microbin/templates/auth_pasta.html

{% include "header.html" %}

{% if encrypt_client %}

<form id="auth-form" method="POST" action="/{{path}}/{{id}}" enctype="multipart/form-data">
  <label for="password"> Please enter the password to open the upload. <sup>
      <a href="/guide#encryption">﹖</a></sup></label>
  <input id="password-field" placeholder="Password" type="password" autocomplete="off">
  <input id="password-hidden" name="password" type="hidden">
  <button>Open</button>
</form>

<script>

  const form = document.getElementById("auth-form");
  const passwordField = document.getElementById("password-field");
  const passwordHiddenField = document.getElementById("password-hidden");

  form.onsubmit = function () {
    let key = decryptWithPassword(passwordField.value, "{{ encrypted_key }}");

    if (key) {
      passwordHiddenField.value = key;
    }
  };

  function decryptWithPassword(password, encryptedHex) {
    const passwordBytes = aesjs.utils.utf8.toBytes(password.padStart(32, "#"));
    const encryptedBytes = aesjs.utils.hex.toBytes(encryptedHex);
    const aesCtr = new aesjs.ModeOfOperation.ctr(passwordBytes);
    const decryptedBytes = aesCtr.decrypt(encryptedBytes);
    const res = aesjs.utils.utf8.fromBytes(decryptedBytes);

    if (res.endsWith("!0K")) {
      return res.substring(0, res.length - "!0K".length);
    } else {
      return null;
    }
  }
</script>

{% else %}

<form id="auth-form" method="POST" action="/{{path}}/{{id}}" enctype="multipart/form-data">
  <label for="password" style="margin-bottom: 0.5rem;"> Please enter the
    password to access or modify this upload. <sup>
      <a href="/guide#encryption">﹖</a></sup></label>
  <input id="password-field" placeholder="Password" name="password" type="password" autocomplete="off" />
  <button>Okay</button>

  {% if status == "incorrect" %}
  <p>
    Incorrect password.
  </p>
  {% endif %}

</form>

{% endif %}

{% include "footer.html" %} {% if !args.pure_html %}
<style>
  #auth-form {
    background-color: #f7f7f7;
    border-radius: 6px;
    padding: 10px;
    width: fit-content;
    margin: auto;
    margin-top: 2rem;
    margin-bottom: 2rem;
  }
</style>
{% endif %}