kopia lustrzana https://github.com/snarfed/bridgy-fed
218 wiersze
7.7 KiB
Python
218 wiersze
7.7 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 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 render_template, request
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from granary import as2, atom, microformats2
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import mf2util
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from oauth_dropins.webutil import flask_util, util
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from oauth_dropins.webutil.flask_util import error
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from oauth_dropins.webutil.util import json_dumps
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from app import app, cache
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import common
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from models import User
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NON_TLDS = frozenset(('html', 'json', 'php', 'xml'))
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logger = logging.getLogger(__name__)
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class Actor(flask_util.XrdOrJrd):
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"""Fetches a site's home page, converts its mf2 to WebFinger, and serves.
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TODO: unify with common.actor()
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"""
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@flask_util.cached(cache, common.CACHE_TIME, headers=['Accept'], http_5xx=True)
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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, url=None):
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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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# find representative h-card. try url, then url's home page, then domain
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urls = [f'https://{domain}/']
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if url:
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urls = [url, urllib.parse.urljoin(url, '/')] + urls
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for candidate in urls:
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try:
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resp = util.requests_get(candidate)
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except ValueError:
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logger.warning('', exc_info=True)
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continue
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parsed = util.parse_html(resp)
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mf2 = util.parse_mf2(parsed, url=resp.url)
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# logger.debug(f'Parsed mf2 for {resp.url}: {json_dumps(mf2, indent=2)}')
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hcard = mf2util.representative_hcard(mf2, resp.url)
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if hcard:
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logger.info(f'Representative h-card: {json_dumps(hcard, indent=2)}')
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break
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else:
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error(f"didn't find a representative h-card (http://microformats.org/wiki/representative-hcard-parsing) in any of {urls}")
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logger.info(f'Generating WebFinger data for {domain}')
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user = User.get_or_create(domain)
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props = hcard.get('properties', {})
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urls = util.dedupe_urls(props.get('url', []) + [resp.url])
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canonical_url = urls[0]
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user.actor_as2 = json_dumps(common.postprocess_as2(
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as2.from_as1(microformats2.json_to_object(hcard)), user=user))
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user.put()
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# discover atom feed, if any
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feed = parsed.find('link', rel='alternate', type=atom.CONTENT_TYPE)
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if feed and feed['href']:
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feed = urllib.parse.urljoin(resp.url, feed['href'])
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else:
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feed = 'https://granary.io/url?' + urllib.parse.urlencode({
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'input': 'html',
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'output': 'atom',
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'url': resp.url,
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'hub': resp.url,
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})
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# discover PuSH, if any
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for link in resp.headers.get('Link', '').split(','):
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match = common.LINK_HEADER_RE.match(link)
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if match and match.group(2) == 'hub':
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hub = match.group(1)
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else:
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hub = 'https://bridgy-fed.superfeedr.com/'
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# generate webfinger content
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data = util.trim_nulls({
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'subject': 'acct:' + user.address().lstrip('@'),
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'aliases': urls,
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'magic_keys': [{'value': user.href()}],
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'links': sum(([{
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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 url.startswith("http")), []) + [{
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'rel': 'http://webfinger.net/rel/avatar',
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'href': microformats2.get_text(url),
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} for url in props.get('photo', [])] + [{
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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': common.host_url(domain),
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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': common.host_url(f'{domain}/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('inbox'),
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},
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# OStatus
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{
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'rel': 'http://schemas.google.com/g/2010#updates-from',
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'type': atom.CONTENT_TYPE,
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'href': feed,
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}, {
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'rel': 'hub',
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'href': hub,
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}, {
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'rel': 'magic-public-key',
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'href': user.href(),
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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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'template': common.host_url(f'user/{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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try:
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user, domain = util.parse_acct_uri(resource)
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if domain in common.DOMAINS:
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domain = user
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except ValueError:
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domain = urllib.parse.urlparse(resource).netloc or resource
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url = None
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if util.is_web(resource):
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url = resource
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return super().template_vars(domain=domain, url=url)
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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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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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