dendrite/syncapi/routing/state.go

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// Copyright 2017 Vector Creations Ltd
//
// 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 (
"encoding/json"
"net/http"
"github.com/matrix-org/dendrite/clientapi/httputil"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/syncapi/storage"
"github.com/matrix-org/dendrite/syncapi/types"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
log "github.com/sirupsen/logrus"
)
type stateEventInStateResp struct {
gomatrixserverlib.ClientEvent
PrevContent json.RawMessage `json:"prev_content,omitempty"`
ReplacesState string `json:"replaces_state,omitempty"`
}
// OnIncomingStateRequest is called when a client makes a /rooms/{roomID}/state
// request. It will fetch all the state events from the specified room and will
// append the necessary keys to them if applicable before returning them.
// Returns an error if something went wrong in the process.
// 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(req *http.Request, db storage.Database, 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)
stateFilterPart := gomatrixserverlib.DefaultFilterPart()
// TODO: stateFilterPart should not limit the number of state events (or only limits abusive number of events)
stateEvents, err := db.GetStateEventsForRoom(req.Context(), roomID, &stateFilterPart)
if err != nil {
return httputil.LogThenError(req, err)
}
resp := []stateEventInStateResp{}
// Fill the prev_content and replaces_state keys if necessary
for _, event := range stateEvents {
stateEvent := stateEventInStateResp{
ClientEvent: gomatrixserverlib.ToClientEvent(event, gomatrixserverlib.FormatAll),
}
var prevEventRef types.PrevEventRef
if len(event.Unsigned()) > 0 {
if err := json.Unmarshal(event.Unsigned(), &prevEventRef); err != nil {
return httputil.LogThenError(req, err)
}
// Fills the previous state event ID if the state event replaces another
// state event
if len(prevEventRef.ReplacesState) > 0 {
stateEvent.ReplacesState = prevEventRef.ReplacesState
}
// Fill the previous event if the state event references a previous event
if prevEventRef.PrevContent != nil {
stateEvent.PrevContent = prevEventRef.PrevContent
}
}
resp = append(resp, stateEvent)
}
return util.JSONResponse{
Code: http.StatusOK,
JSON: resp,
}
}
// OnIncomingStateTypeRequest is called when a client makes a
// /rooms/{roomID}/state/{type}/{statekey} request. It will look in current
// state to see if there is an event with that type and state key, if there
// is then (by default) we return the content, otherwise a 404.
func OnIncomingStateTypeRequest(req *http.Request, db storage.Database, roomID string, evType, stateKey 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)
logger := util.GetLogger(req.Context())
logger.WithFields(log.Fields{
"roomID": roomID,
"evType": evType,
"stateKey": stateKey,
}).Info("Fetching state")
event, err := db.GetStateEvent(req.Context(), roomID, evType, stateKey)
if err != nil {
return httputil.LogThenError(req, err)
}
if event == nil {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound("cannot find state"),
}
}
stateEvent := stateEventInStateResp{
ClientEvent: gomatrixserverlib.ToClientEvent(*event, gomatrixserverlib.FormatAll),
}
return util.JSONResponse{
Code: http.StatusOK,
JSON: stateEvent.Content,
}
}