core&ui: add webauthn support (#484)

Co-authored-by: panda <panda_dtdyy@outlook.com>
Co-authored-by: undefined <i@undefined.moe>

packages/hydrooj/src/lib/verifyTFA.ts

@@ -0,0 +1,8 @@
+import notp from 'notp';
+import b32 from 'thirty-two';
+
+export function verifyTFA(secret: string, code?: string) {
+    if (!code || !code.length) return null;
+    const bin = b32.decode(secret);
+    return notp.totp.verify(code.replace(/\W+/g, ''), bin);
+}