289 lines
9.0 KiB
Go
289 lines
9.0 KiB
Go
// Copyright 2017 New Vector 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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"fmt"
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"net/http"
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"time"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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"github.com/matrix-org/dendrite/clientapi/producers"
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"github.com/matrix-org/dendrite/common"
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"github.com/matrix-org/dendrite/common/config"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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)
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// MakeJoin implements the /make_join API
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func MakeJoin(
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httpReq *http.Request,
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request *gomatrixserverlib.FederationRequest,
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cfg *config.Dendrite,
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rsAPI api.RoomserverInternalAPI,
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roomID, userID string,
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remoteVersions []gomatrixserverlib.RoomVersion,
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) util.JSONResponse {
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verReq := api.QueryRoomVersionForRoomRequest{RoomID: roomID}
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verRes := api.QueryRoomVersionForRoomResponse{}
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if err := rsAPI.QueryRoomVersionForRoom(httpReq.Context(), &verReq, &verRes); err != nil {
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: jsonerror.InternalServerError(),
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}
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}
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// Check that the room that the remote side is trying to join is actually
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// one of the room versions that they listed in their supported ?ver= in
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// the make_join URL.
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// https://matrix.org/docs/spec/server_server/r0.1.3#get-matrix-federation-v1-make-join-roomid-userid
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remoteSupportsVersion := false
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for _, v := range remoteVersions {
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if v == verRes.RoomVersion {
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remoteSupportsVersion = true
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break
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}
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}
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// If it isn't, stop trying to join the room.
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if !remoteSupportsVersion {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.IncompatibleRoomVersion(verRes.RoomVersion),
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}
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}
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_, domain, err := gomatrixserverlib.SplitID('@', userID)
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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: jsonerror.BadJSON("Invalid UserID"),
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}
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}
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if domain != request.Origin() {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden("The join must be sent by the server of the user"),
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}
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}
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// Try building an event for the server
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builder := gomatrixserverlib.EventBuilder{
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Sender: userID,
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RoomID: roomID,
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Type: "m.room.member",
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StateKey: &userID,
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}
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err = builder.SetContent(map[string]interface{}{"membership": gomatrixserverlib.Join})
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if err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("builder.SetContent failed")
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return jsonerror.InternalServerError()
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}
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queryRes := api.QueryLatestEventsAndStateResponse{
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RoomVersion: verRes.RoomVersion,
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}
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event, err := common.BuildEvent(httpReq.Context(), &builder, cfg, time.Now(), rsAPI, &queryRes)
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if err == common.ErrRoomNoExists {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("Room does not exist"),
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}
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} else if err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("common.BuildEvent failed")
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return jsonerror.InternalServerError()
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}
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// Check that the join is allowed or not
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stateEvents := make([]*gomatrixserverlib.Event, len(queryRes.StateEvents))
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for i := range queryRes.StateEvents {
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stateEvents[i] = &queryRes.StateEvents[i].Event
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}
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provider := gomatrixserverlib.NewAuthEvents(stateEvents)
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if err = gomatrixserverlib.Allowed(*event, &provider); err != nil {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden(err.Error()),
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}
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}
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: map[string]interface{}{
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"event": builder,
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"room_version": verRes.RoomVersion,
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},
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}
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}
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// SendJoin implements the /send_join API
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// The make-join send-join dance makes much more sense as a single
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// flow so the cyclomatic complexity is high:
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// nolint:gocyclo
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func SendJoin(
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httpReq *http.Request,
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request *gomatrixserverlib.FederationRequest,
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cfg *config.Dendrite,
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rsAPI api.RoomserverInternalAPI,
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producer *producers.RoomserverProducer,
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keys gomatrixserverlib.KeyRing,
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roomID, eventID string,
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) util.JSONResponse {
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verReq := api.QueryRoomVersionForRoomRequest{RoomID: roomID}
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verRes := api.QueryRoomVersionForRoomResponse{}
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if err := rsAPI.QueryRoomVersionForRoom(httpReq.Context(), &verReq, &verRes); err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("rsAPI.QueryRoomVersionForRoom failed")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: jsonerror.InternalServerError(),
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}
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}
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event, err := gomatrixserverlib.NewEventFromUntrustedJSON(request.Content(), verRes.RoomVersion)
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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: jsonerror.NotJSON("The request body could not be decoded into valid JSON. " + err.Error()),
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}
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}
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// Check that a state key is provided.
