Chamilo is a learning management system focused on ease of use and accessibility
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 
chamilo-lms/public/main/inc/lib/plugin.class.php

1024 lines
31 KiB

<?php
/* For licensing terms, see /license.txt */
use Chamilo\CourseBundle\Entity\CTool;
/**
* Class Plugin
* Base class for plugins.
*
* This class has to be extended by every plugin. It defines basic methods
* to install/uninstall and get information about a plugin
*
* @author Julio Montoya <gugli100@gmail.com>
* @author Yannick Warnier <ywarnier@beeznest.org>
* @author Laurent Opprecht <laurent@opprecht.info>
* @copyright 2012 University of Geneva
* @license GNU General Public License - http://www.gnu.org/copyleft/gpl.html
*/
class Plugin
{
const TAB_FILTER_NO_STUDENT = '::no-student';
const TAB_FILTER_ONLY_STUDENT = '::only-student';
public $isCoursePlugin = false;
public $isAdminPlugin = false;
public $isMailPlugin = false;
// Adds icon in the course home
public $addCourseTool = true;
public $hasPersonalEvents = false;
/**
* When creating a new course, these settings are added to the course, in
* the course_info/infocours.php
* To show the plugin course icons you need to add these icons:
* main/img/icons/22/plugin_name.png
* main/img/icons/64/plugin_name.png
* main/img/icons/64/plugin_name_na.png.
*
* @example
* $course_settings = array(
array('name' => 'big_blue_button_welcome_message', 'type' => 'text'),
array('name' => 'big_blue_button_record_and_store', 'type' => 'checkbox')
);
*/
public $course_settings = [];
/**
* This indicates whether changing the setting should execute the callback
* function.
*/
public $course_settings_callback = false;
protected $version = '';
protected $author = '';
protected $fields = [];
private $settings = [];
// Translation strings.
private $strings = null;
/**
* Default constructor for the plugin class. By default, it only sets
* a few attributes of the object.
*
* @param string $version of this plugin
* @param string $author of this plugin
* @param array $settings settings to be proposed to configure the plugin
*/
protected function __construct($version, $author, $settings = [])
{
$this->version = $version;
$this->author = $author;
$this->fields = $settings;
global $language_files;
$language_files[] = 'plugin_'.$this->get_name();
}
/**
* Gets an array of information about this plugin (name, version, ...).
*
* @return array Array of information elements about this plugin
*/
public function get_info()
{
$result = [];
$result['obj'] = $this;
$result['title'] = $this->get_title();
$result['comment'] = $this->get_comment();
$result['version'] = $this->get_version();
$result['author'] = $this->get_author();
$result['plugin_class'] = get_class($this);
$result['is_course_plugin'] = $this->isCoursePlugin;
$result['is_admin_plugin'] = $this->isAdminPlugin;
$result['is_mail_plugin'] = $this->isMailPlugin;
if ($form = $this->getSettingsForm()) {
$result['settings_form'] = $form;
foreach ($this->fields as $name => $type) {
$value = $this->get($name);
if (is_array($type)) {
$value = $type['options'];
}
$result[$name] = $value;
}
}
return $result;
}
/**
* Returns the "system" name of the plugin in lowercase letters.
*
* @return string
*/
public function get_name()
{
$result = get_class($this);
$result = str_replace('Plugin', '', $result);
$result = strtolower($result);
return $result;
}
/**
* @return string
*/
public function getCamelCaseName()
{
$result = get_class($this);
return str_replace('Plugin', '', $result);
}
/**
* Returns the title of the plugin.
*
* @return string
*/
public function get_title()
{
return $this->get_lang('plugin_title');
}
/**
* Returns the description of the plugin.
*
* @return string
*/
public function get_comment()
{
return $this->get_lang('plugin_comment');
}
/**
* Returns the version of the plugin.
*
* @return string
*/
public function get_version()
{
return $this->version;
}
/**
* Returns the author of the plugin.
*
* @return string
*/
public function get_author()
{
return $this->author;
}
/**
* Returns the contents of the CSS defined by the plugin.
