mahara.php 19.8 KB
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<?php
/**
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 * This program is part of mahara
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 *
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 *  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.
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 *
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 *  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
 *
 * @package    mahara
 * @subpackage core
 * @author     Penny Leach <penny@catalyst.net.nz>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL
 * @copyright  (C) 2006,2007 Catalyst IT Ltd http://catalyst.net.nz
 * @copyright  (C) portions from Moodle, (C) Martin Dougiamas http://dougiamas.com
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 */

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defined('INTERNAL') || die();
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/**
 * This function checks core and plugins
 * for which need to be upgraded/installed
 * @returns array of objects
 */
function check_upgrades() {

    $toupgrade = array();

    // check core first...
    if (!$coreversion = get_config('version')) {
        $core = new StdClass;
        $core->install = true;
        $toupgrade['core'] = $core;
        // just return here, there's no point doing anything else right now...
        return $toupgrade;
    } 
    else {
        require('version.php');
        if ($config->version > $coreversion) {
            $core = new StdClass;
            $core->upgrade = true;
            $core->from = $coreversion;
            if ($corerelease = get_config('release')) {
                $core->fromrelease = $corerelease;
            }
            $core->to = $config->version;
            $core->torelease = $config->release;
            $toupgrade['core'] = $core;
        }
    }

    // artefact plugins next..
    $dirhandle = opendir(get_config('docroot').'artefacts/');
    while (false !== ($dir = readdir($dirhandle))) {
        if (!$pluginversion = get_config_plugin('arfetact',$dir,'version')) {
            $plugin = new StdClass;
            $plugin->install = true;
            $toupgrade['artefact'][$dir] = $plugin;
        } 
        else {
            require(get_config('docroot').'artefacts/'.$dir.'/version.php');
            if ($config->version > $pluginversion) {
                $plugin = new StdClass;
                $plugin->upgrade = true;
                $plugin->from = $pluginversion;
                if ($pluginrelease = get_config_plugin('artefact',$dir,'release')) {
                    $plugin->fromrelease = $pluginrelease;
                }
                $plugin->to = $config->version;
                if (!empty($config->release)) {
                    $plugin->torelease = $config->release;
                }
            }
        }
    }

    return $toupgrade;
}

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/** 
 * work around silly php settings
 * and broken setup stuff about the install
 * and raise a warning/fail depending on severity
 */
function ensure_sanity() {

    // register globals workaround
    if (ini_get_bool('register_globals')) {
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        log_environ(get_string('registerglobals', 'error'));
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        $massivearray = array_keys(array_merge($_POST,$_GET,$_COOKIE,$_SERVER,$_REQUEST,$_FILES));
        foreach ($massivearray as $tounset) {
            unset($GLOBALS[$tounset]);
        }
    }

    // magic_quotes_gpc workaround
    if (ini_get_bool('magic_quotes_gpc')) {
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        log_environ(get_string('magicquotesgpc', 'error'));
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        function stripslashes_deep($value) {
            $value = is_array($value) ?
                array_map('stripslashes_deep', $value) :
                stripslashes($value);
            return $value;
        }
        $_POST = array_map('stripslashes_deep', $_POST);
        $_GET = array_map('stripslashes_deep', $_GET);
        $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
        $_REQUEST = array_map('stripslashes_deep', $_REQUEST);

        $servervars = array('REQUEST_URI','QUERY_STRING','HTTP_REFERER','PATH_INFO','PHP_SELF','PATH_TRANSLATED');
        foreach ($servervars as $tocheck) {
            if (array_key_exists($tocheck,$_SERVER) && !empty($_SERVER[$tocheck])) {
                $_SERVER[$tocheck] = stripslashes($_SERVER[$tocheck]);
            }
        }
    }

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    if (ini_get_bool('magic_quotes_runtime')) {
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        // Turn of magic_quotes_runtime. Anyone with this on deserves a slap in the face
        set_magic_quotes_runtime(0);
        log_environ(get_string('magicquotesruntime', 'error'));
    }

    if (ini_get_bool('magic_quotes_sybase')) {
        // See above comment re. magic_quotes_runtime
        @ini_set('magic_quotes_sybase', 0);
        log_environ(get_string('magicquotessybase', 'error'));
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    }

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    if (ini_get_bool('safe_mode')) {
        // We don't run with safe mode
        throw new ConfigSanityException(get_string('safemodeon', 'error'));
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    }

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    // Other things that might be worth checking:
    //    memory limit
    //    file_uploads (off|on)
    //    upload_max_filesize
    //    allow_url_fopen (only if we use this)
    //

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    // dataroot inside document root.
    if (strpos(get_config('dataroot'),get_config('docroot')) !== false) {
        trigger_error(get_string('datarootinsidedocroot','error'));
    }

