configuration.php

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<?php
function elgg_get_site_url($site_guid = 0) {
    if ($site_guid == 0) {
        global $CONFIG;
        return $CONFIG->wwwroot;
    }
 
    $site = get_entity($site_guid);
 
    if (!$site instanceof ElggSite) {
        return false;
    }
    /* @var ElggSite $site */
 
    return $site->url;
}
 
function elgg_get_plugins_path() {
    global $CONFIG;
    return $CONFIG->pluginspath;
}
 
function elgg_get_data_path() {
    global $CONFIG;
    return $CONFIG->dataroot;
}
 
function elgg_get_root_path() {
    global $CONFIG;
    return $CONFIG->path;
}
 
function elgg_get_config($name, $site_guid = 0) {
    global $CONFIG;
 
    $name = trim($name);
 
    // do not return $CONFIG value if asking for non-current site
    if (($site_guid === 0 || $site_guid === null || $site_guid == $CONFIG->site_guid) && isset($CONFIG->$name)) {
        return $CONFIG->$name;
    }
 
    if ($site_guid === null) {
        // installation wide setting
        $value = datalist_get($name);
    } else {
        if ($site_guid == 0) {
            $site_guid = (int) $CONFIG->site_guid;
        }
 
        // hit DB only if we're not sure if value isn't already loaded
        if (!isset($CONFIG->site_config_loaded) || $site_guid != $CONFIG->site_guid) {
            // site specific setting
            $value = get_config($name, $site_guid);
        } else {
            $value = null;
        }
    }
 
    // @todo document why we don't cache false
    if ($value === false) {
        return null;
    }
 
    if ($site_guid == $CONFIG->site_guid || $site_guid === null) {
        $CONFIG->$name = $value;
    }
 
    return $value;
}
 
function elgg_set_config($name, $value) {
    global $CONFIG;
 
    $name = trim($name);
 
    $CONFIG->$name = $value;
}
 
function elgg_save_config($name, $value, $site_guid = 0) {
    global $CONFIG;
 
    $name = trim($name);
 
    if (strlen($name) > 255) {
        elgg_log("The name length for configuration variables cannot be greater than 255", "ERROR");
        return false;
    }
 
    if ($site_guid === null) {
        if (is_array($value) || is_object($value)) {
            return false;
        }
        $result = datalist_set($name, $value);
    } else {
        if ($site_guid == 0) {
            $site_guid = (int) $CONFIG->site_guid;
        }
        $result = set_config($name, $value, $site_guid);
    }
 
    if ($site_guid === null || $site_guid == $CONFIG->site_guid) {
        elgg_set_config($name, $value);
    }
 
    return $result;
}
 
global $DATALIST_CACHE;
$DATALIST_CACHE = array();
 
function datalist_get($name) {
    global $CONFIG, $DATALIST_CACHE;
 
    $name = trim($name);
 
    // cannot store anything longer than 255 characters in db, so catch here
    if (elgg_strlen($name) > 255) {
        elgg_log("The name length for configuration variables cannot be greater than 255", "ERROR");
        return false;
    }
 
    if (isset($DATALIST_CACHE[$name])) {
        return $DATALIST_CACHE[$name];
    }
 
    // If memcache enabled then cache value in memcache
    $value = null;
    static $datalist_memcache = null;
    if (!$datalist_memcache && is_memcache_available()) {
        $datalist_memcache = new ElggMemcache('datalist_memcache');
    }
    if ($datalist_memcache) {
        $value = $datalist_memcache->load($name);
    }
    // @todo cannot cache 0 or false?
    if ($value) {
        return $value;
    }
 
    // not in cache and not in memcache so check database
    $escaped_name = sanitize_string($name);
    $result = get_data_row("SELECT * FROM {$CONFIG->dbprefix}datalists WHERE name = '$escaped_name'");
    if ($result) {
        $DATALIST_CACHE[$result->name] = $result->value;
 
        // Cache it if memcache is available
        if ($datalist_memcache) {
            $datalist_memcache->save($result->name, $result->value);
        }
 
        return $result->value;
    }
 
    return null;
}
 
function datalist_set($name, $value) {
    global $CONFIG, $DATALIST_CACHE;
 
    $name = trim($name);
 
    // cannot store anything longer than 255 characters in db, so catch before we set
    if (elgg_strlen($name) > 255) {
        elgg_log("The name length for configuration variables cannot be greater than 255", "ERROR");
        return false;
    }
 
