dendrite/roomserver/internal/perform/perform_upgrade.go
Sam Wedgwood c7193e24d0
Use *spec.SenderID for QuerySenderIDForUser (#3164)
There are cases where a dendrite instance is unaware of a pseudo ID for
a user, the user is not a member of that room. To represent this case,
we currently use the 'zero' value, which is often not checked and so
causes errors later down the line. To make this case more explict, and
to be consistent with `QueryUserIDForSender`, this PR changes this to
use a pointer (and `nil` to mean no sender ID).

Signed-off-by: `Sam Wedgwood <sam@wedgwood.dev>`
2023-08-02 11:12:14 +01:00

650 lines
24 KiB
Go

// Copyright 2022 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 perform
import (
"context"
"encoding/json"
"fmt"
"time"
"github.com/matrix-org/dendrite/internal/eventutil"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/dendrite/setup/config"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/gomatrixserverlib/spec"
"github.com/matrix-org/util"
"github.com/sirupsen/logrus"
)
type Upgrader struct {
Cfg *config.RoomServer
URSAPI api.RoomserverInternalAPI
}
// PerformRoomUpgrade upgrades a room from one version to another
func (r *Upgrader) PerformRoomUpgrade(
ctx context.Context,
roomID string, userID spec.UserID, roomVersion gomatrixserverlib.RoomVersion,
) (newRoomID string, err error) {
return r.performRoomUpgrade(ctx, roomID, userID, roomVersion)
}
func (r *Upgrader) performRoomUpgrade(
ctx context.Context,
roomID string, userID spec.UserID, roomVersion gomatrixserverlib.RoomVersion,
) (string, error) {
evTime := time.Now()
// Return an immediate error if the room does not exist
if err := r.validateRoomExists(ctx, roomID); err != nil {
return "", err
}
fullRoomID, err := spec.NewRoomID(roomID)
if err != nil {
return "", err
}
senderID, err := r.URSAPI.QuerySenderIDForUser(ctx, *fullRoomID, userID)
if err != nil {
util.GetLogger(ctx).WithError(err).Error("Failed getting senderID for user")
return "", err
} else if senderID == nil {
util.GetLogger(ctx).WithField("userID", userID).WithField("roomID", *fullRoomID).Error("No senderID for user")
return "", fmt.Errorf("No sender ID for %s in %s", userID, *fullRoomID)
}
// 1. Check if the user is authorized to actually perform the upgrade (can send m.room.tombstone)
if !r.userIsAuthorized(ctx, *senderID, roomID) {
return "", api.ErrNotAllowed{Err: fmt.Errorf("You don't have permission to upgrade the room, power level too low.")}
}
// TODO (#267): Check room ID doesn't clash with an existing one, and we
// probably shouldn't be using pseudo-random strings, maybe GUIDs?
newRoomID := fmt.Sprintf("!%s:%s", util.RandomString(16), userID.Domain())
// Get the existing room state for the old room.
oldRoomReq := &api.QueryLatestEventsAndStateRequest{
RoomID: roomID,
}
oldRoomRes := &api.QueryLatestEventsAndStateResponse{}
if err := r.URSAPI.QueryLatestEventsAndState(ctx, oldRoomReq, oldRoomRes); err != nil {
return "", fmt.Errorf("Failed to get latest state: %s", err)
}
// Make the tombstone event
tombstoneEvent, pErr := r.makeTombstoneEvent(ctx, evTime, *senderID, userID.Domain(), roomID, newRoomID)
if pErr != nil {
return "", pErr
}
// Generate the initial events we need to send into the new room. This includes copied state events and bans
// as well as the power level events needed to set up the room
eventsToMake, pErr := r.generateInitialEvents(ctx, oldRoomRes, *senderID, roomID, roomVersion, tombstoneEvent)
if pErr != nil {
return "", pErr
}
// Send the setup events to the new room
if pErr = r.sendInitialEvents(ctx, evTime, *senderID, userID.Domain(), newRoomID, roomVersion, eventsToMake); pErr != nil {
return "", pErr
}
// 5. Send the tombstone event to the old room
if pErr = r.sendHeaderedEvent(ctx, userID.Domain(), tombstoneEvent, string(userID.Domain())); pErr != nil {
return "", pErr
}
// If the old room was public, make sure the new one is too
if pErr = r.publishIfOldRoomWasPublic(ctx, roomID, newRoomID); pErr != nil {
return "", pErr
}
// If the old room had a canonical alias event, it should be deleted in the old room
