138 lines
4.1 KiB
Go
138 lines
4.1 KiB
Go
// Copyright 2018 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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"encoding/json"
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"fmt"
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"net/http"
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"strconv"
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"time"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/setup/config"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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)
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// Backfill implements the /backfill federation endpoint.
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// https://matrix.org/docs/spec/server_server/unstable.html#get-matrix-federation-v1-backfill-roomid
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func Backfill(
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httpReq *http.Request,
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request *gomatrixserverlib.FederationRequest,
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rsAPI api.FederationRoomserverAPI,
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roomID string,
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cfg *config.FederationAPI,
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) util.JSONResponse {
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var res api.PerformBackfillResponse
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var eIDs []string
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var limit string
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var exists bool
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var err error
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// Check the room ID's format.
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if _, _, err = gomatrixserverlib.SplitID('!', roomID); err != nil {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.MissingArgument("Bad room ID: " + err.Error()),
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}
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}
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// If we don't think we belong to this room then don't waste the effort
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// responding to expensive requests for it.
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if err := ErrorIfLocalServerNotInRoom(httpReq.Context(), rsAPI, roomID); err != nil {
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return *err
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}
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// Check if all of the required parameters are there.
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eIDs, exists = httpReq.URL.Query()["v"]
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if !exists {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.MissingArgument("v is missing"),
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}
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}
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limit = httpReq.URL.Query().Get("limit")
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if len(limit) == 0 {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.MissingArgument("limit is missing"),
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}
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}
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// Populate the request.
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req := api.PerformBackfillRequest{
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RoomID: roomID,
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// we don't know who the successors are for these events, which won't
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// be a problem because we don't use that information when servicing /backfill requests,
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// only when making them. TODO: Think of a better API shape
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BackwardsExtremities: map[string][]string{
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"": eIDs,
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},
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ServerName: request.Origin(),
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VirtualHost: request.Destination(),
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}
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if req.Limit, err = strconv.Atoi(limit); err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("strconv.Atoi failed")
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.InvalidArgumentValue(fmt.Sprintf("limit %q is invalid format", limit)),
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}
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}
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// Query the roomserver.
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if err = rsAPI.PerformBackfill(httpReq.Context(), &req, &res); err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("query.PerformBackfill failed")
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return jsonerror.InternalServerError()
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}
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// Filter any event that's not from the requested room out.
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evs := make([]*gomatrixserverlib.Event, 0)
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var ev *gomatrixserverlib.HeaderedEvent
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for _, ev = range res.Events {
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if ev.RoomID() == roomID {
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evs = append(evs, ev.Event)
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}
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}
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eventJSONs := []json.RawMessage{}
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for _, e := range gomatrixserverlib.ReverseTopologicalOrdering(
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evs,
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gomatrixserverlib.TopologicalOrderByPrevEvents,
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) {
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eventJSONs = append(eventJSONs, e.JSON())
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}
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// sytest wants these in reversed order, similar to /messages, so reverse them now.
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for i := len(eventJSONs)/2 - 1; i >= 0; i-- {
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opp := len(eventJSONs) - 1 - i
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eventJSONs[i], eventJSONs[opp] = eventJSONs[opp], eventJSONs[i]
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}
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txn := gomatrixserverlib.Transaction{
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Origin: request.Destination(),
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PDUs: eventJSONs,
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OriginServerTS: gomatrixserverlib.AsTimestamp(time.Now()),
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}
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// Send the events to the client.
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: txn,
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}
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}
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