kopia lustrzana https://github.com/snarfed/bridgy-fed
652 wiersze
23 KiB
Python
652 wiersze
23 KiB
Python
"""ATProto protocol implementation.
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https://atproto.com/
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"""
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import itertools
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import logging
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import os
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import re
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from arroba import did
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from arroba.datastore_storage import AtpRemoteBlob, AtpRepo, DatastoreStorage
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from arroba.repo import Repo, Write
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import arroba.server
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from arroba.storage import Action, CommitData
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from arroba.util import at_uri, dag_cbor_cid, next_tid, parse_at_uri, service_jwt
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import dag_json
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from flask import abort, request
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from google.cloud import dns
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from google.cloud import ndb
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from granary import as1, bluesky
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from lexrpc import Client
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import requests
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from requests import RequestException
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from oauth_dropins.webutil.appengine_config import ndb_client
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from oauth_dropins.webutil.appengine_info import DEBUG
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from oauth_dropins.webutil.models import StringIdModel
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from oauth_dropins.webutil import util
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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 common import (
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add,
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DOMAIN_BLOCKLIST,
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DOMAIN_RE,
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DOMAINS,
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error,
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USER_AGENT,
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)
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import flask_app
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import ids
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from models import Object, PROTOCOLS, Target, User
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from protocol import Protocol
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logger = logging.getLogger(__name__)
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arroba.server.storage = DatastoreStorage(ndb_client=ndb_client)
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appview = Client(f'https://{os.environ["APPVIEW_HOST"]}',
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headers={'User-Agent': USER_AGENT})
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LEXICONS = appview.defs
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# https://atproto.com/guides/applications#record-types
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COLLECTION_TO_TYPE = {
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'app.bsky.actor.profile': 'profile',
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'app.bsky.feed.like': 'like',
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'app.bsky.feed.post': 'post',
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'app.bsky.feed.repost': 'repost',
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'app.bsky.graph.follow': 'follow',
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}
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DNS_GCP_PROJECT = 'brid-gy'
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DNS_ZONE = 'brid-gy'
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DNS_TTL = 10800 # seconds
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logger.info(f'Using GCP DNS project {DNS_GCP_PROJECT} zone {DNS_ZONE}')
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dns_client = dns.Client(project=DNS_GCP_PROJECT)
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class DatastoreClient(Client):
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"""Bluesky client that uses the datastore as well as remote XRPC calls.
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Overrides ``getRecord`` and ``resolveHandle``. If we have a record or DID
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document stored locally, uses it as is instead of making a remote XRPC call.
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Otherwise, passes through to the server.
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Right now, requires that the server address is the same as
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``$APPVIEW_HOST``, because ``getRecord`` passes through to ``ATProto.load``
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and then to ``ATProto.fetch``, which uses the ``appview`` global.
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"""
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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assert self.address == f'https://{os.environ["APPVIEW_HOST"]}', self.address
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def call(self, nsid, input=None, headers={}, **params):
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if nsid == 'com.atproto.repo.getRecord':
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if ret := self.get_record(**params):
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return ret
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if nsid == 'com.atproto.identity.resolveHandle':
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if ret := self.resolve_handle(**params):
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return ret
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return super().call(nsid, input=input, headers=headers, **params)
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def get_record(self, repo=None, collection=None, rkey=None):
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assert repo and collection and rkey, (repo, collection, rkey)
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uri = at_uri(did=repo, collection=collection, rkey=rkey)
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if obj := ATProto.load(uri):
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return {
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'uri': uri,
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'cid': obj.bsky.get('cid') or dag_cbor_cid(obj.bsky).encode('base32'),
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'value': obj.bsky,
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}
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def resolve_handle(self, handle=None):
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assert handle
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got = (ATProto.query(ATProto.handle == handle).get() # native Bluesky user
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or AtpRepo.query(AtpRepo.handles == handle).get()) # bridged user
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if got:
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return {'did': got.key.id()}
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def did_to_handle(did):
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"""Resolves a DID to a handle _if_ we have the DID doc stored locally.
