kopia lustrzana https://github.com/snarfed/bridgy-fed
287 wiersze
12 KiB
Python
287 wiersze
12 KiB
Python
"""Handles inbound webmentions.
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TODO tests:
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* actor/attributedTo could be string URL
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"""
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import logging
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import urllib.parse
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from urllib.parse import urlencode
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import feedparser
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from flask import request
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from flask.views import View
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from google.cloud.ndb import Key
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from granary import as1, 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.appengine_config import tasks_client
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from oauth_dropins.webutil.appengine_info import APP_ID
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from oauth_dropins.webutil.flask_util import error
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from oauth_dropins.webutil.util import json_dumps, json_loads
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import requests
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from werkzeug.exceptions import BadGateway
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import activitypub
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from app import app
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import common
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from models import Activity, Follower, User
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logger = logging.getLogger(__name__)
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SKIP_EMAIL_DOMAINS = frozenset(('localhost', 'snarfed.org'))
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# https://cloud.google.com/appengine/docs/locations
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TASKS_LOCATION = 'us-central1'
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class Webmention(View):
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"""Handles inbound webmention, converts to ActivityPub."""
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IS_TASK = False
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source_url = None # string
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source_domain = None # string
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source_mf2 = None # parsed mf2 dict
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source_obj = None # parsed AS1 dict
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target_resp = None # requests.Response
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user = None # User
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def dispatch_request(self):
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logger.info(f'Params: {list(request.form.items())}')
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# fetch source page
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source = flask_util.get_required_param('source')
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logger.info(f'webmention from {util.domain_from_link(source, minimize=False)}')
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try:
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source_resp = util.requests_get(source, gateway=True)
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except ValueError as e:
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error(f'Bad source URL: {source}: {e}')
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self.source_url = source_resp.url or source
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self.source_domain = urllib.parse.urlparse(self.source_url).netloc.split(':')[0]
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fragment = urllib.parse.urlparse(self.source_url).fragment
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self.source_mf2 = util.parse_mf2(source_resp, id=fragment)
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if id and self.source_mf2 is None:
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error(f'id {fragment} not found in {self.source_url}')
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# logger.debug(f'Parsed mf2 for {source_resp.url} : {json_dumps(self.source_mf2 indent=2)}')
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# check for backlink to bridgy fed (for webmention spec and to confirm
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# source's intent to federate to mastodon)
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for domain in common.DOMAINS:
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if domain in source_resp.text:
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break
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else:
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error(f"Couldn't find link to {common.host_url().rstrip('/')}")
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# convert source page to ActivityStreams
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entry = mf2util.find_first_entry(self.source_mf2, ['h-entry'])
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if not entry:
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error(f'No microformats2 found on {self.source_url}')
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logger.info(f'First entry (id={fragment}): {json_dumps(entry, indent=2)}')
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# make sure it has url, since we use that for AS2 id, which is required
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# for ActivityPub.
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props = entry.setdefault('properties', {})
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if not props.get('url'):
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props['url'] = [self.source_url]
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self.source_obj = microformats2.json_to_object(entry, fetch_mf2=True)
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type_label = ' '.join((
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self.source_obj.get('verb', ''),
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self.source_obj.get('objectType', ''),
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util.get_first(self.source_obj, 'object', {}).get('objectType', ''),
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))
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logger.info(f'Converted webmention to AS1: {type_label}: {json_dumps(self.source_obj, indent=2)}')
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self.user = User.get_or_create(self.source_domain)
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ret = self.try_activitypub()
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return ret or 'No ActivityPub targets'
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def try_activitypub(self):
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"""Attempts ActivityPub delivery.
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Returns Flask response (string body or tuple) if we succeeded or failed,
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None if ActivityPub was not available.
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"""
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targets = self._activitypub_targets()
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if not targets:
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return None
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error = None
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last_success = None
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# TODO: collect by inbox, add 'to' fields, de-dupe inboxes and recipients
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for activity, inbox in targets:
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target_obj = json_loads(activity.target_as2) if activity.target_as2 else None
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source_activity = common.postprocess_as2(
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as2.from_as1(self.source_obj), target=target_obj, user=self.user)
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if not source_activity.get('actor'):
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source_activity['actor'] = common.host_url(self.source_domain)
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if activity.status == 'complete':
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if activity.source_mf2:
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def content(mf2):
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items = mf2.get('items')
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if items:
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return microformats2.first_props(
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items[0].get('properties')
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).get('content')
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orig_content = content(json_loads(activity.source_mf2))
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new_content = content(self.source_mf2)
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if orig_content and new_content and orig_content == new_content:
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logger.info(f'Skipping; new content is same as content published before at {activity.updated}')
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continue
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if source_activity.get('type') == 'Create':
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source_activity['type'] = 'Update'
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if self.source_obj.get('verb') == 'follow':
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# prefer AS2 id or url, if available
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# https://github.com/snarfed/bridgy-fed/issues/307
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dest = ((target_obj.get('id') or util.get_first(target_obj, 'url'))
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if target_obj else util.get_url(self.source_obj, 'object'))
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Follower.get_or_create(dest=dest, src=self.source_domain,
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last_follow=json_dumps(self.source_obj))
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try:
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last = common.signed_post(inbox, data=source_activity, user=self.user)
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activity.status = 'complete'
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last_success = last
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except BaseException as e:
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error = e
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activity.status = 'error'
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activity.put()
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# Pass the AP response status code and body through as our response
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if last_success:
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return last_success.text or 'Sent!', last_success.status_code
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elif isinstance(error, BadGateway):
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raise error
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elif isinstance(error, requests.HTTPError):
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return str(error), error.status_code
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else:
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return str(error)
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def _activitypub_targets(self):
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"""
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Returns: list of (Activity, string inbox URL)
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"""
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# if there's in-reply-to, like-of, or repost-of, they're the targets.
