Add presence module V2 (#2312)

* Syncapi presence * Clientapi http presence handler * Why is this here? * Missing files * FederationAPI presence implementation * Add new presence stream * Pinecone update * Pinecone update * Add passing tests * Make linter happy * Add presence producer * Add presence config option * Set user to unavailable after x minutes * Only set currently_active if online Avoid unneeded presence updates when syncing * Tweaks * Query devices for last_active_ts Fixes & tweaks * Export SharedUsers/SharedUsers * Presence stream in MemoryStorage * Remove status_msg_nil * Fix sytest crashes * Make presence types const and use stringer for it * Change options to allow inbound/outbound presence * Fix option & typo * Update configs Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>
2024-11-22 03:31:41 +00:00 · 2022-04-06 13:11:19 +02:00 · 2022-04-06 13:11:19 +02:00 · e5e3350ce1
commit e5e3350ce1
parent 16e2d243fc
38 changed files with 1706 additions and 66 deletions
--- a/build/docker/config/dendrite.yaml
+++ b/build/docker/config/dendrite.yaml
@ -62,6 +62,17 @@ global:
    - matrix.org
    - vector.im

+  # Disables federation. Dendrite will not be able to make any outbound HTTP requests
+  # to other servers and the federation API will not be exposed.
+  disable_federation: false
+
+  # Configures the handling of presence events.
+  presence:
+    # Whether inbound presence events are allowed, e.g. receiving presence events from other servers
+    enable_inbound: false
+    # Whether outbound presence events are allowed, e.g. sending presence events to other servers
+    enable_outbound: false
+
  # Configuration for NATS JetStream
  jetstream:
    # A list of NATS Server addresses to connect to. If none are specified, an
--- a/clientapi/clientapi.go
+++ b/clientapi/clientapi.go
@ -48,7 +48,7 @@ func AddPublicRoutes(
 	extRoomsProvider api.ExtraPublicRoomsProvider,
 	mscCfg *config.MSCs,
 ) {
-	js, _ := jetstream.Prepare(process, &cfg.Matrix.JetStream)
+	js, natsClient := jetstream.Prepare(process, &cfg.Matrix.JetStream)

 	syncProducer := &producers.SyncAPIProducer{
 		JetStream:              js,
@ -56,6 +56,7 @@ func AddPublicRoutes(
 		TopicReceiptEvent:      cfg.Matrix.JetStream.Prefixed(jetstream.OutputReceiptEvent),
 		TopicSendToDeviceEvent: cfg.Matrix.JetStream.Prefixed(jetstream.OutputSendToDeviceEvent),
 		TopicTypingEvent:       cfg.Matrix.JetStream.Prefixed(jetstream.OutputTypingEvent),
+		TopicPresenceEvent:     cfg.Matrix.JetStream.Prefixed(jetstream.OutputPresenceEvent),
 		UserAPI:                userAPI,
 		ServerName:             cfg.Matrix.ServerName,
 	}
@ -64,6 +65,6 @@ func AddPublicRoutes(
 		router, synapseAdminRouter, cfg, rsAPI, asAPI,
 		userAPI, userDirectoryProvider, federation,
 		syncProducer, transactionsCache, fsAPI, keyAPI,
-		extRoomsProvider, mscCfg,
+		extRoomsProvider, mscCfg, natsClient,
 	)
 }
--- a/clientapi/producers/syncapi.go
+++ b/clientapi/producers/syncapi.go
@ -18,6 +18,7 @@ import (
 	"context"
 	"encoding/json"
 	"strconv"
+	"time"

 	"github.com/matrix-org/dendrite/internal/eventutil"
 	"github.com/matrix-org/dendrite/setup/jetstream"
@ -34,6 +35,7 @@ type SyncAPIProducer struct {
 	TopicReceiptEvent      string
 	TopicSendToDeviceEvent string
 	TopicTypingEvent       string
+	TopicPresenceEvent     string
 	JetStream              nats.JetStreamContext
 	ServerName             gomatrixserverlib.ServerName
 	UserAPI                userapi.UserInternalAPI
@ -173,3 +175,19 @@ func (p *SyncAPIProducer) SendTyping(
 	_, err := p.JetStream.PublishMsg(m, nats.Context(ctx))
 	return err
 }
+
+func (p *SyncAPIProducer) SendPresence(
+	ctx context.Context, userID string, presence types.Presence, statusMsg *string,
+) error {
+	m := nats.NewMsg(p.TopicPresenceEvent)
+	m.Header.Set(jetstream.UserID, userID)
+	m.Header.Set("presence", presence.String())
+	if statusMsg != nil {
+		m.Header.Set("status_msg", *statusMsg)
+	}
+
+	m.Header.Set("last_active_ts", strconv.Itoa(int(gomatrixserverlib.AsTimestamp(time.Now()))))
+
+	_, err := p.JetStream.PublishMsg(m, nats.Context(ctx))
+	return err
+}
--- a/clientapi/routing/presence.go
+++ b/clientapi/routing/presence.go
@ -0,0 +1,138 @@
+// 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 routing
+
+import (
+	"fmt"
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/matrix-org/dendrite/clientapi/httputil"
+	"github.com/matrix-org/dendrite/clientapi/jsonerror"
+	"github.com/matrix-org/dendrite/clientapi/producers"
+	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/jetstream"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/matrix-org/util"
+	"github.com/nats-io/nats.go"
+	log "github.com/sirupsen/logrus"
+)
+
+type presenceReq struct {
+	Presence  string  `json:"presence"`
+	StatusMsg *string `json:"status_msg,omitempty"`
+}
+
+func SetPresence(
+	req *http.Request,
+	cfg *config.ClientAPI,
+	device *api.Device,
+	producer *producers.SyncAPIProducer,
+	userID string,
+) util.JSONResponse {
+	if !cfg.Matrix.Presence.EnableOutbound {
+		return util.JSONResponse{
+			Code: http.StatusOK,
+			JSON: struct{}{},
+		}
+	}
+	if device.UserID != userID {
+		return util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden("Unable to set presence for other user."),
+		}
+	}
+	var presence presenceReq
+	parseErr := httputil.UnmarshalJSONRequest(req, &presence)
+	if parseErr != nil {
+		return *parseErr
+	}
+
+	presenceStatus, ok := types.PresenceFromString(presence.Presence)
+	if !ok {
+		return util.JSONResponse{
+			Code: http.StatusBadRequest,
+			JSON: jsonerror.Unknown(fmt.Sprintf("Unknown presence '%s'.", presence.Presence)),
+		}
+	}
+
+	err := producer.SendPresence(req.Context(), userID, presenceStatus, presence.StatusMsg)
+	if err != nil {
+		log.WithError(err).Errorf("failed to update presence")
+		return util.JSONResponse{
+			Code: http.StatusInternalServerError,
+			JSON: jsonerror.InternalServerError(),
+		}
+	}
+
+	return util.JSONResponse{
+		Code: http.StatusOK,
+		JSON: struct{}{},
+	}
+}
+
+func GetPresence(
+	req *http.Request,
+	device *api.Device,
+	natsClient *nats.Conn,
+	presenceTopic string,
+	userID string,
+) util.JSONResponse {
+	msg := nats.NewMsg(presenceTopic)
+	msg.Header.Set(jetstream.UserID, userID)
+
+	presence, err := natsClient.RequestMsg(msg, time.Second*10)
+	if err != nil {
+		log.WithError(err).Errorf("unable to get presence")
+		return util.JSONResponse{
+			Code: http.StatusInternalServerError,
+			JSON: jsonerror.InternalServerError(),
+		}
+	}
+
+	statusMsg := presence.Header.Get("status_msg")
+	e := presence.Header.Get("error")
+	if e != "" {
+		log.Errorf("received error msg from nats: %s", e)
+		return util.JSONResponse{
+			Code: http.StatusOK,
+			JSON: types.PresenceClientResponse{
+				Presence: types.PresenceUnavailable.String(),
+			},
+		}
+	}
+	lastActive, err := strconv.Atoi(presence.Header.Get("last_active_ts"))
+	if err != nil {
+		return util.JSONResponse{
+			Code: http.StatusInternalServerError,
+			JSON: jsonerror.InternalServerError(),
+		}
+	}
+
+	p := types.PresenceInternal{LastActiveTS: gomatrixserverlib.Timestamp(lastActive)}
+	currentlyActive := p.CurrentlyActive()
+	return util.JSONResponse{
+		Code: http.StatusOK,
+		JSON: types.PresenceClientResponse{
+			CurrentlyActive: &currentlyActive,
+			LastActiveAgo:   p.LastActiveAgo(),
+			Presence:        presence.Header.Get("presence"),
+			StatusMsg:       &statusMsg,
+		},
+	}
+}
--- a/clientapi/routing/routing.go
+++ b/clientapi/routing/routing.go
@ -32,9 +32,11 @@ import (
 	keyserverAPI "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"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
+	"github.com/nats-io/nats.go"
 	"github.com/sirupsen/logrus"
 )

@ -56,7 +58,7 @@ func Setup(
 	federationSender federationAPI.FederationInternalAPI,
 	keyAPI keyserverAPI.KeyInternalAPI,
 	extRoomsProvider api.ExtraPublicRoomsProvider,
-	mscCfg *config.MSCs,
+	mscCfg *config.MSCs, natsClient *nats.Conn,
 ) {
 	rateLimits := httputil.NewRateLimits(&cfg.RateLimiting)
 	userInteractiveAuth := auth.NewUserInteractive(userAPI, cfg)
@ -779,20 +781,6 @@ func Setup(
 		}),
 	).Methods(http.MethodPost, http.MethodOptions)

-	// Element logs get flooded unless this is handled
-	v3mux.Handle("/presence/{userID}/status",
-		httputil.MakeExternalAPI("presence", func(req *http.Request) util.JSONResponse {
-			if r := rateLimits.Limit(req); r != nil {
-				return *r
-			}
-			// TODO: Set presence (probably the responsibility of a presence server not clientapi)
-			return util.JSONResponse{
-				Code: http.StatusOK,
-				JSON: struct{}{},
-			}
-		}),
-	).Methods(http.MethodPut, http.MethodOptions)
-
 	v3mux.Handle("/voip/turnServer",
 		httputil.MakeAuthAPI("turn_server", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
 			if r := rateLimits.Limit(req); r != nil {
@ -1308,4 +1296,22 @@ func Setup(
 			return SetReceipt(req, syncProducer, device, vars["roomId"], vars["receiptType"], vars["eventId"])
 		}),
 	).Methods(http.MethodPost, http.MethodOptions)
+	v3mux.Handle("/presence/{userId}/status",
+		httputil.MakeAuthAPI("set_presence", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
+			vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
+			if err != nil {
+				return util.ErrorResponse(err)
+			}
+			return SetPresence(req, cfg, device, syncProducer, vars["userId"])
+		}),
+	).Methods(http.MethodPut, http.MethodOptions)
+	v3mux.Handle("/presence/{userId}/status",
+		httputil.MakeAuthAPI("get_presence", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
+			vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
+			if err != nil {
+				return util.ErrorResponse(err)
+			}
+			return GetPresence(req, device, natsClient, cfg.Matrix.JetStream.Prefixed(jetstream.RequestPresence), vars["userId"])
+		}),
+	).Methods(http.MethodGet, http.MethodOptions)
 }
--- a/cmd/generate-config/main.go
+++ b/cmd/generate-config/main.go
@ -91,6 +91,10 @@ func main() {
 		cfg.UserAPI.BCryptCost = bcrypt.MinCost
 		cfg.Global.JetStream.InMemory = true
 		cfg.ClientAPI.RegistrationSharedSecret = "complement"
+		cfg.Global.Presence = config.PresenceOptions{
+			EnableInbound:  true,
+			EnableOutbound: true,
+		}
 	}

 	j, err := yaml.Marshal(cfg)
--- a/dendrite-config.yaml
+++ b/dendrite-config.yaml
@ -68,6 +68,13 @@ global:
  # to other servers and the federation API will not be exposed.
  disable_federation: false

