feat(pia): PORT_FORWARD_ONLY variable (#2070)

internal/provider/utils/filtering.go

@@ -53,6 +53,10 @@ func filterServer(server models.Server,
 		return true
 	}
 
+	if *selection.PortForwardOnly && !server.PortForward {
+		return true
+	}
+
 	if filterByPossibilities(server.Country, selection.Countries) {
 		return true
 	}

internal/provider/utils/filtering_test.go

@@ -127,6 +127,19 @@ func Test_FilterServers(t *testing.T) {
 				{Owned: true, VPN: vpn.OpenVPN, UDP: true},
 			},
 		},
+		"filter by port forwarding only": {
+			selection: settings.ServerSelection{
+				PortForwardOnly: boolPtr(true),
+			}.WithDefaults(providers.PrivateInternetAccess),
+			servers: []models.Server{
+				{PortForward: false, VPN: vpn.OpenVPN, UDP: true},
+				{PortForward: true, VPN: vpn.OpenVPN, UDP: true},
+				{PortForward: false, VPN: vpn.OpenVPN, UDP: true},
+			},
+			filtered: []models.Server{
+				{PortForward: true, VPN: vpn.OpenVPN, UDP: true},
+			},
+		},
 		"filter by country": {
 			selection: settings.ServerSelection{
 				Countries: []string{"b"},