success.mustache

{{> header}}
<div class="starter-template">
  <h1>Stop looking at the source code</h1>
  <p class="lead">
    Welcome to the problem page! Please enter the flag below.
  </p>
  <form id="flag-form">
    <div class="form-group">
      <input type="text" class="form-control" id="flag" placeholder="easyctf{">
    </div>
    <button type="submit" class="btn btn-success btn-lg">Check</button>
  </form>
</div>

<script class="delete">
  // Ah, old friend, we meet again...
  function process(a, b) {
    'use strict';
    var len = Math.max(a.length, b.length);
    var out = [];
    for (var i = 0, ca, cb; i < len; i++) {
      ca = a.charCodeAt(i % a.length);
      cb = b.charCodeAt(i % b.length);
      out.push(ca ^ cb);
    }
    return String.fromCharCode.apply(null, out);
  }

  (function () {
    'use strict';

    function soupd() {
      document.documentElement.innerHTML = '';
      location.replace('/soupd?2');
      setInterval(function () {
        location.replace('/soupd?12');
      }, 100);
    }

    try {
      let badNodes = document.getElementsByClassName('delete');
      for (let i = 0; i < badNodes.length; i++) {
        badNodes[i].parentNode.removeChild(badNodes[i]);
      }
    } catch (e) {}

    try {
      window.history.pushState({}, 'Stop looking at the source', '/');
    } catch (e) {}

    try {
      var element = new Image('/static/img/soup.png');
      Object.defineProperty(element, 'id', { get: function () {
        soupd();
      }});
      eval("console.log('Stop looking at the source code%c', element);");
    } catch (e) {}

    var formEl = document.getElementById('flag-form');
    var inputEl = document.getElementById('flag');

    var func = "(function (e, v) { e.preventDefault() || " +
        "alert(inputEl.value === process(this.prototype.flag, " +
        "this.prototype.key) ? 'Your flag is correct!' : " +
        "'Incorrect, try again.'); })";
    var f = 'DQ4cJgsbCVofB18sNw4wRlhfCwAbXxpTC1wwKVlcGBIaUDAGJzowYDoqTiI=';
    var p = { prototype: { flag: atob(f), key: 'heheheh!' }};

    document.addEventListener('DOMContentLoaded', function () {
      formEl.addEventListener('submit', eval(func).bind(p));
      $('.delete').remove();
    });

  })();
</script>
{{> footer}}