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import { isoCBOR } from './iso/index.ts';
/**
* Convert authenticator extension data buffer to a proper object
*
* @param extensionData Authenticator Extension Data buffer
*/
export function decodeAuthenticatorExtensions(
extensionData: Uint8Array,
): AuthenticationExtensionsAuthenticatorOutputs | undefined {
let toCBOR: Map<string, unknown>;
try {
toCBOR = isoCBOR.decodeFirst(extensionData);
} catch (err) {
const _err = err as Error;
throw new Error(`Error decoding authenticator extensions: ${_err.message}`);
}
return convertMapToObjectDeep(toCBOR);
}
export type AuthenticationExtensionsAuthenticatorOutputs = {
devicePubKey?: DevicePublicKeyAuthenticatorOutput;
uvm?: UVMAuthenticatorOutput;
};
export type DevicePublicKeyAuthenticatorOutput = {
dpk?: Uint8Array;
sig?: string;
nonce?: Uint8Array;
scope?: Uint8Array;
aaguid?: Uint8Array;
};
// TODO: Need to verify this format
// https://w3c.github.io/webauthn/#sctn-uvm-extension.
export type UVMAuthenticatorOutput = {
uvm?: Uint8Array[];
};
/**
* CBOR-encoded extensions can be deeply-nested Maps, which are too deep for a simple
* `Object.entries()`. This method will recursively make sure that all Maps are converted into
* basic objects.
*/
function convertMapToObjectDeep(
input: Map<string, unknown>,
): { [key: string]: unknown } {
const mapped: { [key: string]: unknown } = {};
for (const [key, value] of input) {
if (value instanceof Map) {
mapped[key] = convertMapToObjectDeep(value);
} else {
mapped[key] = value;
}
}
return mapped;
}
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