PLT-4938 Add app package and move logic over from api package (#4931)

* Add app package and move logic over from api package

* Change app package functions to return errors

* Move non-api tests into app package

* Fix merge

api/webrtc.go

@@ -8,14 +8,16 @@ import (
 	"crypto/sha1"
 	"crypto/tls"
 	"encoding/base64"
-	l4g "github.com/alecthomas/log4go"
-	"github.com/mattermost/platform/model"
-	"github.com/mattermost/platform/utils"
 	"io/ioutil"
 	"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() {
@@ -23,7 +25,7 @@ func InitWebrtc() {
 
 	BaseRoutes.Webrtc.Handle("/token", ApiUserRequired(webrtcToken)).Methods("POST")
 
-	BaseRoutes.WebSocket.Handle("webrtc", ApiWebSocketHandler(webrtcMessage))
+	app.Srv.WebSocketRouter.Handle("webrtc", ApiWebSocketHandler(webrtcMessage))
 }
 
 func webrtcToken(c *Context, w http.ResponseWriter, r *http.Request) {
@@ -60,7 +62,7 @@ func webrtcMessage(req *model.WebSocketRequest) (map[string]interface{}, *model.
 
 	event := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_WEBRTC, "", "", toUserId, nil)
 	event.Data = req.Data
-	go Publish(event)
+	go app.Publish(event)
 
 	return nil, nil
 }