Function decodeJwtPayload

packages/core/sdk/src/oauth-helpers.ts:478–491

(token: string)

};

const decodeJwtPayload = (token: string): Readonly<Record<string, unknown>> | null => {
  const payload = token.split(".")[1];
  if (!payload) return null;
  if (!/^[A-Za-z0-9_-]+$/.test(payload) || payload.length % 4 === 1) return null;
  const base64 = payload.replaceAll("-", "+").replaceAll("_", "/");
  const padded = base64.padEnd(base64.length + ((4 - (base64.length % 4)) % 4), "=");
  // atob yields latin1 code units; JWT payloads are UTF-8 bytes, so re-decode
  // them properly or non-ASCII claim values (accented emails, names) garble.
  const utf8 = new TextDecoder().decode(
    Uint8Array.from(globalThis.atob(padded), (char) => char.charCodeAt(0)),
  );
  const decoded = decodeJwtClaims(utf8);
  return Option.isSome(decoded) ? decoded.value : null;
};

export const idTokenIdentityLabel = (idToken: string | undefined): string | undefined => {
  if (!idToken) return undefined;