Function DecodeBase64Output

internal/sessions/transfer.go:318–331

DecodeBase64Output strips shell metadata and line-number prefixes from command output, then base64-decodes the result.

(output string)

// DecodeBase64Output strips shell metadata and line-number prefixes from
// command output, then base64-decodes the result.
func DecodeBase64Output(output string) ([]byte, error) {
	// 1. Strip shell metadata (exit code, wall time, "Output:" header).
	cleaned := stripShellMetadata(output)
	// 2. Strip line-number prefixes.
	cleaned = StripReadToolLineNumbers(cleaned)
	// 3. Remove all whitespace (base64 may be wrapped at 76 chars).
	cleaned = strings.Join(strings.Fields(cleaned), "")

	if cleaned == "" {
		return []byte{}, nil
	}

	return base64.StdEncoding.DecodeString(cleaned)
}