if pErr = r.clearOldCanonicalAliasEvent(ctx, oldRoomRes, evTime, *senderID, userID.Domain(), roomID); pErr != nil {
return "", pErr
}
// 4. Move local aliases to the new room
if pErr = moveLocalAliases(ctx, roomID, newRoomID, *senderID, r.URSAPI); pErr != nil {
return "", pErr
}
// 6. Restrict power levels in the old room
if pErr = r.restrictOldRoomPowerLevels(ctx, evTime, *senderID, userID.Domain(), roomID); pErr != nil {
return "", pErr
}
return newRoomID, nil
}
func (r *Upgrader) getRoomPowerLevels(ctx context.Context, roomID string) (*gomatrixserverlib.PowerLevelContent, error) {
oldPowerLevelsEvent := api.GetStateEvent(ctx, r.URSAPI, roomID, gomatrixserverlib.StateKeyTuple{
EventType: spec.MRoomPowerLevels,
StateKey: "",
})
return oldPowerLevelsEvent.PowerLevels()
}
func (r *Upgrader) restrictOldRoomPowerLevels(ctx context.Context, evTime time.Time, senderID spec.SenderID, userDomain spec.ServerName, roomID string) error {
restrictedPowerLevelContent, pErr := r.getRoomPowerLevels(ctx, roomID)
if pErr != nil {
return pErr
}
// From: https://spec.matrix.org/v1.2/client-server-api/#server-behaviour-16
// If possible, the power levels in the old room should also be modified to
// prevent sending of events and inviting new users. For example, setting
// events_default and invite to the greater of 50 and users_default + 1.
restrictedDefaultPowerLevel := int64(50)
if restrictedPowerLevelContent.UsersDefault+1 > restrictedDefaultPowerLevel {
restrictedDefaultPowerLevel = restrictedPowerLevelContent.UsersDefault + 1
}
restrictedPowerLevelContent.EventsDefault = restrictedDefaultPowerLevel
restrictedPowerLevelContent.Invite = restrictedDefaultPowerLevel
restrictedPowerLevelsHeadered, resErr := r.makeHeaderedEvent(ctx, evTime, senderID, userDomain, roomID, gomatrixserverlib.FledglingEvent{
Type: spec.MRoomPowerLevels,
StateKey: "",
Content: restrictedPowerLevelContent,
})
switch resErr.(type) {
case api.ErrNotAllowed:
util.GetLogger(ctx).WithField(logrus.ErrorKey, resErr).Warn("UpgradeRoom: Could not restrict power levels in old room")
case nil:
return r.sendHeaderedEvent(ctx, userDomain, restrictedPowerLevelsHeadered, api.DoNotSendToOtherServers)
default:
return resErr
}
return nil
}
func moveLocalAliases(ctx context.Context,
roomID, newRoomID string, senderID spec.SenderID,
URSAPI api.RoomserverInternalAPI,
) (err error) {
aliasReq := api.GetAliasesForRoomIDRequest{RoomID: roomID}
aliasRes := api.GetAliasesForRoomIDResponse{}
if err = URSAPI.GetAliasesForRoomID(ctx, &aliasReq, &aliasRes); err != nil {
return fmt.Errorf("Failed to get old room aliases: %w", err)
}
// TODO: this should be spec.RoomID further up the call stack
parsedNewRoomID, err := spec.NewRoomID(newRoomID)
if err != nil {
return err
}
for _, alias := range aliasRes.Aliases {
aliasFound, aliasRemoved, err := URSAPI.RemoveRoomAlias(ctx, senderID, alias)
if err != nil {
return fmt.Errorf("Failed to remove old room alias: %w", err)
} else if !aliasFound {
return fmt.Errorf("Failed to remove old room alias: alias not found, possible race")
} else if !aliasRemoved {
return fmt.Errorf("Failed to remove old alias")
}
aliasAlreadyExists, err := URSAPI.SetRoomAlias(ctx, senderID, *parsedNewRoomID, alias)
if err != nil {
return fmt.Errorf("Failed to set new room alias: %w", err)
} else if aliasAlreadyExists {
return fmt.Errorf("Failed to set new room alias: alias exists when it should have just been removed")
}
}
return nil
}
func (r *Upgrader) clearOldCanonicalAliasEvent(ctx context.Context, oldRoom *api.QueryLatestEventsAndStateResponse, evTime time.Time, senderID spec.SenderID, userDomain spec.ServerName, roomID string) error {
for _, event := range oldRoom.StateEvents {
if event.Type() != spec.MRoomCanonicalAlias || !event.StateKeyEquals("") {
continue
}
var aliasContent struct {
Alias string `json:"alias"`
AltAliases []string `json:"alt_aliases"`
}
if err := json.Unmarshal(event.Content(), &aliasContent); err != nil {
return fmt.Errorf("failed to unmarshal canonical aliases: %w", err)
}
if aliasContent.Alias == "" && len(aliasContent.AltAliases) == 0 {
// There are no canonical aliases to clear, therefore do nothing.
return nil
}
}
emptyCanonicalAliasEvent, resErr := r.makeHeaderedEvent(ctx, evTime, senderID, userDomain, roomID, gomatrixserverlib.FledglingEvent{
Type: spec.MRoomCanonicalAlias,
Content: map[string]interface{}{},
})
switch resErr.(type) {
case api.ErrNotAllowed:
util.GetLogger(ctx).WithField(logrus.ErrorKey, resErr).Warn("UpgradeRoom: Could not set empty canonical alias event in old room")
case nil:
return r.sendHeaderedEvent(ctx, userDomain, emptyCanonicalAliasEvent, api.DoNotSendToOtherServers)
default:
return resErr
}
return nil
}
func (r *Upgrader) publishIfOldRoomWasPublic(ctx context.Context, roomID, newRoomID string) error {
// check if the old room was published
var pubQueryRes api.QueryPublishedRoomsResponse
err := r.URSAPI.QueryPublishedRooms(ctx, &api.QueryPublishedRoomsRequest{
RoomID: roomID,
}, &pubQueryRes)
if err != nil {
return err
}
// if the old room is published (was public), publish the new room
if len(pubQueryRes.RoomIDs) == 1 {
publishNewRoomAndUnpublishOldRoom(ctx, r.URSAPI, roomID, newRoomID)
}
return nil
}
func publishNewRoomAndUnpublishOldRoom(
ctx context.Context,
URSAPI api.RoomserverInternalAPI,
oldRoomID, newRoomID string,
) {
// expose this room in the published room list
if err := URSAPI.PerformPublish(ctx, &api.PerformPublishRequest{
RoomID: newRoomID,
Visibility: spec.Public,
}); err != nil {
// treat as non-fatal since the room is already made by this point
util.GetLogger(ctx).WithError(err).Error("failed to publish room")
}
// remove the old room from the published room list
if err := URSAPI.PerformPublish(ctx, &api.PerformPublishRequest{
RoomID: oldRoomID,
Visibility: "private",
}); err != nil {
// treat as non-fatal since the room is already made by this point
util.GetLogger(ctx).WithError(err).Error("failed to un-publish room")
}
}
func (r *Upgrader) validateRoomExists(ctx context.Context, roomID string) error {
if _, err := r.URSAPI.QueryRoomVersionForRoom(ctx, roomID); err != nil {
return eventutil.ErrRoomNoExists{}
}
return nil
}
func (r *Upgrader) userIsAuthorized(ctx context.Context, senderID spec.SenderID, roomID string,
) bool {
plEvent := api.GetStateEvent(ctx, r.URSAPI, roomID, gomatrixserverlib.StateKeyTuple{
EventType: spec.MRoomPowerLevels,
StateKey: "",
})
if plEvent == nil {
return false
}
pl, err := plEvent.PowerLevels()
if err != nil {
return false
}
// Check for power level required to send tombstone event (marks the current room as obsolete),
// if not found, use the StateDefault power level
return pl.UserLevel(senderID) >= pl.EventLevel("m.room.tombstone", true)
}
// nolint:gocyclo
func (r *Upgrader) generateInitialEvents(ctx context.Context, oldRoom *api.QueryLatestEventsAndStateResponse, senderID spec.SenderID, roomID string, newVersion gomatrixserverlib.RoomVersion, tombstoneEvent *types.HeaderedEvent) ([]gomatrixserverlib.FledglingEvent, error) {
state := make(map[gomatrixserverlib.StateKeyTuple]*types.HeaderedEvent, len(oldRoom.StateEvents))
for _, event := range oldRoom.StateEvents {
if event.StateKey() == nil {
// This shouldn't ever happen, but better to be safe than sorry.
continue
}
if event.Type() == spec.MRoomMember && !event.StateKeyEquals(string(senderID)) {
// With the exception of bans which we do want to copy, we
// should ignore membership events that aren't our own, as event auth will
// prevent us from being able to create membership events on behalf of other
// users anyway unless they are invites or bans.
membership, err := event.Membership()
if err != nil {
continue
}
switch membership {
case spec.Ban:
default:
continue
}
}
// skip events that rely on a specific user being present
// TODO: What to do here for pseudoIDs? It's checking non-member events for state keys with userIDs.
sKey := *event.StateKey()
if event.Type() != spec.MRoomMember && len(sKey) > 0 && sKey[:1] == "@" {
continue
}
state[gomatrixserverlib.StateKeyTuple{EventType: event.Type(), StateKey: *event.StateKey()}] = event
}
// The following events are ones that we are going to override manually
// in the following section.
override := map[gomatrixserverlib.StateKeyTuple]struct{}{
{EventType: spec.MRoomCreate, StateKey: ""}: {},
{EventType: spec.MRoomMember, StateKey: string(senderID)}: {},
{EventType: spec.MRoomPowerLevels, StateKey: ""}: {},
{EventType: spec.MRoomJoinRules, StateKey: ""}: {},
}
// The overridden events are essential events that must be present in the
// old room state. Check that they are there.
for tuple := range override {
if _, ok := state[tuple]; !ok {
return nil, fmt.Errorf("essential event of type %q state key %q is missing", tuple.EventType, tuple.StateKey)
}
}
oldCreateEvent := state[gomatrixserverlib.StateKeyTuple{EventType: spec.MRoomCreate, StateKey: ""}]
oldMembershipEvent := state[gomatrixserverlib.StateKeyTuple{EventType: spec.MRoomMember, StateKey: string(senderID)}]
oldPowerLevelsEvent := state[gomatrixserverlib.StateKeyTuple{EventType: spec.MRoomPowerLevels, StateKey: ""}]
oldJoinRulesEvent := state[gomatrixserverlib.StateKeyTuple{EventType: spec.MRoomJoinRules, StateKey: ""}]
// Create the new room create event. Using a map here instead of CreateContent
// means that we preserve any other interesting fields that might be present
// in the create event (such as for the room types MSC).
newCreateContent := map[string]interface{}{}
_ = json.Unmarshal(oldCreateEvent.Content(), &newCreateContent)
newCreateContent["creator"] = string(senderID)
newCreateContent["room_version"] = newVersion
newCreateContent["predecessor"] = gomatrixserverlib.PreviousRoom{
EventID: tombstoneEvent.EventID(),
RoomID: roomID,
}
newCreateEvent := gomatrixserverlib.FledglingEvent{
Type: spec.MRoomCreate,
StateKey: "",
Content: newCreateContent,
}
// Now create the new membership event. Same rules apply as above, so
// that we preserve fields we don't otherwise know about. We'll always
// set the membership to join though, because that is necessary to auth
// the events after it.
newMembershipContent := map[string]interface{}{}
_ = json.Unmarshal(oldMembershipEvent.Content(), &newMembershipContent)
newMembershipContent["membership"] = spec.Join
newMembershipEvent := gomatrixserverlib.FledglingEvent{
Type: spec.MRoomMember,
StateKey: string(senderID),
Content: newMembershipContent,
}
// We might need to temporarily give ourselves a higher power level
// than we had in the old room in order to be able to send all of
// the relevant state events. This function will return whether we
// had to override the power level events or not — if we did, we
// need to send the original power levels again later on.
powerLevelContent, err := oldPowerLevelsEvent.PowerLevels()
if err != nil {
util.GetLogger(ctx).WithError(err).Error()
return nil, fmt.Errorf("Power level event content was invalid")
}
tempPowerLevelsEvent, powerLevelsOverridden := createTemporaryPowerLevels(powerLevelContent, senderID)
// Now do the join rules event, same as the create and membership
// events. We'll set a sane default of "invite" so that if the
// existing join rules contains garbage, the room can still be
// upgraded.
newJoinRulesContent := map[string]interface{}{
"join_rule": spec.Invite, // sane default
}
_ = json.Unmarshal(oldJoinRulesEvent.Content(), &newJoinRulesContent)
newJoinRulesEvent := gomatrixserverlib.FledglingEvent{
Type: spec.MRoomJoinRules,
StateKey: "",
Content: newJoinRulesContent,
}
eventsToMake := make([]gomatrixserverlib.FledglingEvent, 0, len(state))
eventsToMake = append(
eventsToMake, newCreateEvent, newMembershipEvent,
tempPowerLevelsEvent, newJoinRulesEvent,
)
// For some reason Sytest expects there to be a guest access event.
// Create one if it doesn't exist.
if _, ok := state[gomatrixserverlib.StateKeyTuple{EventType: spec.MRoomGuestAccess, StateKey: ""}]; !ok {
eventsToMake = append(eventsToMake, gomatrixserverlib.FledglingEvent{
Type: spec.MRoomGuestAccess,
Content: map[string]string{
"guest_access": "forbidden",
},
})
}
// Duplicate all of the old state events into the new room.
for tuple, event := range state {
if _, ok := override[tuple]; ok {
// Don't duplicate events we have overridden already. They
// are already in `eventsToMake`.
continue
}
newEvent := gomatrixserverlib.FledglingEvent{
Type: tuple.EventType,
StateKey: tuple.StateKey,
}
if err = json.Unmarshal(event.Content(), &newEvent.Content); err != nil {
logrus.WithError(err).Error("Failed to unmarshal old event")
continue
}
eventsToMake = append(eventsToMake, newEvent)
}
// If we sent a temporary power level event into the room before,
// override that now by restoring the original power levels.
if powerLevelsOverridden {
eventsToMake = append(eventsToMake, gomatrixserverlib.FledglingEvent{
Type: spec.MRoomPowerLevels,
Content: powerLevelContent,
})
}
return eventsToMake, nil
}
func (r *Upgrader) sendInitialEvents(ctx context.Context, evTime time.Time, senderID spec.SenderID, userDomain spec.ServerName, newRoomID string, newVersion gomatrixserverlib.RoomVersion, eventsToMake []gomatrixserverlib.FledglingEvent) error {
var err error
var builtEvents []*types.HeaderedEvent
authEvents := gomatrixserverlib.NewAuthEvents(nil)
for i, e := range eventsToMake {
depth := i + 1 // depth starts at 1
proto := gomatrixserverlib.ProtoEvent{
SenderID: string(senderID),
RoomID: newRoomID,
Type: e.Type,
StateKey: &e.StateKey,
Depth: int64(depth),
}
err = proto.SetContent(e.Content)
if err != nil {
return fmt.Errorf("failed to set content of new %q event: %w", proto.Type, err)
}
if i > 0 {
proto.PrevEvents = []string{builtEvents[i-1].EventID()}
}
var verImpl gomatrixserverlib.IRoomVersion
verImpl, err = gomatrixserverlib.GetRoomVersion(newVersion)
if err != nil {
return err
}
builder := verImpl.NewEventBuilderFromProtoEvent(&proto)
if err = builder.AddAuthEvents(&authEvents); err != nil {
return err
}
var event gomatrixserverlib.PDU
event, err = builder.Build(evTime, userDomain, r.Cfg.Matrix.KeyID, r.Cfg.Matrix.PrivateKey)
if err != nil {
return fmt.Errorf("failed to build new %q event: %w", builder.Type, err)
}
if err = gomatrixserverlib.Allowed(event, &authEvents, func(roomID spec.RoomID, senderID spec.SenderID) (*spec.UserID, error) {
return r.URSAPI.QueryUserIDForSender(ctx, roomID, senderID)
}); err != nil {
return fmt.Errorf("Failed to auth new %q event: %w", builder.Type, err)
}
// Add the event to the list of auth events
builtEvents = append(builtEvents, &types.HeaderedEvent{PDU: event})
err = authEvents.AddEvent(event)
if err != nil {
return fmt.Errorf("failed to add new %q event to auth set: %w", builder.Type, err)
}
}
inputs := make([]api.InputRoomEvent, 0, len(builtEvents))
for _, event := range builtEvents {
inputs = append(inputs, api.InputRoomEvent{
Kind: api.KindNew,
Event: event,
Origin: userDomain,
SendAsServer: api.DoNotSendToOtherServers,
})
}
if err = api.SendInputRoomEvents(ctx, r.URSAPI, userDomain, inputs, false); err != nil {
return fmt.Errorf("failed to send new room %q to roomserver: %w", newRoomID, err)
}
return nil
}
func (r *Upgrader) makeTombstoneEvent(
ctx context.Context,
evTime time.Time,
senderID spec.SenderID, senderDomain spec.ServerName, roomID, newRoomID string,
) (*types.HeaderedEvent, error) {
content := map[string]interface{}{
"body": "This room has been replaced",
"replacement_room": newRoomID,
}
event := gomatrixserverlib.FledglingEvent{
Type: "m.room.tombstone",
Content: content,
}
return r.makeHeaderedEvent(ctx, evTime, senderID, senderDomain, roomID, event)
}
func (r *Upgrader) makeHeaderedEvent(ctx context.Context, evTime time.Time, senderID spec.SenderID, senderDomain spec.ServerName, roomID string, event gomatrixserverlib.FledglingEvent) (*types.HeaderedEvent, error) {
proto := gomatrixserverlib.ProtoEvent{
SenderID: string(senderID),
RoomID: roomID,
Type: event.Type,
StateKey: &event.StateKey,
}
err := proto.SetContent(event.Content)
if err != nil {
return nil, fmt.Errorf("failed to set new %q event content: %w", proto.Type, err)
}
// Get the sender domain.
identity, err := r.Cfg.Matrix.SigningIdentityFor(senderDomain)
if err != nil {
return nil, fmt.Errorf("failed to get signing identity for %q: %w", senderDomain, err)
}
var queryRes api.QueryLatestEventsAndStateResponse
headeredEvent, err := eventutil.QueryAndBuildEvent(ctx, &proto, identity, evTime, r.URSAPI, &queryRes)
switch e := err.(type) {
case nil:
case eventutil.ErrRoomNoExists:
return nil, e
case gomatrixserverlib.BadJSONError:
return nil, e
case gomatrixserverlib.EventValidationError:
return nil, e
default:
return nil, fmt.Errorf("failed to build new %q event: %w", proto.Type, err)
}
// check to see if this user can perform this operation
stateEvents := make([]gomatrixserverlib.PDU, len(queryRes.StateEvents))
for i := range queryRes.StateEvents {
stateEvents[i] = queryRes.StateEvents[i].PDU
}
provider := gomatrixserverlib.NewAuthEvents(stateEvents)
if err = gomatrixserverlib.Allowed(headeredEvent.PDU, &provider, func(roomID spec.RoomID, senderID spec.SenderID) (*spec.UserID, error) {
return r.URSAPI.QueryUserIDForSender(ctx, roomID, senderID)
}); err != nil {
return nil, api.ErrNotAllowed{Err: fmt.Errorf("failed to auth new %q event: %w", proto.Type, err)} // TODO: Is this error string comprehensible to the client?
}
return headeredEvent, nil
}
func createTemporaryPowerLevels(powerLevelContent *gomatrixserverlib.PowerLevelContent, senderID spec.SenderID) (gomatrixserverlib.FledglingEvent, bool) {
// Work out what power level we need in order to be able to send events
// of all types into the room.
neededPowerLevel := powerLevelContent.StateDefault
for _, powerLevel := range powerLevelContent.Events {
if powerLevel > neededPowerLevel {
neededPowerLevel = powerLevel
}
}
// Make a copy of the existing power level content.
tempPowerLevelContent := *powerLevelContent
powerLevelsOverridden := false
// At this point, the "Users", "Events" and "Notifications" keys are all
// pointing to the map of the original PL content, so we will specifically
// override the users map with a new one and duplicate the values deeply,
// so that we can modify them without modifying the original.
tempPowerLevelContent.Users = make(map[string]int64, len(powerLevelContent.Users))
for key, value := range powerLevelContent.Users {
tempPowerLevelContent.Users[key] = value
}
// If the user who is upgrading the room doesn't already have sufficient
// power, then elevate their power levels.
if tempPowerLevelContent.UserLevel(senderID) < neededPowerLevel {
tempPowerLevelContent.Users[string(senderID)] = neededPowerLevel
powerLevelsOverridden = true
}
// Then return the temporary power levels event.
return gomatrixserverlib.FledglingEvent{
Type: spec.MRoomPowerLevels,
Content: tempPowerLevelContent,
}, powerLevelsOverridden
}
func (r *Upgrader) sendHeaderedEvent(
ctx context.Context,
serverName spec.ServerName,
headeredEvent *types.HeaderedEvent,
sendAsServer string,
) error {
var inputs []api.InputRoomEvent
inputs = append(inputs, api.InputRoomEvent{
Kind: api.KindNew,
Event: headeredEvent,
Origin: serverName,
SendAsServer: sendAsServer,
})
return api.SendInputRoomEvents(ctx, r.URSAPI, serverName, inputs, false)
}