bridgy-fed/webfinger.py

164 wiersze
5.5 KiB
Python

"""Handles requests for WebFinger endpoints.
https://webfinger.net/
https://tools.ietf.org/html/rfc7033
"""
import datetime
import logging
import re
import urllib.parse
from flask import render_template, request
from granary import as2
from oauth_dropins.webutil import flask_util, util
from oauth_dropins.webutil.flask_util import error
from oauth_dropins.webutil.util import json_dumps, json_loads
from app import app, cache
import common
from models import User
NON_TLDS = frozenset(('html', 'json', 'php', 'xml'))
logger = logging.getLogger(__name__)
class Actor(flask_util.XrdOrJrd):
"""Serves a user's WebFinger profile."""
@flask_util.cached(cache, common.CACHE_TIME, headers=['Accept'])
def dispatch_request(self, *args, **kwargs):
return super().dispatch_request(*args, **kwargs)
def template_prefix(self):
return 'webfinger_user'
def template_vars(self, domain=None):
logger.debug(f'Headers: {list(request.headers.items())}')
if domain.split('.')[-1] in NON_TLDS:
error(f"{domain} doesn't look like a domain", status=404)
user = User.get_by_id(domain)
if not user:
error(f'No user for {domain}', status=404)
logger.info(f'Generating WebFinger data for {domain}')
actor = user.to_as1() or {}
logger.info(f'AS1 actor: {actor}')
urls = util.dedupe_urls(util.get_list(actor, 'urls') +
util.get_list(actor, 'url') +
[user.homepage])
logger.info(f'URLs: {urls}')
canonical_url = urls[0]
# generate webfinger content
data = util.trim_nulls({
'subject': 'acct:' + user.address().lstrip('@'),
'aliases': urls,
'links':
[{
'rel': 'http://webfinger.net/rel/profile-page',
'type': 'text/html',
'href': url,
} for url in urls if util.is_web(url)] +
[{
'rel': 'http://webfinger.net/rel/avatar',
'href': url,
} for url in util.get_urls(actor, 'image')] +
[{
'rel': 'canonical_uri',
'type': 'text/html',
'href': canonical_url,
},
# ActivityPub
{
'rel': 'self',
'type': as2.CONTENT_TYPE,
# WARNING: in python 2 sometimes request.host_url lost port,
# http://localhost:8080 would become just http://localhost. no
# clue how or why. pay attention here if that happens again.
'href': common.host_url(domain),
}, {
# AP reads this and sharedInbox from the AS2 actor, not
# webfinger, so strictly speaking, it's probably not needed here.
'rel': 'inbox',
'type': as2.CONTENT_TYPE,
'href': common.host_url(f'{domain}/inbox'),
}, {
# https://www.w3.org/TR/activitypub/#sharedInbox
'rel': 'sharedInbox',
'type': as2.CONTENT_TYPE,
'href': common.host_url('inbox'),
},
# remote follow
# https://socialhub.activitypub.rocks/t/what-is-the-current-spec-for-remote-follow/2020/11?u=snarfed
# https://github.com/snarfed/bridgy-fed/issues/60#issuecomment-1325589750
{
'rel': 'http://ostatus.org/schema/1.0/subscribe',
'template': common.host_url(f'user/{domain}?url={{uri}}'),
}]
})
logger.info(f'Returning WebFinger data: {json_dumps(data, indent=2)}')
return data
class Webfinger(Actor):
"""Handles Webfinger requests.
https://webfinger.net/
Supports both JRD and XRD; defaults to JRD.
https://tools.ietf.org/html/rfc7033#section-4
"""
def template_vars(self):
resource = flask_util.get_required_param('resource').strip()
resource = resource.removeprefix(common.host_url())
# handle Bridgy Fed actor URLs, eg https://fed.brid.gy/snarfed.org
host = util.domain_from_link(common.host_url())
if resource in ('', '/', f'acct:{host}', f'acct:@{host}'):
error('Expected other domain, not fed.brid.gy')
try:
user, domain = util.parse_acct_uri(resource)
if domain in common.DOMAINS:
domain = user
except ValueError:
domain = urllib.parse.urlparse(resource).netloc or resource
return super().template_vars(domain=domain)
class HostMeta(flask_util.XrdOrJrd):
"""Renders and serves the /.well-known/host-meta file.
Supports both JRD and XRD; defaults to XRD.
https://tools.ietf.org/html/rfc6415#section-3
"""
DEFAULT_TYPE = flask_util.XrdOrJrd.XRD
def template_prefix(self):
return 'host-meta'
def template_vars(self):
return {'host_uri': common.host_url()}
@app.get('/.well-known/host-meta.xrds')
def host_meta_xrds():
"""Renders and serves the /.well-known/host-meta.xrds XRDS-Simple file."""
return (render_template('host-meta.xrds', host_uri=common.host_url()),
{'Content-Type': 'application/xrds+xml'})
app.add_url_rule(f'/acct:<regex("{common.DOMAIN_RE}"):domain>',
view_func=Actor.as_view('actor_acct'))
app.add_url_rule('/.well-known/webfinger', view_func=Webfinger.as_view('webfinger'))
app.add_url_rule('/.well-known/host-meta', view_func=HostMeta.as_view('hostmeta'))
app.add_url_rule('/.well-known/host-meta.json', view_func=HostMeta.as_view('hostmeta-json'))