mirror of
https://github.com/matrix-org/dendrite
synced 2024-11-19 08:10:57 +01:00
530 lines
19 KiB
Go
530 lines
19 KiB
Go
// Copyright 2023 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package query
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import (
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"context"
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"encoding/json"
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"fmt"
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"sort"
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fs "github.com/matrix-org/dendrite/federationapi/api"
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roomserver "github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/roomserver/types"
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userapi "github.com/matrix-org/dendrite/userapi/api"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/gomatrixserverlib/fclient"
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"github.com/matrix-org/gomatrixserverlib/spec"
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"github.com/matrix-org/util"
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"github.com/tidwall/gjson"
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)
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// Traverse the room hierarchy using the provided walker up to the provided limit,
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// returning a new walker which can be used to fetch the next page.
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//
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// If limit is -1, this is treated as no limit, and the entire hierarchy will be traversed.
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//
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// If returned walker is nil, then there are no more rooms left to traverse. This method does not modify the provided walker, so it
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// can be cached.
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func (querier *Queryer) QueryNextRoomHierarchyPage(ctx context.Context, walker roomserver.RoomHierarchyWalker, limit int) ([]fclient.RoomHierarchyRoom, *roomserver.RoomHierarchyWalker, error) {
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if authorised, _ := authorised(ctx, querier, walker.Caller, walker.RootRoomID, nil); !authorised {
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return nil, nil, roomserver.ErrRoomUnknownOrNotAllowed{Err: fmt.Errorf("room is unknown/forbidden")}
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}
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discoveredRooms := []fclient.RoomHierarchyRoom{}
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// Copy unvisited and processed to avoid modifying original walker (which is typically in cache)
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unvisited := make([]roomserver.RoomHierarchyWalkerQueuedRoom, len(walker.Unvisited))
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copy(unvisited, walker.Unvisited)
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processed := walker.Processed.Copy()
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// Depth first -> stack data structure
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for len(unvisited) > 0 {
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if len(discoveredRooms) >= limit && limit != -1 {
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break
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}
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// pop the stack
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queuedRoom := unvisited[len(unvisited)-1]
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unvisited = unvisited[:len(unvisited)-1]
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// If this room has already been processed, skip.
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// If this room exceeds the specified depth, skip.
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if processed.Contains(queuedRoom.RoomID) || (walker.MaxDepth > 0 && queuedRoom.Depth > walker.MaxDepth) {
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continue
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}
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// Mark this room as processed.
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processed.Add(queuedRoom.RoomID)
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// if this room is not a space room, skip.
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var roomType string
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create := stateEvent(ctx, querier, queuedRoom.RoomID, spec.MRoomCreate, "")
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if create != nil {
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var createContent gomatrixserverlib.CreateContent
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err := json.Unmarshal(create.Content(), &createContent)
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if err != nil {
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util.GetLogger(ctx).WithError(err).WithField("create_content", create.Content()).Warn("failed to unmarshal m.room.create event")
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}
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roomType = createContent.RoomType
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}
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// Collect rooms/events to send back (either locally or fetched via federation)
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var discoveredChildEvents []fclient.RoomHierarchyStrippedEvent
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// If we know about this room and the caller is authorised (joined/world_readable) then pull
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// events locally
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roomExists := roomExists(ctx, querier, queuedRoom.RoomID)
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if !roomExists {
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// attempt to query this room over federation, as either we've never heard of it before
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// or we've left it and hence are not authorised (but info may be exposed regardless)
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fedRes := federatedRoomInfo(ctx, querier, walker.Caller, walker.SuggestedOnly, queuedRoom.RoomID, queuedRoom.Vias)
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if fedRes != nil {
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discoveredChildEvents = fedRes.Room.ChildrenState
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discoveredRooms = append(discoveredRooms, fedRes.Room)
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if len(fedRes.Children) > 0 {
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discoveredRooms = append(discoveredRooms, fedRes.Children...)
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}
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// mark this room as a space room as the federated server responded.
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// we need to do this so we add the children of this room to the unvisited stack
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// as these children may be rooms we do know about.
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roomType = spec.MSpace
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}
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} else if authorised, isJoinedOrInvited := authorised(ctx, querier, walker.Caller, queuedRoom.RoomID, queuedRoom.ParentRoomID); authorised {
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// Get all `m.space.child` state events for this room
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events, err := childReferences(ctx, querier, walker.SuggestedOnly, queuedRoom.RoomID)
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if err != nil {
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util.GetLogger(ctx).WithError(err).WithField("room_id", queuedRoom.RoomID).Error("failed to extract references for room")
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continue
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}
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discoveredChildEvents = events
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pubRoom := publicRoomsChunk(ctx, querier, queuedRoom.RoomID)
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discoveredRooms = append(discoveredRooms, fclient.RoomHierarchyRoom{
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PublicRoom: *pubRoom,
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RoomType: roomType,
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ChildrenState: events,
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})
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// don't walk children if the user is not joined/invited to the space
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if !isJoinedOrInvited {
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continue
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}
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} else {
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// room exists but user is not authorised
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continue
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}
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// don't walk the children
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// if the parent is not a space room
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if roomType != spec.MSpace {
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continue
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}
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// For each referenced room ID in the child events being returned to the caller
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// add the room ID to the queue of unvisited rooms. Loop from the beginning.
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// We need to invert the order here because the child events are lo->hi on the timestamp,
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// so we need to ensure we pop in the same lo->hi order, which won't be the case if we
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// insert the highest timestamp last in a stack.
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for i := len(discoveredChildEvents) - 1; i >= 0; i-- {
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spaceContent := struct {
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Via []string `json:"via"`
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}{}
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ev := discoveredChildEvents[i]
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_ = json.Unmarshal(ev.Content, &spaceContent)
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childRoomID, err := spec.NewRoomID(ev.StateKey)
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if err != nil {
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util.GetLogger(ctx).WithError(err).WithField("invalid_room_id", ev.StateKey).WithField("parent_room_id", queuedRoom.RoomID).Warn("Invalid room ID in m.space.child state event")
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} else {
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unvisited = append(unvisited, roomserver.RoomHierarchyWalkerQueuedRoom{
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RoomID: *childRoomID,
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ParentRoomID: &queuedRoom.RoomID,
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Depth: queuedRoom.Depth + 1,
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Vias: spaceContent.Via,
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})
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}
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}
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}
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if len(unvisited) == 0 {
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// If no more rooms to walk, then don't return a walker for future pages
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return discoveredRooms, nil, nil
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} else {
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// If there are more rooms to walk, then return a new walker to resume walking from (for querying more pages)
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newWalker := roomserver.RoomHierarchyWalker{
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RootRoomID: walker.RootRoomID,
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Caller: walker.Caller,
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SuggestedOnly: walker.SuggestedOnly,
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MaxDepth: walker.MaxDepth,
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Unvisited: unvisited,
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Processed: processed,
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}
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return discoveredRooms, &newWalker, nil
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}
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}
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// authorised returns true iff the user is joined this room or the room is world_readable
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func authorised(ctx context.Context, querier *Queryer, caller types.DeviceOrServerName, roomID spec.RoomID, parentRoomID *spec.RoomID) (authed, isJoinedOrInvited bool) {
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if clientCaller := caller.Device(); clientCaller != nil {
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return authorisedUser(ctx, querier, clientCaller, roomID, parentRoomID)
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} else {
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return authorisedServer(ctx, querier, roomID, *caller.ServerName()), false
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}
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}
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// authorisedServer returns true iff the server is joined this room or the room is world_readable, public, or knockable
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func authorisedServer(ctx context.Context, querier *Queryer, roomID spec.RoomID, callerServerName spec.ServerName) bool {
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// Check history visibility / join rules first
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hisVisTuple := gomatrixserverlib.StateKeyTuple{
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EventType: spec.MRoomHistoryVisibility,
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StateKey: "",
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}
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joinRuleTuple := gomatrixserverlib.StateKeyTuple{
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EventType: spec.MRoomJoinRules,
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StateKey: "",
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}
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var queryRoomRes roomserver.QueryCurrentStateResponse
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err := querier.QueryCurrentState(ctx, &roomserver.QueryCurrentStateRequest{
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RoomID: roomID.String(),
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StateTuples: []gomatrixserverlib.StateKeyTuple{
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hisVisTuple, joinRuleTuple,
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},
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}, &queryRoomRes)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Error("failed to QueryCurrentState")
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return false
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}
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hisVisEv := queryRoomRes.StateEvents[hisVisTuple]
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if hisVisEv != nil {
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hisVis, _ := hisVisEv.HistoryVisibility()
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if hisVis == "world_readable" {
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return true
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}
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}
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// check if this room is a restricted room and if so, we need to check if the server is joined to an allowed room ID
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// in addition to the actual room ID (but always do the actual one first as it's quicker in the common case)
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allowJoinedToRoomIDs := []spec.RoomID{roomID}
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joinRuleEv := queryRoomRes.StateEvents[joinRuleTuple]
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if joinRuleEv != nil {
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rule, ruleErr := joinRuleEv.JoinRule()
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if ruleErr != nil {
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util.GetLogger(ctx).WithError(ruleErr).WithField("parent_room_id", roomID).Warn("failed to get join rule")
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return false
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}
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if rule == spec.Public || rule == spec.Knock {
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return true
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}
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if rule == spec.Restricted {
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allowJoinedToRoomIDs = append(allowJoinedToRoomIDs, restrictedJoinRuleAllowedRooms(ctx, joinRuleEv)...)
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}
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}
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// check if server is joined to any allowed room
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for _, allowedRoomID := range allowJoinedToRoomIDs {
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var queryRes fs.QueryJoinedHostServerNamesInRoomResponse
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err = querier.FSAPI.QueryJoinedHostServerNamesInRoom(ctx, &fs.QueryJoinedHostServerNamesInRoomRequest{
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RoomID: allowedRoomID.String(),
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}, &queryRes)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Error("failed to QueryJoinedHostServerNamesInRoom")
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continue
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}
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for _, srv := range queryRes.ServerNames {
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if srv == callerServerName {
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return true
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}
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}
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}
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return false
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}
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// authorisedUser returns true iff the user is invited/joined this room or the room is world_readable
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// or if the room has a public or knock join rule.
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// Failing that, if the room has a restricted join rule and belongs to the space parent listed, it will return true.
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func authorisedUser(ctx context.Context, querier *Queryer, clientCaller *userapi.Device, roomID spec.RoomID, parentRoomID *spec.RoomID) (authed bool, isJoinedOrInvited bool) {
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hisVisTuple := gomatrixserverlib.StateKeyTuple{
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EventType: spec.MRoomHistoryVisibility,
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StateKey: "",
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}
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joinRuleTuple := gomatrixserverlib.StateKeyTuple{
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EventType: spec.MRoomJoinRules,
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StateKey: "",
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}
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roomMemberTuple := gomatrixserverlib.StateKeyTuple{
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EventType: spec.MRoomMember,
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StateKey: clientCaller.UserID,
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}
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var queryRes roomserver.QueryCurrentStateResponse
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err := querier.QueryCurrentState(ctx, &roomserver.QueryCurrentStateRequest{
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RoomID: roomID.String(),
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StateTuples: []gomatrixserverlib.StateKeyTuple{
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hisVisTuple, joinRuleTuple, roomMemberTuple,
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},
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}, &queryRes)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Error("failed to QueryCurrentState")
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return false, false
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}
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memberEv := queryRes.StateEvents[roomMemberTuple]
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if memberEv != nil {
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membership, _ := memberEv.Membership()
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if membership == spec.Join || membership == spec.Invite {
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return true, true
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}
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}
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hisVisEv := queryRes.StateEvents[hisVisTuple]
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if hisVisEv != nil {
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hisVis, _ := hisVisEv.HistoryVisibility()
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if hisVis == "world_readable" {
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return true, false
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}
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}
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joinRuleEv := queryRes.StateEvents[joinRuleTuple]
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if parentRoomID != nil && joinRuleEv != nil {
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var allowed bool
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rule, ruleErr := joinRuleEv.JoinRule()
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if ruleErr != nil {
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util.GetLogger(ctx).WithError(ruleErr).WithField("parent_room_id", parentRoomID).Warn("failed to get join rule")
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} else if rule == spec.Public || rule == spec.Knock {
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allowed = true
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} else if rule == spec.Restricted {
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allowedRoomIDs := restrictedJoinRuleAllowedRooms(ctx, joinRuleEv)
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// check parent is in the allowed set
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for _, a := range allowedRoomIDs {
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if *parentRoomID == a {
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allowed = true
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break
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}
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}
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}
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if allowed {
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// ensure caller is joined to the parent room
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var queryRes2 roomserver.QueryCurrentStateResponse
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err = querier.QueryCurrentState(ctx, &roomserver.QueryCurrentStateRequest{
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RoomID: parentRoomID.String(),
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StateTuples: []gomatrixserverlib.StateKeyTuple{
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roomMemberTuple,
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},
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}, &queryRes2)
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if err != nil {
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util.GetLogger(ctx).WithError(err).WithField("parent_room_id", parentRoomID).Warn("failed to check user is joined to parent room")
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} else {
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memberEv = queryRes2.StateEvents[roomMemberTuple]
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if memberEv != nil {
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membership, _ := memberEv.Membership()
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if membership == spec.Join {
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return true, false
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}
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}
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}
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}
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}
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return false, false
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}
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// helper function to fetch a state event
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func stateEvent(ctx context.Context, querier *Queryer, roomID spec.RoomID, evType, stateKey string) *types.HeaderedEvent {
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var queryRes roomserver.QueryCurrentStateResponse
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tuple := gomatrixserverlib.StateKeyTuple{
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EventType: evType,
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StateKey: stateKey,
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}
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err := querier.QueryCurrentState(ctx, &roomserver.QueryCurrentStateRequest{
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RoomID: roomID.String(),
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StateTuples: []gomatrixserverlib.StateKeyTuple{tuple},
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}, &queryRes)
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if err != nil {
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return nil
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}
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return queryRes.StateEvents[tuple]
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}
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// returns true if the current server is participating in the provided room
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func roomExists(ctx context.Context, querier *Queryer, roomID spec.RoomID) bool {
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var queryRes roomserver.QueryServerJoinedToRoomResponse
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err := querier.QueryServerJoinedToRoom(ctx, &roomserver.QueryServerJoinedToRoomRequest{
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RoomID: roomID.String(),
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ServerName: querier.Cfg.Global.ServerName,
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}, &queryRes)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Error("failed to QueryServerJoinedToRoom")
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return false
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}
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// if the room exists but we aren't in the room then we might have stale data so we want to fetch
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// it fresh via federation
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return queryRes.RoomExists && queryRes.IsInRoom
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}
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// federatedRoomInfo returns more of the spaces graph from another server. Returns nil if this was
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// unsuccessful.
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func federatedRoomInfo(ctx context.Context, querier *Queryer, caller types.DeviceOrServerName, suggestedOnly bool, roomID spec.RoomID, vias []string) *fclient.RoomHierarchyResponse {
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// only do federated requests for client requests
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if caller.Device() == nil {
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return nil
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}
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resp, ok := querier.Cache.GetRoomHierarchy(roomID.String())
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if ok {
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util.GetLogger(ctx).Debugf("Returning cached response for %s", roomID)
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return &resp
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}
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util.GetLogger(ctx).Debugf("Querying %s via %+v", roomID, vias)
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innerCtx := context.Background()
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// query more of the spaces graph using these servers
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for _, serverName := range vias {
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if serverName == string(querier.Cfg.Global.ServerName) {
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continue
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}
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res, err := querier.FSAPI.RoomHierarchies(innerCtx, querier.Cfg.Global.ServerName, spec.ServerName(serverName), roomID.String(), suggestedOnly)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Warnf("failed to call RoomHierarchies on server %s", serverName)
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continue
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}
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// ensure nil slices are empty as we send this to the client sometimes
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if res.Room.ChildrenState == nil {
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res.Room.ChildrenState = []fclient.RoomHierarchyStrippedEvent{}
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}
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for i := 0; i < len(res.Children); i++ {
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child := res.Children[i]
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if child.ChildrenState == nil {
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child.ChildrenState = []fclient.RoomHierarchyStrippedEvent{}
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}
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res.Children[i] = child
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}
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querier.Cache.StoreRoomHierarchy(roomID.String(), res)
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return &res
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}
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return nil
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}
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// references returns all child references pointing to or from this room.
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func childReferences(ctx context.Context, querier *Queryer, suggestedOnly bool, roomID spec.RoomID) ([]fclient.RoomHierarchyStrippedEvent, error) {
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createTuple := gomatrixserverlib.StateKeyTuple{
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EventType: spec.MRoomCreate,
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StateKey: "",
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}
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var res roomserver.QueryCurrentStateResponse
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err := querier.QueryCurrentState(context.Background(), &roomserver.QueryCurrentStateRequest{
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RoomID: roomID.String(),
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AllowWildcards: true,
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StateTuples: []gomatrixserverlib.StateKeyTuple{
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createTuple, {
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EventType: spec.MSpaceChild,
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StateKey: "*",
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},
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},
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}, &res)
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if err != nil {
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return nil, err
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}
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// don't return any child refs if the room is not a space room
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if create := res.StateEvents[createTuple]; create != nil {
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var createContent gomatrixserverlib.CreateContent
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err := json.Unmarshal(create.Content(), &createContent)
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if err != nil {
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util.GetLogger(ctx).WithError(err).WithField("create_content", create.Content()).Warn("failed to unmarshal m.room.create event")
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}
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roomType := createContent.RoomType
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if roomType != spec.MSpace {
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return []fclient.RoomHierarchyStrippedEvent{}, nil
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}
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}
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delete(res.StateEvents, createTuple)
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el := make([]fclient.RoomHierarchyStrippedEvent, 0, len(res.StateEvents))
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for _, ev := range res.StateEvents {
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content := gjson.ParseBytes(ev.Content())
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// only return events that have a `via` key as per MSC1772
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// else we'll incorrectly walk redacted events (as the link
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// is in the state_key)
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if content.Get("via").Exists() {
|
|
strip := stripped(ev.PDU)
|
|
if strip == nil {
|
|
continue
|
|
}
|
|
// if suggested only and this child isn't suggested, skip it.
|
|
// if suggested only = false we include everything so don't need to check the content.
|
|
if suggestedOnly && !content.Get("suggested").Bool() {
|
|
continue
|
|
}
|
|
el = append(el, *strip)
|
|
}
|
|
}
|
|
// sort by origin_server_ts as per MSC2946
|
|
sort.Slice(el, func(i, j int) bool {
|
|
return el[i].OriginServerTS < el[j].OriginServerTS
|
|
})
|
|
|
|
return el, nil
|
|
}
|
|
|
|
// fetch public room information for provided room
|
|
func publicRoomsChunk(ctx context.Context, querier *Queryer, roomID spec.RoomID) *fclient.PublicRoom {
|
|
pubRooms, err := roomserver.PopulatePublicRooms(ctx, []string{roomID.String()}, querier)
|
|
if err != nil {
|
|
util.GetLogger(ctx).WithError(err).Error("failed to PopulatePublicRooms")
|
|
return nil
|
|
}
|
|
if len(pubRooms) == 0 {
|
|
return nil
|
|
}
|
|
return &pubRooms[0]
|
|
}
|
|
|
|
func stripped(ev gomatrixserverlib.PDU) *fclient.RoomHierarchyStrippedEvent {
|
|
if ev.StateKey() == nil {
|
|
return nil
|
|
}
|
|
return &fclient.RoomHierarchyStrippedEvent{
|
|
Type: ev.Type(),
|
|
StateKey: *ev.StateKey(),
|
|
Content: ev.Content(),
|
|
Sender: string(ev.SenderID()),
|
|
OriginServerTS: ev.OriginServerTS(),
|
|
}
|
|
}
|
|
|
|
// given join_rule event, return list of rooms where membership of that room allows joining.
|
|
func restrictedJoinRuleAllowedRooms(ctx context.Context, joinRuleEv *types.HeaderedEvent) (allows []spec.RoomID) {
|
|
rule, _ := joinRuleEv.JoinRule()
|
|
if rule != spec.Restricted {
|
|
return nil
|
|
}
|
|
var jrContent gomatrixserverlib.JoinRuleContent
|
|
if err := json.Unmarshal(joinRuleEv.Content(), &jrContent); err != nil {
|
|
util.GetLogger(ctx).Warnf("failed to check join_rule on room %s: %s", joinRuleEv.RoomID().String(), err)
|
|
return nil
|
|
}
|
|
for _, allow := range jrContent.Allow {
|
|
if allow.Type == spec.MRoomMembership {
|
|
allowedRoomID, err := spec.NewRoomID(allow.RoomID)
|
|
if err != nil {
|
|
util.GetLogger(ctx).Warnf("invalid room ID '%s' found in join_rule on room %s: %s", allow.RoomID, joinRuleEv.RoomID().String(), err)
|
|
} else {
|
|
allows = append(allows, *allowedRoomID)
|
|
}
|
|
}
|
|
}
|
|
return
|
|
}
|