change ids

ownership_middleware.go

@@ -156,9 +156,12 @@ func OwnershipProxyMiddleware(pool *SyncedPool) func(http.Handler) http.Handler
 func extractCartIdFromRequest(r *http.Request) (CartId, bool) {
 	// Cookie
 	if c, err := r.Cookie("cartid"); err == nil && c.Value != "" {
-		if cid, _, _, err2 := CanonicalizeOrLegacy(c.Value); err2 == nil {
-			return CartIDToLegacy(cid), true
+		if parsed, ok := ParseCartId(c.Value); ok {
+			return parsed, true
 		}
+		// Invalid existing cookie value: issue a fresh id (breaking change behavior)
+		newId := MustNewCartId()
+		return newId, true
 	}
 	// Path-based: locate "byid" segment
 	parts := splitPath(r.URL.Path)
@@ -166,8 +169,8 @@ func extractCartIdFromRequest(r *http.Request) (CartId, bool) {
 		if parts[i] == "byid" && i+1 < len(parts) {
 			raw := parts[i+1]
 			if raw != "" {
-				if cid, _, _, err := CanonicalizeOrLegacy(raw); err == nil {
-					return CartIDToLegacy(cid), true
+				if parsed, ok := ParseCartId(raw); ok {
+					return parsed, true
 				}
 			}
 		}