    // If memcache is available then invalidate the cached copy
    static $datalist_memcache = null;
    if ((!$datalist_memcache) && (is_memcache_available())) {
        $datalist_memcache = new ElggMemcache('datalist_memcache');
    }
 
    if ($datalist_memcache) {
        $datalist_memcache->delete($name);
    }
 
    $escaped_name = sanitize_string($name);
    $escaped_value = sanitize_string($value);
    $success = insert_data("INSERT INTO {$CONFIG->dbprefix}datalists"
        . " SET name = '$escaped_name', value = '$escaped_value'"
        . " ON DUPLICATE KEY UPDATE value = '$escaped_value'");
 
    if ($success !== false) {
        $DATALIST_CACHE[$name] = $value;
        return true;
    } else {
        return false;
    }
}
 
function run_function_once($functionname, $timelastupdatedcheck = 0) {
    $lastupdated = datalist_get($functionname);
    if ($lastupdated) {
        $lastupdated = (int) $lastupdated;
    } elseif ($lastupdated !== false) {
        $lastupdated = 0;
    } else {
        // unable to check datalist
        return false;
    }
    if (is_callable($functionname) && $lastupdated <= $timelastupdatedcheck) {
        $functionname();
        datalist_set($functionname, time());
        return true;
    } else {
        return false;
    }
}
 
function unset_config($name, $site_guid = 0) {
    global $CONFIG;
 
    $name = trim($name);
 
    $site_guid = (int) $site_guid;
    if ($site_guid == 0) {
        $site_guid = (int) $CONFIG->site_guid;
    }
 
    if ($site_guid == $CONFIG->site_guid && isset($CONFIG->$name)) {
        unset($CONFIG->$name);
    }
 
    $escaped_name = sanitize_string($name);
    $query = "DELETE FROM {$CONFIG->dbprefix}config WHERE name = '$escaped_name' AND site_guid = $site_guid";
 
    return delete_data($query) !== false;
}
 
function set_config($name, $value, $site_guid = 0) {
    global $CONFIG;
 
    $name = trim($name);
 
    // cannot store anything longer than 255 characters in db, so catch before we set
    if (elgg_strlen($name) > 255) {
        elgg_log("The name length for configuration variables cannot be greater than 255", "ERROR");
        return false;
    }
 
    $site_guid = (int) $site_guid;
    if ($site_guid == 0) {
        $site_guid = (int) $CONFIG->site_guid;
    }
 
    if ($site_guid == $CONFIG->site_guid) {
        $CONFIG->$name = $value;
    }
 
    $escaped_name = sanitize_string($name);
    $escaped_value = sanitize_string(serialize($value));
    $result = insert_data("INSERT INTO {$CONFIG->dbprefix}config
        SET name = '$escaped_name', value = '$escaped_value', site_guid = $site_guid
        ON DUPLICATE KEY UPDATE value = '$escaped_value'");
 
    return $result !== false;
}
 
function get_config($name, $site_guid = 0) {
    global $CONFIG;
 
    $name = trim($name);
 
    $site_guid = (int) $site_guid;
 
    // check for deprecated values.
    // @todo might be a better spot to define this?
    $new_name = false;
    switch($name) {
        case 'viewpath':
            $new_name = 'view_path';
            break;
 
        case 'pluginspath':
            $new_name = 'plugins_path';
            break;
 
        case 'sitename':
            $new_name = 'site_name';
            break;
    }
 
    // @todo these haven't really been implemented in Elgg 1.8. Complete in 1.9.
    // show dep message
    if ($new_name) {
        //  $msg = "Config value $name has been renamed as $new_name";
        $name = $new_name;
        //  elgg_deprecated_notice($msg, $dep_version);
    }
 
    if ($site_guid == 0) {
        $site_guid = (int) $CONFIG->site_guid;
    }
 
    // decide from where to return the value
    if ($site_guid == $CONFIG->site_guid && isset($CONFIG->$name)) {
        return $CONFIG->$name;
    }
 
    $escaped_name = sanitize_string($name);
    $result = get_data_row("SELECT value FROM {$CONFIG->dbprefix}config
        WHERE name = '$escaped_name' AND site_guid = $site_guid");
 
    if ($result) {
        $result = unserialize($result->value);
 
        if ($site_guid == $CONFIG->site_guid) {
            $CONFIG->$name = $result;
        }
 
        return $result;
    }
 
    return null;
}
 
function _elgg_get_all_config($site_guid = 0) {
    global $CONFIG;
 
    $site_guid = (int) $site_guid;
 
    if ($site_guid == 0) {
        $site_guid = (int) $CONFIG->site_guid;
    }
 
    if ($result = get_data("SELECT * FROM {$CONFIG->dbprefix}config WHERE site_guid = $site_guid")) {
        foreach ($result as $r) {
            $name = $r->name;
            $value = $r->value;
            $CONFIG->$name = unserialize($value);
        }
 
        return true;
    }
    return false;
}
 
function _elgg_load_site_config() {
    global $CONFIG;
 
