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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"
"fmt"
"github.com/Shopify/sarama"
stateapi "github.com/matrix-org/dendrite/currentstateserver/api"
"github.com/matrix-org/dendrite/federationsender/queue"
"github.com/matrix-org/dendrite/federationsender/storage"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/internal/config"
"github.com/matrix-org/dendrite/keyserver/api"
"github.com/matrix-org/gomatrixserverlib"
log "github.com/sirupsen/logrus"
)
// KeyChangeConsumer consumes events that originate in key server.
type KeyChangeConsumer struct {
consumer *internal.ContinualConsumer
db storage.Database
queues *queue.OutgoingQueues
serverName gomatrixserverlib.ServerName
stateAPI stateapi.CurrentStateInternalAPI
}
// NewKeyChangeConsumer creates a new KeyChangeConsumer. Call Start() to begin consuming from key servers.
func NewKeyChangeConsumer(
cfg *config.KeyServer,
kafkaConsumer sarama.Consumer,
queues *queue.OutgoingQueues,
store storage.Database,
stateAPI stateapi.CurrentStateInternalAPI,
) *KeyChangeConsumer {
c := &KeyChangeConsumer{
consumer: &internal.ContinualConsumer{
ComponentName: "federationsender/keychange",
Topic: string(cfg.Matrix.Kafka.TopicFor(config.TopicOutputKeyChangeEvent)),
Consumer: kafkaConsumer,
PartitionStore: store,
},
queues: queues,
db: store,
serverName: cfg.Matrix.ServerName,
stateAPI: stateAPI,
}
c.consumer.ProcessMessage = c.onMessage
return c
}
// Start consuming from key servers
func (t *KeyChangeConsumer) Start() error {
if err := t.consumer.Start(); err != nil {
return fmt.Errorf("t.consumer.Start: %w", err)
}
return nil
}
// onMessage is called in response to a message received on the
// key change events topic from the key server.
func (t *KeyChangeConsumer) onMessage(msg *sarama.ConsumerMessage) error {
var m api.DeviceMessage
if err := json.Unmarshal(msg.Value, &m); err != nil {
log.WithError(err).Errorf("failed to read device message from key change topic")
return nil
}
logger := log.WithField("user_id", m.UserID)
// only send key change events which originated from us
_, originServerName, err := gomatrixserverlib.SplitID('@', m.UserID)
if err != nil {
logger.WithError(err).Error("Failed to extract domain from key change event")
return nil
}
if originServerName != t.serverName {
return nil
}
var queryRes stateapi.QueryRoomsForUserResponse
err = t.stateAPI.QueryRoomsForUser(context.Background(), &stateapi.QueryRoomsForUserRequest{
UserID: m.UserID,
WantMembership: "join",
}, &queryRes)
if err != nil {
logger.WithError(err).Error("failed to calculate joined rooms for user")
return nil
}
// send this key change to all servers who share rooms with this user.
destinations, err := t.db.GetJoinedHostsForRooms(context.Background(), queryRes.RoomIDs)
if err != nil {
logger.WithError(err).Error("failed to calculate joined hosts for rooms user is in")
return nil
}
// Pack the EDU and marshal it
edu := &gomatrixserverlib.EDU{
Type: gomatrixserverlib.MDeviceListUpdate,
Origin: string(t.serverName),
}
event := gomatrixserverlib.DeviceListUpdateEvent{
UserID: m.UserID,
DeviceID: m.DeviceID,
DeviceDisplayName: m.DisplayName,
StreamID: m.StreamID,
PrevID: prevID(m.StreamID),
Deleted: len(m.KeyJSON) == 0,
Keys: m.KeyJSON,
}
if edu.Content, err = json.Marshal(event); err != nil {
return err
}
log.Infof("Sending device list update message to %q", destinations)
return t.queues.SendEDU(edu, t.serverName, destinations)
}
func prevID(streamID int) []int {
if streamID <= 1 {
return nil
}
return []int{streamID - 1}
}
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