438 lines
12 KiB
Go
438 lines
12 KiB
Go
package fsys
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import (
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"bytes"
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"context"
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"errors"
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"github.com/minio/minio-go/v7"
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"github.com/minio/minio-go/v7/pkg/credentials"
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"io"
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"io/fs"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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"time"
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)
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var (
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ErrInvalidStorageType = errors.New("invalid storage type")
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ErrInvalidPath = errors.New("invalid path")
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ErrFileNotFound = errors.New("file not found")
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ErrFolderNotFound = errors.New("folder not found")
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)
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type Storage struct {
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config Config
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s3Client *minio.Client
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ctx context.Context
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}
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type Config struct {
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// Type of storage, can be "local" or "s3"
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Type string
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Path string
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S3Endpoint string
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S3Location string
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S3Secure bool
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S3AccessID string
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S3AccessKey string
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S3BucketName string
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}
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// New creates a new storage interface
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// It takes Config as its parameter.
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// The function returns the Storage interface, and an error, if any.
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func New(config Config) (*Storage, error) {
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newStorage := new(Storage)
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newStorage.config = config
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newStorage.ctx = context.Background()
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switch config.Type {
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case "minio", "s3":
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s3Client, err := minio.New(config.S3Endpoint, &minio.Options{
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Creds: credentials.NewStaticV4(config.S3AccessID, config.S3AccessKey, ""),
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Secure: config.S3Secure,
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})
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if err != nil {
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return nil, err
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}
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bucketExists, err := s3Client.BucketExists(newStorage.ctx, config.S3BucketName)
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if err != nil {
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return nil, err
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}
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if !bucketExists {
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if err := s3Client.MakeBucket(newStorage.ctx, config.S3BucketName, minio.MakeBucketOptions{}); err != nil {
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return nil, err
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}
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}
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newStorage.s3Client = s3Client
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case "local":
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if statInfo, err := os.Stat(config.Path); err != nil && errors.Is(err, fs.ErrNotExist) {
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if err := os.MkdirAll(config.Path, 0740); err != nil {
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return nil, err
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}
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} else if err != nil {
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return nil, err
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} else if !statInfo.IsDir() {
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return nil, ErrInvalidPath
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}
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default:
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return nil, ErrInvalidStorageType
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}
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return newStorage, nil
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}
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// Open opens a file within the Storage interface.
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// It takes a file name as its parameter.
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// The function returns a File and an error, if any.
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func (s *Storage) Open(name string) (*File, error) {
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returnFile := new(File)
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returnFile.storage = s
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if s.s3Client != nil {
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object, err := s.s3Client.GetObject(s.ctx, s.config.S3BucketName, name, minio.GetObjectOptions{})
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if err != nil {
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errResp := minio.ToErrorResponse(err)
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if errResp.StatusCode == http.StatusNotFound {
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return nil, ErrFileNotFound
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} else {
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return nil, err
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}
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}
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objectStat, err := object.Stat()
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if err != nil {
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errResp := minio.ToErrorResponse(err)
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if errResp.StatusCode == http.StatusNotFound {
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return nil, ErrFileNotFound
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} else {
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return nil, err
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}
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}
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returnFile.Name = objectStat.Key
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returnFile.file = object
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} else {
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if _, err := os.Stat(filepath.Join(s.config.Path, name)); err != nil && errors.Is(err, fs.ErrNotExist) {
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return nil, ErrFileNotFound
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} else if err != nil {
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return nil, err
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}
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file, err := os.Open(filepath.Join(s.config.Path, name))
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if err != nil {
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return nil, err
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}
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returnFile.file = file
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cutStr, _ := strings.CutPrefix(file.Name(), filepath.Clean(s.config.Path)+"/")
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returnFile.Name = cutStr
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}
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return returnFile, nil
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}
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// Read opens a file within the Storage interfaces and reads the contents.
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// It takes a file name as its parameter.
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// The function returns a []byte, or an error, if any.
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func (s *Storage) Read(name string) ([]byte, error) {
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if s.s3Client != nil {
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_, err := s.s3Client.StatObject(s.ctx, s.config.S3BucketName, name, minio.StatObjectOptions{})
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if err != nil {
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errResp := minio.ToErrorResponse(err)
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if errResp.Code == "NoSuchKey" {
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return nil, ErrFileNotFound
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} else {
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return nil, err
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}
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}
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object, err := s.s3Client.GetObject(s.ctx, s.config.S3BucketName, name, minio.GetObjectOptions{})
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if err != nil {
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return nil, err
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}
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objectBytes, err := io.ReadAll(object)
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if err != nil {
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return nil, err
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}
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return objectBytes, nil
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} else {
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return os.ReadFile(filepath.Join(s.config.Path, name))
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}
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}
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type WriteOptions struct {
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S3Tags map[string]string
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}
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// Write writes to a file within the Storage interface.