    $CONFIG->site_guid = (int) datalist_get('default_site');
    $CONFIG->site_id = $CONFIG->site_guid;
    $CONFIG->site = get_entity($CONFIG->site_guid);
    if (!$CONFIG->site) {
        throw new InstallationException("Unable to handle this request. This site is not configured or the database is down.");
    }
 
    $CONFIG->wwwroot = $CONFIG->site->url;
    $CONFIG->sitename = $CONFIG->site->name;
    $CONFIG->sitedescription = $CONFIG->site->description;
    $CONFIG->siteemail = $CONFIG->site->email;
    $CONFIG->url = $CONFIG->wwwroot;
 
    _elgg_get_all_config();
    // gives hint to elgg_get_config function how to approach missing values
    $CONFIG->site_config_loaded = true;
 
    if (!empty($CONFIG->debug)) {
        _elgg_services()->logger->setLevel($CONFIG->debug);
        _elgg_services()->logger->setDisplay(true);
    }
}
 
function _elgg_load_application_config() {
    global $CONFIG, $DATALIST_CACHE;
 
    $install_root = str_replace("\\", "/", dirname(dirname(dirname(__FILE__))));
    $defaults = array(
        'path' => "$install_root/",
        'view_path' => "$install_root/views/",
        'plugins_path' => "$install_root/mod/",
        'language' => 'en',
 
        // compatibility with old names for plugins not using elgg_get_config()
        'viewpath' => "$install_root/views/",
        'pluginspath' => "$install_root/mod/",
    );
 
    foreach ($defaults as $name => $value) {
        if (empty($CONFIG->$name)) {
            $CONFIG->$name = $value;
        }
    }
 
    // set cookie values for session and remember me
    if (!isset($CONFIG->cookies)) {
        $CONFIG->cookies = array();
    }
    if (!isset($CONFIG->cookies['session'])) {
        $CONFIG->cookies['session'] = array();
    }
    $session_defaults = session_get_cookie_params();
    $session_defaults['name'] = 'Elgg';
    $CONFIG->cookies['session'] = array_merge($session_defaults, $CONFIG->cookies['session']);
    if (!isset($CONFIG->cookies['remember_me'])) {
        $CONFIG->cookies['remember_me'] = array();
    }
    $session_defaults['name'] = 'elggperm';
    $session_defaults['expire'] = strtotime("+30 days");
    $CONFIG->cookies['remember_me'] = array_merge($session_defaults, $CONFIG->cookies['remember_me']);
 
    // load entire datalist
    // This can cause OOM problems when the datalists table is large
    // @todo make a list of datalists that we want to get in one grab
    if (!is_memcache_available()) {
        $result = get_data("SELECT * FROM {$CONFIG->dbprefix}datalists");
        if ($result) {
            foreach ($result as $row) {
                $DATALIST_CACHE[$row->name] = $row->value;
            }
        }
    }
 
    $path = datalist_get('path');
    if (!empty($path)) {
        $CONFIG->path = $path;
    }
 
    // allow sites to set dataroot and simplecache_enabled in settings.php
    if (isset($CONFIG->dataroot)) {
        $CONFIG->dataroot = sanitise_filepath($CONFIG->dataroot);
        $CONFIG->dataroot_in_settings = true;
    } else {
        $dataroot = datalist_get('dataroot');
        if (!empty($dataroot)) {
            $CONFIG->dataroot = $dataroot;
        }
        $CONFIG->dataroot_in_settings = false;
    }
    if (isset($CONFIG->simplecache_enabled)) {
        $CONFIG->simplecache_enabled_in_settings = true;
    } else {
        $simplecache_enabled = datalist_get('simplecache_enabled');
        if ($simplecache_enabled !== false) {
            $CONFIG->simplecache_enabled = $simplecache_enabled;
        } else {
            $CONFIG->simplecache_enabled = 1;
        }
        $CONFIG->simplecache_enabled_in_settings = false;
    }
 
    $system_cache_enabled = datalist_get('system_cache_enabled');
    if ($system_cache_enabled !== false) {
        $CONFIG->system_cache_enabled = $system_cache_enabled;
    } else {
        $CONFIG->system_cache_enabled = 1;
    }
 
    // initialize context here so it is set before the first get_input call
    $CONFIG->context = array();
 
    // needs to be set before system, init for links in html head
    $CONFIG->lastcache = (int)datalist_get("simplecache_lastupdate");
 
    $CONFIG->i18n_loaded_from_cache = false;
 
    // this must be synced with the enum for the entities table
    $CONFIG->entity_types = array('group', 'object', 'site', 'user');
}
 
function _elgg_config_test($hook, $type, $tests) {
    global $CONFIG;
    $tests[] = "{$CONFIG->path}engine/tests/ElggCoreConfigTest.php";
    return $tests;
}
 
elgg_register_plugin_hook_handler('unit_test', 'system', '_elgg_config_test');