3 * StatusNet - the distributed open-source microblogging tool
4 * Copyright (C) 2009, StatusNet, Inc.
6 * A sample module to show best practices for StatusNet plugins
10 * This program is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU Affero General Public License as published by
12 * the Free Software Foundation, either version 3 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Affero General Public License for more details.
20 * You should have received a copy of the GNU Affero General Public License
21 * along with this program. If not, see <http://www.gnu.org/licenses/>.
25 * @author Brion Vibber <brionv@status.net>
26 * @author Evan Prodromou <evan@status.net>
27 * @copyright 2009 StatusNet, Inc.
28 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
29 * @link http://status.net/
32 if (!defined('STATUSNET')) {
33 // This check helps protect against security problems;
34 // your code file can't be executed directly from the web.
39 * Sample plugin main class
41 * Each plugin requires a main class to interact with the StatusNet system.
43 * The main class usually extends the Plugin class that comes with StatusNet.
45 * The class has standard-named methods that will be called when certain events
46 * happen in the code base. These methods have names like 'onX' where X is an
47 * event name (see EVENTS.txt for the list of available events). Event handlers
48 * have pre-defined arguments, based on which event they're handling. A typical
51 * function onSomeEvent($paramA, &$paramB)
53 * if ($paramA == 'jed') {
54 * throw new Exception(sprintf(_m("Invalid parameter %s"), $paramA));
60 * Event handlers must return a boolean value. If they return false, all other
61 * event handlers for this event (in other plugins) will be skipped, and in some
62 * cases the default processing for that event would be skipped. This is great for
63 * replacing the default action of an event.
65 * If the handler returns true, processing of other event handlers and the default
66 * processing will continue. This is great for extending existing functionality.
68 * If the handler throws an exception, processing will stop, and the exception's
69 * error will be shown to the user.
71 * To install a plugin (like this one), site admins add the following code to
72 * their config.php file:
74 * addPlugin('Sample');
76 * Plugins must be installed in one of the following directories:
78 * local/plugins/{$pluginclass}.php
79 * local/plugins/{$name}/{$pluginclass}.php
80 * local/{$pluginclass}.php
81 * local/{$name}/{$pluginclass}.php
82 * plugins/{$pluginclass}.php
83 * plugins/{$name}/{$pluginclass}.php
85 * Here, {$name} is the name of the plugin, like 'Sample', and {$pluginclass} is
86 * the name of the main class, like 'SamplePlugin'. Plugins that are part of the
87 * main StatusNet distribution go in 'plugins' and third-party or local ones go
90 * Simple plugins can be implemented as a single module. Others are more complex
91 * and require additional modules; these should use their own directory, like
92 * 'local/plugins/{$name}/'. All files related to the plugin, including images,
93 * JavaScript, CSS, external libraries or PHP modules should go in the plugin
98 * @author Brion Vibber <brionv@status.net>
99 * @author Evan Prodromou <evan@status.net>
100 * @copyright 2009 StatusNet, Inc.
101 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
102 * @link http://status.net/
104 class SamplePlugin extends Plugin
107 * Plugins are configured using public instance attributes. To set
108 * their values, site administrators use this syntax:
110 * addPlugin('Sample', array('attr1' => 'foo', 'attr2' => 'bar'));
112 * The same plugin class can be initialized multiple times with different
115 * addPlugin('EmailNotify', array('sendTo' => 'evan@status.net'));
116 * addPlugin('EmailNotify', array('sendTo' => 'brionv@status.net'));
120 public $attr1 = null;
121 public $attr2 = null;
124 * Initializer for this plugin
126 * Plugins overload this method to do any initialization they need,
127 * like connecting to remote servers or creating paths or so on.
129 * @return boolean hook value; true means continue processing, false means stop.
131 function initialize()
137 * Cleanup for this plugin
139 * Plugins overload this method to do any cleanup they need,
140 * like disconnecting from remote servers or deleting temp files or so on.
142 * @return boolean hook value; true means continue processing, false means stop.
150 * Database schema setup
152 * Plugins can add their own tables to the StatusNet database. Plugins
153 * should use StatusNet's schema interface to add or delete tables. The
154 * ensureTable() method provides an easy way to ensure a table's structure
157 * By default, the schema is checked every time StatusNet is run (say, when
158 * a Web page is hit). Admins can configure their systems to only check the
159 * schema when the checkschema.php script is run, greatly improving performance.
160 * However, they need to remember to run that script after installing or
161 * upgrading a plugin!
166 * @return boolean hook value; true means continue processing, false means stop.
168 function onCheckSchema()
170 $schema = Schema::get();
172 // For storing user-submitted flags on profiles
174 $schema->ensureTable('user_greeting_count',
177 'user_id' => array('type' => 'int', 'not null' => true),
178 'greeting_count' => array('type' => 'int'),
180 'primary key' => array('user_id'),
181 'foreign keys' => array(
182 // Not all databases will support foreign keys, but even
183 // when not enforced it's helpful to include these definitions
185 'user_greeting_count_user_id_fkey' => array('user', array('user_id' => 'id')),
194 * Load related modules when needed
196 * Most non-trivial plugins will require extra modules to do their work. Typically
197 * these include data classes, action classes, widget classes, or external libraries.
199 * This method receives a class name and loads the PHP file related to that class. By
200 * tradition, action classes typically have files named for the action, all lower-case.
201 * Data classes are in files with the data class name, initial letter capitalized.
203 * Note that this method will be called for *all* overloaded classes, not just ones
204 * in this plugin! So, make sure to return true by default to let other plugins, and
205 * the core code, get a chance.
207 * @param string $cls Name of the class to be loaded
209 * @return boolean hook value; true means continue processing, false means stop.
211 function onAutoload($cls)
213 $dir = dirname(__FILE__);
218 include_once $dir . '/' . strtolower(mb_substr($cls, 0, -6)) . '.php';
220 case 'User_greeting_count':
221 include_once $dir . '/'.$cls.'.php';
229 * Map URLs to actions
231 * This event handler lets the plugin map URLs on the site to actions (and
232 * thus an action handler class). Note that the action handler class for an
233 * action will be named 'FoobarAction', where action = 'foobar'. The class
234 * must be loaded in the onAutoload() method.
236 * @param Net_URL_Mapper $m path-to-action mapper
238 * @return boolean hook value; true means continue processing, false means stop.
240 function onRouterInitialized($m)
242 $m->connect('main/hello',
243 array('action' => 'hello'));
248 * Modify the default menu to link to our custom action
250 * Using event handlers, it's possible to modify the default UI for pages
251 * almost without limit. In this method, we add a menu item to the default
252 * primary menu for the interface to link to our action.
254 * The Action class provides a rich set of events to hook, as well as output
257 * @param Action $action The current action handler. Use this to
260 * @return boolean hook value; true means continue processing, false means stop.
264 function onEndPrimaryNav($action)
266 // common_local_url() gets the correct URL for the action name
268 $action->menuItem(common_local_url('hello'),
269 // TRANS: Menu item in sample plugin.
271 // TRANS: Menu item title in sample plugin.
272 _m('A warm greeting'), false, 'nav_hello');
276 function onPluginVersion(&$versions)
278 $versions[] = array('name' => 'Sample',
279 'version' => STATUSNET_VERSION,
280 'author' => 'Brion Vibber, Evan Prodromou',
281 'homepage' => 'http://status.net/wiki/Plugin:Sample',
283 // TRANS: Plugin description.
284 _m('A sample plugin to show basics of development for new hackers.'));