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namae/api/services/dns/[query].ts

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