+  # Configures the handling of presence events.
+  presence:
+    # Whether inbound presence events are allowed, e.g. receiving presence events from other servers
+    enable_inbound: false
+    # Whether outbound presence events are allowed, e.g. sending presence events to other servers
+    enable_outbound: false
+
  # Server notices allows server admins to send messages to all users.
  server_notices:
    enabled: false
--- a/federationapi/consumers/presence.go
+++ b/federationapi/consumers/presence.go
@ -0,0 +1,143 @@
+// 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"
+	"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/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
+	ServerName              gomatrixserverlib.ServerName
+	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,
+) *OutputPresenceConsumer {
+	return &OutputPresenceConsumer{
+		ctx:                     process.Context(),
+		jetstream:               js,
+		queues:                  queues,
+		db:                      store,
+		ServerName:              cfg.Matrix.ServerName,
+		durable:                 cfg.Matrix.JetStream.Durable("FederationAPIPresenceConsumer"),
+		topic:                   cfg.Matrix.JetStream.Prefixed(jetstream.OutputPresenceEvent),
+		outboundPresenceEnabled: cfg.Matrix.Presence.EnableOutbound,
+	}
+}
+
+// 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, 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, msg *nats.Msg) bool {
+	// 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 serverName != t.ServerName {
+		return true
+	}
+
+	presence := msg.Header.Get("presence")
+
+	ts, err := strconv.Atoi(msg.Header.Get("last_active_ts"))
+	if err != nil {
+		return true
+	}
+
+	joined, err := t.db.GetAllJoinedHosts(ctx)
+	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: gomatrixserverlib.Timestamp(ts)}
+
+	content := fedTypes.Presence{
+		Push: []fedTypes.PresenceContent{
+			{
+				CurrentlyActive: p.CurrentlyActive(),
+				LastActiveAgo:   p.LastActiveAgo(),
+				Presence:        presence,
+				StatusMsg:       statusMsg,
+				UserID:          userID,
+			},
+		},
+	}
+
+	edu := &gomatrixserverlib.EDU{
+		Type:   gomatrixserverlib.MPresence,
+		Origin: string(t.ServerName),
+	}
+	if edu.Content, err = json.Marshal(content); err != nil {
+		log.WithError(err).Error("failed to marshal EDU JSON")
+		return true
+	}
+
+	log.Debugf("sending presence EDU to %d servers", len(joined))
+	if err = t.queues.SendEDU(edu, t.ServerName, joined); err != nil {
+		log.WithError(err).Error("failed to send EDU")
+		return false
+	}
+
+	return true
+}
--- a/federationapi/federationapi.go
+++ b/federationapi/federationapi.go
@ -66,6 +66,7 @@ func AddPublicRoutes(
 		TopicReceiptEvent:      cfg.Matrix.JetStream.Prefixed(jetstream.OutputReceiptEvent),
 		TopicSendToDeviceEvent: cfg.Matrix.JetStream.Prefixed(jetstream.OutputSendToDeviceEvent),
 		TopicTypingEvent:       cfg.Matrix.JetStream.Prefixed(jetstream.OutputTypingEvent),
+		TopicPresenceEvent:     cfg.Matrix.JetStream.Prefixed(jetstream.OutputPresenceEvent),
 		ServerName:             cfg.Matrix.ServerName,
 		UserAPI:                userAPI,
 	}
@ -149,5 +150,11 @@ func NewInternalAPI(
 		logrus.WithError(err).Panic("failed to start key server consumer")
 	}

+	presenceConsumer := consumers.NewOutputPresenceConsumer(
+		base.ProcessContext, cfg, js, queues, federationDB,
+	)
+	if err = presenceConsumer.Start(); err != nil {
+		logrus.WithError(err).Panic("failed to start presence consumer")
+	}
 	return internal.NewFederationInternalAPI(federationDB, cfg, rsAPI, federation, stats, caches, queues, keyRing)
 }
--- a/federationapi/producers/syncapi.go
+++ b/federationapi/producers/syncapi.go
@ -18,6 +18,7 @@ import (
 	"context"
 	"encoding/json"
 	"strconv"
+	"time"

 	"github.com/matrix-org/dendrite/setup/jetstream"
 	"github.com/matrix-org/dendrite/syncapi/types"
@ -32,6 +33,7 @@ type SyncAPIProducer struct {
 	TopicReceiptEvent      string
 	TopicSendToDeviceEvent string
 	TopicTypingEvent       string
+	TopicPresenceEvent     string
 	JetStream              nats.JetStreamContext
 	ServerName             gomatrixserverlib.ServerName
 	UserAPI                userapi.UserInternalAPI
@ -142,3 +144,20 @@ func (p *SyncAPIProducer) SendTyping(
 	_, err := p.JetStream.PublishMsg(m, nats.Context(ctx))
 	return err
 }
+
+func (p *SyncAPIProducer) SendPresence(
+	ctx context.Context, userID string, presence types.Presence, statusMsg *string, lastActiveAgo int64,
+) error {
+	m := nats.NewMsg(p.TopicPresenceEvent)
+	m.Header.Set(jetstream.UserID, userID)
+	m.Header.Set("presence", presence.String())
+	if statusMsg != nil {
+		m.Header.Set("status_msg", *statusMsg)
+	}
+	lastActiveTS := gomatrixserverlib.AsTimestamp(time.Now().Add(-(time.Duration(lastActiveAgo) * time.Millisecond)))
+
+	m.Header.Set("last_active_ts", strconv.Itoa(int(lastActiveTS)))
+	log.Debugf("Sending presence to syncAPI: %+v", m.Header)
+	_, err := p.JetStream.PublishMsg(m, nats.Context(ctx))
+	return err
+}
--- a/federationapi/routing/send.go
+++ b/federationapi/routing/send.go
@ -30,6 +30,7 @@ import (
 	keyapi "github.com/matrix-org/dendrite/keyserver/api"
 	"github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/setup/config"
+	syncTypes "github.com/matrix-org/dendrite/syncapi/types"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
 	"github.com/prometheus/client_golang/prometheus"
@ -134,6 +135,7 @@ func Send(
 		keyAPI:                 keyAPI,
 		roomsMu:                mu,
 		producer:               producer,
+		inboundPresenceEnabled: cfg.Matrix.Presence.EnableInbound,
 	}

 	var txnEvents struct {
@ -192,6 +194,7 @@ type txnReq struct {
 	roomsMu                *internal.MutexByRoom
 	servers                federationAPI.ServersInRoomProvider
 	producer               *producers.SyncAPIProducer
+	inboundPresenceEnabled bool
 }

 // A subset of FederationClient functionality that txn requires. Useful for testing.
@ -389,12 +392,37 @@ func (t *txnReq) processEDUs(ctx context.Context) {
 			if err := t.processSigningKeyUpdate(ctx, e); err != nil {
 				logrus.WithError(err).Errorf("Failed to process signing key update")
 			}
+		case gomatrixserverlib.MPresence:
+			if t.inboundPresenceEnabled {
+				if err := t.processPresence(ctx, e); err != nil {
+					logrus.WithError(err).Errorf("Failed to process presence update")
+				}
+			}
 		default:
 			util.GetLogger(ctx).WithField("type", e.Type).Debug("Unhandled EDU")
 		}
 	}
 }

+// processPresence handles m.receipt events
+func (t *txnReq) processPresence(ctx context.Context, e gomatrixserverlib.EDU) error {
+	payload := types.Presence{}
+	if err := json.Unmarshal(e.Content, &payload); err != nil {
+		return err
+	}
+	for _, content := range payload.Push {
+		presence, ok := syncTypes.PresenceFromString(content.Presence)
+		if !ok {
+			logrus.Warnf("invalid presence '%s', skipping.", content.Presence)
+			continue
+		}
+		if err := t.producer.SendPresence(ctx, content.UserID, presence, content.StatusMsg, content.LastActiveAgo); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (t *txnReq) processSigningKeyUpdate(ctx context.Context, e gomatrixserverlib.EDU) error {
 	var updatePayload keyapi.CrossSigningKeyUpdate
 	if err := json.Unmarshal(e.Content, &updatePayload); err != nil {
--- a/federationapi/types/types.go
+++ b/federationapi/types/types.go
@ -66,3 +66,15 @@ type FederationReceiptData struct {
 type ReceiptTS struct {
 	TS gomatrixserverlib.Timestamp `json:"ts"`
 }
+
+type Presence struct {
+	Push []PresenceContent `json:"push"`
+}
+
+type PresenceContent struct {
+	CurrentlyActive bool    `json:"currently_active,omitempty"`
+	LastActiveAgo   int64   `json:"last_active_ago"`
+	Presence        string  `json:"presence"`
+	StatusMsg       *string `json:"status_msg,omitempty"`
+	UserID          string  `json:"user_id"`
+}
--- a/setup/config/config_global.go
+++ b/setup/config/config_global.go
@ -41,6 +41,9 @@ type Global struct {
 	// to other servers and the federation API will not be exposed.
 	DisableFederation bool `yaml:"disable_federation"`

+	// Configures the handling of presence events.
+	Presence PresenceOptions `yaml:"presence"`
+
 	// List of domains that the server will trust as identity servers to
 	// verify third-party identifiers.
 	// Defaults to an empty array.
@ -225,3 +228,11 @@ func (c *DNSCacheOptions) Verify(configErrs *ConfigErrors, isMonolith bool) {
 	checkPositive(configErrs, "cache_size", int64(c.CacheSize))
 	checkPositive(configErrs, "cache_lifetime", int64(c.CacheLifetime))
 }
+
+// PresenceOptions defines possible configurations for presence events.
+type PresenceOptions struct {
+	// Whether inbound presence events are allowed
+	EnableInbound bool `yaml:"enable_inbound"`
+	// Whether outbound presence events are allowed
+	EnableOutbound bool `yaml:"enable_outbound"`
+}
--- a/setup/jetstream/streams.go
+++ b/setup/jetstream/streams.go
@ -25,6 +25,8 @@ var (
 	OutputReceiptEvent      = "OutputReceiptEvent"
 	OutputStreamEvent       = "OutputStreamEvent"
 	OutputReadUpdate        = "OutputReadUpdate"
+	RequestPresence         = "GetPresence"
+	OutputPresenceEvent     = "OutputPresenceEvent"
 )

