sinProject-Inc/talk

import * as dns from 'dns'
import * as util from 'util'

export class ClientHostName {
    public constructor(private readonly _client_address: string) {}

    public async reverse(): Promise<string> {
        const reverse_dns = util.promisify(dns.reverse)

        try {
            const hostnames = await reverse_dns(this._client_address)

            if (hostnames === undefined || !hostnames[0]) return ''

            return hostnames[0]
        } catch (e) {
            // eslint-disable-next-line no-console
            console.warn('Reverse DNS lookup failed.', e)

            return ''
        }
    }
}