Maint: common GetPort for OpenVPN+Wireguard providers

internal/provider/utils/port.go

@@ -0,0 +1,27 @@
+package utils
+
+import (
+	"github.com/qdm12/gluetun/internal/configuration"
+	"github.com/qdm12/gluetun/internal/constants"
+)
+
+func GetPort(selection configuration.ServerSelection,
+	defaultOpenVPNTCP, defaultOpenVPNUDP, defaultWireguard uint16) (port uint16) {
+	switch selection.VPN {
+	case constants.Wireguard:
+		customPort := selection.Wireguard.CustomPort
+		if customPort > 0 {
+			return customPort
+		}
+		return defaultWireguard
+	default: // OpenVPN
+		customPort := selection.OpenVPN.CustomPort
+		if customPort > 0 {
+			return customPort
+		}
+		if selection.OpenVPN.TCP {
+			return defaultOpenVPNTCP
+		}
+		return defaultOpenVPNUDP
+	}
+}