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