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397 lines
15 KiB
397 lines
15 KiB
<?php
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/* For licensing terms, see /license.txt */
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/**
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* Base class for plugins
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*
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* This class has to be extended by every plugin. It defines basic methods
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* to install/uninstall and get information about a plugin
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*
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* @copyright (c) 2012 University of Geneva
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* @license GNU General Public License - http://www.gnu.org/copyleft/gpl.html
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* @author Laurent Opprecht <laurent@opprecht.info>
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* @author Julio Montoya <gugli100@gmail.com> added course settings support + lang variable fixes
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* @author Yannick Warnier <ywarnier@beeznest.org> added documentation
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*
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*/
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class Plugin {
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protected $version = '';
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protected $author = '';
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protected $fields = array();
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private $settings = null;
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private $strings = null; //translation strings
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public $is_course_plugin = false;
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/**
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* When creating a new course, these settings are added to the course, in
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* the course_info/infocours.php
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* To show the plugin course icons you need to add these icons:
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* main/img/icons/22/plugin_name.png
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* main/img/icons/64/plugin_name.png
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* main/img/icons/64/plugin_name_na.png
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* @example
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* $course_settings = array(
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array('name' => 'big_blue_button_welcome_message', 'type' => 'text'),
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array('name' => 'big_blue_button_record_and_store', 'type' => 'checkbox')
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);
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*/
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public $course_settings = array();
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/**
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* This indicates whether changing the setting should execute the callback
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* function.
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*/
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public $course_settings_callback = false;
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/**
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* Default constructor for the plugin class. By default, it only sets
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* a few attributes of the object
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* @param string Version of this plugin
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* @param string Author of this plugin
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* @param array Array of global settings to be proposed to configure the plugin
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* @return void
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*/
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protected function __construct($version, $author, $settings = array()) {
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$this->version = $version;
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$this->author = $author;
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$this->fields = $settings;
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global $language_files;
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$language_files[] = 'plugin_' . $this->get_name();
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}
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/**
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* Gets an array of information about this plugin (name, version, ...)
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* @return array Array of information elements about this plugin
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*/
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function get_info() {
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$result = array();
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$result['title'] = $this->get_title();
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$result['comment'] = $this->get_comment();
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$result['version'] = $this->get_version();
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$result['author'] = $this->get_author();
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$result['plugin_class'] = get_class($this);
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$result['is_course_plugin'] = $this->is_course_plugin;
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if ($form = $this->get_settings_form()) {
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$result['settings_form'] = $form;
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foreach ($this->fields as $name => $type) {
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$value = $this->get($name);
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$result[$name] = $value;
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}
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}
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return $result;
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}
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/**
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* Returns the "system" name of the plugin in lowercase letters
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* @param string Name of the plugin
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*/
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function get_name() {
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$result = get_class($this);
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$result = str_replace('Plugin', '', $result);
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$result = strtolower($result);
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return $result;
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}
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/**
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* Returns the title of the plugin
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* @param string Title of the plugin
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*/
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function get_title() {
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return $this->get_lang('plugin_title');
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}
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/**
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* Returns the description of the plugin
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* @param string Description of the plugin
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*/
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function get_comment() {
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return $this->get_lang('plugin_comment');
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}
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/**
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* Returns the version of the plugin
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* @param string Version of the plugin
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*/
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function get_version() {
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return $this->version;
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}
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/**
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* Returns the author of the plugin
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* @param string Author(s) of the plugin
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*/
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function get_author() {
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return $this->author;
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}
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/**
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* Returns the contents of the CSS defined by the plugin
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* @param string The CSS string
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*/
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function get_css() {
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$name = $this->get_name();
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$path = api_get_path(SYS_PLUGIN_PATH)."$name/resources/$name.css";
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if (!is_readable($path)) {
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return '';
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}
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$css = array();
