feat: enforce tenant content moderation

server/moderation/extractor.go

@@ -0,0 +1,34 @@
+package moderation
+
+import "strings"
+
+var visibleTextKeys = map[string]bool{
+	"txt": true, "text": true, "title": true, "caption": true,
+	"description": true, "file_name": true, "filename": true, "name": true,
+}
+
+func ExtractText(content any) string {
+	parts := make([]string, 0, 4)
+	var walk func(any, int, bool)
+	walk = func(value any, depth int, includeString bool) {
+		if depth > 6 || value == nil {
+			return
+		}
+		switch typed := value.(type) {
+		case string:
+			if text := strings.TrimSpace(typed); includeString && text != "" {
+				parts = append(parts, text)
+			}
+		case map[string]any:
+			for key, item := range typed {
+				walk(item, depth+1, visibleTextKeys[strings.ToLower(strings.TrimSpace(key))])
+			}
+		case []any:
+			for _, item := range typed {
+				walk(item, depth+1, includeString)
+			}
+		}
+	}
+	walk(content, 0, true)
+	return strings.TrimSpace(strings.Join(parts, "\n"))
+}