jwtEmailClaim function

String? jwtEmailClaim(
  1. String idToken
)

The email claim of a JWT payload's middle segment, or null when the token is not a three-segment JWT, the payload is not a JSON object, or the claim is absent/empty/non-string. The ONE claim reader behind the account-identity entry naming (ChatGPT hosts via ChatGptOAuthCredentials.idToken, AIIN via aiinJwtEmail, fa_ui's SSO bundle) — a single parser so the copies cannot drift (issue #1326 review, thread 10).

Implementation

String? jwtEmailClaim(String idToken) {
  final email = jwtPayloadClaims(idToken)?['email'];
  return email is String && email.isNotEmpty ? email : null;
}