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import {
PublicKeyCredentialCreationOptionsJSON,
RegistrationCredential,
RegistrationResponseJSON,
PublicKeyCredentialFuture,
} from '@simplewebauthn/typescript-types';
import { utf8StringToBuffer } from '../helpers/utf8StringToBuffer';
import { bufferToBase64URLString } from '../helpers/bufferToBase64URLString';
import { base64URLStringToBuffer } from '../helpers/base64URLStringToBuffer';
import { browserSupportsWebAuthn } from '../helpers/browserSupportsWebAuthn';
import { toPublicKeyCredentialDescriptor } from '../helpers/toPublicKeyCredentialDescriptor';
import { identifyRegistrationError } from '../helpers/identifyRegistrationError';
import { webauthnAbortService } from '../helpers/webAuthnAbortService';
import { toAuthenticatorAttachment } from '../helpers/toAuthenticatorAttachment';
/**
* Begin authenticator "registration" via WebAuthn attestation
*
* @param creationOptionsJSON Output from @simplewebauthn/server's generateRegistrationOptions(...)
*/
export async function startRegistration(
creationOptionsJSON: PublicKeyCredentialCreationOptionsJSON,
): Promise<RegistrationResponseJSON> {
if (!browserSupportsWebAuthn()) {
throw new Error('WebAuthn is not supported in this browser');
}
const globalPublicKeyCredential =
window.PublicKeyCredential as unknown as PublicKeyCredentialFuture;
let publicKey: PublicKeyCredentialCreationOptions;
// We need to convert some values to Uint8Arrays before passing the credentials to the navigator
if (typeof globalPublicKeyCredential.parseCreationOptionsFromJSON === 'function') {
publicKey = globalPublicKeyCredential.parseCreationOptionsFromJSON(creationOptionsJSON);
} else {
publicKey = {
...creationOptionsJSON,
challenge: base64URLStringToBuffer(creationOptionsJSON.challenge),
user: {
...creationOptionsJSON.user,
id: utf8StringToBuffer(creationOptionsJSON.user.id),
},
excludeCredentials: creationOptionsJSON.excludeCredentials?.map(toPublicKeyCredentialDescriptor),
};
}
// Finalize options
const options: CredentialCreationOptions = { publicKey };
// Set up the ability to cancel this request if the user attempts another
options.signal = webauthnAbortService.createNewAbortSignal();
// Wait for the user to complete attestation
let credential;
try {
credential = (await navigator.credentials.create(options)) as RegistrationCredential;
} catch (err) {
throw identifyRegistrationError({ error: err as Error, options });
}
if (!credential) {
throw new Error('Registration was not completed');
}
// Use toJSON() if it's available in the browser
if (typeof credential.toJSON === 'function') {
return credential.toJSON() as RegistrationResponseJSON;
}
// Manually construct an instance of RegistrationResponseJSON
const { id, rawId, response, type } = credential;
return {
id,
rawId: bufferToBase64URLString(rawId),
response: {
attestationObject: bufferToBase64URLString(response.attestationObject),
clientDataJSON: bufferToBase64URLString(response.clientDataJSON),
transports: response.getTransports(),
},
type,
clientExtensionResults: credential.getClientExtensionResults(),
authenticatorAttachment: toAuthenticatorAttachment(credential.authenticatorAttachment),
};
}
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