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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 (
"context"
"encoding/json"
"fmt"
"net/http"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/setup/config"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/gomatrixserverlib/fclient"
"github.com/matrix-org/util"
)
// InviteV2 implements /_matrix/federation/v2/invite/{roomID}/{eventID}
func InviteV2(
httpReq *http.Request,
request *fclient.FederationRequest,
roomID string,
eventID string,
cfg *config.FederationAPI,
rsAPI api.FederationRoomserverAPI,
keys gomatrixserverlib.JSONVerifier,
) util.JSONResponse {
inviteReq := fclient.InviteV2Request{}
err := json.Unmarshal(request.Content(), &inviteReq)
switch e := err.(type) {
case gomatrixserverlib.UnsupportedRoomVersionError:
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.UnsupportedRoomVersion(
fmt.Sprintf("Room version %q is not supported by this server.", e.Version),
),
}
case gomatrixserverlib.BadJSONError:
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON(err.Error()),
}
case nil:
return processInvite(
httpReq.Context(), true, inviteReq.Event(), inviteReq.RoomVersion(), inviteReq.InviteRoomState(), roomID, eventID, cfg, rsAPI, keys,
)
default:
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.NotJSON("The request body could not be decoded into an invite request. " + err.Error()),
}
}
}
// InviteV1 implements /_matrix/federation/v1/invite/{roomID}/{eventID}
func InviteV1(
httpReq *http.Request,
request *fclient.FederationRequest,
roomID string,
eventID string,
cfg *config.FederationAPI,
rsAPI api.FederationRoomserverAPI,
keys gomatrixserverlib.JSONVerifier,
) util.JSONResponse {
roomVer := gomatrixserverlib.RoomVersionV1
body := request.Content()
event, err := gomatrixserverlib.MustGetRoomVersion(roomVer).NewEventFromTrustedJSON(body, false)
switch err.(type) {
case gomatrixserverlib.BadJSONError:
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON(err.Error()),
}
case nil:
default:
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.NotJSON("The request body could not be decoded into an invite v1 request. " + err.Error()),
}
}
var strippedState []fclient.InviteV2StrippedState
if err := json.Unmarshal(event.Unsigned(), &strippedState); err != nil {
// just warn, they may not have added any.
util.GetLogger(httpReq.Context()).Warnf("failed to extract stripped state from invite event")
}
return processInvite(
httpReq.Context(), false, event, roomVer, strippedState, roomID, eventID, cfg, rsAPI, keys,
)
}
func processInvite(
ctx context.Context,
isInviteV2 bool,
event *gomatrixserverlib.Event,
roomVer gomatrixserverlib.RoomVersion,
strippedState []fclient.InviteV2StrippedState,
roomID string,
eventID string,
cfg *config.FederationAPI,
rsAPI api.FederationRoomserverAPI,
keys gomatrixserverlib.JSONVerifier,
) util.JSONResponse {
// Check that we can accept invites for this room version.
verImpl, err := gomatrixserverlib.GetRoomVersion(roomVer)
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.UnsupportedRoomVersion(
fmt.Sprintf("Room version %q is not supported by this server.", roomVer),
),
}
}
// Check that the room ID is correct.
if event.RoomID() != roomID {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("The room ID in the request path must match the room ID in the invite event JSON"),
}
}
// Check that the event ID is correct.
if event.EventID() != eventID {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("The event ID in the request path must match the event ID in the invite event JSON"),
}
}
if event.StateKey() == nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("The invite event has no state key"),
}
}
_, domain, err := cfg.Matrix.SplitLocalID('@', *event.StateKey())
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.InvalidArgumentValue(fmt.Sprintf("The user ID is invalid or domain %q does not belong to this server", domain)),
}
}
// Check that the event is signed by the server sending the request.
redacted, err := verImpl.RedactEventJSON(event.JSON())
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("The event JSON could not be redacted"),
}
}
_, serverName, err := gomatrixserverlib.SplitID('@', event.Sender())
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("The event JSON contains an invalid sender"),
}
}
verifyRequests := []gomatrixserverlib.VerifyJSONRequest{{
ServerName: serverName,
Message: redacted,
AtTS: event.OriginServerTS(),
StrictValidityChecking: true,
}}
verifyResults, err := keys.VerifyJSONs(ctx, verifyRequests)
if err != nil {
util.GetLogger(ctx).WithError(err).Error("keys.VerifyJSONs failed")
return jsonerror.InternalServerError()
}
if verifyResults[0].Error != nil {
return util.JSONResponse{
Code: http.StatusForbidden,
JSON: jsonerror.Forbidden("The invite must be signed by the server it originated on"),
}
}
// Sign the event so that other servers will know that we have received the invite.
signedEvent := event.Sign(
string(domain), cfg.Matrix.KeyID, cfg.Matrix.PrivateKey,
)
// Add the invite event to the roomserver.
inviteEvent := signedEvent.Headered(roomVer)
request := &api.PerformInviteRequest{
Event: inviteEvent,
InviteRoomState: strippedState,
RoomVersion: inviteEvent.RoomVersion,
SendAsServer: string(api.DoNotSendToOtherServers),
TransactionID: nil,
}
response := &api.PerformInviteResponse{}
if err := rsAPI.PerformInvite(ctx, request, response); err != nil {
util.GetLogger(ctx).WithError(err).Error("PerformInvite failed")
return util.JSONResponse{
Code: http.StatusInternalServerError,
JSON: jsonerror.InternalServerError(),
}
}
if response.Error != nil {
return response.Error.JSONResponse()
}
// Return the signed event to the originating server, it should then tell
// the other servers in the room that we have been invited.
if isInviteV2 {
return util.JSONResponse{
Code: http.StatusOK,
JSON: fclient.RespInviteV2{Event: signedEvent.JSON()},
}
} else {
return util.JSONResponse{
Code: http.StatusOK,
JSON: fclient.RespInvite{Event: signedEvent.JSON()},
}
}
}
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