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Diffstat (limited to 'lib/statusnet.php')
| -rw-r--r-- | lib/statusnet.php | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/lib/statusnet.php b/lib/statusnet.php new file mode 100644 index 000000000..0c5807d7b --- /dev/null +++ b/lib/statusnet.php @@ -0,0 +1,295 @@ +<?php +/* + * StatusNet - the distributed open-source microblogging tool + * Copyright (C) 2009, StatusNet, Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation, either version 3 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 Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); } + +global $config, $_server, $_path; + +/** + * Global configuration setup and management. + */ +class StatusNet +{ + protected static $have_config; + + /** + * Configure and instantiate a plugin into the current configuration. + * Class definitions will be loaded from standard paths if necessary. + * Note that initialization events won't be fired until later. + * + * @param string $name class name & plugin file/subdir name + * @param array $attrs key/value pairs of public attributes to set on plugin instance + * + * @throws ServerException if plugin can't be found + */ + public static function addPlugin($name, $attrs = null) + { + $name = ucfirst($name); + $pluginclass = "{$name}Plugin"; + + if (!class_exists($pluginclass)) { + + $files = array("local/plugins/{$pluginclass}.php", + "local/plugins/{$name}/{$pluginclass}.php", + "local/{$pluginclass}.php", + "local/{$name}/{$pluginclass}.php", + "plugins/{$pluginclass}.php", + "plugins/{$name}/{$pluginclass}.php"); + + foreach ($files as $file) { + $fullpath = INSTALLDIR.'/'.$file; + if (@file_exists($fullpath)) { + include_once($fullpath); + break; + } + } + if (!class_exists($pluginclass)) { + throw new ServerException(500, "Plugin $name not found."); + } + } + + $inst = new $pluginclass(); + if (!empty($attrs)) { + foreach ($attrs as $aname => $avalue) { + $inst->$aname = $avalue; + } + } + return true; + } + + /** + * Initialize, or re-initialize, StatusNet global configuration + * and plugins. + * + * If switching site configurations during script execution, be + * careful when working with leftover objects -- global settings + * affect many things and they may not behave as you expected. + * + * @param $server optional web server hostname for picking config + * @param $path optional URL path for picking config + * @param $conffile optional configuration file path + * + * @throws NoConfigException if config file can't be found + */ + public static function init($server=null, $path=null, $conffile=null) + { + StatusNet::initDefaults($server, $path); + StatusNet::loadConfigFile($conffile); + + // Load settings from database; note we need autoload for this + Config::loadSettings(); + + self::initPlugins(); + } + + /** + * Fire initialization events for all instantiated plugins. + */ + protected static function initPlugins() + { + // Load default plugins + foreach (common_config('plugins', 'default') as $name => $params) { + if (is_null($params)) { + addPlugin($name); + } else if (is_array($params)) { + if (count($params) == 0) { + addPlugin($name); + } else { + $keys = array_keys($params); + if (is_string($keys[0])) { + addPlugin($name, $params); + } else { + foreach ($params as $paramset) { + addPlugin($name, $paramset); + } + } + } + } + } + + // XXX: if plugins should check the schema at runtime, do that here. + if (common_config('db', 'schemacheck') == 'runtime') { + Event::handle('CheckSchema'); + } + + // Give plugins a chance to initialize in a fully-prepared environment + Event::handle('InitializePlugin'); + } + + /** + * Quick-check if configuration has been established. + * Useful for functions which may get used partway through + * initialization to back off from fancier things. + * + * @return bool + */ + public function haveConfig() + { + return self::$have_config; + } + + /** + * Build default configuration array + * @return array + */ + protected static function defaultConfig() + { + global $_server, $_path; + require(INSTALLDIR.'/lib/default.php'); + return $default; + } + + /** + * Establish default configuration based on given or default server and path + * Sets global $_server, $_path, and $config + */ + protected static function initDefaults($server, $path) + { + global $_server, $_path, $config; + + Event::clearHandlers(); + + // try to figure out where we are. $server and $path + // can be set by including module, else we guess based + // on HTTP info. + + if (isset($server)) { + $_server = $server; + } else { + $_server = array_key_exists('SERVER_NAME', $_SERVER) ? + strtolower($_SERVER['SERVER_NAME']) : + null; + } + + if (isset($path)) { + $_path = $path; + } else { + $_path = (array_key_exists('SERVER_NAME', $_SERVER) && array_key_exists('SCRIPT_NAME', $_SERVER)) ? + self::_sn_to_path($_SERVER['SCRIPT_NAME']) : + null; + } + + // Set config values initially to default values + $default = self::defaultConfig(); + $config = $default; + + // default configuration, overwritten in config.php + // Keep DB_DataObject's db config synced to ours... + + $config['db'] = &PEAR::getStaticProperty('DB_DataObject','options'); + + $config['db'] = $default['db']; + + // Backward compatibility + + $config['site']['design'] =& $config['design']; + + if (function_exists('date_default_timezone_set')) { + /* Work internally in UTC */ + date_default_timezone_set('UTC'); + } + } + + protected function _sn_to_path($sn) + { + $past_root = substr($sn, 1); + $last_slash = strrpos($past_root, '/'); + if ($last_slash > 0) { + $p = substr($past_root, 0, $last_slash); + } else { + $p = ''; + } + return $p; + } + + /** + * Load the default or specified configuration file. + * Modifies global $config and may establish plugins. + * + * @throws NoConfigException + */ + protected function loadConfigFile($conffile=null) + { + global $_server, $_path, $config; + + // From most general to most specific: + // server-wide, then vhost-wide, then for a path, + // finally for a dir (usually only need one of the last two). + + if (isset($conffile)) { + $config_files = array($conffile); + } else { + $config_files = array('/etc/statusnet/statusnet.php', + '/etc/statusnet/laconica.php', + '/etc/laconica/laconica.php', + '/etc/statusnet/'.$_server.'.php', + '/etc/laconica/'.$_server.'.php'); + + if (strlen($_path) > 0) { + $config_files[] = '/etc/statusnet/'.$_server.'_'.$_path.'.php'; + $config_files[] = '/etc/laconica/'.$_server.'_'.$_path.'.php'; + } + + $config_files[] = INSTALLDIR.'/config.php'; + } + + self::$have_config = false; + + foreach ($config_files as $_config_file) { + if (@file_exists($_config_file)) { + include($_config_file); + self::$have_config = true; + } + } + + if (!self::$have_config) { + throw new NoConfigException("No configuration file found.", + $config_files); + } + + // Fixup for statusnet.ini + $_db_name = substr($config['db']['database'], strrpos($config['db']['database'], '/') + 1); + + if ($_db_name != 'statusnet' && !array_key_exists('ini_'.$_db_name, $config['db'])) { + $config['db']['ini_'.$_db_name] = INSTALLDIR.'/classes/statusnet.ini'; + } + + // Backwards compatibility + + if (array_key_exists('memcached', $config)) { + if ($config['memcached']['enabled']) { + addPlugin('Memcache', array('servers' => $config['memcached']['server'])); + } + + if (!empty($config['memcached']['base'])) { + $config['cache']['base'] = $config['memcached']['base']; + } + } + } +} + +class NoConfigException extends Exception +{ + public $config_files; + + function __construct($msg, $config_files) { + parent::__construct($msg); + $this->config_files = $config_files; + } +} |