370 lines
12 KiB
Go
370 lines
12 KiB
Go
// Copyright 2022 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 routing
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import (
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"context"
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"database/sql"
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"encoding/json"
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"fmt"
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"net/http"
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"strconv"
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"time"
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"github.com/matrix-org/dendrite/internal/caching"
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"github.com/matrix-org/dendrite/internal/sqlutil"
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roomserver "github.com/matrix-org/dendrite/roomserver/api"
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rstypes "github.com/matrix-org/dendrite/roomserver/types"
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"github.com/matrix-org/dendrite/syncapi/internal"
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"github.com/matrix-org/dendrite/syncapi/storage"
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"github.com/matrix-org/dendrite/syncapi/synctypes"
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"github.com/matrix-org/dendrite/syncapi/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/spec"
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"github.com/matrix-org/util"
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"github.com/sirupsen/logrus"
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)
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type ContextRespsonse struct {
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End string `json:"end"`
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Event *synctypes.ClientEvent `json:"event,omitempty"`
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EventsAfter []synctypes.ClientEvent `json:"events_after,omitempty"`
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EventsBefore []synctypes.ClientEvent `json:"events_before,omitempty"`
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Start string `json:"start"`
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State []synctypes.ClientEvent `json:"state,omitempty"`
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}
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func Context(
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req *http.Request, device *userapi.Device,
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rsAPI roomserver.SyncRoomserverAPI,
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syncDB storage.Database,
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roomID, eventID string,
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lazyLoadCache caching.LazyLoadCache,
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) util.JSONResponse {
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snapshot, err := syncDB.NewDatabaseSnapshot(req.Context())
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if err != nil {
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.InternalServerError{},
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}
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}
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var succeeded bool
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defer sqlutil.EndTransactionWithCheck(snapshot, &succeeded, &err)
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filter, err := parseRoomEventFilter(req)
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if err != nil {
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errMsg := ""
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switch err.(type) {
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case *json.InvalidUnmarshalError:
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errMsg = "unable to parse filter"
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case *strconv.NumError:
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errMsg = "unable to parse limit"
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default:
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errMsg = err.Error()
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}
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: spec.InvalidParam(errMsg),
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Headers: nil,
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}
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}
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if filter.Rooms != nil {
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*filter.Rooms = append(*filter.Rooms, roomID)
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}
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userID, err := spec.NewUserID(device.UserID, true)
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if err != nil {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: spec.InvalidParam("Device UserID is invalid"),
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}
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}
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ctx := req.Context()
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membershipRes := roomserver.QueryMembershipForUserResponse{}
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membershipReq := roomserver.QueryMembershipForUserRequest{UserID: *userID, RoomID: roomID}
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if err = rsAPI.QueryMembershipForUser(ctx, &membershipReq, &membershipRes); err != nil {
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logrus.WithError(err).Error("unable to query membership")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.InternalServerError{},
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}
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}
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if !membershipRes.RoomExists {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: spec.Forbidden("room does not exist"),
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}
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}
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stateFilter := synctypes.StateFilter{
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NotSenders: filter.NotSenders,
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NotTypes: filter.NotTypes,
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Senders: filter.Senders,
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Types: filter.Types,
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LazyLoadMembers: filter.LazyLoadMembers,
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IncludeRedundantMembers: filter.IncludeRedundantMembers,
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NotRooms: filter.NotRooms,
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Rooms: filter.Rooms,
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ContainsURL: filter.ContainsURL,
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}
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id, requestedEvent, err := snapshot.SelectContextEvent(ctx, roomID, eventID)
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if err != nil {
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if err == sql.ErrNoRows {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: spec.NotFound(fmt.Sprintf("Event %s not found", eventID)),
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}
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}
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logrus.WithError(err).WithField("eventID", eventID).Error("unable to find requested event")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.InternalServerError{},
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}
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}
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// verify the user is allowed to see the context for this room/event
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startTime := time.Now()