*
* @return string
*/
public function get_css()
{
$name = $this->get_name();
$path = api_get_path(SYS_PLUGIN_PATH)."$name/resources/$name.css";
if (!is_readable($path)) {
return '';
}
$css = [];
$css[] = file_get_contents($path);
$result = implode($css);
return $result;
}
/**
* Returns an HTML form (generated by FormValidator) of the plugin settings.
*
* @return FormValidator FormValidator-generated form
*/
public function getSettingsForm()
{
$result = new FormValidator($this->get_name());
$defaults = [];
$checkboxGroup = [];
$checkboxCollection = [];
if ($checkboxNames = array_keys($this->fields, 'checkbox')) {
$pluginInfoCollection = api_get_settings('Plugins');
foreach ($pluginInfoCollection as $pluginInfo) {
if (array_search($pluginInfo['title'], $checkboxNames) !== false) {
$checkboxCollection[$pluginInfo['title']] = $pluginInfo;
}
}
}
foreach ($this->fields as $name => $type) {
$options = null;
if (is_array($type) && isset($type['type']) && $type['type'] === 'select') {
$attributes = isset($type['attributes']) ? $type['attributes'] : [];
if (!empty($type['options']) && isset($type['translate_options']) && $type['translate_options']) {
foreach ($type['options'] as $key => &$optionName) {
$optionName = $this->get_lang($optionName);
}
}
$options = $type['options'];
$type = $type['type'];
}
$value = $this->get($name);
$defaults[$name] = $value;
$type = isset($type) ? $type : 'text';
$help = null;
if ($this->get_lang_plugin_exists($name.'_help')) {
$help = $this->get_lang($name.'_help');
if ($name === "show_main_menu_tab") {
$pluginName = strtolower(str_replace('Plugin', '', get_class($this)));
$pluginUrl = api_get_path(WEB_PATH)."plugin/$pluginName/index.php";
$pluginUrl = "<a href=$pluginUrl>$pluginUrl</a>";
$help = sprintf($help, $pluginUrl);
}
}
switch ($type) {
case 'html':
$result->addHtml($this->get_lang($name));
break;
case 'wysiwyg':
$result->addHtmlEditor($name, $this->get_lang($name), false);
break;
case 'text':
$result->addElement($type, $name, [$this->get_lang($name), $help]);
break;
case 'boolean':
$group = [];
$group[] = $result->createElement(
'radio',
$name,
'',
get_lang('Yes'),
'true'
);
$group[] = $result->createElement(
'radio',
$name,
'',
get_lang('No'),
'false'
);
$result->addGroup($group, null, [$this->get_lang($name), $help]);
break;
case 'checkbox':
$selectedValue = null;
if (isset($checkboxCollection[$name])) {
if ($checkboxCollection[$name]['selected_value'] === 'true') {
$selectedValue = 'checked';
}
}
$element = $result->createElement(
$type,
$name,
'',
$this->get_lang($name),
$selectedValue
);
$element->_attributes['value'] = 'true';
$checkboxGroup[] = $element;
break;
case 'select':
$result->addElement(
$type,
$name,
[$this->get_lang($name), $help],
$options,
$attributes
);
break;
}
}
if (!empty($checkboxGroup)) {
$result->addGroup(
$checkboxGroup,
null,
[$this->get_lang('sms_types'), $help]
);
}
$result->setDefaults($defaults);
$result->addButtonSave($this->get_lang('Save'), 'submit_button');
return $result;
}
/**
* Returns the value of a given plugin global setting.
*
* @param string $name of the plugin
*
* @return string Value of the plugin
*/
public function get($name)
{
$settings = $this->get_settings();
foreach ($settings as $setting) {
if ($setting['variable'] == $this->get_name().'_'.$name) {
$unserialized = UnserializeApi::unserialize('not_allowed_classes', $setting['selected_value'], true);
if (!empty($setting['selected_value']) &&
false !== $unserialized
) {
$setting['selected_value'] = $unserialized;
}
return $setting['selected_value'];
}
}
return false;
}
/**
* Returns an array with the global settings for this plugin.
