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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"
eduserverAPI "github.com/matrix-org/dendrite/eduserver/api"
"github.com/matrix-org/dendrite/federationapi/queue"
"github.com/matrix-org/dendrite/federationapi/storage"
"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/gomatrixserverlib"
"github.com/nats-io/nats.go"
"github.com/sirupsen/logrus"
)
// KeyChangeConsumer consumes events that originate in key server.
type KeyChangeConsumer struct {
ctx context.Context
jetstream nats.JetStreamContext
durable string
db storage.Database
queues *queue.OutgoingQueues
serverName gomatrixserverlib.ServerName
rsAPI roomserverAPI.RoomserverInternalAPI
topic string
}
// NewKeyChangeConsumer creates a new KeyChangeConsumer. Call Start() to begin consuming from key servers.
func NewKeyChangeConsumer(
process *process.ProcessContext,
cfg *config.KeyServer,
js nats.JetStreamContext,
queues *queue.OutgoingQueues,
store storage.Database,
rsAPI roomserverAPI.RoomserverInternalAPI,
) *KeyChangeConsumer {
return &KeyChangeConsumer{
ctx: process.Context(),
jetstream: js,
durable: cfg.Matrix.JetStream.TopicFor("FederationAPIKeyChangeConsumer"),
topic: cfg.Matrix.JetStream.TopicFor(jetstream.OutputKeyChangeEvent),
queues: queues,
db: store,
serverName: cfg.Matrix.ServerName,
rsAPI: rsAPI,
}
}
// Start consuming from key servers
func (t *KeyChangeConsumer) Start() error {
return jetstream.JetStreamConsumer(
t.ctx, t.jetstream, t.topic, t.durable, t.onMessage,
nats.DeliverAll(), nats.ManualAck(),
)
}
// onMessage is called in response to a message received on the
// key change events topic from the key server.
func (t *KeyChangeConsumer) onMessage(ctx context.Context, msg *nats.Msg) bool {
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 t.onCrossSigningMessage(m)
case api.TypeDeviceKeyUpdate:
fallthrough
default:
return t.onDeviceKeyMessage(m)
}
}
func (t *KeyChangeConsumer) onDeviceKeyMessage(m api.DeviceMessage) bool {
if m.DeviceKeys == nil {
return true
}
logger := logrus.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 true
}
if originServerName != t.serverName {
return true
}
var queryRes roomserverAPI.QueryRoomsForUserResponse
err = t.rsAPI.QueryRoomsForUser(t.ctx, &roomserverAPI.QueryRoomsForUserRequest{
UserID: m.UserID,
WantMembership: "join",
}, &queryRes)
if err != nil {
logger.WithError(err).Error("failed to calculate joined rooms for user")
return true
}
// send this key change to all servers who share rooms with this user.
destinations, err := t.db.GetJoinedHostsForRooms(t.ctx, queryRes.RoomIDs, true)
if err != nil {
logger.WithError(err).Error("failed to calculate joined hosts for rooms user is in")
return true
}
// 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 {
logger.WithError(err).Error("failed to marshal EDU JSON")
return true
}
logger.Infof("Sending device list update message to %q", destinations)
err = t.queues.SendEDU(edu, t.serverName, destinations)
return err == nil
}
func (t *KeyChangeConsumer) onCrossSigningMessage(m api.DeviceMessage) bool {
output := m.CrossSigningKeyUpdate
_, host, err := gomatrixserverlib.SplitID('@', output.UserID)
if err != nil {
logrus.WithError(err).Errorf("fedsender key change consumer: user ID parse failure")
return true
}
if host != gomatrixserverlib.ServerName(t.serverName) {
// Ignore any messages that didn't originate locally, otherwise we'll
// end up parroting information we received from other servers.
return true
}
logger := logrus.WithField("user_id", output.UserID)
var queryRes roomserverAPI.QueryRoomsForUserResponse
err = t.rsAPI.QueryRoomsForUser(t.ctx, &roomserverAPI.QueryRoomsForUserRequest{
UserID: output.UserID,
WantMembership: "join",
}, &queryRes)
if err != nil {
logger.WithError(err).Error("fedsender key change consumer: failed to calculate joined rooms for user")
return true
}
// send this key change to all servers who share rooms with this user.
destinations, err := t.db.GetJoinedHostsForRooms(t.ctx, queryRes.RoomIDs, true)
if err != nil {
logger.WithError(err).Error("fedsender key change consumer: failed to calculate joined hosts for rooms user is in")
return true
}
// Pack the EDU and marshal it
edu := &gomatrixserverlib.EDU{
Type: eduserverAPI.MSigningKeyUpdate,
Origin: string(t.serverName),
}
if edu.Content, err = json.Marshal(output); err != nil {
logger.WithError(err).Error("fedsender key change consumer: failed to marshal output, dropping")
return true
}
logger.Infof("Sending cross-signing update message to %q", destinations)
err = t.queues.SendEDU(edu, t.serverName, destinations)
return err == nil
}
func prevID(streamID int) []int {
if streamID <= 1 {
return nil
}
return []int{streamID - 1}
}
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