New PIA servers support (#227)

* Adapt storage: SyncServers write to file option, export FlushToFile
* CLI built-in updater for old and new PIA servers
* Update hardcoded IP addresses for PIA old and new servers
* Add PIA old to allServers struct and update timestamps
* Adapt code to work with new and old PIA servers
* Remove PIA subdomains (unneeded) from resolver tool

internal/models/selection.go

@@ -75,12 +75,17 @@ func (p *ProviderSettings) String() string {
 		number = fmt.Sprintf("%d", p.ServerSelection.Number)
 	}
 	switch strings.ToLower(string(p.Name)) {
-	case "private internet access":
+	case "private internet access old":
 		settingsList = append(settingsList,
 			"Region: "+p.ServerSelection.Region,
 			"Encryption preset: "+p.ExtraConfigOptions.EncryptionPreset,
 			"Port forwarding: "+p.PortForwarding.String(),
 		)
+	case "private internet access":
+		settingsList = append(settingsList,
+			"Region: "+p.ServerSelection.Region,
+			"Encryption preset: "+p.ExtraConfigOptions.EncryptionPreset,
+		)
 	case "mullvad":
 		settingsList = append(settingsList,
 			"Country: "+p.ServerSelection.Country,

internal/models/server.go

@@ -1,12 +1,28 @@
 package models
 
-import "net"
+import (
+	"fmt"
+	"net"
+	"strings"
+)
+
+func stringifyIPs(ips []net.IP) string {
+	ipStrings := make([]string, len(ips))
+	for i := range ips {
+		ipStrings[i] = fmt.Sprintf("{%s}", strings.ReplaceAll(ips[i].String(), ".", ", "))
+	}
+	return strings.Join(ipStrings, ", ")
+}
 
 type PIAServer struct {
 	IPs    []net.IP `json:"ips"`
 	Region string   `json:"region"`
 }
 
+func (p *PIAServer) String() string {
+	return fmt.Sprintf("{Region: %q, IPs: []net.IP{%s}}", p.Region, stringifyIPs(p.IPs))
+}
+
 type MullvadServer struct {
 	IPs     []net.IP `json:"ips"`
 	Country string   `json:"country"`

internal/models/servers.go

@@ -5,6 +5,7 @@ type AllServers struct {
 	Cyberghost CyberghostServers `json:"cyberghost"`
 	Mullvad    MullvadServers    `json:"mullvad"`
 	Nordvpn    NordvpnServers    `json:"nordvpn"`
+	PiaOld     PiaServers        `json:"piaOld"`
 	Pia        PiaServers        `json:"pia"`
 	Purevpn    PurevpnServers    `json:"purevpn"`
 	Surfshark  SurfsharkServers  `json:"surfshark"`