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filteredEvents, err := internal.ApplyHistoryVisibilityFilter(ctx, snapshot, rsAPI, []*rstypes.HeaderedEvent{&requestedEvent}, nil, device.UserID, "context")
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if err != nil {
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logrus.WithError(err).Error("unable to apply history visibility filter")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.InternalServerError{},
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}
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}
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logrus.WithFields(logrus.Fields{
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"duration": time.Since(startTime),
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"room_id": roomID,
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}).Debug("applied history visibility (context)")
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if len(filteredEvents) == 0 {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: spec.Forbidden("User is not allowed to query context"),
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}
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}
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eventsBefore, err := snapshot.SelectContextBeforeEvent(ctx, id, roomID, filter)
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if err != nil && err != sql.ErrNoRows {
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logrus.WithError(err).Error("unable to fetch before events")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.InternalServerError{},
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}
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}
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_, eventsAfter, err := snapshot.SelectContextAfterEvent(ctx, id, roomID, filter)
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if err != nil && err != sql.ErrNoRows {
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logrus.WithError(err).Error("unable to fetch after events")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.InternalServerError{},
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}
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}
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startTime = time.Now()
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eventsBeforeFiltered, eventsAfterFiltered, err := applyHistoryVisibilityOnContextEvents(ctx, snapshot, rsAPI, eventsBefore, eventsAfter, device.UserID)
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if err != nil {
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logrus.WithError(err).Error("unable to apply history visibility filter")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.InternalServerError{},
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}
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}
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logrus.WithFields(logrus.Fields{
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"duration": time.Since(startTime),
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"room_id": roomID,
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}).Debug("applied history visibility (context eventsBefore/eventsAfter)")
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// TODO: Get the actual state at the last event returned by SelectContextAfterEvent
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state, err := snapshot.CurrentState(ctx, roomID, &stateFilter, nil)
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if err != nil {
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logrus.WithError(err).Error("unable to fetch current room state")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.InternalServerError{},
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}
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}
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eventsBeforeClient := synctypes.ToClientEvents(gomatrixserverlib.ToPDUs(eventsBeforeFiltered), synctypes.FormatAll, func(roomID spec.RoomID, senderID spec.SenderID) (*spec.UserID, error) {
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return rsAPI.QueryUserIDForSender(ctx, roomID, senderID)
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})
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eventsAfterClient := synctypes.ToClientEvents(gomatrixserverlib.ToPDUs(eventsAfterFiltered), synctypes.FormatAll, func(roomID spec.RoomID, senderID spec.SenderID) (*spec.UserID, error) {
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return rsAPI.QueryUserIDForSender(ctx, roomID, senderID)
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})
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newState := state
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if filter.LazyLoadMembers {
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allEvents := append(eventsBeforeFiltered, eventsAfterFiltered...)
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allEvents = append(allEvents, &requestedEvent)
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evs := synctypes.ToClientEvents(gomatrixserverlib.ToPDUs(allEvents), synctypes.FormatAll, func(roomID spec.RoomID, senderID spec.SenderID) (*spec.UserID, error) {
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return rsAPI.QueryUserIDForSender(ctx, roomID, senderID)
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})
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newState, err = applyLazyLoadMembers(ctx, device, snapshot, roomID, evs, lazyLoadCache)
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if err != nil {
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logrus.WithError(err).Error("unable to load membership events")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.InternalServerError{},
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}
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}
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}
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ev := synctypes.ToClientEventDefault(func(roomID spec.RoomID, senderID spec.SenderID) (*spec.UserID, error) {
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return rsAPI.QueryUserIDForSender(ctx, roomID, senderID)
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}, requestedEvent)
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response := ContextRespsonse{
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Event: &ev,
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EventsAfter: eventsAfterClient,
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EventsBefore: eventsBeforeClient,
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State: synctypes.ToClientEvents(gomatrixserverlib.ToPDUs(newState), synctypes.FormatAll, func(roomID spec.RoomID, senderID spec.SenderID) (*spec.UserID, error) {
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return rsAPI.QueryUserIDForSender(ctx, roomID, senderID)
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}),
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}
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if len(response.State) > filter.Limit {
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response.State = response.State[len(response.State)-filter.Limit:]
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}
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start, end, err := getStartEnd(ctx, snapshot, eventsBefore, eventsAfter)
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if err == nil {
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response.End = end.String()
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response.Start = start.String()
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}
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succeeded = true
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: response,
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}
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}
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// applyHistoryVisibilityOnContextEvents is a helper function to avoid roundtrips to the roomserver
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// by combining the events before and after the context event. Returns the filtered events,
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// and an error, if any.
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func applyHistoryVisibilityOnContextEvents(
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ctx context.Context, snapshot storage.DatabaseTransaction, rsAPI roomserver.SyncRoomserverAPI,
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eventsBefore, eventsAfter []*rstypes.HeaderedEvent,
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userID string,
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) (filteredBefore, filteredAfter []*rstypes.HeaderedEvent, err error) {
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eventIDsBefore := make(map[string]struct{}, len(eventsBefore))
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eventIDsAfter := make(map[string]struct{}, len(eventsAfter))
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// Remember before/after eventIDs, so we can restore them
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// after applying history visibility checks
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for _, ev := range eventsBefore {
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eventIDsBefore[ev.EventID()] = struct{}{}
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}
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for _, ev := range eventsAfter {
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eventIDsAfter[ev.EventID()] = struct{}{}
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}
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allEvents := append(eventsBefore, eventsAfter...)
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filteredEvents, err := internal.ApplyHistoryVisibilityFilter(ctx, snapshot, rsAPI, allEvents, nil, userID, "context")
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if err != nil {
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return nil, nil, err
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}
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// "Restore" events in the correct context
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for _, ev := range filteredEvents {
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if _, ok := eventIDsBefore[ev.EventID()]; ok {
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filteredBefore = append(filteredBefore, ev)
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}
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if _, ok := eventIDsAfter[ev.EventID()]; ok {
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filteredAfter = append(filteredAfter, ev)
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}
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}
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return filteredBefore, filteredAfter, nil
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}
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func getStartEnd(ctx context.Context, snapshot storage.DatabaseTransaction, startEvents, endEvents []*rstypes.HeaderedEvent) (start, end types.TopologyToken, err error) {
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if len(startEvents) > 0 {
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start, err = snapshot.EventPositionInTopology(ctx, startEvents[0].EventID())
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if err != nil {
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return
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}
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}
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if len(endEvents) > 0 {
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end, err = snapshot.EventPositionInTopology(ctx, endEvents[0].EventID())
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}
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return
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}
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func applyLazyLoadMembers(
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ctx context.Context,
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device *userapi.Device,
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snapshot storage.DatabaseTransaction,
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roomID string,
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events []synctypes.ClientEvent,
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lazyLoadCache caching.LazyLoadCache,
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) ([]*rstypes.HeaderedEvent, error) {
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eventSenders := make(map[string]struct{})
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// get members who actually send an event
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for _, e := range events {
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// Don't add membership events the client should already know about
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if _, cached := lazyLoadCache.IsLazyLoadedUserCached(device, e.RoomID, e.Sender); cached {
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continue
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}
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eventSenders[e.Sender] = struct{}{}
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}
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wantUsers := make([]string, 0, len(eventSenders))
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for userID := range eventSenders {
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wantUsers = append(wantUsers, userID)
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}
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// Query missing membership events
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filter := synctypes.DefaultStateFilter()
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filter.Senders = &wantUsers
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filter.Types = &[]string{spec.MRoomMember}
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memberships, err := snapshot.GetStateEventsForRoom(ctx, roomID, &filter)
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if err != nil {
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return nil, err
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}
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// cache the membership events
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for _, membership := range memberships {
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lazyLoadCache.StoreLazyLoadedUser(device, roomID, *membership.StateKey(), membership.EventID())
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}
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return memberships, nil
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}
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func parseRoomEventFilter(req *http.Request) (*synctypes.RoomEventFilter, error) {
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// Default room filter
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filter := &synctypes.RoomEventFilter{Limit: 10}
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l := req.URL.Query().Get("limit")
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f := req.URL.Query().Get("filter")
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if l != "" {
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limit, err := strconv.Atoi(l)
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if err != nil {
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return nil, err
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}
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// NOTSPEC: feels like a good idea to have an upper bound limit
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if limit > 100 {
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limit = 100
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}
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filter.Limit = limit
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}
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if f != "" {
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if err := json.Unmarshal([]byte(f), &filter); err != nil {
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return nil, err
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}
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}
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return filter, nil
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}
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