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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"
"github.com/matrix-org/dendrite/eduserver/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/gomatrixserverlib"
"github.com/matrix-org/util"
log "github.com/sirupsen/logrus"
)
// OutputEDUConsumer consumes events that originate in EDU server.
type OutputEDUConsumer struct {
typingConsumer *internal.ContinualConsumer
sendToDeviceConsumer *internal.ContinualConsumer
db storage.Database
queues *queue.OutgoingQueues
ServerName gomatrixserverlib.ServerName
TypingTopic string
SendToDeviceTopic string
}
// NewOutputEDUConsumer creates a new OutputEDUConsumer. Call Start() to begin consuming from EDU servers.
func NewOutputEDUConsumer(
cfg *config.FederationSender,
kafkaConsumer sarama.Consumer,
queues *queue.OutgoingQueues,
store storage.Database,
) *OutputEDUConsumer {
c := &OutputEDUConsumer{
typingConsumer: &internal.ContinualConsumer{
Topic: string(cfg.Matrix.Kafka.Topics.OutputTypingEvent),
Consumer: kafkaConsumer,
PartitionStore: store,
},
sendToDeviceConsumer: &internal.ContinualConsumer{
Topic: string(cfg.Matrix.Kafka.Topics.OutputSendToDeviceEvent),
Consumer: kafkaConsumer,
PartitionStore: store,
},
queues: queues,
db: store,
ServerName: cfg.Matrix.ServerName,
TypingTopic: string(cfg.Matrix.Kafka.Topics.OutputTypingEvent),
SendToDeviceTopic: string(cfg.Matrix.Kafka.Topics.OutputSendToDeviceEvent),
}
c.typingConsumer.ProcessMessage = c.onTypingEvent
c.sendToDeviceConsumer.ProcessMessage = c.onSendToDeviceEvent
return c
}
// Start consuming from EDU servers
func (t *OutputEDUConsumer) Start() error {
if err := t.typingConsumer.Start(); err != nil {
return fmt.Errorf("t.typingConsumer.Start: %w", err)
}
if err := t.sendToDeviceConsumer.Start(); err != nil {
return fmt.Errorf("t.sendToDeviceConsumer.Start: %w", err)
}
return nil
}
// onSendToDeviceEvent is called in response to a message received on the
// send-to-device events topic from the EDU server.
func (t *OutputEDUConsumer) onSendToDeviceEvent(msg *sarama.ConsumerMessage) error {
// Extract the send-to-device event from msg.
var ote api.OutputSendToDeviceEvent
if err := json.Unmarshal(msg.Value, &ote); err != nil {
log.WithError(err).Errorf("eduserver output log: message parse failed (expected send-to-device)")
return nil
}
// only send send-to-device events which originated from us
_, originServerName, err := gomatrixserverlib.SplitID('@', ote.Sender)
if err != nil {
log.WithError(err).WithField("user_id", ote.Sender).Error("Failed to extract domain from send-to-device sender")
return nil
}
if originServerName != t.ServerName {
log.WithField("other_server", originServerName).Info("Suppressing send-to-device: originated elsewhere")
return nil
}
_, destServerName, err := gomatrixserverlib.SplitID('@', ote.UserID)
if err != nil {
log.WithError(err).WithField("user_id", ote.UserID).Error("Failed to extract domain from send-to-device destination")
return nil
}
// Pack the EDU and marshal it
edu := &gomatrixserverlib.EDU{
Type: gomatrixserverlib.MDirectToDevice,
Origin: string(t.ServerName),
}
tdm := gomatrixserverlib.ToDeviceMessage{
Sender: ote.Sender,
Type: ote.Type,
MessageID: util.RandomString(32),
Messages: map[string]map[string]json.RawMessage{
ote.UserID: {
ote.DeviceID: ote.Content,
},
},
}
if edu.Content, err = json.Marshal(tdm); err != nil {
return err
}
log.Infof("Sending send-to-device message into %q destination queue", destServerName)
return t.queues.SendEDU(edu, t.ServerName, []gomatrixserverlib.ServerName{destServerName})
}
// onTypingEvent is called in response to a message received on the typing
// events topic from the EDU server.
func (t *OutputEDUConsumer) onTypingEvent(msg *sarama.ConsumerMessage) error {
// Extract the typing event from msg.
var ote api.OutputTypingEvent
if err := json.Unmarshal(msg.Value, &ote); err != nil {
// Skip this msg but continue processing messages.
log.WithError(err).Errorf("eduserver output log: message parse failed (expected typing)")
return nil
}
// only send typing events which originated from us
_, typingServerName, err := gomatrixserverlib.SplitID('@', ote.Event.UserID)
if err != nil {
log.WithError(err).WithField("user_id", ote.Event.UserID).Error("Failed to extract domain from typing sender")
return nil
}
if typingServerName != t.ServerName {
log.WithField("other_server", typingServerName).Info("Suppressing typing notif: originated elsewhere")
return nil
}
joined, err := t.db.GetJoinedHosts(context.TODO(), ote.Event.RoomID)
if err != nil {
return err
}
names := make([]gomatrixserverlib.ServerName, len(joined))
for i := range joined {
names[i] = joined[i].ServerName
}
edu := &gomatrixserverlib.EDU{Type: ote.Event.Type}
if edu.Content, err = json.Marshal(map[string]interface{}{
"room_id": ote.Event.RoomID,
"user_id": ote.Event.UserID,
"typing": ote.Event.Typing,
}); err != nil {
return err
}
return t.queues.SendEDU(edu, t.ServerName, names)
}
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