Squash merge audio-player-component into main

backend/library/coverart.go

@@ -0,0 +1,80 @@
+package library
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"yellowjacket/backend/metadata"
+	"yellowjacket/backend/system"
+)
+
+// saveCoverArt saves embedded cover art to the cache directory.
+// Returns the file path where the art was saved, or empty string if no picture data.
+func (l *Library) saveCoverArt(pic *metadata.PictureData) (string, error) {
+	if pic == nil || len(pic.Data) == 0 {
+		return "", nil
+	}
+
+	// Get the data directory for storing cover art
+	dataDir, err := system.GetUserDataDirPath()
+	if err != nil {
+		return "", fmt.Errorf("could not get user data directory: %w", err)
+	}
+
+	coverDir := filepath.Join(dataDir, "covers")
+
+	// Ensure directory exists
+	if err := os.MkdirAll(coverDir, 0o755); err != nil {
+		return "", fmt.Errorf("could not create covers directory: %w", err)
+	}
+
+	// Generate filename from content hash (deduplication)
+	hash := sha256.Sum256(pic.Data)
+	hashStr := hex.EncodeToString(hash[:8]) // First 8 bytes = 16 hex chars
+
+	ext := pic.Ext
+	if ext == "" {
+		// Determine extension from MIME type
+		ext = extensionFromMIME(pic.MIMEType)
+	}
+
+	filename := fmt.Sprintf("%s.%s", hashStr, ext)
+	filePath := filepath.Join(coverDir, filename)
+
+	// Skip if already exists (same content hash)
+	if _, err := os.Stat(filePath); err == nil {
+		l.logger.Debug("cover art already exists", "path", filePath)
+
+		return filePath, nil
+	}
+
+	// Write file
+	if err := os.WriteFile(filePath, pic.Data, 0o644); err != nil {
+		return "", fmt.Errorf("could not write cover art: %w", err)
+	}
+
+	l.logger.Debug("saved cover art", "path", filePath, "size", len(pic.Data))
+
+	return filePath, nil
+}
+
+// extensionFromMIME returns a file extension for common image MIME types.
+func extensionFromMIME(mimeType string) string {
+	switch mimeType {
+	case "image/jpeg":
+		return "jpg"
+	case "image/png":
+		return "png"
+	case "image/gif":
+		return "gif"
+	case "image/webp":
+		return "webp"
+	case "image/bmp":
+		return "bmp"
+	default:
+		return "jpg" // Default to jpg
+	}
+}