Consume key change events in fedsender

Don't yet send them to destinations as we haven't worked them out yet

federationapi/routing/devices.go

@@ -13,10 +13,11 @@
 package routing
 
 import (
+	"encoding/json"
 	"net/http"
 
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
-	userapi "github.com/matrix-org/dendrite/userapi/api"
+	keyapi "github.com/matrix-org/dendrite/keyserver/api"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
 )
@@ -24,30 +25,35 @@ import (
 // GetUserDevices for the given user id
 func GetUserDevices(
 	req *http.Request,
-	userAPI userapi.UserInternalAPI,
+	keyAPI keyapi.KeyInternalAPI,
 	userID string,
 ) util.JSONResponse {
-	response := gomatrixserverlib.RespUserDevices{
-		UserID: userID,
-		// TODO: we should return an incrementing stream ID each time the device
-		// list changes for delta changes to be recognised
-		StreamID: 0,
-	}
-
-	var res userapi.QueryDevicesResponse
-	err := userAPI.QueryDevices(req.Context(), &userapi.QueryDevicesRequest{
+	var res keyapi.QueryDeviceMessagesResponse
+	keyAPI.QueryDeviceMessages(req.Context(), &keyapi.QueryDeviceMessagesRequest{
 		UserID: userID,
 	}, &res)
-	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("userAPI.QueryDevices failed")
+	if res.Error != nil {
+		util.GetLogger(req.Context()).WithError(res.Error).Error("keyAPI.QueryDeviceMessages failed")
 		return jsonerror.InternalServerError()
 	}
 
+	response := gomatrixserverlib.RespUserDevices{
+		UserID:   userID,
+		StreamID: res.StreamID,
+	}
+
 	for _, dev := range res.Devices {
+		var key gomatrixserverlib.RespUserDeviceKeys
+		err := json.Unmarshal(dev.DeviceKeys.KeyJSON, &key)
+		if err != nil {
+			util.GetLogger(req.Context()).WithError(err).Warnf("malformed device key: %s", string(dev.DeviceKeys.KeyJSON))
+			continue
+		}
+
 		device := gomatrixserverlib.RespUserDevice{
-			DeviceID:    dev.ID,
+			DeviceID:    dev.DeviceID,
 			DisplayName: dev.DisplayName,
-			Keys:        []gomatrixserverlib.RespUserDeviceKeys{},
+			Keys:        []gomatrixserverlib.RespUserDeviceKeys{key},
 		}
 		response.Devices = append(response.Devices, device)
 	}

federationapi/routing/routing.go

@@ -186,7 +186,7 @@ func Setup(
 		"federation_user_devices", cfg.Matrix.ServerName, keys, wakeup,
 		func(httpReq *http.Request, request *gomatrixserverlib.FederationRequest, vars map[string]string) util.JSONResponse {
 			return GetUserDevices(
-				httpReq, userAPI, vars["userID"],
+				httpReq, keyAPI, vars["userID"],
 			)
 		},
 	)).Methods(http.MethodGet)

