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import { toHash } from './toHash.ts';
import { isoUint8Array } from './iso/index.ts';
/**
* Go through each expected RP ID and try to find one that matches. Returns the unhashed RP ID
* that matched the hash in the response.
*
* Raises an `UnexpectedRPIDHash` error if no match is found
*/
export async function matchExpectedRPID(
rpIDHash: Uint8Array,
expectedRPIDs: string[],
): Promise<string> {
try {
const matchedRPID = await Promise.any<string>(
expectedRPIDs.map((expected) => {
return new Promise((resolve, reject) => {
toHash(isoUint8Array.fromASCIIString(expected)).then(
(expectedRPIDHash) => {
if (isoUint8Array.areEqual(rpIDHash, expectedRPIDHash)) {
resolve(expected);
} else {
reject();
}
},
);
});
}),
);
return matchedRPID;
} catch (err) {
const _err = err as Error;
// This means no matches were found
if (_err.name === 'AggregateError') {
throw new UnexpectedRPIDHash();
}
// An unexpected error occurred
throw err;
}
}
class UnexpectedRPIDHash extends Error {
constructor() {
const message = 'Unexpected RP ID hash';
super(message);
this.name = 'UnexpectedRPIDHash';
}
}
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