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Args:
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did (str)
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Returns:
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str: handle, or None
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"""
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if did_obj := ATProto.load(did, did_doc=True):
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if aka := util.get_first(did_obj.raw, 'alsoKnownAs', ''):
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handle, _, _ = parse_at_uri(aka)
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if handle:
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return handle
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class Cursor(StringIdModel):
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"""The last cursor (sequence number) we've seen for a host and event stream.
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https://atproto.com/specs/event-stream#sequence-numbers
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Key id is ``[HOST] [XRPC]``, where ``[XRPC]`` is the NSID of the XRPC method
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for the event stream. For example, `subscribeRepos` on the production relay
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is ``bsky.network com.atproto.sync.subscribeRepos``.
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``cursor`` is the latest sequence number that we know we've seen, so when we
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re-subscribe to this event stream, we should send ``cursor + 1``.
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"""
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cursor = ndb.IntegerProperty()
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created = ndb.DateTimeProperty(auto_now_add=True)
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updated = ndb.DateTimeProperty(auto_now=True)
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class ATProto(User, Protocol):
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"""AT Protocol class.
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Key id is DID, currently either did:plc or did:web.
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https://atproto.com/specs/did
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"""
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ABBREV = 'bsky'
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PHRASE = 'Bluesky'
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LOGO_HTML = '<img src="/oauth_dropins_static/bluesky.svg">'
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# note that PDS hostname is atproto.brid.gy here, not bsky.brid.gy. Bluesky
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# team currently has our hostname as atproto.brid.gy in their federation
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# test. also note that PDS URL shouldn't include trailing slash.
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# https://atproto.com/specs/did#did-documents
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PDS_URL = f'https://atproto{common.SUPERDOMAIN}'
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CONTENT_TYPE = 'application/json'
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HAS_COPIES = True
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REQUIRES_AVATAR = True
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REQUIRES_NAME = True
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DEFAULT_ENABLED_PROTOCOLS = ()
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def _pre_put_hook(self):
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"""Validate id, require did:plc or non-blocklisted did:web."""
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super()._pre_put_hook()
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id = self.key.id()
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assert id
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if id.startswith('did:plc:'):
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assert id.removeprefix('did:plc:')
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elif id.startswith('did:web:'):
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domain = id.removeprefix('did:web:')
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assert (re.match(common.DOMAIN_RE, domain)
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and not Protocol.is_blocklisted(domain)), domain
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else:
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assert False, f'{id} is not valid did:plc or did:web'
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@ndb.ComputedProperty
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def handle(self):
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"""Returns handle if the DID document includes one, otherwise None."""
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return did_to_handle(self.key.id())
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def web_url(self):
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return bluesky.Bluesky.user_url(self.handle_or_id())
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@classmethod
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def owns_id(cls, id):
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return (id.startswith('at://')
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or id.startswith('did:plc:')
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or id.startswith('did:web:')
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or id.startswith('https://bsky.app/'))
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@classmethod
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def owns_handle(cls, handle, allow_internal=False):
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# TODO: implement allow_internal
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if not did.HANDLE_RE.fullmatch(handle):
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return False
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@classmethod
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def handle_to_id(cls, handle):
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assert cls.owns_handle(handle) is not False
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# TODO: shortcut our own handles? eg snarfed.org.web.brid.gy
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user = ATProto.query(ATProto.handle == handle).get()
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if user:
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return user.key.id()
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return did.resolve_handle(handle, get_fn=util.requests_get)
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@classmethod
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def bridged_web_url_for(cls, user):
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"""Returns a bridged user's profile URL on bsky.app.
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For example, returns ``https://bsky.app/profile/alice.com.web.brid.gy``
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for Web user ``alice.com``.
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Args:
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user (models.User)
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Returns:
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str, or None if there isn't a canonical URL
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"""
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if not isinstance(user, ATProto):
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if did := user.get_copy(ATProto):
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return bluesky.Bluesky.user_url(did_to_handle(did) or did)
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@classmethod
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def target_for(cls, obj, shared=False):
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"""Returns our PDS URL as the target for the given object.