*
* @param bool $forceFromDB Optional. Force get settings from the database
*
* @return array Plugin settings as an array
*/
public function get_settings($forceFromDB = false)
{
if (empty($this->settings) || $forceFromDB) {
$settings = api_get_settings_params(
[
"subkey = ? AND category = ? AND type = ? AND access_url = ?" => [
$this->get_name(),
'Plugins',
'setting',
api_get_current_access_url_id(),
],
]
);
$this->settings = $settings;
}
return $this->settings;
}
/**
* Tells whether language variables are defined for this plugin or not.
*
* @param string $name System name of the plugin
*
* @return bool True if the plugin has language variables defined, false otherwise
*/
public function get_lang_plugin_exists($name)
{
return isset($this->strings[$name]);
}
/**
* Hook for the get_lang() function to check for plugin-defined language terms.
*
* @param string $name of the language variable we are looking for
*
* @return string The translated language term of the plugin
*/
public function get_lang($name)
{
// Check whether the language strings for the plugin have already been
// loaded. If so, no need to load them again.
if (is_null($this->strings)) {
$language_interface = api_get_interface_language();
$root = api_get_path(SYS_PLUGIN_PATH);
$plugin_name = $this->get_name();
$interfaceLanguageId = api_get_language_id($language_interface);
if (empty($interfaceLanguageId)) {
$language_interface = api_get_setting('platformLanguage');
$interfaceLanguageId = api_get_language_id($language_interface);
}
$interfaceLanguageInfo = api_get_language_info($interfaceLanguageId);
$languageParentId = !empty($interfaceLanguageInfo['parent_id']) ? (int) $interfaceLanguageInfo['parent_id'] : 0;
// 1. Loading english if exists
$english_path = $root.$plugin_name."/lang/english.php";
if (is_readable($english_path)) {
$strings = [];
include $english_path;
$this->strings = $strings;
}
$path = $root.$plugin_name."/lang/$language_interface.php";
// 2. Loading the system language
if (is_readable($path)) {
include $path;
if (!empty($strings)) {
foreach ($strings as $key => $string) {
$this->strings[$key] = $string;
}
}
} elseif ($languageParentId > 0) {
$languageParentInfo = api_get_language_info($languageParentId);
$languageParentFolder = $languageParentInfo['dokeos_folder'];
$parentPath = "{$root}{$plugin_name}/lang/{$languageParentFolder}.php";
if (is_readable($parentPath)) {
include $parentPath;
if (!empty($strings)) {
foreach ($strings as $key => $string) {
$this->strings[$key] = $string;
}
}
}
}
}
if (isset($this->strings[$name])) {
return $this->strings[$name];
}
return get_lang($name);
}
/**
* Caller for the install_course_fields() function.
*
* @param int $courseId
* @param bool $addToolLink Whether to add a tool link on the course homepage
*/
public function course_install($courseId, $addToolLink = true)
{
$this->install_course_fields($courseId, $addToolLink);
}
/**
* Add course settings and, if not asked otherwise, add a tool link on the course homepage.
*
* @param int $courseId Course integer ID
* @param bool $add_tool_link Whether to add a tool link or not
* (some tools might just offer a configuration section and act on the backend)
*
* @return bool|null False on error, null otherwise
*/
public function install_course_fields($courseId, $add_tool_link = true)
{
$plugin_name = $this->get_name();
$t_course = Database::get_course_table(TABLE_COURSE_SETTING);
$courseId = (int) $courseId;
if (empty($courseId)) {
return false;
}
// Adding course settings.
if (!empty($this->course_settings)) {
foreach ($this->course_settings as $setting) {
$variable = $setting['name'];
$value = '';
if (isset($setting['init_value'])) {
$value = $setting['init_value'];
}
$type = 'textfield';
if (isset($setting['type'])) {
$type = $setting['type'];
}
if (isset($setting['group'])) {
$group = $setting['group'];
$sql = "SELECT value
FROM $t_course
WHERE
c_id = $courseId AND
variable = '".Database::escape_string($group)."' AND
subkey = '".Database::escape_string($variable)."'
