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dendrite/roomserver/api/wrapper.go
Neil Alexander a06c18bb56
Soft-fail (#1364)
* Initial work on soft-fail

* Fix state block retrieval

* Copy-pasta QueryLatestEventsAndState code

* Fix state lookup

* Clean up

* Fix up failing sytest

* Linting

* Update previous events SQLite insert query

* Update SQLite InsertPreviousEvent properly

* Hopefully fix the event references updates

Co-authored-by: Kegan Dougal <kegan@matrix.org>
2020-09-21 14:55:46 +01:00

328 lines
11 KiB
Go

// Copyright 2020 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 api
import (
"context"
"fmt"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
)
// SendEvents to the roomserver The events are written with KindNew.
func SendEvents(
ctx context.Context, rsAPI RoomserverInternalAPI, events []gomatrixserverlib.HeaderedEvent,
sendAsServer gomatrixserverlib.ServerName, txnID *TransactionID,
) error {
ires := make([]InputRoomEvent, len(events))
for i, event := range events {
ires[i] = InputRoomEvent{
Kind: KindNew,
Event: event,
AuthEventIDs: event.AuthEventIDs(),
SendAsServer: string(sendAsServer),
TransactionID: txnID,
}
}
return SendInputRoomEvents(ctx, rsAPI, ires)
}
// SendEventWithState writes an event with KindNew to the roomserver
// with the state at the event as KindOutlier before it. Will not send any event that is
// marked as `true` in haveEventIDs
func SendEventWithState(
ctx context.Context, rsAPI RoomserverInternalAPI, state *gomatrixserverlib.RespState,
event gomatrixserverlib.HeaderedEvent, haveEventIDs map[string]bool,
) error {
outliers, err := state.Events()
if err != nil {
return err
}
var ires []InputRoomEvent
for _, outlier := range outliers {
if haveEventIDs[outlier.EventID()] {
continue
}
ires = append(ires, InputRoomEvent{
Kind: KindOutlier,
Event: outlier.Headered(event.RoomVersion),
AuthEventIDs: outlier.AuthEventIDs(),
})
}
stateEventIDs := make([]string, len(state.StateEvents))
for i := range state.StateEvents {
stateEventIDs[i] = state.StateEvents[i].EventID()
}
ires = append(ires, InputRoomEvent{
Kind: KindNew,
Event: event,
AuthEventIDs: event.AuthEventIDs(),
HasState: true,
StateEventIDs: stateEventIDs,
})
return SendInputRoomEvents(ctx, rsAPI, ires)
}
// SendEventWithRewrite writes an event with KindNew to the roomserver along
// with a number of rewrite and outlier events for state and auth events
// respectively.
func SendEventWithRewrite(
ctx context.Context, rsAPI RoomserverInternalAPI, state *gomatrixserverlib.RespState,
event gomatrixserverlib.HeaderedEvent, haveEventIDs map[string]bool,
) error {
isCurrentState := map[string]struct{}{}
for _, se := range state.StateEvents {
isCurrentState[se.EventID()] = struct{}{}
}
authAndStateEvents, err := state.Events()
if err != nil {
return err
}
var ires []InputRoomEvent
var stateIDs []string
// This function generates three things:
// A - A set of "rewrite" events, which will form the newly rewritten
// state before the event, which includes every rewrite event that
// came before it in its state
// B - A set of "outlier" events, which are auth events but not part
// of the rewritten state
// C - A "new" event, which include all of the rewrite events in its
// state
for _, authOrStateEvent := range authAndStateEvents {
if authOrStateEvent.StateKey() == nil {
continue
}
if haveEventIDs[authOrStateEvent.EventID()] {
continue
}
if event.StateKey() == nil {
continue
}
// We will handle an event as if it's an outlier if one of the
// following conditions is true:
storeAsOutlier := false
if _, ok := isCurrentState[authOrStateEvent.EventID()]; !ok {
// The event is an auth event and isn't a part of the state set.
// We'll send it as an outlier because we need it to be stored
// in case something is referring to it as an auth event.
storeAsOutlier = true
}
if storeAsOutlier {
ires = append(ires, InputRoomEvent{
Kind: KindOutlier,
Event: authOrStateEvent.Headered(event.RoomVersion),
AuthEventIDs: authOrStateEvent.AuthEventIDs(),
})
continue
}
// If the event isn't an outlier then we'll instead send it as a
// rewrite event, so that it'll form part of the rewritten state.
// These events will go through the membership and latest event
// updaters and we will generate output events, but they will be
// flagged as non-current (i.e. didn't just happen) events.
// Each of these rewrite events includes all of the rewrite events
// that came before in their StateEventIDs.
ires = append(ires, InputRoomEvent{
Kind: KindRewrite,
Event: authOrStateEvent.Headered(event.RoomVersion),
AuthEventIDs: authOrStateEvent.AuthEventIDs(),
HasState: true,
StateEventIDs: stateIDs,
})
// Add the event ID into the StateEventIDs of all subsequent
// rewrite events, and the new event.
stateIDs = append(stateIDs, authOrStateEvent.EventID())
}
// Send the final event as a new event, which will generate
// a timeline output event for it. All of the rewrite events
// that came before will be sent as StateEventIDs, forming a
// new clean state before the event.
ires = append(ires, InputRoomEvent{
Kind: KindNew,
Event: event,
AuthEventIDs: event.AuthEventIDs(),
HasState: true,
StateEventIDs: stateIDs,
})
return SendInputRoomEvents(ctx, rsAPI, ires)
}
// SendInputRoomEvents to the roomserver.
func SendInputRoomEvents(
ctx context.Context, rsAPI RoomserverInternalAPI, ires []InputRoomEvent,
) error {
request := InputRoomEventsRequest{InputRoomEvents: ires}
var response InputRoomEventsResponse
rsAPI.InputRoomEvents(ctx, &request, &response)
return response.Err()
}
// SendInvite event to the roomserver.
// This should only be needed for invite events that occur outside of a known room.
// If we are in the room then the event should be sent using the SendEvents method.
func SendInvite(
ctx context.Context,
rsAPI RoomserverInternalAPI, inviteEvent gomatrixserverlib.HeaderedEvent,
inviteRoomState []gomatrixserverlib.InviteV2StrippedState,
sendAsServer gomatrixserverlib.ServerName, txnID *TransactionID,
) error {
// Start by sending the invite request into the roomserver. This will
// trigger the federation request amongst other things if needed.
request := &PerformInviteRequest{
Event: inviteEvent,
InviteRoomState: inviteRoomState,
RoomVersion: inviteEvent.RoomVersion,
SendAsServer: string(sendAsServer),
TransactionID: txnID,
}
response := &PerformInviteResponse{}
if err := rsAPI.PerformInvite(ctx, request, response); err != nil {
return fmt.Errorf("rsAPI.PerformInvite: %w", err)
}
if response.Error != nil {
return response.Error
}
return nil
}
// GetEvent returns the event or nil, even on errors.
func GetEvent(ctx context.Context, rsAPI RoomserverInternalAPI, eventID string) *gomatrixserverlib.HeaderedEvent {
var res QueryEventsByIDResponse
err := rsAPI.QueryEventsByID(ctx, &QueryEventsByIDRequest{
EventIDs: []string{eventID},
}, &res)
if err != nil {
util.GetLogger(ctx).WithError(err).Error("Failed to QueryEventsByID")
return nil
}
if len(res.Events) != 1 {
return nil
}
return &res.Events[0]
}
// GetStateEvent returns the current state event in the room or nil.
