summaryrefslogtreecommitdiffstats
path: root/api/webrtc.go
blob: 7ba9d37621b1d884a72bc2c9ef61a6fc22da5609 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

package api

import (
	"crypto/hmac"
	"crypto/sha1"
	"crypto/tls"
	"encoding/base64"
	"net/http"
	"strconv"
	"strings"
	"time"

	l4g "github.com/alecthomas/log4go"
	"github.com/mattermost/platform/app"
	"github.com/mattermost/platform/model"
	"github.com/mattermost/platform/utils"
)

func InitWebrtc() {
	l4g.Debug(utils.T("api.webrtc.init.debug"))

	BaseRoutes.Webrtc.Handle("/token", ApiUserRequired(webrtcToken)).Methods("POST")
}

func webrtcToken(c *Context, w http.ResponseWriter, r *http.Request) {
	if token, err := getWebrtcToken(c.Session.Id); err != nil {
		c.Err = err
		return
	} else {
		result := make(map[string]string)
		result["token"] = token
		result["gateway_url"] = *utils.Cfg.WebrtcSettings.GatewayWebsocketUrl

		if len(*utils.Cfg.WebrtcSettings.StunURI) > 0 {
			result["stun_uri"] = *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["turn_uri"] = *utils.Cfg.WebrtcSettings.TurnURI
			result["turn_password"] = generateTurnPassword(username, *utils.Cfg.WebrtcSettings.TurnSharedKey)
			result["turn_username"] = username
		}
		w.Write([]byte(model.MapToJson(result)))
	}
}

func getWebrtcToken(sessionId string) (string, *model.AppError) {
	if !*utils.Cfg.WebrtcSettings.Enable {
		return "", model.NewLocAppError("WebRTC.getWebrtcToken", "api.webrtc.disabled.app_error", nil, "")
	}

	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.NewLocAppError("WebRTC.Token", "model.client.connecting.app_error", nil, err.Error())
	} else if rp.StatusCode >= 300 {
		defer app.CloseBody(rp)
		return "", model.AppErrorFromJson(rp.Body)
	} else {
		janusResponse := model.GatewayResponseFromJson(rp.Body)
		if janusResponse.Status != "success" {
			return "", model.NewLocAppError("getWebrtcToken", "api.webrtc.register_token.app_error", nil, "")
		}
	}

	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))
}