hotfix(surfshark): REGION retro-compatibility

internal/configuration/settings/provider.go

@@ -21,7 +21,8 @@ type Provider struct {
 	PortForwarding PortForwarding
 }
 
-func (p Provider) validate(vpnType string, allServers models.AllServers) (err error) {
+// TODO v4 remove pointer for receiver (because of Surfshark).
+func (p *Provider) validate(vpnType string, allServers models.AllServers) (err error) {
 	// Validate Name
 	var validNames []string
 	if vpnType == constants.OpenVPN {

internal/configuration/settings/settings.go

@@ -22,7 +22,10 @@ type Settings struct {
 	VPN           VPN
 }
 
-func (s Settings) Validate(allServers models.AllServers) (err error) {
+// Validate validates all the settings and returns an error
+// if one of them is not valid.
+// TODO v4 remove pointer for receiver (because of Surfshark).
+func (s *Settings) Validate(allServers models.AllServers) (err error) {
 	nameToValidation := map[string]func() error{
 		"control server":  s.ControlServer.validate,
 		"dns":             s.DNS.validate,

internal/configuration/settings/vpn.go

@@ -20,8 +20,8 @@ type VPN struct {
 	Wireguard Wireguard
 }
 
-// Validate validates VPN settings.
-func (v VPN) validate(allServers models.AllServers) (err error) {
+// TODO v4 remove pointer for receiver (because of Surfshark).
+func (v *VPN) validate(allServers models.AllServers) (err error) {
 	// Validate Type
 	validVPNTypes := []string{constants.OpenVPN, constants.Wireguard}
 	if !helpers.IsOneOf(v.Type, validVPNTypes...) {