Generic-based internal HTTP API (#2626)

* Generic-based internal HTTP API (tested out on a few endpoints in the federation API)

* Add `PerformInvite`

* More tweaks

* Fix metric name

* Fix LookupStateIDs

* Lots of changes to clients

* Some serverside stuff

* Some error handling

* Use paths as metric names

* Revert "Use paths as metric names"

This reverts commit a9323a6a343f5ce6461a2e5bd570fe06465f1b15.

* Namespace metric names

* Remove duplicate entry

* Remove another duplicate entry

* Tweak error handling

* Some more tweaks

* Update error behaviour

* Some more error tweaking

* Fix API path for `PerformDeleteKeys`

* Fix another path

* Tweak federation client proxying

* Fix another path

* Don't return typed nils

* Some more tweaks, not that it makes any difference

* Tweak federation client proxying

* Maybe fix the key backup test

6 files changed, 30 insertions, 15 deletions

diff --git a/federationapi/routing/devices.go b/federationapi/routing/devices.go
index 2f9da1f2..ce8b06b7 100644
--- a/federationapi/routing/devices.go
+++ b/federationapi/routing/devices.go
@@ -30,9 +30,11 @@ func GetUserDevices(
 	userID string,
 ) util.JSONResponse {
 	var res keyapi.QueryDeviceMessagesResponse
-	keyAPI.QueryDeviceMessages(req.Context(), &keyapi.QueryDeviceMessagesRequest{
+	if err := keyAPI.QueryDeviceMessages(req.Context(), &keyapi.QueryDeviceMessagesRequest{
 		UserID: userID,
-	}, &res)
+	}, &res); err != nil {
+		return util.ErrorResponse(err)
+	}
 	if res.Error != nil {
 		util.GetLogger(req.Context()).WithError(res.Error).Error("keyAPI.QueryDeviceMessages failed")
 		return jsonerror.InternalServerError()
@@ -47,7 +49,9 @@ func GetUserDevices(
 	for _, dev := range res.Devices {
 		sigReq.TargetIDs[userID] = append(sigReq.TargetIDs[userID], gomatrixserverlib.KeyID(dev.DeviceID))
 	}
-	keyAPI.QuerySignatures(req.Context(), sigReq, sigRes)
+	if err := keyAPI.QuerySignatures(req.Context(), sigReq, sigRes); err != nil {
+		return jsonerror.InternalAPIError(req.Context(), err)
+	}
 
 	response := gomatrixserverlib.RespUserDevices{
 		UserID:   userID,
diff --git a/federationapi/routing/join.go b/federationapi/routing/join.go
index 9ad3bd8e..b48eaf78 100644
--- a/federationapi/routing/join.go
+++ b/federationapi/routing/join.go
@@ -392,7 +392,7 @@ func SendJoin(
 	// the room, so set SendAsServer to cfg.Matrix.ServerName
 	if !alreadyJoined {
 		var response api.InputRoomEventsResponse
-		rsAPI.InputRoomEvents(httpReq.Context(), &api.InputRoomEventsRequest{
+		if err := rsAPI.InputRoomEvents(httpReq.Context(), &api.InputRoomEventsRequest{
 			InputRoomEvents: []api.InputRoomEvent{
 				{
 					Kind:          api.KindNew,
@@ -401,7 +401,9 @@ func SendJoin(
 					TransactionID: nil,
 				},
 			},
-		}, &response)
+		}, &response); err != nil {
+			return jsonerror.InternalAPIError(httpReq.Context(), err)
+		}
 		if response.ErrMsg != "" {
 			util.GetLogger(httpReq.Context()).WithField(logrus.ErrorKey, response.ErrMsg).Error("SendEvents failed")
 			if response.NotAllowed {
diff --git a/federationapi/routing/keys.go b/federationapi/routing/keys.go
index b1a9b671..b03d4c1d 100644
--- a/federationapi/routing/keys.go
+++ b/federationapi/routing/keys.go
@@ -19,7 +19,7 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/matrix-org/dendrite/clientapi/httputil"
+	clienthttputil "github.com/matrix-org/dendrite/clientapi/httputil"
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
 	federationAPI "github.com/matrix-org/dendrite/federationapi/api"
 	"github.com/matrix-org/dendrite/keyserver/api"
@@ -61,9 +61,11 @@ func QueryDeviceKeys(
 	}
 
 	var queryRes api.QueryKeysResponse
-	keyAPI.QueryKeys(httpReq.Context(), &api.QueryKeysRequest{
+	if err := keyAPI.QueryKeys(httpReq.Context(), &api.QueryKeysRequest{
 		UserToDevices: qkr.DeviceKeys,
-	}, &queryRes)
+	}, &queryRes); err != nil {
+		return jsonerror.InternalAPIError(httpReq.Context(), err)
+	}
 	if queryRes.Error != nil {
 		util.GetLogger(httpReq.Context()).WithError(queryRes.Error).Error("Failed to QueryKeys")
 		return jsonerror.InternalServerError()
@@ -113,9 +115,11 @@ func ClaimOneTimeKeys(
 	}
 
 	var claimRes api.PerformClaimKeysResponse
-	keyAPI.PerformClaimKeys(httpReq.Context(), &api.PerformClaimKeysRequest{
+	if err := keyAPI.PerformClaimKeys(httpReq.Context(), &api.PerformClaimKeysRequest{
 		OneTimeKeys: cor.OneTimeKeys,
-	}, &claimRes)
+	}, &claimRes); err != nil {
+		return jsonerror.InternalAPIError(httpReq.Context(), err)
+	}
 	if claimRes.Error != nil {
 		util.GetLogger(httpReq.Context()).WithError(claimRes.Error).Error("Failed to PerformClaimKeys")
 		return jsonerror.InternalServerError()
@@ -184,7 +188,7 @@ func NotaryKeys(
 ) util.JSONResponse {
 	if req == nil {
 		req = &gomatrixserverlib.PublicKeyNotaryLookupRequest{}
-		if reqErr := httputil.UnmarshalJSONRequest(httpReq, &req); reqErr != nil {
+		if reqErr := clienthttputil.UnmarshalJSONRequest(httpReq, &req); reqErr != nil {
 			return *reqErr
 		}
 	}
diff --git a/federationapi/routing/leave.go b/federationapi/routing/leave.go
index dbaf68e5..8e43ce95 100644
--- a/federationapi/routing/leave.go
+++ b/federationapi/routing/leave.go
@@ -277,7 +277,7 @@ func SendLeave(
 	// We are responsible for notifying other servers that the user has left
 	// the room, so set SendAsServer to cfg.Matrix.ServerName
 	var response api.InputRoomEventsResponse
-	rsAPI.InputRoomEvents(httpReq.Context(), &api.InputRoomEventsRequest{
+	if err := rsAPI.InputRoomEvents(httpReq.Context(), &api.InputRoomEventsRequest{
 		InputRoomEvents: []api.InputRoomEvent{
 			{
 				Kind:          api.KindNew,
@@ -286,7 +286,9 @@ func SendLeave(
 				TransactionID: nil,
 			},
 		},
-	}, &response)
+	}, &response); err != nil {
+		return jsonerror.InternalAPIError(httpReq.Context(), err)
+	}
 
 	if response.ErrMsg != "" {
 		util.GetLogger(httpReq.Context()).WithField(logrus.ErrorKey, response.ErrMsg).WithField("not_allowed", response.NotAllowed).Error("producer.SendEvents failed")
diff --git a/federationapi/routing/send.go b/federationapi/routing/send.go
index 43003be3..87b6fa33 100644
--- a/federationapi/routing/send.go
+++ b/federationapi/routing/send.go
@@ -458,7 +458,9 @@ func (t *txnReq) processSigningKeyUpdate(ctx context.Context, e gomatrixserverli
 		UserID:           updatePayload.UserID,
 	}
 	uploadRes := &keyapi.PerformUploadDeviceKeysResponse{}
-	t.keyAPI.PerformUploadDeviceKeys(ctx, uploadReq, uploadRes)
+	if err := t.keyAPI.PerformUploadDeviceKeys(ctx, uploadReq, uploadRes); err != nil {
+		return err
+	}
 	if uploadRes.Error != nil {
 		return uploadRes.Error
 	}
diff --git a/federationapi/routing/send_test.go b/federationapi/routing/send_test.go
index a111580c..1c796f54 100644
--- a/federationapi/routing/send_test.go
+++ b/federationapi/routing/send_test.go
@@ -64,11 +64,12 @@ func (t *testRoomserverAPI) InputRoomEvents(
 	ctx context.Context,
 	request *api.InputRoomEventsRequest,
 	response *api.InputRoomEventsResponse,
-) {
+) error {
 	t.inputRoomEvents = append(t.inputRoomEvents, request.InputRoomEvents...)
 	for _, ire := range request.InputRoomEvents {
 		fmt.Println("InputRoomEvents: ", ire.Event.EventID())
 	}
+	return nil
 }
 
 // Query the latest events and state for a room from the room server.