Feature: filter by name and hostname for NordVPN

Dockerfile

@@ -97,7 +97,7 @@ ENV VPNSP=pia \
     OPENVPN_CLIENTKEY_SECRETFILE=/run/secrets/openvpn_clientkey \
     # Nordvpn only:
     SERVER_NUMBER= \
-    # ProtonVPN only:
+    # NordVPN and ProtonVPN only:
     SERVER_NAME= \
     # Openvpn
     OPENVPN_CIPHER= \

internal/configuration/nordvpn.go

@@ -13,6 +13,14 @@ func (settings *Provider) nordvpnLines() (lines []string) {
 		lines = append(lines, lastIndent+"Regions: "+commaJoin(settings.ServerSelection.Regions))
 	}
 
+	if len(settings.ServerSelection.Hostnames) > 0 {
+		lines = append(lines, lastIndent+"Hostnames: "+commaJoin(settings.ServerSelection.Hostnames))
+	}
+
+	if len(settings.ServerSelection.Names) > 0 {
+		lines = append(lines, lastIndent+"Names: "+commaJoin(settings.ServerSelection.Hostnames))
+	}
+
 	if numbersUint16 := settings.ServerSelection.Numbers; len(numbersUint16) > 0 {
 		numbersString := make([]string, len(numbersUint16))
 		for i, numberUint16 := range numbersUint16 {
@@ -42,6 +50,16 @@ func (settings *Provider) readNordvpn(r reader) (err error) {
 		return err
 	}
 
+	settings.ServerSelection.Hostnames, err = r.env.CSVInside("SERVER_HOSTNAME", constants.NordvpnHostnameChoices())
+	if err != nil {
+		return err
+	}
+
+	settings.ServerSelection.Names, err = r.env.CSVInside("SERVER_NAME", constants.NordvpnHostnameChoices())
+	if err != nil {
+		return err
+	}
+
 	settings.ServerSelection.Numbers, err = readNordVPNServerNumbers(r.env)
 	if err != nil {
 		return err

internal/constants/servers.go

@@ -27,8 +27,8 @@ func GetAllServers() (allServers models.AllServers) {
 			Servers:   MullvadServers(),
 		},
 		Nordvpn: models.NordvpnServers{
-			Version:   1,
-			Timestamp: 1620435633,
+			Version:   2,
+			Timestamp: 1620514180,
 			Servers:   NordvpnServers(),
 		},
 		Privado: models.PrivadoServers{

internal/constants/servers_test.go

@@ -57,7 +57,7 @@ func Test_versions(t *testing.T) {
 		"Nordvpn": {
 			model:   models.NordvpnServer{},
 			version: allServers.Nordvpn.Version,
-			digest:  "040de8d0",
+			digest:  "a3b5d609",
 		},
 		"Privado": {
 			model:   models.PrivadoServer{},
@@ -163,7 +163,7 @@ func Test_timestamps(t *testing.T) {
 		"Nordvpn": {
 			servers:   allServers.Nordvpn.Servers,
 			timestamp: allServers.Nordvpn.Timestamp,
-			digest:    "69cb84b3",
+			digest:    "b2619eea",
 		},
 		"Privado": {
 			servers:   allServers.Privado.Servers,

internal/models/server.go

@@ -64,6 +64,8 @@ func (s *MullvadServer) String() string {
 
 type NordvpnServer struct { //nolint:maligned
 	Region   string `json:"region"`
+	Hostname string `json:"hostname"`
+	Name     string `json:"name"`
 	Number   uint16 `json:"number"`
 	IP       net.IP `json:"ip"`
 	TCP      bool   `json:"tcp"`
@@ -71,8 +73,8 @@ type NordvpnServer struct { //nolint:maligned
 }
 