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$css[] = file_get_contents($path);
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$result = implode($css);
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return $result;
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}
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/**
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* Returns an HTML form (generated by FormValidator) of the plugin settings
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* @return string FormValidator-generated form
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*/
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function get_settings_form() {
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$result = new FormValidator($this->get_name());
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$defaults = array();
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foreach ($this->fields as $name => $type) {
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$value = $this->get($name);
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$defaults[$name] = $value;
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$type = isset($type) ? $type : 'text';
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$help = null;
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if ($this->get_lang_plugin_exists($name.'_help')) {
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$help = $this->get_lang($name.'_help');
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}
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switch ($type) {
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case 'html':
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$result->addElement('html', $this->get_lang($name));
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break;
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case 'wysiwyg':
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$result->add_html_editor($name, $this->get_lang($name));
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break;
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case 'text':
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$result->addElement($type, $name, array($this->get_lang($name), $help));
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break;
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case 'boolean':
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$group = array();
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$group[] = $result->createElement('radio', $name, '', get_lang('Yes'), 'true');
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$group[] = $result->createElement('radio', $name, '', get_lang('No'), 'false');
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$result->addGroup($group, null, array($this->get_lang($name), $help));
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break;
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}
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}
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$result->setDefaults($defaults);
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$result->addElement('style_submit_button', 'submit_button', $this->get_lang('Save'));
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return $result;
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}
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/**
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* Returns the value of a given plugin global setting
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* @param string Name of the plugin
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* @return string Value of the plugin
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*/
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function get($name) {
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$settings = $this->get_settings();
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foreach ($settings as $setting) {
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if ($setting['variable'] == ($this->get_name() . '_' . $name)) {
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return $setting['selected_value'];
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}
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}
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return false;
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}
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/**
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* Returns an array with the global settings for this plugin
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* @return array Plugin settings as an array
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*/
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public function get_settings() {
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if (is_null($this->settings)) {
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$settings = api_get_settings_params(array("subkey = ? AND category = ? AND type = ? " => array($this->get_name(), 'Plugins', 'setting')));
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$this->settings = $settings;
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}
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return $this->settings;
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}
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/**
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* Tells whether language variables are defined for this plugin or not
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* @param string System name of the plugin
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* @return boolean True if the plugin has languag variables defined, false otherwise
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*/
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public function get_lang_plugin_exists($name) {
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return isset($this->strings[$name]);
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}
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/**
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* Hook for the get_lang() function to check for plugin-defined language terms
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* @param string Name of the language variable we are looking for
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* @return string The translated language term of the plugin
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*/
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public function get_lang($name) {
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// Check whether the language strings for the plugin have already been
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// loaded. If so, no need to load them again.
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if (is_null($this->strings)) {
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global $language_interface;
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$root = api_get_path(SYS_PLUGIN_PATH);
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$plugin_name = $this->get_name();
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//1. Loading english if exists
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$english_path = $root.$plugin_name."/lang/english.php";
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if (is_readable($english_path)) {
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include $english_path;
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$this->strings = $strings;
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}
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$path = $root.$plugin_name."/lang/$language_interface.php";
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//2. Loading the system language
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if (is_readable($path)) {
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include $path;
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if (!empty($strings)) {
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foreach ($strings as $key => $string) {
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$this->strings[$key] = $string;
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}
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}
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}
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}
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if (isset($this->strings[$name])) {
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return $this->strings[$name];
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}
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return get_lang($name);
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}
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/**
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* Caller for the install_course_fields() function
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* @param int The course's integer ID
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* @param boolean Whether to add a tool link on the course homepage
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* @return void
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*/
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function course_install($course_id, $add_tool_link = true) {
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$this->install_course_fields($course_id, $add_tool_link);
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}
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/**
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* Add course settings and, if not asked otherwise, add a tool link on the course homepage
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* @param int Course integer ID
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* @param boolean Whether to add a tool link or not (some tools might just offer a configuration section and act on the backend)
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* @return boolean False on error, null otherwise
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*/
