Servers updater (#232)

* Support for all VPN providers
* Update all VPN providers servers information
* Remove old tooling binaries

internal/updater/vyprvpn.go

@@ -0,0 +1,72 @@
+package updater
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"sort"
+	"strings"
+
+	"github.com/qdm12/gluetun/internal/models"
+)
+
+func (u *updater) updateVyprvpn(ctx context.Context) (err error) {
+	servers, err := findVyprvpnServers(ctx, u.lookupIP)
+	if err != nil {
+		return fmt.Errorf("cannot update Vyprvpn servers: %w", err)
+	}
+	if u.options.Stdout {
+		u.println(stringifyVyprvpnServers(servers))
+	}
+	u.servers.Vyprvpn.Timestamp = u.timeNow().Unix()
+	u.servers.Vyprvpn.Servers = servers
+	return nil
+}
+
+func findVyprvpnServers(ctx context.Context, lookupIP lookupIPFunc) (servers []models.VyprvpnServer, err error) {
+	const zipURL = "https://support.vyprvpn.com/hc/article_attachments/360052617332/Vypr_OpenVPN_20200320.zip"
+	contents, err := fetchAndExtractFiles(zipURL)
+	if err != nil {
+		return nil, err
+	}
+	for fileName, content := range contents {
+		remoteLines := extractRemoteLinesFromOpenvpn(content)
+		if len(remoteLines) == 0 {
+			return nil, fmt.Errorf("cannot find any remote lines in %s", fileName)
+		}
+		hosts := extractHostnamesFromRemoteLines(remoteLines)
+		if len(hosts) == 0 {
+			return nil, fmt.Errorf("cannot find any hosts in %s", fileName)
+		}
+		var IPs []net.IP
+		for _, host := range hosts {
+			newIPs, err := lookupIP(ctx, host)
+			if err != nil {
+				return nil, err
+			}
+			IPs = append(IPs, newIPs...)
+		}
+		region := strings.TrimSuffix(fileName, ".ovpn")
+		region = strings.ReplaceAll(region, " - ", " ")
+		server := models.VyprvpnServer{
+			Region: region,
+			IPs:    uniqueSortedIPs(IPs),
+		}
+		servers = append(servers, server)
+	}
+	sort.Slice(servers, func(i, j int) bool {
+		return servers[i].Region < servers[j].Region
+	})
+	return servers, nil
+}
+
+func stringifyVyprvpnServers(servers []models.VyprvpnServer) (s string) {
+	s = "func VyprvpnServers() []models.VyprvpnServer {\n"
+	s += "	return []models.VyprvpnServer{\n"
+	for _, server := range servers {
+		s += "		" + server.String() + ",\n"
+	}
+	s += "	}\n"
+	s += "}"
+	return s
+}