126 lines
2.7 KiB
Go
126 lines
2.7 KiB
Go
package storage
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import (
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"fmt"
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"io"
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"mime/multipart"
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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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)
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type Client struct {
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RootDir string
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MaxObjectSize int64
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}
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func New(root string, maxObjectSize int64) (*Client, error) {
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if maxObjectSize <= 0 {
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return nil, fmt.Errorf("maxObjectSize must be greater than 0")
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}
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info, err := os.Stat(root)
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if os.IsNotExist(err) {
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return nil, fmt.Errorf("root directory does not exist: %s", root)
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}
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if err != nil {
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return nil, fmt.Errorf("failed to stat root directory: %v", err)
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}
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if !info.IsDir() {
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return nil, fmt.Errorf("root path is not a directory: %s", root)
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}
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testFile := filepath.Join(root, ".axiom-storage-check")
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f, err := os.Create(testFile)
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if err != nil {
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return nil, fmt.Errorf("root directory is not writable: %v", err)
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}
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f.Close()
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os.Remove(testFile)
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return &Client{
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RootDir: root,
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MaxObjectSize: maxObjectSize,
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}, nil
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}
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func (s *Client) getPath(bucket, key string) string {
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return filepath.Join(s.RootDir, bucket, key)
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}
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func (s *Client) CreateBucket(bucket string) error {
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path := filepath.Join(s.RootDir, bucket)
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return os.MkdirAll(path, 0755)
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}
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func (s *Client) PutObject(bucket, key string, reader io.Reader) error {
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fullPath := s.getPath(bucket, key)
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if err := os.MkdirAll(filepath.Dir(fullPath), 0755); err != nil {
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return err
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}
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f, err := os.Create(fullPath)
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if err != nil {
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return err
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}
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defer f.Close()
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limitedReader := io.LimitReader(reader, s.MaxObjectSize+1)
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written, err := io.Copy(f, limitedReader)
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if err != nil {
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return err
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}
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if written > s.MaxObjectSize {
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os.Remove(fullPath)
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return fmt.Errorf("object size exceeds maximum allowed: %d bytes", s.MaxObjectSize)
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}
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return nil
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}
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func (s *Client) GetObject(bucket, key string) (*os.File, error) {
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fullPath := s.getPath(bucket, key)
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return os.Open(fullPath)
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}
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func (s *Client) DeleteObject(bucket, key string) error {
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fullPath := s.getPath(bucket, key)
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return os.Remove(fullPath)
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}
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func DetectFileType(file multipart.File) (string, []byte, error) {
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const sniffLen = 512
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buffer := make([]byte, sniffLen)
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n, err := file.Read(buffer)
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if err != nil && err != io.EOF {
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return "", nil, err
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}
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if seeker, ok := file.(io.Seeker); ok {
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_, _ = seeker.Seek(0, io.SeekStart)
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} else {
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return "", nil, fmt.Errorf("file is not seekable")
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}
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mimeType := http.DetectContentType(buffer[:n])
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return mimeType, buffer[:n], nil
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}
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func VerifyFileType(file multipart.File, allowedMimeTypes []string) error {
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mimeType, _, err := DetectFileType(file)
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if err != nil {
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return err
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}
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for _, mt := range allowedMimeTypes {
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if strings.EqualFold(mimeType, mt) {
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return nil
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}
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}
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return fmt.Errorf("invalid file type: %s", mimeType)
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}
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