app.post('/sign-async/:id', (req, res)=> {
  const id = req.params.id // training id
  const certificate_ids = req.body.certificate_ids // array of tcs->id
  const certificate_tokens = req.body.certificate_tokens // array of tcs->id
  const front_signer_cities = req.body.front_signer_cities
  const back_signer_cities = req.body.back_signer_cities
  const signer_id = req.body.signer_id
  const signer_pass = req.body.signer_pass
  const signer_page = req.body.signer_page // 1 or 2
  if(id && certificate_ids && front_signer_cities && back_signer_cities && signer_id && signer_pass && signer_page){
    res.send({
      'status':'success',
      'message':'dokumen sedang ditandatangani..'
    })
    const dir = base_dir + '/' + id
    //const endpoint_url = 'https://10.242.77.232/api/sign/pdf'
    const endpoint_url = 'https://esign.kemenkeu.go.id/api/sign/pdf'
    const endpoint_username = 'bsre'
    const endpoint_password = 'securetransactions!!!'
    certificate_ids.forEach((certificate_id, index, array) => {
      let certificate_link = "https://semantik.bppk.kemenkeu.go.id/api/v2/open/certificate?token="+certificate_tokens[certificate_id]+"&status=final"
      let source = dir + '/' + certificate_id + '-draft.pdf'
      let target = dir + '/' + certificate_id + '-partial.pdf'
      if (signer_page==1){
        source = dir + '/' + certificate_id + '-partial.pdf'
        target = dir + '/' + certificate_id + '.pdf'
      }
      let signer_city = front_signer_cities[index]
      if (signer_page==2) signer_city = back_signer_cities[index]
      try{
        fs.readFile(source, (error, pdf) => {
          if (!error) {
            let form = new formData();
            form.append('file', fs.createReadStream(source), {
              filename: certificate_id + '.pdf'
            });
            axios.create({
              headers: form.getHeaders()
            }).post(endpoint_url, form, {
                params: {
                  'nik': encodeURI(signer_id),
                  'passphrase': encodeURI(signer_pass),
                  'tampilan': 'visible',
                  'jenis_dokumen': encodeURI('sertifikat pelatihan'),
                  'nomor': encodeURI('1234'),
                  'tujuan': encodeURI('peserta pelatihan'),
                  'perihal': encodeURI('sertifikat pelatihan'),
                  'info': encodeURI('informasi'),
                  'image': false,
                  'linkQR': encodeURI(certificate_link),
                  'halaman': 'PERTAMA',
                  'teks': 'teks',
                  'xAxis': 40,
                  'yAxis': 30,
                  'width': 400,
                  'height': 120
                },
                auth: {
                  username: endpoint_username,
                  password: endpoint_password
                },
                responseType: "stream"
              }
            ).then( (response) => {
              response.data.pipe(fs.createWriteStream(target));
              log('write ' + target + ' success');
            })
            .catch((response) => {
              log(response)
              log('write ' + target + ' failure');
            });
          }
        })
      } catch (error) {
        log(error)
      }
    })

  }
  else{
    log(id+'='+certificate_ids+'='+signer_id+'='+signer_pass+'='+signer_page)
    res.send({
      'status':'error',
      'message':'data parameter tidak lengkap'
    })
  }
  res.end()
})