Major refactor to library

pkg/handlers/media.go

@@ -0,0 +1,52 @@
+package handlers
+
+import (
+	"net/http"
+	"path/filepath"
+)
+
+// ServeMedia serves media files with path traversal protection
+func (h *Handlers) ServeMedia(w http.ResponseWriter, r *http.Request) {
+	// Expected path format: /api/media/{accountID}/{filename}
+	path := r.URL.Path[len("/api/media/"):]
+
+	// Split path into accountID and filename
+	var accountID, filename string
+	for i, ch := range path {
+		if ch == '/' {
+			accountID = path[:i]
+			filename = path[i+1:]
+			break
+		}
+	}
+
+	if accountID == "" || filename == "" {
+		http.Error(w, "Invalid media path", http.StatusBadRequest)
+		return
+	}
+
+	// Construct full file path
+	filePath := filepath.Join(h.config.Media.DataPath, accountID, filename)
+
+	// Security check: ensure the resolved path is within the media directory
+	mediaDir := filepath.Join(h.config.Media.DataPath, accountID)
+	absFilePath, err := filepath.Abs(filePath)
+	if err != nil {
+		http.Error(w, "Invalid file path", http.StatusBadRequest)
+		return
+	}
+	absMediaDir, err := filepath.Abs(mediaDir)
+	if err != nil {
+		http.Error(w, "Invalid media directory", http.StatusInternalServerError)
+		return
+	}
+
+	// Check if file path is within media directory (prevent directory traversal)
+	if len(absFilePath) < len(absMediaDir) || absFilePath[:len(absMediaDir)] != absMediaDir {
+		http.Error(w, "Access denied", http.StatusForbidden)
+		return
+	}
+
+	// Serve the file
+	http.ServeFile(w, r, absFilePath)
+}