chore(all): move sub-packages to internal/provider

internal/provider/nordvpn/updater/servers.go

@@ -0,0 +1,68 @@
+// Package nordvpn contains code to obtain the server information
+// for the NordVPN provider.
+package nordvpn
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+
+	"github.com/qdm12/gluetun/internal/constants/vpn"
+	"github.com/qdm12/gluetun/internal/models"
+)
+
+var (
+	ErrParseIP          = errors.New("cannot parse IP address")
+	ErrNotIPv4          = errors.New("IP address is not IPv4")
+	ErrNotEnoughServers = errors.New("not enough servers found")
+)
+
+func GetServers(ctx context.Context, client *http.Client, minServers int) (
+	servers []models.Server, warnings []string, err error) {
+	data, err := fetchAPI(ctx, client)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	servers = make([]models.Server, 0, len(data))
+
+	for _, jsonServer := range data {
+		if !jsonServer.Features.TCP && !jsonServer.Features.UDP {
+			warning := "server does not support TCP and UDP for openvpn: " + jsonServer.Name
+			warnings = append(warnings, warning)
+			continue
+		}
+
+		ip, err := parseIPv4(jsonServer.IPAddress)
+		if err != nil {
+			return nil, nil, fmt.Errorf("%w for server %s", err, jsonServer.Name)
+		}
+
+		number, err := parseServerName(jsonServer.Name)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		server := models.Server{
+			VPN:      vpn.OpenVPN,
+			Region:   jsonServer.Country,
+			Hostname: jsonServer.Domain,
+			Number:   number,
+			IPs:      []net.IP{ip},
+			TCP:      jsonServer.Features.TCP,
+			UDP:      jsonServer.Features.UDP,
+		}
+		servers = append(servers, server)
+	}
+
+	if len(servers) < minServers {
+		return nil, warnings, fmt.Errorf("%w: %d and expected at least %d",
+			ErrNotEnoughServers, len(servers), minServers)
+	}
+
+	sortServers(servers)
+
+	return servers, warnings, nil
+}