Fix valuation and data robustness bugs

1 files changed, 33 insertions, 0 deletions

diff --git a/utils/security.py b/utils/security.py
new file mode 100644
index 0000000..962422b
--- /dev/null
+++ b/utils/security.py
@@ -0,0 +1,33 @@
+"""Minimal helpers for safely rendering external text and URLs."""
+from html import escape
+from urllib.parse import urlparse
+
+
+def escape_html(value) -> str:
+    """Escape a value for HTML text or attribute contexts."""
+    if value is None:
+        return ""
+    return escape(str(value), quote=True)
+
+
+def validate_outbound_url(url: str | None) -> str | None:
+    """Allow only absolute http/https outbound URLs."""
+    if not url:
+        return None
+
+    candidate = str(url).strip()
+    if not candidate:
+        return None
+
+    parsed = urlparse(candidate)
+    if parsed.scheme not in {"http", "https"} or not parsed.netloc:
+        return None
+
+    return parsed.geturl()
+
+
+def json_for_script(value) -> str:
+    """Serialize JSON for safe embedding inside inline script tags."""
+    import json
+
+    return json.dumps(value).replace("</", "<\\/")