pomme/internal/api/fs.go

package api

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"

	"dns.froth.zone/pomme/internal"
)

var errEmptyFile = errors.New("will not save empty file to FS")

// makeLocal takes a type path and then saves a zone file to either tmp or a permanent location.
func makeLocal(zone *ZoneRequest) error {
	if _, err := os.Stat(fmt.Sprintf(zone.FileName, zone.User)); !os.IsNotExist(err) {
		return fmt.Errorf("file %s already exists: %w", zone.FileName, err)
	}

	if len(zone.Body) == 0 {
		return errEmptyFile
	}

	c, err := internal.ReadConfig()
	if err != nil {
		logger := newResponder(Response[any]{
			Message: "no config file defined",
			Err:     err.Error(),
		})
		logger.writeLogEntry()

		return fmt.Errorf("unable to parse directory: %w", err)
	}

	path := fmt.Sprintf("%s/%s/", c.ZoneDir, zone.FileName)
	if err = os.MkdirAll(path, 0o750); err != nil {
		logger := newResponder(Response[any]{
			Message: "unable to make directory for zone files",
			Err:     err.Error(),
		})
		logger.writeLogEntry()

		return fmt.Errorf("unable to make zone directory: %w", err)
	}

	f, err := os.Create(filepath.Clean(path + zone.FileName)) //nolint: gosec
	if err != nil {
		return fmt.Errorf("failed to write file locally: %w", err)
	}

	// close and remove the temporary file at the end of the program
	defer func() {
		if err = f.Close(); err != nil {
			return
		}
	}()

	err = os.WriteFile(f.Name(), zone.Body, 0o600)

	if err != nil {
		return fmt.Errorf("failed to write file locally: %w", err)
	}

	return nil
}