326 lines
10 KiB
PHP
326 lines
10 KiB
PHP
<?php
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/**
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* Piwik - Open source web analytics
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*
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* @link http://piwik.org
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* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
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*
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*/
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namespace Piwik;
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use Piwik\Plugin\Dependency;
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use Piwik\Plugin\MetadataLoader;
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/**
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* @see Piwik\Plugin\MetadataLoader
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*/
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require_once PIWIK_INCLUDE_PATH . '/core/Plugin/MetadataLoader.php';
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/**
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* Base class of all Plugin Descriptor classes.
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*
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* Any plugin that wants to add event observers to one of Piwik's {@hook # hooks},
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* or has special installation/uninstallation logic must implement this class.
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* Plugins that can specify everything they need to in the _plugin.json_ files,
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* such as themes, don't need to implement this class.
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*
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* Class implementations should be named after the plugin they are a part of
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* (eg, `class UserCountry extends Plugin`).
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*
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* ### Plugin Metadata
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*
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* In addition to providing a place for plugins to install/uninstall themselves
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* and add event observers, this class is also responsible for loading metadata
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* found in the plugin.json file.
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*
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* The plugin.json file must exist in the root directory of a plugin. It can
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* contain the following information:
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*
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* - **description**: An internationalized string description of what the plugin
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* does.
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* - **homepage**: The URL to the plugin's website.
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* - **authors**: A list of author arrays with keys for 'name', 'email' and 'homepage'
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* - **license**: The license the code uses (eg, GPL, MIT, etc.).
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* - **license_homepage**: URL to website describing the license used.
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* - **version**: The plugin version (eg, 1.0.1).
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* - **theme**: `true` or `false`. If `true`, the plugin will be treated as a theme.
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*
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* ### Examples
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*
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* **How to extend**
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*
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* use Piwik\Common;
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* use Piwik\Plugin;
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* use Piwik\Db;
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*
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* class MyPlugin extends Plugin
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* {
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* public function getListHooksRegistered()
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* {
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* return array(
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* 'API.getReportMetadata' => 'getReportMetadata',
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* 'Another.event' => array(
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* 'function' => 'myOtherPluginFunction',
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* 'after' => true // executes this callback after others
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* )
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* );
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* }
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*
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* public function install()
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* {
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* Db::exec("CREATE TABLE " . Common::prefixTable('mytable') . "...");
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* }
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*
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* public function uninstall()
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* {
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* Db::exec("DROP TABLE IF EXISTS " . Common::prefixTable('mytable'));
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* }
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*
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* public function getReportMetadata(&$metadata)
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* {
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* // ...
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* }
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*
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* public function myOtherPluginFunction()
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* {
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* // ...
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* }
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* }
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*
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* @api
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*/
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class Plugin
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{
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/**
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* Name of this plugin.
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*
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* @var string
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*/
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protected $pluginName;
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/**
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* Holds plugin metadata.
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*
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* @var array
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*/
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private $pluginInformation;
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/**
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* Constructor.
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*
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* @param string|bool $pluginName A plugin name to force. If not supplied, it is set
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* to the last part of the class name.
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* @throws \Exception If plugin metadata is defined in both the getInformation() method
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* and the **plugin.json** file.
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*/
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public function __construct($pluginName = false)
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{
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if (empty($pluginName)) {
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$pluginName = explode('\\', get_class($this));
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$pluginName = end($pluginName);
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}
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$this->pluginName = $pluginName;
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$metadataLoader = new MetadataLoader($pluginName);
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$this->pluginInformation = $metadataLoader->load();
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if ($this->hasDefinedPluginInformationInPluginClass() && $metadataLoader->hasPluginJson()) {
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throw new \Exception('Plugin ' . $pluginName . ' has defined the method getInformation() and as well as having a plugin.json file. Please delete the getInformation() method from the plugin class. Alternatively, you may delete the plugin directory from plugins/' . $pluginName);
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}
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}
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private function hasDefinedPluginInformationInPluginClass()
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{
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$myClassName = get_class();
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$pluginClassName = get_class($this);
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if ($pluginClassName == $myClassName) {
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// plugin has not defined its own class
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return false;
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}
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$foo = new \ReflectionMethod(get_class($this), 'getInformation');
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$declaringClass = $foo->getDeclaringClass()->getName();
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return $declaringClass != $myClassName;
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}
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/**
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* Returns plugin information, including:
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*
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* - 'description' => string // 1-2 sentence description of the plugin
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* - 'author' => string // plugin author
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* - 'author_homepage' => string // author homepage URL (or email "mailto:youremail@example.org")
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* - 'homepage' => string // plugin homepage URL
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* - 'license' => string // plugin license
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* - 'license_homepage' => string // license homepage URL
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* - 'version' => string // plugin version number; examples and 3rd party plugins must not use Version::VERSION; 3rd party plugins must increment the version number with each plugin release
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* - 'theme' => bool // Whether this plugin is a theme (a theme is a plugin, but a plugin is not necessarily a theme)
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*
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* @return array
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* @deprecated
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*/
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public function getInformation()
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{
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return $this->pluginInformation;
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}
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/**
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* Returns a list of hooks with associated event observers.
