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Support MSC3814: Dehydrated Devices Part 2 (#16010)

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8 changed files with 258 additions and 101 deletions
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1
changelog.d/16010.misc Normal file
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@ -0,0 +1 @@
Update dehydrated devices implementation.

14
synapse/handlers/device.py
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@ -385,6 +385,7 @@ class DeviceHandler(DeviceWorkerHandler):
self.federation_sender = hs.get_federation_sender()
self._account_data_handler = hs.get_account_data_handler()
self._storage_controllers = hs.get_storage_controllers()
self.db_pool = hs.get_datastores().main.db_pool
self.device_list_updater = DeviceListUpdater(hs, self)
@ -656,15 +657,17 @@ class DeviceHandler(DeviceWorkerHandler):
device_id: Optional[str],
device_data: JsonDict,
initial_device_display_name: Optional[str] = None,
keys_for_device: Optional[JsonDict] = None,
) -> str:
"""Store a dehydrated device for a user. If the user had a previous
dehydrated device, it is removed.
"""Store a dehydrated device for a user, optionally storing the keys associated with
it as well. If the user had a previous dehydrated device, it is removed.
Args:
user_id: the user that we are storing the device for
device_id: device id supplied by client
device_data: the dehydrated device information
initial_device_display_name: The display name to use for the device
keys_for_device: keys for the dehydrated device
Returns:
device id of the dehydrated device
"""
@ -673,11 +676,16 @@ class DeviceHandler(DeviceWorkerHandler):
device_id,
initial_device_display_name,
)
time_now = self.clock.time_msec()
old_device_id = await self.store.store_dehydrated_device(
user_id, device_id, device_data
user_id, device_id, device_data, time_now, keys_for_device
)
if old_device_id is not None:
await self.delete_devices(user_id, [old_device_id])
return device_id
async def rehydrate_device(

13
synapse/handlers/devicemessage.py
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@ -367,19 +367,6 @@ class DeviceMessageHandler:
errcode=Codes.INVALID_PARAM,
)
# if we have a since token, delete any to-device messages before that token
# (since we now know that the device has received them)
deleted = await self.store.delete_messages_for_device(
user_id, device_id, since_stream_id
)
logger.debug(
"Deleted %d to-device messages up to %d for user_id %s device_id %s",
deleted,
since_stream_id,
user_id,
device_id,
)
to_token = self.event_sources.get_current_token().to_device_key
messages, stream_id = await self.store.get_messages_for_device(

16
synapse/rest/client/devices.py
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@ -29,7 +29,6 @@ from synapse.http.servlet import (
parse_integer,
)
from synapse.http.site import SynapseRequest
from synapse.replication.http.devices import ReplicationUploadKeysForUserRestServlet
from synapse.rest.client._base import client_patterns, interactive_auth_handler
from synapse.rest.client.models import AuthenticationData
from synapse.rest.models import RequestBodyModel
@ -480,13 +479,6 @@ class DehydratedDeviceV2Servlet(RestServlet):
self.e2e_keys_handler = hs.get_e2e_keys_handler()
self.device_handler = handler
if hs.config.worker.worker_app is None:
# if main process
self.key_uploader = self.e2e_keys_handler.upload_keys_for_user
else:
# then a worker
self.key_uploader = ReplicationUploadKeysForUserRestServlet.make_client(hs)
async def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
requester = await self.auth.get_user_by_req(request)
@ -549,18 +541,12 @@ class DehydratedDeviceV2Servlet(RestServlet):
"Device key(s) not found, these must be provided.",
)
# TODO: Those two operations, creating a device and storing the
# device's keys should be atomic.
device_id = await self.device_handler.store_dehydrated_device(
requester.user.to_string(),
submission.device_id,
submission.device_data.dict(),
submission.initial_device_display_name,
)
# TODO: Do we need to do something with the result here?
await self.key_uploader(
user_id=user_id, device_id=submission.device_id, keys=submission.dict()
device_info,
)
return 200, {"device_id": device_id}