";
$result = Database::query($sql);
if (!Database::num_rows($result)) {
$params = [
'c_id' => $courseId,
'variable' => $group,
'subkey' => $variable,
'value' => $value,
'category' => 'plugins',
'type' => $type,
'title' => '',
];
Database::insert($t_course, $params);
}
} else {
$sql = "SELECT value FROM $t_course
WHERE c_id = $courseId AND variable = '$variable' ";
$result = Database::query($sql);
if (!Database::num_rows($result)) {
$params = [
'c_id' => $courseId,
'variable' => $variable,
'subkey' => $plugin_name,
'value' => $value,
'category' => 'plugins',
'type' => $type,
'title' => '',
];
Database::insert($t_course, $params);
}
}
}
}
// Stop here if we don't want a tool link on the course homepage
if (!$add_tool_link || $this->addCourseTool == false) {
return true;
}
// Add an icon in the table tool list
$this->createLinkToCourseTool($plugin_name, $courseId);
}
/**
* Delete the fields added to the course settings page and the link to the
* tool on the course's homepage.
*
* @param int $courseId
*
* @return false|null
*/
public function uninstall_course_fields($courseId)
{
$courseId = (int) $courseId;
if (empty($courseId)) {
return false;
}
$pluginName = $this->get_name();
$t_course = Database::get_course_table(TABLE_COURSE_SETTING);
$t_tool = Database::get_course_table(TABLE_TOOL_LIST);
if (!empty($this->course_settings)) {
foreach ($this->course_settings as $setting) {
$variable = Database::escape_string($setting['name']);
if (!empty($setting['group'])) {
$variable = Database::escape_string($setting['group']);
}
if (empty($variable)) {
continue;
}
$sql = "DELETE FROM $t_course
WHERE c_id = $courseId AND variable = '$variable'";
Database::query($sql);
}
}
$pluginName = Database::escape_string($pluginName);
$sql = "DELETE FROM $t_tool
WHERE c_id = $courseId AND
(
name = '$pluginName' OR
name = '$pluginName:student' OR
name = '$pluginName:teacher'
)";
Database::query($sql);
}
/**
* Install the course fields and tool link of this plugin in all courses.
*
* @param bool $add_tool_link Whether we want to add a plugin link on the course homepage
*/
public function install_course_fields_in_all_courses($add_tool_link = true)
{
// Update existing courses to add plugin settings
$table = Database::get_main_table(TABLE_MAIN_COURSE);
$sql = "SELECT id FROM $table ORDER BY id";
$res = Database::query($sql);
while ($row = Database::fetch_assoc($res)) {
$this->install_course_fields($row['id'], $add_tool_link);
}
}
/**
* Uninstall the plugin settings fields from all courses.
*/
public function uninstall_course_fields_in_all_courses()
{
// Update existing courses to add conference settings
$table = Database::get_main_table(TABLE_MAIN_COURSE);
$sql = "SELECT id FROM $table
ORDER BY id";
$res = Database::query($sql);
while ($row = Database::fetch_assoc($res)) {
$this->uninstall_course_fields($row['id']);
}
}
/**
* @return array
*/
public function getCourseSettings()
{
$settings = [];
if (is_array($this->course_settings)) {
foreach ($this->course_settings as $item) {
if (isset($item['group'])) {
if (!in_array($item['group'], $settings)) {
$settings[] = $item['group'];
}
} else {
$settings[] = $item['name'];
}
}
}
return $settings;
}
/**
* Method to be extended when changing the setting in the course
* configuration should trigger the use of a callback method.
*
* @param array $values sent back from the course configuration script
*/
public function course_settings_updated($values = [])
{
}
/**
* Add a tab to platform.