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if event.StateKey() == nil || (event.StateKey() != nil && *event.StateKey() == "") {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON(
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fmt.Sprintf("No state key was provided in the join event."),
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),
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}
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}
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// Check that the room ID is correct.
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if event.RoomID() != roomID {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON(
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fmt.Sprintf(
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"The room ID in the request path (%q) must match the room ID in the join event JSON (%q)",
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roomID, event.RoomID(),
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),
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),
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}
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}
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// Check that the event ID is correct.
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if event.EventID() != eventID {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON(
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fmt.Sprintf(
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"The event ID in the request path (%q) must match the event ID in the join event JSON (%q)",
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eventID, event.EventID(),
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),
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),
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}
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}
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// Check that the event is from the server sending the request.
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if event.Origin() != request.Origin() {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden("The join must be sent by the server it originated on"),
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}
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}
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// Check that the event is signed by the server sending the request.
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redacted := event.Redact()
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verifyRequests := []gomatrixserverlib.VerifyJSONRequest{{
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ServerName: event.Origin(),
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Message: redacted.JSON(),
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AtTS: event.OriginServerTS(),
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StrictValidityChecking: true,
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}}
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verifyResults, err := keys.VerifyJSONs(httpReq.Context(), verifyRequests)
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if err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("keys.VerifyJSONs failed")
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return jsonerror.InternalServerError()
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}
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if verifyResults[0].Error != nil {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden("Signature check failed: " + verifyResults[0].Error.Error()),
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}
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}
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// Fetch the state and auth chain. We do this before we send the events
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// on, in case this fails.
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var stateAndAuthChainResponse api.QueryStateAndAuthChainResponse
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err = rsAPI.QueryStateAndAuthChain(httpReq.Context(), &api.QueryStateAndAuthChainRequest{
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PrevEventIDs: event.PrevEventIDs(),
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AuthEventIDs: event.AuthEventIDs(),
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RoomID: roomID,
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ResolveState: true,
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}, &stateAndAuthChainResponse)
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if err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("rsAPI.QueryStateAndAuthChain failed")
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return jsonerror.InternalServerError()
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}
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if !stateAndAuthChainResponse.RoomExists {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("Room does not exist"),
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}
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}
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// Check if the user is already in the room. If they're already in then
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// there isn't much point in sending another join event into the room.
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alreadyJoined := false
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for _, se := range stateAndAuthChainResponse.StateEvents {
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if membership, merr := se.Membership(); merr == nil {
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if se.StateKey() != nil && *se.StateKey() == *event.StateKey() {
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alreadyJoined = (membership == "join")
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break
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}
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}
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}
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// Send the events to the room server.
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// We are responsible for notifying other servers that the user has joined
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// the room, so set SendAsServer to cfg.Matrix.ServerName
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if !alreadyJoined {
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_, err = producer.SendEvents(
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httpReq.Context(),
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[]gomatrixserverlib.HeaderedEvent{
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event.Headered(stateAndAuthChainResponse.RoomVersion),
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},
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cfg.Matrix.ServerName,
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nil,
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)
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if err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("producer.SendEvents failed")
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return jsonerror.InternalServerError()
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}
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}
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: gomatrixserverlib.RespSendJoin{
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RespState: gomatrixserverlib.RespState{
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StateEvents: gomatrixserverlib.UnwrapEventHeaders(stateAndAuthChainResponse.StateEvents),
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AuthEvents: gomatrixserverlib.UnwrapEventHeaders(stateAndAuthChainResponse.AuthChainEvents),
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},
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Origin: cfg.Matrix.ServerName,
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},
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}
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}
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