dendrite/federationsender/internal/perform.go

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package internal
import (
"context"
"fmt"
"time"
"github.com/matrix-org/dendrite/federationsender/api"
"github.com/matrix-org/dendrite/federationsender/internal/perform"
"github.com/matrix-org/dendrite/roomserver/version"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
"github.com/sirupsen/logrus"
)
// PerformLeaveRequest implements api.FederationSenderInternalAPI
func (r *FederationSenderInternalAPI) PerformDirectoryLookup(
ctx context.Context,
request *api.PerformDirectoryLookupRequest,
response *api.PerformDirectoryLookupResponse,
) (err error) {
dir, err := r.federation.LookupRoomAlias(
ctx,
request.ServerName,
request.RoomAlias,
)
if err != nil {
r.statistics.ForServer(request.ServerName).Failure()
return err
}
response.RoomID = dir.RoomID
response.ServerNames = dir.Servers
r.statistics.ForServer(request.ServerName).Success()
return nil
}
// PerformJoinRequest implements api.FederationSenderInternalAPI
func (r *FederationSenderInternalAPI) PerformJoin(
ctx context.Context,
request *api.PerformJoinRequest,
response *api.PerformJoinResponse,
) (err error) {
// Look up the supported room versions.
var supportedVersions []gomatrixserverlib.RoomVersion
for version := range version.SupportedRoomVersions() {
supportedVersions = append(supportedVersions, version)
}
// Deduplicate the server names we were provided.
util.Unique(request.ServerNames)
// Try each server that we were provided until we land on one that
// successfully completes the make-join send-join dance.
for _, serverName := range request.ServerNames {
// Try to perform a make_join using the information supplied in the
// request.
respMakeJoin, err := r.federation.MakeJoin(
ctx,
serverName,
request.RoomID,
request.UserID,
supportedVersions,
)
if err != nil {
// TODO: Check if the user was not allowed to join the room.
r.statistics.ForServer(serverName).Failure()
return fmt.Errorf("r.federation.MakeJoin: %w", err)
}
// Set all the fields to be what they should be, this should be a no-op
// but it's possible that the remote server returned us something "odd"
respMakeJoin.JoinEvent.Type = gomatrixserverlib.MRoomMember
respMakeJoin.JoinEvent.Sender = request.UserID
respMakeJoin.JoinEvent.StateKey = &request.UserID
respMakeJoin.JoinEvent.RoomID = request.RoomID
respMakeJoin.JoinEvent.Redacts = ""
if request.Content == nil {
request.Content = map[string]interface{}{}
}
request.Content["membership"] = "join"
if err = respMakeJoin.JoinEvent.SetContent(request.Content); err != nil {
return fmt.Errorf("respMakeJoin.JoinEvent.SetContent: %w", err)
}
if err = respMakeJoin.JoinEvent.SetUnsigned(struct{}{}); err != nil {
return fmt.Errorf("respMakeJoin.JoinEvent.SetUnsigned: %w", err)
}
// Work out if we support the room version that has been supplied in
// the make_join response.
if respMakeJoin.RoomVersion == "" {
respMakeJoin.RoomVersion = gomatrixserverlib.RoomVersionV1
}
if _, err = respMakeJoin.RoomVersion.EventFormat(); err != nil {
return fmt.Errorf("respMakeJoin.RoomVersion.EventFormat: %w", err)
}
// Build the join event.
event, err := respMakeJoin.JoinEvent.Build(
time.Now(),
r.cfg.Matrix.ServerName,
r.cfg.Matrix.KeyID,
r.cfg.Matrix.PrivateKey,
respMakeJoin.RoomVersion,
)
if err != nil {
return fmt.Errorf("respMakeJoin.JoinEvent.Build: %w", err)
}
// Try to perform a send_join using the newly built event.
respSendJoin, err := r.federation.SendJoin(
ctx,
serverName,
event,
respMakeJoin.RoomVersion,
)
if err != nil {
logrus.WithError(err).Warnf("r.federation.SendJoin failed")
r.statistics.ForServer(serverName).Failure()
continue
}
// Check that the send_join response was valid.
