Ingest Form for Alma Digital

index.php

<?php
function alma_get($url) {
  $opts = [
    "http" => [
        "header" => "Accept: application/json\r\n" .
            "Authorization: apikey " . getenv('ALMA_APIKEY') . "\r\n"
    ]
  ];
  $context = stream_context_create($opts);
  $json = file_get_contents($url, false, $context);
  return json_decode($json);
}
$config = alma_get('https://api-na.hosted.exlibrisgroup.com/almaws/v1/conf/general?expand=ingest_form');
?>
<h1>Alma Digital Ingest</h1>
<p>Select your file:</p>
<form method="POST" enctype="multipart/form-data" action="<?= $config->digital->ingest_url ?>">
  <?php
    foreach($config->digital->ingest_form as $key => $value) {
      print "<input type='hidden' name='".$key."' value='".$value."'>";
    }
  ?>
  <input type="hidden" id="Content-Type" name="Content-Type">
  <input type="hidden" id="Content-MD5" name="Content-MD5">
  <input type=file id=file name=file>
  <p><button >Submit</button></p>
</form>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.0.0/crypto-js.min.js"></script>
<script>
  function calculateMD5(file) {
    return new Promise((resolve, reject) => {
      var reader = new FileReader();
      reader.onload = () => {
        try {
          const wordArray = CryptoJS.lib.WordArray.create(reader.result);   
          const result = CryptoJS.MD5(wordArray).toString(CryptoJS.enc.Base64);
          resolve(result);
        } catch (e) {
          console.error('error', e)
          reject(e)
        }
      };
      reader.readAsArrayBuffer(file);
    })
  }
  const form = document.forms[0];
  form.addEventListener('submit', async event => {
    event.preventDefault();
    const file = document.getElementById('file').files[0];
    const md5 = await calculateMD5(file);
    document.getElementById('Content-MD5').value = md5;
    form.submit();
  });
</script>