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ATProto delivery is indirect. We write all records to the user's local
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repo that we host, then relays and other subscribers receive them via the
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subscribeRepos event streams. So, we use a single target, our base URL
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(eg ``https://atproto.brid.gy``) as the PDS URL, for all activities.
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"""
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if cls.owns_id(obj.key.id()) is not False:
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return cls.PDS_URL
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@classmethod
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def pds_for(cls, obj):
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"""Returns the PDS URL for the given object, or None.
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Args:
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obj (Object)
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Returns:
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str:
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"""
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id = obj.key.id()
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# logger.debug(f'Finding ATProto PDS for {id}')
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if id.startswith('did:'):
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if obj.raw:
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for service in obj.raw.get('service', []):
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if service.get('id') in ('#atproto_pds', f'{id}#atproto_pds'):
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return service.get('serviceEndpoint')
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logger.info(f"{id}'s DID doc has no ATProto PDS")
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return None
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if id.startswith('https://bsky.app/'):
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return cls.pds_for(Object(id=bluesky.web_url_to_at_uri(id)))
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if id.startswith('at://'):
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repo, collection, rkey = parse_at_uri(id)
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if not repo.startswith('did:'):
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# repo is a handle; resolve it
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repo_did = cls.handle_to_id(repo)
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if repo_did:
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return cls.pds_for(Object(id=id.replace(
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f'at://{repo}', f'at://{repo_did}')))
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else:
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return None
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did_obj = ATProto.load(repo, did_doc=True)
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if did_obj:
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return cls.pds_for(did_obj)
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# TODO: what should we do if the DID doesn't exist? should we return
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# None here? or do we need this path to return BF's URL so that we
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# then create the DID for non-ATP users on demand?
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# don't use Object.as1 if bsky is set, since that conversion calls
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# pds_for, which would infinite loop
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if not obj.bsky and obj.as1:
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if owner := as1.get_owner(obj.as1):
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if user_key := Protocol.key_for(owner):
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if user := user_key.get():
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if owner_did := user.get_copy(ATProto):
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return cls.pds_for(Object(id=f'at://{owner_did}'))
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return None
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def is_blocklisted(url, allow_internal=False):
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# don't block common.DOMAINS since we want ourselves, ie our own PDS, to
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# be a valid domain to send to
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return util.domain_or_parent_in(util.domain_from_link(url), DOMAIN_BLOCKLIST)
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@classmethod
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@ndb.transactional()
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def create_for(cls, user):
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"""Creates an ATProto repo and profile for a non-ATProto user.
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Args:
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user (models.User)
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Raises:
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ValueError: if the user's handle is invalid, eg begins or ends with an
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underscore or dash
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"""
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assert not isinstance(user, ATProto)
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if user.get_copy(ATProto):
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return
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# create new DID, repo
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# PDS URL shouldn't include trailing slash!
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# https://atproto.com/specs/did#did-documents
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pds_url = common.host_url().rstrip('/') if DEBUG else cls.PDS_URL
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handle = user.handle_as('atproto')
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logger.info(f'Creating new did:plc for {user.key} {handle} {pds_url}')
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did_plc = did.create_plc(handle, pds_url=pds_url, post_fn=util.requests_post)
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Object.get_or_create(did_plc.did, raw=did_plc.doc, authed_as=did_plc)
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# TODO: move this to ATProto.get_or_create?
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add(user.copies, Target(uri=did_plc.did, protocol='atproto'))
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# create _atproto DNS record for handle resolution
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# https://atproto.com/specs/handle#handle-resolution
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name = f'_atproto.{handle}.'
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val = f'"did={did_plc.did}"'
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logger.info(f'adding GCP DNS TXT record for {name} {val}')
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if DEBUG:
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logger.info(' skipped since DEBUG is true')
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else:
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zone = dns_client.zone(DNS_ZONE)
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r = zone.resource_record_set(name=name, record_type='TXT', ttl=DNS_TTL,
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rrdatas=[val])
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changes = zone.changes()
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changes.add_record_set(r)
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changes.create()
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logger.info(' done!')
