1 files changed, 78 insertions, 0 deletions
diff --git a/clientapi/routing/voip.go b/clientapi/routing/voip.go
new file mode 100644
index 00000000..b9121633
--- /dev/null
+++ b/clientapi/routing/voip.go
@@ -0,0 +1,78 @@
+// Copyright 2017 Michael Telatysnki <7t3chguy@gmail.com>
+//
+// 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 (
+	"crypto/hmac"
+	"crypto/sha1"
+	"encoding/base64"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/clientapi/httputil"
+	"github.com/matrix-org/dendrite/common/config"
+	"github.com/matrix-org/gomatrix"
+	"github.com/matrix-org/util"
+)
+
+// RequestTurnServer implements:
+//     GET /voip/turnServer
+func RequestTurnServer(req *http.Request, device *authtypes.Device, cfg config.Dendrite) util.JSONResponse {
+	turnConfig := cfg.TURN
+
+	// TODO Guest Support
+	if len(turnConfig.URIs) == 0 || turnConfig.UserLifetime == "" {
+		return util.JSONResponse{
+			Code: http.StatusOK,
+			JSON: struct{}{},
+		}
+	}
+
+	// Duration checked at startup, err not possible
+	duration, _ := time.ParseDuration(turnConfig.UserLifetime)
+
+	resp := gomatrix.RespTurnServer{
+		URIs: turnConfig.URIs,
+		TTL:  int(duration.Seconds()),
+	}
+
+	if turnConfig.SharedSecret != "" {
+		expiry := time.Now().Add(duration).Unix()
+		mac := hmac.New(sha1.New, []byte(turnConfig.SharedSecret))
+		_, err := mac.Write([]byte(resp.Username))
+
+		if err != nil {
+			return httputil.LogThenError(req, err)
+		}
+
+		resp.Username = fmt.Sprintf("%d:%s", expiry, device.UserID)
+		resp.Password = base64.StdEncoding.EncodeToString(mac.Sum(nil))
+	} else if turnConfig.Username != "" && turnConfig.Password != "" {
+		resp.Username = turnConfig.Username
+		resp.Password = turnConfig.Password
+	} else {
+		return util.JSONResponse{
+			Code: http.StatusOK,
+			JSON: struct{}{},
+		}
+	}
+
+	return util.JSONResponse{
+		Code: http.StatusOK,
+		JSON: resp,
+	}
+}