federationsender/consumers/keychange.go

@@ -0,0 +1,116 @@
+// 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 (
+	"encoding/json"
+	"fmt"
+
+	"github.com/Shopify/sarama"
+	"github.com/matrix-org/dendrite/federationsender/queue"
+	"github.com/matrix-org/dendrite/federationsender/storage"
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/internal/config"
+	"github.com/matrix-org/dendrite/keyserver/api"
+	"github.com/matrix-org/gomatrixserverlib"
+	log "github.com/sirupsen/logrus"
+)
+
+// KeyChangeConsumer consumes events that originate in key server.
+type KeyChangeConsumer struct {
+	consumer   *internal.ContinualConsumer
+	db         storage.Database
+	queues     *queue.OutgoingQueues
+	serverName gomatrixserverlib.ServerName
+}
+
+// NewKeyChangeConsumer creates a new KeyChangeConsumer. Call Start() to begin consuming from key servers.
+func NewKeyChangeConsumer(
+	cfg *config.Dendrite,
+	kafkaConsumer sarama.Consumer,
+	queues *queue.OutgoingQueues,
+	store storage.Database,
+) *KeyChangeConsumer {
+	c := &KeyChangeConsumer{
+		consumer: &internal.ContinualConsumer{
+			Topic:          string(cfg.Kafka.Topics.OutputKeyChangeEvent),
+			Consumer:       kafkaConsumer,
+			PartitionStore: store,
+		},
+		queues:     queues,
+		db:         store,
+		serverName: cfg.Matrix.ServerName,
+	}
+	c.consumer.ProcessMessage = c.onMessage
+
+	return c
+}
+
+// Start consuming from key servers
+func (t *KeyChangeConsumer) Start() error {
+	if err := t.consumer.Start(); err != nil {
+		return fmt.Errorf("t.consumer.Start: %w", err)
+	}
+	return nil
+}
+
+// onMessage is called in response to a message received on the
+// key change events topic from the key server.
+func (t *KeyChangeConsumer) onMessage(msg *sarama.ConsumerMessage) error {
+	var m api.DeviceMessage
+	if err := json.Unmarshal(msg.Value, &m); err != nil {
+		log.WithError(err).Errorf("failed to read device message from key change topic")
+		return nil
+	}
+
+	// only send key change events which originated from us
+	_, originServerName, err := gomatrixserverlib.SplitID('@', m.UserID)
+	if err != nil {
+		log.WithError(err).WithField("user_id", m.UserID).Error("Failed to extract domain from key change event")
+		return nil
+	}
+	if originServerName != t.serverName {
+		return nil
+	}
+
+	// TODO: send this key change to all users who share rooms with this user.
+	var destinations []gomatrixserverlib.ServerName
+
+	// Pack the EDU and marshal it
+	edu := &gomatrixserverlib.EDU{
+		Type:   gomatrixserverlib.MDeviceListUpdate,
+		Origin: string(t.serverName),
+	}
+	event := gomatrixserverlib.DeviceListUpdateEvent{
+		UserID:            m.UserID,
+		DeviceID:          m.DeviceID,
+		DeviceDisplayName: m.DisplayName,
+		StreamID:          m.StreamID,
+		PrevID:            prevID(m.StreamID),
+		Deleted:           len(m.KeyJSON) == 0,
+		Keys:              m.KeyJSON,
+	}
+	if edu.Content, err = json.Marshal(event); err != nil {
+		return err
+	}
+
+	log.Infof("Sending device list update message to %q", destinations)
+	return t.queues.SendEDU(edu, t.serverName, destinations)
+}
+
+func prevID(streamID int) []int {
+	if streamID <= 1 {
+		return nil
+	}
+	return []int{streamID - 1}
+}

go.mod

@@ -21,7 +21,7 @@ require (
 	github.com/matrix-org/go-http-js-libp2p v0.0.0-20200518170932-783164aeeda4
 	github.com/matrix-org/go-sqlite3-js v0.0.0-20200522092705-bc8506ccbcf3
 	github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26
-	github.com/matrix-org/gomatrixserverlib v0.0.0-20200722124340-16fba816840d
+	github.com/matrix-org/gomatrixserverlib v0.0.0-20200803165739-3bd1ef0f0852
 	github.com/matrix-org/naffka v0.0.0-20200422140631-181f1ee7401f
 	github.com/matrix-org/util v0.0.0-20190711121626-527ce5ddefc7
 	github.com/mattn/go-sqlite3 v2.0.2+incompatible

go.sum

@@ -425,6 +425,10 @@ github.com/matrix-org/gomatrixserverlib v0.0.0-20200721145051-cea6eafced2b h1:ul
 github.com/matrix-org/gomatrixserverlib v0.0.0-20200721145051-cea6eafced2b/go.mod h1:JsAzE1Ll3+gDWS9JSUHPJiiyAksvOOnGWF2nXdg4ZzU=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20200722124340-16fba816840d h1:WZXyd8YI+PQIDYjN8HxtqNRJ1DCckt9wPTi2P8cdnKM=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20200722124340-16fba816840d/go.mod h1:JsAzE1Ll3+gDWS9JSUHPJiiyAksvOOnGWF2nXdg4ZzU=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20200803165250-352235625587 h1:n2IZkm5LI4lACulOa5WU6QwWUhHUtBZez7YIFr1fCOs=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20200803165250-352235625587/go.mod h1:JsAzE1Ll3+gDWS9JSUHPJiiyAksvOOnGWF2nXdg4ZzU=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20200803165739-3bd1ef0f0852 h1:OBvHjLWaT2KS9kGarX2ES0yKBL/wMxAeQB39tRrAAls=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20200803165739-3bd1ef0f0852/go.mod h1:JsAzE1Ll3+gDWS9JSUHPJiiyAksvOOnGWF2nXdg4ZzU=
 github.com/matrix-org/naffka v0.0.0-20200422140631-181f1ee7401f h1:pRz4VTiRCO4zPlEMc3ESdUOcW4PXHH4Kj+YDz1XyE+Y=
 github.com/matrix-org/naffka v0.0.0-20200422140631-181f1ee7401f/go.mod h1:y0oDTjZDv5SM9a2rp3bl+CU+bvTRINQsdb7YlDql5Go=
 github.com/matrix-org/util v0.0.0-20190711121626-527ce5ddefc7 h1:ntrLa/8xVzeSs8vHFHK25k0C+NV74sYMJnNSg5NoSRo=