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# fetch and store profile
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if not user.obj:
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user.obj = user.load(user.profile_id())
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initial_writes = []
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if user.obj and user.obj.as1:
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# create user profile
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profile = cls.convert(user.obj, fetch_blobs=True, from_user=user)
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logger.info(f'Storing ATProto app.bsky.actor.profile self')
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initial_writes.append(
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Write(action=Action.CREATE, collection='app.bsky.actor.profile',
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rkey='self', record=profile))
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uri = at_uri(did_plc.did, 'app.bsky.actor.profile', 'self')
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user.obj.add('copies', Target(uri=uri, protocol='atproto'))
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user.obj.put()
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# create chat declaration
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logger.info(f'Storing ATProto chat declaration record')
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chat_declaration = {
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"$type" : "chat.bsky.actor.declaration",
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"allowIncoming" : "none",
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}
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initial_writes.append(
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Write(action=Action.CREATE, collection='chat.bsky.actor.declaration',
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rkey='self', record=chat_declaration))
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repo = Repo.create(
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arroba.server.storage, did_plc.did, handle=handle,
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callback=lambda _: common.create_task(queue='atproto-commit'),
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initial_writes=initial_writes,
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signing_key=did_plc.signing_key,
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rotation_key=did_plc.rotation_key)
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user.put()
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@classmethod
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def send(to_cls, obj, url, from_user=None, orig_obj=None):
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"""Creates a record if we own its repo.
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If the repo's DID doc doesn't say we're its PDS, does nothing and
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returns False.
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Doesn't deliver anywhere externally! Relays will receive this record
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through ``subscribeRepos`` and then deliver it to AppView(s), which will
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notify recipients as necessary.
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"""
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if util.domain_from_link(url) not in DOMAINS:
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logger.info(f'Target PDS {url} is not us')
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return False
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# TODO: unify with Web.send into something like a SUPPORTED_TYPES
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# constant and handle that in Protocol.send_task or nearby?
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inner_type = as1.get_object(obj.as1).get('objectType') or ''
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if (obj.type in ('accept', 'add', 'question', 'undo')
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or inner_type in ('question',)):
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logger.info(f'Skipping {obj.type} {inner_type}, not supported in ATProto')
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return False
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# determine "base" object, if any
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type = as1.object_type(obj.as1)
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base_obj = obj
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if type in ('post', 'update', 'delete'):
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obj_as1 = as1.get_object(obj.as1)
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type = as1.object_type(obj_as1)
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# TODO: should we not load for deletes?
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base_obj = PROTOCOLS[obj.source_protocol].load(obj_as1['id'])
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if not base_obj:
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base_obj = obj
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# convert to Bluesky record; short circuits on error
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try:
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record = to_cls.convert(base_obj, fetch_blobs=True, from_user=from_user)
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except ValueError as e:
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logger.info(f'Skipping due to {e}')
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return False
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# find user
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from_cls = PROTOCOLS[obj.source_protocol]
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from_key = from_cls.actor_key(obj)
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if not from_key:
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logger.info(f"Couldn't find {obj.source_protocol} user for {obj.key}")
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return False
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# load user
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user = from_cls.get_or_create(from_key.id(), propagate=True)
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did = user.get_copy(ATProto)
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assert did
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logger.info(f'{user.key} is {did}')
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did_doc = to_cls.load(did, did_doc=True)
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pds = to_cls.pds_for(did_doc)
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if not pds or util.domain_from_link(pds) not in DOMAINS:
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logger.warning(f'{from_key} {did} PDS {pds} is not us')
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return False
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# load repo
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repo = arroba.server.storage.load_repo(did)
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assert repo
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repo.callback = lambda _: common.create_task(queue='atproto-commit')
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# non-commit operations:
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# * delete actor => tombstone repo
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# * flag => send report to mod service
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verb = obj.as1.get('verb')
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if verb == 'delete' and obj_as1['id'] == did:
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logger.info(f'Deleting bridged ATProto account {did} by tombstoning repo!')
