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import base64url from 'base64url';
/**
* Decode an authenticator's base64url-encoded clientDataJSON to JSON
*/
export default function decodeClientDataJSON(data: string): ClientDataJSON {
const toString = base64url.decode(data);
const clientData: ClientDataJSON = JSON.parse(toString);
// `challenge` will be Base64URL-encoded here. Decode it for easier comparisons with what is provided
// as the expected value
clientData.challenge = Buffer.from(clientData.challenge, 'base64').toString('ascii');
return clientData;
}
type ClientDataJSON = {
type: string;
challenge: string;
origin: string;
};
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