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31 lines
841 B
TypeScript
31 lines
841 B
TypeScript
import dns from 'dns';
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import {send, sendError, NowRequest, NowResponse} from '../util/http';
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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);
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resolve(addresses);
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});
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});
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}
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export default async function handler(req: NowRequest, res: NowResponse) {
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const {query} = req.query;
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if (!query) {
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return sendError(res, new Error('No query given'));
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}
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try {
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const response = await resolvePromise(query);
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const availability = response && response.length > 0 ? false : true;
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send(res, {availability});
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} catch (err) {
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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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}
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}
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