gnu-social/lib/gnusocial.php

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<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2009-2010 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('GNUSOCIAL')) { exit(1); }
global $config, $_server, $_path;
/**
* Global configuration setup and management.
*/
class GNUsocial
{
protected static $config_files = array();
protected static $have_config;
protected static $is_api;
protected static $is_ajax;
protected static $plugins = array();
/**
* 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, array $attrs=array())
{
$name = ucfirst($name);
if (isset(self::$plugins[$name])) {
// We have already loaded this plugin. Don't try to
// do it again with (possibly) different values.
// Försten till kvarn får mala.
return true;
}
$pluginclass = "{$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("Plugin $name not found.", 500);
}
}
// Doesn't this $inst risk being garbage collected or something?
// TODO: put into a static array that makes sure $inst isn't lost.
$inst = new $pluginclass();
foreach ($attrs as $aname => $avalue) {
$inst->$aname = $avalue;
}
// Record activated plugins for later display/config dump
self::$plugins[$name] = $attrs;
return true;
}
public static function delPlugin($name)
{
// Remove our plugin if it was previously loaded
$name = ucfirst($name);
if (isset(self::$plugins[$name])) {
unset(self::$plugins[$name]);
}
// make sure initPlugins will avoid this
common_config_set('plugins', 'disable-'.$name, true);
return true;
}
/**
* Get a list of activated plugins in this process.
* @return array of (string $name, array $args) pairs
*/
public static function getActivePlugins()
{
return self::$plugins;
}
/**
* Initialize, or re-initialize, GNU social 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, $conffile=null)
{
Router::clear();
self::initDefaults($server, $path);
self::loadConfigFile($conffile);
$sprofile = common_config('site', 'profile');
if (!empty($sprofile)) {
self::loadSiteProfile($sprofile);
}
// Load settings from database; note we need autoload for this
Config::loadSettings();
self::verifyLoadedConfig();
self::initPlugins();
}
/**
* Get identifier of the currently active site configuration
* @return string
*/
public static function currentSite()
{
return common_config('site', 'nickname');
}
/**
* Change site configuration to site specified by nickname,
* if set up via Status_network. If not, sites other than
* the current will fail horribly.
*
* May throw exception or trigger a fatal error if the given
* site is missing or configured incorrectly.
*
* @param string $nickname
*/
public static function switchSite($nickname)
{
if ($nickname == self::currentSite()) {
return true;
}
$sn = Status_network::getKV('nickname', $nickname);
if (empty($sn)) {
return false;
throw new Exception("No such site nickname '$nickname'");
}
$server = $sn->getServerName();
self::init($server);
}
/**
* Pull all local sites from status_network table.
*
* Behavior undefined if site is not configured via Status_network.
*
* @return array of nicknames
*/
public static function findAllSites()
{
$sites = array();
$sn = new Status_network();
$sn->find();
while ($sn->fetch()) {
$sites[] = $sn->nickname;
}
return $sites;
}
/**
* Fire initialization events for all instantiated plugins.
*/
protected static function initPlugins()
{
// User config may have already added some of these plugins, with
// maybe configured parameters. The self::addPlugin function will
// ignore the new call if it has already been instantiated.
// Load core plugins
foreach (common_config('plugins', 'core') as $name => $params) {
call_user_func('self::addPlugin', $name, $params);
}
// Load default plugins
foreach (common_config('plugins', 'default') as $name => $params) {
$key = 'disable-' . $name;
if (common_config('plugins', $key)) {
continue;
}
// TODO: We should be able to avoid this is_null and assume $params
// is an array, since that's how it is typed in addPlugin
if (is_null($params)) {
self::addPlugin($name);
} else if (is_array($params)) {
if (count($params) == 0) {
self::addPlugin($name);
} else {
$keys = array_keys($params);
if (is_string($keys[0])) {
self::addPlugin($name, $params);
} else {
foreach ($params as $paramset) {
self::addPlugin($name, $paramset);
}
}
}
}
}
// XXX: if plugins should check the schema at runtime, do that here.
if (common_config('db', 'schemacheck') == 'runtime') {
Event::handle('CheckSchema');
}
// Give plugins a chance to initialize in a fully-prepared environment
Event::handle('InitializePlugin');
}
/**
* Quick-check if configuration has been established.