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*
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* Derived classes should use this method to associate callbacks with events.
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*
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* @return array eg,
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*
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* array(
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* 'API.getReportMetadata' => 'myPluginFunction',
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* 'Another.event' => array(
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* 'function' => 'myOtherPluginFunction',
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* 'after' => true // execute after callbacks w/o ordering
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* )
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* 'Yet.Another.event' => array(
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* 'function' => 'myOtherPluginFunction',
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* 'before' => true // execute before callbacks w/o ordering
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* )
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* )
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*/
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public function getListHooksRegistered()
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{
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return array();
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}
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/**
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* This method is executed after a plugin is loaded and translations are registered.
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* Useful for initialization code that uses translated strings.
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*/
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public function postLoad()
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{
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return;
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}
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/**
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* Installs the plugin. Derived classes should implement this class if the plugin
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* needs to:
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*
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* - create tables
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* - update existing tables
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* - etc.
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*
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* @throws Exception if installation of fails for some reason.
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*/
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public function install()
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{
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return;
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}
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/**
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* Uninstalls the plugins. Derived classes should implement this method if the changes
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* made in {@link install()} need to be undone during uninstallation.
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*
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* In most cases, if you have an {@link install()} method, you should provide
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* an {@link uninstall()} method.
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*
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* @throws \Exception if uninstallation of fails for some reason.
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*/
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public function uninstall()
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{
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return;
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}
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/**
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* Executed every time the plugin is enabled.
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*/
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public function activate()
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{
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return;
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}
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/**
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* Executed every time the plugin is disabled.
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*/
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public function deactivate()
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{
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return;
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}
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/**
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* Returns the plugin version number.
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*
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* @return string
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*/
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final public function getVersion()
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{
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$info = $this->getInformation();
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return $info['version'];
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}
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/**
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* Returns `true` if this plugin is a theme, `false` if otherwise.
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*
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* @return bool
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*/
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public function isTheme()
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{
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$info = $this->getInformation();
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return !empty($info['theme']) && (bool)$info['theme'];
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}
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/**
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* Returns the plugin's base class name without the namespace,
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* e.g., `"UserCountry"` when the plugin class is `"Piwik\Plugins\UserCountry\UserCountry"`.
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*
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* @return string
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*/
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final public function getPluginName()
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{
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return $this->pluginName;
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}
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/**
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* Detect whether there are any missing dependencies.
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*
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* @param null $piwikVersion Defaults to the current Piwik version
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* @return bool
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*/
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public function hasMissingDependencies($piwikVersion = null)
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{
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$requirements = $this->getMissingDependencies($piwikVersion);
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return !empty($requirements);
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}
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public function getMissingDependencies($piwikVersion = null)
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{
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if (empty($this->pluginInformation['require'])) {
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return array();
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}
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$dependency = new Dependency();
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if (!is_null($piwikVersion)) {
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$dependency->setPiwikVersion($piwikVersion);
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}
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return $dependency->getMissingDependencies($this->pluginInformation['require']);
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}
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/**
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* Extracts the plugin name from a backtrace array. Returns `false` if we can't find one.
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*
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* @param array $backtrace The result of {@link debug_backtrace()} or
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* [Exception::getTrace()](http://www.php.net/manual/en/exception.gettrace.php).
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* @return string|false
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*/
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public static function getPluginNameFromBacktrace($backtrace)
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{
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foreach ($backtrace as $tracepoint) {
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// try and discern the plugin name
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if (isset($tracepoint['class'])
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&& preg_match("/Piwik\\\\Plugins\\\\([a-zA-Z_0-9]+)\\\\/", $tracepoint['class'], $matches)
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) {
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return $matches[1];
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}
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}
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return false;
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}
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}
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