From 74ffb6f98f7ee8b4e61743919ab20460c57ad4da Mon Sep 17 00:00:00 2001
From: Joram Wilander <jwawilander@gmail.com>
Date: Sun, 16 Apr 2017 21:14:31 -0400
Subject: Implement GET /webrtc/token endpoint for APIv4 (#6046)

---
 app/webrtc.go | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 app/webrtc.go

(limited to 'app/webrtc.go')

diff --git a/app/webrtc.go b/app/webrtc.go
new file mode 100644
index 000000000..6692fff60
--- /dev/null
+++ b/app/webrtc.go
@@ -0,0 +1,87 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"crypto/hmac"
+	"crypto/sha1"
+	"crypto/tls"
+	"encoding/base64"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/utils"
+)
+
+func GetWebrtcInfoForSession(sessionId string) (*model.WebrtcInfoResponse, *model.AppError) {
+	token, err := GetWebrtcToken(sessionId)
+	if err != nil {
+		return nil, err
+	}
+
+	result := &model.WebrtcInfoResponse{
+		Token:      token,
+		GatewayUrl: *utils.Cfg.WebrtcSettings.GatewayWebsocketUrl,
+	}
+
+	if len(*utils.Cfg.WebrtcSettings.StunURI) > 0 {
+		result.StunUri = *utils.Cfg.WebrtcSettings.StunURI
+	}
+
+	if len(*utils.Cfg.WebrtcSettings.TurnURI) > 0 {
+		timestamp := strconv.FormatInt(utils.EndOfDay(time.Now().AddDate(0, 0, 1)).Unix(), 10)
+		username := timestamp + ":" + *utils.Cfg.WebrtcSettings.TurnUsername
+
+		result.TurnUri = *utils.Cfg.WebrtcSettings.TurnURI
+		result.TurnPassword = GenerateTurnPassword(username, *utils.Cfg.WebrtcSettings.TurnSharedKey)
+		result.TurnUsername = username
+	}
+
+	return result, nil
+}
+
+func GetWebrtcToken(sessionId string) (string, *model.AppError) {
+	if !*utils.Cfg.WebrtcSettings.Enable {
+		return "", model.NewAppError("WebRTC.getWebrtcToken", "api.webrtc.disabled.app_error", nil, "", http.StatusNotImplemented)
+	}
+
+	token := base64.StdEncoding.EncodeToString([]byte(sessionId))
+
+	data := make(map[string]string)
+	data["janus"] = "add_token"
+	data["token"] = token
+	data["transaction"] = model.NewId()
+	data["admin_secret"] = *utils.Cfg.WebrtcSettings.GatewayAdminSecret
+
+	rq, _ := http.NewRequest("POST", *utils.Cfg.WebrtcSettings.GatewayAdminUrl, strings.NewReader(model.MapToJson(data)))
+	rq.Header.Set("Content-Type", "application/json")
+
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: *utils.Cfg.ServiceSettings.EnableInsecureOutgoingConnections},
+	}
+	httpClient := &http.Client{Transport: tr}
+	if rp, err := httpClient.Do(rq); err != nil {
+		return "", model.NewAppError("WebRTC.Token", "model.client.connecting.app_error", nil, err.Error(), http.StatusInternalServerError)
+	} else if rp.StatusCode >= 300 {
+		defer CloseBody(rp)
+		return "", model.AppErrorFromJson(rp.Body)
+	} else {
+		janusResponse := model.GatewayResponseFromJson(rp.Body)
+		if janusResponse.Status != "success" {
+			return "", model.NewAppError("getWebrtcToken", "api.webrtc.register_token.app_error", nil, "", http.StatusInternalServerError)
+		}
+	}
+
+	return token, nil
+}
+
+func GenerateTurnPassword(username string, secret string) string {
+	key := []byte(secret)
+	h := hmac.New(sha1.New, key)
+	h.Write([]byte(username))
+	return base64.StdEncoding.EncodeToString(h.Sum(nil))
+}
-- 
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