Add storage block geometry to audit and viewer

audit/internal/webui/viewer_snapshot.go

@@ -0,0 +1,62 @@
+package webui
+
+import (
+	"encoding/json"
+	"strconv"
+)
+
+func enrichSnapshotForViewer(snapshot []byte) []byte {
+	if len(snapshot) == 0 {
+		return snapshot
+	}
+	var root map[string]any
+	if err := json.Unmarshal(snapshot, &root); err != nil {
+		return snapshot
+	}
+	hardware, _ := root["hardware"].(map[string]any)
+	if len(hardware) == 0 {
+		return snapshot
+	}
+	storage, _ := hardware["storage"].([]any)
+	if len(storage) == 0 {
+		return snapshot
+	}
+	changed := false
+	for _, item := range storage {
+		row, _ := item.(map[string]any)
+		if len(row) == 0 {
+			continue
+		}
+		if _, exists := row["block_format"]; exists {
+			continue
+		}
+		logical, okLogical := jsonNumberToInt64(row["logical_block_size_bytes"])
+		metadata, okMetadata := jsonNumberToInt64(row["metadata_bytes_per_block"])
+		if !okLogical || !okMetadata || logical <= 0 || metadata < 0 {
+			continue
+		}
+		row["block_format"] = strconv.FormatInt(logical, 10) + "+" + strconv.FormatInt(metadata, 10)
+		changed = true
+	}
+	if !changed {
+		return snapshot
+	}
+	out, err := json.Marshal(root)
+	if err != nil {
+		return snapshot
+	}
+	return out
+}
+
+func jsonNumberToInt64(v any) (int64, bool) {
+	switch x := v.(type) {
+	case float64:
+		return int64(x), true
+	case int64:
+		return x, true
+	case int:
+		return int64(x), true
+	default:
+		return 0, false
+	}
+}