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29f4f1e45a
As the MSC doesn't require reverse lookups, we can just pull the room state and inspect via the roomserver database. To handle this, expand QueryCurrentState to support wildcards. Use all this and handle `?suggested_only`.
585 lines
18 KiB
Go
585 lines
18 KiB
Go
// Copyright 2021 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 msc2946 'Spaces Summary' implements https://github.com/matrix-org/matrix-doc/pull/2946
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package msc2946
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import (
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"context"
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"encoding/json"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/gorilla/mux"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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fs "github.com/matrix-org/dendrite/federationapi/api"
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"github.com/matrix-org/dendrite/internal/httputil"
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roomserver "github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/setup/base"
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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/util"
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"github.com/tidwall/gjson"
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)
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const (
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ConstCreateEventContentKey = "type"
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ConstCreateEventContentValueSpace = "m.space"
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ConstSpaceChildEventType = "m.space.child"
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ConstSpaceParentEventType = "m.space.parent"
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)
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type MSC2946ClientResponse struct {
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Rooms []gomatrixserverlib.MSC2946Room `json:"rooms"`
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NextBatch string `json:"next_batch"`
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}
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// Enable this MSC
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func Enable(
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base *base.BaseDendrite, rsAPI roomserver.RoomserverInternalAPI, userAPI userapi.UserInternalAPI,
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fsAPI fs.FederationInternalAPI, keyRing gomatrixserverlib.JSONVerifier,
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) error {
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clientAPI := httputil.MakeAuthAPI("spaces", userAPI, spacesHandler(rsAPI, fsAPI, base.Cfg.Global.ServerName))
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base.PublicClientAPIMux.Handle("/v1/rooms/{roomID}/hierarchy", clientAPI).Methods(http.MethodGet, http.MethodOptions)
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base.PublicClientAPIMux.Handle("/unstable/org.matrix.msc2946/rooms/{roomID}/hierarchy", clientAPI).Methods(http.MethodGet, http.MethodOptions)
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fedAPI := httputil.MakeExternalAPI(
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"msc2946_fed_spaces", func(req *http.Request) util.JSONResponse {
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fedReq, errResp := gomatrixserverlib.VerifyHTTPRequest(
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req, time.Now(), base.Cfg.Global.ServerName, keyRing,
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)
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if fedReq == nil {
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return errResp
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}
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// Extract the room ID from the request. Sanity check request data.
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params, err := httputil.URLDecodeMapValues(mux.Vars(req))
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if err != nil {
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return util.ErrorResponse(err)
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}
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roomID := params["roomID"]
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return federatedSpacesHandler(req.Context(), fedReq, roomID, rsAPI, fsAPI, base.Cfg.Global.ServerName)
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},
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)
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base.PublicFederationAPIMux.Handle("/unstable/org.matrix.msc2946/hierarchy/{roomID}", fedAPI).Methods(http.MethodGet)
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base.PublicFederationAPIMux.Handle("/v1/hierarchy/{roomID}", fedAPI).Methods(http.MethodGet)
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return nil
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}
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func federatedSpacesHandler(
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ctx context.Context, fedReq *gomatrixserverlib.FederationRequest, roomID string,
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rsAPI roomserver.RoomserverInternalAPI, fsAPI fs.FederationInternalAPI,
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thisServer gomatrixserverlib.ServerName,
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) util.JSONResponse {
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inMemoryBatchCache := make(map[string]set)
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u, err := url.Parse(fedReq.RequestURI())
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if err != nil {
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return util.JSONResponse{
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Code: 400,
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JSON: jsonerror.InvalidParam("bad request uri"),
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}
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}
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w := walker{
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rootRoomID: roomID,
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serverName: fedReq.Origin(),
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thisServer: thisServer,
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ctx: ctx,
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suggestedOnly: u.Query().Get("suggested_only") == "true",
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limit: 1000,
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// The main difference is that it does not recurse into spaces and does not support pagination.
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// This is somewhat equivalent to a Client-Server request with a max_depth=1.
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maxDepth: 1,
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rsAPI: rsAPI,
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fsAPI: fsAPI,
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inMemoryBatchCache: inMemoryBatchCache,
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}
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return w.walk()
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}
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func spacesHandler(
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rsAPI roomserver.RoomserverInternalAPI, fsAPI fs.FederationInternalAPI,
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thisServer gomatrixserverlib.ServerName,
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) func(*http.Request, *userapi.Device) util.JSONResponse {
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return func(req *http.Request, device *userapi.Device) util.JSONResponse {
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inMemoryBatchCache := make(map[string]set)
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// Extract the room ID from the request. Sanity check request data.
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params, err := httputil.URLDecodeMapValues(mux.Vars(req))
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if err != nil {
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return util.ErrorResponse(err)
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}
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roomID := params["roomID"]
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w := walker{
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suggestedOnly: req.URL.Query().Get("suggested_only") == "true",
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limit: parseInt(req.URL.Query().Get("limit"), 1000),
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maxDepth: parseInt(req.URL.Query().Get("max_depth"), -1),
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rootRoomID: roomID,
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caller: device,
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thisServer: thisServer,
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ctx: req.Context(),
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rsAPI: rsAPI,
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fsAPI: fsAPI,
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inMemoryBatchCache: inMemoryBatchCache,
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}
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return w.walk()
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}
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}
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type walker struct {
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rootRoomID string
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caller *userapi.Device
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serverName gomatrixserverlib.ServerName
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thisServer gomatrixserverlib.ServerName
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rsAPI roomserver.RoomserverInternalAPI
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fsAPI fs.FederationInternalAPI
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ctx context.Context
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suggestedOnly bool
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limit int
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maxDepth int
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// user ID|device ID|batch_num => event/room IDs sent to client
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inMemoryBatchCache map[string]set
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mu sync.Mutex
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}
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func (w *walker) callerID() string {
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if w.caller != nil {
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return w.caller.UserID + "|" + w.caller.ID
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}
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return string(w.serverName)
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}
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func (w *walker) alreadySent(id string) bool {
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w.mu.Lock()
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defer w.mu.Unlock()
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m, ok := w.inMemoryBatchCache[w.callerID()]
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if !ok {
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return false
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}
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return m[id]
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}
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func (w *walker) markSent(id string) {
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w.mu.Lock()
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defer w.mu.Unlock()
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m := w.inMemoryBatchCache[w.callerID()]
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if m == nil {
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m = make(set)
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}
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m[id] = true
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w.inMemoryBatchCache[w.callerID()] = m
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}
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type roomVisit struct {
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roomID string
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depth int
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vias []string // vias to query this room by
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}
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func (w *walker) walk() util.JSONResponse {
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if !w.authorised(w.rootRoomID) {
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if w.caller != nil {
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// CS API format
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return util.JSONResponse{
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Code: 403,
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JSON: jsonerror.Forbidden("room is unknown/forbidden"),
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}
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} else {
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// SS API format
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return util.JSONResponse{
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Code: 404,
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JSON: jsonerror.NotFound("room is unknown/forbidden"),
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}
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}
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}
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var discoveredRooms []gomatrixserverlib.MSC2946Room
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// Begin walking the graph starting with the room ID in the request in a queue of unvisited rooms
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// Depth first -> stack data structure
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unvisited := []roomVisit{{
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roomID: w.rootRoomID,
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depth: 0,
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}}
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processed := make(set)
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for len(unvisited) > 0 {
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if len(discoveredRooms) > w.limit {
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break
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}
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// pop the stack
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rv := 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[rv.roomID] || rv.roomID == "" || (w.maxDepth > 0 && rv.depth > w.maxDepth) {
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continue
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}
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// Mark this room as processed.
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processed[rv.roomID] = true
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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 := w.stateEvent(rv.roomID, gomatrixserverlib.MRoomCreate, "")
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if create != nil {
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// escape the `.`s so gjson doesn't think it's nested
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roomType = gjson.GetBytes(create.Content(), strings.ReplaceAll(ConstCreateEventContentKey, ".", `\.`)).Str
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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 []gomatrixserverlib.MSC2946StrippedEvent
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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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if w.roomExists(rv.roomID) && w.authorised(rv.roomID) {
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// Get all `m.space.child` state events for this room
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events, err := w.childReferences(rv.roomID)
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if err != nil {
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util.GetLogger(w.ctx).WithError(err).WithField("room_id", rv.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 := w.publicRoomsChunk(rv.roomID)
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discoveredRooms = append(discoveredRooms, gomatrixserverlib.MSC2946Room{
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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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} else {
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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, err := w.federatedRoomInfo(rv.roomID, rv.vias)
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if err != nil {
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util.GetLogger(w.ctx).WithError(err).WithField("room_id", rv.roomID).Errorf("failed to query federated spaces")
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continue
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}
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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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}
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}
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// mark processed rooms for pagination purposes
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for _, room := range discoveredRooms {
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if !w.alreadySent(room.RoomID) {
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w.markSent(room.RoomID)
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}
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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 != ConstCreateEventContentValueSpace {
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continue
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}
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uniqueRooms := make(map[string][]string)
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for _, ev := range discoveredChildEvents {
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spaceContent := struct {
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Via []string `json:"via"`
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}{}
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_ = json.Unmarshal(ev.Content, &spaceContent)
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uniqueRooms[ev.StateKey] = spaceContent.Via
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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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for roomID, vias := range uniqueRooms {
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unvisited = append(unvisited, roomVisit{
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roomID: roomID,
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depth: rv.depth + 1,
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vias: vias,
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})
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}
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}
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if w.caller != nil {
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// return CS API format
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return util.JSONResponse{
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Code: 200,
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JSON: MSC2946ClientResponse{
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Rooms: discoveredRooms,
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},
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}
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}
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// return SS API format
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// the first discovered room will be the room asked for, and subsequent ones the depth=1 children
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if len(discoveredRooms) == 0 {
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return util.JSONResponse{
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Code: 404,
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JSON: jsonerror.NotFound("room is unknown/forbidden"),
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}
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}
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return util.JSONResponse{
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Code: 200,
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JSON: gomatrixserverlib.MSC2946SpacesResponse{
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Room: discoveredRooms[0],
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Children: discoveredRooms[1:],
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},
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}
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}
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func (w *walker) stateEvent(roomID, evType, stateKey string) *gomatrixserverlib.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 := w.rsAPI.QueryCurrentState(w.ctx, &roomserver.QueryCurrentStateRequest{
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RoomID: roomID,
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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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func (w *walker) publicRoomsChunk(roomID string) *gomatrixserverlib.PublicRoom {
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pubRooms, err := roomserver.PopulatePublicRooms(w.ctx, []string{roomID}, w.rsAPI)
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if err != nil {
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util.GetLogger(w.ctx).WithError(err).Error("failed to PopulatePublicRooms")
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return nil
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}
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if len(pubRooms) == 0 {
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return nil
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}
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return &pubRooms[0]
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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 (w *walker) federatedRoomInfo(roomID string, vias []string) (*gomatrixserverlib.MSC2946SpacesResponse, error) {
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// only do federated requests for client requests
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if w.caller == nil {
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return nil, nil
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}
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util.GetLogger(w.ctx).Infof("Querying federatedRoomInfo via %+v", vias)
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ctx := 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(w.thisServer) {
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continue
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}
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res, err := w.fsAPI.MSC2946Spaces(ctx, gomatrixserverlib.ServerName(serverName), roomID, w.suggestedOnly)
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if err != nil {
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util.GetLogger(w.ctx).WithError(err).Warnf("failed to call MSC2946Spaces on server %s", serverName)
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continue
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}
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return &res, nil
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}
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return nil, nil
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}
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func (w *walker) roomExists(roomID string) bool {
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var queryRes roomserver.QueryServerJoinedToRoomResponse
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err := w.rsAPI.QueryServerJoinedToRoom(w.ctx, &roomserver.QueryServerJoinedToRoomRequest{
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RoomID: roomID,
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ServerName: w.thisServer,
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}, &queryRes)
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if err != nil {
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util.GetLogger(w.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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// authorised returns true iff the user is joined this room or the room is world_readable
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func (w *walker) authorised(roomID string) bool {
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if w.caller != nil {
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return w.authorisedUser(roomID)
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}
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return w.authorisedServer(roomID)
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}
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// authorisedServer returns true iff the server is joined this room or the room is world_readable
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func (w *walker) authorisedServer(roomID string) bool {
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// Check history visibility first
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hisVisTuple := gomatrixserverlib.StateKeyTuple{
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EventType: gomatrixserverlib.MRoomHistoryVisibility,
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StateKey: "",
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}
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var queryRoomRes roomserver.QueryCurrentStateResponse
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err := w.rsAPI.QueryCurrentState(w.ctx, &roomserver.QueryCurrentStateRequest{
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RoomID: roomID,
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StateTuples: []gomatrixserverlib.StateKeyTuple{
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hisVisTuple,
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},
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}, &queryRoomRes)
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if err != nil {
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util.GetLogger(w.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 server is joined to the room
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var queryRes fs.QueryJoinedHostServerNamesInRoomResponse
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err = w.fsAPI.QueryJoinedHostServerNamesInRoom(w.ctx, &fs.QueryJoinedHostServerNamesInRoomRequest{
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RoomID: roomID,
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}, &queryRes)
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if err != nil {
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util.GetLogger(w.ctx).WithError(err).Error("failed to QueryJoinedHostServerNamesInRoom")
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return false
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}
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for _, srv := range queryRes.ServerNames {
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if srv == w.serverName {
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return true
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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 joined this room or the room is world_readable
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func (w *walker) authorisedUser(roomID string) bool {
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hisVisTuple := gomatrixserverlib.StateKeyTuple{
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EventType: gomatrixserverlib.MRoomHistoryVisibility,
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StateKey: "",
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}
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roomMemberTuple := gomatrixserverlib.StateKeyTuple{
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EventType: gomatrixserverlib.MRoomMember,
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StateKey: w.caller.UserID,
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}
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var queryRes roomserver.QueryCurrentStateResponse
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err := w.rsAPI.QueryCurrentState(w.ctx, &roomserver.QueryCurrentStateRequest{
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RoomID: roomID,
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StateTuples: []gomatrixserverlib.StateKeyTuple{
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hisVisTuple, roomMemberTuple,
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},
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}, &queryRes)
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if err != nil {
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util.GetLogger(w.ctx).WithError(err).Error("failed to QueryCurrentState")
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return false
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}
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memberEv := queryRes.StateEvents[roomMemberTuple]
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hisVisEv := queryRes.StateEvents[hisVisTuple]
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if memberEv != nil {
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membership, _ := memberEv.Membership()
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if membership == gomatrixserverlib.Join {
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return true
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}
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}
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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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return false
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}
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// references returns all child references pointing to or from this room.
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func (w *walker) childReferences(roomID string) ([]gomatrixserverlib.MSC2946StrippedEvent, error) {
|
|
createTuple := gomatrixserverlib.StateKeyTuple{
|
|
EventType: gomatrixserverlib.MRoomCreate,
|
|
StateKey: "",
|
|
}
|
|
var res roomserver.QueryCurrentStateResponse
|
|
err := w.rsAPI.QueryCurrentState(context.Background(), &roomserver.QueryCurrentStateRequest{
|
|
RoomID: roomID,
|
|
AllowWildcards: true,
|
|
StateTuples: []gomatrixserverlib.StateKeyTuple{
|
|
createTuple, {
|
|
EventType: ConstSpaceChildEventType,
|
|
StateKey: "*",
|
|
},
|
|
},
|
|
}, &res)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// don't return any child refs if the room is not a space room
|
|
if res.StateEvents[createTuple] != nil {
|
|
// escape the `.`s so gjson doesn't think it's nested
|
|
roomType := gjson.GetBytes(res.StateEvents[createTuple].Content(), strings.ReplaceAll(ConstCreateEventContentKey, ".", `\.`)).Str
|
|
if roomType != ConstCreateEventContentValueSpace {
|
|
return nil, nil
|
|
}
|
|
}
|
|
delete(res.StateEvents, createTuple)
|
|
|
|
el := make([]gomatrixserverlib.MSC2946StrippedEvent, 0, len(res.StateEvents))
|
|
for _, ev := range res.StateEvents {
|
|
content := gjson.ParseBytes(ev.Content())
|
|
// only return events that have a `via` key as per MSC1772
|
|
// else we'll incorrectly walk redacted events (as the link
|
|
// is in the state_key)
|
|
if content.Get("via").Exists() {
|
|
strip := stripped(ev.Event)
|
|
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 w.suggestedOnly && !content.Get("suggested").Bool() {
|
|
continue
|
|
}
|
|
el = append(el, *strip)
|
|
}
|
|
}
|
|
return el, nil
|
|
}
|
|
|
|
type set map[string]bool
|
|
|
|
func stripped(ev *gomatrixserverlib.Event) *gomatrixserverlib.MSC2946StrippedEvent {
|
|
if ev.StateKey() == nil {
|
|
return nil
|
|
}
|
|
return &gomatrixserverlib.MSC2946StrippedEvent{
|
|
Type: ev.Type(),
|
|
StateKey: *ev.StateKey(),
|
|
Content: ev.Content(),
|
|
Sender: ev.Sender(),
|
|
RoomID: ev.RoomID(),
|
|
}
|
|
}
|
|
|
|
func eventKey(event *gomatrixserverlib.MSC2946StrippedEvent) string {
|
|
return event.RoomID + "|" + event.Type + "|" + event.StateKey
|
|
}
|
|
|
|
func spaceTargetStripped(event *gomatrixserverlib.MSC2946StrippedEvent) string {
|
|
if event.StateKey == "" {
|
|
return "" // no-op
|
|
}
|
|
switch event.Type {
|
|
case ConstSpaceParentEventType:
|
|
return event.StateKey
|
|
case ConstSpaceChildEventType:
|
|
return event.StateKey
|
|
}
|
|
return ""
|
|
}
|
|
|
|
func parseInt(intstr string, defaultVal int) int {
|
|
i, err := strconv.ParseInt(intstr, 10, 32)
|
|
if err != nil {
|
|
return defaultVal
|
|
}
|
|
return int(i)
|
|
}
|