kopia lustrzana https://github.com/snarfed/bridgy-fed
287 wiersze
9.7 KiB
Python
287 wiersze
9.7 KiB
Python
"""Handles requests for WebFinger endpoints.
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* https://webfinger.net/
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* https://tools.ietf.org/html/rfc7033
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"""
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import logging
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from urllib.parse import urljoin, urlparse
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from flask import render_template, request
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from granary import as2
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from oauth_dropins.webutil import flask_util, util
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from oauth_dropins.webutil.flask_util import error, flash, Found
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from oauth_dropins.webutil.util import json_dumps, json_loads
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import activitypub
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import common
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from common import LOCAL_DOMAINS, PRIMARY_DOMAIN, PROTOCOL_DOMAINS, SUPERDOMAIN
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from flask_app import app, cache
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from protocol import Protocol
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from web import Web
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SUBSCRIBE_LINK_REL = 'http://ostatus.org/schema/1.0/subscribe'
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logger = logging.getLogger(__name__)
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class Webfinger(flask_util.XrdOrJrd):
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"""Serves a user's WebFinger profile.
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Supports both JRD and XRD; defaults to JRD.
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https://tools.ietf.org/html/rfc7033#section-4
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"""
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@flask_util.cached(cache, common.CACHE_TIME, headers=['Accept'])
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def dispatch_request(self, *args, **kwargs):
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return super().dispatch_request(*args, **kwargs)
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def template_prefix(self):
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return 'webfinger_user'
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def template_vars(self):
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# logger.debug(f'Headers: {list(request.headers.items())}')
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resource = flask_util.get_required_param('resource').strip()
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resource = resource.removeprefix(common.host_url())
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# handle Bridgy Fed actor URLs, eg https://fed.brid.gy/snarfed.org
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host = util.domain_from_link(common.host_url())
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if resource in ('', '/', f'acct:{host}', f'acct:@{host}'):
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error('Expected other domain, not *.brid.gy')
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allow_indirect = False
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cls = None
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try:
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user, id = util.parse_acct_uri(resource)
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cls = Protocol.for_bridgy_subdomain(id, fed='web')
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if cls:
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id = user
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allow_indirect = True
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except ValueError:
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id = urlparse(resource).netloc or resource
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if id == PRIMARY_DOMAIN or id in PROTOCOL_DOMAINS:
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cls = Web
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elif not cls:
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cls = Protocol.for_request(fed='web')
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if not cls:
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error('Unknown protocol')
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# is this a handle?
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if cls.owns_id(id) is False:
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logger.info(f'{id} is not a {cls.LABEL} id')
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handle = id
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id = None
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if cls.owns_handle(handle) is not False:
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logger.info(' ...might be a handle, trying to resolve')
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id = cls.handle_to_id(handle)
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if not id:
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error(f'{id} is not a valid {cls.LABEL} id')
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logger.info(f'Protocol {cls.LABEL}, user id {id}')
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# only allow indirect users if this id is "on" a brid.gy subdomain,
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# eg user.com@bsky.brid.gy but not user.com@user.com
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if allow_indirect:
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user = cls.get_or_create(id)
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else:
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user = cls.get_by_id(id)
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if user and not user.direct:
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error(f"{user.key} hasn't signed up yet", status=404)
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if not user or not user.is_enabled(activitypub.ActivityPub):
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error(f'No {cls.LABEL} user found for {id}', status=404)
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ap_handle = user.handle_as('activitypub')
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if not ap_handle:
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error(f'{cls.LABEL} user {id} has no handle', status=404)
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# backward compatibility for initial Web users whose AP actor ids are on
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# fed.brid.gy, not web.brid.gy
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subdomain = request.host.split('.')[0]
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if (user.LABEL == 'web'
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and subdomain not in (LOCAL_DOMAINS + (user.ap_subdomain,))):
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url = urljoin(f'https://{user.ap_subdomain}{common.SUPERDOMAIN}/',
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request.full_path)
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raise Found(location=url)
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actor = user.obj.as1 if user.obj and user.obj.as1 else {}
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logger.info(f'Generating WebFinger data for {user.key}')
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actor_id = user.id_as(activitypub.ActivityPub)
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logger.info(f'AS1 actor: {actor_id}')
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urls = util.dedupe_urls(util.get_list(actor, 'urls') +
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util.get_list(actor, 'url') +
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[user.web_url()])
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logger.info(f'URLs: {urls}')
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canonical_url = urls[0]
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# generate webfinger content
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data = util.trim_nulls({
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'subject': 'acct:' + ap_handle.lstrip('@'),
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'aliases': urls,
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'links':
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[{
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'rel': 'http://webfinger.net/rel/profile-page',
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'type': 'text/html',
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'href': url,
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} for url in urls if util.is_web(url)] +
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[{
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'rel': 'http://webfinger.net/rel/avatar',
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'href': url,
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} for url in util.get_urls(actor, 'image')] +
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[{
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'rel': 'canonical_uri',
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'type': 'text/html',
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'href': canonical_url,
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},
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# ActivityPub
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#
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# include two self links, one for each AP content type, since some
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# fediverse servers (eg Pleroma, Akkoma) are unnecessarily picky
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# about which one they use from XRD vs JRD.