51
synapse/storage/databases/main/devices.py
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@ -28,6 +28,7 @@ from typing import (
cast,
)
from canonicaljson import encode_canonical_json
from typing_extensions import Literal
from synapse.api.constants import EduTypes
@ -1188,8 +1189,42 @@ class DeviceWorkerStore(RoomMemberWorkerStore, EndToEndKeyWorkerStore):
)
def _store_dehydrated_device_txn(
self, txn: LoggingTransaction, user_id: str, device_id: str, device_data: str
self,
txn: LoggingTransaction,
user_id: str,
device_id: str,
device_data: str,
time: int,
keys: Optional[JsonDict] = None,
) -> Optional[str]:
# TODO: make keys non-optional once support for msc2697 is dropped
if keys:
device_keys = keys.get("device_keys", None)
if device_keys:
# Type ignore - this function is defined on EndToEndKeyStore which we do
# have access to due to hs.get_datastore() "magic"
self._set_e2e_device_keys_txn( # type: ignore[attr-defined]
txn, user_id, device_id, time, device_keys
)
one_time_keys = keys.get("one_time_keys", None)
if one_time_keys:
key_list = []
for key_id, key_obj in one_time_keys.items():
algorithm, key_id = key_id.split(":")
key_list.append(
(
algorithm,
key_id,
encode_canonical_json(key_obj).decode("ascii"),
)
)
self._add_e2e_one_time_keys_txn(txn, user_id, device_id, time, key_list)
fallback_keys = keys.get("fallback_keys", None)
if fallback_keys:
self._set_e2e_fallback_keys_txn(txn, user_id, device_id, fallback_keys)
old_device_id = self.db_pool.simple_select_one_onecol_txn(
txn,
table="dehydrated_devices",
@ -1203,10 +1238,16 @@ class DeviceWorkerStore(RoomMemberWorkerStore, EndToEndKeyWorkerStore):
keyvalues={"user_id": user_id},
values={"device_id": device_id, "device_data": device_data},
)
return old_device_id
async def store_dehydrated_device(
self, user_id: str, device_id: str, device_data: JsonDict
self,
user_id: str,
device_id: str,
device_data: JsonDict,
time_now: int,
keys: Optional[dict] = None,
) -> Optional[str]:
"""Store a dehydrated device for a user.
@ -1214,15 +1255,21 @@ class DeviceWorkerStore(RoomMemberWorkerStore, EndToEndKeyWorkerStore):
user_id: the user that we are storing the device for
device_id: the ID of the dehydrated device
device_data: the dehydrated device information
time_now: current time at the request in milliseconds
keys: keys for the dehydrated device
Returns:
device id of the user's previous dehydrated device, if any
"""
return await self.db_pool.runInteraction(
"store_dehydrated_device_txn",
self._store_dehydrated_device_txn,
user_id,
device_id,
json_encoder.encode(device_data),
time_now,
keys,
)
async def remove_dehydrated_device(self, user_id: str, device_id: str) -> bool:

