Add support CORS for API

cmd/api/ws.go

@@ -4,35 +4,19 @@ import (
 	"github.com/AlexxIT/go2rtc/pkg/streamer"
 	"github.com/gorilla/websocket"
 	"net/http"
-	"net/url"
-	"strings"
 	"sync"
 )
 
-func initWS() {
+func initWS(origin string) {
 	wsUp = &websocket.Upgrader{
 		ReadBufferSize:  1024,
 		WriteBufferSize: 512000,
 	}
-	wsUp.CheckOrigin = func(r *http.Request) bool {
-		origin := r.Header["Origin"]
-		if len(origin) == 0 {
+
+	if origin == "*" {
+		wsUp.CheckOrigin = func(r *http.Request) bool {
 			return true
 		}
-		o, err := url.Parse(origin[0])
-		if err != nil {
-			return false
-		}
-		if o.Host == r.Host {
-			return true
-		}
-		log.Trace().Msgf("[api.ws] origin: %s, host: %s", o.Host, r.Host)
-		// some users change Nginx external port using Docker port
-		// so origin will be with a port and host without
-		if i := strings.IndexByte(o.Host, ':'); i > 0 {
-			return o.Host[:i] == r.Host
-		}
-		return false
 	}
 }