dendrite/common/events.go
Neil Alexander dacee648f7
Federation for v3/v4 rooms (#954)
* Update gomatrixserverlib

* Default to room version 4

* Update gomatrixserverlib

* Limit prev_events and auth_events

* Fix auth_events, prev_events

* Fix linter issues

* Update gomatrixserverlib

* Fix getState

* Update sytest-whitelist

* Squashed commit of the following:

commit 067b875063
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Fri Apr 3 14:29:06 2020 +0100

    Invites v2 endpoint (#952)

    * Start converting v1 invite endpoint to v2

    * Update gomatrixserverlib

    * Early federationsender code for sending invites

    * Sending invites sorta happens now

    * Populate invite request with stripped state

    * Remodel a bit, don't reflect received invites

    * Handle invite_room_state

    * Handle room versions a bit better

    * Update gomatrixserverlib

    * Tweak order in destinationQueue.next

    * Revert check in processMessage

    * Tweak federation sender destination queue code a bit

    * Add comments

commit 955244c092
Author: Ben B <benne@klimlive.de>
Date:   Fri Apr 3 12:40:50 2020 +0200

    use custom http client instead of the http DefaultClient (#823)

    This commit replaces the default client from the http lib with a custom one.
    The previously used default client doesn't come with a timeout. This could cause
    unwanted locks.
    That solution chosen here creates a http client in the base component dendrite
    with a constant timeout of 30 seconds. If it should be necessary to overwrite
    this, we could include the timeout in the dendrite configuration.
    Here it would be a good idea to extend the type "Address" by a timeout and
    create an http client for each service.

    Closes #820

    Signed-off-by: Benedikt Bongartz <benne@klimlive.de>

    Co-authored-by: Kegsay <kegan@matrix.org>

* Update sytest-whitelist, sytest-blacklist

* Update go.mod/go.sum

* Add some error wrapping for debug

* Add a NOTSPEC to common/events.go

* Perform state resolution at send_join

* Set default room version to v2 again

* Tweak GetCapabilities

* Add comments to ResolveConflictsAdhoc

* Update sytest-blacklist

* go mod tidy

* Update sytest-whitelist, sytest-blacklist

* Update versions

* Updates from review comments

* Update sytest-blacklist, sytest-whitelist

* Check room versions compatible at make_join, add some comments, update gomatrixserverlib, other tweaks

* Set default room version back to v2

* Update gomatrixserverlib, sytest-whitelist
2020-04-09 15:46:06 +01:00

147 lines
4.5 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"
)
// 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) {
if queryRes == nil {
queryRes = &api.QueryLatestEventsAndStateResponse{}
}
err := AddPrevEventsToEvent(ctx, builder, queryAPI, queryRes)
if err != nil {
// This can pass through a ErrRoomNoExists to the caller
return nil, err
}
event, err := builder.Build(
evTime, cfg.Matrix.ServerName, cfg.Matrix.KeyID,
cfg.Matrix.PrivateKey, queryRes.RoomVersion,
)
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 fmt.Errorf("gomatrixserverlib.StateNeededForEventBuilder: %w", err)
}
// Ask the roomserver for information about this room
queryReq := api.QueryLatestEventsAndStateRequest{
RoomID: builder.RoomID,
StateToFetch: eventsNeeded.Tuples(),
}
if err = queryAPI.QueryLatestEventsAndState(ctx, &queryReq, queryRes); err != nil {
return fmt.Errorf("queryAPI.QueryLatestEventsAndState: %w", err)
}
if !queryRes.RoomExists {
return ErrRoomNoExists
}
eventFormat, err := queryRes.RoomVersion.EventFormat()
if err != nil {
return fmt.Errorf("queryRes.RoomVersion.EventFormat: %w", err)
}
builder.Depth = queryRes.Depth
authEvents := gomatrixserverlib.NewAuthEvents(nil)
for i := range queryRes.StateEvents {
err = authEvents.AddEvent(&queryRes.StateEvents[i].Event)
if err != nil {
return fmt.Errorf("authEvents.AddEvent: %w", err)
}
}
refs, err := eventsNeeded.AuthEventReferences(&authEvents)
if err != nil {
return fmt.Errorf("eventsNeeded.AuthEventReferences: %w", err)
}
truncAuth, truncPrev := truncateAuthAndPrevEvents(refs, queryRes.LatestEvents)
switch eventFormat {
case gomatrixserverlib.EventFormatV1:
builder.AuthEvents = truncAuth
builder.PrevEvents = truncPrev
case gomatrixserverlib.EventFormatV2:
v2AuthRefs, v2PrevRefs := []string{}, []string{}
for _, ref := range truncAuth {
v2AuthRefs = append(v2AuthRefs, ref.EventID)
}
for _, ref := range truncPrev {
v2PrevRefs = append(v2PrevRefs, ref.EventID)
}
builder.AuthEvents = v2AuthRefs
builder.PrevEvents = v2PrevRefs
}
return nil
}
// truncateAuthAndPrevEvents limits the number of events we add into
// an event as prev_events or auth_events.
// NOTSPEC: The limits here feel a bit arbitrary but they are currently
// here because of https://github.com/matrix-org/matrix-doc/issues/2307
// and because Synapse will just drop events that don't comply.
func truncateAuthAndPrevEvents(auth, prev []gomatrixserverlib.EventReference) (
truncAuth, truncPrev []gomatrixserverlib.EventReference,
) {
truncAuth, truncPrev = auth, prev
if len(truncAuth) > 10 {
truncAuth = truncAuth[:10]
}
if len(truncPrev) > 20 {
truncPrev = truncPrev[:20]
}
return
}