178
synapse/storage/databases/main/end_to_end_keys.py
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@ -522,36 +522,57 @@ class EndToEndKeyWorkerStore(EndToEndKeyBackgroundStore, CacheInvalidationWorker
new_keys: keys to add - each a tuple of (algorithm, key_id, key json)
"""
def _add_e2e_one_time_keys(txn: LoggingTransaction) -> None:
set_tag("user_id", user_id)
set_tag("device_id", device_id)
set_tag("new_keys", str(new_keys))
# We are protected from race between lookup and insertion due to
# a unique constraint. If there is a race of two calls to
# `add_e2e_one_time_keys` then they'll conflict and we will only
# insert one set.
self.db_pool.simple_insert_many_txn(
txn,
table="e2e_one_time_keys_json",
keys=(
"user_id",
"device_id",
"algorithm",
"key_id",
"ts_added_ms",
"key_json",
),
values=[
(user_id, device_id, algorithm, key_id, time_now, json_bytes)
for algorithm, key_id, json_bytes in new_keys
],
)
self._invalidate_cache_and_stream(
txn, self.count_e2e_one_time_keys, (user_id, device_id)
)
await self.db_pool.runInteraction(
"add_e2e_one_time_keys_insert", _add_e2e_one_time_keys
"add_e2e_one_time_keys_insert",
self._add_e2e_one_time_keys_txn,
user_id,
device_id,
time_now,
new_keys,
)
def _add_e2e_one_time_keys_txn(
self,
txn: LoggingTransaction,
user_id: str,
device_id: str,
time_now: int,
new_keys: Iterable[Tuple[str, str, str]],
) -> None:
"""Insert some new one time keys for a device. Errors if any of the keys already exist.
Args:
user_id: id of user to get keys for
device_id: id of device to get keys for
time_now: insertion time to record (ms since epoch)
new_keys: keys to add - each a tuple of (algorithm, key_id, key json) - note
that the key JSON must be in canonical JSON form
"""
set_tag("user_id", user_id)
set_tag("device_id", device_id)
set_tag("new_keys", str(new_keys))
# We are protected from race between lookup and insertion due to
# a unique constraint. If there is a race of two calls to
# `add_e2e_one_time_keys` then they'll conflict and we will only
# insert one set.
self.db_pool.simple_insert_many_txn(
txn,
table="e2e_one_time_keys_json",
keys=(
"user_id",
"device_id",
"algorithm",
"key_id",
"ts_added_ms",
"key_json",
),
values=[
(user_id, device_id, algorithm, key_id, time_now, json_bytes)
for algorithm, key_id, json_bytes in new_keys
],
)
self._invalidate_cache_and_stream(
txn, self.count_e2e_one_time_keys, (user_id, device_id)
)
@cached(max_entries=10000)
@ -723,6 +744,14 @@ class EndToEndKeyWorkerStore(EndToEndKeyBackgroundStore, CacheInvalidationWorker
device_id: str,
fallback_keys: JsonDict,
) -> None:
"""Set the user's e2e fallback keys.
Args:
user_id: the user whose keys are being set
device_id: the device whose keys are being set
fallback_keys: the keys to set. This is a map from key ID (which is
of the form "algorithm:id") to key data.
"""
# fallback_keys will usually only have one item in it, so using a for
# loop (as opposed to calling simple_upsert_many_txn) won't be too bad
# FIXME: make sure that only one key per algorithm is uploaded
@ -1304,43 +1333,70 @@ class EndToEndKeyStore(EndToEndKeyWorkerStore, SQLBaseStore):
) -> bool:
"""Stores device keys for a device. Returns whether there was a change
or the keys were already in the database.
Args:
user_id: user_id of the user to store keys for
device_id: device_id of the device to store keys for
time_now: time at the request to store the keys
device_keys: the keys to store
"""
def _set_e2e_device_keys_txn(txn: LoggingTransaction) -> bool:
set_tag("user_id", user_id)
set_tag("device_id", device_id)
set_tag("time_now", time_now)
set_tag("device_keys", str(device_keys))
old_key_json = self.db_pool.simple_select_one_onecol_txn(
txn,
table="e2e_device_keys_json",
keyvalues={"user_id": user_id, "device_id": device_id},
retcol="key_json",
allow_none=True,
)
# In py3 we need old_key_json to match new_key_json type. The DB
# returns unicode while encode_canonical_json returns bytes.
new_key_json = encode_canonical_json(device_keys).decode("utf-8")
if old_key_json == new_key_json:
log_kv({"Message": "Device key already stored."})
return False
self.db_pool.simple_upsert_txn(
txn,
table="e2e_device_keys_json",
keyvalues={"user_id": user_id, "device_id": device_id},
values={"ts_added_ms": time_now, "key_json": new_key_json},
)
log_kv({"message": "Device keys stored."})
return True
return await self.db_pool.runInteraction(
"set_e2e_device_keys", _set_e2e_device_keys_txn
"set_e2e_device_keys",
self._set_e2e_device_keys_txn,
user_id,
device_id,
time_now,
device_keys,
)
def _set_e2e_device_keys_txn(
self,
txn: LoggingTransaction,
user_id: str,
device_id: str,
time_now: int,
device_keys: JsonDict,
) -> bool:
"""Stores device keys for a device. Returns whether there was a change
or the keys were already in the database.
Args:
user_id: user_id of the user to store keys for
device_id: device_id of the device to store keys for
time_now: time at the request to store the keys
device_keys: the keys to store
"""
set_tag("user_id", user_id)
set_tag("device_id", device_id)
set_tag("time_now", time_now)
set_tag("device_keys", str(device_keys))
old_key_json = self.db_pool.simple_select_one_onecol_txn(
txn,
table="e2e_device_keys_json",
keyvalues={"user_id": user_id, "device_id": device_id},
retcol="key_json",
allow_none=True,
)
# In py3 we need old_key_json to match new_key_json type. The DB
# returns unicode while encode_canonical_json returns bytes.
new_key_json = encode_canonical_json(device_keys).decode("utf-8")
if old_key_json == new_key_json:
log_kv({"Message": "Device key already stored."})
return False
self.db_pool.simple_upsert_txn(
txn,
table="e2e_device_keys_json",
keyvalues={"user_id": user_id, "device_id": device_id},
values={"ts_added_ms": time_now, "key_json": new_key_json},
)
log_kv({"message": "Device keys stored."})
return True
async def delete_e2e_keys_by_device(self, user_id: str, device_id: str) -> None:
def delete_e2e_keys_by_device_txn(txn: LoggingTransaction) -> None:
log_kv(

