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import { CredentialDeviceType } from '@simplewebauthn/typescript-types';
/**
* Make sense of Bits 3 and 4 in authenticator indicating:
*
* - Whether the credential can be used on multiple devices
* - Whether the credential is backed up or not
*
* Invalid configurations will raise an `Error`
*/
export function parseBackupFlags({ be, bs }: { be: boolean, bs: boolean }): {
credentialDeviceType: CredentialDeviceType,
credentialBackedUp: boolean,
} {
const credentialBackedUp = bs;
let credentialDeviceType: CredentialDeviceType = 'singleDevice';
if (be) {
credentialDeviceType = 'multiDevice';
}
if (credentialDeviceType === 'singleDevice' && credentialBackedUp) {
throw new InvalidBackupFlags(
'Single-device credential indicated that it was backed up, which should be impossible.'
)
}
return { credentialDeviceType, credentialBackedUp };
}
class InvalidBackupFlags extends Error {
constructor(message: string) {
super(message);
this.name = 'InvalidBackupFlags';
}
}
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