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index.js
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index.js
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'use strict';
const dns = require('dns');
const arrify = require('arrify');
const got = require('got');
const isPortReachable = require('is-port-reachable');
const pAny = require('p-any');
const pify = require('pify');
const pn = require('port-numbers');
const prependHttp = require('prepend-http');
const routerIps = require('router-ips');
const URL = require('url-parse');
const checkRedirection = url => {
return got(url).then(res => {
const redirectHostname = (new URL(res.headers.location || '')).hostname;
if (routerIps.has(redirectHostname)) {
return false;
}
return true;
});
};
module.exports = dests => {
return pAny(arrify(dests).map(url => {
url = new URL(prependHttp(url));
const hostname = url.hostname;
const protocol = url.protocol;
const port = url.port || pn.getPort(protocol.slice(0, -1)).port || 80;
return pify(dns.lookup)(hostname).then(address => {
if (!address) {
return false;
}
if (routerIps.has(address)) {
return false;
}
if (protocol === 'http' || protocol === 'https') {
return checkRedirection(url.toString());
}
return isPortReachable(port, {host: address});
});
})).catch(() => false);
};