gnu-social/lib/plugin.php

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<?php
/**
* StatusNet, the distributed open-source microblogging tool
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*
* Utility class for plugins
*
* PHP version 5
*
* LICENCE: 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/>.
*
* @category Plugin
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2008 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
if (!defined('STATUSNET') && !defined('LACONICA')) {
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exit(1);
}
/**
* Base class for plugins
*
* A base class for StatusNet plugins. Mostly a light wrapper around
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* the Event framework.
*
* Subclasses of Plugin will automatically handle an event if they define
* a method called "onEventName". (Well, OK -- only if they call parent::__construct()
* in their constructors.)
*
* They will also automatically handle the InitializePlugin and CleanupPlugin with the
* initialize() and cleanup() methods, respectively.
*
* @category Plugin
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*
* @see Event
*/
class Plugin
{
function __construct()
{
Event::addHandler('InitializePlugin', array($this, 'initialize'));
Event::addHandler('CleanupPlugin', array($this, 'cleanup'));
foreach (get_class_methods($this) as $method) {
if (mb_substr($method, 0, 2) == 'on') {
Event::addHandler(mb_substr($method, 2), array($this, $method));
}
}
$this->setupGettext();
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}
function initialize()
{
return true;
}
function cleanup()
{
return true;
}
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/**
* Load related modules when needed
*
* Most non-trivial plugins will require extra modules to do their work. Typically
* these include data classes, action classes, widget classes, or external libraries.
*
* This method receives a class name and loads the PHP file related to that class. By
* tradition, action classes typically have files named for the action, all lower-case.
* Data classes are in files with the data class name, initial letter capitalized.
*
* Note that this method will be called for *all* overloaded classes, not just ones
* in this plugin! So, make sure to return true by default to let other plugins, and
* the core code, get a chance.
*
* @param string $cls Name of the class to be loaded
*
* @return boolean hook value; true means continue processing, false means stop.
*/
public function onAutoload($cls) {
$cls = basename($cls);
$basedir = INSTALLDIR . '/plugins/' . mb_substr(get_called_class(), 0, -6);
$file = null;
if (preg_match('/^(\w+)(Action|Form)$/', $cls, $type)) {
$type = array_map('strtolower', $type);
$file = "$basedir/{$type[2]}s/{$type[1]}.php";
}
if (!file_exists($file)) {
$file = "$basedir/classes/{$cls}.php";
// library files can be put into subdirs ('_'->'/' conversion)
// such as LRDDMethod_WebFinger -> lib/lrddmethod/webfinger.php
if (!file_exists($file)) {
$type = strtolower($cls);
$type = str_replace('_', '/', $type);
$file = "$basedir/lib/{$type}.php";
}
}
if (!is_null($file) && file_exists($file)) {
require_once($file);
return false;
}
return true;
}
/**
* Checks if this plugin has localization that needs to be set up.
* Gettext localizations can be called via the _m() helper function.
*/
protected function setupGettext()
{
$class = get_class($this);
if (substr($class, -6) == 'Plugin') {
$name = substr($class, 0, -6);
$path = common_config('plugins', 'locale_path');
if (!$path) {
// @fixme this will fail for things installed in local/plugins
// ... but then so will web links so far.
$path = INSTALLDIR . "/plugins/$name/locale";
}
if (file_exists($path) && is_dir($path)) {
bindtextdomain($name, $path);
bind_textdomain_codeset($name, 'UTF-8');
}
}
}
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protected function log($level, $msg)
{
common_log($level, get_class($this) . ': '.$msg);
}
protected function debug($msg)
{
$this->log(LOG_DEBUG, $msg);
}
public function name()
{
$cls = get_class($this);
return mb_substr($cls, 0, -6);
}
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public function version()
{
return GNUSOCIAL_VERSION;
}
protected function userAgent() {
return HTTPClient::userAgent()
. ' (' . get_class($this) . ' v' . $this->version() . ')';
}
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function onPluginVersion(&$versions)
{
$name = $this->name();
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$versions[] = array('name' => $name,
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// TRANS: Displayed as version information for a plugin if no version information was found.
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'version' => _('Unknown'));
return true;
}
function path($relative)
{
return self::staticPath($this->name(), $relative);
}
static function staticPath($plugin, $relative)
{
$isHTTPS = StatusNet::isHTTPS();
if ($isHTTPS) {
$server = common_config('plugins', 'sslserver');
} else {
$server = common_config('plugins', 'server');
}
if (empty($server)) {
if ($isHTTPS) {
$server = common_config('site', 'sslserver');
}
if (empty($server)) {
$server = common_config('site', 'server');
}
}
if ($isHTTPS) {
$path = common_config('plugins', 'sslpath');
} else {
$path = common_config('plugins', 'path');
}
if (empty($path)) {
// XXX: extra stat().
if (@file_exists(INSTALLDIR.'/local/plugins/'.$plugin.'/'.$relative)) {
$path = common_config('site', 'path') . '/local/plugins/';
} else {
$path = common_config('site', 'path') . '/plugins/';
}
}
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if ($path[strlen($path)-1] != '/') {
$path .= '/';
}
if ($path[0] != '/') {
$path = '/'.$path;
}
$protocol = ($isHTTPS) ? 'https' : 'http';
return $protocol.'://'.$server.$path.$plugin.'/'.$relative;
}
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}