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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package routing
import (
"context"
"net/http"
"net/url"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib/fclient"
"github.com/matrix-org/gomatrixserverlib/spec"
"github.com/matrix-org/util"
)
// GetState returns state events & auth events for the roomID, eventID
func GetState(
ctx context.Context,
request *fclient.FederationRequest,
rsAPI api.FederationRoomserverAPI,
roomID string,
) util.JSONResponse {
eventID, err := parseEventIDParam(request)
if err != nil {
return *err
}
stateEvents, authChain, err := getState(ctx, request, rsAPI, roomID, eventID)
if err != nil {
return *err
}
return util.JSONResponse{Code: http.StatusOK, JSON: &fclient.RespState{
AuthEvents: types.NewEventJSONsFromHeaderedEvents(authChain),
StateEvents: types.NewEventJSONsFromHeaderedEvents(stateEvents),
}}
}
// GetStateIDs returns state event IDs & auth event IDs for the roomID, eventID
func GetStateIDs(
ctx context.Context,
request *fclient.FederationRequest,
rsAPI api.FederationRoomserverAPI,
roomID string,
) util.JSONResponse {
eventID, err := parseEventIDParam(request)
if err != nil {
return *err
}
stateEvents, authEvents, err := getState(ctx, request, rsAPI, roomID, eventID)
if err != nil {
return *err
}
stateEventIDs := getIDsFromEvent(stateEvents)
authEventIDs := getIDsFromEvent(authEvents)
return util.JSONResponse{Code: http.StatusOK, JSON: fclient.RespStateIDs{
StateEventIDs: stateEventIDs,
AuthEventIDs: authEventIDs,
},
}
}
func parseEventIDParam(
request *fclient.FederationRequest,
) (eventID string, resErr *util.JSONResponse) {
URL, err := url.Parse(request.RequestURI())
if err != nil {
response := util.ErrorResponse(err)
resErr = &response
return
}
eventID = URL.Query().Get("event_id")
if eventID == "" {
resErr = &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: spec.MissingParam("event_id missing"),
}
}
return
}
func getState(
ctx context.Context,
request *fclient.FederationRequest,
rsAPI api.FederationRoomserverAPI,
roomID string,
eventID string,
) (stateEvents, authEvents []*types.HeaderedEvent, errRes *util.JSONResponse) {
// If we don't think we belong to this room then don't waste the effort
// responding to expensive requests for it.
if err := ErrorIfLocalServerNotInRoom(ctx, rsAPI, roomID); err != nil {
return nil, nil, err
}
event, resErr := fetchEvent(ctx, rsAPI, roomID, eventID)
if resErr != nil {
return nil, nil, resErr
}
if event.RoomID() != roomID {
return nil, nil, &util.JSONResponse{Code: http.StatusNotFound, JSON: spec.NotFound("event does not belong to this room")}
}
resErr = allowedToSeeEvent(ctx, request.Origin(), rsAPI, eventID, event.RoomID())
if resErr != nil {
return nil, nil, resErr
}
var response api.QueryStateAndAuthChainResponse
err := rsAPI.QueryStateAndAuthChain(
ctx,
&api.QueryStateAndAuthChainRequest{
RoomID: roomID,
PrevEventIDs: []string{eventID},
AuthEventIDs: event.AuthEventIDs(),
},
&response,
)
if err != nil {
resErr := util.ErrorResponse(err)
return nil, nil, &resErr
}
switch {
case !response.RoomExists:
return nil, nil, &util.JSONResponse{
Code: http.StatusNotFound,
JSON: spec.NotFound("Room not found"),
}
case !response.StateKnown:
return nil, nil, &util.JSONResponse{
Code: http.StatusNotFound,
JSON: spec.NotFound("State not known"),
}
case response.IsRejected:
return nil, nil, &util.JSONResponse{
Code: http.StatusNotFound,
JSON: spec.NotFound("Event not found"),
}
}
return response.StateEvents, response.AuthChainEvents, nil
}
func getIDsFromEvent(events []*types.HeaderedEvent) []string {
IDs := make([]string, len(events))
for i := range events {
IDs[i] = events[i].EventID()
}
return IDs
}
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