func GetStateEvent(ctx context.Context, rsAPI RoomserverInternalAPI, roomID string, tuple gomatrixserverlib.StateKeyTuple) *gomatrixserverlib.HeaderedEvent {
var res QueryCurrentStateResponse
err := rsAPI.QueryCurrentState(ctx, &QueryCurrentStateRequest{
RoomID: roomID,
StateTuples: []gomatrixserverlib.StateKeyTuple{tuple},
}, &res)
if err != nil {
util.GetLogger(ctx).WithError(err).Error("Failed to QueryCurrentState")
return nil
}
ev, ok := res.StateEvents[tuple]
if ok {
return ev
}
return nil
}
// IsServerBannedFromRoom returns whether the server is banned from a room by server ACLs.
func IsServerBannedFromRoom(ctx context.Context, rsAPI RoomserverInternalAPI, roomID string, serverName gomatrixserverlib.ServerName) bool {
req := &QueryServerBannedFromRoomRequest{
ServerName: serverName,
RoomID: roomID,
}
res := &QueryServerBannedFromRoomResponse{}
if err := rsAPI.QueryServerBannedFromRoom(ctx, req, res); err != nil {
util.GetLogger(ctx).WithError(err).Error("Failed to QueryServerBannedFromRoom")
return true
}
return res.Banned
}
// PopulatePublicRooms extracts PublicRoom information for all the provided room IDs. The IDs are not checked to see if they are visible in the
// published room directory.
// due to lots of switches
// nolint:gocyclo
func PopulatePublicRooms(ctx context.Context, roomIDs []string, rsAPI RoomserverInternalAPI) ([]gomatrixserverlib.PublicRoom, error) {
avatarTuple := gomatrixserverlib.StateKeyTuple{EventType: "m.room.avatar", StateKey: ""}
nameTuple := gomatrixserverlib.StateKeyTuple{EventType: "m.room.name", StateKey: ""}
canonicalTuple := gomatrixserverlib.StateKeyTuple{EventType: gomatrixserverlib.MRoomCanonicalAlias, StateKey: ""}
topicTuple := gomatrixserverlib.StateKeyTuple{EventType: "m.room.topic", StateKey: ""}
guestTuple := gomatrixserverlib.StateKeyTuple{EventType: "m.room.guest_access", StateKey: ""}
visibilityTuple := gomatrixserverlib.StateKeyTuple{EventType: gomatrixserverlib.MRoomHistoryVisibility, StateKey: ""}
joinRuleTuple := gomatrixserverlib.StateKeyTuple{EventType: gomatrixserverlib.MRoomJoinRules, StateKey: ""}
var stateRes QueryBulkStateContentResponse
err := rsAPI.QueryBulkStateContent(ctx, &QueryBulkStateContentRequest{
RoomIDs: roomIDs,
AllowWildcards: true,
StateTuples: []gomatrixserverlib.StateKeyTuple{
nameTuple, canonicalTuple, topicTuple, guestTuple, visibilityTuple, joinRuleTuple, avatarTuple,
{EventType: gomatrixserverlib.MRoomMember, StateKey: "*"},
},
}, &stateRes)
if err != nil {
util.GetLogger(ctx).WithError(err).Error("QueryBulkStateContent failed")
return nil, err
}
chunk := make([]gomatrixserverlib.PublicRoom, len(roomIDs))
i := 0
for roomID, data := range stateRes.Rooms {
pub := gomatrixserverlib.PublicRoom{
RoomID: roomID,
}
joinCount := 0
var joinRule, guestAccess string
for tuple, contentVal := range data {
if tuple.EventType == gomatrixserverlib.MRoomMember && contentVal == "join" {
joinCount++
continue
}
switch tuple {
case avatarTuple:
pub.AvatarURL = contentVal
case nameTuple:
pub.Name = contentVal
case topicTuple:
pub.Topic = contentVal
case canonicalTuple:
pub.CanonicalAlias = contentVal
case visibilityTuple:
pub.WorldReadable = contentVal == "world_readable"
// need both of these to determine whether guests can join
case joinRuleTuple:
joinRule = contentVal
case guestTuple:
guestAccess = contentVal
}
}
if joinRule == gomatrixserverlib.Public && guestAccess == "can_join" {
pub.GuestCanJoin = true
}
pub.JoinedMembersCount = joinCount
chunk[i] = pub
i++
}
return chunk, nil
}