Build KarlDNS self-hosted DynDNS service

router_dyndns/web/html_utils.py

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+from __future__ import annotations
+
+import html
+
+
+class SafeHtml(str):
+    """HTML fragment that was built by trusted server-side template helpers."""
+
+
+def escape(value: object) -> str:
+    return html.escape(str(value), quote=True)
+
+
+def attr(value: object) -> str:
+    return escape(value)
+
+
+def trusted(fragment: str) -> SafeHtml:
+    return SafeHtml(fragment)
+
+
+def join_html(fragments: list[str]) -> SafeHtml:
+    return SafeHtml("".join(fragments))