Cross-signing fixes, notifications via sync, federation (#1974)

* Initial work on signing key update EDUs

* Fix build

* Produce/consume EDUs

* Producer logging

* Only produce key change notifications for local users

* Better naming

* Try to notify sync

* Enable feature

* Use key change topic

* Don't bother verifying signatures, validate key lengths if we can, notifier fixes

* Copyright notices

* Remove tests from whitelist until matrix-org/sytest#1117

* Some review comment fixes

* Update to matrix-org/gomatrixserverlib@f9416ac

* Remove unneeded parameter

eduserver/api/input.go

@@ -75,6 +75,12 @@ type InputReceiptEventRequest struct {
 // InputReceiptEventResponse is a response to InputReceiptEventRequest
 type InputReceiptEventResponse struct{}
 
+type InputCrossSigningKeyUpdateRequest struct {
+	CrossSigningKeyUpdate `json:"signing_keys"`
+}
+
+type InputCrossSigningKeyUpdateResponse struct{}
+
 // EDUServerInputAPI is used to write events to the typing server.
 type EDUServerInputAPI interface {
 	InputTypingEvent(
@@ -94,4 +100,10 @@ type EDUServerInputAPI interface {
 		request *InputReceiptEventRequest,
 		response *InputReceiptEventResponse,
 	) error
+
+	InputCrossSigningKeyUpdate(
+		ctx context.Context,
+		request *InputCrossSigningKeyUpdateRequest,
+		response *InputCrossSigningKeyUpdateResponse,
+	) error
 }

eduserver/api/output.go

@@ -33,14 +33,6 @@ type OutputTypingEvent struct {
 	ExpireTime *time.Time
 }
 
-// TypingEvent represents a matrix edu event of type 'm.typing'.
-type TypingEvent struct {
-	Type   string `json:"type"`
-	RoomID string `json:"room_id"`
-	UserID string `json:"user_id"`
-	Typing bool   `json:"typing"`
-}
-
 // OutputSendToDeviceEvent is an entry in the send-to-device output kafka log.
 // This contains the full event content, along with the user ID and device ID
 // to which it is destined.
@@ -50,14 +42,6 @@ type OutputSendToDeviceEvent struct {
 	gomatrixserverlib.SendToDeviceEvent
 }
 
-type ReceiptEvent struct {
-	UserID    string                      `json:"user_id"`
-	RoomID    string                      `json:"room_id"`
-	EventID   string                      `json:"event_id"`
-	Type      string                      `json:"type"`
-	Timestamp gomatrixserverlib.Timestamp `json:"timestamp"`
-}
-
 // OutputReceiptEvent is an entry in the receipt output kafka log
 type OutputReceiptEvent struct {
 	UserID    string                      `json:"user_id"`
@@ -67,21 +51,7 @@ type OutputReceiptEvent struct {
 	Timestamp gomatrixserverlib.Timestamp `json:"timestamp"`
 }
 
-// Helper structs for receipts json creation
-type ReceiptMRead struct {
-	User map[string]ReceiptTS `json:"m.read"`
-}
-
-type ReceiptTS struct {
-	TS gomatrixserverlib.Timestamp `json:"ts"`
-}
-
-// FederationSender output
-type FederationReceiptMRead struct {
-	User map[string]FederationReceiptData `json:"m.read"`
-}
-
-type FederationReceiptData struct {
-	Data     ReceiptTS `json:"data"`
-	EventIDs []string  `json:"event_ids"`
+// OutputCrossSigningKeyUpdate is an entry in the signing key update output kafka log
+type OutputCrossSigningKeyUpdate struct {
+	CrossSigningKeyUpdate `json:"signing_keys"`
 }

eduserver/api/types.go

@@ -0,0 +1,59 @@
+// Copyright 2021 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 api
+
+import "github.com/matrix-org/gomatrixserverlib"
+
+const (
+	MSigningKeyUpdate = "m.signing_key_update"
+)
+
+type TypingEvent struct {
+	Type   string `json:"type"`
+	RoomID string `json:"room_id"`
+	UserID string `json:"user_id"`
+	Typing bool   `json:"typing"`
+}
+
+type ReceiptEvent struct {
+	UserID    string                      `json:"user_id"`
+	RoomID    string                      `json:"room_id"`
+	EventID   string                      `json:"event_id"`
+	Type      string                      `json:"type"`
+	Timestamp gomatrixserverlib.Timestamp `json:"timestamp"`
+}
+
+type FederationReceiptMRead struct {
+	User map[string]FederationReceiptData `json:"m.read"`
+}
+
+type FederationReceiptData struct {
+	Data     ReceiptTS `json:"data"`
+	EventIDs []string  `json:"event_ids"`
+}
+
+type ReceiptMRead struct {
+	User map[string]ReceiptTS `json:"m.read"`
+}
+
+type ReceiptTS struct {
+	TS gomatrixserverlib.Timestamp `json:"ts"`
+}
+
+type CrossSigningKeyUpdate struct {
+	MasterKey      *gomatrixserverlib.CrossSigningKey `json:"master_key,omitempty"`
+	SelfSigningKey *gomatrixserverlib.CrossSigningKey `json:"self_signing_key,omitempty"`
+	UserID         string                             `json:"user_id"`
+}