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namae/api/services/dns.ts

31 lines
852 B
TypeScript

import dns from 'dns';
import {send, sendError, NowRequest, NowResponse} from '../util/http';
function resolvePromise(hostname: string): Promise<string[]> {
return new Promise((resolve, reject) => {
dns.resolve4(hostname, function(err, addresses) {
if (err) return reject(err);
resolve(addresses);
});
});
}
export default async function handler(req: NowRequest, res: NowResponse) {
const {query} = req.query;
if (!query) {
return sendError(res, new Error('no query given'));
}
try {
const response = await resolvePromise(query);
const availability = response && response.length > 0 ? false : true;
send(res, {availability});
} catch (err) {
if (err.code === 'ENODATA' || err.code === 'ENOTFOUND') {
return res.status(200).json({availability: true});
}
sendError(res, err);
}
}