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// Copyright 2022 The Matrix.org Foundation C.I.C.
//
// 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 (
"fmt"
"net/http"
"time"
"github.com/getsentry/sentry-go"
"github.com/gorilla/mux"
"github.com/matrix-org/dendrite/internal/httputil"
relayInternal "github.com/matrix-org/dendrite/relayapi/internal"
"github.com/matrix-org/dendrite/setup/config"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/gomatrixserverlib/fclient"
"github.com/matrix-org/gomatrixserverlib/spec"
"github.com/matrix-org/util"
"github.com/sirupsen/logrus"
)
// Setup registers HTTP handlers with the given ServeMux.
// The provided publicAPIMux MUST have `UseEncodedPath()` enabled or else routes will incorrectly
// path unescape twice (once from the router, once from MakeRelayAPI). We need to have this enabled
// so we can decode paths like foo/bar%2Fbaz as [foo, bar/baz] - by default it will decode to [foo, bar, baz]
func Setup(
fedMux *mux.Router,
cfg *config.FederationAPI,
relayAPI *relayInternal.RelayInternalAPI,
keys gomatrixserverlib.JSONVerifier,
) {
v1fedmux := fedMux.PathPrefix("/v1").Subrouter()
v1fedmux.Handle("/send_relay/{txnID}/{userID}", MakeRelayAPI(
"send_relay_transaction", "", cfg.Matrix.IsLocalServerName, keys,
func(httpReq *http.Request, request *fclient.FederationRequest, vars map[string]string) util.JSONResponse {
logrus.Infof("Handling send_relay from: %s", request.Origin())
if !relayAPI.RelayingEnabled() {
logrus.Warnf("Dropping send_relay from: %s", request.Origin())
return util.JSONResponse{
Code: http.StatusNotFound,
}
}
userID, err := spec.NewUserID(vars["userID"], false)
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: spec.InvalidUsername("Username was invalid"),
}
}
return SendTransactionToRelay(
httpReq, request, relayAPI, gomatrixserverlib.TransactionID(vars["txnID"]),
*userID,
)
},
)).Methods(http.MethodPut, http.MethodOptions)
v1fedmux.Handle("/relay_txn/{userID}", MakeRelayAPI(
"get_relay_transaction", "", cfg.Matrix.IsLocalServerName, keys,
func(httpReq *http.Request, request *fclient.FederationRequest, vars map[string]string) util.JSONResponse {
logrus.Infof("Handling relay_txn from: %s", request.Origin())
if !relayAPI.RelayingEnabled() {
logrus.Warnf("Dropping relay_txn from: %s", request.Origin())
return util.JSONResponse{
Code: http.StatusNotFound,
}
}
userID, err := spec.NewUserID(vars["userID"], false)
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: spec.InvalidUsername("Username was invalid"),
}
}
return GetTransactionFromRelay(httpReq, request, relayAPI, *userID)
},
)).Methods(http.MethodGet, http.MethodOptions)
}
// MakeRelayAPI makes an http.Handler that checks matrix relay authentication.
func MakeRelayAPI(
metricsName string, serverName spec.ServerName,
isLocalServerName func(spec.ServerName) bool,
keyRing gomatrixserverlib.JSONVerifier,
f func(*http.Request, *fclient.FederationRequest, map[string]string) util.JSONResponse,
) http.Handler {
h := func(req *http.Request) util.JSONResponse {
fedReq, errResp := fclient.VerifyHTTPRequest(
req, time.Now(), serverName, isLocalServerName, keyRing,
)
if fedReq == nil {
return errResp
}
// add the user to Sentry, if enabled
hub := sentry.GetHubFromContext(req.Context())
if hub != nil {
hub.Scope().SetTag("origin", string(fedReq.Origin()))
hub.Scope().SetTag("uri", fedReq.RequestURI())
}
defer func() {
if r := recover(); r != nil {
if hub != nil {
hub.CaptureException(fmt.Errorf("%s panicked", req.URL.Path))
}
// re-panic to return the 500
panic(r)
}
}()
vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
if err != nil {
return util.MatrixErrorResponse(400, string(spec.ErrorUnrecognized), "badly encoded query params")
}
jsonRes := f(req, fedReq, vars)
// do not log 4xx as errors as they are client fails, not server fails
if hub != nil && jsonRes.Code >= 500 {
hub.Scope().SetExtra("response", jsonRes)
hub.CaptureException(fmt.Errorf("%s returned HTTP %d", req.URL.Path, jsonRes.Code))
}
return jsonRes
}
return httputil.MakeExternalAPI(metricsName, h)
}
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