 var safeCharacters = regexp.MustCompile("[^A-Za-z0-9$]+")
@ -89,4 +91,10 @@ var streams = []*nats.StreamConfig{
 		Retention: nats.InterestPolicy,
 		Storage:   nats.FileStorage,
 	},
+	{
+		Name:      OutputPresenceEvent,
+		Retention: nats.InterestPolicy,
+		Storage:   nats.MemoryStorage,
+		MaxAge:    time.Minute * 5,
+	},
 }
--- a/syncapi/consumers/presence.go
+++ b/syncapi/consumers/presence.go
@ -0,0 +1,158 @@
+// 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"
+	"strconv"
+
+	"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/notifier"
+	"github.com/matrix-org/dendrite/syncapi/storage"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/nats-io/nats.go"
+	"github.com/sirupsen/logrus"
+)
+
+// OutputTypingEventConsumer consumes events that originated in the EDU server.
+type PresenceConsumer struct {
+	ctx           context.Context
+	jetstream     nats.JetStreamContext
+	nats          *nats.Conn
+	durable       string
+	requestTopic  string
+	presenceTopic string
+	db            storage.Database
+	stream        types.StreamProvider
+	notifier      *notifier.Notifier
+	deviceAPI     api.UserDeviceAPI
+	cfg           *config.SyncAPI
+}
+
+// NewPresenceConsumer creates a new PresenceConsumer.
+// Call Start() to begin consuming events.
+func NewPresenceConsumer(
+	process *process.ProcessContext,
+	cfg *config.SyncAPI,
+	js nats.JetStreamContext,
+	nats *nats.Conn,
+	db storage.Database,
+	notifier *notifier.Notifier,
+	stream types.StreamProvider,
+	deviceAPI api.UserDeviceAPI,
+) *PresenceConsumer {
+	return &PresenceConsumer{
+		ctx:           process.Context(),
+		nats:          nats,
+		jetstream:     js,
+		durable:       cfg.Matrix.JetStream.Durable("SyncAPIPresenceConsumer"),
+		presenceTopic: cfg.Matrix.JetStream.Prefixed(jetstream.OutputPresenceEvent),
+		requestTopic:  cfg.Matrix.JetStream.Prefixed(jetstream.RequestPresence),
+		db:            db,
+		notifier:      notifier,
+		stream:        stream,
+		deviceAPI:     deviceAPI,
+		cfg:           cfg,
+	}
+}
+
+// Start consuming typing events.
+func (s *PresenceConsumer) Start() error {
+	// Normal NATS subscription, used by Request/Reply
+	_, err := s.nats.Subscribe(s.requestTopic, func(msg *nats.Msg) {
+		userID := msg.Header.Get(jetstream.UserID)
+		presence, err := s.db.GetPresence(context.Background(), userID)
+		m := &nats.Msg{
+			Header: nats.Header{},
+		}
+		if err != nil {
+			m.Header.Set("error", err.Error())
+			if err = msg.RespondMsg(m); err != nil {
+				logrus.WithError(err).Error("Unable to respond to messages")
+			}
+			return
+		}
+
+		deviceRes := api.QueryDevicesResponse{}
+		if err = s.deviceAPI.QueryDevices(s.ctx, &api.QueryDevicesRequest{UserID: userID}, &deviceRes); err != nil {
+			m.Header.Set("error", err.Error())
+			if err = msg.RespondMsg(m); err != nil {
+				logrus.WithError(err).Error("Unable to respond to messages")
+			}
+			return
+		}
+
+		for i := range deviceRes.Devices {
+			if int64(presence.LastActiveTS) < deviceRes.Devices[i].LastSeenTS {
+				presence.LastActiveTS = gomatrixserverlib.Timestamp(deviceRes.Devices[i].LastSeenTS)
+			}
+		}
+
+		m.Header.Set(jetstream.UserID, presence.UserID)
+		m.Header.Set("presence", presence.ClientFields.Presence)
+		m.Header.Set("status_msg", *presence.ClientFields.StatusMsg)
+		m.Header.Set("last_active_ts", strconv.Itoa(int(presence.LastActiveTS)))
+
+		if err = msg.RespondMsg(m); err != nil {
+			logrus.WithError(err).Error("Unable to respond to messages")
+			return
+		}
+	})
+	if err != nil {
+		return err
+	}
+	if !s.cfg.Matrix.Presence.EnableInbound && !s.cfg.Matrix.Presence.EnableOutbound {
+		return nil
+	}
+	return jetstream.JetStreamConsumer(
+		s.ctx, s.jetstream, s.presenceTopic, s.durable, s.onMessage,
+		nats.DeliverAll(), nats.ManualAck(), nats.HeadersOnly(),
+	)
+}
+
+func (s *PresenceConsumer) onMessage(ctx context.Context, msg *nats.Msg) bool {
+	userID := msg.Header.Get(jetstream.UserID)
+	presence := msg.Header.Get("presence")
+	timestamp := msg.Header.Get("last_active_ts")
+	fromSync, _ := strconv.ParseBool(msg.Header.Get("from_sync"))
+
+	logrus.Debugf("syncAPI received presence event: %+v", msg.Header)
+
+	ts, err := strconv.Atoi(timestamp)
+	if err != nil {
+		return true
+	}
+
+	var statusMsg *string = nil
+	if data, ok := msg.Header["status_msg"]; ok && len(data) > 0 {
+		newMsg := msg.Header.Get("status_msg")
+		statusMsg = &newMsg
+	}
+	// OK is already checked, so no need to do it again
+	p, _ := types.PresenceFromString(presence)
+	pos, err := s.db.UpdatePresence(ctx, userID, p, statusMsg, gomatrixserverlib.Timestamp(ts), fromSync)
+	if err != nil {
+		return true
+	}
+
+	s.stream.Advance(pos)
+	s.notifier.OnNewPresence(types.StreamingToken{PresencePosition: pos}, userID)
+
+	return true
+}
--- a/syncapi/notifier/notifier.go
+++ b/syncapi/notifier/notifier.go
@ -43,22 +43,30 @@ type Notifier struct {
 	userDeviceStreams map[string]map[string]*UserDeviceStream
 	// The last time we cleaned out stale entries from the userStreams map
 	lastCleanUpTime time.Time
+	// Protects roomIDToJoinedUsers and roomIDToPeekingDevices
+	mapLock *sync.RWMutex
 }

 // NewNotifier creates a new notifier set to the given sync position.
 // In order for this to be of any use, the Notifier needs to be told all rooms and
 // the joined users within each of them by calling Notifier.Load(*storage.SyncServerDatabase).
-func NewNotifier(currPos types.StreamingToken) *Notifier {
+func NewNotifier() *Notifier {
 	return &Notifier{
-		currPos:                currPos,
 		roomIDToJoinedUsers:    make(map[string]userIDSet),
 		roomIDToPeekingDevices: make(map[string]peekingDeviceSet),
 		userDeviceStreams:      make(map[string]map[string]*UserDeviceStream),
 		streamLock:             &sync.Mutex{},
+		mapLock:                &sync.RWMutex{},
 		lastCleanUpTime:        time.Now(),
 	}
 }

+// SetCurrentPosition sets the current streaming positions.
+// This must be called directly after NewNotifier and initialising the streams.
+func (n *Notifier) SetCurrentPosition(currPos types.StreamingToken) {
+	n.currPos = currPos
+}
+
 // OnNewEvent is called when a new event is received from the room server. Must only be
 // called from a single goroutine, to avoid races between updates which could set the
 // current sync position incorrectly.
@ -83,7 +91,7 @@ func (n *Notifier) OnNewEvent(

 	if ev != nil {
 		// Map this event's room_id to a list of joined users, and wake them up.
-		usersToNotify := n.joinedUsers(ev.RoomID())
+		usersToNotify := n.JoinedUsers(ev.RoomID())
 		// Map this event's room_id to a list of peeking devices, and wake them up.
 		peekingDevicesToNotify := n.PeekingDevices(ev.RoomID())
 		// If this is an invite, also add in the invitee to this list.
@ -114,7 +122,7 @@ func (n *Notifier) OnNewEvent(

 		n.wakeupUsers(usersToNotify, peekingDevicesToNotify, n.currPos)
 	} else if roomID != "" {
-		n.wakeupUsers(n.joinedUsers(roomID), n.PeekingDevices(roomID), n.currPos)
+		n.wakeupUsers(n.JoinedUsers(roomID), n.PeekingDevices(roomID), n.currPos)
 	} else if len(userIDs) > 0 {
 		n.wakeupUsers(userIDs, nil, n.currPos)
 	} else {
@ -182,7 +190,7 @@ func (n *Notifier) OnNewTyping(
 	defer n.streamLock.Unlock()

 	n.currPos.ApplyUpdates(posUpdate)
-	n.wakeupUsers(n.joinedUsers(roomID), nil, n.currPos)
+	n.wakeupUsers(n.JoinedUsers(roomID), nil, n.currPos)
 }

 // OnNewReceipt updates the current position
@ -194,7 +202,7 @@ func (n *Notifier) OnNewReceipt(
 	defer n.streamLock.Unlock()

 	n.currPos.ApplyUpdates(posUpdate)
-	n.wakeupUsers(n.joinedUsers(roomID), nil, n.currPos)
+	n.wakeupUsers(n.JoinedUsers(roomID), nil, n.currPos)
 }

 func (n *Notifier) OnNewKeyChange(
@ -228,6 +236,28 @@ func (n *Notifier) OnNewNotificationData(
 	n.wakeupUsers([]string{userID}, nil, n.currPos)
 }

+func (n *Notifier) OnNewPresence(
+	posUpdate types.StreamingToken, userID string,
+) {
+	n.streamLock.Lock()
+	defer n.streamLock.Unlock()
+
+	n.currPos.ApplyUpdates(posUpdate)
+	sharedUsers := n.SharedUsers(userID)
+	sharedUsers = append(sharedUsers, userID)
+
+	n.wakeupUsers(sharedUsers, nil, n.currPos)
+}
+
+func (n *Notifier) SharedUsers(userID string) (sharedUsers []string) {
+	for roomID, users := range n.roomIDToJoinedUsers {
+		if _, ok := users[userID]; ok {
+			sharedUsers = append(sharedUsers, n.JoinedUsers(roomID)...)
+		}
+	}
+	return sharedUsers
+}
+
 // GetListener returns a UserStreamListener that can be used to wait for
 // updates for a user. Must be closed.
 // notify for anything before sincePos
@ -250,6 +280,8 @@ func (n *Notifier) GetListener(req types.SyncRequest) UserDeviceStreamListener {

 // Load the membership states required to notify users correctly.
 func (n *Notifier) Load(ctx context.Context, db storage.Database) error {
+	n.mapLock.Lock()
+	defer n.mapLock.Unlock()
 	roomToUsers, err := db.AllJoinedUsersInRooms(ctx)
 	if err != nil {
 		return err
@ -377,6 +409,8 @@ func (n *Notifier) fetchUserStreams(userID string) []*UserDeviceStream {

 // Not thread-safe: must be called on the OnNewEvent goroutine only
 func (n *Notifier) addJoinedUser(roomID, userID string) {
+	n.mapLock.Lock()
+	defer n.mapLock.Unlock()
 	if _, ok := n.roomIDToJoinedUsers[roomID]; !ok {
 		n.roomIDToJoinedUsers[roomID] = make(userIDSet)
 	}
@ -385,6 +419,8 @@ func (n *Notifier) addJoinedUser(roomID, userID string) {

 // Not thread-safe: must be called on the OnNewEvent goroutine only
 func (n *Notifier) removeJoinedUser(roomID, userID string) {
+	n.mapLock.Lock()
+	defer n.mapLock.Unlock()
 	if _, ok := n.roomIDToJoinedUsers[roomID]; !ok {
 		n.roomIDToJoinedUsers[roomID] = make(userIDSet)
 	}
@ -392,7 +428,9 @@ func (n *Notifier) removeJoinedUser(roomID, userID string) {
 }

 // Not thread-safe: must be called on the OnNewEvent goroutine only
-func (n *Notifier) joinedUsers(roomID string) (userIDs []string) {
+func (n *Notifier) JoinedUsers(roomID string) (userIDs []string) {
+	n.mapLock.RLock()
+	defer n.mapLock.RUnlock()
 	if _, ok := n.roomIDToJoinedUsers[roomID]; !ok {
 		return
 	}
@ -401,6 +439,8 @@ func (n *Notifier) joinedUsers(roomID string) (userIDs []string) {