* Useful for functions which may get used partway through
* initialization to back off from fancier things.
*
* @return bool
*/
public static function haveConfig()
{
return self::$have_config;
}
/**
* Returns a list of configuration files that have
* been loaded for this instance of GNU social.
*/
public static function configFiles()
{
return self::$config_files;
}
public static function isApi()
{
return self::$is_api;
}
public static function setApi($mode)
{
self::$is_api = $mode;
}
public static function isAjax()
{
return self::$is_ajax;
}
public static function setAjax($mode)
{
self::$is_ajax = $mode;
}
/**
* 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 $config
*/
public static function initDefaults($server, $path)
{
global $_server, $_path, $config, $_PEAR;
Event::clearHandlers();
self::$plugins = array();
// 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'] = $default['db'];
if (function_exists('date_default_timezone_set')) {
/* Work internally in UTC */
date_default_timezone_set('UTC');
}
}
public static function loadSiteProfile($name)
{
global $config;
$settings = SiteProfile::getSettings($name);
$config = array_replace_recursive($config, $settings);
}
protected static function _sn_to_path($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 $config and may establish plugins.
*
* @throws NoConfigException
*/
protected static function loadConfigFile($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 {
$config_files = array('/etc/gnusocial/config.php',
'/etc/gnusocial/config.d/'.$_server.'.php');
if (strlen($_path) > 0) {
$config_files[] = '/etc/gnusocial/config.d/'.$_server.'_'.$_path.'.php';
}
$config_files[] = INSTALLDIR.'/config.php';
}
self::$have_config = false;
foreach ($config_files as $_config_file) {
if (@file_exists($_config_file)) {
// Ignore 0-byte config files
if (filesize($_config_file) > 0) {
include($_config_file);
self::$config_files[] = $_config_file;
self::$have_config = true;
}
}
}
if (!self::$have_config) {
throw new NoConfigException("No configuration file found.",
$config_files);
}
// Check for database server; must exist!
if (empty($config['db']['database'])) {
throw new ServerException("No database server for this site.");
}
}
/**
* Verify that the loaded config is good. Not complete, but will
* throw exceptions on common configuration problems I hope.
*
* Might make changes to the filesystem, to created dirs, but will
* not make database changes.
*/
static function verifyLoadedConfig()
{
if (common_config('htmlpurifier', 'Cache.DefinitionImpl') === 'Serializer'
&& !is_dir(common_config('htmlpurifier', 'Cache.SerializerPath'))) {
if (!mkdir(common_config('htmlpurifier', 'Cache.SerializerPath'))) {
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throw new ConfigException('Could not create HTMLPurifier cache dir: '._ve(common_config('htmlpurifier', 'Cache.SerializerPath')));
}
}
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if (!is_array(common_config('public', 'autosource'))) {
throw new ConfigException('Configuration option public/autosource is not an array.');
}
}
/**
* Are we running from the web with HTTPS?
*
* @return boolean true if we're running with HTTPS; else false
*/
static function isHTTPS()
{
if (common_config('site', 'sslproxy')) {
return true;
}
// There are some exceptions to this; add them here!
if (empty($_SERVER['HTTPS'])) {
return false;
}
// If it is _not_ "off", it is on, so "true".
return strtolower($_SERVER['HTTPS']) !== 'off';
}
/**
* Can we use HTTPS? Then do! Only return false if it's not configured ("never").
*/
static function useHTTPS()
{
return self::isHTTPS() || common_config('site', 'ssl') != 'never';
}
}
class NoConfigException extends Exception
{
public $configFiles;
function __construct($msg, $configFiles) {
parent::__construct($msg);
$this->configFiles = $configFiles;
}
}