9
tests/handlers/test_device.py
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@ -566,15 +566,16 @@ class DehydrationTestCase(unittest.HomeserverTestCase):
self.assertEqual(len(res["events"]), 1)
self.assertEqual(res["events"][0]["content"]["body"], "foo")
# Fetch the message of the dehydrated device again, which should return nothing
# and delete the old messages
# Fetch the message of the dehydrated device again, which should return
# the same message as it has not been deleted
res = self.get_success(
self.message_handler.get_events_for_dehydrated_device(
requester=requester,
device_id=stored_dehydrated_device_id,
since_token=res["next_batch"],
since_token=None,
limit=10,
)
)
self.assertTrue(len(res["next_batch"]) > 1)
self.assertEqual(len(res["events"]), 0)
self.assertEqual(len(res["events"]), 1)
self.assertEqual(res["events"][0]["content"]["body"], "foo")

77
tests/rest/client/test_devices.py
View File

@ -20,7 +20,7 @@ from synapse.api.errors import NotFoundError
from synapse.rest import admin, devices, room, sync
from synapse.rest.client import account, keys, login, register
from synapse.server import HomeServer
from synapse.types import JsonDict, create_requester
from synapse.types import JsonDict, UserID, create_requester
from synapse.util import Clock
from tests import unittest
@ -282,6 +282,17 @@ class DehydratedDeviceTestCase(unittest.HomeserverTestCase):
"<user_id>": {"<algorithm>:<device_id>": "<signature_base64>"}
},
},
"fallback_keys": {
"alg1:device1": "f4llb4ckk3y",
"signed_<algorithm>:<device_id>": {
"fallback": "true",
"key": "f4llb4ckk3y",
"signatures": {
"<user_id>": {"<algorithm>:<device_id>": "<key_base64>"}
},
},
},
"one_time_keys": {"alg1:k1": "0net1m3k3y"},
}
channel = self.make_request(
"PUT",
@ -312,6 +323,55 @@ class DehydratedDeviceTestCase(unittest.HomeserverTestCase):
}
self.assertEqual(device_data, expected_device_data)
# test that the keys are correctly uploaded
channel = self.make_request(
"POST",
"/_matrix/client/r0/keys/query",
{
"device_keys": {
user: ["device1"],
},
},
token,
)
self.assertEqual(channel.code, 200)
self.assertEqual(
channel.json_body["device_keys"][user][device_id]["keys"],
content["device_keys"]["keys"],
)
# first claim should return the onetime key we uploaded
res = self.get_success(
self.hs.get_e2e_keys_handler().claim_one_time_keys(
{user: {device_id: {"alg1": 1}}},
UserID.from_string(user),
timeout=None,
always_include_fallback_keys=False,
)
)
self.assertEqual(
res,
{
"failures": {},
"one_time_keys": {user: {device_id: {"alg1:k1": "0net1m3k3y"}}},
},
)
# second claim should return fallback key
res2 = self.get_success(
self.hs.get_e2e_keys_handler().claim_one_time_keys(
{user: {device_id: {"alg1": 1}}},
UserID.from_string(user),
timeout=None,
always_include_fallback_keys=False,
)
)
self.assertEqual(
res2,
{
"failures": {},
"one_time_keys": {user: {device_id: {"alg1:device1": "f4llb4ckk3y"}}},
},
)
# create another device for the user
(
new_device_id,
@ -348,10 +408,21 @@ class DehydratedDeviceTestCase(unittest.HomeserverTestCase):
self.assertEqual(channel.code, 200)
expected_content = {"body": "test_message"}
self.assertEqual(channel.json_body["events"][0]["content"], expected_content)
# fetch messages again and make sure that the message was not deleted
channel = self.make_request(
"POST",
f"_matrix/client/unstable/org.matrix.msc3814.v1/dehydrated_device/{device_id}/events",
content={},
access_token=token,
shorthand=False,
)
self.assertEqual(channel.code, 200)
self.assertEqual(channel.json_body["events"][0]["content"], expected_content)
next_batch_token = channel.json_body.get("next_batch")
# fetch messages again and make sure that the message was deleted and we are returned an
# empty array
# make sure fetching messages with next batch token works - there are no unfetched
# messages so we should receive an empty array
content = {"next_batch": next_batch_token}
channel = self.make_request(
"POST",