 // Not thread-safe: must be called on the OnNewEvent goroutine only
 func (n *Notifier) addPeekingDevice(roomID, userID, deviceID string) {
+	n.mapLock.Lock()
+	defer n.mapLock.Unlock()
 	if _, ok := n.roomIDToPeekingDevices[roomID]; !ok {
 		n.roomIDToPeekingDevices[roomID] = make(peekingDeviceSet)
 	}
@ -410,6 +450,8 @@ func (n *Notifier) addPeekingDevice(roomID, userID, deviceID string) {
 // Not thread-safe: must be called on the OnNewEvent goroutine only
 // nolint:unused
 func (n *Notifier) removePeekingDevice(roomID, userID, deviceID string) {
+	n.mapLock.Lock()
+	defer n.mapLock.Unlock()
 	if _, ok := n.roomIDToPeekingDevices[roomID]; !ok {
 		n.roomIDToPeekingDevices[roomID] = make(peekingDeviceSet)
 	}
@ -419,6 +461,8 @@ func (n *Notifier) removePeekingDevice(roomID, userID, deviceID string) {

 // Not thread-safe: must be called on the OnNewEvent goroutine only
 func (n *Notifier) PeekingDevices(roomID string) (peekingDevices []types.PeekingDevice) {
+	n.mapLock.RLock()
+	defer n.mapLock.RUnlock()
 	if _, ok := n.roomIDToPeekingDevices[roomID]; !ok {
 		return
 	}
--- a/syncapi/notifier/notifier_test.go
+++ b/syncapi/notifier/notifier_test.go
@ -107,7 +107,8 @@ func mustEqualPositions(t *testing.T, got, want types.StreamingToken) {

 // Test that the current position is returned if a request is already behind.
 func TestImmediateNotification(t *testing.T) {
-	n := NewNotifier(syncPositionBefore)
+	n := NewNotifier()
+	n.SetCurrentPosition(syncPositionBefore)
 	pos, err := waitForEvents(n, newTestSyncRequest(alice, aliceDev, syncPositionVeryOld))
 	if err != nil {
 		t.Fatalf("TestImmediateNotification error: %s", err)
@ -117,7 +118,8 @@ func TestImmediateNotification(t *testing.T) {

 // Test that new events to a joined room unblocks the request.
 func TestNewEventAndJoinedToRoom(t *testing.T) {
-	n := NewNotifier(syncPositionBefore)
+	n := NewNotifier()
+	n.SetCurrentPosition(syncPositionBefore)
 	n.setUsersJoinedToRooms(map[string][]string{
 		roomID: {alice, bob},
 	})
@ -142,7 +144,8 @@ func TestNewEventAndJoinedToRoom(t *testing.T) {
 }

 func TestCorrectStream(t *testing.T) {
-	n := NewNotifier(syncPositionBefore)
+	n := NewNotifier()
+	n.SetCurrentPosition(syncPositionBefore)
 	stream := lockedFetchUserStream(n, bob, bobDev)
 	if stream.UserID != bob {
 		t.Fatalf("expected user %q, got %q", bob, stream.UserID)
@ -153,7 +156,8 @@ func TestCorrectStream(t *testing.T) {
 }

 func TestCorrectStreamWakeup(t *testing.T) {
-	n := NewNotifier(syncPositionBefore)
+	n := NewNotifier()
+	n.SetCurrentPosition(syncPositionBefore)
 	awoken := make(chan string)

 	streamone := lockedFetchUserStream(n, alice, "one")
@ -180,7 +184,8 @@ func TestCorrectStreamWakeup(t *testing.T) {

 // Test that an invite unblocks the request
 func TestNewInviteEventForUser(t *testing.T) {
-	n := NewNotifier(syncPositionBefore)
+	n := NewNotifier()
+	n.SetCurrentPosition(syncPositionBefore)
 	n.setUsersJoinedToRooms(map[string][]string{
 		roomID: {alice, bob},
 	})
@ -236,7 +241,8 @@ func TestEDUWakeup(t *testing.T) {

 // Test that all blocked requests get woken up on a new event.
 func TestMultipleRequestWakeup(t *testing.T) {
-	n := NewNotifier(syncPositionBefore)
+	n := NewNotifier()
+	n.SetCurrentPosition(syncPositionBefore)
 	n.setUsersJoinedToRooms(map[string][]string{
 		roomID: {alice, bob},
 	})
@ -272,7 +278,8 @@ func TestMultipleRequestWakeup(t *testing.T) {
 func TestNewEventAndWasPreviouslyJoinedToRoom(t *testing.T) {
 	// listen as bob. Make bob leave room. Make alice send event to room.
 	// Make sure alice gets woken up only and not bob as well.
-	n := NewNotifier(syncPositionBefore)
+	n := NewNotifier()
+	n.SetCurrentPosition(syncPositionBefore)
 	n.setUsersJoinedToRooms(map[string][]string{
 		roomID: {alice, bob},
 	})
--- a/syncapi/producers/federationapi_presence.go
+++ b/syncapi/producers/federationapi_presence.go
@ -0,0 +1,48 @@
+// 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 producers
+
+import (
+	"strconv"
+	"time"
+
+	"github.com/matrix-org/dendrite/setup/jetstream"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/nats-io/nats.go"
+)
+
+// FederationAPIPresenceProducer produces events for the federation API server to consume
+type FederationAPIPresenceProducer struct {
+	Topic     string
+	JetStream nats.JetStreamContext
+}
+
+func (f *FederationAPIPresenceProducer) SendPresence(
+	userID string, presence types.Presence, statusMsg *string,
+) error {
+	msg := nats.NewMsg(f.Topic)
+	msg.Header.Set(jetstream.UserID, userID)
+	msg.Header.Set("presence", presence.String())
+	msg.Header.Set("from_sync", "true") // only update last_active_ts and presence
+	msg.Header.Set("last_active_ts", strconv.Itoa(int(gomatrixserverlib.AsTimestamp(time.Now()))))
+
+	if statusMsg != nil {
+		msg.Header.Set("status_msg", *statusMsg)
+	}
+
+	_, err := f.JetStream.PublishMsg(msg)
+	return err
+}
--- a/syncapi/storage/interface.go
+++ b/syncapi/storage/interface.go
@ -26,6 +26,7 @@ import (
 )

 type Database interface {
+	Presence
 	MaxStreamPositionForPDUs(ctx context.Context) (types.StreamPosition, error)
 	MaxStreamPositionForReceipts(ctx context.Context) (types.StreamPosition, error)
 	MaxStreamPositionForInvites(ctx context.Context) (types.StreamPosition, error)
@ -150,3 +151,10 @@ type Database interface {

 	StreamToTopologicalPosition(ctx context.Context, roomID string, streamPos types.StreamPosition, backwardOrdering bool) (types.TopologyToken, error)
 }
+
+type Presence interface {
+	UpdatePresence(ctx context.Context, userID string, presence types.Presence, statusMsg *string, lastActiveTS gomatrixserverlib.Timestamp, fromSync bool) (types.StreamPosition, error)
+	GetPresence(ctx context.Context, userID string) (*types.PresenceInternal, error)
+	PresenceAfter(ctx context.Context, after types.StreamPosition) (map[string]*types.PresenceInternal, error)
+	MaxStreamPositionForPresence(ctx context.Context) (types.StreamPosition, error)
+}
--- a/syncapi/storage/postgres/presence_table.go
+++ b/syncapi/storage/postgres/presence_table.go
@ -0,0 +1,162 @@
+// 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 postgres
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const presenceSchema = `
+CREATE SEQUENCE IF NOT EXISTS syncapi_presence_id;
+-- Stores data about presence
+CREATE TABLE IF NOT EXISTS syncapi_presence (
+	-- The ID
+	id BIGINT PRIMARY KEY DEFAULT nextval('syncapi_presence_id'),
+	-- The Matrix user ID
+	user_id TEXT NOT NULL,
+	-- The actual presence
+	presence INT NOT NULL,
+	-- The status message
+	status_msg TEXT,
+	-- The last time an action was received by this user
+	last_active_ts BIGINT NOT NULL,
+	CONSTRAINT presence_presences_unique UNIQUE (user_id)
+);
+CREATE INDEX IF NOT EXISTS syncapi_presence_user_id ON syncapi_presence(user_id);
+`
+
+const upsertPresenceSQL = "" +
+	"INSERT INTO syncapi_presence AS p" +
+	" (user_id, presence, status_msg, last_active_ts)" +
+	" VALUES ($1, $2, $3, $4)" +
+	" ON CONFLICT (user_id)" +
+	" DO UPDATE SET id = nextval('syncapi_presence_id')," +
+	" presence = $2, status_msg = COALESCE($3, p.status_msg), last_active_ts = $4" +
+	" RETURNING id"
+
+const upsertPresenceFromSyncSQL = "" +
+	"INSERT INTO syncapi_presence AS p" +
+	" (user_id, presence, last_active_ts)" +
+	" VALUES ($1, $2, $3)" +
+	" ON CONFLICT (user_id)" +
+	" DO UPDATE SET id = nextval('syncapi_presence_id')," +
+	" presence = $2, last_active_ts = $3" +
+	" RETURNING id"
+
+const selectPresenceForUserSQL = "" +
+	"SELECT presence, status_msg, last_active_ts" +
+	" FROM syncapi_presence" +
+	" WHERE user_id = $1 LIMIT 1"
+
+const selectMaxPresenceSQL = "" +
+	"SELECT COALESCE(MAX(id), 0) FROM syncapi_presence"
+
+const selectPresenceAfter = "" +
+	" SELECT id, user_id, presence, status_msg, last_active_ts" +
+	" FROM syncapi_presence" +
+	" WHERE id > $1"
+
+type presenceStatements struct {
+	upsertPresenceStmt         *sql.Stmt
+	upsertPresenceFromSyncStmt *sql.Stmt
+	selectPresenceForUsersStmt *sql.Stmt
+	selectMaxPresenceStmt      *sql.Stmt
+	selectPresenceAfterStmt    *sql.Stmt
+}
+
+func NewPostgresPresenceTable(db *sql.DB) (*presenceStatements, error) {
+	_, err := db.Exec(presenceSchema)
+	if err != nil {
+		return nil, err
+	}
+	s := &presenceStatements{}
+	return s, sqlutil.StatementList{
+		{&s.upsertPresenceStmt, upsertPresenceSQL},
+		{&s.upsertPresenceFromSyncStmt, upsertPresenceFromSyncSQL},
+		{&s.selectPresenceForUsersStmt, selectPresenceForUserSQL},
+		{&s.selectMaxPresenceStmt, selectMaxPresenceSQL},
+		{&s.selectPresenceAfterStmt, selectPresenceAfter},
+	}.Prepare(db)
+}
+
+// UpsertPresence creates/updates a presence status.
+func (p *presenceStatements) UpsertPresence(
+	ctx context.Context,
+	txn *sql.Tx,
+	userID string,
+	statusMsg *string,
+	presence types.Presence,
+	lastActiveTS gomatrixserverlib.Timestamp,
+	fromSync bool,
+) (pos types.StreamPosition, err error) {
+	if fromSync {
+		stmt := sqlutil.TxStmt(txn, p.upsertPresenceFromSyncStmt)
+		err = stmt.QueryRowContext(ctx, userID, presence, lastActiveTS).Scan(&pos)
+	} else {
+		stmt := sqlutil.TxStmt(txn, p.upsertPresenceStmt)
+		err = stmt.QueryRowContext(ctx, userID, presence, statusMsg, lastActiveTS).Scan(&pos)
+	}
+	return
+}
+
+// GetPresenceForUser returns the current presence of a user.
+func (p *presenceStatements) GetPresenceForUser(
+	ctx context.Context, txn *sql.Tx,
+	userID string,
+) (*types.PresenceInternal, error) {
+	result := &types.PresenceInternal{
+		UserID: userID,
+	}
+	stmt := sqlutil.TxStmt(txn, p.selectPresenceForUsersStmt)
+	err := stmt.QueryRowContext(ctx, userID).Scan(&result.Presence, &result.ClientFields.StatusMsg, &result.LastActiveTS)
+	result.ClientFields.Presence = result.Presence.String()
+	return result, err
+}
+
+func (p *presenceStatements) GetMaxPresenceID(ctx context.Context, txn *sql.Tx) (pos types.StreamPosition, err error) {
+	stmt := sqlutil.TxStmt(txn, p.selectMaxPresenceStmt)
+	err = stmt.QueryRowContext(ctx).Scan(&pos)
+	return
+}
+
+// GetPresenceAfter returns the changes presences after a given stream id
+func (p *presenceStatements) GetPresenceAfter(
+	ctx context.Context, txn *sql.Tx,
+	after types.StreamPosition,
+) (presences map[string]*types.PresenceInternal, err error) {
+	presences = make(map[string]*types.PresenceInternal)
+	stmt := sqlutil.TxStmt(txn, p.selectPresenceAfterStmt)
+
+	rows, err := stmt.QueryContext(ctx, after)
+	if err != nil {
+		return nil, err
+	}
+	defer internal.CloseAndLogIfError(ctx, rows, "GetPresenceAfter: failed to close rows")
+	for rows.Next() {
+		qryRes := &types.PresenceInternal{}
+		if err := rows.Scan(&qryRes.StreamPos, &qryRes.UserID, &qryRes.Presence, &qryRes.ClientFields.StatusMsg, &qryRes.LastActiveTS); err != nil {
+			return nil, err
+		}
+		qryRes.ClientFields.Presence = qryRes.Presence.String()
+		presences[qryRes.UserID] = qryRes
+	}
+	return presences, rows.Err()
+}
--- a/syncapi/storage/postgres/syncserver.go
+++ b/syncapi/storage/postgres/syncserver.go
@ -90,6 +90,10 @@ func NewDatabase(dbProperties *config.DatabaseOptions) (*SyncServerDatasource, e
 	if err != nil {
 		return nil, err
 	}
+	presence, err := NewPostgresPresenceTable(d.db)
+	if err != nil {
+		return nil, err
+	}
 	m := sqlutil.NewMigrations()
 	deltas.LoadFixSequences(m)
 	deltas.LoadRemoveSendToDeviceSentColumn(m)
@ -111,6 +115,7 @@ func NewDatabase(dbProperties *config.DatabaseOptions) (*SyncServerDatasource, e
 		Receipts:            receipts,
 		Memberships:         memberships,
 		NotificationData:    notificationData,
+		Presence:            presence,
 	}
 	return &d, nil
 }
--- a/syncapi/storage/shared/syncserver.go
+++ b/syncapi/storage/shared/syncserver.go
@ -48,6 +48,7 @@ type Database struct {
 	Receipts            tables.Receipts
 	Memberships         tables.Memberships
 	NotificationData    tables.NotificationData
+	Presence            tables.Presence
 }

