<?php

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * Version 1.1.1

 * Copyright (C) 2006-2007 Dan Fuhry

 * Installation package

 * upgrade.php - Upgrade interface

 *

 * This program is Free Software; you can redistribute 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 details.

 */

define('IN_ENANO', 1);

// The list of versions in THIS AND PREVIOUS branches, in chronological order.

$enano_versions = array();

$enano_versions['1.0'] = array('1.0', '1.0.1', '1.0.2b1', '1.0.2', '1.0.3', '1.0.4');

$enano_versions['1.1'] = array('1.1.1', '1.1.2', '1.1.3');

// Turn on every imaginable API hack to make common load on older databases

define('IN_ENANO_UPGRADE', 1);

define('IN_ENANO_MIGRATION', 1);

define('ENANO_ALLOW_LOAD_NOLANG', 1);

@ini_set('display_errors', 'on');

// Load installer files

require_once('includes/sql_parse.php');

require_once('includes/common.php');

require_once('includes/libenanoinstall.php');

// when the installer's common is loaded, it runs chdir() to the ENANO_ROOT, thus making this Enano's common.php

require_once('includes/common.php');

@ini_set('display_errors', 'on');

$ui = new Enano_Installer_UI('Enano upgrader', false);

if ( version_compare(PHP_VERSION, '5.0.0', '<') )

{

  $ui->__construct('Enano upgrader', false);

}

$stg_welcome = $ui->add_stage('Welcome', true);

$stg_confirm = $ui->add_stage('Confirmation', true);

$stg_upgrade = $ui->add_stage('Perform upgrade', true);

$stg_finish  = $ui->add_stage('Finish', true);

$stg_php4 = $ui->add_stage('PHP4 compatibility notice', false);

if ( version_compare(PHP_VERSION, '5.0.0', '<') || isset($_GET['debug_warn_php4']) )

{

  $ui->set_visible_stage($stg_php4);

  $ui->step = '';

  $ui->show_header();

  // This isn't localized because all localization code is dependent on

  // PHP 5 (loading lang.php will throw a parser error under PHP4). This

  // one message probably doesn't need to be localized anyway.

  ?>

  <h2 class="heading-error">

    Your server doesn't have support for PHP 5.

  </h2>

  <p>

    PHP 5 is the latest version of the language on which Enano was built. Its many new features have been available since early 2004, yet

    many web hosts have not migrated to it because of the work involved. In 2007, Zend Corporation announced that support for the aging

    PHP 4.x would be discontinued at the end of the year. An initiative called <a href="http://gophp5.org/">GoPHP5</a> was started to

    encourage web hosts to migrate to PHP 5.

  </p>

  <p>

    Because of the industry's decision to not support PHP 4 any longer, the Enano team decided that it was time to begin using the powerful

    features of PHP 5 at the expense of PHP 4 compatibility. Therefore, this version of Enano cannot be installed on your server until it

    is upgraded to at least PHP 5.0.0, and preferably the latest available version.

    <!-- No, not even removing the check in this installer script will help. As soon as the PHP4 check is passed, the installer shows the

         language selection page, after which the language code is loaded. The language code and libjson2 will trigger parse errors under

         PHP <5.0.0. -->

  </p>

  <p>

    If you need to use Enano but can't upgrade your PHP because you're on a shared or reseller hosting service, you can use the

    <a href="http://enanocms.org/download?series=1.0">1.0.x series of Enano</a> on your site. While the Enano team attempts to make this

    older series work on PHP 4, official support is not provided for installations of Enano on PHP 4.

