qz-vue.js

import qz from 'qz-tray'
const jwa = require('jwa')
class QzPrint {
  static config = null

  // TODO: setupSig can safely be combined with setupCert if needed
  static async setupSig () {
    // TODO: move private key to flat file, read using AJAX/fetch/etc
    // privateKey = fs.readFileSync(__dirname + '/private-key.pem');
    var privateKey = '-----BEGIN PRIVATE KEY-----\n''

    const ecdsa = jwa('RS512') // this needs to be imported

    qz.security.setSignatureAlgorithm('SHA512') // Since 2.1
    qz.security.setSignaturePromise(function (toSign) {
      return function (resolve, reject) {
        try {
          const hex = ecdsa.sign(toSign, privateKey)
          // Crude base64URL to base64 conversion ? :)
          const hex2 = hex.replace(/_/g, '/').replace(/-/g, '+')
          console.log(hex2)
          resolve(hex2)
        } catch (err) {
          console.error(err)
          reject(err)
        }
      }
    })
  }

  static setupCert () {
    qz.security.setCertificatePromise(function (resolve, reject) {

      // TODO: Move certificate to dedicated file, import using AJAX/fetch/etc :)
      resolve('-----BEGIN CERTIFICATE-----\n' + ...);
        
    })
  }

  static connect () {
    return qz.websocket.connect()
  }

  static disconnect () {
    return qz.websocket.disconnect()
  }

  static async listPrinters () {
    const list = await qz.printers.find()
    if (Array.isArray(list)) {
      return list
    } else {
      return [list]
    }
  }

  static async selectPrinter (printer) {
    QzPrint.config = await qz.configs.create(printer)
  }

  static print (label) {
    return qz.print(QzPrint.config, [label])
  }
}

export default QzPrint