feat(providers): add AirVPN support (#1145)

internal/configuration/settings/openvpn.go

@@ -95,7 +95,9 @@ func (o OpenVPN) validate(vpnProvider string) (err error) {
 	}
 
 	isCustom := vpnProvider == providers.Custom
-	isUserRequired := !isCustom && vpnProvider != providers.VPNSecure
+	isUserRequired := !isCustom &&
+		vpnProvider != providers.Airvpn &&
+		vpnProvider != providers.VPNSecure
 
 	if isUserRequired && *o.User == "" {
 		return ErrOpenVPNUserIsEmpty
@@ -179,6 +181,7 @@ func validateOpenVPNClientCertificate(vpnProvider,
 	clientCert string) (err error) {
 	switch vpnProvider {
 	case
+		providers.Airvpn,
 		providers.Cyberghost,
 		providers.VPNSecure,
 		providers.VPNUnlimited:
@@ -201,6 +204,7 @@ func validateOpenVPNClientCertificate(vpnProvider,
 func validateOpenVPNClientKey(vpnProvider, clientKey string) (err error) {
 	switch vpnProvider {
 	case
+		providers.Airvpn,
 		providers.Cyberghost,
 		providers.VPNUnlimited,
 		providers.Wevpn:

internal/configuration/settings/openvpnselection.go

@@ -67,6 +67,12 @@ func (o OpenVPNSelection) validate(vpnProvider string) (err error) {
 		default:
 			var allowedTCP, allowedUDP []uint16
 			switch vpnProvider {
+			case providers.Airvpn:
+				allowedTCP = []uint16{
+					53, 80, 443, // IP in 1, 3
+					1194, 2018, 41185, // IP in 1, 2, 3, 4
+				}
+				allowedUDP = []uint16{53, 80, 443, 1194, 2018, 41185}
 			case providers.Ivpn:
 				allowedTCP = []uint16{80, 443, 1143}
 				allowedUDP = []uint16{53, 1194, 2049, 2050}

internal/configuration/settings/provider.go

@@ -30,6 +30,7 @@ func (p *Provider) validate(vpnType string, storage Storage) (err error) {
 		validNames = append(validNames, "pia") // Retro-compatibility
 	} else { // Wireguard
 		validNames = []string{
+			providers.Airvpn,
 			providers.Custom,
 			providers.Ivpn,
 			providers.Mullvad,

internal/configuration/settings/wireguard.go

@@ -54,6 +54,12 @@ func (w Wireguard) validate(vpnProvider string) (err error) {
 		return fmt.Errorf("private key is not valid: %w", err)
 	}
 
+	if vpnProvider == providers.Airvpn {
+		if *w.PreSharedKey == "" {
+			return fmt.Errorf("%w", ErrWireguardPreSharedKeyNotSet)
+		}
+	}
+
 	// Validate PreSharedKey
 	if *w.PreSharedKey != "" { // Note: this is optional
 		_, err = wgtypes.ParseKey(*w.PreSharedKey)

internal/configuration/settings/wireguardselection.go

@@ -36,7 +36,7 @@ type WireguardSelection struct {
 func (w WireguardSelection) validate(vpnProvider string) (err error) {
 	// Validate EndpointIP
 	switch vpnProvider {
-	case providers.Ivpn, providers.Mullvad,
+	case providers.Airvpn, providers.Ivpn, providers.Mullvad,
 		providers.Surfshark, providers.Windscribe:
 		// endpoint IP addresses are baked in
 	case providers.Custom:
@@ -58,7 +58,7 @@ func (w WireguardSelection) validate(vpnProvider string) (err error) {
 		if *w.EndpointPort != 0 {
 			return ErrWireguardEndpointPortSet
 		}
-	case providers.Ivpn, providers.Mullvad, providers.Windscribe:
+	case providers.Airvpn, providers.Ivpn, providers.Mullvad, providers.Windscribe:
 		// EndpointPort is optional and can be 0
 		if *w.EndpointPort == 0 {
 			break // no custom endpoint port set
@@ -68,6 +68,8 @@ func (w WireguardSelection) validate(vpnProvider string) (err error) {
 		}
 		var allowed []uint16
 		switch vpnProvider {
+		case providers.Airvpn:
+			allowed = []uint16{1637, 47107}
 		case providers.Ivpn:
 			allowed = []uint16{2049, 2050, 53, 30587, 41893, 48574, 58237}
 		case providers.Windscribe: