259 lines
9.4 KiB
Go
259 lines
9.4 KiB
Go
// Copyright 2020 The Matrix.org Foundation C.I.C.
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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 perform
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import (
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"context"
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"fmt"
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federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/roomserver/internal/helpers"
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"github.com/matrix-org/dendrite/roomserver/internal/input"
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"github.com/matrix-org/dendrite/roomserver/state"
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"github.com/matrix-org/dendrite/roomserver/storage"
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"github.com/matrix-org/dendrite/roomserver/types"
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"github.com/matrix-org/dendrite/setup/config"
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"github.com/matrix-org/gomatrixserverlib"
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log "github.com/sirupsen/logrus"
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)
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type Inviter struct {
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DB storage.Database
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Cfg *config.RoomServer
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FSAPI federationSenderAPI.FederationSenderInternalAPI
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Inputer *input.Inputer
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}
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// nolint:gocyclo
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func (r *Inviter) PerformInvite(
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ctx context.Context,
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req *api.PerformInviteRequest,
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res *api.PerformInviteResponse,
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) ([]api.OutputEvent, error) {
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event := req.Event
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if event.StateKey() == nil {
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return nil, fmt.Errorf("invite must be a state event")
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}
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roomID := event.RoomID()
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targetUserID := *event.StateKey()
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info, err := r.DB.RoomInfo(ctx, roomID)
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if err != nil {
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return nil, fmt.Errorf("Failed to load RoomInfo: %w", err)
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}
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log.WithFields(log.Fields{
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"event_id": event.EventID(),
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"room_id": roomID,
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"room_version": req.RoomVersion,
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"target_user_id": targetUserID,
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"room_info_exists": info != nil,
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}).Info("processing invite event")
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_, domain, _ := gomatrixserverlib.SplitID('@', targetUserID)
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isTargetLocal := domain == r.Cfg.Matrix.ServerName
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isOriginLocal := event.Origin() == r.Cfg.Matrix.ServerName
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inviteState := req.InviteRoomState
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if len(inviteState) == 0 && info != nil {
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var is []gomatrixserverlib.InviteV2StrippedState
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if is, err = buildInviteStrippedState(ctx, r.DB, info, req); err == nil {
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inviteState = is
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}
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}
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if len(inviteState) == 0 {
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if err = event.SetUnsignedField("invite_room_state", struct{}{}); err != nil {
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return nil, fmt.Errorf("event.SetUnsignedField: %w", err)
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}
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} else {
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if err = event.SetUnsignedField("invite_room_state", inviteState); err != nil {
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return nil, fmt.Errorf("event.SetUnsignedField: %w", err)
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}
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}
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var isAlreadyJoined bool
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if info != nil {
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_, isAlreadyJoined, _, err = r.DB.GetMembership(ctx, info.RoomNID, *event.StateKey())
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if err != nil {
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return nil, fmt.Errorf("r.DB.GetMembership: %w", err)
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}
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}
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if isAlreadyJoined {
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// If the user is joined to the room then that takes precedence over this
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// invite event. It makes little sense to move a user that is already
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// joined to the room into the invite state.
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// This could plausibly happen if an invite request raced with a join
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// request for a user. For example if a user was invited to a public
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// room and they joined the room at the same time as the invite was sent.
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// The other way this could plausibly happen is if an invite raced with
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// a kick. For example if a user was kicked from a room in error and in
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// response someone else in the room re-invited them then it is possible
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// for the invite request to race with the leave event so that the
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// target receives invite before it learns that it has been kicked.
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// There are a few ways this could be plausibly handled in the roomserver.
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// 1) Store the invite, but mark it as retired. That will result in the
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// permanent rejection of that invite event. So even if the target
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// user leaves the room and the invite is retransmitted it will be
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// ignored. However a new invite with a new event ID would still be
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// accepted.
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// 2) Silently discard the invite event. This means that if the event
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// was retransmitted at a later date after the target user had left
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// the room we would accept the invite. However since we hadn't told
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// the sending server that the invite had been discarded it would
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// have no reason to attempt to retry.
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// 3) Signal the sending server that the user is already joined to the
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// room.
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// For now we will implement option 2. Since in the abesence of a retry
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// mechanism it will be equivalent to option 1, and we don't have a
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// signalling mechanism to implement option 3.
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res.Error = &api.PerformError{
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Code: api.PerformErrorNotAllowed,
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Msg: "User is already joined to room",
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}
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return nil, nil
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}
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if isOriginLocal {
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// The invite originated locally. Therefore we have a responsibility to
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// try and see if the user is allowed to make this invite. We can't do
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// this for invites coming in over federation - we have to take those on
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// trust.