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# otherwise, it's all followers' inboxes.
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targets = util.get_urls(self.source_obj, 'inReplyTo')
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if targets:
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logger.info(f'targets from inReplyTo: {targets}')
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elif self.source_obj.get('verb') in as1.VERBS_WITH_OBJECT:
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targets = util.get_urls(self.source_obj, 'object')
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logger.info(f'targets from object: {targets}')
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if not targets:
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# interpret this as a Create or Update, deliver it to followers. use
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# task queue since we send to each inbox in serial, which can take a
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# long time with many followers/instances.
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if not self.IS_TASK:
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queue_path= tasks_client.queue_path(APP_ID, TASKS_LOCATION, 'webmention')
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tasks_client.create_task(
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parent=queue_path,
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task={
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'app_engine_http_request': {
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'http_method': 'POST',
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'relative_uri': '/_ah/queue/webmention',
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'body': urlencode({'source': self.source_url}).encode(),
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# https://googleapis.dev/python/cloudtasks/latest/gapic/v2/types.html#google.cloud.tasks_v2.types.AppEngineHttpRequest.headers
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'headers': {'Content-Type': 'application/x-www-form-urlencoded'},
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},
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},
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)
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# not actually an error
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error('Delivering to followers in the background', status=202)
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inboxes = set()
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for follower in Follower.query().filter(
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Follower.key > Key('Follower', self.source_domain + ' '),
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Follower.key < Key('Follower', self.source_domain + chr(ord(' ') + 1))):
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if follower.status != 'inactive' and follower.last_follow:
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actor = json_loads(follower.last_follow).get('actor')
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if actor and isinstance(actor, dict):
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inboxes.add(actor.get('endpoints', {}).get('sharedInbox') or
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actor.get('publicInbox')or
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actor.get('inbox'))
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inboxes = [(Activity.get_or_create(
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source=self.source_url, target=inbox,
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domain=[self.source_domain], direction='out',
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protocol='activitypub', source_mf2=json_dumps(self.source_mf2)),
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inbox) for inbox in sorted(inboxes) if inbox]
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logger.info(f"Delivering to followers' inboxes: {[i for _, i in inboxes]}")
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return inboxes
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targets = common.remove_blocklisted(targets)
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if not targets:
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error(f"Silo responses are not yet supported.")
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activities_and_inbox_urls = []
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for target in targets:
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# fetch target page as AS2 object
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try:
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self.target_resp = common.get_as2(target)
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except (requests.HTTPError, BadGateway) as e:
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self.target_resp = getattr(e, 'requests_response', None)
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if self.target_resp and self.target_resp.status_code // 100 == 2:
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content_type = common.content_type(self.target_resp) or ''
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if content_type.startswith('text/html'):
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continue # give up
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raise
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target_url = self.target_resp.url or target
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activity = Activity.get_or_create(
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source=self.source_url, target=target_url, domain=[self.source_domain],
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direction='out', protocol='activitypub',
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source_mf2=json_dumps(self.source_mf2))
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# find target's inbox
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target_obj = self.target_resp.json()
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activity.target_as2 = json_dumps(target_obj)
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inbox_url = target_obj.get('inbox')
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if not inbox_url:
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# TODO: test actor/attributedTo and not, with/without inbox
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actor = (util.get_first(target_obj, 'actor') or
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util.get_first(target_obj, 'attributedTo'))
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if isinstance(actor, dict):
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inbox_url = actor.get('inbox')
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actor = util.get_first(actor, 'url') or actor.get('id')
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if not inbox_url and not actor:
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error('Target object has no actor or attributedTo with URL or id.')
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elif not isinstance(actor, str):
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error(f'Target actor or attributedTo has unexpected url or id object: {actor}')
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if not inbox_url:
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# fetch actor as AS object
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actor = common.get_as2(actor).json()
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inbox_url = actor.get('inbox')
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if not inbox_url:
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# TODO: probably need a way to surface errors like this
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logging.error('Target actor has no inbox')
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continue
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inbox_url = urllib.parse.urljoin(target_url, inbox_url)
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activities_and_inbox_urls.append((activity, inbox_url))
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logger.info(f"Delivering to targets' inboxes: {[i for _, i in activities_and_inbox_urls]}")
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return activities_and_inbox_urls
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class WebmentionTask(Webmention):
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IS_TASK = True
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app.add_url_rule('/webmention', view_func=Webmention.as_view('webmention'),
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methods=['POST'])
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app.add_url_rule('/_ah/queue/webmention',
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view_func=WebmentionTask.as_view('webmention-task'),
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methods=['POST'])
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