  </p>

  <?php

  $ui->show_footer();

  exit(0);

}

// Version check

if ( enano_version() == installer_enano_version() )

{

  $ui->show_header();

  echo '<h3>Already upgraded</h3>' . '<p>You don\'t need to migrate, you\'re already on <del>crack</del> the 1.1 platform.</p>';

  $ui->show_footer();

  exit();

}

// Start session manager

$session->start();

if ( !$session->user_logged_in || ( $session->user_logged_in && $session->auth_level < USER_LEVEL_ADMIN ) )

{

  if ( isset($_POST['do_login']) )

  {

    if ( !$session->user_logged_in )

    {

      $result = $session->login_without_crypto($_POST['username'], $_POST['password'], false, USER_LEVEL_MEMBER);

    }

    $result = $session->login_without_crypto($_POST['username'], $_POST['password'], false, USER_LEVEL_ADMIN);

    if ( $result['success'] )

    {

      header('HTTP/1.1 302 Some kind of redirect with implied no content');

      header('Location: ' . scriptPath . '/install/' . $session->append_sid('upgrade.php'));

      exit();

    }

  }

  $ui->show_header();

  ?>

  <h3>Authentication needed</h3>

  <?php

  echo '<form action="upgrade.php" method="post">';

  if ( isset($result) )

  {

    echo '<b>Session manager returned error:</b>' . '<pre>' . print_r($result, true) . '</pre>';

  }

  ?>

  <p>You need <?php if ( !$session->user_logged_in ) echo 'to be logged in and have '; ?>an active admin session to continue.</p>

  <p>

    Username:&nbsp;&nbsp;&nbsp;<input type="text" name="username" /><br />

    Password:&nbsp;&nbsp;&nbsp;<input type="password" name="password" /><br />

    <input type="submit" name="do_login" value="Log in" />

  </p>

  <?php

  echo '</form>';

  $ui->show_footer();

  exit();

}

if ( isset($_GET['stage']) && @$_GET['stage'] == 'pimpmyenano' )

{

  $ui->set_visible_stage($stg_upgrade);

}

else

{

  $ui->set_visible_stage($stg_confirm);

}

// The real migration code

$ui->show_header();

if ( isset($_GET['stage']) && @$_GET['stage'] == 'pimpmyenano' )

{

  /*

   HOW DOES ENANO'S UPGRADER WORK?

   Versions of Enano are organized into branches and then specific versions by

   version number. The upgrader works by using a list of known version numbers

   and then systematically executing upgrade schemas for each version.

   When the user requests an upgrade, the first thing performed is a migration

   check, which verifies that they are within the right branch. If they are not

   within the right branch the upgrade framework will load a migration script

   which will define a function named MIGRATE(). Performing more than one

   migration in one pass will probably never be supported. How that works for

   UX in 1.3.x/1.4.x I know not yet.

   After performing any necessary branch migrations, the framework will perform

   any upgrades within the target branch, which is the first two parts

   (delimited by periods) of the installer's version number defined in the

   installer's common.php.

   enano_perform_upgrade() will only do upgrades. Not migrations. The two as

   illustrated within this installer are very different.

   */

  // Do we need to run the migration first?

  list($major_version, $minor_version) = explode('.', enano_version());

  $current_branch = "$major_version.$minor_version";

  list($major_version, $minor_version) = explode('.', installer_enano_version());

  $target_branch = "$major_version.$minor_version";

  if ( $target_branch != $current_branch )

  {

    // First upgrade to the latest revision of the current branch

    enano_perform_upgrade($current_branch);

    // Branch migration could be tricky and is often highly specific between

    // major branches, so just include a custom migration script.

    require(ENANO_ROOT . "/install/schemas/upgrade/migration/{$current_branch}-{$target_branch}.php");

    $result = MIGRATE();

    if ( !$result )

    {

      echo 'Migration failed, there should be an error message above.';

      $ui->show_footer();

      exit;

    }

  }

  // Do the actual upgrade

  enano_perform_upgrade($target_branch);

  $site_url = makeUrl(getConfig('main_page'), false, true);

  echo '<p>All done! I\'ll actually be nice enough to give you a <a href="' . $site_url . '">link back to your site</a> this release <tt>:)</tt></p>';

}

else

{

  ?>

  <p>Nothing's really implemented for now except the actual migration code, which is not very smart. Just <a href="<?php echo $session->append_sid('upgrade.php?stage=pimpmyenano'); ?>">do the upgrade and get it over with</a>.</p>

  <?php

}

$ui->show_footer();