chore(internal/provider/utils): unexport functions

internal/provider/utils/port.go

@@ -1,15 +1,13 @@
 package utils
 
 import (
-	"errors"
 	"fmt"
 
 	"github.com/qdm12/gluetun/internal/configuration/settings"
-	"github.com/qdm12/gluetun/internal/constants"
 	"github.com/qdm12/gluetun/internal/constants/vpn"
 )
 
-func GetPort(selection settings.ServerSelection,
+func getPort(selection settings.ServerSelection,
 	defaultOpenVPNTCP, defaultOpenVPNUDP, defaultWireguard uint16) (port uint16) {
 	switch selection.VPN {
 	case vpn.Wireguard:
@@ -41,24 +39,3 @@ func checkDefined(portName string, port uint16) {
 	message := fmt.Sprintf("no default %s port is defined!", portName)
 	panic(message)
 }
-
-var ErrInvalidPort = errors.New("invalid port number")
-
-// CheckPortAllowed for custom port used for OpenVPN.
-func CheckPortAllowed(port uint16, tcp bool,
-	allowedTCP, allowedUDP []uint16) (err error) {
-	allowedPorts := allowedUDP
-	protocol := constants.UDP
-	if tcp {
-		allowedPorts = allowedTCP
-		protocol = constants.TCP
-	}
-	for _, allowedPort := range allowedPorts {
-		if port == allowedPort {
-			return nil
-		}
-	}
-
-	return fmt.Errorf("%w: %d for protocol %s",
-		ErrInvalidPort, port, protocol)
-}