104 lines
3 KiB
Go
104 lines
3 KiB
Go
// Copyright 2017 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package routing
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import (
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"context"
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"encoding/json"
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"net/http"
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"time"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/gomatrixserverlib/fclient"
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"github.com/matrix-org/gomatrixserverlib/spec"
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"github.com/matrix-org/util"
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)
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// GetEvent returns the requested event
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func GetEvent(
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ctx context.Context,
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request *fclient.FederationRequest,
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rsAPI api.FederationRoomserverAPI,
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eventID string,
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origin spec.ServerName,
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) util.JSONResponse {
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// /_matrix/federation/v1/event/{eventId} doesn't have a roomID, we use an empty string,
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// which results in `QueryEventsByID` to first get the event and use that to determine the roomID.
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event, err := fetchEvent(ctx, rsAPI, "", eventID)
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if err != nil {
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return *err
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}
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err = allowedToSeeEvent(ctx, request.Origin(), rsAPI, eventID, event.RoomID().String())
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if err != nil {
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return *err
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}
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return util.JSONResponse{Code: http.StatusOK, JSON: gomatrixserverlib.Transaction{
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Origin: origin,
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OriginServerTS: spec.AsTimestamp(time.Now()),
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PDUs: []json.RawMessage{
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event.JSON(),
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},
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}}
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}
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// allowedToSeeEvent returns no error if the server is allowed to see this event,
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// otherwise it returns an error response which can be sent to the client.
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func allowedToSeeEvent(
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ctx context.Context,
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origin spec.ServerName,
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rsAPI api.FederationRoomserverAPI,
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eventID string,
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roomID string,
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) *util.JSONResponse {
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allowed, err := rsAPI.QueryServerAllowedToSeeEvent(ctx, origin, eventID, roomID)
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if err != nil {
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resErr := util.ErrorResponse(err)
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return &resErr
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}
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if !allowed {
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resErr := util.MessageResponse(http.StatusForbidden, "server not allowed to see event")
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return &resErr
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}
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return nil
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}
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// fetchEvent fetches the event without auth checks. Returns an error if the event cannot be found.
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func fetchEvent(ctx context.Context, rsAPI api.FederationRoomserverAPI, roomID, eventID string) (gomatrixserverlib.PDU, *util.JSONResponse) {
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var eventsResponse api.QueryEventsByIDResponse
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err := rsAPI.QueryEventsByID(
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ctx,
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&api.QueryEventsByIDRequest{EventIDs: []string{eventID}, RoomID: roomID},
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&eventsResponse,
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)
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if err != nil {
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resErr := util.ErrorResponse(err)
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return nil, &resErr
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}
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if len(eventsResponse.Events) == 0 {
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return nil, &util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: spec.NotFound("Event not found"),
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}
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}
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return eventsResponse.Events[0].PDU, nil
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}
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