use go module for dependencies (#594)

clientapi/routing/sendevent.go

@@ -0,0 +1,153 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// 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 (
+	"net/http"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/clientapi/httputil"
+	"github.com/matrix-org/dendrite/clientapi/jsonerror"
+	"github.com/matrix-org/dendrite/clientapi/producers"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/common/config"
+	"github.com/matrix-org/dendrite/common/transactions"
+	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/matrix-org/util"
+)
+
+// http://matrix.org/docs/spec/client_server/r0.2.0.html#put-matrix-client-r0-rooms-roomid-send-eventtype-txnid
+// http://matrix.org/docs/spec/client_server/r0.2.0.html#put-matrix-client-r0-rooms-roomid-state-eventtype-statekey
+type sendEventResponse struct {
+	EventID string `json:"event_id"`
+}
+
+// SendEvent implements:
+//   /rooms/{roomID}/send/{eventType}
+//   /rooms/{roomID}/send/{eventType}/{txnID}
+//   /rooms/{roomID}/state/{eventType}/{stateKey}
+func SendEvent(
+	req *http.Request,
+	device *authtypes.Device,
+	roomID, eventType string, txnID, stateKey *string,
+	cfg config.Dendrite,
+	queryAPI api.RoomserverQueryAPI,
+	producer *producers.RoomserverProducer,
+	txnCache *transactions.Cache,
+) util.JSONResponse {
+	if txnID != nil {
+		// Try to fetch response from transactionsCache
+		if res, ok := txnCache.FetchTransaction(*txnID); ok {
+			return *res
+		}
+	}
+
+	e, resErr := generateSendEvent(req, device, roomID, eventType, stateKey, cfg, queryAPI)
+	if resErr != nil {
+		return *resErr
+	}
+
+	var txnAndDeviceID *api.TransactionID
+	if txnID != nil {
+		txnAndDeviceID = &api.TransactionID{
+			TransactionID: *txnID,
+			DeviceID:      device.ID,
+		}
+	}
+
+	// pass the new event to the roomserver and receive the correct event ID
+	// event ID in case of duplicate transaction is discarded
+	eventID, err := producer.SendEvents(
+		req.Context(), []gomatrixserverlib.Event{*e}, cfg.Matrix.ServerName, txnAndDeviceID,
+	)
+	if err != nil {
+		return httputil.LogThenError(req, err)
+	}
+
+	res := util.JSONResponse{
+		Code: http.StatusOK,
+		JSON: sendEventResponse{eventID},
+	}
+	// Add response to transactionsCache
+	if txnID != nil {
+		txnCache.AddTransaction(*txnID, &res)
+	}
+
+	return res
+}
+
+func generateSendEvent(
+	req *http.Request,
+	device *authtypes.Device,
+	roomID, eventType string, stateKey *string,
+	cfg config.Dendrite,
+	queryAPI api.RoomserverQueryAPI,
+) (*gomatrixserverlib.Event, *util.JSONResponse) {
+	// parse the incoming http request
+	userID := device.UserID
+	var r map[string]interface{} // must be a JSON object
+	resErr := httputil.UnmarshalJSONRequest(req, &r)
+	if resErr != nil {
+		return nil, resErr
+	}
+
+	evTime, err := httputil.ParseTSParam(req)
+	if err != nil {
+		return nil, &util.JSONResponse{
+			Code: http.StatusBadRequest,
+			JSON: jsonerror.InvalidArgumentValue(err.Error()),
+		}
+	}
+
+	// create the new event and set all the fields we can
+	builder := gomatrixserverlib.EventBuilder{
+		Sender:   userID,
+		RoomID:   roomID,
+		Type:     eventType,
+		StateKey: stateKey,
+	}
+	err = builder.SetContent(r)
+	if err != nil {
+		resErr := httputil.LogThenError(req, err)
+		return nil, &resErr
+	}
+
+	var queryRes api.QueryLatestEventsAndStateResponse
+	e, err := common.BuildEvent(req.Context(), &builder, cfg, evTime, queryAPI, &queryRes)
+	if err == common.ErrRoomNoExists {
+		return nil, &util.JSONResponse{
+			Code: http.StatusNotFound,
+			JSON: jsonerror.NotFound("Room does not exist"),
+		}
+	} else if err != nil {
+		resErr := httputil.LogThenError(req, err)
+		return nil, &resErr
+	}
+
+	// check to see if this user can perform this operation
+	stateEvents := make([]*gomatrixserverlib.Event, len(queryRes.StateEvents))
+	for i := range queryRes.StateEvents {
+		stateEvents[i] = &queryRes.StateEvents[i]
+	}
+	provider := gomatrixserverlib.NewAuthEvents(stateEvents)
+	if err = gomatrixserverlib.Allowed(*e, &provider); err != nil {
+		return nil, &util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden(err.Error()), // TODO: Is this error string comprehensible to the client?
+		}
+	}
+	return e, nil
+}