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Handle out-of-order Delete activity

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This commit is contained in:
Thomas Sileo 2022-07-26 21:10:59 +02:00
parent 23832574bc
commit 064921fdd1
5 changed files with 222 additions and 19 deletions
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2
app/activitypub.py
View file

@ -261,7 +261,7 @@ async def get_object(activity: RawObject) -> RawObject:
def wrap_object(activity: RawObject) -> RawObject:
# TODO(ts): improve Create VS Update
# TODO(tsileo): improve Create VS Update with a `update=True` flag
if "updated" in activity:
return {
"@context": AS_EXTENDED_CTX,

77
app/boxes.py
View file

@ -654,6 +654,25 @@ async def get_inbox_object_by_ap_id(
).scalar_one_or_none() # type: ignore
async def get_inbox_delete_for_activity_object_ap_id(
db_session: AsyncSession, activity_object_ap_id: str
) -> models.InboxObject | None:
return (
await db_session.execute(
select(models.InboxObject)
.where(
models.InboxObject.ap_type == "Delete",
models.InboxObject.activity_object_ap_id == activity_object_ap_id,
)
.options(
joinedload(models.InboxObject.actor),
joinedload(models.InboxObject.relates_to_inbox_object),
joinedload(models.InboxObject.relates_to_outbox_object),
)
)
).scalar_one_or_none() # type: ignore
async def get_outbox_object_by_ap_id(
db_session: AsyncSession, ap_id: str
) -> models.OutboxObject | None:
@ -695,8 +714,16 @@ async def _handle_delete_activity(
db_session: AsyncSession,
from_actor: models.Actor,
delete_activity: models.InboxObject,
ap_object_to_delete: models.InboxObject,
ap_object_to_delete: models.InboxObject | None,
) -> None:
if ap_object_to_delete is None:
logger.info(
"Received Delete for an unknown object "
f"{delete_activity.activity_object_ap_id}"
)
# TODO(tsileo): support deleting actor
return
if from_actor.ap_id != ap_object_to_delete.actor.ap_id:
logger.warning(
"Actor mismatch between the activity and the object: "
@ -724,11 +751,18 @@ async def _handle_delete_activity(
logger.info(f"Deleting {ap_object_to_delete.ap_type}/{ap_object_to_delete.ap_id}")
ap_object_to_delete.is_deleted = True
await _revert_side_effect_for_deleted_object(db_session, ap_object_to_delete)
async def _revert_side_effect_for_deleted_object(
db_session: AsyncSession,
deleted_ap_object: models.InboxObject,
) -> None:
# Decrement the replies counter if needed
if ap_object_to_delete.in_reply_to:
if deleted_ap_object.in_reply_to:
replied_object = await get_anybox_object_by_ap_id(
db_session,
ap_object_to_delete.in_reply_to,
deleted_ap_object.in_reply_to,
)
if replied_object:
if replied_object.is_from_outbox:
@ -928,6 +962,24 @@ async def _handle_create_activity(
raise ValueError("Object actor does not match activity")
ro = RemoteObject(wrapped_object, actor=from_actor)
# Check if we already received a delete for this object (happens often
# with forwarded replies)
delete_object = await get_inbox_delete_for_activity_object_ap_id(
db_session,
ro.ap_id,
)
if delete_object:
if delete_object.actor.ap_id != from_actor.ap_id:
logger.warning(
f"Got a Delete for {ro.ap_id} from {delete_object.actor.ap_id}??"
)
else:
logger.info("Got a Delete for this object, deleting activity")
create_activity.is_deleted = True
await db_session.flush()
return None
await _process_note_object(db_session, create_activity, from_actor, ro)
@ -1251,19 +1303,12 @@ async def save_to_inbox(
elif activity_ro.ap_type == "Update":
await _handle_update_activity(db_session, actor, inbox_object)
elif activity_ro.ap_type == "Delete":
if relates_to_inbox_object:
await _handle_delete_activity(
db_session,
actor,
inbox_object,
relates_to_inbox_object,
)
else:
# TODO(ts): handle delete actor
logger.info(
"Received a Delete for an unknown object: "
f"{activity_ro.activity_object_ap_id}"
)
await _handle_delete_activity(
db_session,
actor,
inbox_object,
relates_to_inbox_object,
)
elif activity_ro.ap_type == "Follow":
await _handle_follow_follow_activity(db_session, actor, inbox_object)
elif activity_ro.ap_type == "Undo":

31
tests/factories.py
View file

@ -36,6 +36,24 @@ def build_follow_activity(
}
def build_delete_activity(
from_remote_actor: actor.RemoteActor | models.Actor,
deleted_object_ap_id: str,
outbox_public_id: str | None = None,
) -> ap.RawObject:
return {
"@context": ap.AS_CTX,
"type": "Delete",
"id": (
from_remote_actor.ap_id # type: ignore
+ "/follow/"
+ (outbox_public_id or uuid4().hex)
),
"actor": from_remote_actor.ap_id,
"object": deleted_object_ap_id,
}
def build_accept_activity(
from_remote_actor: actor.RemoteActor,
for_remote_object: RemoteObject,
@ -80,6 +98,19 @@ def build_note_object(
}
def build_create_activity(obj: ap.RawObject) -> ap.RawObject:
return {
"@context": ap.AS_EXTENDED_CTX,
"actor": obj["attributedTo"],
"to": obj.get("to", []),
"cc": obj.get("cc", []),
"id": obj["id"] + "/activity",
"object": ap.remove_context(obj),
"published": obj["published"],
"type": "Create",
}
class BaseModelMeta:
sqlalchemy_session = _Session
sqlalchemy_session_persistence = "commit"

