class_URL.inc

<?php
/*
  This code is part of FusionDirectory (http://www.fusiondirectory.org/)

  Copyright (C) 2018-2019  FusionDirectory

  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 2 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, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/

/*!
 * \brief Class URL
 * Static methods to get/build URLs
 */

class URL
{
  /*! \brief Returns TRUE if SSL was used to contact FD, whether directly or through a proxy
   */
  public static function sslOn (): bool
  {
    if (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
      return (strcasecmp($_SERVER['HTTP_X_FORWARDED_PROTO'], 'https') == 0);
    }
    if (isset($_SERVER['HTTPS'])) {
      return (strcasecmp($_SERVER['HTTPS'], 'on') == 0);
    }
    return FALSE;
  }

  protected static function gatherInfos (): array
  {
    $protocol = 'http';
    if (static::sslOn()) {
      $protocol .= 's';
    }

    if (!empty($_SERVER['HTTP_X_FORWARDED_HOST'])) {
      $host = $_SERVER['HTTP_X_FORWARDED_HOST'];
      if (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
        $protocol = $_SERVER['HTTP_X_FORWARDED_PROTO'];
      }
      if (isset($_SERVER['HTTP_X_FORWARDED_PORT'])) {
        $port = $_SERVER['HTTP_X_FORWARDED_PORT'];
      } else {
        $port = ($protocol === 'http' ? 80 : 443);
      }
    } else {
      if (!empty($_SERVER['HTTP_HOST'])) {
        $host = $_SERVER['HTTP_HOST'];
      } else {
        $host = $_SERVER['SERVER_NAME'];
      }
      $port = $_SERVER['SERVER_PORT'];
    }

    return [$protocol, $host, $port];
  }