github.com/coincircle/mattermost-server@v4.8.1-0.20180321182714-9d701c704416+incompatible/app/webrtc.go (about)

     1  // Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
     2  // See License.txt for license information.
     3  
     4  package app
     5  
     6  import (
     7  	"crypto/hmac"
     8  	"crypto/sha1"
     9  	"encoding/base64"
    10  	"net/http"
    11  	"strconv"
    12  	"strings"
    13  	"time"
    14  
    15  	"github.com/mattermost/mattermost-server/model"
    16  	"github.com/mattermost/mattermost-server/utils"
    17  )
    18  
    19  func (a *App) GetWebrtcInfoForSession(sessionId string) (*model.WebrtcInfoResponse, *model.AppError) {
    20  	token, err := a.GetWebrtcToken(sessionId)
    21  	if err != nil {
    22  		return nil, err
    23  	}
    24  
    25  	result := &model.WebrtcInfoResponse{
    26  		Token:      token,
    27  		GatewayUrl: *a.Config().WebrtcSettings.GatewayWebsocketUrl,
    28  	}
    29  
    30  	if len(*a.Config().WebrtcSettings.StunURI) > 0 {
    31  		result.StunUri = *a.Config().WebrtcSettings.StunURI
    32  	}
    33  
    34  	if len(*a.Config().WebrtcSettings.TurnURI) > 0 {
    35  		timestamp := strconv.FormatInt(utils.EndOfDay(time.Now().AddDate(0, 0, 1)).Unix(), 10)
    36  		username := timestamp + ":" + *a.Config().WebrtcSettings.TurnUsername
    37  
    38  		result.TurnUri = *a.Config().WebrtcSettings.TurnURI
    39  		result.TurnPassword = GenerateTurnPassword(username, *a.Config().WebrtcSettings.TurnSharedKey)
    40  		result.TurnUsername = username
    41  	}
    42  
    43  	return result, nil
    44  }
    45  
    46  func (a *App) GetWebrtcToken(sessionId string) (string, *model.AppError) {
    47  	if !*a.Config().WebrtcSettings.Enable {
    48  		return "", model.NewAppError("WebRTC.getWebrtcToken", "api.webrtc.disabled.app_error", nil, "", http.StatusNotImplemented)
    49  	}
    50  
    51  	token := base64.StdEncoding.EncodeToString([]byte(sessionId))
    52  
    53  	data := make(map[string]string)
    54  	data["janus"] = "add_token"
    55  	data["token"] = token
    56  	data["transaction"] = model.NewId()
    57  	data["admin_secret"] = *a.Config().WebrtcSettings.GatewayAdminSecret
    58  
    59  	rq, _ := http.NewRequest("POST", *a.Config().WebrtcSettings.GatewayAdminUrl, strings.NewReader(model.MapToJson(data)))
    60  	rq.Header.Set("Content-Type", "application/json")
    61  
    62  	if rp, err := a.HTTPClient(true).Do(rq); err != nil {
    63  		return "", model.NewAppError("WebRTC.Token", "model.client.connecting.app_error", nil, err.Error(), http.StatusInternalServerError)
    64  	} else if rp.StatusCode >= 300 {
    65  		defer consumeAndClose(rp)
    66  		return "", model.AppErrorFromJson(rp.Body)
    67  	} else {
    68  		janusResponse := model.GatewayResponseFromJson(rp.Body)
    69  		if janusResponse.Status != "success" {
    70  			return "", model.NewAppError("getWebrtcToken", "api.webrtc.register_token.app_error", nil, "", http.StatusInternalServerError)
    71  		}
    72  	}
    73  
    74  	return token, nil
    75  }
    76  
    77  func GenerateTurnPassword(username string, secret string) string {
    78  	key := []byte(secret)
    79  	h := hmac.New(sha1.New, key)
    80  	h.Write([]byte(username))
    81  	return base64.StdEncoding.EncodeToString(h.Sum(nil))
    82  }
    83  
    84  func (a *App) RevokeWebrtcToken(sessionId string) {
    85  	token := base64.StdEncoding.EncodeToString([]byte(sessionId))
    86  	data := make(map[string]string)
    87  	data["janus"] = "remove_token"
    88  	data["token"] = token
    89  	data["transaction"] = model.NewId()
    90  	data["admin_secret"] = *a.Config().WebrtcSettings.GatewayAdminSecret
    91  
    92  	rq, _ := http.NewRequest("POST", *a.Config().WebrtcSettings.GatewayAdminUrl, strings.NewReader(model.MapToJson(data)))
    93  	rq.Header.Set("Content-Type", "application/json")
    94  
    95  	// we do not care about the response
    96  	a.HTTPClient(true).Do(rq)
    97  }