joinCtx := perform.JoinContext(r.federation, r.keyRing)
if err = joinCtx.CheckSendJoinResponse(
ctx, event, serverName, respMakeJoin, respSendJoin,
); err != nil {
logrus.WithError(err).Warnf("joinCtx.CheckSendJoinResponse failed")
continue
}
// If we successfully performed a send_join above then the other
// server now thinks we're a part of the room. Send the newly
// returned state to the roomserver to update our local view.
if err = r.producer.SendEventWithState(
ctx,
respSendJoin.ToRespState(),
event.Headered(respMakeJoin.RoomVersion),
); err != nil {
logrus.WithError(err).Warnf("r.producer.SendEventWithState failed")
continue
}
// We're all good.
r.statistics.ForServer(serverName).Success()
return nil
}
// If we reach here then we didn't complete a join for some reason.
return fmt.Errorf(
"failed to join user %q to room %q through %d server(s)",
request.UserID, request.RoomID, len(request.ServerNames),
)
}
// PerformLeaveRequest implements api.FederationSenderInternalAPI
func (r *FederationSenderInternalAPI) PerformLeave(
ctx context.Context,
request *api.PerformLeaveRequest,
response *api.PerformLeaveResponse,
) (err error) {
// Deduplicate the server names we were provided.
util.Unique(request.ServerNames)
// Try each server that we were provided until we land on one that
// successfully completes the make-leave send-leave dance.
for _, serverName := range request.ServerNames {
// Try to perform a make_leave using the information supplied in the
// request.
respMakeLeave, err := r.federation.MakeLeave(
ctx,
serverName,
request.RoomID,
request.UserID,
)
if err != nil {
// TODO: Check if the user was not allowed to leave the room.
logrus.WithError(err).Warnf("r.federation.MakeLeave failed")
r.statistics.ForServer(serverName).Failure()
continue
}
// Set all the fields to be what they should be, this should be a no-op
// but it's possible that the remote server returned us something "odd"
respMakeLeave.LeaveEvent.Type = gomatrixserverlib.MRoomMember
respMakeLeave.LeaveEvent.Sender = request.UserID
respMakeLeave.LeaveEvent.StateKey = &request.UserID
respMakeLeave.LeaveEvent.RoomID = request.RoomID
respMakeLeave.LeaveEvent.Redacts = ""
if respMakeLeave.LeaveEvent.Content == nil {
content := map[string]interface{}{
"membership": "leave",
}
if err = respMakeLeave.LeaveEvent.SetContent(content); err != nil {
logrus.WithError(err).Warnf("respMakeLeave.LeaveEvent.SetContent failed")
continue
}
}
if err = respMakeLeave.LeaveEvent.SetUnsigned(struct{}{}); err != nil {
logrus.WithError(err).Warnf("respMakeLeave.LeaveEvent.SetUnsigned failed")
continue
}
// Work out if we support the room version that has been supplied in
// the make_leave response.
if _, err = respMakeLeave.RoomVersion.EventFormat(); err != nil {
return gomatrixserverlib.UnsupportedRoomVersionError{}
}
// Build the leave event.
event, err := respMakeLeave.LeaveEvent.Build(
time.Now(),
r.cfg.Matrix.ServerName,
r.cfg.Matrix.KeyID,
r.cfg.Matrix.PrivateKey,
respMakeLeave.RoomVersion,
)
if err != nil {
logrus.WithError(err).Warnf("respMakeLeave.LeaveEvent.Build failed")
continue
}
// Try to perform a send_leave using the newly built event.
err = r.federation.SendLeave(
ctx,
serverName,
event,
)
if err != nil {
logrus.WithError(err).Warnf("r.federation.SendLeave failed")
r.statistics.ForServer(serverName).Failure()
continue
}
r.statistics.ForServer(serverName).Success()
return nil
}
// If we reach here then we didn't complete a leave for some reason.
return fmt.Errorf(
"Failed to leave room %q through %d server(s)",
request.RoomID, len(request.ServerNames),
)
}