config.class.php

一个用PHP编写的

<?php
/* $Id: Config.class.php,v 1.21.2.18.2.3 2006/08/02 21:08:00 lem9 Exp $ */
// vim: expandtab sw=4 ts=4 sts=4:

class PMA_Config
{
    /**
     * @var string  default config source
     */
    var $default_source = './libraries/config.default.php';

    /**
     * @var array   configuration settings
     */
    var $settings = array();

    /**
     * @var string  config source
     */
    var $source = '';

    /**
     * @var int     source modification time
     */
    var $source_mtime = 0;
    var $default_source_mtime = 0;

    /**
     * @var boolean
     */
    var $error_config_file = false;

    /**
     * @var boolean
     */
    var $error_config_default_file = false;

    /**
     * @var boolean
     */
    var $error_pma_uri = false;

    /**
     * @var array
     */
    var $default_server = array();

    /**
     * @var boolean wether init is done or mot
     * set this to false to force some initial checks
     * like checking for required functions
     */
    var $done = false;

    /**
     * constructor
     *
     * @param   string  source to read config from
     */
    function __construct($source = null)
    {
        $this->settings = array();

        // functions need to refresh in case of config file changed goes in
        // PMA_Config::load()
        $this->load($source);

        // other settings, independant from config file, comes in
        $this->checkSystem();

        $this->checkIsHttps();
    }

    /**
     * sets system and application settings
     */
    function checkSystem()
    {
        $this->set('PMA_VERSION', '2.8.2.2-dev');
        /**
         * @deprecated
         */
        $this->set('PMA_THEME_VERSION', 2);
        /**
         * @deprecated
         */
        $this->set('PMA_THEME_GENERATION', 2);

        $this->checkPhpVersion();
        $this->checkWebServerOs();
        $this->checkWebServer();
        $this->checkGd2();
        $this->checkClient();
        $this->checkUpload();
        $this->checkUploadSize();
        $this->checkOutputCompression();
    }

    /**
     * wether to use gzip output compression or not
     */
    function checkOutputCompression()
    {
        // If zlib output compression is set in the php configuration file, no
        // output buffering should be run
        if ( @ini_get('zlib.output_compression') ) {
            $this->set('OBGzip', false);
        }

        // disable output-buffering (if set to 'auto') for IE6, else enable it.
        if ( strtolower($this->get('OBGzip')) == 'auto' ) {
            if ( $this->get('PMA_USR_BROWSER_AGENT') == 'IE'
              && $this->get('PMA_USR_BROWSER_VER') >= 6
              && $this->get('PMA_USR_BROWSER_VER') < 7 ) {
                $this->set('OBGzip', false);
            } else {
                $this->set('OBGzip', true);
            }
        }
    }

    /**
     * Determines platform (OS), browser and version of the user
     * Based on a phpBuilder article:
     * @see http://www.phpbuilder.net/columns/tim20000821.php
     */
    function checkClient()
    {
        if (PMA_getenv('HTTP_USER_AGENT')) {
            $HTTP_USER_AGENT = PMA_getenv('HTTP_USER_AGENT');
        } elseif (!isset($HTTP_USER_AGENT)) {
            $HTTP_USER_AGENT = '';
        }

        // 1. Platform
        if (strstr($HTTP_USER_AGENT, 'Win')) {
            $this->set('PMA_USR_OS', 'Win');
        } elseif (strstr($HTTP_USER_AGENT, 'Mac')) {
            $this->set('PMA_USR_OS', 'Mac');
        } elseif (strstr($HTTP_USER_AGENT, 'Linux')) {
            $this->set('PMA_USR_OS', 'Linux');
        } elseif (strstr($HTTP_USER_AGENT, 'Unix')) {
            $this->set('PMA_USR_OS', 'Unix');
        } elseif (strstr($HTTP_USER_AGENT, 'OS/2')) {
            $this->set('PMA_USR_OS', 'OS/2');
        } else {
            $this->set('PMA_USR_OS', 'Other');
        }

