Feat: WeVPN support (#591)

internal/updater/providers/wevpn/servers.go

@@ -0,0 +1,58 @@
+// package wevpn contains code to obtain the server information
+// for the WeVPN provider.
+package wevpn
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/updater/resolver"
+)
+
+var (
+	ErrGetZip           = errors.New("cannot get OpenVPN ZIP file")
+	ErrGetAPI           = errors.New("cannot fetch server information from API")
+	ErrNotEnoughServers = errors.New("not enough servers found")
+)
+
+func GetServers(ctx context.Context, presolver resolver.Parallel, minServers int) (
+	servers []models.WevpnServer, warnings []string, err error) {
+	cities := getAvailableCities()
+	servers = make([]models.WevpnServer, 0, len(cities))
+	hostnames := make([]string, len(cities))
+	hostnameToCity := make(map[string]string, len(cities))
+
+	for i, city := range cities {
+		hostname := getHostnameFromCity(city)
+		hostnames[i] = hostname
+		hostnameToCity[hostname] = city
+	}
+
+	hostnameToIPs, newWarnings, err := resolveHosts(ctx, presolver, hostnames, minServers)
+	warnings = append(warnings, newWarnings...)
+	if err != nil {
+		return nil, warnings, err
+	}
+
+	if len(hostnameToIPs) < minServers {
+		return nil, warnings, fmt.Errorf("%w: %d and expected at least %d",
+			ErrNotEnoughServers, len(servers), minServers)
+	}
+
+	for hostname, ips := range hostnameToIPs {
+		city := hostnameToCity[hostname]
+		server := models.WevpnServer{
+			City:     city,
+			Hostname: hostname,
+			UDP:      true,
+			IPs:      ips,
+		}
+		servers = append(servers, server)
+	}
+
+	sortServers(servers)
+
+	return servers, warnings, nil
+}