 func (s *NordvpnServer) String() string {
-	return fmt.Sprintf("{Region: %q, Number: %d, TCP: %t, UDP: %t, IP: %s}",
-		s.Region, s.Number, s.TCP, s.UDP, goStringifyIP(s.IP))
+	return fmt.Sprintf("{Region: %q, Hostname: %q, Name: %q, Number: %d, TCP: %t, UDP: %t, IP: %s}",
+		s.Region, s.Hostname, s.Name, s.Number, s.TCP, s.UDP, goStringifyIP(s.IP))
 }
 
 type PrivadoServer struct {

internal/provider/nordvpn.go

@@ -2,6 +2,7 @@ package provider
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"math/rand"
 	"net"
@@ -28,7 +29,7 @@ func newNordvpn(servers []models.NordvpnServer, timeNow timeNowFunc) *nordvpn {
 	}
 }
 
-func (n *nordvpn) filterServers(regions []string, protocol string, numbers []uint16) (
+func (n *nordvpn) filterServers(regions, hostnames, names []string, numbers []uint16, protocol string) (
 	servers []models.NordvpnServer) {
 	numbersStr := make([]string, len(numbers))
 	for i := range numbers {
@@ -41,6 +42,8 @@ func (n *nordvpn) filterServers(regions []string, protocol string, numbers []uin
 			protocol == constants.TCP && !server.TCP,
 			protocol == constants.UDP && !server.UDP,
 			filterByPossibilities(server.Region, regions),
+			filterByPossibilities(server.Hostname, hostnames),
+			filterByPossibilities(server.Name, names),
 			filterByPossibilities(numberStr, numbersStr):
 		default:
 			servers = append(servers, server)
@@ -49,6 +52,34 @@ func (n *nordvpn) filterServers(regions []string, protocol string, numbers []uin
 	return servers
 }
 
+var errNoServerFound = errors.New("no server found")
+
+func (n *nordvpn) notFoundErr(selection configuration.ServerSelection) error {
+	message := "for protocol " + selection.Protocol
+
+	if len(selection.Regions) > 0 {
+		message += " + regions " + commaJoin(selection.Regions)
+	}
+
+	if len(selection.Hostnames) > 0 {
+		message += " + hostnames " + commaJoin(selection.Hostnames)
+	}
+
+	if len(selection.Names) > 0 {
+		message += " + names " + commaJoin(selection.Names)
+	}
+
+	if len(selection.Numbers) > 0 {
+		numbers := make([]string, len(selection.Numbers))
+		for i, n := range selection.Numbers {
+			numbers[i] = strconv.Itoa(int(n))
+		}
+		message += " + numbers " + commaJoin(numbers)
+	}
+
+	return fmt.Errorf("%w: %s", errNoServerFound, message)
+}
+
 func (n *nordvpn) GetOpenVPNConnection(selection configuration.ServerSelection) (
 	connection models.OpenVPNConnection, err error) {
 	var port uint16
@@ -65,10 +96,10 @@ func (n *nordvpn) GetOpenVPNConnection(selection configuration.ServerSelection)
 		return models.OpenVPNConnection{IP: selection.TargetIP, Port: port, Protocol: selection.Protocol}, nil
 	}
 
-	servers := n.filterServers(selection.Regions, selection.Protocol, selection.Numbers)
+	servers := n.filterServers(selection.Regions, selection.Hostnames,
+		selection.Names, selection.Numbers, selection.Protocol)
 	if len(servers) == 0 {
-		return connection, fmt.Errorf("no server found for region %s, protocol %s and numbers %v",
-			commaJoin(selection.Regions), selection.Protocol, selection.Numbers)
+		return connection, n.notFoundErr(selection)
 	}
 
 	connections := make([]models.OpenVPNConnection, len(servers))

internal/updater/providers/nordvpn/servers.go

@@ -45,6 +45,8 @@ func GetServers(ctx context.Context, client *http.Client, minServers int) (
 
 		server := models.NordvpnServer{
 			Region:   jsonServer.Country,
+			Hostname: jsonServer.Domain,
+			Name:     jsonServer.Name,
 			Number:   number,
 			IP:       ip,
 			TCP:      jsonServer.Features.TCP,