2020-08-20 00:57:33 +09:00
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import dns from 'dns'
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import { send, sendError } from '../../../util/http'
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import { NowRequest, NowResponse } from '@vercel/node'
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2019-07-31 03:04:11 +09:00
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2019-08-30 16:40:22 +09:00
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function resolvePromise(hostname: string): Promise<string[]> {
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2019-07-31 03:04:11 +09:00
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return new Promise((resolve, reject) => {
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2020-06-19 16:15:53 +09:00
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dns.resolve4(hostname, function (err, addresses) {
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2020-08-20 00:57:33 +09:00
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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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2019-07-31 03:04:11 +09:00
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}
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2019-12-24 01:57:07 +09:00
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export default async function handler(
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req: NowRequest,
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2020-08-20 00:57:33 +09:00
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res: NowResponse
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2019-12-24 01:57:07 +09:00
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): Promise<void> {
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2020-08-20 00:57:33 +09:00
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const { query } = req.query
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2019-07-31 03:04:11 +09:00
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2020-06-19 16:15:53 +09:00
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if (!query || typeof query !== 'string') {
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2020-08-20 00:57:33 +09:00
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return sendError(res, new Error('No query given'))
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2019-07-31 03:04:11 +09:00
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}
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try {
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2020-08-20 00:57:33 +09:00
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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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2019-07-31 03:04:11 +09:00
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} catch (err) {
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2019-07-31 18:42:07 +09:00
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if (err.code === 'ENODATA' || err.code === 'ENOTFOUND') {
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2020-08-20 00:57:33 +09:00
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return send(res, { availability: true })
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2019-07-31 03:04:11 +09:00
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}
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2020-08-20 00:57:33 +09:00
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sendError(res, err)
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2019-07-31 03:04:11 +09:00
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}
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}
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