New Captcha Package added

packages/captcha/src/normalize.ts

@@ -0,0 +1,25 @@
+import type { CaptchaChallengeRecord, VerifyCaptchaInput } from "./types.ts";
+
+export function normalizeTextAnswer(value: unknown, caseSensitive: boolean): string {
+  const normalized = String(value ?? "")
+    .normalize("NFKC")
+    .trim()
+    .replace(/\s+/g, " ");
+  return caseSensitive ? normalized : normalized.toUpperCase();
+}
+
+export function normalizeSelections(values: unknown): string {
+  if (!Array.isArray(values)) return "";
+  return [...new Set(values.map((value) => String(value).trim()).filter(Boolean))].sort().join(",");
+}
+
+export function normalizedSubmittedAnswer(record: CaptchaChallengeRecord, input: VerifyCaptchaInput): string {
+  if (record.answerKind === "selections") return normalizeSelections(input.selections);
+  if (record.answerKind === "invisible") {
+    return JSON.stringify({
+      honeypot: String(input.honeypot ?? ""),
+      timingToken: String(input.timingToken ?? ""),
+    });
+  }
+  return normalizeTextAnswer(input.answer, record.caseSensitive);
+}