 func (d *Database) readOnlySnapshot(ctx context.Context) (*sql.Tx, error) {
@ -1002,3 +1003,19 @@ func (s *Database) SelectContextBeforeEvent(ctx context.Context, id int, roomID
 func (s *Database) SelectContextAfterEvent(ctx context.Context, id int, roomID string, filter *gomatrixserverlib.RoomEventFilter) (int, []*gomatrixserverlib.HeaderedEvent, error) {
 	return s.OutputEvents.SelectContextAfterEvent(ctx, nil, id, roomID, filter)
 }
+
+func (s *Database) UpdatePresence(ctx context.Context, userID string, presence types.Presence, statusMsg *string, lastActiveTS gomatrixserverlib.Timestamp, fromSync bool) (types.StreamPosition, error) {
+	return s.Presence.UpsertPresence(ctx, nil, userID, statusMsg, presence, lastActiveTS, fromSync)
+}
+
+func (s *Database) GetPresence(ctx context.Context, userID string) (*types.PresenceInternal, error) {
+	return s.Presence.GetPresenceForUser(ctx, nil, userID)
+}
+
+func (s *Database) PresenceAfter(ctx context.Context, after types.StreamPosition) (map[string]*types.PresenceInternal, error) {
+	return s.Presence.GetPresenceAfter(ctx, nil, after)
+}
+
+func (s *Database) MaxStreamPositionForPresence(ctx context.Context) (types.StreamPosition, error) {
+	return s.Presence.GetMaxPresenceID(ctx, nil)
+}
--- a/syncapi/storage/sqlite3/presence_table.go
+++ b/syncapi/storage/sqlite3/presence_table.go
@ -0,0 +1,177 @@
+// 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 sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const presenceSchema = `
+-- Stores data about presence
+CREATE TABLE IF NOT EXISTS syncapi_presence (
+	-- The ID
+	id BIGINT NOT NULL,
+	-- The Matrix user ID
+	user_id TEXT NOT NULL,
+	-- The actual presence
+	presence INT NOT NULL,
+	-- The status message
+	status_msg TEXT,
+	-- The last time an action was received by this user
+	last_active_ts BIGINT NOT NULL,
+	CONSTRAINT presence_presences_unique UNIQUE (user_id)
+);
+CREATE INDEX IF NOT EXISTS syncapi_presence_user_id ON syncapi_presence(user_id);
+`
+
+const upsertPresenceSQL = "" +
+	"INSERT INTO syncapi_presence AS p" +
+	" (id, user_id, presence, status_msg, last_active_ts)" +
+	" VALUES ($1, $2, $3, $4, $5)" +
+	" ON CONFLICT (user_id)" +
+	" DO UPDATE SET id = $6, " +
+	" presence = $7, status_msg = COALESCE($8, p.status_msg), last_active_ts = $9" +
+	" RETURNING id"
+
+const upsertPresenceFromSyncSQL = "" +
+	"INSERT INTO syncapi_presence AS p" +
+	" (id, user_id, presence, last_active_ts)" +
+	" VALUES ($1, $2, $3, $4)" +
+	" ON CONFLICT (user_id)" +
+	" DO UPDATE SET id = $5, " +
+	" presence = $6, last_active_ts = $7" +
+	" RETURNING id"
+
+const selectPresenceForUserSQL = "" +
+	"SELECT presence, status_msg, last_active_ts" +
+	" FROM syncapi_presence" +
+	" WHERE user_id = $1 LIMIT 1"
+
+const selectMaxPresenceSQL = "" +
+	"SELECT COALESCE(MAX(id), 0) FROM syncapi_presence"
+
+const selectPresenceAfter = "" +
+	" SELECT id, user_id, presence, status_msg, last_active_ts" +
+	" FROM syncapi_presence" +
+	" WHERE id > $1"
+
+type presenceStatements struct {
+	db                         *sql.DB
+	streamIDStatements         *streamIDStatements
+	upsertPresenceStmt         *sql.Stmt
+	upsertPresenceFromSyncStmt *sql.Stmt
+	selectPresenceForUsersStmt *sql.Stmt
+	selectMaxPresenceStmt      *sql.Stmt
+	selectPresenceAfterStmt    *sql.Stmt
+}
+
+func NewSqlitePresenceTable(db *sql.DB, streamID *streamIDStatements) (*presenceStatements, error) {
+	_, err := db.Exec(presenceSchema)
+	if err != nil {
+		return nil, err
+	}
+	s := &presenceStatements{
+		db:                 db,
+		streamIDStatements: streamID,
+	}
+	return s, sqlutil.StatementList{
+		{&s.upsertPresenceStmt, upsertPresenceSQL},
+		{&s.upsertPresenceFromSyncStmt, upsertPresenceFromSyncSQL},
+		{&s.selectPresenceForUsersStmt, selectPresenceForUserSQL},
+		{&s.selectMaxPresenceStmt, selectMaxPresenceSQL},
+		{&s.selectPresenceAfterStmt, selectPresenceAfter},
+	}.Prepare(db)
+}
+
+// UpsertPresence creates/updates a presence status.
+func (p *presenceStatements) UpsertPresence(
+	ctx context.Context,
+	txn *sql.Tx,
+	userID string,
+	statusMsg *string,
+	presence types.Presence,
+	lastActiveTS gomatrixserverlib.Timestamp,
+	fromSync bool,
+) (pos types.StreamPosition, err error) {
+	pos, err = p.streamIDStatements.nextPresenceID(ctx, txn)
+	if err != nil {
+		return pos, err
+	}
+
+	if fromSync {
+		stmt := sqlutil.TxStmt(txn, p.upsertPresenceFromSyncStmt)
+		err = stmt.QueryRowContext(ctx,
+			pos, userID, presence,
+			lastActiveTS, pos,
+			presence, lastActiveTS).Scan(&pos)
+	} else {
+		stmt := sqlutil.TxStmt(txn, p.upsertPresenceStmt)
+		err = stmt.QueryRowContext(ctx,
+			pos, userID, presence,
+			statusMsg, lastActiveTS, pos,
+			presence, statusMsg, lastActiveTS).Scan(&pos)
+	}
+	return
+}
+
+// GetPresenceForUser returns the current presence of a user.
+func (p *presenceStatements) GetPresenceForUser(
+	ctx context.Context, txn *sql.Tx,
+	userID string,
+) (*types.PresenceInternal, error) {
+	result := &types.PresenceInternal{
+		UserID: userID,
+	}
+	stmt := sqlutil.TxStmt(txn, p.selectPresenceForUsersStmt)
+	err := stmt.QueryRowContext(ctx, userID).Scan(&result.Presence, &result.ClientFields.StatusMsg, &result.LastActiveTS)
+	result.ClientFields.Presence = result.Presence.String()
+	return result, err
+}
+
+func (p *presenceStatements) GetMaxPresenceID(ctx context.Context, txn *sql.Tx) (pos types.StreamPosition, err error) {
+	stmt := sqlutil.TxStmt(txn, p.selectMaxPresenceStmt)
+	err = stmt.QueryRowContext(ctx).Scan(&pos)
+	return
+}
+
+// GetPresenceAfter returns the changes presences after a given stream id
+func (p *presenceStatements) GetPresenceAfter(
+	ctx context.Context, txn *sql.Tx,
+	after types.StreamPosition,
+) (presences map[string]*types.PresenceInternal, err error) {
+	presences = make(map[string]*types.PresenceInternal)
+	stmt := sqlutil.TxStmt(txn, p.selectPresenceAfterStmt)
+
+	rows, err := stmt.QueryContext(ctx, after)
+	if err != nil {
+		return nil, err
+	}
+	defer internal.CloseAndLogIfError(ctx, rows, "GetPresenceAfter: failed to close rows")
+	for rows.Next() {
+		qryRes := &types.PresenceInternal{}
+		if err := rows.Scan(&qryRes.StreamPos, &qryRes.UserID, &qryRes.Presence, &qryRes.ClientFields.StatusMsg, &qryRes.LastActiveTS); err != nil {
+			return nil, err
+		}
+		qryRes.ClientFields.Presence = qryRes.Presence.String()
+		presences[qryRes.UserID] = qryRes
+	}
+	return presences, rows.Err()
+}
--- a/syncapi/storage/sqlite3/stream_id_table.go
+++ b/syncapi/storage/sqlite3/stream_id_table.go
@ -24,6 +24,8 @@ INSERT INTO syncapi_stream_id (stream_name, stream_id) VALUES ("accountdata", 0)
  ON CONFLICT DO NOTHING;
 INSERT INTO syncapi_stream_id (stream_name, stream_id) VALUES ("invite", 0)
  ON CONFLICT DO NOTHING;
+INSERT INTO syncapi_stream_id (stream_name, stream_id) VALUES ("presence", 0)
+  ON CONFLICT DO NOTHING;
 `

