Fix & feat: Cyberghost server groups

- Allow multiple comma separated values for CYBERGHOST_GROUP
- Defaults to all UDP groups
- If TCP is enabled, defaults to all TCP groups
- Check groups specified match the protocol
- Default Cyberghost group to empty
- Adjust formatting and messages

internal/configuration/cyberghost.go

@@ -4,11 +4,10 @@ import (
 	"fmt"
 
 	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/golibs/params"
 )
 
 func (settings *Provider) cyberghostLines() (lines []string) {
-	lines = append(lines, lastIndent+"Server group: "+settings.ServerSelection.Group)
+	lines = append(lines, lastIndent+"Server groups: "+commaJoin(settings.ServerSelection.Groups))
 
 	if len(settings.ServerSelection.Regions) > 0 {
 		lines = append(lines, lastIndent+"Regions: "+commaJoin(settings.ServerSelection.Regions))
@@ -52,8 +51,8 @@ func (settings *Provider) readCyberghost(r reader) (err error) {
 		return err
 	}
 
-	settings.ServerSelection.Group, err = r.env.Inside("CYBERGHOST_GROUP",
-		constants.CyberghostGroupChoices(), params.Default("Premium UDP Europe"))
+	settings.ServerSelection.Groups, err = r.env.CSVInside("CYBERGHOST_GROUP",
+		constants.CyberghostGroupChoices())
 	if err != nil {
 		return fmt.Errorf("environment variable CYBERGHOST_GROUP: %w", err)
 	}

internal/configuration/openvpn_test.go

@@ -33,7 +33,7 @@ func Test_OpenVPN_JSON(t *testing.T) {
     "server_selection": {
       "tcp": false,
       "regions": null,
-      "group": "",
+      "groups": null,
       "countries": null,
       "cities": null,
       "hostnames": null,

internal/configuration/provider_test.go

@@ -24,7 +24,7 @@ func Test_Provider_lines(t *testing.T) {
 			settings: Provider{
 				Name: constants.Cyberghost,
 				ServerSelection: ServerSelection{
-					Group:   "group",
+					Groups:  []string{"group"},
 					Regions: []string{"a", "El country"},
 				},
 				ExtraConfigOptions: ExtraConfigOptions{
@@ -35,7 +35,7 @@ func Test_Provider_lines(t *testing.T) {
 			lines: []string{
 				"|--Cyberghost settings:",
 				"   |--Network protocol: udp",
-				"   |--Server group: group",
+				"   |--Server groups: group",
 				"   |--Regions: a, El country",
 				"   |--Client key is set",
 				"   |--Client certificate is set",

internal/configuration/selection.go

@@ -13,7 +13,7 @@ type ServerSelection struct { //nolint:maligned
 	Regions []string `json:"regions"`
 
 	// Cyberghost
-	Group string `json:"group"`
+	Groups []string `json:"groups"`
 
 	// Fastestvpn, HideMyAss, IPVanish, IVPN, Mullvad, PrivateVPN, Protonvpn, PureVPN, VPNUnlimited
 	Countries []string `json:"countries"`