fsys/file.go

package fsys

import (
	"bytes"
	"github.com/minio/minio-go/v7"
	"io"
	"mime"
	"os"
	"path/filepath"
)

type File struct {
	storage *Storage
	file    io.ReadSeekCloser

	Name string
}

func (f *File) Read(p []byte) (n int, err error) {
	return f.file.Read(p)
}

func (f *File) Seek(offset int64, whence int) (int64, error) {
	return f.file.Seek(offset, whence)
}

func (f *File) Write(p []byte) (n int, err error) {
	if osFile, ok := f.file.(*os.File); ok {
		return osFile.Write(p)
	} else {
		var fileContent []byte
		if _, err := f.Read(fileContent); err != nil && err != io.EOF {
			return 0, err
		}

		fileContent = append(fileContent, p...)

		mimeType := mime.TypeByExtension(filepath.Ext(f.Name))
		if mimeType == "" {
			mimeType = "application/octet-stream"
		}

		_, err = f.storage.s3Client.PutObject(f.storage.ctx, f.storage.config.S3BucketName, f.Name, bytes.NewBuffer(fileContent), int64(len(fileContent)), minio.PutObjectOptions{
			ContentType: mimeType,
		})
		if err != nil {
			return 0, err
		}
		return len(p), nil
	}
}

func (f *File) Close() error {
	return f.file.Close()
}