class.tx_dbal_autoloader.php

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<?php
/***************************************************************
 *  Copyright notice
 *
 *  (c) 2010 Xavier Perseguers <typo3@perseguers.ch>
 *  All rights reserved
 *
 *  This script is part of the TYPO3 project. The TYPO3 project 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.
 *
 *  The GNU General Public License can be found at
 *  http://www.gnu.org/copyleft/gpl.html.
 *  A copy is found in the textfile GPL.txt and important notices to the license
 *  from the author is found in LICENSE.txt distributed with these scripts.
 *
 *
 *  This script 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.
 *
 *  This copyright notice MUST APPEAR in all copies of the script!
 ***************************************************************/

/**
 * Autoloader included from Install Tool that lets DBAL load itself
 * if it makes sense.
 *
 * $Id$
 *
 * @author Xavier Perseguers <typo3@perseguers.ch>
 *
 * @package TYPO3
 * @subpackage dbal
 */
class tx_dbal_autoloader {

    /**
     * Activates DBAL if it is supported.
     *
     * @param tx_install $instObj
     * @return void
     */
    public function execute(tx_install $instObj) {
        if ($instObj->mode == '123') {
            switch ($instObj->step) {
                case 1:
                    if (!t3lib_extMgm::isLoaded('dbal') && $this->isDbalSupported()) {
                        $this->activateDbal();

                        // Reload page to have Install Tool actually load DBAL
                        $redirectUrl = t3lib_div::getIndpEnv('TYPO3_REQUEST_URL');
                        t3lib_utility_Http::redirect($redirectUrl);
                    }
                    break;
                case 2:
                    if (!t3lib_extMgm::isLoaded('dbal') && $this->isDbalSupported()) {
                        $this->activateDbal();
                    }
                    break;
                case 3:
                    $driver = $instObj->INSTALL['localconf.php']['typo_db_driver'];
                    if ($driver === 'mysql') {
                        $this->deactivateDbal();
                    }
                    break;
            }
        }
    }

    /**
     * Returns TRUE if PHP modules to run DBAL are loaded.
     *
     * @return boolean
     */
    protected function isDbalSupported() {
        return extension_loaded('odbc')
                || extension_loaded('pdo')
                || extension_loaded('oci8');
    }

    /**
     * Activates DBAL.
     *
     * @return void
     */
    protected function activateDbal() {
        $extList = t3lib_div::trimExplode(',', $GLOBALS['TYPO3_CONF_VARS']['EXT']['extList']);
        if (!t3lib_div::inArray($extList, 'adodb')) {
            $extList[] = 'adodb';
        }
        if (!t3lib_div::inArray($extList, 'dbal')) {
            $extList[] = 'dbal';
        }
        $this->updateExtensionList(implode(',', $extList));
    }

    /**
     * Dectivates DBAL.
     *
     * @return void
     */
    protected function deactivateDbal() {
        $extList = t3lib_div::trimExplode(',', $GLOBALS['TYPO3_CONF_VARS']['EXT']['extList']);
        $extList = array_flip($extList);

        // Remove sysext dbal and adodb
        if (isset($extList['dbal'])) {
            unset($extList['dbal']);
        }
        if (isset($extList['adodb'])) {
            unset($extList['adodb']);
        }
        $extList = array_flip($extList);

        $this->updateExtensionList(implode(',', $extList));
    }

    /**
     * Updates the list of extensions.
     *
     * @param string $newExtList
     * @return void
     */
    protected function updateExtensionList($newExtList) {
        // Instance of install tool
        $instObj = t3lib_div::makeInstance('t3lib_install');
        $instObj->allowUpdateLocalConf = 1;
        $instObj->updateIdentity = 'TYPO3 Core Update Manager';

        try {
            // Get lines from localconf file
            $lines = $instObj->writeToLocalconf_control();
            $instObj->setValueInLocalconfFile($lines, '$TYPO3_CONF_VARS[\'EXT\'][\'extList\']', $newExtList);
            $result = $instObj->writeToLocalconf_control($lines);
            if ($result === 'nochange') {
                $message = 'DBAL was not loaded.';
                if (!@is_writable(PATH_typo3conf)) {
                    $message .= ' ' . PATH_typo3conf . ' is not writable!';
                }
                throw new Exception($message);
            }

            $GLOBALS['TYPO3_CONF_VARS']['EXT']['extList'] = $newExtList;
            // Make sure to get cache file for backend, not frontend
            $cacheFilePrefix = $GLOBALS['TYPO3_LOADED_EXT']['_CACHEFILE'];
            $GLOBALS['TYPO3_LOADED_EXT']['_CACHEFILE'] = str_replace('temp_CACHED_FE', 'temp_CACHED', $cacheFilePrefix);
            t3lib_extMgm::removeCacheFiles();
        } catch (Exception $e) {
            $header = 'Error';
            $message = $e->getMessage();
            t3lib_timeTrack::debug_typo3PrintError($header, $message, FALSE, t3lib_div::getIndpEnv('TYPO3_SITE_URL'));
            exit;
        }
    }

}


if (defined('TYPO3_MODE') && isset($GLOBALS['TYPO3_CONF_VARS'][TYPO3_MODE]['XCLASS']['ext/dbal/class.tx_dbal_autoloader.php'])) {
    include_once($GLOBALS['TYPO3_CONF_VARS'][TYPO3_MODE]['XCLASS']['ext/dbal/class.tx_dbal_autoloader.php']);
}

// Make instance:
$SOBE = t3lib_div::makeInstance('tx_dbal_autoloader');
$SOBE->execute($this);
?>