dbgate/packages/api/src/utility/connectUtility.js

const { SSHConnection } = require('node-ssh-forward');
const portfinder = require('portfinder');
const { decryptConnection } = require('./crypting');

async function connectUtility(driver, storedConnection) {
  let connection = decryptConnection(storedConnection);
  if (connection.useSshTunnel) {
    const sshConfig = {
      endHost: connection.sshHost || '',
      endPort: connection.sshPort || 22,
      bastionHost: '',
      agentForward: false,
      passphrase: undefined,
      username: connection.sshLogin,
      password: connection.sshPassword,
      skipAutoPrivateKey: true,
      noReadline: true,
    };

    const sshConn = new SSHConnection(sshConfig);
    const localPort = await portfinder.getPortPromise({ port: 10000, stopPort: 60000 });
    // workaround for `getPortPromise` not releasing the port quickly enough
    await new Promise(resolve => setTimeout(resolve, 500));
    const tunnelConfig = {
      fromPort: localPort,
      toPort: connection.port,
      toHost: connection.server,
    };
    const tunnel = await sshConn.forward(tunnelConfig);
    console.log(`Created SSH tunnel to ${connection.sshHost}-${connection.server}:${connection.port}, using local port ${localPort}`)

    connection = {
      ...connection,
      server: '127.0.0.1',
      port: localPort,
    };
  }

  const conn = await driver.connect(connection);
  return conn;
}

module.exports = connectUtility;