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import type {
AuthenticationExtensionsClientInputs,
PublicKeyCredentialRequestOptionsJSON,
PublicKeyCredentialDescriptorJSON,
UserVerificationRequirement,
} from '@simplewebauthn/typescript-types';
import base64url from 'base64url';
import generateChallenge from '../helpers/generateChallenge';
type Options = {
allowCredentials: PublicKeyCredentialDescriptorJSON[];
challenge?: string | Buffer;
timeout?: number;
userVerification?: UserVerificationRequirement;
extensions?: AuthenticationExtensionsClientInputs;
rpID?: string;
};
/**
* Prepare a value to pass into navigator.credentials.get(...) for authenticator "login"
*
* @param allowCredentials Authenticators previously registered by the user
* @param challenge Random value the authenticator needs to sign and pass back
* user for assertion
* @param timeout How long (in ms) the user can take to complete assertion
* @param userVerification Set to `'discouraged'` when asserting as part of a 2FA flow, otherwise
* set to `'preferred'` or `'required'` as desired.
* @param extensions Additional plugins the authenticator or browser should use during assertion
* @param rpID Valid domain name (after `https://`)
*/
export default function generateAssertionOptions(
options: Options,
): PublicKeyCredentialRequestOptionsJSON {
const {
allowCredentials,
challenge = generateChallenge(),
timeout = 60000,
userVerification,
extensions,
rpID,
} = options;
return {
challenge: base64url.encode(challenge),
allowCredentials,
timeout,
userVerification,
extensions,
rpId: rpID,
};
}
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