CIiP-WS-2021-2022-Projektarbeit_Lithium/storage/storage.go

package storage

import (
	"os"
	"path/filepath"

	"github.com/spf13/afero"
)

type IStorageProvider interface {
	StoreRaw(bucketName string, objectName string, data []byte) (string, error)
	StoreExisting(bucketName string, objectName string, existingFilePath string) (string, error)
}

type FileSystemStorageProvider struct {
	fileSystem afero.Fs
	basePath   string
}

func (sp FileSystemStorageProvider) StoreRaw(bucketName string, objectName string, data []byte) (string, error) {
	directoryPath := filepath.Join(sp.basePath, bucketName)

	if err := sp.fileSystem.MkdirAll(directoryPath, os.ModePerm); err != nil {
		return "", err
	}

	filePath := filepath.Join(directoryPath, objectName)

	if err := afero.WriteFile(sp.fileSystem, filePath, data, os.ModePerm); err != nil {
		return "", err
	}

	return filePath, nil
}

func (sp FileSystemStorageProvider) StoreExisting(bucketName string, objectName string, existingFilePath string) (string, error) {
	bytesRead, err := afero.ReadFile(sp.fileSystem, existingFilePath)
	if err != nil {
		return "", err
	}

	return sp.StoreRaw(bucketName, objectName, bytesRead)
}

func GetFileSystemStorageProvider(basePath string, wd string) FileSystemStorageProvider {
	if wd == "" {
		wd, _ = os.Getwd()
	}

	return FileSystemStorageProvider{
		fileSystem: afero.NewBasePathFs(afero.NewOsFs(), filepath.Join(wd, "files")),
		basePath:   basePath,
	}
}

// TODO: Move this out of this file
func GetMemoryStorageProvider() FileSystemStorageProvider {
	return FileSystemStorageProvider{
		fileSystem: afero.NewBasePathFs(afero.NewMemMapFs(), "/"),
		basePath:   "/tmp/foo/bar",
	}
}