add stat func

storage.go

@@ -12,6 +12,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"time"
 )
 
 var (
@@ -120,7 +121,7 @@ func (s *Storage) Open(name string) (*File, error) {
 		returnFile.Name = objectStat.Key
 		returnFile.file = object
 	} else {
-		if _, err := os.Stat(filepath.Join(s.config.Path, name)); err != nil && os.IsNotExist(err) {
+		if _, err := os.Stat(filepath.Join(s.config.Path, name)); err != nil && errors.Is(err, fs.ErrNotExist) {
 			return nil, ErrFileNotFound
 		} else if err != nil {
 			return nil, err
@@ -198,3 +199,49 @@ func (s *Storage) Delete(name string) error {
 		return os.Remove(filepath.Join(s.config.Path, name))
 	}
 }
+
+type FileInfo struct {
+	Name    string
+	Size    int64
+	ModTime time.Time
+	IsDir   bool
+	Mode    os.FileMode
+}
+
+// Stat grabs the file info from the Storage interface.
+// It takes a file name as its parameter.
+// The function returns FileInfo, and an error, if any.
+func (s *Storage) Stat(name string) (*FileInfo, error) {
+	fileInfo := new(FileInfo)
+
+	if s.s3Client != nil {
+		objInfo, err := s.s3Client.StatObject(s.ctx, s.config.S3BucketName, name, minio.StatObjectOptions{})
+		if err != nil {
+			errResp := minio.ToErrorResponse(err)
+			if errResp.StatusCode == http.StatusNotFound {
+				return nil, ErrFileNotFound
+			} else {
+				return nil, err
+			}
+		}
+
+		fileInfo.Name = objInfo.Key
+		fileInfo.Size = objInfo.Size
+		fileInfo.ModTime = objInfo.LastModified
+		fileInfo.Mode = 0777 // Used as a fake perm. Doesn't actually do anything.
+	} else {
+		fInfo, err := os.Stat(filepath.Join(s.config.Path, name))
+		if err != nil {
+			if errors.Is(err, fs.ErrNotExist) {
+				return nil, ErrFileNotFound
+			}
+			return nil, err
+		}
+		fileInfo.Name = fInfo.Name()
+		fileInfo.Size = fInfo.Size()
+		fileInfo.ModTime = fInfo.ModTime()
+		fileInfo.Mode = fInfo.Mode()
+	}
+
+	return fileInfo, nil
+}

storage_test.go

@@ -3,6 +3,7 @@ package fsys
 import (
 	"github.com/stretchr/testify/assert"
 	"io"
+	"io/fs"
 	"testing"
 )
 
@@ -18,6 +19,13 @@ func TestStorageLocal(t *testing.T) {
 	err = stor.Write("test.txt", []byte("hi"), WriteOptions{})
 	assert.NoError(t, err)
 
+	t.Log("== Stat ==")
+	fileInfo, err := stor.Stat("test.txt")
+	assert.NoError(t, err)
+	assert.Equal(t, "test.txt", fileInfo.Name)
+	assert.Equal(t, int64(len("hi")), fileInfo.Size)
+	assert.Equal(t, fs.FileMode(0600), fileInfo.Mode)
+
 	t.Log("== Read ==")
 	fileContent, err := stor.Read("test.txt")
 	assert.NoError(t, err)
@@ -56,6 +64,13 @@ func TestStorageS3(t *testing.T) {
 	err = stor.Write("test.txt", []byte("hi"), WriteOptions{})
 	assert.NoError(t, err)
 
+	t.Log("== Stat ==")
+	fileInfo, err := stor.Stat("test.txt")
+	assert.NoError(t, err)
+	assert.Equal(t, "test.txt", fileInfo.Name)
+	assert.Equal(t, int64(len("hi")), fileInfo.Size)
+	assert.Equal(t, fs.FileMode(0777), fileInfo.Mode)
+
 	t.Log("== Read ==")
 	fileContent, err := stor.Read("test.txt")
 	assert.NoError(t, err)