kopia lustrzana https://github.com/snarfed/bridgy-fed
255 wiersze
8.5 KiB
Python
255 wiersze
8.5 KiB
Python
"""Handles requests for WebFinger endpoints.
|
|
|
|
* https://webfinger.net/
|
|
* https://tools.ietf.org/html/rfc7033
|
|
"""
|
|
import logging
|
|
import urllib.parse
|
|
|
|
from flask import g, render_template, request
|
|
from granary import as2
|
|
from oauth_dropins.webutil import flask_util, util
|
|
from oauth_dropins.webutil.flask_util import error, flash
|
|
from oauth_dropins.webutil.util import json_dumps, json_loads
|
|
|
|
import common
|
|
from flask_app import app, cache
|
|
from protocol import Protocol
|
|
from web import Web
|
|
|
|
SUBSCRIBE_LINK_REL = 'http://ostatus.org/schema/1.0/subscribe'
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class Webfinger(flask_util.XrdOrJrd):
|
|
"""Serves a user's WebFinger profile.
|
|
|
|
Supports both JRD and XRD; defaults to JRD.
|
|
https://tools.ietf.org/html/rfc7033#section-4
|
|
"""
|
|
@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):
|
|
logger.debug(f'Headers: {list(request.headers.items())}')
|
|
|
|
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 *.brid.gy')
|
|
|
|
allow_indirect = False
|
|
cls = None
|
|
try:
|
|
user, id = util.parse_acct_uri(resource)
|
|
cls = Protocol.for_bridgy_subdomain(id, fed=Web)
|
|
if cls:
|
|
id = user
|
|
allow_indirect = True
|
|
except ValueError:
|
|
id = urllib.parse.urlparse(resource).netloc or resource
|
|
|
|
if not cls:
|
|
cls = Protocol.for_request(fed=Web)
|
|
|
|
if cls.owns_id(id) is False:
|
|
logger.info(f'{id} is not a {cls.LABEL} id')
|
|
handle = id
|
|
id = None
|
|
if cls.owns_handle(handle) is not False:
|
|
logger.info(' ...might be a handle, trying to resolve')
|
|
id = cls.handle_to_id(handle)
|
|
|
|
if not id:
|
|
error(f'{id} is not a valid {cls.LABEL} id')
|
|
|
|
logger.info(f'Protocol {cls.LABEL}, user id {id}')
|
|
|
|
# only allow indirect users if this id is "on" a brid.gy subdomain,
|
|
# eg user.com@bsky.brid.gy but not user.com@user.com
|
|
if allow_indirect:
|
|
g.user = cls.get_or_create(id)
|
|
else:
|
|
g.user = cls.get_by_id(id)
|
|
if g.user and not g.user.direct:
|
|
error(f"{g.user.key} hasn't signed up yet", status=404)
|
|
|
|
if not g.user:
|
|
error(f'No {cls.LABEL} user found for {id}', status=404)
|
|
|
|
actor = g.user.obj.as1 if g.user.obj and g.user.obj.as1 else {}
|
|
logger.info(f'Generating WebFinger data for {g.user.key}')
|
|
logger.info(f'AS1 actor: {actor}')
|
|
urls = util.dedupe_urls(util.get_list(actor, 'urls') +
|
|
util.get_list(actor, 'url') +
|
|
[g.user.web_url()])
|
|
logger.info(f'URLs: {urls}')
|
|
canonical_url = urls[0]
|
|
|
|
# generate webfinger content
|
|
data = util.trim_nulls({
|
|
'subject': 'acct:' + g.user.ap_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': g.user.ap_actor(),
|
|
}, {
|
|
# 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': g.user.ap_actor('inbox'),
|
|
}, {
|
|
# https://www.w3.org/TR/activitypub/#sharedInbox
|
|
'rel': 'sharedInbox',
|
|
'type': as2.CONTENT_TYPE,
|
|
'href': common.host_url('/ap/sharedInbox'),
|
|
},
|
|
|
|
# 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',
|
|
# TODO: switch to:
|
|
# 'template': common.host_url(g.user.user_page_path('?url={uri}')),
|
|
# the problem is that user_page_path() uses handle_or_id, which uses
|
|
# custom username instead of domain, which may not be unique
|
|
'template': common.host_url(f'{cls.ABBREV}/{id}?url={{uri}}'),
|
|
}]
|
|
})
|
|
|
|
logger.info(f'Returning WebFinger data: {json_dumps(data, indent=2)}')
|
|
return data
|
|
|
|
|
|
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'})
|
|
|
|
|
|
def fetch(addr):
|
|
"""Fetches and returns an address's WebFinger data.
|
|
|
|
On failure, flashes a message and returns None.
|
|
|
|
TODO: switch to raising exceptions instead of flashing messages and
|
|
returning None
|
|
|
|
Args:
|
|
addr (str): a Webfinger-compatible address, eg @x@y, acct:x@y, or
|
|
https://x/y
|
|
|
|
Returns:
|
|
dict: fetched WebFinger data, or None on error
|
|
"""
|
|
addr = addr.strip().strip('@')
|
|
split = addr.split('@')
|
|
if len(split) == 2:
|
|
addr_domain = split[1]
|
|
resource = f'acct:{addr}'
|
|
elif util.is_web(addr):
|
|
addr_domain = util.domain_from_link(addr, minimize=False)
|
|
resource = addr
|
|
else:
|
|
flash('Enter a fediverse address in @user@domain.social format')
|
|
return None
|
|
|
|
try:
|
|
resp = util.requests_get(
|
|
f'https://{addr_domain}/.well-known/webfinger?resource={resource}')
|
|
except BaseException as e:
|
|
if util.is_connection_failure(e):
|
|
flash(f"Couldn't connect to {addr_domain}")
|
|
return None
|
|
raise
|
|
|
|
if not resp.ok:
|
|
flash(f'WebFinger on {addr_domain} returned HTTP {resp.status_code}')
|
|
return None
|
|
|
|
try:
|
|
data = resp.json()
|
|
except ValueError as e:
|
|
logger.warning(f'Got {e}', exc_info=True)
|
|
flash(f'WebFinger on {addr_domain} returned non-JSON')
|
|
return None
|
|
|
|
logger.info(f'Got: {json_dumps(data, indent=2)}')
|
|
return data
|
|
|
|
|
|
def fetch_actor_url(addr):
|
|
"""Fetches and returns a WebFinger address's ActivityPub actor URL.
|
|
|
|
On failure, flashes a message and returns None.
|
|
|
|
Args:
|
|
addr (str): a Webfinger-compatible address, eg ``@x@y``, ``acct:x@y``, or
|
|
``https://x/y``
|
|
|
|
Returns:
|
|
str: ActivityPub actor URL, or None on error or not fouund
|
|
"""
|
|
data = fetch(addr)
|
|
if not data:
|
|
return None
|
|
|
|
for link in data.get('links', []):
|
|
type = link.get('type', '').split(';')[0]
|
|
if link.get('rel') == 'self' and type in as2.CONTENT_TYPES:
|
|
return link.get('href')
|
|
|
|
|
|
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'))
|