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namae/api/services/dns.ts

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import dns from 'dns'
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) => {
dns.resolve4(hostname, function(err, addresses) {
if (err) return reject(err)
resolve(addresses)
})
})
}
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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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}
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 res.status(200).json({ availability: true })
}
sendError(res, err)
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}
}