forked from GNUsocial/gnu-social
282 lines
9.7 KiB
PHP
282 lines
9.7 KiB
PHP
<?php
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/**
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2009, StatusNet, Inc.
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*
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* A sample module to show best practices for StatusNet plugins
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*
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* PHP version 5
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Sample
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* @package StatusNet
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* @author Brion Vibber <brionv@status.net>
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2009 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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if (!defined('STATUSNET')) {
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// This check helps protect against security problems;
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// your code file can't be executed directly from the web.
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exit(1);
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}
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/**
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* Sample plugin main class
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*
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* Each plugin requires a main class to interact with the StatusNet system.
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*
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* The main class usually extends the Plugin class that comes with StatusNet.
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*
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* The class has standard-named methods that will be called when certain events
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* happen in the code base. These methods have names like 'onX' where X is an
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* event name (see EVENTS.txt for the list of available events). Event handlers
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* have pre-defined arguments, based on which event they're handling. A typical
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* event handler:
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*
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* function onSomeEvent($paramA, &$paramB)
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* {
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* if ($paramA == 'jed') {
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* throw new Exception(sprintf(_m("Invalid parameter %s"), $paramA));
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* }
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* $paramB = 'spock';
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* return true;
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* }
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*
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* Event handlers must return a boolean value. If they return false, all other
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* event handlers for this event (in other plugins) will be skipped, and in some
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* cases the default processing for that event would be skipped. This is great for
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* replacing the default action of an event.
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*
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* If the handler returns true, processing of other event handlers and the default
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* processing will continue. This is great for extending existing functionality.
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*
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* If the handler throws an exception, processing will stop, and the exception's
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* error will be shown to the user.
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*
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* To install a plugin (like this one), site admins add the following code to
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* their config.php file:
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*
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* addPlugin('Sample');
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*
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* Plugins must be installed in one of the following directories:
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*
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* local/plugins/{$pluginclass}.php
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* local/plugins/{$name}/{$pluginclass}.php
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* local/{$pluginclass}.php
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* local/{$name}/{$pluginclass}.php
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* plugins/{$pluginclass}.php
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* plugins/{$name}/{$pluginclass}.php
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*
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* Here, {$name} is the name of the plugin, like 'Sample', and {$pluginclass} is
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* the name of the main class, like 'SamplePlugin'. Plugins that are part of the
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* main StatusNet distribution go in 'plugins' and third-party or local ones go
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* in 'local'.
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*
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* Simple plugins can be implemented as a single module. Others are more complex
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* and require additional modules; these should use their own directory, like
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* 'local/plugins/{$name}/'. All files related to the plugin, including images,
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* JavaScript, CSS, external libraries or PHP modules should go in the plugin
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* directory.
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*
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* @category Sample
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* @package StatusNet
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* @author Brion Vibber <brionv@status.net>
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2009 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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class SamplePlugin extends Plugin
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{
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/**
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* Plugins are configured using public instance attributes. To set
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* their values, site administrators use this syntax:
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*
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* addPlugin('Sample', array('attr1' => 'foo', 'attr2' => 'bar'));
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*
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* The same plugin class can be initialized multiple times with different
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* arguments:
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*
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* addPlugin('EmailNotify', array('sendTo' => 'evan@status.net'));
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* addPlugin('EmailNotify', array('sendTo' => 'brionv@status.net'));
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*
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*/
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public $attr1 = null;
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public $attr2 = null;
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/**
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* Initializer for this plugin
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*
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* Plugins overload this method to do any initialization they need,
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* like connecting to remote servers or creating paths or so on.
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*
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* @return boolean hook value; true means continue processing, false means stop.
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*/
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function initialize()
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{
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return true;
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}
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/**
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* Cleanup for this plugin
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*
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* Plugins overload this method to do any cleanup they need,
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* like disconnecting from remote servers or deleting temp files or so on.
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*
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* @return boolean hook value; true means continue processing, false means stop.
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*/
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function cleanup()
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{
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return true;
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}
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/**
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* Database schema setup
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*
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* Plugins can add their own tables to the StatusNet database. Plugins
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* should use StatusNet's schema interface to add or delete tables. The
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* ensureTable() method provides an easy way to ensure a table's structure
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* and availability.
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*
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* By default, the schema is checked every time StatusNet is run (say, when
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* a Web page is hit). Admins can configure their systems to only check the
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* schema when the checkschema.php script is run, greatly improving performance.
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* However, they need to remember to run that script after installing or
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* upgrading a plugin!
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*
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* @see Schema
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* @see ColumnDef
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*
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* @return boolean hook value; true means continue processing, false means stop.
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*/
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function onCheckSchema()
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{
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$schema = Schema::get();
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// For storing user-submitted flags on profiles
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$schema->ensureTable('user_greeting_count',
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array(new ColumnDef('user_id', 'integer', null,
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true, 'PRI'),
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new ColumnDef('greeting_count', 'integer')));
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return true;
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}
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/**
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* Load related modules when needed
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*
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* Most non-trivial plugins will require extra modules to do their work. Typically
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* these include data classes, action classes, widget classes, or external libraries.
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*
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* This method receives a class name and loads the PHP file related to that class. By
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* tradition, action classes typically have files named for the action, all lower-case.
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* Data classes are in files with the data class name, initial letter capitalized.
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*
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* Note that this method will be called for *all* overloaded classes, not just ones
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* in this plugin! So, make sure to return true by default to let other plugins, and
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* the core code, get a chance.
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*
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* @param string $cls Name of the class to be loaded
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*
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* @return boolean hook value; true means continue processing, false means stop.
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*/
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function onAutoload($cls)
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{
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$dir = dirname(__FILE__);
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switch ($cls)
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{
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case 'HelloAction':
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include_once $dir . '/' . strtolower(mb_substr($cls, 0, -6)) . '.php';
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return false;
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case 'User_greeting_count':
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include_once $dir . '/'.$cls.'.php';
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return false;
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default:
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return true;
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}
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}
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/**
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* Map URLs to actions
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*
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* This event handler lets the plugin map URLs on the site to actions (and
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* thus an action handler class). Note that the action handler class for an
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* action will be named 'FoobarAction', where action = 'foobar'. The class
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* must be loaded in the onAutoload() method.
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*
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* @param Net_URL_Mapper $m path-to-action mapper
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*
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* @return boolean hook value; true means continue processing, false means stop.
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*/
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function onRouterInitialized($m)
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{
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$m->connect('main/hello',
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array('action' => 'hello'));
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return true;
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}
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/**
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* Modify the default menu to link to our custom action
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*
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* Using event handlers, it's possible to modify the default UI for pages
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* almost without limit. In this method, we add a menu item to the default
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* primary menu for the interface to link to our action.
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*
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* The Action class provides a rich set of events to hook, as well as output
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* methods.
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*
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* @param Action $action The current action handler. Use this to
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* do any output.
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*
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* @return boolean hook value; true means continue processing, false means stop.
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*
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* @see Action
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*/
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function onEndPrimaryNav($action)
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{
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// common_local_url() gets the correct URL for the action name
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// we provide
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$action->menuItem(common_local_url('hello'),
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_m('Hello'), _m('A warm greeting'), false, 'nav_hello');
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return true;
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}
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function onPluginVersion(&$versions)
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{
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$versions[] = array('name' => 'Sample',
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'version' => STATUSNET_VERSION,
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'author' => 'Brion Vibber, Evan Prodromou',
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'homepage' => 'http://status.net/wiki/Plugin:Sample',
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'rawdescription' =>
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_m('A sample plugin to show basics of development for new hackers.'));
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return true;
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}
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}
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