modCaptchaStandard.class.php

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<?php
/* Copyright (C) 2006-2011  Laurent Destailleur     <eldy@users.sourceforge.net>
 * Copyright (C) 2024   Frédéric France     <frederic.france@free.fr>
 * Copyright (C) 2024   MDW           <mdeweerd@users.noreply.github.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 * or see https://www.gnu.org/
 */
 
require_once DOL_DOCUMENT_ROOT.'/core/modules/security/captcha/modules_captcha.php';
require_once DOL_DOCUMENT_ROOT.'/core/modules/security/generate/modGeneratePassStandard.class.php';
 
 
class modCaptchaStandard extends ModeleCaptcha
{
  public $id;
 
  public $picto = 'fa-shield-alt';
 
  public function __construct($db, $conf, $langs, $user)
  {
    $this->id = strtolower(preg_replace('/^modCaptcha/i', '', get_class($this)));
 
    $this->db = $db;
    $this->conf = $conf;
    $this->langs = $langs;
    $this->user = $user;
  }
 
  public function getDescription()
  {
    global $langs;
    return $langs->trans("DolibarrStandardCaptcha");
  }
 
  public function getExample()
  {
    global $db, $conf, $langs, $user;
 
    $generator = new modGeneratePassStandard($db, $conf, $langs, $user);
    $generator->length = '5';
    $example = $generator->getExample();
 
    if (function_exists("imagecreate") && function_exists("imagepng")) {
      $img = imagecreate(80, 32);
      if (!$img) {
        return "Problem with GD creation";
      }
      $background_color = imagecolorallocate($img, 250, 250, 250); // do not comment this line
      $ecriture_color = imagecolorallocate($img, 0, 0, 0);
      imagestring($img, 4, 15, 8, $example, $ecriture_color);
 
      ob_start();
      imagepng($img);
      $image_data = ob_get_contents();
      ob_end_clean();
 
      return '<img class="inline-block valignmiddle" src="data:image/png;base64,' . base64_encode($image_data) . '" border="0" width="80" height="32" />';
    } else {
      // Image grise
      $image_data_base64 = 'iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAIAAAACUFjqAAAAFElEQVR4nGNsaGhgwA2Y8MiNYGkA22EBlPG3fjQAAAAASUVORK5CYII=';
      return '<img class="inline-block valignmiddle" src="data:image/png;base64,' . $image_data_base64 . '" border="0" width="80" height="32" />';
    }
  }
 
  public function getCaptchaCodeForForm($php_self = '')
  {
    global $langs;
 
    // Output the image by calling /core/antispamimage.php
    // This antispamimage also record the value of code into $_SESSION['dol_antispam_value'] so we will be able to validate by calling
    // validateCodeAfterLoginSubmit() later when we submit the login form.
 
    $out = '<!-- Captcha -->
    <div class="trinputlogin">
    <div class="tagtd tdinputlogin nowrap none valignmiddle">
 
    <span class="fa fa-unlock"></span>
    <span class="nofa span-icon-security inline-block">
    <input id="securitycode" placeholder="'.$langs->trans("SecurityCode").'" class="flat input-icon-security width125" type="text" maxlength="5" name="code" tabindex="3" autocomplete="off" />
    </span>
    <span class="nowrap inline-block">
    <img class="inline-block valignmiddle" src="'.DOL_URL_ROOT.'/core/antispamimage.php" border="0" width="80" height="32" id="img_securitycode" />
    <a class="inline-block valignmiddle" href="'.$php_self.'" tabindex="4" data-role="button" onclick="submitFormFromCaptcha(event)">'.img_picto($langs->trans("Refresh"), 'refresh', 'id="captcha_refresh_img"').'</a>
    </span>
 
    </div>
    </div>
 
    <script>
    function submitFormFromCaptcha(event) {
      console.log("submitFormFromCaptcha");
 
      // Prevent the default action of the link
      event.preventDefault();
      // Search the form
      const form = event.target.closest("form");
 
      // Submit the form if found
      if (form) {
        console.log("we set actionlogin to value \"disabled\"");
        document.getElementById("actionlogin").value = "disabled";
 
        form.submit();
      }
    }
    </script>
    <!-- End code for Captcha -->'."\n";
 
    return $out;
  }
 
 
 
  public function validateCodeAfterLoginSubmit()
  {
    $sessionkey = 'dol_antispam_value';   // The same key than set into the /core/antispamimage.php file.
 
    $ok = (array_key_exists($sessionkey, $_SESSION) && (strtolower($_SESSION[$sessionkey]) === strtolower(GETPOST('code', 'restricthtml')))) ? 1 : 0;
 
    return $ok;
  }
}