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arroba.server.storage.tombstone_repo(repo)
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return True
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elif verb == 'flag':
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return to_cls.create_report(record, user)
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# write commit
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type = record['$type']
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lex_type = LEXICONS[type]['type']
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assert lex_type == 'record', f"Can't store {type} object of type {lex_type}"
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ndb.transactional()
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def write():
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match verb:
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case 'update':
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action = Action.UPDATE
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case 'delete':
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action = Action.DELETE
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case _:
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action = Action.CREATE
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rkey = next_tid()
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if verb in ('update', 'delete'):
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# load existing record, check that it's the same one
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copy = base_obj.get_copy(to_cls)
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assert copy
|
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copy_did, coll, rkey = parse_at_uri(copy)
|
|
assert copy_did == did, (copy_did, did)
|
|
assert coll == type, (coll, type)
|
|
|
|
logger.info(f'Storing ATProto {action} {type} {rkey}')
|
|
repo.apply_writes([Write(action=action, collection=type, rkey=rkey,
|
|
record=record)])
|
|
|
|
at_uri = f'at://{did}/{type}/{rkey}'
|
|
base_obj.add('copies', Target(uri=at_uri, protocol=to_cls.LABEL))
|
|
base_obj.put()
|
|
|
|
write()
|
|
return True
|
|
|
|
@classmethod
|
|
def load(cls, id, did_doc=False, **kwargs):
|
|
"""Thin wrapper that converts DIDs and bsky.app URLs to at:// URIs.
|
|
|
|
Args:
|
|
did_doc (bool): if True, loads and returns a DID document object
|
|
instead of an ``app.bsky.actor.profile/self``.
|
|
"""
|
|
if id.startswith('did:') and not did_doc:
|
|
id = ids.profile_id(id=id, proto=cls)
|
|
|
|
elif id.startswith('https://bsky.app/'):
|
|
try:
|
|
id = bluesky.web_url_to_at_uri(id)
|
|
except ValueError as e:
|
|
logger.warning(f"Couldn't convert {id} to at:// URI: {e}")
|
|
return None
|
|
|
|
return super().load(id, **kwargs)
|
|
|
|
@classmethod
|
|
def fetch(cls, obj, **kwargs):
|
|
"""Tries to fetch a ATProto object.
|
|
|
|
Args:
|
|
obj (models.Object): with the id to fetch. Fills data into the ``as2``
|
|
property.
|
|
kwargs: ignored
|
|
|
|
Returns:
|
|
bool: True if the object was fetched and populated successfully,
|
|
False otherwise
|
|
"""
|
|
id = obj.key.id()
|
|
if not cls.owns_id(id):
|
|
logger.info(f"ATProto can't fetch {id}")
|
|
return False
|
|
|
|
assert not id.startswith('https://bsky.app/') # handled in load
|
|
|
|
# did:plc, did:web
|
|
if id.startswith('did:'):
|
|
try:
|
|
obj.raw = did.resolve(id, get_fn=util.requests_get)
|
|
return True
|
|
except (ValueError, requests.RequestException) as e:
|
|
util.interpret_http_exception(e)
|
|
return False
|
|
|
|
# at:// URI. if it has a handle, resolve and replace with DID.
|
|
# examples:
|
|
# at://did:plc:s2koow7r6t7tozgd4slc3dsg/app.bsky.feed.post/3jqcpv7bv2c2q
|
|
# https://bsky.social/xrpc/com.atproto.repo.getRecord?repo=did:plc:s2koow7r6t7tozgd4slc3dsg&collection=app.bsky.feed.post&rkey=3jqcpv7bv2c2q
|
|
repo, collection, rkey = parse_at_uri(id)
|
|
if not repo.startswith('did:'):
|
|
handle = repo
|
|
repo = cls.handle_to_id(repo)
|
|
if not repo:
|
|
return False
|
|
assert repo.startswith('did:')
|
|
obj.key = ndb.Key(Object, id.replace(f'at://{handle}', f'at://{repo}'))
|
|
|
|
try:
|
|
appview.address = f'https://{os.environ["APPVIEW_HOST"]}'
|
|
ret = appview.com.atproto.repo.getRecord(
|
|
repo=repo, collection=collection, rkey=rkey)
|
|
except RequestException as e:
|
|
util.interpret_http_exception(e)
|
|
return False
|
|
|
|
# TODO: verify sig?
|
|
obj.bsky = {
|
|
**ret['value'],
|
|
'cid': ret.get('cid'),
|
|
}
|
|
return True
|
|
|
|
@classmethod
|
|
def _convert(cls, obj, fetch_blobs=False, from_user=None):
|
|
"""Converts a :class:`models.Object` to ``app.bsky.*`` lexicon JSON.
|
|
|
|
Args:
|
|
obj (models.Object)
|
|
fetch_blobs (bool): whether to fetch images and other blobs, store
|
|
them in :class:`arroba.datastore_storage.AtpRemoteBlob`\s if they
|
|
don't already exist, and fill them into the returned object.
|
|
from_user (models.User): user (actor) this activity/object is from
|
|
|
|
Returns:
|
|
dict: JSON object
|
|
"""
|
|
from_proto = PROTOCOLS.get(obj.source_protocol)
|
|
|
|
if obj.bsky:
|
|
return obj.bsky
|
|
|
|
if not obj.as1:
|
|
return {}
|
|
|
|
blobs = {} # maps str URL to dict blob object
|
|
if fetch_blobs:
|
|
for o in obj.as1, as1.get_object(obj.as1):
|
|
for url in util.get_urls(o, 'image'):
|
|
if url not in blobs:
|
|
blob = AtpRemoteBlob.get_or_create(
|
|
url=url, get_fn=util.requests_get)
|
|
blobs[url] = blob.as_object()
|
|
|
|
# convert! using our records in the datastore and fetching code instead
|
|
# of granary's
|
|
client = DatastoreClient(f'https://{os.environ["APPVIEW_HOST"]}')
|
|
try:
|
|
ret = bluesky.from_as1(cls.translate_ids(obj.as1), blobs=blobs,
|
|
client=client)
|
|
except (ValueError, RequestException):
|
|
logger.error(f"Couldn't convert to ATProto", exc_info=True)
|
|
return {}
|
|
|
|
# bridged actors get a self label
|
|
if ret['$type'] == 'app.bsky.actor.profile' and from_proto != ATProto:
|
|
label_val = 'bridged-from-bridgy-fed'
|
|
if from_proto:
|
|
label_val += f'-{from_proto.LABEL}'
|
|
ret.setdefault('labels', {'$type': 'com.atproto.label.defs#selfLabels'})
|
|
ret['labels'].setdefault('values', []).append({'val' : label_val})
|
|
|
|
return ret
|
|
|
|
@classmethod
|
|
def create_report(cls, input, from_user):
|
|
"""Sends a ``createReport`` for a ``flag`` activity.
|
|
|
|
Args:
|
|
input (dict): ``createReport`` input
|
|
from_user (models.User): user (actor) this flag is from
|
|
|
|
Returns:
|
|
bool: True if the report was sent successfully, False if the flag's
|
|
actor is not bridged into ATProto
|
|
"""
|
|
assert input['$type'] == 'com.atproto.moderation.createReport#input'
|
|
|
|
repo_did = from_user.get_copy(ATProto)
|
|
if not repo_did:
|
|
return False
|
|
repo = arroba.server.storage.load_repo(repo_did)
|
|
mod_host = os.environ['MOD_SERVICE_HOST']
|
|
token = service_jwt(host=mod_host,
|
|
aud=os.environ['MOD_SERVICE_DID'],
|
|
repo_did=repo_did,
|
|
privkey=repo.signing_key)
|
|
|
|
client = Client(f'https://{mod_host}', truncate=True,
|
|
headers={'User-Agent': USER_AGENT})
|
|
output = client.com.atproto.moderation.createReport(input)
|
|
logger.info(f'Created report on {mod_host}: {json_dumps(output)}')
|
|
return True
|