mirror of
https://github.com/matrix-org/dendrite
synced 2024-12-14 07:12:53 +00:00
105 lines
3.1 KiB
Go
105 lines
3.1 KiB
Go
// 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 common
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/matrix-org/dendrite/common/config"
|
|
"github.com/matrix-org/dendrite/roomserver/api"
|
|
|
|
"github.com/matrix-org/gomatrixserverlib"
|
|
"github.com/matrix-org/util"
|
|
)
|
|
|
|
// ErrRoomNoExists is returned when trying to lookup the state of a room that
|
|
// doesn't exist
|
|
var ErrRoomNoExists = errors.New("Room does not exist")
|
|
|
|
// BuildEvent builds a Matrix event using the event builder and roomserver query
|
|
// API client provided. If also fills roomserver query API response (if provided)
|
|
// in case the function calling FillBuilder needs to use it.
|
|
// Returns ErrRoomNoExists if the state of the room could not be retrieved because
|
|
// the room doesn't exist
|
|
// Returns an error if something else went wrong
|
|
func BuildEvent(
|
|
ctx context.Context,
|
|
builder *gomatrixserverlib.EventBuilder, cfg config.Dendrite, evTime time.Time,
|
|
queryAPI api.RoomserverQueryAPI, queryRes *api.QueryLatestEventsAndStateResponse,
|
|
) (*gomatrixserverlib.Event, error) {
|
|
err := AddPrevEventsToEvent(ctx, builder, queryAPI, queryRes)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
eventID := fmt.Sprintf("$%s:%s", util.RandomString(16), cfg.Matrix.ServerName)
|
|
event, err := builder.Build(eventID, evTime, cfg.Matrix.ServerName, cfg.Matrix.KeyID, cfg.Matrix.PrivateKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &event, nil
|
|
}
|
|
|
|
// AddPrevEventsToEvent fills out the prev_events and auth_events fields in builder
|
|
func AddPrevEventsToEvent(
|
|
ctx context.Context,
|
|
builder *gomatrixserverlib.EventBuilder,
|
|
queryAPI api.RoomserverQueryAPI, queryRes *api.QueryLatestEventsAndStateResponse,
|
|
) error {
|
|
eventsNeeded, err := gomatrixserverlib.StateNeededForEventBuilder(builder)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Ask the roomserver for information about this room
|
|
queryReq := api.QueryLatestEventsAndStateRequest{
|
|
RoomID: builder.RoomID,
|
|
StateToFetch: eventsNeeded.Tuples(),
|
|
}
|
|
if queryRes == nil {
|
|
queryRes = &api.QueryLatestEventsAndStateResponse{}
|
|
}
|
|
if err = queryAPI.QueryLatestEventsAndState(ctx, &queryReq, queryRes); err != nil {
|
|
return err
|
|
}
|
|
|
|
if !queryRes.RoomExists {
|
|
return ErrRoomNoExists
|
|
}
|
|
|
|
builder.Depth = queryRes.Depth
|
|
builder.PrevEvents = queryRes.LatestEvents
|
|
|
|
authEvents := gomatrixserverlib.NewAuthEvents(nil)
|
|
|
|
for i := range queryRes.StateEvents {
|
|
err = authEvents.AddEvent(&queryRes.StateEvents[i])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
refs, err := eventsNeeded.AuthEventReferences(&authEvents)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
builder.AuthEvents = refs
|
|
|
|
return nil
|
|
}
|