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// Copyright 2024 New Vector Ltd.
// Copyright 2022 The Matrix.org Foundation C.I.C.
//
// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
// Please see LICENSE files in the repository root for full details.
package routing
import (
"encoding/json"
"net/http"
"github.com/element-hq/dendrite/relayapi/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/gomatrixserverlib/fclient"
"github.com/matrix-org/gomatrixserverlib/spec"
"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 *fclient.FederationRequest,
relayAPI api.RelayInternalAPI,
txnID gomatrixserverlib.TransactionID,
userID spec.UserID,
) util.JSONResponse {
logrus.Infof("Processing send_relay for %s", userID.String())
var txnEvents fclient.RelayEvents
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: spec.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: spec.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: spec.BadJSON("could not store the transaction for forwarding"),
}
}
return util.JSONResponse{Code: 200}
}
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