| 37 | } |
| 38 | |
| 39 | func (RealFileSystem) ReadFile(name string) ([]byte, error) { |
| 40 | f, err := os.Open(name) |
| 41 | if err != nil { |
| 42 | return nil, err |
| 43 | } |
| 44 | defer f.Close() |
| 45 | |
| 46 | info, err := f.Stat() |
| 47 | if err != nil { |
| 48 | return nil, err |
| 49 | } |
| 50 | if info.IsDir() { |
| 51 | return nil, fmt.Errorf("path is a directory: %s", name) |
| 52 | } |
| 53 | if info.Size() > models.MaxSourceFileSize { |
| 54 | return nil, fmt.Errorf("file exceeds maximum supported size of %d bytes", models.MaxSourceFileSize) |
| 55 | } |
| 56 | |
| 57 | // Read one byte past the cap so an under-reported size can still be |
| 58 | // detected and rejected, rather than silently truncated. |
| 59 | limit := int64(models.MaxSourceFileSize + 1) |
| 60 | content, err := io.ReadAll(io.LimitReader(f, limit)) |
| 61 | if err != nil { |
| 62 | return nil, err |
| 63 | } |
| 64 | if len(content) > models.MaxSourceFileSize { |
| 65 | return nil, fmt.Errorf("file exceeds maximum supported size of %d bytes", models.MaxSourceFileSize) |
| 66 | } |
| 67 | return content, nil |
| 68 | } |