util function for verifiying hcaptcha token, sorry dom

index.ts

import fetch from 'node-fetch';
import qs from 'querystring';

enum ErrorCode {
	'missing-input-secret' = 'Your secret key is missing.',
	'invalid-input-secret' = 'Your secret key is invalid or malformed.',
	'missing-input-response' = 'The response parameter (verification token) is missing.',
	'invalid-input-response' = 'The response parameter (verification token) is invalid or malformed.',
	'bad-request' = 'The request is invalid or malformed.',
	'invalid-or-already-seen-response' = 'The response parameter has already been checked, or has another issue.',
	'sitekey-secret-mismatch' = 'The sitekey is not registered with the provided secret.',
}

export interface VerifyResponse {
	success: boolean;
	challenge_ts: number;
	hostname: string;
	credit: boolean;
	'error-codes': (keyof typeof ErrorCode)[];
}

export interface ErrorResponse {
	errors: typeof ErrorCode[keyof typeof ErrorCode][];
}

export async function verify(secret: string, response: string): Promise<VerifyResponse | ErrorResponse> {
	const query = qs.stringify({ secret, response });

	const res = await fetch(`https://hcaptcha.com/siteverify?${query}`, {
		method: 'POST',
	});

	const json: VerifyResponse = await res.json();
	if (json['error-codes'].length) return { errors: json['error-codes'].map(e => ErrorCode[e]) };
	return json;
}