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index.js
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index.js
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const { createSecureContext, connect } = require('tls');
/**
*
* @param {{hostname: string, port: number, version: string}} o
*/
function tlsCheck({ hostname, port, version }) {
return new Promise((resolve, reject) => {
const secureContext = createSecureContext({ minVersion: version, maxVersion: version });
const opt = {
host: hostname,
servername: hostname,
port: port || 443,
secureContext,
}
const socket = connect(opt, () => {
if (!socket.authorized) {
reject(socket.authorizationError);
return;
}
const cipher = socket.getCipher();
cipher.tlsProtocol = socket.getProtocol();
socket.end();
resolve(cipher);
});
socket.on('error', e => reject(e));
});
}
module.exports = tlsCheck;