Maint: internal/openvpn setup.go file

internal/openvpn/setup.go

@@ -0,0 +1,59 @@
+package openvpn
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/qdm12/gluetun/internal/configuration"
+	"github.com/qdm12/gluetun/internal/firewall"
+	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/openvpn/config"
+	"github.com/qdm12/gluetun/internal/openvpn/custom"
+	"github.com/qdm12/gluetun/internal/provider"
+)
+
+var (
+	errBuildConfig = errors.New("failed building configuration")
+	errWriteConfig = errors.New("failed writing configuration to file")
+	errWriteAuth   = errors.New("failed writing auth to file")
+	errFirewall    = errors.New("failed allowing VPN connection through firewall")
+)
+
+// setup sets OpenVPN up using the configurators and settings given.
+// It returns a serverName for port forwarding (PIA) and an error if it fails.
+func setup(ctx context.Context, fw firewall.VPNConnectionSetter,
+	openvpnConf config.Interface, providerConf provider.Provider,
+	openVPNSettings configuration.OpenVPN, providerSettings configuration.Provider) (
+	serverName string, err error) {
+	var connection models.OpenVPNConnection
+	var lines []string
+	if openVPNSettings.Config == "" {
+		connection, err = providerConf.GetOpenVPNConnection(providerSettings.ServerSelection)
+		if err == nil {
+			lines = providerConf.BuildConf(connection, openVPNSettings)
+		}
+	} else {
+		lines, connection, err = custom.BuildConfig(openVPNSettings)
+	}
+	if err != nil {
+		return "", fmt.Errorf("%w: %s", errBuildConfig, err)
+	}
+
+	if err := openvpnConf.WriteConfig(lines); err != nil {
+		return "", fmt.Errorf("%w: %s", errWriteConfig, err)
+	}
+
+	if openVPNSettings.User != "" {
+		err := openvpnConf.WriteAuthFile(openVPNSettings.User, openVPNSettings.Password)
+		if err != nil {
+			return "", fmt.Errorf("%w: %s", errWriteAuth, err)
+		}
+	}
+
+	if err := fw.SetVPNConnection(ctx, connection); err != nil {
+		return "", fmt.Errorf("%w: %s", errFirewall, err)
+	}
+
+	return connection.Hostname, nil
+}