Squash merge audio-player-component into main

backend/library/config.go

@@ -0,0 +1,43 @@
+// Package library manages the music library and its configuration.
+package library
+
+import (
+	"fmt"
+	"os"
+)
+
+// Config holds Library config data.
+type Config struct {
+	DirectoryPath Directory `form:"Directory" schema:"directory,required"`
+}
+
+// Directory represents a filesystem path to a music directory.
+type Directory string
+
+// NewConfig creates a validated library configuration.
+func NewConfig(dir string) (*Config, error) {
+	config := &Config{
+		DirectoryPath: Directory(dir),
+	}
+	if err := config.Validate(); err != nil {
+		return nil, fmt.Errorf("validation error for new library config: %w", err)
+	}
+
+	return config, nil
+}
+
+// Validate checks that the configured directory exists.
+func (c *Config) Validate() error {
+	if len(c.DirectoryPath) != 0 {
+		dirInfo, err := os.Stat(string(c.DirectoryPath))
+		if err != nil {
+			return fmt.Errorf("problem getting info on library dir (%s): %w", c.DirectoryPath, err)
+		}
+
+		if !dirInfo.IsDir() {
+			return fmt.Errorf("%s is not a directory", c.DirectoryPath)
+		}
+	}
+
+	return nil
+}