115
tests/test_inbox.py
View file

@ -3,6 +3,7 @@ from uuid import uuid4
import httpx
import respx
from fastapi.testclient import TestClient
from sqlalchemy import select
from sqlalchemy.orm import Session
from app import activitypub as ap
@ -13,7 +14,9 @@ from app.incoming_activities import process_next_incoming_activity
from tests import factories
from tests.utils import mock_httpsig_checker
from tests.utils import run_async
from tests.utils import setup_inbox_delete
from tests.utils import setup_remote_actor
from tests.utils import setup_remote_actor_as_follower
def test_inbox_requires_httpsig(
@ -41,7 +44,7 @@ def test_inbox_follow_request(
)
respx_mock.get(ra.ap_id).mock(return_value=httpx.Response(200, json=ra.ap_actor))
# When sending a Follow activity
# When receiving a Follow activity
follow_activity = RemoteObject(
factories.build_follow_activity(
from_remote_actor=ra,
@ -108,7 +111,7 @@ def test_inbox_accept_follow_request(
follow_id, follow_from_outbox
)
# When sending a Accept activity
# When receiving a Accept activity
accept_activity = RemoteObject(
factories.build_accept_activity(
from_remote_actor=ra,
@ -137,3 +140,111 @@ def test_inbox_accept_follow_request(
# And a following entry was created internally
following = db.query(models.Following).one()
assert following.ap_actor_id == actor_in_db.ap_id
def test_inbox__create_from_follower(
db: Session,
client: TestClient,
respx_mock: respx.MockRouter,
) -> None:
# Given a remote actor
ra = setup_remote_actor(respx_mock)
# Who is also a follower
setup_remote_actor_as_follower(ra)
create_activity = factories.build_create_activity(
factories.build_note_object(
from_remote_actor=ra,
outbox_public_id=str(uuid4()),
content="Hello",
to=[LOCAL_ACTOR.ap_id],
)
)
# When receiving a Create activity
ro = RemoteObject(create_activity, ra)
with mock_httpsig_checker(ra):
response = client.post(
"/inbox",
headers={"Content-Type": ap.AS_CTX},
json=ro.ap_object,
)
# Then the server returns a 204
assert response.status_code == 202
# And when processing the incoming activity
run_async(process_next_incoming_activity)
# Then the Create activity was saved
create_activity_from_inbox: models.InboxObject | None = db.execute(
select(models.InboxObject).where(models.InboxObject.ap_type == "Create")
).scalar_one_or_none()
assert create_activity_from_inbox
assert create_activity_from_inbox.ap_id == ro.ap_id
# And the Note object was created
note_activity_from_inbox: models.InboxObject | None = db.execute(
select(models.InboxObject).where(models.InboxObject.ap_type == "Note")
).scalar_one_or_none()
assert note_activity_from_inbox
assert note_activity_from_inbox.ap_id == ro.activity_object_ap_id
def test_inbox__create_already_deleted_object(
db: Session,
client: TestClient,
respx_mock: respx.MockRouter,
) -> None:
# Given a remote actor
ra = setup_remote_actor(respx_mock)
# Who is also a follower
follower = setup_remote_actor_as_follower(ra)
# And a Create activity for a Note object
create_activity = factories.build_create_activity(
factories.build_note_object(
from_remote_actor=ra,
outbox_public_id=str(uuid4()),
content="Hello",
to=[LOCAL_ACTOR.ap_id],
)
)
ro = RemoteObject(create_activity, ra)
# And a Delete activity received for the create object
setup_inbox_delete(follower.actor, ro.activity_object_ap_id) # type: ignore
# When receiving a Create activity
with mock_httpsig_checker(ra):
response = client.post(
"/inbox",
headers={"Content-Type": ap.AS_CTX},
json=ro.ap_object,
)
# Then the server returns a 204
assert response.status_code == 202
# And when processing the incoming activity
run_async(process_next_incoming_activity)
# Then the Create activity was saved
create_activity_from_inbox: models.InboxObject | None = db.execute(
select(models.InboxObject).where(models.InboxObject.ap_type == "Create")
).scalar_one_or_none()
assert create_activity_from_inbox
assert create_activity_from_inbox.ap_id == ro.ap_id
# But it has the deleted flag
assert create_activity_from_inbox.is_deleted is True
# And the Note wasn't created
assert (
db.execute(
select(models.InboxObject).where(models.InboxObject.ap_type == "Note")
).scalar_one_or_none()
is None
)

16
tests/utils.py
View file

@ -73,6 +73,22 @@ def setup_remote_actor_as_follower(ra: actor.RemoteActor) -> models.Follower:
return follower
def setup_inbox_delete(
actor: models.Actor, deleted_object_ap_id: str
) -> models.InboxObject:
follow_from_inbox = RemoteObject(
factories.build_delete_activity(
from_remote_actor=actor,
deleted_object_ap_id=deleted_object_ap_id,
),
actor,
)
inbox_object = factories.InboxObjectFactory.from_remote_object(
follow_from_inbox, actor
)
return inbox_object
def run_async(func, *args, **kwargs):
async def _func():
async with async_session() as db: