dendrite/roomserver/internal/query/query.go
devonh a49c9f01e2
Only require room version instead of room info for db.Events() (#3079)
This reduces the API requirements for the Events database to align with
what is actually required.
2023-05-08 19:25:44 +00:00

990 lines
30 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 query
import (
"context"
"database/sql"
"encoding/json"
"errors"
"fmt"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/gomatrixserverlib/spec"
"github.com/matrix-org/util"
"github.com/sirupsen/logrus"
"github.com/matrix-org/dendrite/roomserver/storage/tables"
"github.com/matrix-org/dendrite/syncapi/synctypes"
"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
"github.com/matrix-org/dendrite/internal/caching"
"github.com/matrix-org/dendrite/roomserver/acls"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/roomserver/internal/helpers"
"github.com/matrix-org/dendrite/roomserver/state"
"github.com/matrix-org/dendrite/roomserver/storage"
"github.com/matrix-org/dendrite/roomserver/types"
)
type Queryer struct {
DB storage.Database
Cache caching.RoomServerCaches
IsLocalServerName func(spec.ServerName) bool
ServerACLs *acls.ServerACLs
}
// QueryLatestEventsAndState implements api.RoomserverInternalAPI
func (r *Queryer) QueryLatestEventsAndState(
ctx context.Context,
request *api.QueryLatestEventsAndStateRequest,
response *api.QueryLatestEventsAndStateResponse,
) error {
return helpers.QueryLatestEventsAndState(ctx, r.DB, request, response)
}
// QueryStateAfterEvents implements api.RoomserverInternalAPI
func (r *Queryer) QueryStateAfterEvents(
ctx context.Context,
request *api.QueryStateAfterEventsRequest,
response *api.QueryStateAfterEventsResponse,
) error {
info, err := r.DB.RoomInfo(ctx, request.RoomID)
if err != nil {
return err
}
if info == nil || info.IsStub() {
return nil
}
roomState := state.NewStateResolution(r.DB, info)
response.RoomExists = true
response.RoomVersion = info.RoomVersion
prevStates, err := r.DB.StateAtEventIDs(ctx, request.PrevEventIDs)
if err != nil {
if _, ok := err.(types.MissingEventError); ok {
return nil
}
return err
}
response.PrevEventsExist = true
var stateEntries []types.StateEntry
if len(request.StateToFetch) == 0 {
// Look up all of the current room state.
stateEntries, err = roomState.LoadCombinedStateAfterEvents(
ctx, prevStates,
)
} else {
// Look up the current state for the requested tuples.
stateEntries, err = roomState.LoadStateAfterEventsForStringTuples(
ctx, prevStates, request.StateToFetch,
)
}
if err != nil {
if _, ok := err.(types.MissingEventError); ok {
return nil
}
if _, ok := err.(types.MissingStateError); ok {
return nil
}
return err
}
stateEvents, err := helpers.LoadStateEvents(ctx, r.DB, info, stateEntries)
if err != nil {
return err
}
if len(request.PrevEventIDs) > 1 {
var authEventIDs []string
for _, e := range stateEvents {
authEventIDs = append(authEventIDs, e.AuthEventIDs()...)
}
authEventIDs = util.UniqueStrings(authEventIDs)
authEvents, err := GetAuthChain(ctx, r.DB.EventsFromIDs, info, authEventIDs)
if err != nil {
return fmt.Errorf("getAuthChain: %w", err)
}
stateEvents, err = gomatrixserverlib.ResolveConflicts(
info.RoomVersion, gomatrixserverlib.ToPDUs(stateEvents), gomatrixserverlib.ToPDUs(authEvents),
)
if err != nil {
return fmt.Errorf("state.ResolveConflictsAdhoc: %w", err)
}
}
for _, event := range stateEvents {
response.StateEvents = append(response.StateEvents, &types.HeaderedEvent{PDU: event})
}
return nil
}
// QueryEventsByID queries a list of events by event ID for one room. If no room is specified, it will try to determine
// which room to use by querying the first events roomID.
func (r *Queryer) QueryEventsByID(
ctx context.Context,
request *api.QueryEventsByIDRequest,
response *api.QueryEventsByIDResponse,
) error {
if len(request.EventIDs) == 0 {
return nil
}
var err error
// We didn't receive a room ID, we need to fetch it first before we can continue.
// This happens for e.g. ` /_matrix/federation/v1/event/{eventId}`
var roomInfo *types.RoomInfo
if request.RoomID == "" {
var eventNIDs map[string]types.EventMetadata
eventNIDs, err = r.DB.EventNIDs(ctx, []string{request.EventIDs[0]})
if err != nil {
return err
}
if len(eventNIDs) == 0 {
return nil
}
roomInfo, err = r.DB.RoomInfoByNID(ctx, eventNIDs[request.EventIDs[0]].RoomNID)
} else {
roomInfo, err = r.DB.RoomInfo(ctx, request.RoomID)
}
if err != nil {
return err
}
if roomInfo == nil {
return nil
}
events, err := r.DB.EventsFromIDs(ctx, roomInfo, request.EventIDs)
if err != nil {
return err
}
for _, event := range events {
response.Events = append(response.Events, &types.HeaderedEvent{PDU: event.PDU})
}
return nil
}
// QueryMembershipForUser implements api.RoomserverInternalAPI
func (r *Queryer) QueryMembershipForUser(
ctx context.Context,
request *api.QueryMembershipForUserRequest,
response *api.QueryMembershipForUserResponse,
) error {
info, err := r.DB.RoomInfo(ctx, request.RoomID)
if err != nil {
return err
}
if info == nil {
response.RoomExists = false
return nil
}
response.RoomExists = true
membershipEventNID, stillInRoom, isRoomforgotten, err := r.DB.GetMembership(ctx, info.RoomNID, request.UserID)
if err != nil {
return err
}
response.IsRoomForgotten = isRoomforgotten
if membershipEventNID == 0 {
response.HasBeenInRoom = false
return nil
}
response.IsInRoom = stillInRoom
response.HasBeenInRoom = true
evs, err := r.DB.Events(ctx, info.RoomVersion, []types.EventNID{membershipEventNID})
if err != nil {
return err
}
if len(evs) != 1 {
return fmt.Errorf("failed to load membership event for event NID %d", membershipEventNID)
}
response.EventID = evs[0].EventID()
response.Membership, err = evs[0].Membership()
return err
}
// QueryMembershipAtEvent returns the known memberships at a given event.
// If the state before an event is not known, an empty list will be returned
// for that event instead.
func (r *Queryer) QueryMembershipAtEvent(
ctx context.Context,
request *api.QueryMembershipAtEventRequest,
response *api.QueryMembershipAtEventResponse,
) error {
response.Membership = make(map[string]*types.HeaderedEvent)
info, err := r.DB.RoomInfo(ctx, request.RoomID)
if err != nil {
return fmt.Errorf("unable to get roomInfo: %w", err)
}
if info == nil {
return fmt.Errorf("no roomInfo found")
}
// get the users stateKeyNID
stateKeyNIDs, err := r.DB.EventStateKeyNIDs(ctx, []string{request.UserID})
if err != nil {
return fmt.Errorf("unable to get stateKeyNIDs for %s: %w", request.UserID, err)
}
if _, ok := stateKeyNIDs[request.UserID]; !ok {
return fmt.Errorf("requested stateKeyNID for %s was not found", request.UserID)
}
response.Membership, err = r.DB.GetMembershipForHistoryVisibility(ctx, stateKeyNIDs[request.UserID], info, request.EventIDs...)
switch err {
case nil:
return nil
case tables.OptimisationNotSupportedError: // fallthrough, slow way of getting the membership events for each event
default:
return err
}
response.Membership = make(map[string]*types.HeaderedEvent)
stateEntries, err := helpers.MembershipAtEvent(ctx, r.DB, nil, request.EventIDs, stateKeyNIDs[request.UserID])
if err != nil {
return fmt.Errorf("unable to get state before event: %w", err)
}
// If we only have one or less state entries, we can short circuit the below
// loop and avoid hitting the database
allStateEventNIDs := make(map[types.EventNID]types.StateEntry)
for _, eventID := range request.EventIDs {
stateEntry := stateEntries[eventID]
for _, s := range stateEntry {
allStateEventNIDs[s.EventNID] = s
}
}
var canShortCircuit bool
if len(allStateEventNIDs) <= 1 {
canShortCircuit = true
}
var memberships []types.Event
for _, eventID := range request.EventIDs {
stateEntry, ok := stateEntries[eventID]
if !ok || len(stateEntry) == 0 {
response.Membership[eventID] = nil
continue
}
// If we can short circuit, e.g. we only have 0 or 1 membership events, we only get the memberships
// once. If we have more than one membership event, we need to get the state for each state entry.
if canShortCircuit {
if len(memberships) == 0 {
memberships, err = helpers.GetMembershipsAtState(ctx, r.DB, info, stateEntry, false)
}
} else {
memberships, err = helpers.GetMembershipsAtState(ctx, r.DB, info, stateEntry, false)
}
if err != nil {
return fmt.Errorf("unable to get memberships at state: %w", err)
}
// Iterate over all membership events we got. Given we only query the membership for
// one user and assuming this user only ever has one membership event associated to
// a given event, overwrite any other existing membership events.
for i := range memberships {
ev := memberships[i]
if ev.Type() == spec.MRoomMember && ev.StateKeyEquals(request.UserID) {
response.Membership[eventID] = &types.HeaderedEvent{PDU: ev.PDU}
}
}
}
return nil
}
// QueryMembershipsForRoom implements api.RoomserverInternalAPI
func (r *Queryer) QueryMembershipsForRoom(
ctx context.Context,
request *api.QueryMembershipsForRoomRequest,
response *api.QueryMembershipsForRoomResponse,
) error {
info, err := r.DB.RoomInfo(ctx, request.RoomID)
if err != nil {
return err
}
if info == nil {
return nil
}
// If no sender is specified then we will just return the entire
// set of memberships for the room, regardless of whether a specific
// user is allowed to see them or not.
if request.Sender == "" {
var events []types.Event
var eventNIDs []types.EventNID
eventNIDs, err = r.DB.GetMembershipEventNIDsForRoom(ctx, info.RoomNID, request.JoinedOnly, request.LocalOnly)
if err != nil {
if err == sql.ErrNoRows {
return nil
}
return fmt.Errorf("r.DB.GetMembershipEventNIDsForRoom: %w", err)
}
events, err = r.DB.Events(ctx, info.RoomVersion, eventNIDs)
if err != nil {
return fmt.Errorf("r.DB.Events: %w", err)
}
for _, event := range events {
clientEvent := synctypes.ToClientEvent(event.PDU, synctypes.FormatAll)
response.JoinEvents = append(response.JoinEvents, clientEvent)
}
return nil
}
membershipEventNID, stillInRoom, isRoomforgotten, err := r.DB.GetMembership(ctx, info.RoomNID, request.Sender)
if err != nil {
return err
}
response.IsRoomForgotten = isRoomforgotten
if membershipEventNID == 0 {
response.HasBeenInRoom = false
response.JoinEvents = nil
return nil
}
response.HasBeenInRoom = true
response.JoinEvents = []synctypes.ClientEvent{}
var events []types.Event
var stateEntries []types.StateEntry
if stillInRoom {
var eventNIDs []types.EventNID
eventNIDs, err = r.DB.GetMembershipEventNIDsForRoom(ctx, info.RoomNID, request.JoinedOnly, false)
if err != nil {
if err == sql.ErrNoRows {
return nil
}
return err
}
events, err = r.DB.Events(ctx, info.RoomVersion, eventNIDs)
} else {
stateEntries, err = helpers.StateBeforeEvent(ctx, r.DB, info, membershipEventNID)
if err != nil {
logrus.WithField("membership_event_nid", membershipEventNID).WithError(err).Error("failed to load state before event")
return err
}
events, err = helpers.GetMembershipsAtState(ctx, r.DB, info, stateEntries, request.JoinedOnly)
}
if err != nil {
return err
}
for _, event := range events {
clientEvent := synctypes.ToClientEvent(event.PDU, synctypes.FormatAll)
response.JoinEvents = append(response.JoinEvents, clientEvent)
}
return nil
}
// QueryServerJoinedToRoom implements api.RoomserverInternalAPI
func (r *Queryer) QueryServerJoinedToRoom(
ctx context.Context,
request *api.QueryServerJoinedToRoomRequest,
response *api.QueryServerJoinedToRoomResponse,
) error {
info, err := r.DB.RoomInfo(ctx, request.RoomID)
if err != nil {
return fmt.Errorf("r.DB.RoomInfo: %w", err)
}
if info == nil || info.IsStub() {
return nil
}
response.RoomExists = true
if r.IsLocalServerName(request.ServerName) || request.ServerName == "" {
response.IsInRoom, err = r.DB.GetLocalServerInRoom(ctx, info.RoomNID)
if err != nil {
return fmt.Errorf("r.DB.GetLocalServerInRoom: %w", err)
}
} else {
response.IsInRoom, err = r.DB.GetServerInRoom(ctx, info.RoomNID, request.ServerName)
if err != nil {
return fmt.Errorf("r.DB.GetServerInRoom: %w", err)
}
}
return nil
}
// QueryServerAllowedToSeeEvent implements api.RoomserverInternalAPI
func (r *Queryer) QueryServerAllowedToSeeEvent(
ctx context.Context,
serverName spec.ServerName,
eventID string,
) (allowed bool, err error) {
events, err := r.DB.EventNIDs(ctx, []string{eventID})
if err != nil {
return
}
if len(events) == 0 {
return allowed, nil
}
info, err := r.DB.RoomInfoByNID(ctx, events[eventID].RoomNID)
if err != nil {
return allowed, err
}
if info == nil || info.IsStub() {
return allowed, nil
}
var isInRoom bool
if r.IsLocalServerName(serverName) || serverName == "" {
isInRoom, err = r.DB.GetLocalServerInRoom(ctx, info.RoomNID)
if err != nil {
return allowed, fmt.Errorf("r.DB.GetLocalServerInRoom: %w", err)
}
} else {
isInRoom, err = r.DB.GetServerInRoom(ctx, info.RoomNID, serverName)
if err != nil {
return allowed, fmt.Errorf("r.DB.GetServerInRoom: %w", err)
}
}
return helpers.CheckServerAllowedToSeeEvent(
ctx, r.DB, info, eventID, serverName, isInRoom,
)
}
// QueryMissingEvents implements api.RoomserverInternalAPI
func (r *Queryer) QueryMissingEvents(
ctx context.Context,
request *api.QueryMissingEventsRequest,
response *api.QueryMissingEventsResponse,
) error {
var front []string
eventsToFilter := make(map[string]bool, len(request.LatestEvents))
visited := make(map[string]bool, request.Limit) // request.Limit acts as a hint to size.
for _, id := range request.EarliestEvents {
visited[id] = true
}
for _, id := range request.LatestEvents {
if !visited[id] {
front = append(front, id)
eventsToFilter[id] = true
}
}
if len(front) == 0 {
return nil // no events to query, give up.
}
events, err := r.DB.EventNIDs(ctx, []string{front[0]})
if err != nil {
return err
}
if len(events) == 0 {
return nil // we are missing the events being asked to search from, give up.
}
info, err := r.DB.RoomInfoByNID(ctx, events[front[0]].RoomNID)
if err != nil {
return err
}
if info == nil || info.IsStub() {
return fmt.Errorf("missing RoomInfo for room %d", events[front[0]].RoomNID)
}
resultNIDs, redactEventIDs, err := helpers.ScanEventTree(ctx, r.DB, info, front, visited, request.Limit, request.ServerName)
if err != nil {
return err
}
loadedEvents, err := helpers.LoadEvents(ctx, r.DB, info, resultNIDs)
if err != nil {
return err
}
response.Events = make([]*types.HeaderedEvent, 0, len(loadedEvents)-len(eventsToFilter))
for _, event := range loadedEvents {
if !eventsToFilter[event.EventID()] {
if _, ok := redactEventIDs[event.EventID()]; ok {
event.Redact()
}
response.Events = append(response.Events, &types.HeaderedEvent{PDU: event})
}
}
return err
}
// QueryStateAndAuthChain implements api.RoomserverInternalAPI
func (r *Queryer) QueryStateAndAuthChain(
ctx context.Context,
request *api.QueryStateAndAuthChainRequest,
response *api.QueryStateAndAuthChainResponse,
) error {
info, err := r.DB.RoomInfo(ctx, request.RoomID)
if err != nil {
return err
}
if info == nil || info.IsStub() {
return nil
}
response.RoomExists = true
response.RoomVersion = info.RoomVersion
// handle this entirely separately to the other case so we don't have to pull out
// the entire current state of the room
// TODO: this probably means it should be a different query operation...
if request.OnlyFetchAuthChain {
var authEvents []gomatrixserverlib.PDU
authEvents, err = GetAuthChain(ctx, r.DB.EventsFromIDs, info, request.AuthEventIDs)
if err != nil {
return err
}
for _, event := range authEvents {
response.AuthChainEvents = append(response.AuthChainEvents, &types.HeaderedEvent{PDU: event})
}
return nil
}
var stateEvents []gomatrixserverlib.PDU
stateEvents, rejected, stateMissing, err := r.loadStateAtEventIDs(ctx, info, request.PrevEventIDs)
if err != nil {
return err
}
response.StateKnown = !stateMissing
response.IsRejected = rejected
response.PrevEventsExist = true
// add the auth event IDs for the current state events too
var authEventIDs []string
authEventIDs = append(authEventIDs, request.AuthEventIDs...)
for _, se := range stateEvents {
authEventIDs = append(authEventIDs, se.AuthEventIDs()...)
}
authEventIDs = util.UniqueStrings(authEventIDs) // de-dupe
authEvents, err := GetAuthChain(ctx, r.DB.EventsFromIDs, info, authEventIDs)
if err != nil {
return err
}
if request.ResolveState {
stateEvents, err = gomatrixserverlib.ResolveConflicts(
info.RoomVersion, gomatrixserverlib.ToPDUs(stateEvents), gomatrixserverlib.ToPDUs(authEvents),
)
if err != nil {
return err
}
}
for _, event := range stateEvents {
response.StateEvents = append(response.StateEvents, &types.HeaderedEvent{PDU: event})
}
for _, event := range authEvents {
response.AuthChainEvents = append(response.AuthChainEvents, &types.HeaderedEvent{PDU: event})
}
return err
}
// first bool: is rejected, second bool: state missing
func (r *Queryer) loadStateAtEventIDs(ctx context.Context, roomInfo *types.RoomInfo, eventIDs []string) ([]gomatrixserverlib.PDU, bool, bool, error) {
roomState := state.NewStateResolution(r.DB, roomInfo)
prevStates, err := r.DB.StateAtEventIDs(ctx, eventIDs)
if err != nil {
switch err.(type) {
case types.MissingEventError:
return nil, false, true, nil
case types.MissingStateError:
return nil, false, true, nil
default:
return nil, false, false, err
}
}
// Currently only used on /state and /state_ids
rejected := false
for i := range prevStates {
if prevStates[i].IsRejected {
rejected = true
break
}
}
// Look up the currrent state for the requested tuples.
stateEntries, err := roomState.LoadCombinedStateAfterEvents(
ctx, prevStates,
)
if err != nil {
return nil, rejected, false, err
}
events, err := helpers.LoadStateEvents(ctx, r.DB, roomInfo, stateEntries)
return events, rejected, false, err
}
type eventsFromIDs func(context.Context, *types.RoomInfo, []string) ([]types.Event, error)
// GetAuthChain fetches the auth chain for the given auth events. An auth chain
// is the list of all events that are referenced in the auth_events section, and
// all their auth_events, recursively. The returned set of events contain the
// given events. Will *not* error if we don't have all auth events.
func GetAuthChain(
ctx context.Context, fn eventsFromIDs, roomInfo *types.RoomInfo, authEventIDs []string,
) ([]gomatrixserverlib.PDU, error) {
// List of event IDs to fetch. On each pass, these events will be requested
// from the database and the `eventsToFetch` will be updated with any new
// events that we have learned about and need to find. When `eventsToFetch`
// is eventually empty, we should have reached the end of the chain.
eventsToFetch := authEventIDs
authEventsMap := make(map[string]gomatrixserverlib.PDU)
for len(eventsToFetch) > 0 {
// Try to retrieve the events from the database.
events, err := fn(ctx, roomInfo, eventsToFetch)
if err != nil {
return nil, err
}
// We've now fetched these events so clear out `eventsToFetch`. Soon we may
// add newly discovered events to this for the next pass.
eventsToFetch = eventsToFetch[:0]
for _, event := range events {
// Store the event in the event map - this prevents us from requesting it
// from the database again.
authEventsMap[event.EventID()] = event.PDU
// Extract all of the auth events from the newly obtained event. If we
// don't already have a record of the event, record it in the list of
// events we want to request for the next pass.
for _, authEventID := range event.AuthEventIDs() {
if _, ok := authEventsMap[authEventID]; !ok {
eventsToFetch = append(eventsToFetch, authEventID)
}
}
}
}
// We've now retrieved all of the events we can. Flatten them down into an
// array and return them.
var authEvents []gomatrixserverlib.PDU
for _, event := range authEventsMap {
authEvents = append(authEvents, event)
}
return authEvents, nil
}
// QueryRoomVersionForRoom implements api.RoomserverInternalAPI
func (r *Queryer) QueryRoomVersionForRoom(ctx context.Context, roomID string) (gomatrixserverlib.RoomVersion, error) {
if roomVersion, ok := r.Cache.GetRoomVersion(roomID); ok {
return roomVersion, nil
}
info, err := r.DB.RoomInfo(ctx, roomID)
if err != nil {
return "", err
}
if info == nil {
return "", fmt.Errorf("QueryRoomVersionForRoom: missing room info for room %s", roomID)
}
r.Cache.StoreRoomVersion(roomID, info.RoomVersion)
return info.RoomVersion, nil
}
func (r *Queryer) QueryPublishedRooms(
ctx context.Context,
req *api.QueryPublishedRoomsRequest,
res *api.QueryPublishedRoomsResponse,
) error {
if req.RoomID != "" {
visible, err := r.DB.GetPublishedRoom(ctx, req.RoomID)
if err == nil && visible {
res.RoomIDs = []string{req.RoomID}
return nil
}
return err
}
rooms, err := r.DB.GetPublishedRooms(ctx, req.NetworkID, req.IncludeAllNetworks)
if err != nil {
return err
}
res.RoomIDs = rooms
return nil
}
func (r *Queryer) QueryCurrentState(ctx context.Context, req *api.QueryCurrentStateRequest, res *api.QueryCurrentStateResponse) error {
res.StateEvents = make(map[gomatrixserverlib.StateKeyTuple]*types.HeaderedEvent)
for _, tuple := range req.StateTuples {
if tuple.StateKey == "*" && req.AllowWildcards {
events, err := r.DB.GetStateEventsWithEventType(ctx, req.RoomID, tuple.EventType)
if err != nil {
return err
}
for _, e := range events {
res.StateEvents[gomatrixserverlib.StateKeyTuple{
EventType: e.Type(),
StateKey: *e.StateKey(),
}] = e
}
} else {
ev, err := r.DB.GetStateEvent(ctx, req.RoomID, tuple.EventType, tuple.StateKey)
if err != nil {
return err
}
if ev != nil {
res.StateEvents[tuple] = ev
}
}
}
return nil
}
func (r *Queryer) QueryRoomsForUser(ctx context.Context, req *api.QueryRoomsForUserRequest, res *api.QueryRoomsForUserResponse) error {
roomIDs, err := r.DB.GetRoomsByMembership(ctx, req.UserID, req.WantMembership)
if err != nil {
return err
}
res.RoomIDs = roomIDs
return nil
}
func (r *Queryer) QueryKnownUsers(ctx context.Context, req *api.QueryKnownUsersRequest, res *api.QueryKnownUsersResponse) error {
users, err := r.DB.GetKnownUsers(ctx, req.UserID, req.SearchString, req.Limit)
if err != nil && err != sql.ErrNoRows {
return err
}
for _, user := range users {
res.Users = append(res.Users, authtypes.FullyQualifiedProfile{
UserID: user,
})
}
return nil
}
func (r *Queryer) QueryBulkStateContent(ctx context.Context, req *api.QueryBulkStateContentRequest, res *api.QueryBulkStateContentResponse) error {
events, err := r.DB.GetBulkStateContent(ctx, req.RoomIDs, req.StateTuples, req.AllowWildcards)
if err != nil {
return err
}
res.Rooms = make(map[string]map[gomatrixserverlib.StateKeyTuple]string)
for _, ev := range events {
if res.Rooms[ev.RoomID] == nil {
res.Rooms[ev.RoomID] = make(map[gomatrixserverlib.StateKeyTuple]string)
}
room := res.Rooms[ev.RoomID]
room[gomatrixserverlib.StateKeyTuple{
EventType: ev.EventType,
StateKey: ev.StateKey,
}] = ev.ContentValue
res.Rooms[ev.RoomID] = room
}
return nil
}
func (r *Queryer) QueryLeftUsers(ctx context.Context, req *api.QueryLeftUsersRequest, res *api.QueryLeftUsersResponse) error {
var err error
res.LeftUsers, err = r.DB.GetLeftUsers(ctx, req.StaleDeviceListUsers)
return err
}
func (r *Queryer) QuerySharedUsers(ctx context.Context, req *api.QuerySharedUsersRequest, res *api.QuerySharedUsersResponse) error {
roomIDs, err := r.DB.GetRoomsByMembership(ctx, req.UserID, "join")
if err != nil {
return err
}
roomIDs = append(roomIDs, req.IncludeRoomIDs...)
excludeMap := make(map[string]bool)
for _, roomID := range req.ExcludeRoomIDs {
excludeMap[roomID] = true
}
// filter out excluded rooms
j := 0
for i := range roomIDs {
// move elements to include to the beginning of the slice
// then trim elements on the right
if !excludeMap[roomIDs[i]] {
roomIDs[j] = roomIDs[i]
j++
}
}
roomIDs = roomIDs[:j]
users, err := r.DB.JoinedUsersSetInRooms(ctx, roomIDs, req.OtherUserIDs, req.LocalOnly)
if err != nil {
return err
}
res.UserIDsToCount = users
return nil
}
func (r *Queryer) QueryServerBannedFromRoom(ctx context.Context, req *api.QueryServerBannedFromRoomRequest, res *api.QueryServerBannedFromRoomResponse) error {
if r.ServerACLs == nil {
return errors.New("no server ACL tracking")
}
res.Banned = r.ServerACLs.IsServerBannedFromRoom(req.ServerName, req.RoomID)
return nil
}
func (r *Queryer) QueryAuthChain(ctx context.Context, req *api.QueryAuthChainRequest, res *api.QueryAuthChainResponse) error {
chain, err := GetAuthChain(ctx, r.DB.EventsFromIDs, nil, req.EventIDs)
if err != nil {
return err
}
hchain := make([]*types.HeaderedEvent, len(chain))
for i := range chain {
hchain[i] = &types.HeaderedEvent{PDU: chain[i]}
}
res.AuthChain = hchain
return nil
}
// nolint:gocyclo
func (r *Queryer) QueryRestrictedJoinAllowed(ctx context.Context, req *api.QueryRestrictedJoinAllowedRequest, res *api.QueryRestrictedJoinAllowedResponse) error {
// Look up if we know anything about the room. If it doesn't exist
// or is a stub entry then we can't do anything.
roomInfo, err := r.DB.RoomInfo(ctx, req.RoomID)
if err != nil {
return fmt.Errorf("r.DB.RoomInfo: %w", err)
}
if roomInfo == nil || roomInfo.IsStub() {
return nil // fmt.Errorf("room %q doesn't exist or is stub room", req.RoomID)
}
verImpl, err := gomatrixserverlib.GetRoomVersion(roomInfo.RoomVersion)
if err != nil {
return err
}
// If the room version doesn't allow restricted joins then don't
// try to process any further.
allowRestrictedJoins := verImpl.MayAllowRestrictedJoinsInEventAuth()
if !allowRestrictedJoins {
return nil
}
// Start off by populating the "resident" flag in the response. If we
// come across any rooms in the request that are missing, we will unset
// the flag.
res.Resident = true
// Get the join rules to work out if the join rule is "restricted".
joinRulesEvent, err := r.DB.GetStateEvent(ctx, req.RoomID, spec.MRoomJoinRules, "")
if err != nil {
return fmt.Errorf("r.DB.GetStateEvent: %w", err)
}
if joinRulesEvent == nil {
return nil
}
var joinRules gomatrixserverlib.JoinRuleContent
if err = json.Unmarshal(joinRulesEvent.Content(), &joinRules); err != nil {
return fmt.Errorf("json.Unmarshal: %w", err)
}
// If the join rule isn't "restricted" or "knock_restricted" then there's nothing more to do.
res.Restricted = joinRules.JoinRule == spec.Restricted || joinRules.JoinRule == spec.KnockRestricted
if !res.Restricted {
return nil
}
// If the user is already invited to the room then the join is allowed
// but we don't specify an authorised via user, since the event auth
// will allow the join anyway.
var pending bool
if pending, _, _, _, err = helpers.IsInvitePending(ctx, r.DB, req.RoomID, req.UserID); err != nil {
return fmt.Errorf("helpers.IsInvitePending: %w", err)
} else if pending {
res.Allowed = true
return nil
}
// We need to get the power levels content so that we can determine which
// users in the room are entitled to issue invites. We need to use one of
// these users as the authorising user.
powerLevelsEvent, err := r.DB.GetStateEvent(ctx, req.RoomID, spec.MRoomPowerLevels, "")
if err != nil {
return fmt.Errorf("r.DB.GetStateEvent: %w", err)
}
powerLevels, err := powerLevelsEvent.PowerLevels()
if err != nil {
return fmt.Errorf("unable to get powerlevels: %w", err)
}
// Step through the join rules and see if the user matches any of them.
for _, rule := range joinRules.Allow {
// We only understand "m.room_membership" rules at this point in
// time, so skip any rule that doesn't match those.
if rule.Type != spec.MRoomMembership {
continue
}
// See if the room exists. If it doesn't exist or if it's a stub
// room entry then we can't check memberships.
targetRoomInfo, err := r.DB.RoomInfo(ctx, rule.RoomID)
if err != nil || targetRoomInfo == nil || targetRoomInfo.IsStub() {
res.Resident = false
continue
}
// First of all work out if *we* are still in the room, otherwise
// it's possible that the memberships will be out of date.
isIn, err := r.DB.GetLocalServerInRoom(ctx, targetRoomInfo.RoomNID)
if err != nil || !isIn {
// If we aren't in the room, we can no longer tell if the room
// memberships are up-to-date.
res.Resident = false
continue
}
// At this point we're happy that we are in the room, so now let's
// see if the target user is in the room.
_, isIn, _, err = r.DB.GetMembership(ctx, targetRoomInfo.RoomNID, req.UserID)
if err != nil {
continue
}
// If the user is not in the room then we will skip them.
if !isIn {
continue
}
// The user is in the room, so now we will need to authorise the
// join using the user ID of one of our own users in the room. Pick
// one.
joinNIDs, err := r.DB.GetMembershipEventNIDsForRoom(ctx, targetRoomInfo.RoomNID, true, true)
if err != nil || len(joinNIDs) == 0 {
// There should always be more than one join NID at this point
// because we are gated behind GetLocalServerInRoom, but y'know,
// sometimes strange things happen.
continue
}
// For each of the joined users, let's see if we can get a valid
// membership event.
for _, joinNID := range joinNIDs {
events, err := r.DB.Events(ctx, roomInfo.RoomVersion, []types.EventNID{joinNID})
if err != nil || len(events) != 1 {
continue
}
event := events[0]
if event.Type() != spec.MRoomMember || event.StateKey() == nil {
continue // shouldn't happen
}
// Only users that have the power to invite should be chosen.
if powerLevels.UserLevel(*event.StateKey()) < powerLevels.Invite {
continue
}
res.Resident = true
res.Allowed = true
res.AuthorisedVia = *event.StateKey()
return nil
}
}
return nil
}