claude: fold in old sow-tools

internal/music/config.go

@@ -0,0 +1,47 @@
+package music
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+)
+
+type DatasetConfig struct {
+	Source      string `json:"source" yaml:"source"`
+	Prefix      string `json:"prefix,omitempty" yaml:"prefix,omitempty"`
+	StageRoot   string `json:"stage_root,omitempty" yaml:"stage_root,omitempty"`
+	CreditsRoot string `json:"credits_root,omitempty" yaml:"credits_root,omitempty"`
+}
+
+type DefaultsConfig struct {
+	StageRoot      string `json:"stage_root,omitempty" yaml:"stage_root,omitempty"`
+	CreditsRoot    string `json:"credits_root,omitempty" yaml:"credits_root,omitempty"`
+	CreditsOverlay string `json:"credits_overlay,omitempty" yaml:"credits_overlay,omitempty"`
+	MaxStemLength  *int   `json:"max_stem_length,omitempty" yaml:"max_stem_length,omitempty"`
+}
+
+func ValidateDatasetSource(field, source string) error {
+	trimmed := strings.TrimSpace(source)
+	if trimmed == "" {
+		return fmt.Errorf("%s.source is required", field)
+	}
+	if strings.Contains(trimmed, "\x00") {
+		return fmt.Errorf("%s.source must not contain NUL bytes", field)
+	}
+	clean := filepath.Clean(filepath.FromSlash(trimmed))
+	if clean == ".." || strings.HasPrefix(clean, ".."+string(filepath.Separator)) {
+		return fmt.Errorf("%s.source must not escape project root", field)
+	}
+	return nil
+}
+
+func ValidateDatasetID(id string) error {
+	trimmed := strings.TrimSpace(id)
+	if trimmed == "" {
+		return fmt.Errorf("dataset id must not be empty")
+	}
+	if strings.Contains(trimmed, "/") || strings.Contains(trimmed, "\\") {
+		return fmt.Errorf("dataset id %q must not contain path separators", trimmed)
+	}
+	return nil
+}