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package storage
import (
"fmt"
"github.com/pkg/errors"
"github.com/viant/toolbox"
"io"
"io/ioutil"
"net/url"
"os"
"path"
"strings"
)
var fileMode os.FileMode = 0644
var execFileMode os.FileMode = 0755
//Service represents abstract way to accessing local or remote storage
type fileStorageService struct{}
//List returns a list of object for supplied url
func (s *fileStorageService) List(URL string) ([]Object, error) {
file, err := toolbox.OpenFile(URL)
if err != nil {
return nil, err
}
defer file.Close()
stat, err := file.Stat()
if err == nil {
if !stat.IsDir() {
return []Object{
newFileObject(URL, stat),
}, nil
}
}
files, err := file.Readdir(0)
if err != nil {
return nil, err
}
var result = make([]Object, 0)
result = append(result, newFileObject(URL, stat))
var parsedURL, _ = url.Parse(URL)
for _, fileInfo := range files {
var fileName = fileInfo.Name()
if parsedURL != nil {
fileName = strings.Replace(fileName, parsedURL.Path, "", 1)
}
fileURL := toolbox.URLPathJoin(URL, fileName)
result = append(result, newFileObject(fileURL, fileInfo))
}
return result, nil
}
//Exists returns true if resource exists
func (s *fileStorageService) Exists(URL string) (bool, error) {
parsedUrl, err := url.Parse(URL)
if err != nil {
return false, err
}
if parsedUrl.Scheme != "file" {
return false, fmt.Errorf("invalid schema, expected file but had: %v", parsedUrl.Scheme)
}
return toolbox.FileExists(parsedUrl.Path), nil
}
func (s *fileStorageService) Close() error {
return nil
}
//Object returns a Object for supplied url
func (s *fileStorageService) StorageObject(URL string) (Object, error) {
file, err := toolbox.OpenFile(URL)
if err != nil {
return nil, err
}
defer file.Close()
fileInfo, err := os.Stat(file.Name())
if err != nil {
return nil, err
}
return newFileObject(URL, fileInfo), nil
}
//Download returns reader for downloaded storage object
func (s *fileStorageService) Download(object Object) (io.ReadCloser, error) {
return toolbox.OpenFile(object.URL())
}
//DownloadWithURL downloads content for passed in object URL
func (s *fileStorageService) DownloadWithURL(URL string) (io.ReadCloser, error) {
object, err := s.StorageObject(URL)
if err != nil {
return nil, err
}
return s.Download(object)
}
func (s *fileStorageService) Upload(URL string, reader io.Reader) error {
return s.UploadWithMode(URL, DefaultFileMode, reader)
}
//Upload uploads provided reader content for supplied url.
func (s *fileStorageService) UploadWithMode(URL string, mode os.FileMode, reader io.Reader) error {
if mode == 0 {
mode = DefaultFileMode
}
parsedUrl, err := url.Parse(URL)
if err != nil {
return err
}
if parsedUrl.Scheme != "file" {
return fmt.Errorf("Invalid schema, expected file but had: %v", parsedUrl.Scheme)
}
parentDir, _ := path.Split(parsedUrl.Path)
err = toolbox.CreateDirIfNotExist(parentDir)
if err != nil {
return err
}
data, err := ioutil.ReadAll(reader)
if err != nil {
return err
}
return ioutil.WriteFile(parsedUrl.Path, data, mode)
}
func (s *fileStorageService) Register(schema string, service Service) error {
return errors.New("unsupported")
}
//Delete removes passed in storage object
func (s *fileStorageService) Delete(object Object) error {
if object.IsFolder() {
objects, err := s.List(object.URL())
if err != nil {
return err
}
for _, listedObject := range objects {
if listedObject.URL() == object.URL() {
continue
}
if err := s.Delete(listedObject); err != nil {
return err
}
}
}
fileName := toolbox.Filename(object.URL())
return os.Remove(fileName)
}
type fileStorageObject struct {
*AbstractObject
}
func NewFileStorage() Service {
return &fileStorageService{}
}
func (o *fileStorageObject) Unwrap(target interface{}) error {
if fileInfo, casted := target.(*os.FileInfo); casted {
source, ok := o.Source.(os.FileInfo)
if !ok {
return fmt.Errorf("failed to cast %T into %T", o.Source, target)
}
*fileInfo = source
return nil
}
return fmt.Errorf("unsuported target %T", target)
}
func (o *fileStorageObject) FileInfo() os.FileInfo {
if source, ok := o.Source.(os.FileInfo); ok {
return source
}
return nil
}
func newFileObject(url string, fileInfo os.FileInfo) Object {
abstract := NewAbstractStorageObject(url, fileInfo, fileInfo)
result := &fileStorageObject{
AbstractObject: abstract,
}
result.AbstractObject.Object = result
return result
}
const FileProviderSchema = "file"
func init() {
Registry().Registry[FileProviderSchema] = fileServiceProvider
}
func fileServiceProvider(credentialFile string) (service Service, err error) {
return NewFileStorage(), nil
}
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