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// Copyright 2022 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"
"strconv"
"github.com/matrix-org/dendrite/federationapi/queue"
"github.com/matrix-org/dendrite/federationapi/storage"
"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/matrix-org/gomatrixserverlib/spec"
"github.com/nats-io/nats.go"
log "github.com/sirupsen/logrus"
)
// OutputTypingConsumer consumes events that originate in the clientapi.
type OutputTypingConsumer struct {
ctx context.Context
jetstream nats.JetStreamContext
durable string
db storage.Database
queues *queue.OutgoingQueues
isLocalServerName func(spec.ServerName) bool
topic string
}
// NewOutputTypingConsumer creates a new OutputTypingConsumer. Call Start() to begin consuming typing events.
func NewOutputTypingConsumer(
process *process.ProcessContext,
cfg *config.FederationAPI,
js nats.JetStreamContext,
queues *queue.OutgoingQueues,
store storage.Database,
) *OutputTypingConsumer {
return &OutputTypingConsumer{
ctx: process.Context(),
jetstream: js,
queues: queues,
db: store,
isLocalServerName: cfg.Matrix.IsLocalServerName,
durable: cfg.Matrix.JetStream.Durable("FederationAPITypingConsumer"),
topic: cfg.Matrix.JetStream.Prefixed(jetstream.OutputTypingEvent),
}
}
// Start consuming from the clientapi
func (t *OutputTypingConsumer) Start() error {
return jetstream.JetStreamConsumer(
t.ctx, t.jetstream, t.topic, t.durable, 1, t.onMessage,
nats.DeliverAll(), nats.ManualAck(), nats.HeadersOnly(),
)
}
// onMessage is called in response to a message received on the typing
// events topic from the client api.
func (t *OutputTypingConsumer) onMessage(ctx context.Context, msgs []*nats.Msg) bool {
msg := msgs[0] // Guaranteed to exist if onMessage is called
// Extract the typing event from msg.
roomID := msg.Header.Get(jetstream.RoomID)
userID := msg.Header.Get(jetstream.UserID)
typing, err := strconv.ParseBool(msg.Header.Get("typing"))
if err != nil {
log.WithError(err).Errorf("EDU output log: typing parse failure")
return true
}
// only send typing events which originated from us
_, typingServerName, err := gomatrixserverlib.SplitID('@', userID)
if err != nil {
log.WithError(err).WithField("user_id", userID).Error("Failed to extract domain from typing sender")
_ = msg.Ack()
return true
}
if !t.isLocalServerName(typingServerName) {
return true
}
joined, err := t.db.GetJoinedHosts(ctx, roomID)
if err != nil {
log.WithError(err).WithField("room_id", roomID).Error("failed to get joined hosts for room")
return false
}
names := make([]spec.ServerName, len(joined))
for i := range joined {
names[i] = joined[i].ServerName
}
edu := &gomatrixserverlib.EDU{Type: "m.typing"}
if edu.Content, err = json.Marshal(map[string]interface{}{
"room_id": roomID,
"user_id": userID,
"typing": typing,
}); err != nil {
log.WithError(err).Error("failed to marshal EDU JSON")
return true
}
if err := t.queues.SendEDU(edu, typingServerName, names); err != nil {
log.WithError(err).Error("failed to send EDU")
return false
}
return true
}
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