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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"
fedTypes "github.com/matrix-org/dendrite/federationapi/types"
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/types"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/gomatrixserverlib/spec"
"github.com/matrix-org/util"
"github.com/nats-io/nats.go"
log "github.com/sirupsen/logrus"
)
// OutputReceiptConsumer consumes events that originate in the clientapi.
type OutputPresenceConsumer struct {
ctx context.Context
jetstream nats.JetStreamContext
durable string
db storage.Database
queues *queue.OutgoingQueues
isLocalServerName func(spec.ServerName) bool
rsAPI roomserverAPI.FederationRoomserverAPI
topic string
outboundPresenceEnabled bool
}
// NewOutputPresenceConsumer creates a new OutputPresenceConsumer. Call Start() to begin consuming events.
func NewOutputPresenceConsumer(
process *process.ProcessContext,
cfg *config.FederationAPI,
js nats.JetStreamContext,
queues *queue.OutgoingQueues,
store storage.Database,
rsAPI roomserverAPI.FederationRoomserverAPI,
) *OutputPresenceConsumer {
return &OutputPresenceConsumer{
ctx: process.Context(),
jetstream: js,
queues: queues,
db: store,
isLocalServerName: cfg.Matrix.IsLocalServerName,
durable: cfg.Matrix.JetStream.Durable("FederationAPIPresenceConsumer"),
topic: cfg.Matrix.JetStream.Prefixed(jetstream.OutputPresenceEvent),
outboundPresenceEnabled: cfg.Matrix.Presence.EnableOutbound,
rsAPI: rsAPI,
}
}
// Start consuming from the clientapi
func (t *OutputPresenceConsumer) Start() error {
if !t.outboundPresenceEnabled {
return nil
}
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 presence
// events topic from the client api.
func (t *OutputPresenceConsumer) onMessage(ctx context.Context, msgs []*nats.Msg) bool {
msg := msgs[0] // Guaranteed to exist if onMessage is called
// only send presence events which originated from us
userID := msg.Header.Get(jetstream.UserID)
_, serverName, err := gomatrixserverlib.SplitID('@', userID)
if err != nil {
log.WithError(err).WithField("user_id", userID).Error("failed to extract domain from receipt sender")
return true
}
if !t.isLocalServerName(serverName) {
return true
}
parsedUserID, err := spec.NewUserID(userID, true)
if err != nil {
util.GetLogger(ctx).WithError(err).WithField("user_id", userID).Error("invalid user ID")
return true
}
roomIDs, err := t.rsAPI.QueryRoomsForUser(t.ctx, *parsedUserID, "join")
if err != nil {
log.WithError(err).Error("failed to calculate joined rooms for user")
return true
}
roomIDStrs := make([]string, len(roomIDs))
for i, roomID := range roomIDs {
roomIDStrs[i] = roomID.String()
}
presence := msg.Header.Get("presence")
ts, err := strconv.Atoi(msg.Header.Get("last_active_ts"))
if err != nil {
return true
}
// send this presence to all servers who share rooms with this user.
joined, err := t.db.GetJoinedHostsForRooms(t.ctx, roomIDStrs, true, true)
if err != nil {
log.WithError(err).Error("failed to get joined hosts")
return true
}
if len(joined) == 0 {
return true
}
var statusMsg *string = nil
if data, ok := msg.Header["status_msg"]; ok && len(data) > 0 {
status := msg.Header.Get("status_msg")
statusMsg = &status
}
p := types.PresenceInternal{LastActiveTS: spec.Timestamp(ts)}
content := fedTypes.Presence{
Push: []fedTypes.PresenceContent{
{
CurrentlyActive: p.CurrentlyActive(),
LastActiveAgo: p.LastActiveAgo(),
Presence: presence,
StatusMsg: statusMsg,
UserID: userID,
},
},
}
edu := &gomatrixserverlib.EDU{
Type: spec.MPresence,
Origin: string(serverName),
}
if edu.Content, err = json.Marshal(content); err != nil {
log.WithError(err).Error("failed to marshal EDU JSON")
return true
}
log.Tracef("sending presence EDU to %d servers", len(joined))
if err = t.queues.SendEDU(edu, serverName, joined); err != nil {
log.WithError(err).Error("failed to send EDU")
return false
}
return true
}
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