Initial commit

lib/sanitize.ts

@@ -0,0 +1,36 @@
+export function sanitizePlainText(value: string) {
+  return value
+    .replace(/[\u0000-\u001F\u007F]/g, "")
+    .replace(/\s+/g, " ")
+    .trim();
+}
+
+export function sanitizeOptionalPlainText(value: string | null | undefined) {
+  if (!value) {
+    return undefined;
+  }
+
+  const sanitized = sanitizePlainText(value);
+  return sanitized.length > 0 ? sanitized : undefined;
+}
+
+export function normalizeUsername(value: string) {
+  return sanitizePlainText(value).toLowerCase().replace(/^@+/, "");
+}
+
+export function safeUrl(value: string | null | undefined) {
+  if (!value) {
+    return undefined;
+  }
+
+  const sanitized = value.trim();
+  try {
+    const url = new URL(sanitized);
+    if (!["http:", "https:"].includes(url.protocol)) {
+      return undefined;
+    }
+    return sanitized;
+  } catch {
+    return undefined;
+  }
+}