mary_embed.php

<?php 

function embedMaryGerman($input) {
  embedMaryTTS($input, 'de');
}

function embedMaryTTS($input, $locale) {
  $key = getenv('MARYTTS_HMAC_SECRET');
  $keyBytes = base64_decode($key);

  $baseUrl = getenv('MARYTTS_URL');

  $src = $baseUrl . '?';

  $expires = time() + 120;
  $stringToSign = $input . $locale . $expires;

  $signatureBytes = hash_hmac ("sha256", $stringToSign, $keyBytes, true);
  $signature = base64_encode($signatureBytes);

  $src .= "text=" . urlencode($input);
  $src .= "&locale=" . urlencode($locale);
  $src .= "&expires=" . urlencode($expires);
  $src .= "&signature=" . urlencode($signature);

  ?>
  <audio autoplay>
    <source src="<?php echo($src); ?>" type="audio/wav">
    <embed height="100" width="100" src="<?php echo($src); ?>" type="audio/x-wav" autostart=true loop=1 >
  </audio>
  <?php	
}
?>