DOMAINS,
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PRIMARY_DOMAIN,
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PROTOCOL_DOMAINS,
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subdomain_wrap,
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SUPERDOMAIN,
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)
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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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# populated in models.reset_protocol_properties
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COPIES_PROTOCOLS = None
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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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#
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# Maps string domain to string subdomain (bsky, fed, or web).
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_NON_WEB_SUBDOMAIN_SITES = None
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# Webfinger allows all sorts of characters that ATProto handles don't,
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# notably _ and ~. Map those to -.
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# https://www.rfc-editor.org/rfc/rfc7565.html#section-7
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# https://atproto.com/specs/handle
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# https://github.com/snarfed/bridgy-fed/issues/982
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# https://github.com/swicg/activitypub-webfinger/issues/9
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TO_ATPROTO_CHARS = {
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'_': '-',
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'~': '-',
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}
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def web_ap_base_domain(user_domain):
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"""Returns the full Bridgy Fed domain to use 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 and
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not (user_domain == PRIMARY_DOMAIN or user_domain in PROTOCOL_DOMAINS)):
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return request.host_url
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global _NON_WEB_SUBDOMAIN_SITES
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if _NON_WEB_SUBDOMAIN_SITES is None:
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_NON_WEB_SUBDOMAIN_SITES = {
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user.key.id(): user.ap_subdomain
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for user in Query('MagicKey',
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filters=FilterNode('ap_subdomain', '!=', 'web'),
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projection=['ap_subdomain'],
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).fetch()
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}
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logger.info(f'Loaded {len(_NON_WEB_SUBDOMAIN_SITES)} non-web.brid.gy Web users')
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subdomain = _NON_WEB_SUBDOMAIN_SITES.get(user_domain, 'web')
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return f'https://{subdomain}{SUPERDOMAIN}/'
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def translate_user_id(*, id, from_, to):
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"""Translate a user id from one protocol to another.
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TODO: unify with :func:`translate_object_id`.
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Args:
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id (str)
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from_ (protocol.Protocol)
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to (protocol.Protocol)
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Returns:
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str: the corresponding id in ``to``
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"""
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assert id and from_ and to, (id, from_, to)
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assert from_.owns_id(id) is not False or from_.LABEL == 'ui', \
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(id, from_.LABEL, to.LABEL)
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parsed = urlparse(id)
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if from_.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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# bsky.app profile URL to DID
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if to.LABEL == 'atproto':
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if match := BSKY_APP_URL_RE.match(id):
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repo = match.group('id')
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if repo.startswith('did:'):
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return repo
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from atproto import ATProto
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try:
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return ATProto.handle_to_id(repo)
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except (AssertionError, ValueError) as e:
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logger.warning(e)
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return None
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if from_ == to:
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return id
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# follow use_instead
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user = from_.get_by_id(id)
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if user:
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id = user.key.id()
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if from_.LABEL in COPIES_PROTOCOLS or to.LABEL in COPIES_PROTOCOLS:
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if user:
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if copy := user.get_copy(to):
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return copy
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if orig := models.get_original(id):
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if isinstance(orig, to):
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return orig.key.id()
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match from_.LABEL, to.LABEL:
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case _, 'atproto' | 'nostr':
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logger.warning(f"Can't translate user id {id} to {to.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_, f'/{to.ABBREV}/{id}')
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# only for unit tests
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case _, 'fake' | 'other' | 'eefake':
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return f'{to.LABEL}:u:{id}'
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case 'fake' | 'other', _:
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return id
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assert False, (id, from_.LABEL, to.LABEL)
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def translate_handle(*, handle, from_, to, 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_ (protocol.Protocol)
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to (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``
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"""
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assert handle and from_ and to, (handle, from_, to)
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assert from_.owns_handle(handle) is not False or from_.LABEL == 'ui'
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if from_ == to:
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return handle
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match from_.LABEL, to.LABEL:
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case _, 'activitypub':
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domain = f'{from_.ABBREV}{SUPERDOMAIN}'
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if enhanced or handle == PRIMARY_DOMAIN or handle in PROTOCOL_DOMAINS:
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domain = handle
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return f'@{handle}@{domain}'
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case _, 'atproto' | 'nostr':
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if to.LABEL == 'atproto':
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for from_char, to_char in TO_ATPROTO_CHARS.items():
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handle = handle.replace(from_char, to_char)
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handle = handle.lstrip('@').replace('@', '.')
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if enhanced or handle == PRIMARY_DOMAIN or handle in PROTOCOL_DOMAINS:
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return handle
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return f'{handle}.{from_.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' | 'other' | 'eefake':
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return f'{to.LABEL}:handle:{handle}'
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assert False, (handle, from_.LABEL, to.LABEL)
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def translate_object_id(*, id, from_, to):
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"""Translates a user handle from one protocol to another.
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TODO: unify with :func:`translate_user_id`.
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Args:
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id (str)
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from_ (protocol.Protocol)
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to (protocol.Protocol)
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Returns:
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str: the corresponding id in ``to``
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"""
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assert id and from_ and to, (id, from_, to)
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assert from_.owns_id(id) is not False or from_.LABEL == 'ui'
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# bsky.app profile URL to DID
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if to.LABEL == 'atproto':
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if match := BSKY_APP_URL_RE.match(id):
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repo = match.group('id')
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handle = None
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if not repo.startswith('did:'):
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handle = repo
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from atproto import ATProto
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try:
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repo = ATProto.handle_to_id(repo)
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except (AssertionError, ValueError) as e:
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logger.warning(e)
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return None
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return web_url_to_at_uri(id, handle=handle, did=repo)
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if from_ == to:
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return id
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if from_.LABEL in COPIES_PROTOCOLS or to.LABEL in COPIES_PROTOCOLS:
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if obj := from_.load(id, remote=False):
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if copy := obj.get_copy(to):
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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_.LABEL, to.LABEL:
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case _, 'atproto' | 'nostr':
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logger.warning(f"Can't translate object id {id} to {to.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_, f'/convert/{to.ABBREV}/{id}')
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# only for unit tests
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case _, 'fake' | 'other' | 'eefake':
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return f'{to.LABEL}:o:{from_.ABBREV}:{id}'
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assert False, (id, from_.LABEL, to.LABEL)
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