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// It takes a name, a []byte, and WriteOptions as its parameters.
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// The function returns an error, if any.
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func (s *Storage) Write(name string, data []byte, opts WriteOptions) error {
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if s.s3Client != nil {
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if _, err := s.s3Client.PutObject(s.ctx, s.config.S3BucketName, name, bytes.NewReader(data), int64(len(data)), minio.PutObjectOptions{
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UserTags: opts.S3Tags,
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}); err != nil {
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return err
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}
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return nil
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} else {
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if fileInfo, err := os.Stat(filepath.Join(s.config.Path, filepath.Dir(name))); err != nil && errors.Is(err, fs.ErrNotExist) {
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if err := os.MkdirAll(filepath.Join(s.config.Path, filepath.Dir(name)), 0740); err != nil {
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return err
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}
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} else if err != nil {
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return err
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} else {
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if !fileInfo.IsDir() {
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return ErrInvalidPath
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}
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}
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return os.WriteFile(filepath.Join(s.config.Path, name), data, 0600)
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}
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}
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// Delete deleted a file within the storage interface.
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// It takes a file name as its parameter.
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// The function returns an error, if any.
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func (s *Storage) Delete(name string) error {
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if s.s3Client != nil {
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if err := s.s3Client.RemoveObject(s.ctx, s.config.S3BucketName, name, minio.RemoveObjectOptions{}); err != nil {
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return err
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}
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return nil
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} else {
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return os.Remove(filepath.Join(s.config.Path, name))
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}
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}
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type FileInfo struct {
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Name string
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Size int64
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ModTime time.Time
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IsDir bool
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// The file permissions, will always be 0777 when using S3.
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Mode os.FileMode
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}
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// Stat grabs the file info from the Storage interface.
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// It takes a file name as its parameter.
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// The function returns FileInfo, and an error, if any.
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func (s *Storage) Stat(name string) (*FileInfo, error) {
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fileInfo := new(FileInfo)
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if s.s3Client != nil {
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objInfo, err := s.s3Client.StatObject(s.ctx, s.config.S3BucketName, name, minio.StatObjectOptions{})
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if err != nil {
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errResp := minio.ToErrorResponse(err)
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if errResp.StatusCode == http.StatusNotFound {
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return nil, ErrFileNotFound
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} else {
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return nil, err
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}
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}
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fileInfo.Name = objInfo.Key
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fileInfo.Size = objInfo.Size
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fileInfo.ModTime = objInfo.LastModified
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fileInfo.Mode = fs.FileMode(0777) // Used as a fake perm. Doesn't actually do anything.
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} else {
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fInfo, err := os.Stat(filepath.Join(s.config.Path, name))
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if err != nil {
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if errors.Is(err, fs.ErrNotExist) {
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return nil, ErrFileNotFound
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}
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return nil, err
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}
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fileInfo.Name = fInfo.Name()
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fileInfo.Size = fInfo.Size()
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fileInfo.ModTime = fInfo.ModTime()
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fileInfo.Mode = fInfo.Mode()
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fileInfo.IsDir = fInfo.IsDir()
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}
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return fileInfo, nil
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}
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// Copy copies a file from one place to another.
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// It takes the file name, and the destination name as its parameter.
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// The function returns an error, if any.
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func (s *Storage) Copy(name string, dest string) error {
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if s.s3Client != nil {
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if _, err := s.s3Client.CopyObject(s.ctx, minio.CopyDestOptions{
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Bucket: s.config.S3BucketName,
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Object: dest,
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}, minio.CopySrcOptions{
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Bucket: s.config.S3BucketName,
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Object: name,
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}); err != nil {
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return err
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}
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return nil
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} else {
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fileContent, err := os.ReadFile(filepath.Join(s.config.Path, name))
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if err != nil {
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return err
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}
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if err := os.WriteFile(filepath.Join(s.config.Path, dest), fileContent, 0600); err != nil {
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return err
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}
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return nil
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}
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}
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// Rename is a wrapper over the Move function.
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func (s *Storage) Rename(name, dest string) error {
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return s.Move(name, dest)
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}
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// Move moves a file from one place to another.
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// It takes a file name, and the destination name as its parameter.
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// The function returns an error, if any.
