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// Copyright 2022 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package routing
import (
"encoding/json"
"net/http"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/relayapi/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
"github.com/sirupsen/logrus"
)
// SendTransactionToRelay implements PUT /_matrix/federation/v1/send_relay/{txnID}/{userID}
// This endpoint can be extracted into a separate relay server service.
func SendTransactionToRelay(
httpReq *http.Request,
fedReq *gomatrixserverlib.FederationRequest,
relayAPI api.RelayInternalAPI,
txnID gomatrixserverlib.TransactionID,
userID gomatrixserverlib.UserID,
) util.JSONResponse {
logrus.Infof("Processing send_relay for %s", userID.Raw())
var txnEvents struct {
PDUs []json.RawMessage `json:"pdus"`
EDUs []gomatrixserverlib.EDU `json:"edus"`
}
if err := json.Unmarshal(fedReq.Content(), &txnEvents); err != nil {
logrus.Info("The request body could not be decoded into valid JSON." + err.Error())
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.NotJSON("The request body could not be decoded into valid JSON." + err.Error()),
}
}
// Transactions are limited in size; they can have at most 50 PDUs and 100 EDUs.
// https://matrix.org/docs/spec/server_server/latest#transactions
if len(txnEvents.PDUs) > 50 || len(txnEvents.EDUs) > 100 {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("max 50 pdus / 100 edus"),
}
}
t := gomatrixserverlib.Transaction{}
t.PDUs = txnEvents.PDUs
t.EDUs = txnEvents.EDUs
t.Origin = fedReq.Origin()
t.TransactionID = txnID
t.Destination = userID.Domain()
util.GetLogger(httpReq.Context()).Warnf("Received transaction %q from %q containing %d PDUs, %d EDUs", txnID, fedReq.Origin(), len(t.PDUs), len(t.EDUs))
err := relayAPI.PerformStoreTransaction(httpReq.Context(), t, userID)
if err != nil {
return util.JSONResponse{
Code: http.StatusInternalServerError,
JSON: jsonerror.BadJSON("could not store the transaction for forwarding"),
}
}
return util.JSONResponse{Code: 200}
}
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