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# https://github.com/snarfed/bridgy-fed/issues/995
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{
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'rel': 'self',
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'type': as2.CONTENT_TYPE_LD_PROFILE,
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'href': actor_id,
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}, {
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'rel': 'self',
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'type': as2.CONTENT_TYPE,
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'href': actor_id,
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}, {
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# AP reads this and sharedInbox from the AS2 actor, not
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# webfinger, so strictly speaking, it's probably not needed here.
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'rel': 'inbox',
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'type': as2.CONTENT_TYPE_LD_PROFILE,
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'href': actor_id + '/inbox',
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}, {
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# https://www.w3.org/TR/activitypub/#sharedInbox
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'rel': 'sharedInbox',
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'type': as2.CONTENT_TYPE_LD_PROFILE,
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'href': common.subdomain_wrap(cls, '/ap/sharedInbox'),
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},
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# remote follow
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# https://socialhub.activitypub.rocks/t/what-is-the-current-spec-for-remote-follow/2020/11?u=snarfed
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# https://github.com/snarfed/bridgy-fed/issues/60#issuecomment-1325589750
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{
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'rel': 'http://ostatus.org/schema/1.0/subscribe',
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# always use fed.brid.gy for UI pages, not protocol subdomain
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# TODO: switch to:
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# 'template': common.host_url(user.user_page_path('?url={uri}')),
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# the problem is that user_page_path() uses handle_or_id, which uses
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# custom username instead of domain, which may not be unique
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'template': f'https://{common.PRIMARY_DOMAIN}' +
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user.user_page_path('?url={uri}'),
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}]
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})
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# logger.info(f'Returning WebFinger data: {json_dumps(data, indent=2)}')
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return data
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class HostMeta(flask_util.XrdOrJrd):
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"""Renders and serves the ``/.well-known/host-meta`` file.
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Supports both JRD and XRD; defaults to XRD.
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https://tools.ietf.org/html/rfc6415#section-3
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"""
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DEFAULT_TYPE = flask_util.XrdOrJrd.XRD
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def template_prefix(self):
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return 'host-meta'
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def template_vars(self):
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return {'host_uri': common.host_url()}
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@app.get('/.well-known/host-meta.xrds')
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def host_meta_xrds():
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"""Renders and serves the ``/.well-known/host-meta.xrds`` XRDS-Simple file."""
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return (render_template('host-meta.xrds', host_uri=common.host_url()),
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{'Content-Type': 'application/xrds+xml'})
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def fetch(addr):
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"""Fetches and returns an address's WebFinger data.
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On failure, flashes a message and returns None.
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TODO: switch to raising exceptions instead of flashing messages and
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returning None
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Args:
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addr (str): a Webfinger-compatible address, eg ``@x@y``, ``acct:x@y``, or
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``https://x/y``
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Returns:
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dict: fetched WebFinger data, or None on error
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"""
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addr = addr.strip().strip('@')
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split = addr.split('@')
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if len(split) == 2:
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addr_domain = split[1]
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resource = f'acct:{addr}'
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elif util.is_web(addr):
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addr_domain = util.domain_from_link(addr, minimize=False)
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resource = addr
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else:
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flash('Enter a fediverse address in @user@domain.social format')
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return None
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try:
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resp = util.requests_get(
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f'https://{addr_domain}/.well-known/webfinger?resource={resource}')
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except BaseException as e:
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if util.is_connection_failure(e):
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flash(f"Couldn't connect to {addr_domain}")
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return None
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raise
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if not resp.ok:
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flash(f'WebFinger on {addr_domain} returned HTTP {resp.status_code}')
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return None
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try:
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data = resp.json()
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except ValueError as e:
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logger.warning(f'Got {e}', exc_info=True)
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flash(f'WebFinger on {addr_domain} returned non-JSON')
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return None
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logger.info(f'Got: {json_dumps(data, indent=2)}')
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return data
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def fetch_actor_url(addr):
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"""Fetches and returns a WebFinger address's ActivityPub actor URL.
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On failure, flashes a message and returns None.
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Args:
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addr (str): a Webfinger-compatible address, eg ``@x@y``, ``acct:x@y``, or
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``https://x/y``
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Returns:
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str: ActivityPub actor URL, or None on error or not fouund
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"""
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data = fetch(addr)
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if not data:
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return None
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for link in data.get('links', []):
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type = link.get('type', '').split(';')[0]
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if link.get('rel') == 'self' and type in as2.CONTENT_TYPES:
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return link.get('href')
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app.add_url_rule('/.well-known/webfinger', view_func=Webfinger.as_view('webfinger'))
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app.add_url_rule('/.well-known/host-meta', view_func=HostMeta.as_view('hostmeta'))
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app.add_url_rule('/.well-known/host-meta.json', view_func=HostMeta.as_view('hostmeta-json'))
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