 const increaseStreamIDStmt = "" +
@ -70,3 +72,9 @@ func (s *streamIDStatements) nextAccountDataID(ctx context.Context, txn *sql.Tx)
 	err = increaseStmt.QueryRowContext(ctx, "accountdata").Scan(&pos)
 	return
 }
+
+func (s *streamIDStatements) nextPresenceID(ctx context.Context, txn *sql.Tx) (pos types.StreamPosition, err error) {
+	increaseStmt := sqlutil.TxStmt(txn, s.increaseStreamIDStmt)
+	err = increaseStmt.QueryRowContext(ctx, "presence").Scan(&pos)
+	return
+}
--- a/syncapi/storage/sqlite3/syncserver.go
+++ b/syncapi/storage/sqlite3/syncserver.go
@ -100,6 +100,10 @@ func (d *SyncServerDatasource) prepare(dbProperties *config.DatabaseOptions) (er
 	if err != nil {
 		return err
 	}
+	presence, err := NewSqlitePresenceTable(d.db, &d.streamID)
+	if err != nil {
+		return err
+	}
 	m := sqlutil.NewMigrations()
 	deltas.LoadFixSequences(m)
 	deltas.LoadRemoveSendToDeviceSentColumn(m)
@ -121,6 +125,7 @@ func (d *SyncServerDatasource) prepare(dbProperties *config.DatabaseOptions) (er
 		Receipts:            receipts,
 		Memberships:         memberships,
 		NotificationData:    notificationData,
+		Presence:            presence,
 	}
 	return nil
 }
--- a/syncapi/storage/tables/interface.go
+++ b/syncapi/storage/tables/interface.go
@ -182,3 +182,10 @@ type NotificationData interface {
 	SelectUserUnreadCounts(ctx context.Context, userID string, fromExcl, toIncl types.StreamPosition) (map[string]*eventutil.NotificationData, error)
 	SelectMaxID(ctx context.Context) (int64, error)
 }
+
+type Presence interface {
+	UpsertPresence(ctx context.Context, txn *sql.Tx, userID string, statusMsg *string, presence types.Presence, lastActiveTS gomatrixserverlib.Timestamp, fromSync bool) (pos types.StreamPosition, err error)
+	GetPresenceForUser(ctx context.Context, txn *sql.Tx, userID string) (presence *types.PresenceInternal, err error)
+	GetMaxPresenceID(ctx context.Context, txn *sql.Tx) (pos types.StreamPosition, err error)
+	GetPresenceAfter(ctx context.Context, txn *sql.Tx, after types.StreamPosition) (presences map[string]*types.PresenceInternal, err error)
+}
--- a/syncapi/streams/stream_presence.go
+++ b/syncapi/streams/stream_presence.go
@ -0,0 +1,179 @@
+// 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 streams
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"sync"
+
+	"github.com/matrix-org/dendrite/syncapi/notifier"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+type PresenceStreamProvider struct {
+	StreamProvider
+	// cache contains previously sent presence updates to avoid unneeded updates
+	cache    sync.Map
+	notifier *notifier.Notifier
+}
+
+func (p *PresenceStreamProvider) Setup() {
+	p.StreamProvider.Setup()
+
+	id, err := p.DB.MaxStreamPositionForPresence(context.Background())
+	if err != nil {
+		panic(err)
+	}
+	p.latest = id
+}
+
+func (p *PresenceStreamProvider) CompleteSync(
+	ctx context.Context,
+	req *types.SyncRequest,
+) types.StreamPosition {
+	return p.IncrementalSync(ctx, req, 0, p.LatestPosition(ctx))
+}
+
+func (p *PresenceStreamProvider) IncrementalSync(
+	ctx context.Context,
+	req *types.SyncRequest,
+	from, to types.StreamPosition,
+) types.StreamPosition {
+	presences, err := p.DB.PresenceAfter(ctx, from)
+	if err != nil {
+		req.Log.WithError(err).Error("p.DB.PresenceAfter failed")
+		return from
+	}
+
+	if len(presences) == 0 {
+		return to
+	}
+
+	// get all joined users
+	// TODO: SharedUsers might get out of sync
+	sharedUsers := p.notifier.SharedUsers(req.Device.UserID)
+
+	sharedUsersMap := map[string]bool{
+		req.Device.UserID: true,
+	}
+	// convert array to a map for easier checking if a user exists
+	for i := range sharedUsers {
+		sharedUsersMap[sharedUsers[i]] = true
+	}
+
+	// add newly joined rooms user presences
+	newlyJoined := joinedRooms(req.Response, req.Device.UserID)
+	if len(newlyJoined) > 0 {
+		// TODO: This refreshes all lists and is quite expensive
+		// The notifier should update the lists itself
+		if err = p.notifier.Load(ctx, p.DB); err != nil {
+			req.Log.WithError(err).Error("unable to refresh notifier lists")
+			return from
+		}
+		for _, roomID := range newlyJoined {
+			roomUsers := p.notifier.JoinedUsers(roomID)
+			for i := range roomUsers {
+				sharedUsersMap[roomUsers[i]] = true
+				// we already got a presence from this user
+				if _, ok := presences[roomUsers[i]]; ok {
+					continue
+				}
+				presences[roomUsers[i]], err = p.DB.GetPresence(ctx, roomUsers[i])
+				if err != nil {
+					if err == sql.ErrNoRows {
+						continue
+					}
+					req.Log.WithError(err).Error("unable to query presence for user")
+					return from
+				}
+			}
+		}
+	}
+
+	lastPos := to
+	for i := range presences {
+		presence := presences[i]
+		// Ignore users we don't share a room with
+		if !sharedUsersMap[presence.UserID] {
+			continue
+		}
+		cacheKey := req.Device.UserID + req.Device.ID + presence.UserID
+		pres, ok := p.cache.Load(cacheKey)
+		if ok {
+			// skip already sent presence
+			prevPresence := pres.(*types.PresenceInternal)
+			currentlyActive := prevPresence.CurrentlyActive()
+			skip := prevPresence.Equals(presence) && currentlyActive && req.Device.UserID != presence.UserID
+			if skip {
+				req.Log.Debugf("Skipping presence, no change (%s)", presence.UserID)
+				continue
+			}
+		}
+		presence.ClientFields.LastActiveAgo = presence.LastActiveAgo()
+		if presence.ClientFields.Presence == "online" {
+			currentlyActive := presence.CurrentlyActive()
+			presence.ClientFields.CurrentlyActive = &currentlyActive
+		}
+
+		content, err := json.Marshal(presence.ClientFields)
+		if err != nil {
+			return from
+		}
+
+		req.Response.Presence.Events = append(req.Response.Presence.Events, gomatrixserverlib.ClientEvent{
+			Content: content,
+			Sender:  presence.UserID,
+			Type:    gomatrixserverlib.MPresence,
+		})
+		if presence.StreamPos > lastPos {
+			lastPos = presence.StreamPos
+		}
+		p.cache.Store(cacheKey, presence)
+	}
+
+	return lastPos
+}
+
+func joinedRooms(res *types.Response, userID string) []string {
+	var roomIDs []string
+	for roomID, join := range res.Rooms.Join {
+		// we would expect to see our join event somewhere if we newly joined the room.
+		// Normal events get put in the join section so it's not enough to know the room ID is present in 'join'.
+		newlyJoined := membershipEventPresent(join.State.Events, userID)
+		if newlyJoined {
+			roomIDs = append(roomIDs, roomID)
+			continue
+		}
+		newlyJoined = membershipEventPresent(join.Timeline.Events, userID)
+		if newlyJoined {
+			roomIDs = append(roomIDs, roomID)
+		}
+	}
+	return roomIDs
+}
+
+func membershipEventPresent(events []gomatrixserverlib.ClientEvent, userID string) bool {
+	for _, ev := range events {
+		// it's enough to know that we have our member event here, don't need to check membership content
+		// as it's implied by being in the respective section of the sync response.
+		if ev.Type == gomatrixserverlib.MRoomMember && ev.StateKey != nil && *ev.StateKey == userID {
+			return true
+		}
+	}
+	return false
+}
--- a/syncapi/streams/streams.go
+++ b/syncapi/streams/streams.go
@ -6,6 +6,7 @@ import (
 	"github.com/matrix-org/dendrite/internal/caching"
 	keyapi "github.com/matrix-org/dendrite/keyserver/api"
 	rsapi "github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/syncapi/notifier"
 	"github.com/matrix-org/dendrite/syncapi/storage"
 	"github.com/matrix-org/dendrite/syncapi/types"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
@ -20,12 +21,13 @@ type Streams struct {
 	AccountDataStreamProvider      types.StreamProvider
 	DeviceListStreamProvider       types.StreamProvider
 	NotificationDataStreamProvider types.StreamProvider
+	PresenceStreamProvider         types.StreamProvider
 }

 func NewSyncStreamProviders(
 	d storage.Database, userAPI userapi.UserInternalAPI,
 	rsAPI rsapi.RoomserverInternalAPI, keyAPI keyapi.KeyInternalAPI,
-	eduCache *caching.EDUCache,
+	eduCache *caching.EDUCache, notifier *notifier.Notifier,
 ) *Streams {
 	streams := &Streams{
 		PDUStreamProvider: &PDUStreamProvider{
@ -56,6 +58,10 @@ func NewSyncStreamProviders(
 			rsAPI:          rsAPI,
 			keyAPI:         keyAPI,
 		},
+		PresenceStreamProvider: &PresenceStreamProvider{
+			StreamProvider: StreamProvider{DB: d},
+			notifier:       notifier,
+		},
 	}

 	streams.PDUStreamProvider.Setup()
@ -66,6 +72,7 @@ func NewSyncStreamProviders(
 	streams.AccountDataStreamProvider.Setup()
 	streams.NotificationDataStreamProvider.Setup()
 	streams.DeviceListStreamProvider.Setup()
+	streams.PresenceStreamProvider.Setup()

 	return streams
 }
@ -80,5 +87,6 @@ func (s *Streams) Latest(ctx context.Context) types.StreamingToken {
 		AccountDataPosition:      s.AccountDataStreamProvider.LatestPosition(ctx),
 		NotificationDataPosition: s.NotificationDataStreamProvider.LatestPosition(ctx),
 		DeviceListPosition:       s.DeviceListStreamProvider.LatestPosition(ctx),
+		PresencePosition:         s.PresenceStreamProvider.LatestPosition(ctx),
 	}
 }
--- a/syncapi/sync/requestpool.go
+++ b/syncapi/sync/requestpool.go
@ -17,6 +17,8 @@
 package sync

 import (
+	"context"
+	"database/sql"
 	"net"
 	"net/http"
 	"strings"
@ -33,8 +35,10 @@ import (
 	"github.com/matrix-org/dendrite/syncapi/streams"
 	"github.com/matrix-org/dendrite/syncapi/types"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/sirupsen/logrus"
 )

 // RequestPool manages HTTP long-poll connections for /sync
@ -44,9 +48,15 @@ type RequestPool struct {
 	userAPI  userapi.UserInternalAPI
 	keyAPI   keyapi.KeyInternalAPI
 	rsAPI    roomserverAPI.RoomserverInternalAPI
-	lastseen sync.Map
+	lastseen *sync.Map
+	presence *sync.Map
 	streams  *streams.Streams
 	Notifier *notifier.Notifier
+	producer PresencePublisher
+}
+
+type PresencePublisher interface {
+	SendPresence(userID string, presence types.Presence, statusMsg *string) error
 }