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    // dataroot not writable..
    if (!check_dir_exists(get_config('dataroot')) || !is_writable(get_config('dataroot'))) {
        trigger_error(get_string('datarootnotwritable','error',get_config('dataroot')));
    }
    
    check_dir_exists(get_config('dataroot').'smarty/compile');
    check_dir_exists(get_config('dataroot').'smarty/cache');

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}

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function get_string($identifier,$section) {

    $langconfigstrs = array('parentlanguage', 'strftimedate', 'strftimedateshort', 'strftimedatetime',
                            'strftimedaydate', 'strftimedaydatetime', 'strftimedayshort', 'strftimedaytime',
                            'strftimemonthyear', 'strftimerecent', 'strftimerecentfull', 'strftimetime',
                            'thislanguage');

    if (in_array($identifier, $langconfigstrs)) {
        $section = 'langconfig';  
    }

    $variables = func_get_args();
    if (count($variables) > 2) { // we have some stuff we need to sprintf
        array_shift($variables);
        array_shift($variables); //shift off the first two.
    } else {
        $variables = array();
    }
    
    $lang = current_language();

    if ($section == '') {
        $section = 'mahara';
    }

    // Define the locations of language strings for this section
    $docroot = get_config('docroot');
    $locations = array();
    
    if ($section == 'mahara' || $section != 'langconfig') {
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        $locations[] = $docroot.'lang/';
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    } else {
        $extras = array('artefacts','auth'); // more later..
        foreach ($extras as $tocheck) {
            if (strpos($section,$tocheck.'.') === 0) {
                $pluginname = substr($section,strlen($tocheck));
                $locations[] = $docroot.$tocheck.'/'.$pluginname.'/lang/';
            }
        }
    }
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    // First check all the normal locations for the string in the current language
    foreach ($locations as $location) {
        //if local directory not found, or particular string does not exist in local direcotry
        $langfile = $location.$lang.'/'.$section.'.php';
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        if (is_readable($langfile)) {
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            if ($result = get_string_from_file($identifier, $langfile)) {
                return format_langstring($result,$variables);
            }
        }
    }

    // If the preferred language was English (utf8) we can abort now
    // saving some checks beacuse it's the only "root" lang
    if ($lang == 'en.utf8') {
        return '[['. $identifier .']]';
    }

    // Is a parent language defined?  If so, try to find this string in a parent language file

    foreach ($locations as $location) {
        $langfile = $location.$lang.'/langconfig.php';
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        if (is_readable($langfile)) {
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            if ($parentlang = get_string_from_file('parentlanguage', $langfile)) {
                $langfile = $location.$parentlang.'/'.$section.'.php';
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                if (is_readable($langfile)) {
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                    if ($result = get_string_from_file($identifier, $langfile)) {
                        return format_langstring($result,$variables);
                    }
                }
            }
        }
    }

    /// Our only remaining option is to try English
    foreach ($locations as $location) {
        //if local_en not found, or string not found in local_en
        $langfile = $location.'en.utf8/'.$module.'.php';
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        if (is_readable($langfile)) {
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            if ($result = get_string_from_file($identifier, $langfile)) {
                return format_langstring($result,$variables);
            }
        }
    }

    return '[['.$identifier.']]';  // Last resort
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}
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/**
 * This function is only used from {@link get_string()}.
 *
 * @internal Only used from get_string, not meant to be public API
 * @param string $identifier ?
 * @param string $langfile ?
 * @param string $destination ?
 * @return string|false ?
 * @staticvar array $strings Localized strings
 * @access private
 * @todo Finish documenting this function.
 */
function get_string_from_file($identifier, $langfile) {

    static $strings;    // Keep the strings cached in memory.

    if (empty($strings[$langfile])) {
        $string = array();
        include ($langfile);
        $strings[$langfile] = $string;
    } else {
        $string = &$strings[$langfile];
    }

    if (!isset ($string[$identifier])) {
        return false;
    }

    return $string[$identifier];
}

/**
 * This function makes the return value of ini_get consistent if you are
 * setting server directives through the .htaccess file in apache.
 * Current behavior for value set from php.ini On = 1, Off = [blank]
 * Current behavior for value set from .htaccess On = On, Off = Off
 * Contributed by jdell @ unr.edu
 *
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 * @param string $ini_get_arg setting to look for
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 * @return bool
 */
function ini_get_bool($ini_get_arg) {
    $temp = ini_get($ini_get_arg);

    if ($temp == '1' or strtolower($temp) == 'on') {
        return true;
    }
    return false;
}

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/**
 * This function loads up the basic $CFG
 * from the database table
 * note that it doesn't load plugin config
 * as not every page needs them
 * @return boolean false if the assignment fails (generally if the databse is not installed)
 */
function load_config() {
    global $CFG;
    
    try {
        $dbconfig = get_records('config');
    } 
    catch (ADODB_Exception $e) {
        return false;
    }
    
    foreach ($dbconfig as $cfg) {
        if (isset($CFG->{$cfg->field}) && $CFG->{$cfg->field} != $CFG->value) {
            // @todo warn that we're overriding db config with $CFG
            continue;
        }
        $CFG->{$cfg->field} = $cfg->value;
    }

    return true;
}

/**
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 * This function returns a value from $CFG
 * or null if it is not found
 * 
 * @param string $key config setting to look for 
 * @return mixed
 */
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function get_config($key) {
    global $CFG;
    if (array_key_exists($key,$CFG)) {
        return $CFG->$key;
    }
    return null;
}

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/**
 * This function sets a config variable
 * both in $CFG and in the database
 *
 * @param string $key config field to set
 * @param string $value config value
 */
function set_config($key, $value) {
    if (set_field('config',$key,$value,'field',$key)) {
        $CFG->{$key} = $value;
        return true;
    }
    return false;
}

/**
 * This function returns a value for $CFG for a plugin
 * or null if it is not found
 * note that it may go and look in the database
 *
 * @param string $plugintype eg artefact
 * @param string $pluginname eg blog
 * @param string $key the config setting to look for
 */
function get_config_plugin($plugintype, $pluginname, $key) {
    global $CFG;
    
    if (array_key_exists('plugin',$CFG)
        && array_key_exists($plugintype,$CFG->plugin)
        && array_key_exists($pluginname,$CFG->plugin->{$plugintype})
        && array_key_exists($key,$CFG->plugin->{$plugintype}->{$pluginname})) {
        return  $CFG->plugin->{$plugintype}->{$pluginname}->{$key};
    }
    
    if (!$value = get_field('config_'.$plugintype,'value','plugin',$pluginname,'field',$key)) {
        $value = null;
    } 
    
    $CFG->plugin->{$plugintype}->{$pluginname}->{$key} = $value;
    return $value;
}

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/**
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 * This function prints an array or object
 * wrapped inside <pre></pre>
 * 
 * @param $mixed value to print
 */
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function print_object($mixed) {
    echo '<pre>';
    print_r($mixed);
    echo '</pre>';
}

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/**
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 * This function returns the current 
 * language to use, either for a given user
 * or sitewide, or the default
 * 
 * @return string
 */
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function current_language() {
    global $USER, $CFG;
    if (!empty($USER->lang)) {
        return $USER->lang;
    }
    if (!empty($CFG->lang)) {
        return $CFG->lang;
    }
    return 'en.utf8';
}

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/**
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 * Helper function to sprintf language strings
 * with a variable number of arguments
 * 
 * @param string $string raw string to use
 * @param array $args arguments to sprintf
 */
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function format_langstring($string,$args) {
    return call_user_func_array('sprintf',array_merge(array($string),$args));
}

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/**
 * Helper function to figure out whether an array is an array or a hash
 * @param array $array array to check
 * @return bool true if the array is a hash
 */
function is_hash($array) {
    if (!is_array($array)) {
        return false;
    }
    $diff = array_diff_assoc($array,array_values($array));
    return !empty($diff);
}

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/**
 * clean the variables and/or cast to specific types, based on
 * an options field.
 *
 * @uses PARAM_INT
 * @uses PARAM_INTEGER
 * @uses PARAM_ALPHA
 * @uses PARAM_ALPHANUM
 * @uses PARAM_NOTAGS
 * @uses PARAM_ALPHAEXT
 * @uses PARAM_BOOL
 * @uses PARAM_SAFEDIR
 * @uses PARAM_CLEANFILE
 * @uses PARAM_FILE
 * @uses PARAM_PATH
 * @uses PARAM_HOST
 * @uses PARAM_URL
 * @uses PARAM_LOCALURL
 * @uses PARAM_CLEANHTML
 * @uses PARAM_SEQUENCE
 * @param mixed $param the variable we are cleaning
 * @param int $type expected format of param after cleaning.
 * @return mixed
 */
function clean_param($key, $type, $from=REQUEST_EITHER) {

    if (is_array($param)) {              // Let's loop
        $newparam = array();
        foreach ($param as $key => $value) {
            $newparam[$key] = clean_param($value, $type);
        }
        return $newparam;
    }

    switch ($type) {
        case PARAM_CLEANHTML:    // prepare html fragment for display, do not store it into db!!
            $param = stripslashes($param);   // Remove any slashes
            $param = clean_text($param);     // Sweep for scripts, etc
            return trim($param);

        case PARAM_INT:
            return (int)$param;  // Convert to integer

        case PARAM_ALPHA:        // Remove everything not a-z
            return eregi_replace('[^a-zA-Z]', '', $param);

        case PARAM_ALPHANUM:     // Remove everything not a-zA-Z0-9
            return eregi_replace('[^A-Za-z0-9]', '', $param);

        case PARAM_ALPHAEXT:     // Remove everything not a-zA-Z/_-
            return eregi_replace('[^a-zA-Z/_-]', '', $param);

        case PARAM_SEQUENCE:     // Remove everything not 0-9,
            return eregi_replace('[^0-9,]', '', $param);

        case PARAM_BOOL:         // Convert to 1 or 0
            $tempstr = strtolower($param);
            if ($tempstr == 'on' or $tempstr == 'yes' ) {
                $param = 1;
            } else if ($tempstr == 'off' or $tempstr == 'no') {
                $param = 0;
            } else {
                $param = empty($param) ? 0 : 1;
            }
            return $param;

        case PARAM_NOTAGS:       // Strip all tags
            return strip_tags($param);

        case PARAM_MULTILANG:    // leave only tags needed for multilang
            return clean_param(strip_tags($param, '<lang><span>'), PARAM_CLEAN);

        case PARAM_SAFEDIR:      // Remove everything not a-zA-Z0-9_-
            return eregi_replace('[^a-zA-Z0-9_-]', '', $param);

        case PARAM_CLEANFILE:    // allow only safe characters
            return clean_filename($param);

        case PARAM_FILE:         // Strip all suspicious characters from filename
            $param = ereg_replace('[[:cntrl:]]|[<>"`\|\':\\/]', '', $param);
            $param = ereg_replace('\.\.+', '', $param);
            if($param == '.') {
                $param = '';
            }
            return $param;

        case PARAM_PATH:         // Strip all suspicious characters from file path
            $param = str_replace('\\\'', '\'', $param);
            $param = str_replace('\\"', '"', $param);
            $param = str_replace('\\', '/', $param);
            $param = ereg_replace('[[:cntrl:]]|[<>"`\|\':]', '', $param);
            $param = ereg_replace('\.\.+', '', $param);
            $param = ereg_replace('//+', '/', $param);
            return ereg_replace('/(\./)+', '/', $param);

        case PARAM_HOST:         // allow FQDN or IPv4 dotted quad
            preg_replace('/[^\.\d\w-]/','', $param ); // only allowed chars
            // match ipv4 dotted quad
            if (preg_match('/(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/',$param, $match)){
                // confirm values are ok
                if ( $match[0] > 255
                     || $match[1] > 255
                     || $match[3] > 255
                     || $match[4] > 255 ) {
                    // hmmm, what kind of dotted quad is this?
                    $param = '';
                }
            } elseif ( preg_match('/^[\w\d\.-]+$/', $param) // dots, hyphens, numbers
                       && !preg_match('/^[\.-]/',  $param) // no leading dots/hyphens
                       && !preg_match('/[\.-]$/',  $param) // no trailing dots/hyphens
                       ) {
                // all is ok - $param is respected
            } else {
                // all is not ok...
                $param='';
            }
            return $param;

        case PARAM_URL:          // allow safe ftp, http, mailto urls
            include_once(get_config('libroot').'validateurlsyntax.php');
            if (!empty($param) && validateUrlSyntax($param, 's?H?S?F?E?u-P-a?I?p-f?q?r?')) {
                // all is ok, param is respected
            } else {
                $param =''; // not really ok
            }
            return $param;

        case PARAM_LOCALURL:     // allow http absolute, root relative and relative URLs within wwwroot
            clean_param($param, PARAM_URL);
            if (!empty($param)) {
                if (preg_match(':^/:', $param)) {
                    // root-relative, ok!
                } elseif (preg_match('/^'.preg_quote(get_config('wwwroot')).'/i',$param)) {
                    // absolute, and matches our wwwroot
                } else {
                    // relative - let's make sure there are no tricks
                    if (validateUrlSyntax($param, 's-u-P-a-p-f+q?r?')) {
                        // looks ok.
                    } else {
                        $param = '';
                    }
                }
            }
            return $param;

        default:                 // throw error, switched parameters in optional_param or another serious problem
            // @todo nigel hissy fit
            error("Unknown parameter type: $type");
    }
}

/**
 * Function to check if a directory exists and optionally create it.
 *
 * @param string absolute directory path
 * @param boolean create directory if does not exist
 * @param boolean create directory recursively
 *
 * @return boolean true if directory exists or created
 */
function check_dir_exists($dir, $create=true, $recursive=true) {

    $status = true;

    if(!is_dir($dir)) {
        if (!$create) {
            $status = false;
        } else {
            umask(0000); 
            $status = mkdir($dir, 0777, true);
        }
    }
    return $status;
}

622
?>