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// Copyright 2022 The Matrix.org Foundation C.I.C.
//
// 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"
"strconv"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
"github.com/sirupsen/logrus"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/syncapi/internal"
"github.com/matrix-org/dendrite/syncapi/storage"
"github.com/matrix-org/dendrite/syncapi/synctypes"
"github.com/matrix-org/dendrite/syncapi/types"
userapi "github.com/matrix-org/dendrite/userapi/api"
)
type RelationsResponse struct {
Chunk []synctypes.ClientEvent `json:"chunk"`
NextBatch string `json:"next_batch,omitempty"`
PrevBatch string `json:"prev_batch,omitempty"`
}
// nolint:gocyclo
func Relations(
req *http.Request, device *userapi.Device,
syncDB storage.Database,
rsAPI api.SyncRoomserverAPI,
roomID, eventID, relType, eventType string,
) util.JSONResponse {
var err error
var from, to types.StreamPosition
var limit int
dir := req.URL.Query().Get("dir")
if f := req.URL.Query().Get("from"); f != "" {
if from, err = types.NewStreamPositionFromString(f); err != nil {
return util.ErrorResponse(err)
}
}
if t := req.URL.Query().Get("to"); t != "" {
if to, err = types.NewStreamPositionFromString(t); err != nil {
return util.ErrorResponse(err)
}
}
if l := req.URL.Query().Get("limit"); l != "" {
if limit, err = strconv.Atoi(l); err != nil {
return util.ErrorResponse(err)
}
}
if limit == 0 || limit > 50 {
limit = 50
}
if dir == "" {
dir = "b"
}
if dir != "b" && dir != "f" {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.MissingArgument("Bad or missing dir query parameter (should be either 'b' or 'f')"),
}
}
snapshot, err := syncDB.NewDatabaseSnapshot(req.Context())
if err != nil {
logrus.WithError(err).Error("Failed to get snapshot for relations")
return jsonerror.InternalServerError()
}
var succeeded bool
defer sqlutil.EndTransactionWithCheck(snapshot, &succeeded, &err)
res := &RelationsResponse{
Chunk: []synctypes.ClientEvent{},
}
var events []types.StreamEvent
events, res.PrevBatch, res.NextBatch, err = snapshot.RelationsFor(
req.Context(), roomID, eventID, relType, eventType, from, to, dir == "b", limit,
)
if err != nil {
return util.ErrorResponse(err)
}
headeredEvents := make([]*gomatrixserverlib.HeaderedEvent, 0, len(events))
for _, event := range events {
headeredEvents = append(headeredEvents, event.HeaderedEvent)
}
// Apply history visibility to the result events.
filteredEvents, err := internal.ApplyHistoryVisibilityFilter(req.Context(), snapshot, rsAPI, headeredEvents, nil, device.UserID, "relations")
if err != nil {
return util.ErrorResponse(err)
}
// Convert the events into client events, and optionally filter based on the event
// type if it was specified.
res.Chunk = make([]synctypes.ClientEvent, 0, len(filteredEvents))
for _, event := range filteredEvents {
res.Chunk = append(
res.Chunk,
synctypes.ToClientEvent(event.Event, synctypes.FormatAll),
)
}
succeeded = true
return util.JSONResponse{
Code: http.StatusOK,
JSON: res,
}
}
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