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public function install_course_fields($course_id, $add_tool_link = true) {
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$plugin_name = $this->get_name();
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$t_course = Database::get_course_table(TABLE_COURSE_SETTING);
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$course_id = intval($course_id);
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if (empty($course_id)) {
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return false;
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}
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//Ads course settings
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if (!empty($this->course_settings)) {
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foreach ($this->course_settings as $setting) {
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$variable = Database::escape_string($setting['name']);
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$value ='';
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if (isset($setting['init_value'])) {
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$value = Database::escape_string($setting['init_value']);
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}
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$type = 'textfield';
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if (isset($setting['type'])) {
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$type = Database::escape_string($setting['type']);
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}
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if (isset($setting['group'])) {
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$group = Database::escape_string($setting['group']);
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$sql = "SELECT value FROM $t_course WHERE c_id = $course_id AND variable = '$group' AND subkey = '$variable' ";
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$result = Database::query($sql);
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if (!Database::num_rows($result)) {
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$sql_course = "INSERT INTO $t_course (c_id, variable, subkey, value, category, type) VALUES ($course_id, '$group', '$variable', '$value', 'plugins', '$type')";
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$r = Database::query($sql_course);
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}
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} else {
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$sql = "SELECT value FROM $t_course WHERE c_id = $course_id AND variable = '$variable' ";
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$result = Database::query($sql);
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if (!Database::num_rows($result)) {
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$sql_course = "INSERT INTO $t_course (c_id, variable, value, category, subkey, type) VALUES ($course_id, '$variable','$value', 'plugins', '$plugin_name', '$type')";
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$r = Database::query($sql_course);
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}
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}
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}
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}
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// Stop here if we don't want a tool link on the course homepage
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if (!$add_tool_link) { return true; }
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//Add an icon in the table tool list
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$t_tool = Database::get_course_table(TABLE_TOOL_LIST);
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$sql = "SELECT name FROM $t_tool WHERE c_id = $course_id AND name = '$plugin_name' ";
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$result = Database::query($sql);
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if (!Database::num_rows($result)) {
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$tool_link = "$plugin_name/start.php";
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$visibility = string2binary(api_get_setting('course_create_active_tools', $plugin_name));
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$sql_course = "INSERT INTO $t_tool VALUES ($course_id, NULL, '$plugin_name', '$tool_link', '$plugin_name.png',' ".$visibility."','0', 'squaregrey.gif','NO','_self','plugin','0')";
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$r = Database::query($sql_course);
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}
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}
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/**
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* Delete the fields added to the course settings page and the link to the
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* tool on the course's homepage
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* @param int The integer course ID
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* @return void
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*/
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public function uninstall_course_fields($course_id) {
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$course_id = intval($course_id);
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if (empty($course_id)) {
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return false;
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}
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$plugin_name = $this->get_name();
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$t_course = Database::get_course_table(TABLE_COURSE_SETTING);
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$t_tool = Database::get_course_table(TABLE_TOOL_LIST);
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if (!empty($this->course_settings)) {
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foreach ($this->course_settings as $setting) {
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$variable = Database::escape_string($setting['name']);
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if (!empty($setting['group'])) {
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$variable = Database::escape_string($setting['group']);
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}
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$sql_course = "DELETE FROM $t_course WHERE c_id = $course_id AND variable = '$variable'";
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Database::query($sql_course);
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}
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}
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$sql_course = "DELETE FROM $t_tool WHERE c_id = $course_id AND name = '$plugin_name'";
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Database::query($sql_course);
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}
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/**
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* Install the course fields and tool link of this plugin in all courses
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* @param boolean Whether we want to add a plugin link on the course homepage
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* @return void
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*/
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function install_course_fields_in_all_courses($add_tool_link = true) {
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// Update existing courses to add conference settings
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$t_courses = Database::get_main_table(TABLE_MAIN_COURSE);
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$sql = "SELECT id, code FROM $t_courses ORDER BY id";
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$res = Database::query($sql);
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while ($row = Database::fetch_assoc($res)) {
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$this->install_course_fields($row['id'], $add_tool_link);
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}
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}
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/**
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* Uninstall the plugin settings fields from all courses
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* @return void
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*/
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function uninstall_course_fields_in_all_courses() {
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// Update existing courses to add conference settings
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$t_courses = Database::get_main_table(TABLE_MAIN_COURSE);
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$sql = "SELECT id, code FROM $t_courses ORDER BY id";
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$res = Database::query($sql);
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while ($row = Database::fetch_assoc($res)) {
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$this->uninstall_course_fields($row['id']);
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}
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}
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/**
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* Method to be extended when changing the setting in the course
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* configuration should trigger the use of a callback method
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* @param array Values sent back from the course configuration script
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* @return void
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*/
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private function course_settings_updated($values = array()) {
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}
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}
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