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Enforce history visibility etc for /rooms/{roomID}/state (#1340)

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* Enforce history visibility etc for /rooms/{roomID}/state

* Deduplicate OnIncomingStateRequest and OnIncomingStateTypeRequest

* Revert "Deduplicate OnIncomingStateRequest and OnIncomingStateTypeRequest"

This reverts commit 335035d66e.
This commit is contained in:
Neil Alexander 2020-08-25 18:43:56 +01:00 committed by GitHub
parent 48850d9995
commit c60270eea3
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 100 additions and 40 deletions
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2
clientapi/routing/routing.go
View file

@ -201,7 +201,7 @@ func Setup(
if err != nil {
return util.ErrorResponse(err)
}
return OnIncomingStateRequest(req.Context(), rsAPI, vars["roomID"])
return OnIncomingStateRequest(req.Context(), device, rsAPI, vars["roomID"])
})).Methods(http.MethodGet, http.MethodOptions)
r0mux.Handle("/rooms/{roomID}/state/{type:[^/]+/?}", httputil.MakeAuthAPI("room_state", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {

134
clientapi/routing/state.go
View file

@ -22,7 +22,6 @@ import (
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/syncapi/types"
userapi "github.com/matrix-org/dendrite/userapi/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
@ -42,57 +41,118 @@ type stateEventInStateResp struct {
// TODO: Check if the user is in the room. If not, check if the room's history
// is publicly visible. Current behaviour is returning an empty array if the
// user cannot see the room's history.
func OnIncomingStateRequest(ctx context.Context, rsAPI api.RoomserverInternalAPI, roomID string) util.JSONResponse {
// TODO(#287): Auth request and handle the case where the user has left (where
// we should return the state at the poin they left)
stateReq := api.QueryLatestEventsAndStateRequest{
RoomID: roomID,
}
stateRes := api.QueryLatestEventsAndStateResponse{}
func OnIncomingStateRequest(ctx context.Context, device *userapi.Device, rsAPI api.RoomserverInternalAPI, roomID string) util.JSONResponse {
var worldReadable bool
var wantLatestState bool
if err := rsAPI.QueryLatestEventsAndState(ctx, &stateReq, &stateRes); err != nil {
// First of all, get the latest state of the room. We need to do this
// so that we can look at the history visibility of the room. If the
// room is world-readable then we will always return the latest state.
stateRes := api.QueryLatestEventsAndStateResponse{}
if err := rsAPI.QueryLatestEventsAndState(ctx, &api.QueryLatestEventsAndStateRequest{
RoomID: roomID,
StateToFetch: []gomatrixserverlib.StateKeyTuple{},
}, &stateRes); err != nil {
util.GetLogger(ctx).WithError(err).Error("queryAPI.QueryLatestEventsAndState failed")
return jsonerror.InternalServerError()
}
if len(stateRes.StateEvents) == 0 {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound("cannot find state"),
}
}
resp := []stateEventInStateResp{}
// Fill the prev_content and replaces_state keys if necessary
for _, event := range stateRes.StateEvents {
stateEvent := stateEventInStateResp{
ClientEvent: gomatrixserverlib.HeaderedToClientEvents(
[]gomatrixserverlib.HeaderedEvent{event}, gomatrixserverlib.FormatAll,
)[0],
}
var prevEventRef types.PrevEventRef
if len(event.Unsigned()) > 0 {
if err := json.Unmarshal(event.Unsigned(), &prevEventRef); err != nil {
util.GetLogger(ctx).WithError(err).Error("json.Unmarshal failed")
// Look at the room state and see if we have a history visibility event
// that marks the room as world-readable. If we don't then we assume that
// the room is not world-readable.
for _, ev := range stateRes.StateEvents {
if ev.Type() == gomatrixserverlib.MRoomHistoryVisibility {
content := map[string]string{}
if err := json.Unmarshal(ev.Content(), &content); err != nil {
util.GetLogger(ctx).WithError(err).Error("json.Unmarshal for history visibility failed")
return jsonerror.InternalServerError()
}
// Fills the previous state event ID if the state event replaces another
// state event
if len(prevEventRef.ReplacesState) > 0 {
stateEvent.ReplacesState = prevEventRef.ReplacesState
if visibility, ok := content["history_visibility"]; ok {
worldReadable = visibility == "world_readable"
break
}
// Fill the previous event if the state event references a previous event
if prevEventRef.PrevContent != nil {
stateEvent.PrevContent = prevEventRef.PrevContent
}
}
resp = append(resp, stateEvent)
// If the room isn't world-readable then we will instead try to find out
// the state of the room based on the user's membership. If the user is
// in the room then we'll want the latest state. If the user has never
// been in the room and the room isn't world-readable, then we won't
// return any state. If the user was in the room previously but is no
// longer then we will return the state at the time that the user left.
// membershipRes will only be populated if the room is not world-readable.
var membershipRes api.QueryMembershipForUserResponse
if !worldReadable {
// The room isn't world-readable so try to work out based on the
// user's membership if we want the latest state or not.
err := rsAPI.QueryMembershipForUser(ctx, &api.QueryMembershipForUserRequest{
RoomID: roomID,
UserID: device.UserID,
}, &membershipRes)
if err != nil {
util.GetLogger(ctx).WithError(err).Error("Failed to QueryMembershipForUser")
return jsonerror.InternalServerError()
}
// If the user has never been in the room then stop at this point.
// We won't tell the user about a room they have never joined.
if !membershipRes.HasBeenInRoom {
return util.JSONResponse{
Code: http.StatusForbidden,
JSON: jsonerror.Forbidden(fmt.Sprintf("Unknown room %q or user %q has never joined this room", roomID, device.UserID)),
}
}
// Otherwise, if the user has been in the room, whether or not we
// give them the latest state will depend on if they are *still* in
// the room.
wantLatestState = membershipRes.IsInRoom
} else {
// The room is world-readable so the user join state is irrelevant,
// just get the latest room state instead.
wantLatestState = true
}
util.GetLogger(ctx).WithFields(log.Fields{
"roomID": roomID,
"state_at_event": !wantLatestState,
}).Info("Fetching all state")
stateEvents := []gomatrixserverlib.ClientEvent{}
if wantLatestState {
// If we are happy to use the latest state, either because the user is
// still in the room, or because the room is world-readable, then just
// use the result of the previous QueryLatestEventsAndState response
// to find the state event, if provided.
for _, ev := range stateRes.StateEvents {
stateEvents = append(
stateEvents,
gomatrixserverlib.HeaderedToClientEvent(ev, gomatrixserverlib.FormatAll),
)
}
} else {
// Otherwise, take the event ID of their leave event and work out what
// the state of the room was before that event.
var stateAfterRes api.QueryStateAfterEventsResponse
err := rsAPI.QueryStateAfterEvents(ctx, &api.QueryStateAfterEventsRequest{
RoomID: roomID,
PrevEventIDs: []string{membershipRes.EventID},
StateToFetch: []gomatrixserverlib.StateKeyTuple{},
}, &stateAfterRes)
if err != nil {
util.GetLogger(ctx).WithError(err).Error("Failed to QueryMembershipForUser")
return jsonerror.InternalServerError()
}
for _, ev := range stateRes.StateEvents {
stateEvents = append(
stateEvents,
gomatrixserverlib.HeaderedToClientEvent(ev, gomatrixserverlib.FormatAll),
)
}
}
// Return the results to the requestor.
return util.JSONResponse{
Code: http.StatusOK,
JSON: resp,
JSON: stateEvents,
}
}