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_, err = helpers.CheckAuthEvents(ctx, r.DB, event, event.AuthEventIDs())
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if err != nil {
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log.WithError(err).WithField("event_id", event.EventID()).WithField("auth_event_ids", event.AuthEventIDs()).Error(
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"processInviteEvent.checkAuthEvents failed for event",
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)
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res.Error = &api.PerformError{
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Msg: err.Error(),
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Code: api.PerformErrorNotAllowed,
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}
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}
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// If the invite originated from us and the target isn't local then we
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// should try and send the invite over federation first. It might be
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// that the remote user doesn't exist, in which case we can give up
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// processing here.
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if req.SendAsServer != api.DoNotSendToOtherServers && !isTargetLocal {
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fsReq := &federationSenderAPI.PerformInviteRequest{
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RoomVersion: req.RoomVersion,
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Event: event,
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InviteRoomState: inviteState,
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}
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fsRes := &federationSenderAPI.PerformInviteResponse{}
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if err = r.FSAPI.PerformInvite(ctx, fsReq, fsRes); err != nil {
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res.Error = &api.PerformError{
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Msg: err.Error(),
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Code: api.PerformErrorNotAllowed,
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}
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log.WithError(err).WithField("event_id", event.EventID()).Error("r.FSAPI.PerformInvite failed")
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return nil, nil
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}
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event = fsRes.Event
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}
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// Send the invite event to the roomserver input stream. This will
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// notify existing users in the room about the invite, update the
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// membership table and ensure that the event is ready and available
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// to use as an auth event when accepting the invite.
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inputReq := &api.InputRoomEventsRequest{
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InputRoomEvents: []api.InputRoomEvent{
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{
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Kind: api.KindNew,
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Event: event,
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AuthEventIDs: event.AuthEventIDs(),
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SendAsServer: req.SendAsServer,
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},
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},
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}
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inputRes := &api.InputRoomEventsResponse{}
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r.Inputer.InputRoomEvents(context.Background(), inputReq, inputRes)
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if err = inputRes.Err(); err != nil {
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res.Error = &api.PerformError{
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Msg: fmt.Sprintf("r.InputRoomEvents: %s", err.Error()),
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Code: api.PerformErrorNotAllowed,
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}
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log.WithError(err).WithField("event_id", event.EventID()).Error("r.InputRoomEvents failed")
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return nil, nil
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}
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} else {
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// The invite originated over federation. Process the membership
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// update, which will notify the sync API etc about the incoming
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// invite.
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updater, err := r.DB.MembershipUpdater(ctx, roomID, targetUserID, isTargetLocal, req.RoomVersion)
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if err != nil {
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return nil, fmt.Errorf("r.DB.MembershipUpdater: %w", err)
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}
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unwrapped := event.Unwrap()
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outputUpdates, err := helpers.UpdateToInviteMembership(updater, unwrapped, nil, req.Event.RoomVersion)
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if err != nil {
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return nil, fmt.Errorf("updateToInviteMembership: %w", err)
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}
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if err = updater.Commit(); err != nil {
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return nil, fmt.Errorf("updater.Commit: %w", err)
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}
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return outputUpdates, nil
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}
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return nil, nil
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}
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func buildInviteStrippedState(
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ctx context.Context,
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db storage.Database,
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info *types.RoomInfo,
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input *api.PerformInviteRequest,
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) ([]gomatrixserverlib.InviteV2StrippedState, error) {
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stateWanted := []gomatrixserverlib.StateKeyTuple{}
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// "If they are set on the room, at least the state for m.room.avatar, m.room.canonical_alias, m.room.join_rules, and m.room.name SHOULD be included."
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// https://matrix.org/docs/spec/client_server/r0.6.0#m-room-member
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for _, t := range []string{
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gomatrixserverlib.MRoomName, gomatrixserverlib.MRoomCanonicalAlias,
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gomatrixserverlib.MRoomAliases, gomatrixserverlib.MRoomJoinRules,
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"m.room.avatar", "m.room.encryption", gomatrixserverlib.MRoomCreate,
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} {
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stateWanted = append(stateWanted, gomatrixserverlib.StateKeyTuple{
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EventType: t,
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StateKey: "",
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})
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}
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roomState := state.NewStateResolution(db, *info)
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stateEntries, err := roomState.LoadStateAtSnapshotForStringTuples(
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ctx, info.StateSnapshotNID, stateWanted,
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)
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if err != nil {
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return nil, err
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}
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stateNIDs := []types.EventNID{}
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for _, stateNID := range stateEntries {
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stateNIDs = append(stateNIDs, stateNID.EventNID)
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}
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stateEvents, err := db.Events(ctx, stateNIDs)
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if err != nil {
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return nil, err
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}
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inviteState := []gomatrixserverlib.InviteV2StrippedState{
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gomatrixserverlib.NewInviteV2StrippedState(input.Event.Event),
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}
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stateEvents = append(stateEvents, types.Event{Event: input.Event.Unwrap()})
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for _, event := range stateEvents {
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inviteState = append(inviteState, gomatrixserverlib.NewInviteV2StrippedState(event.Event))
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}
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return inviteState, nil
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}
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