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func (s *Storage) Move(name string, dest string) error {
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if s.s3Client != nil {
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if _, err := s.s3Client.CopyObject(s.ctx, minio.CopyDestOptions{
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Bucket: s.config.S3BucketName,
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Object: dest,
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}, minio.CopySrcOptions{
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Bucket: s.config.S3BucketName,
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Object: name,
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}); err != nil {
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return err
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}
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if err := s.s3Client.RemoveObject(s.ctx, s.config.S3BucketName, name, minio.RemoveObjectOptions{}); err != nil {
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return err
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}
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return nil
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} else {
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return os.Rename(filepath.Join(s.config.Path, name), filepath.Join(s.config.Path, dest))
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}
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}
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// ReadDir reads all files within a certain directory.
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// It takes a folder name as its parameter.
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// The function returns an array of FileInfo, and an error, if any.
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func (s *Storage) ReadDir(name string) ([]FileInfo, error) {
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var fileInfo []FileInfo
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if s.s3Client != nil {
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for object := range s.s3Client.ListObjects(s.ctx, s.config.S3BucketName, minio.ListObjectsOptions{
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Prefix: name + "/",
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}) {
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if object.Err != nil {
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minioErr := minio.ToErrorResponse(object.Err)
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if minioErr.Code == "NoSuchKey" {
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return nil, ErrFolderNotFound
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}
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return nil, object.Err
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}
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fileInfo = append(fileInfo, FileInfo{
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Name: object.Key,
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Size: object.Size,
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ModTime: object.LastModified,
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Mode: fs.FileMode(0777),
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IsDir: object.Size == 0,
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})
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}
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} else {
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dirInfo, err := os.ReadDir(filepath.Join(s.config.Path, name))
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if err != nil {
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if errors.Is(err, fs.ErrNotExist) {
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return nil, ErrFolderNotFound
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}
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return nil, err
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}
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for _, fInfo := range dirInfo {
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info, err := fInfo.Info()
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if err != nil {
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return nil, err
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}
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fileInfo = append(fileInfo, FileInfo{
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Name: info.Name(),
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Size: info.Size(),
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ModTime: info.ModTime(),
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Mode: info.Mode(),
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IsDir: info.IsDir(),
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})
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}
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}
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return fileInfo, nil
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}
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// CopyDir copies a directory from one place to another.
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// It takes a folder nae, and the destination folder name as its parameter.
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// The function returns an error, if any.
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func (s *Storage) CopyDir(name string, dst string) error {
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if s.s3Client != nil {
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var fileInfo []FileInfo
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for object := range s.s3Client.ListObjects(s.ctx, s.config.S3BucketName, minio.ListObjectsOptions{
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Prefix: name + "/",
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Recursive: true,
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}) {
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if object.Err != nil {
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minioErr := minio.ToErrorResponse(object.Err)
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if minioErr.Code == "NoSuchKey" {
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return ErrFolderNotFound
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}
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return object.Err
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}
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fileInfo = append(fileInfo, FileInfo{
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Name: object.Key,
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Size: object.Size,
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ModTime: object.LastModified,
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Mode: fs.FileMode(0777),
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IsDir: object.Size == 0,
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})
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}
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for _, object := range fileInfo {
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cutStr, _ := strings.CutPrefix(object.Name, name+"/")
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if _, err := s.s3Client.CopyObject(s.ctx, minio.CopyDestOptions{
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Bucket: s.config.S3BucketName,
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Object: dst + "/" + cutStr,
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}, minio.CopySrcOptions{
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Bucket: s.config.S3BucketName,
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Object: object.Name,
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}); err != nil {
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return err
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}
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}
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return nil
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} else {
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return os.Rename(filepath.Join(s.config.Path, name), filepath.Join(s.config.Path, dst))
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}
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}
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// DeleteDir deletes all files within a certain directory.
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// It takes a folder name as its parameter.
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// The function returns an error, if any.
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func (s *Storage) DeleteDir(name string) error {
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if s.s3Client != nil {
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objChan := s.s3Client.ListObjects(s.ctx, s.config.S3BucketName, minio.ListObjectsOptions{Prefix: name + "/", Recursive: true})
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for remObjErr := range s.s3Client.RemoveObjects(s.ctx, s.config.S3BucketName, objChan, minio.RemoveObjectsOptions{}) {
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if remObjErr.Err != nil {
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minioErr := minio.ToErrorResponse(remObjErr.Err)
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if minioErr.Code == "NoSuchKey" {
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return ErrFolderNotFound
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} else {
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return remObjErr.Err
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}
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}
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}
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return nil
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} else {
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return os.RemoveAll(filepath.Join(s.config.Path, name))
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}
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}
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