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// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package consumers
import (
"context"
"encoding/json"
"github.com/getsentry/sentry-go"
"github.com/matrix-org/dendrite/keyserver/api"
roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/setup/config"
"github.com/matrix-org/dendrite/setup/jetstream"
"github.com/matrix-org/dendrite/setup/process"
"github.com/matrix-org/dendrite/syncapi/notifier"
"github.com/matrix-org/dendrite/syncapi/storage"
"github.com/matrix-org/dendrite/syncapi/types"
"github.com/matrix-org/gomatrixserverlib"
"github.com/nats-io/nats.go"
"github.com/sirupsen/logrus"
)
// OutputKeyChangeEventConsumer consumes events that originated in the key server.
type OutputKeyChangeEventConsumer struct {
ctx context.Context
jetstream nats.JetStreamContext
durable string
topic string
db storage.Database
notifier *notifier.Notifier
stream types.StreamProvider
serverName gomatrixserverlib.ServerName // our server name
rsAPI roomserverAPI.SyncRoomserverAPI
}
// NewOutputKeyChangeEventConsumer creates a new OutputKeyChangeEventConsumer.
// Call Start() to begin consuming from the key server.
func NewOutputKeyChangeEventConsumer(
process *process.ProcessContext,
cfg *config.SyncAPI,
topic string,
js nats.JetStreamContext,
rsAPI roomserverAPI.SyncRoomserverAPI,
store storage.Database,
notifier *notifier.Notifier,
stream types.StreamProvider,
) *OutputKeyChangeEventConsumer {
s := &OutputKeyChangeEventConsumer{
ctx: process.Context(),
jetstream: js,
durable: cfg.Matrix.JetStream.Durable("SyncAPIKeyChangeConsumer"),
topic: topic,
db: store,
serverName: cfg.Matrix.ServerName,
rsAPI: rsAPI,
notifier: notifier,
stream: stream,
}
return s
}
// Start consuming from the key server
func (s *OutputKeyChangeEventConsumer) Start() error {
return jetstream.JetStreamConsumer(
s.ctx, s.jetstream, s.topic, s.durable, 1,
s.onMessage, nats.DeliverAll(), nats.ManualAck(),
)
}
func (s *OutputKeyChangeEventConsumer) onMessage(ctx context.Context, msgs []*nats.Msg) bool {
msg := msgs[0] // Guaranteed to exist if onMessage is called
var m api.DeviceMessage
if err := json.Unmarshal(msg.Data, &m); err != nil {
logrus.WithError(err).Errorf("failed to read device message from key change topic")
return true
}
if m.DeviceKeys == nil && m.OutputCrossSigningKeyUpdate == nil {
// This probably shouldn't happen but stops us from panicking if we come
// across an update that doesn't satisfy either types.
return true
}
switch m.Type {
case api.TypeCrossSigningUpdate:
return s.onCrossSigningMessage(m, m.DeviceChangeID)
case api.TypeDeviceKeyUpdate:
fallthrough
default:
return s.onDeviceKeyMessage(m, m.DeviceChangeID)
}
}
func (s *OutputKeyChangeEventConsumer) onDeviceKeyMessage(m api.DeviceMessage, deviceChangeID int64) bool {
if m.DeviceKeys == nil {
return true
}
output := m.DeviceKeys
// work out who we need to notify about the new key
var queryRes roomserverAPI.QuerySharedUsersResponse
err := s.rsAPI.QuerySharedUsers(s.ctx, &roomserverAPI.QuerySharedUsersRequest{
UserID: output.UserID,
}, &queryRes)
if err != nil {
logrus.WithError(err).Error("syncapi: failed to QuerySharedUsers for key change event from key server")
sentry.CaptureException(err)
return true
}
// make sure we get our own key updates too!
queryRes.UserIDsToCount[output.UserID] = 1
posUpdate := types.StreamPosition(deviceChangeID)
s.stream.Advance(posUpdate)
for userID := range queryRes.UserIDsToCount {
s.notifier.OnNewKeyChange(types.StreamingToken{DeviceListPosition: posUpdate}, userID, output.UserID)
}
return true
}
func (s *OutputKeyChangeEventConsumer) onCrossSigningMessage(m api.DeviceMessage, deviceChangeID int64) bool {
output := m.CrossSigningKeyUpdate
// work out who we need to notify about the new key
var queryRes roomserverAPI.QuerySharedUsersResponse
err := s.rsAPI.QuerySharedUsers(s.ctx, &roomserverAPI.QuerySharedUsersRequest{
UserID: output.UserID,
}, &queryRes)
if err != nil {
logrus.WithError(err).Error("syncapi: failed to QuerySharedUsers for key change event from key server")
sentry.CaptureException(err)
return true
}
// make sure we get our own key updates too!
queryRes.UserIDsToCount[output.UserID] = 1
posUpdate := types.StreamPosition(deviceChangeID)
s.stream.Advance(posUpdate)
for userID := range queryRes.UserIDsToCount {
s.notifier.OnNewKeyChange(types.StreamingToken{DeviceListPosition: posUpdate}, userID, output.UserID)
}
return true
}
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