 // NewRequestPool makes a new RequestPool
@ -55,6 +65,7 @@ func NewRequestPool(
 	userAPI userapi.UserInternalAPI, keyAPI keyapi.KeyInternalAPI,
 	rsAPI roomserverAPI.RoomserverInternalAPI,
 	streams *streams.Streams, notifier *notifier.Notifier,
+	producer PresencePublisher,
 ) *RequestPool {
 	rp := &RequestPool{
 		db:       db,
@ -62,11 +73,14 @@ func NewRequestPool(
 		userAPI:  userAPI,
 		keyAPI:   keyAPI,
 		rsAPI:    rsAPI,
-		lastseen: sync.Map{},
+		lastseen: &sync.Map{},
+		presence: &sync.Map{},
 		streams:  streams,
 		Notifier: notifier,
+		producer: producer,
 	}
 	go rp.cleanLastSeen()
+	go rp.cleanPresence(db, time.Minute*5)
 	return rp
 }

@ -80,6 +94,68 @@ func (rp *RequestPool) cleanLastSeen() {
 	}
 }

+func (rp *RequestPool) cleanPresence(db storage.Presence, cleanupTime time.Duration) {
+	if !rp.cfg.Matrix.Presence.EnableOutbound {
+		return
+	}
+	for {
+		rp.presence.Range(func(key interface{}, v interface{}) bool {
+			p := v.(types.PresenceInternal)
+			if time.Since(p.LastActiveTS.Time()) > cleanupTime {
+				rp.updatePresence(db, types.PresenceUnavailable.String(), p.UserID)
+				rp.presence.Delete(key)
+			}
+			return true
+		})
+		time.Sleep(cleanupTime)
+	}
+}
+
+// updatePresence sends presence updates to the SyncAPI and FederationAPI
+func (rp *RequestPool) updatePresence(db storage.Presence, presence string, userID string) {
+	if !rp.cfg.Matrix.Presence.EnableOutbound {
+		return
+	}
+	if presence == "" {
+		presence = types.PresenceOnline.String()
+	}
+
+	presenceID, ok := types.PresenceFromString(presence)
+	if !ok { // this should almost never happen
+		logrus.Errorf("unknown presence '%s'", presence)
+		return
+	}
+
+	newPresence := types.PresenceInternal{
+		ClientFields: types.PresenceClientResponse{
+			Presence: presenceID.String(),
+		},
+		Presence:     presenceID,
+		UserID:       userID,
+		LastActiveTS: gomatrixserverlib.AsTimestamp(time.Now()),
+	}
+	defer rp.presence.Store(userID, newPresence)
+	// avoid spamming presence updates when syncing
+	existingPresence, ok := rp.presence.LoadOrStore(userID, newPresence)
+	if ok {
+		p := existingPresence.(types.PresenceInternal)
+		if p.ClientFields.Presence == newPresence.ClientFields.Presence {
+			return
+		}
+	}
+
+	// ensure we also send the current status_msg to federated servers and not nil
+	dbPresence, err := db.GetPresence(context.Background(), userID)
+	if err != nil && err != sql.ErrNoRows {
+		return
+	}
+
+	if err := rp.producer.SendPresence(userID, presenceID, dbPresence.ClientFields.StatusMsg); err != nil {
+		logrus.WithError(err).Error("Unable to publish presence message from sync")
+		return
+	}
+}
+
 func (rp *RequestPool) updateLastSeen(req *http.Request, device *userapi.Device) {
 	if _, ok := rp.lastseen.LoadOrStore(device.UserID+device.ID, struct{}{}); ok {
 		return
@ -156,6 +232,7 @@ func (rp *RequestPool) OnIncomingSyncRequest(req *http.Request, device *userapi.
 	defer activeSyncRequests.Dec()

 	rp.updateLastSeen(req, device)
+	rp.updatePresence(rp.db, req.FormValue("set_presence"), device.UserID)

 	waitingSyncRequests.Inc()
 	defer waitingSyncRequests.Dec()
@ -219,6 +296,9 @@ func (rp *RequestPool) OnIncomingSyncRequest(req *http.Request, device *userapi.
 			DeviceListPosition: rp.streams.DeviceListStreamProvider.CompleteSync(
 				syncReq.Context, syncReq,
 			),
+			PresencePosition: rp.streams.PresenceStreamProvider.CompleteSync(
+				syncReq.Context, syncReq,
+			),
 		}
 	} else {
 		// Incremental sync
@ -255,6 +335,10 @@ func (rp *RequestPool) OnIncomingSyncRequest(req *http.Request, device *userapi.
 				syncReq.Context, syncReq,
 				syncReq.Since.DeviceListPosition, currentPos.DeviceListPosition,
 			),
+			PresencePosition: rp.streams.PresenceStreamProvider.IncrementalSync(
+				syncReq.Context, syncReq,
+				syncReq.Since.PresencePosition, currentPos.PresencePosition,
+			),
 		}
 	}

--- a/syncapi/sync/requestpool_test.go
+++ b/syncapi/sync/requestpool_test.go
@ -0,0 +1,128 @@
+package sync
+
+import (
+	"context"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+type dummyPublisher struct {
+	count int
+}
+
+func (d *dummyPublisher) SendPresence(userID string, presence types.Presence, statusMsg *string) error {
+	d.count++
+	return nil
+}
+
+type dummyDB struct{}
+
+func (d dummyDB) UpdatePresence(ctx context.Context, userID string, presence types.Presence, statusMsg *string, lastActiveTS gomatrixserverlib.Timestamp, fromSync bool) (types.StreamPosition, error) {
+	return 0, nil
+}
+
+func (d dummyDB) GetPresence(ctx context.Context, userID string) (*types.PresenceInternal, error) {
+	return &types.PresenceInternal{}, nil
+}
+
+func (d dummyDB) PresenceAfter(ctx context.Context, after types.StreamPosition) (map[string]*types.PresenceInternal, error) {
+	return map[string]*types.PresenceInternal{}, nil
+}
+
+func (d dummyDB) MaxStreamPositionForPresence(ctx context.Context) (types.StreamPosition, error) {
+	return 0, nil
+}
+
+func TestRequestPool_updatePresence(t *testing.T) {
+	type args struct {
+		presence string
+		userID   string
+		sleep    time.Duration
+	}
+	publisher := &dummyPublisher{}
+	syncMap := sync.Map{}
+
+	tests := []struct {
+		name         string
+		args         args
+		wantIncrease bool
+	}{
+		{
+			name:         "new presence is published",
+			wantIncrease: true,
+			args: args{
+				userID: "dummy",
+			},
+		},
+		{
+			name: "presence not published, no change",
+			args: args{
+				userID: "dummy",
+			},
+		},
+		{
+			name:         "new presence is published dummy2",
+			wantIncrease: true,
+			args: args{
+				userID:   "dummy2",
+				presence: "online",
+			},
+		},
+		{
+			name:         "different presence is published dummy2",
+			wantIncrease: true,
+			args: args{
+				userID:   "dummy2",
+				presence: "unavailable",
+			},
+		},
+		{
+			name: "same presence is not published dummy2",
+			args: args{
+				userID:   "dummy2",
+				presence: "unavailable",
+				sleep:    time.Millisecond * 150,
+			},
+		},
+		{
+			name:         "same presence is published after being deleted",
+			wantIncrease: true,
+			args: args{
+				userID:   "dummy2",
+				presence: "unavailable",
+			},
+		},
+	}
+	rp := &RequestPool{
+		presence: &syncMap,
+		producer: publisher,
+		cfg: &config.SyncAPI{
+			Matrix: &config.Global{
+				JetStream: config.JetStream{
+					TopicPrefix: "Dendrite",
+				},
+				Presence: config.PresenceOptions{
+					EnableInbound:  true,
+					EnableOutbound: true,
+				},
+			},
+		},
+	}
+	db := dummyDB{}
+	go rp.cleanPresence(db, time.Millisecond*50)
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			beforeCount := publisher.count
+			rp.updatePresence(db, tt.args.presence, tt.args.userID)
+			if tt.wantIncrease && publisher.count <= beforeCount {
+				t.Fatalf("expected count to increase: %d <= %d", publisher.count, beforeCount)
+			}
+			time.Sleep(tt.args.sleep)
+		})
+	}
+}
--- a/syncapi/syncapi.go
+++ b/syncapi/syncapi.go
@ -49,7 +49,7 @@ func AddPublicRoutes(
 	federation *gomatrixserverlib.FederationClient,
 	cfg *config.SyncAPI,
 ) {
-	js, _ := jetstream.Prepare(process, &cfg.Matrix.JetStream)
+	js, natsClient := jetstream.Prepare(process, &cfg.Matrix.JetStream)

 	syncDB, err := storage.NewSyncServerDatasource(&cfg.Database)
 	if err != nil {
@ -57,13 +57,19 @@ func AddPublicRoutes(
 	}

 	eduCache := caching.NewTypingCache()
-	streams := streams.NewSyncStreamProviders(syncDB, userAPI, rsAPI, keyAPI, eduCache)
-	notifier := notifier.NewNotifier(streams.Latest(context.Background()))
+	notifier := notifier.NewNotifier()
+	streams := streams.NewSyncStreamProviders(syncDB, userAPI, rsAPI, keyAPI, eduCache, notifier)
+	notifier.SetCurrentPosition(streams.Latest(context.Background()))
 	if err = notifier.Load(context.Background(), syncDB); err != nil {
 		logrus.WithError(err).Panicf("failed to load notifier ")
 	}

-	requestPool := sync.NewRequestPool(syncDB, cfg, userAPI, keyAPI, rsAPI, streams, notifier)
+	federationPresenceProducer := &producers.FederationAPIPresenceProducer{
+		Topic:     cfg.Matrix.JetStream.Prefixed(jetstream.OutputPresenceEvent),
+		JetStream: js,
+	}
+
+	requestPool := sync.NewRequestPool(syncDB, cfg, userAPI, keyAPI, rsAPI, streams, notifier, federationPresenceProducer)

 	userAPIStreamEventProducer := &producers.UserAPIStreamEventProducer{
 		JetStream: js,
@ -75,8 +81,6 @@ func AddPublicRoutes(
 		Topic:     cfg.Matrix.JetStream.Prefixed(jetstream.OutputReadUpdate),
 	}

-	_ = userAPIReadUpdateProducer
-
 	keyChangeConsumer := consumers.NewOutputKeyChangeEventConsumer(
 		process, cfg, cfg.Matrix.JetStream.Prefixed(jetstream.OutputKeyChangeEvent),
 		js, keyAPI, rsAPI, syncDB, notifier,
@ -131,5 +135,14 @@ func AddPublicRoutes(
 		logrus.WithError(err).Panicf("failed to start receipts consumer")
 	}

+	presenceConsumer := consumers.NewPresenceConsumer(
+		process, cfg, js, natsClient, syncDB,
+		notifier, streams.PresenceStreamProvider,
+		userAPI,
+	)
+	if err = presenceConsumer.Start(); err != nil {
+		logrus.WithError(err).Panicf("failed to start presence consumer")
+	}
+
 	routing.Setup(router, requestPool, syncDB, userAPI, federation, rsAPI, cfg)
 }
--- a/syncapi/types/presence.go
+++ b/syncapi/types/presence.go
@ -0,0 +1,75 @@
+// 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 types
+
+import (
+	"strings"
+	"time"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+//go:generate stringer -type=Presence -linecomment
+type Presence uint8
+
+const (
+	PresenceUnavailable Presence = iota + 1 // unavailable
+	PresenceOnline                          // online
+	PresenceOffline                         // offline
+)
+
+// PresenceFromString returns the integer representation of the given input presence.
+// Returns false for ok, if input is not a valid presence value.
+func PresenceFromString(input string) (p Presence, ok bool) {
+	for i := 0; i < len(_Presence_index)-1; i++ {
+		l, r := _Presence_index[i], _Presence_index[i+1]
+		if strings.EqualFold(input, _Presence_name[l:r]) {
+			return Presence(i + 1), true
+		}
+	}
+	return 0, false
+}
+
+type PresenceInternal struct {
+	ClientFields PresenceClientResponse
+	StreamPos    StreamPosition              `json:"-"`
+	UserID       string                      `json:"-"`
+	LastActiveTS gomatrixserverlib.Timestamp `json:"-"`
+	Presence     Presence                    `json:"-"`
+}
+
+// Equals compares p1 with p2.
+func (p1 *PresenceInternal) Equals(p2 *PresenceInternal) bool {
+	return p1.ClientFields.Presence == p2.ClientFields.Presence &&
+		p1.ClientFields.StatusMsg == p2.ClientFields.StatusMsg &&
+		p1.UserID == p2.UserID
+}
+
+// CurrentlyActive returns the current active state.
+func (p *PresenceInternal) CurrentlyActive() bool {
+	return time.Since(p.LastActiveTS.Time()).Minutes() < 5
+}
+
+// LastActiveAgo returns the time since the LastActiveTS in milliseconds.
+func (p *PresenceInternal) LastActiveAgo() int64 {
+	return time.Since(p.LastActiveTS.Time()).Milliseconds()
+}
+
+type PresenceClientResponse struct {
+	CurrentlyActive *bool   `json:"currently_active,omitempty"`
+	LastActiveAgo   int64   `json:"last_active_ago,omitempty"`
+	Presence        string  `json:"presence"`
+	StatusMsg       *string `json:"status_msg,omitempty"`
+}
--- a/syncapi/types/presence_string.go
+++ b/syncapi/types/presence_string.go
@ -0,0 +1,26 @@
+// Code generated by "stringer -type=Presence -linecomment"; DO NOT EDIT.
+
+package types
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[PresenceUnavailable-1]
+	_ = x[PresenceOnline-2]
+	_ = x[PresenceOffline-3]
+}
+
+const _Presence_name = "unavailableonlineoffline"
+
+var _Presence_index = [...]uint8{0, 11, 17, 24}
+
+func (i Presence) String() string {
+	i -= 1
+	if i >= Presence(len(_Presence_index)-1) {
+		return "Presence(" + strconv.FormatInt(int64(i+1), 10) + ")"
+	}
+	return _Presence_name[_Presence_index[i]:_Presence_index[i+1]]
+}
--- a/syncapi/types/presence_test.go
+++ b/syncapi/types/presence_test.go
@ -0,0 +1,42 @@
+package types
+
+import "testing"
+
+func TestPresenceFromString(t *testing.T) {
+	tests := []struct {
+		name       string
+		input      string
+		wantStatus Presence
+		wantOk     bool
+	}{
+		{
+			name:       "presence unavailable",
+			input:      "unavailable",
+			wantStatus: PresenceUnavailable,
+			wantOk:     true,
+		},
+		{
+			name:       "presence online",
+			input:      "OnLINE",
+			wantStatus: PresenceOnline,
+			wantOk:     true,
+		},
+		{
+			name:       "unknown presence",
+			input:      "unknown",
+			wantStatus: 0,
+			wantOk:     false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, got1 := PresenceFromString(tt.input)
+			if got != tt.wantStatus {
+				t.Errorf("PresenceFromString() got = %v, want %v", got, tt.wantStatus)
+			}
+			if got1 != tt.wantOk {
+				t.Errorf("PresenceFromString() got1 = %v, want %v", got1, tt.wantOk)
+			}
+		})
+	}
+}
--- a/syncapi/types/types.go
+++ b/syncapi/types/types.go
@ -103,6 +103,7 @@ type StreamingToken struct {
 	AccountDataPosition      StreamPosition
 	DeviceListPosition       StreamPosition
 	NotificationDataPosition StreamPosition
+	PresencePosition         StreamPosition
 }

 // This will be used as a fallback by json.Marshal.
@ -118,11 +119,12 @@ func (s *StreamingToken) UnmarshalText(text []byte) (err error) {

 func (t StreamingToken) String() string {
 	posStr := fmt.Sprintf(
-		"s%d_%d_%d_%d_%d_%d_%d_%d",
+		"s%d_%d_%d_%d_%d_%d_%d_%d_%d",
 		t.PDUPosition, t.TypingPosition,
 		t.ReceiptPosition, t.SendToDevicePosition,
 		t.InvitePosition, t.AccountDataPosition,
 		t.DeviceListPosition, t.NotificationDataPosition,
+		t.PresencePosition,
 	)
 	return posStr
 }
@ -146,12 +148,14 @@ func (t *StreamingToken) IsAfter(other StreamingToken) bool {
 		return true
 	case t.NotificationDataPosition > other.NotificationDataPosition:
 		return true
+	case t.PresencePosition > other.PresencePosition:
+		return true
 	}
 	return false
 }

 func (t *StreamingToken) IsEmpty() bool {
-	return t == nil || t.PDUPosition+t.TypingPosition+t.ReceiptPosition+t.SendToDevicePosition+t.InvitePosition+t.AccountDataPosition+t.DeviceListPosition+t.NotificationDataPosition == 0
+	return t == nil || t.PDUPosition+t.TypingPosition+t.ReceiptPosition+t.SendToDevicePosition+t.InvitePosition+t.AccountDataPosition+t.DeviceListPosition+t.NotificationDataPosition+t.PresencePosition == 0
 }

 // WithUpdates returns a copy of the StreamingToken with updates applied from another StreamingToken.
@ -192,6 +196,9 @@ func (t *StreamingToken) ApplyUpdates(other StreamingToken) {
 	if other.NotificationDataPosition > t.NotificationDataPosition {
 		t.NotificationDataPosition = other.NotificationDataPosition
 	}
+	if other.PresencePosition > t.PresencePosition {
+		t.PresencePosition = other.PresencePosition
+	}
 }

 type TopologyToken struct {
@ -284,7 +291,7 @@ func NewStreamTokenFromString(tok string) (token StreamingToken, err error) {
 	// s478_0_0_0_0_13.dl-0-2 but we have now removed partitioned stream positions
 	tok = strings.Split(tok, ".")[0]
 	parts := strings.Split(tok[1:], "_")
-	var positions [8]StreamPosition
+	var positions [9]StreamPosition
 	for i, p := range parts {
 		if i >= len(positions) {
 			break
@ -306,6 +313,7 @@ func NewStreamTokenFromString(tok string) (token StreamingToken, err error) {
 		AccountDataPosition:      positions[5],
 		DeviceListPosition:       positions[6],
 		NotificationDataPosition: positions[7],
+		PresencePosition:         positions[8],
 	}
 	return token, nil
 }
--- a/syncapi/types/types_test.go
+++ b/syncapi/types/types_test.go
@ -9,9 +9,9 @@ import (

 func TestSyncTokens(t *testing.T) {
 	shouldPass := map[string]string{
-		"s4_0_0_0_0_0_0_0": StreamingToken{4, 0, 0, 0, 0, 0, 0, 0}.String(),
-		"s3_1_0_0_0_0_2_0": StreamingToken{3, 1, 0, 0, 0, 0, 2, 0}.String(),
-		"s3_1_2_3_5_0_0_0": StreamingToken{3, 1, 2, 3, 5, 0, 0, 0}.String(),
+		"s4_0_0_0_0_0_0_0_3": StreamingToken{4, 0, 0, 0, 0, 0, 0, 0, 3}.String(),
+		"s3_1_0_0_0_0_2_0_5": StreamingToken{3, 1, 0, 0, 0, 0, 2, 0, 5}.String(),
+		"s3_1_2_3_5_0_0_0_6": StreamingToken{3, 1, 2, 3, 5, 0, 0, 0, 6}.String(),
 		"t3_1":               TopologyToken{3, 1}.String(),
 	}

--- a/14
+++ b/14
@ -679,6 +679,20 @@ remote user has push rules copied to upgraded room
 /upgrade of a bogus room fails gracefully
 Cannot send tombstone event that points to the same room
 Room summary counts change when membership changes
+GET /presence/:user_id/status fetches initial status
+PUT /presence/:user_id/status updates my presence
+Presence change reports an event to myself
+Existing members see new members' presence
+#Existing members see new member's presence
+Newly joined room includes presence in incremental sync
+Get presence for newly joined members in incremental sync
+User sees their own presence in a sync
+User sees updates to presence from other users in the incremental sync.
+Presence changes are reported to local room members
+Presence changes are also reported to remote room members
+Presence changes to UNAVAILABLE are reported to local room members
+Presence changes to UNAVAILABLE are reported to remote room members
+New federated private chats get full presence information (SYN-115)
 /upgrade copies >100 power levels to the new room
 Room state after a rejected message event is the same as before
 Room state after a rejected state event is the same as before
--- a/userapi/api/api.go
+++ b/userapi/api/api.go
@ -31,12 +31,10 @@ type UserInternalAPI interface {
 	UserRegisterAPI
 	UserAccountAPI
 	UserThreePIDAPI
+	UserDeviceAPI

 	InputAccountData(ctx context.Context, req *InputAccountDataRequest, res *InputAccountDataResponse) error

-	PerformDeviceDeletion(ctx context.Context, req *PerformDeviceDeletionRequest, res *PerformDeviceDeletionResponse) error
-	PerformLastSeenUpdate(ctx context.Context, req *PerformLastSeenUpdateRequest, res *PerformLastSeenUpdateResponse) error
-	PerformDeviceUpdate(ctx context.Context, req *PerformDeviceUpdateRequest, res *PerformDeviceUpdateResponse) error
 	PerformOpenIDTokenCreation(ctx context.Context, req *PerformOpenIDTokenCreationRequest, res *PerformOpenIDTokenCreationResponse) error
 	PerformKeyBackup(ctx context.Context, req *PerformKeyBackupRequest, res *PerformKeyBackupResponse) error
 	PerformPusherSet(ctx context.Context, req *PerformPusherSetRequest, res *struct{}) error
@ -45,15 +43,21 @@ type UserInternalAPI interface {

 	QueryKeyBackup(ctx context.Context, req *QueryKeyBackupRequest, res *QueryKeyBackupResponse)
 	QueryAccessToken(ctx context.Context, req *QueryAccessTokenRequest, res *QueryAccessTokenResponse) error
-	QueryDevices(ctx context.Context, req *QueryDevicesRequest, res *QueryDevicesResponse) error
 	QueryAccountData(ctx context.Context, req *QueryAccountDataRequest, res *QueryAccountDataResponse) error
-	QueryDeviceInfos(ctx context.Context, req *QueryDeviceInfosRequest, res *QueryDeviceInfosResponse) error
 	QueryOpenIDToken(ctx context.Context, req *QueryOpenIDTokenRequest, res *QueryOpenIDTokenResponse) error
 	QueryPushers(ctx context.Context, req *QueryPushersRequest, res *QueryPushersResponse) error
 	QueryPushRules(ctx context.Context, req *QueryPushRulesRequest, res *QueryPushRulesResponse) error
 	QueryNotifications(ctx context.Context, req *QueryNotificationsRequest, res *QueryNotificationsResponse) error
 }

+type UserDeviceAPI interface {
+	PerformDeviceDeletion(ctx context.Context, req *PerformDeviceDeletionRequest, res *PerformDeviceDeletionResponse) error
+	PerformLastSeenUpdate(ctx context.Context, req *PerformLastSeenUpdateRequest, res *PerformLastSeenUpdateResponse) error
+	PerformDeviceUpdate(ctx context.Context, req *PerformDeviceUpdateRequest, res *PerformDeviceUpdateResponse) error
+	QueryDevices(ctx context.Context, req *QueryDevicesRequest, res *QueryDevicesResponse) error
+	QueryDeviceInfos(ctx context.Context, req *QueryDeviceInfosRequest, res *QueryDeviceInfosResponse) error
+}
+
 type UserDirectoryProvider interface {
 	QuerySearchProfiles(ctx context.Context, req *QuerySearchProfilesRequest, res *QuerySearchProfilesResponse) error
 }