mirror of
https://github.com/matrix-org/dendrite
synced 2024-12-15 09:13:44 +01:00
326 lines
12 KiB
Go
326 lines
12 KiB
Go
// Copyright 2017 Vector Creations Ltd
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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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"encoding/json"
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"fmt"
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"net/http"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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"github.com/matrix-org/dendrite/roomserver/api"
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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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log "github.com/sirupsen/logrus"
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)
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type stateEventInStateResp struct {
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gomatrixserverlib.ClientEvent
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PrevContent json.RawMessage `json:"prev_content,omitempty"`
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ReplacesState string `json:"replaces_state,omitempty"`
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}
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// OnIncomingStateRequest is called when a client makes a /rooms/{roomID}/state
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// request. It will fetch all the state events from the specified room and will
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// append the necessary keys to them if applicable before returning them.
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// Returns an error if something went wrong in the process.
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// TODO: Check if the user is in the room. If not, check if the room's history
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// is publicly visible. Current behaviour is returning an empty array if the
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// user cannot see the room's history.
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func OnIncomingStateRequest(ctx context.Context, device *userapi.Device, rsAPI api.ClientRoomserverAPI, roomID string) util.JSONResponse {
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var worldReadable bool
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var wantLatestState bool
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// First of all, get the latest state of the room. We need to do this
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// so that we can look at the history visibility of the room. If the
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// room is world-readable then we will always return the latest state.
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stateRes := api.QueryLatestEventsAndStateResponse{}
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if err := rsAPI.QueryLatestEventsAndState(ctx, &api.QueryLatestEventsAndStateRequest{
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RoomID: roomID,
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StateToFetch: []gomatrixserverlib.StateKeyTuple{},
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}, &stateRes); err != nil {
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util.GetLogger(ctx).WithError(err).Error("queryAPI.QueryLatestEventsAndState failed")
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return jsonerror.InternalServerError()
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}
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if !stateRes.RoomExists {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden("room does not exist"),
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}
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}
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// Look at the room state and see if we have a history visibility event
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// that marks the room as world-readable. If we don't then we assume that
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// the room is not world-readable.
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for _, ev := range stateRes.StateEvents {
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if ev.Type() == gomatrixserverlib.MRoomHistoryVisibility {
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content := map[string]string{}
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if err := json.Unmarshal(ev.Content(), &content); err != nil {
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util.GetLogger(ctx).WithError(err).Error("json.Unmarshal for history visibility failed")
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return jsonerror.InternalServerError()
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}
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if visibility, ok := content["history_visibility"]; ok {
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worldReadable = visibility == "world_readable"
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break
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}
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}
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}
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// If the room isn't world-readable then we will instead try to find out
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// the state of the room based on the user's membership. If the user is
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// in the room then we'll want the latest state. If the user has never
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// been in the room and the room isn't world-readable, then we won't
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// return any state. If the user was in the room previously but is no
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// longer then we will return the state at the time that the user left.
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// membershipRes will only be populated if the room is not world-readable.
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var membershipRes api.QueryMembershipForUserResponse
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if !worldReadable {
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// The room isn't world-readable so try to work out based on the
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// user's membership if we want the latest state or not.
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err := rsAPI.QueryMembershipForUser(ctx, &api.QueryMembershipForUserRequest{
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RoomID: roomID,
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UserID: device.UserID,
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}, &membershipRes)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Error("Failed to QueryMembershipForUser")
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return jsonerror.InternalServerError()
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}
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// If the user has never been in the room then stop at this point.
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// We won't tell the user about a room they have never joined.
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if !membershipRes.HasBeenInRoom {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden(fmt.Sprintf("Unknown room %q or user %q has never joined this room", roomID, device.UserID)),
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}
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}
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// Otherwise, if the user has been in the room, whether or not we
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// give them the latest state will depend on if they are *still* in
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// the room.
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wantLatestState = membershipRes.IsInRoom
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} else {
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// The room is world-readable so the user join state is irrelevant,
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// just get the latest room state instead.
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wantLatestState = true
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}
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util.GetLogger(ctx).WithFields(log.Fields{
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"roomID": roomID,
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"state_at_event": !wantLatestState,
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}).Info("Fetching all state")
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stateEvents := []gomatrixserverlib.ClientEvent{}
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if wantLatestState {
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// If we are happy to use the latest state, either because the user is
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// still in the room, or because the room is world-readable, then just
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// use the result of the previous QueryLatestEventsAndState response
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// to find the state event, if provided.
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for _, ev := range stateRes.StateEvents {
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stateEvents = append(
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stateEvents,
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gomatrixserverlib.HeaderedToClientEvent(ev, gomatrixserverlib.FormatAll),
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)
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}
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} else {
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// Otherwise, take the event ID of their leave event and work out what
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// the state of the room was before that event.
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var stateAfterRes api.QueryStateAfterEventsResponse
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err := rsAPI.QueryStateAfterEvents(ctx, &api.QueryStateAfterEventsRequest{
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RoomID: roomID,
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PrevEventIDs: []string{membershipRes.EventID},
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StateToFetch: []gomatrixserverlib.StateKeyTuple{},
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}, &stateAfterRes)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Error("Failed to QueryMembershipForUser")
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return jsonerror.InternalServerError()
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}
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for _, ev := range stateAfterRes.StateEvents {
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stateEvents = append(
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stateEvents,
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gomatrixserverlib.HeaderedToClientEvent(ev, gomatrixserverlib.FormatAll),
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)
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}
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}
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// Return the results to the requestor.
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: stateEvents,
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}
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}
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// OnIncomingStateTypeRequest is called when a client makes a
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// /rooms/{roomID}/state/{type}/{statekey} request. It will look in current
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// state to see if there is an event with that type and state key, if there
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// is then (by default) we return the content, otherwise a 404.
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// If eventFormat=true, sends the whole event else just the content.
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func OnIncomingStateTypeRequest(
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ctx context.Context, device *userapi.Device, rsAPI api.ClientRoomserverAPI,
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roomID, evType, stateKey string, eventFormat bool,
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) util.JSONResponse {
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var worldReadable bool
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var wantLatestState bool
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// Always fetch visibility so that we can work out whether to show
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// the latest events or the last event from when the user was joined.
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// Then include the requested event type and state key, assuming it
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// isn't for the same.
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stateToFetch := []gomatrixserverlib.StateKeyTuple{
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{
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EventType: evType,
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StateKey: stateKey,
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},
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}
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if evType != gomatrixserverlib.MRoomHistoryVisibility && stateKey != "" {
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stateToFetch = append(stateToFetch, gomatrixserverlib.StateKeyTuple{
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EventType: gomatrixserverlib.MRoomHistoryVisibility,
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StateKey: "",
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})
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}
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// First of all, get the latest state of the room. We need to do this
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// so that we can look at the history visibility of the room. If the
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// room is world-readable then we will always return the latest state.
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stateRes := api.QueryLatestEventsAndStateResponse{}
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if err := rsAPI.QueryLatestEventsAndState(ctx, &api.QueryLatestEventsAndStateRequest{
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RoomID: roomID,
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StateToFetch: stateToFetch,
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}, &stateRes); err != nil {
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util.GetLogger(ctx).WithError(err).Error("queryAPI.QueryLatestEventsAndState failed")
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return jsonerror.InternalServerError()
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}
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// Look at the room state and see if we have a history visibility event
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// that marks the room as world-readable. If we don't then we assume that
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// the room is not world-readable.
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for _, ev := range stateRes.StateEvents {
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if ev.Type() == gomatrixserverlib.MRoomHistoryVisibility {
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content := map[string]string{}
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if err := json.Unmarshal(ev.Content(), &content); err != nil {
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util.GetLogger(ctx).WithError(err).Error("json.Unmarshal for history visibility failed")
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return jsonerror.InternalServerError()
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}
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if visibility, ok := content["history_visibility"]; ok {
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worldReadable = visibility == "world_readable"
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break
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}
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}
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}
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// If the room isn't world-readable then we will instead try to find out
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// the state of the room based on the user's membership. If the user is
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// in the room then we'll want the latest state. If the user has never
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// been in the room and the room isn't world-readable, then we won't
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// return any state. If the user was in the room previously but is no
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// longer then we will return the state at the time that the user left.
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// membershipRes will only be populated if the room is not world-readable.
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var membershipRes api.QueryMembershipForUserResponse
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if !worldReadable {
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// The room isn't world-readable so try to work out based on the
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// user's membership if we want the latest state or not.
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err := rsAPI.QueryMembershipForUser(ctx, &api.QueryMembershipForUserRequest{
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RoomID: roomID,
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UserID: device.UserID,
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}, &membershipRes)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Error("Failed to QueryMembershipForUser")
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return jsonerror.InternalServerError()
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}
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// If the user has never been in the room then stop at this point.
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// We won't tell the user about a room they have never joined.
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if !membershipRes.HasBeenInRoom || membershipRes.Membership == gomatrixserverlib.Ban {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden(fmt.Sprintf("Unknown room %q or user %q has never joined this room", roomID, device.UserID)),
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}
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}
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// Otherwise, if the user has been in the room, whether or not we
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// give them the latest state will depend on if they are *still* in
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// the room.
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wantLatestState = membershipRes.IsInRoom
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} else {
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// The room is world-readable so the user join state is irrelevant,
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// just get the latest room state instead.
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wantLatestState = true
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}
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util.GetLogger(ctx).WithFields(log.Fields{
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"roomID": roomID,
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"evType": evType,
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"stateKey": stateKey,
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"state_at_event": !wantLatestState,
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}).Info("Fetching state")
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var event *gomatrixserverlib.HeaderedEvent
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if wantLatestState {
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// If we are happy to use the latest state, either because the user is
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// still in the room, or because the room is world-readable, then just
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// use the result of the previous QueryLatestEventsAndState response
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// to find the state event, if provided.
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for _, ev := range stateRes.StateEvents {
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if ev.Type() == evType && ev.StateKeyEquals(stateKey) {
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event = ev
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break
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}
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}
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} else {
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// Otherwise, take the event ID of their leave event and work out what
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// the state of the room was before that event.
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var stateAfterRes api.QueryStateAfterEventsResponse
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err := rsAPI.QueryStateAfterEvents(ctx, &api.QueryStateAfterEventsRequest{
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RoomID: roomID,
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PrevEventIDs: []string{membershipRes.EventID},
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StateToFetch: []gomatrixserverlib.StateKeyTuple{
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{
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EventType: evType,
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StateKey: stateKey,
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},
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},
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}, &stateAfterRes)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Error("Failed to QueryMembershipForUser")
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return jsonerror.InternalServerError()
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}
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if len(stateAfterRes.StateEvents) > 0 {
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event = stateAfterRes.StateEvents[0]
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}
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}
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// If there was no event found that matches all of the above criteria then
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// return an error.
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if event == nil {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound(fmt.Sprintf("Cannot find state event for %q", evType)),
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}
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}
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stateEvent := stateEventInStateResp{
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ClientEvent: gomatrixserverlib.HeaderedToClientEvent(event, gomatrixserverlib.FormatAll),
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}
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var res interface{}
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if eventFormat {
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res = stateEvent
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} else {
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res = stateEvent.Content
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}
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: res,
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}
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}
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