kopia lustrzana https://github.com/snarfed/bridgy-fed
238 wiersze
7.9 KiB
Python
238 wiersze
7.9 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 datetime
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import logging
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import re
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import urllib.parse
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from flask import g, 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
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from oauth_dropins.webutil.util import json_dumps, json_loads
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import common
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from flask_app import app, cache
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from models import User
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from web import Web
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NON_TLDS = frozenset(('html', 'json', 'php', 'xml'))
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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 Actor(flask_util.XrdOrJrd):
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"""Serves a user's WebFinger profile."""
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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, domain=None, allow_indirect=False):
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"""
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Args:
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domain: str, user domain
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allow_indirect: bool, whether this may be an indirect user, ie without
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an existing :class:`User`
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"""
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logger.debug(f'Headers: {list(request.headers.items())}')
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if domain.split('.')[-1] in NON_TLDS:
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error(f"{domain} doesn't look like a domain", status=404)
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if allow_indirect:
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g.user = Web.get_or_create(domain)
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else:
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g.user = Web.get_by_id(domain)
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if not g.user:
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error(f'No user or web site found for {domain}', status=404)
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actor = g.user.to_as1() or {}
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logger.info(f'Generating WebFinger data for {domain}')
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logger.info(f'AS1 actor: {actor}')
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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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[g.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:' + g.user.ap_address().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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'rel': 'self',
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'type': as2.CONTENT_TYPE,
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# WARNING: in python 2 sometimes request.host_url lost port,
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# http://localhost:8080 would become just http://localhost. no
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# clue how or why. pay attention here if that happens again.
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'href': g.user.ap_actor(),
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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,
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'href': g.user.ap_actor('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,
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'href': common.host_url('/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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# TODO(#512) switch to:
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# 'template': common.host_url(g.user.user_page_path('?url={uri}')),
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# the problem is that user_page_path() uses readable_id, which uses
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# custom username instead of domain, which may not be unique
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'template': common.host_url(f'web/{domain}?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 Webfinger(Actor):
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"""Handles Webfinger requests.
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https://webfinger.net/
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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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def template_vars(self):
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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 fed.brid.gy')
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allow_indirect = False
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try:
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user, domain = util.parse_acct_uri(resource)
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# TODO(#512): infer protocol, pass through
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if domain in common.DOMAINS:
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domain = user
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allow_indirect=True
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except ValueError:
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domain = urllib.parse.urlparse(resource).netloc or resource
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return super().template_vars(domain=domain, allow_indirect=allow_indirect)
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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: unit tests. right now it's only tested indirectly, in test_follow.
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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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# TODO: why do we serve this URL? should we drop it?
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app.add_url_rule(f'/acct:<regex("{common.DOMAIN_RE}"):domain>',
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view_func=Actor.as_view('actor_acct'))
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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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