        // 2. browser and version
        // (must check everything else before Mozilla)

        if (preg_match('@Opera(/| )([0-9].[0-9]{1,2})@', $HTTP_USER_AGENT, $log_version)) {
            $this->set('PMA_USR_BROWSER_VER', $log_version[2]);
            $this->set('PMA_USR_BROWSER_AGENT', 'OPERA');
        } elseif (preg_match('@MSIE ([0-9].[0-9]{1,2})@', $HTTP_USER_AGENT, $log_version)) {
            $this->set('PMA_USR_BROWSER_VER', $log_version[1]);
            $this->set('PMA_USR_BROWSER_AGENT', 'IE');
        } elseif (preg_match('@OmniWeb/([0-9].[0-9]{1,2})@', $HTTP_USER_AGENT, $log_version)) {
            $this->set('PMA_USR_BROWSER_VER', $log_version[1]);
            $this->set('PMA_USR_BROWSER_AGENT', 'OMNIWEB');
        //} elseif (ereg('Konqueror/([0-9].[0-9]{1,2})', $HTTP_USER_AGENT, $log_version)) {
        // Konqueror 2.2.2 says Konqueror/2.2.2
        // Konqueror 3.0.3 says Konqueror/3
        } elseif (preg_match('@(Konqueror/)(.*)(;)@', $HTTP_USER_AGENT, $log_version)) {
            $this->set('PMA_USR_BROWSER_VER', $log_version[2]);
            $this->set('PMA_USR_BROWSER_AGENT', 'KONQUEROR');
        } elseif (preg_match('@Mozilla/([0-9].[0-9]{1,2})@', $HTTP_USER_AGENT, $log_version)
                   && preg_match('@Safari/([0-9]*)@', $HTTP_USER_AGENT, $log_version2)) {
            $this->set('PMA_USR_BROWSER_VER', $log_version[1] . '.' . $log_version2[1]);
            $this->set('PMA_USR_BROWSER_AGENT', 'SAFARI');
        } elseif (preg_match('@Mozilla/([0-9].[0-9]{1,2})@', $HTTP_USER_AGENT, $log_version)) {
            $this->set('PMA_USR_BROWSER_VER', $log_version[1]);
            $this->set('PMA_USR_BROWSER_AGENT', 'MOZILLA');
        } else {
            $this->set('PMA_USR_BROWSER_VER', 0);
            $this->set('PMA_USR_BROWSER_AGENT', 'OTHER');
        }
    }

    /**
     * Whether GD2 is present
     */
    function checkGd2()
    {
        if ( $this->get('GD2Available') == 'yes' ) {
            $this->set('PMA_IS_GD2', 1);
        } elseif ( $this->get('GD2Available') == 'no' ) {
            $this->set('PMA_IS_GD2', 0);
        } else {
            if (!@extension_loaded('gd')) {
                PMA_dl('gd');
            }
            if (!@function_exists('imagecreatetruecolor')) {
                $this->set('PMA_IS_GD2', 0);
            } else {
                if (@function_exists('gd_info')) {
                    $gd_nfo = gd_info();
                    if (strstr($gd_nfo["GD Version"], '2.')) {
                        $this->set('PMA_IS_GD2', 1);
                    } else {
                        $this->set('PMA_IS_GD2', 0);
                    }
                } else {
                    /* We must do hard way... */
                    ob_start();
                    phpinfo(INFO_MODULES); /* Only modules */
                    $a = strip_tags(ob_get_contents());
                    ob_end_clean();
                    /* Get GD version string from phpinfo output */
                    if (preg_match('@GD Version[[:space:]]*\(.*\)@', $a, $v)) {
                        if (strstr($v, '2.')) {
                            $this->set('PMA_IS_GD2', 1);
                        } else {
                            $this->set('PMA_IS_GD2', 0);
                        }
                    } else {
                        $this->set('PMA_IS_GD2', 0);
                    }
                }
            }
        }
    }

    /**
     * Whether the Web server php is running on is IIS
     */
    function checkWebServer()
    {
        if (PMA_getenv('SERVER_SOFTWARE')
          // some versions return Microsoft-IIS, some Microsoft/IIS
        // we could use a preg_match() but it's slower
          && stristr(PMA_getenv('SERVER_SOFTWARE'), 'Microsoft')
          && stristr(PMA_getenv('SERVER_SOFTWARE'), 'IIS')) {
            $this->set('PMA_IS_IIS', 1);
        } else {
            $this->set('PMA_IS_IIS', 0);
        }
    }

    /**
     * Whether the os php is running on is windows or not
     */
    function checkWebServerOs()
    {
        // Default to Unix or Equiv
        $this->set('PMA_IS_WINDOWS', 0);
        // If PHP_OS is defined then continue
        if (defined('PHP_OS')) {          
            if (stristr(PHP_OS, 'win') ) {
                // Is it some version of Windows
                $this->set('PMA_IS_WINDOWS', 1);
            } elseif (stristr(PHP_OS, 'OS/2')) {
                // Is it OS/2 (No file permissions like Windows)
                $this->set('PMA_IS_WINDOWS', 1);
            }
        }
    }

    /**
     * detects PHP version
     */
    function checkPhpVersion()
    {
        $match = array();
        if ( ! preg_match('@([0-9]{1,2}).([0-9]{1,2}).([0-9]{1,2})@',
                phpversion(), $match) ) {
            $result = preg_match('@([0-9]{1,2}).([0-9]{1,2})@',
                phpversion(), $match);
        }
        if ( isset( $match ) && ! empty( $match[1] ) ) {
            if ( ! isset( $match[2] ) ) {
                $match[2] = 0;
            }
            if ( ! isset( $match[3] ) ) {
                $match[3] = 0;
            }
            $this->set('PMA_PHP_INT_VERSION',
                (int) sprintf('%d%02d%02d', $match[1], $match[2], $match[3]));
        } else {
            $this->set('PMA_PHP_INT_VERSION', 0);
        }
        $this->set('PMA_PHP_STR_VERSION', phpversion());
    }

    /**
     * re-init object after loadiong from session file
     * checks config file for changes and relaods if neccessary
     */
    function __wakeup()
    {
        if (! $this->checkConfigSource()
          || $this->source_mtime !== filemtime($this->getSource())
          || $this->default_source_mtime !== filemtime($this->default_source)
          || $this->error_config_file
          || $this->error_config_default_file) {
            $this->settings = array();
            $this->load();
            $this->checkSystem();
        }
        // check for https needs to be done everytime,
        // as https and http uses same session so this info can not be stored
        // in session
        $this->checkIsHttps();

        $this->checkCollationConnection();
    }

    /**
     * loads default values from default source
     *
     * @uses    file_exists()
     * @uses    $this->default_source
     * @uses    $this->error_config_default_file
     * @uses    $this->settings
     * @return  boolean     success
     */
    function loadDefaults()
    {
        $cfg = array();
        if ( ! file_exists($this->default_source) ) {
            $this->error_config_default_file = true;
            return false;
        }
        include $this->default_source;

        $this->default_source_mtime = filemtime($this->default_source);

        $this->default_server = $cfg['Servers'][1];
        unset( $cfg['Servers'] );

        $this->settings = PMA_array_merge_recursive($this->settings, $cfg);

        $this->error_config_default_file = false;

        return true;
    }

    /**
     * loads configuration from $source, usally the config file
     * should be called on object creation and from __wakeup if config file
     * has changed
     *
     * @param   string $source  config file
     */
    function load($source = null)
    {
        $this->loadDefaults();

        if ( null !== $source ) {
            $this->setSource($source);
        }

        if ( ! $this->checkConfigSource() ) {
            return false;
        }

        $cfg = array();

        /**
         * Parses the configuration file
         */
        $old_error_reporting = error_reporting(0);
        if ( function_exists('file_get_contents') ) {
            $eval_result =
                eval( '?>' . file_get_contents($this->getSource()) );
        } else {
            $eval_result =
                eval( '?>' . implode("\n", file($this->getSource())) );
        }
        error_reporting($old_error_reporting);

        if ( $eval_result === false ) {
            $this->error_config_file = true;
        } else  {
            $this->error_config_file = false;
            $this->source_mtime = filemtime($this->getSource());
        }

        /**
         * @TODO check validity of $_COOKIE['pma_collation_connection']
         */
        if ( ! empty( $_COOKIE['pma_collation_connection'] ) ) {
            $this->set('collation_connection',
                strip_tags($_COOKIE['pma_collation_connection']) );
        } else {
            $this->set('collation_connection',
                $this->get('DefaultConnectionCollation') );
        }

        $this->checkCollationConnection();
        //$this->checkPmaAbsoluteUri();
        $this->settings = PMA_array_merge_recursive($this->settings, $cfg);
        return true;
    }

    /**
     * set source
     * @param   string  $source
     */
    function setSource($source)
    {
        $this->source = trim($source);
    }

    /**
     * checks if the config folder still exists and terminates app if true
     */
    function checkConfigFolder()
    {
        // Refuse to work while there still might be some world writable dir: