mirror of
https://github.com/matrix-org/dendrite
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654 lines
20 KiB
Go
654 lines
20 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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"sort"
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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/google/uuid"
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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,omitempty"`
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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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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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// inline cache as we don't have pagination in federation mode
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paginationCache: make(map[string]paginationInfo),
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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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// declared outside the returned handler so it persists between calls
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// TODO: clear based on... time?
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paginationCache := make(map[string]paginationInfo)
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return func(req *http.Request, device *userapi.Device) util.JSONResponse {
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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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paginationToken: req.URL.Query().Get("from"),
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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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paginationCache: paginationCache,
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}
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return w.walk()
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}
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}
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type paginationInfo struct {
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processed set
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unvisited []roomVisit
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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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paginationToken string
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paginationCache map[string]paginationInfo
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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) newPaginationCache() (string, paginationInfo) {
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p := paginationInfo{
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processed: make(set),
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unvisited: nil,
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}
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tok := uuid.NewString()
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return tok, p
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}
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func (w *walker) loadPaginationCache(paginationToken string) *paginationInfo {
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w.mu.Lock()
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defer w.mu.Unlock()
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p := w.paginationCache[paginationToken]
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return &p
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}
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func (w *walker) storePaginationCache(paginationToken string, cache paginationInfo) {
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w.mu.Lock()
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defer w.mu.Unlock()
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w.paginationCache[paginationToken] = cache
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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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var cache *paginationInfo
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if w.paginationToken != "" {
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cache = w.loadPaginationCache(w.paginationToken)
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if cache == nil {
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return util.JSONResponse{
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Code: 400,
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JSON: jsonerror.InvalidArgumentValue("invalid from"),
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}
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}
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} else {
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tok, c := w.newPaginationCache()
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cache = &c
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w.paginationToken = tok
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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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c.unvisited = append(c.unvisited, roomVisit{
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roomID: w.rootRoomID,
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depth: 0,
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})
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}
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processed := cache.processed
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unvisited := cache.unvisited
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// Depth first -> stack data structure
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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.isSet(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.set(rv.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 := 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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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 = ConstCreateEventContentValueSpace
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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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// 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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unvisited = append(unvisited, roomVisit{
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roomID: ev.StateKey,
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depth: rv.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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if len(unvisited) > 0 {
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// we still have more rooms so we need to send back a pagination token,
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// we probably hit a room limit
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cache.processed = processed
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cache.unvisited = unvisited
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w.storePaginationCache(w.paginationToken, *cache)
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} else {
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// clear the pagination token so we don't send it back to the client
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// Note we do NOT nuke the cache just in case this response is lost
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// and the client retries it.
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w.paginationToken = ""
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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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NextBatch: w.paginationToken,
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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 %s via %+v", roomID, 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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// 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 = []gomatrixserverlib.MSC2946StrippedEvent{}
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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 = []gomatrixserverlib.MSC2946StrippedEvent{}
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}
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res.Children[i] = child
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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
|
|
err = w.fsAPI.QueryJoinedHostServerNamesInRoom(w.ctx, &fs.QueryJoinedHostServerNamesInRoomRequest{
|
|
RoomID: roomID,
|
|
}, &queryRes)
|
|
if err != nil {
|
|
util.GetLogger(w.ctx).WithError(err).Error("failed to QueryJoinedHostServerNamesInRoom")
|
|
return false
|
|
}
|
|
for _, srv := range queryRes.ServerNames {
|
|
if srv == w.serverName {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// authorisedUser returns true iff the user is joined this room or the room is world_readable
|
|
func (w *walker) authorisedUser(roomID string) bool {
|
|
hisVisTuple := gomatrixserverlib.StateKeyTuple{
|
|
EventType: gomatrixserverlib.MRoomHistoryVisibility,
|
|
StateKey: "",
|
|
}
|
|
roomMemberTuple := gomatrixserverlib.StateKeyTuple{
|
|
EventType: gomatrixserverlib.MRoomMember,
|
|
StateKey: w.caller.UserID,
|
|
}
|
|
var queryRes roomserver.QueryCurrentStateResponse
|
|
err := w.rsAPI.QueryCurrentState(w.ctx, &roomserver.QueryCurrentStateRequest{
|
|
RoomID: roomID,
|
|
StateTuples: []gomatrixserverlib.StateKeyTuple{
|
|
hisVisTuple, roomMemberTuple,
|
|
},
|
|
}, &queryRes)
|
|
if err != nil {
|
|
util.GetLogger(w.ctx).WithError(err).Error("failed to QueryCurrentState")
|
|
return false
|
|
}
|
|
memberEv := queryRes.StateEvents[roomMemberTuple]
|
|
hisVisEv := queryRes.StateEvents[hisVisTuple]
|
|
if memberEv != nil {
|
|
membership, _ := memberEv.Membership()
|
|
if membership == gomatrixserverlib.Join || membership == gomatrixserverlib.Invite {
|
|
return true
|
|
}
|
|
}
|
|
if hisVisEv != nil {
|
|
hisVis, _ := hisVisEv.HistoryVisibility()
|
|
if hisVis == "world_readable" {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// references returns all child references pointing to or from this room.
|
|
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)
|
|
}
|
|
}
|
|
// 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
|
|
}
|
|
|
|
type set map[string]struct{}
|
|
|
|
func (s set) set(val string) {
|
|
s[val] = struct{}{}
|
|
}
|
|
func (s set) isSet(val string) bool {
|
|
_, ok := s[val]
|
|
return ok
|
|
}
|
|
|
|
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(),
|
|
OriginServerTS: ev.OriginServerTS(),
|
|
}
|
|
}
|
|
|
|
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)
|
|
}
|