*
* @param string $tabName
* @param string $url
* @param string $userFilter Optional. Filter tab type
*
* @return false|string
*/
public function addTab($tabName, $url, $userFilter = null)
{
$sql = "SELECT * FROM settings_current
WHERE
variable = 'show_tabs' AND
subkey LIKE 'custom_tab_%'";
$result = Database::query($sql);
$customTabsNum = Database::num_rows($result);
$tabNum = $customTabsNum + 1;
// Avoid Tab Name Spaces
$tabNameNoSpaces = preg_replace('/\s+/', '', $tabName);
$subkeytext = "Tabs".$tabNameNoSpaces;
// Check if it is already added
$checkCondition = [
'where' => [
"variable = 'show_tabs' AND subkeytext = ?" => [
$subkeytext,
],
],
];
$checkDuplicate = Database::select('*', 'settings_current', $checkCondition);
if (!empty($checkDuplicate)) {
return false;
}
// End Check
$subkey = 'custom_tab_'.$tabNum;
if (!empty($userFilter)) {
switch ($userFilter) {
case self::TAB_FILTER_NO_STUDENT:
case self::TAB_FILTER_ONLY_STUDENT:
$subkey .= $userFilter;
break;
}
}
$currentUrlId = api_get_current_access_url_id();
$attributes = [
'variable' => 'show_tabs',
'subkey' => $subkey,
'type' => 'checkbox',
'category' => 'Platform',
'selected_value' => 'true',
'title' => $tabName,
'comment' => $url,
'subkeytext' => $subkeytext,
'access_url' => $currentUrlId,
'access_url_changeable' => 1,
'access_url_locked' => 0,
];
$resp = Database::insert('settings_current', $attributes);
// Save the id
$settings = $this->get_settings();
$setData = [
'comment' => $subkey,
];
$whereCondition = [
'id = ?' => key($settings),
];
Database::update('settings_current', $setData, $whereCondition);
return $resp;
}
/**
* Delete a tab to chamilo's platform.
*
* @param string $key
*
* @return bool $resp Transaction response
*/
public function deleteTab($key)
{
$table = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
$sql = "SELECT *
FROM $table
WHERE variable = 'show_tabs'
AND subkey <> '$key'
AND subkey like 'custom_tab_%'
";
$resp = $result = Database::query($sql);
$customTabsNum = Database::num_rows($result);
if (!empty($key)) {
$whereCondition = [
'variable = ? AND subkey = ?' => ['show_tabs', $key],
];
$resp = Database::delete('settings_current', $whereCondition);
//if there is more than one tab
//re enumerate them
if (!empty($customTabsNum) && $customTabsNum > 0) {
$tabs = Database::store_result($result, 'ASSOC');
$i = 1;
foreach ($tabs as $row) {
$newSubKey = "custom_tab_$i";
if (strpos($row['subkey'], self::TAB_FILTER_NO_STUDENT) !== false) {
$newSubKey .= self::TAB_FILTER_NO_STUDENT;
} elseif (strpos($row['subkey'], self::TAB_FILTER_ONLY_STUDENT) !== false) {
$newSubKey .= self::TAB_FILTER_ONLY_STUDENT;
}
$attributes = ['subkey' => $newSubKey];
$this->updateTab($row['subkey'], $attributes);
$i++;
}
}
}
return $resp;
}
/**
* Update the tabs attributes.
*
* @param string $key
* @param array $attributes
*
* @return bool
*/
public function updateTab($key, $attributes)
{
$whereCondition = [
'variable = ? AND subkey = ?' => ['show_tabs', $key],
];
$resp = Database::update('settings_current', $attributes, $whereCondition);
return $resp;
}
/**
* This method shows or hides plugin's tab.
*
* @param bool $showTab Shows or hides the main menu plugin tab
* @param string $filePath Plugin starter file path
*/
public function manageTab($showTab, $filePath = 'index.php')
{
$langString = str_replace('Plugin', '', get_class($this));
$pluginName = strtolower($langString);
$pluginUrl = 'plugin/'.$pluginName.'/'.$filePath;
if ($showTab === 'true') {
$tabAdded = $this->addTab($langString, $pluginUrl);
if ($tabAdded) {
// The page must be refreshed to show the recently created tab
echo "<script>location.href = '".Security::remove_XSS($_SERVER['REQUEST_URI'])."';</script>";
}
} else {
$settingsCurrentTable = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
$conditions = [
'where' => [
"variable = 'show_tabs' AND title = ? AND comment = ? " => [
$langString,
$pluginUrl,
],
],
];
$result = Database::select('subkey', $settingsCurrentTable, $conditions);
if (!empty($result)) {
$this->deleteTab($result[0]['subkey']);
}
}
}
/**
* @param string $variable
*
* @return bool
*/
public function validateCourseSetting($variable)
{
return true;
}
/**
* @param string $region
*
* @return string
*/
public function renderRegion($region)
{
return '';
}
/**
* Returns true if the plugin is installed, false otherwise.
*
* @return bool True if plugin is installed/enabled, false otherwise
*/
public function isEnabled()
{
$settings = api_get_settings_params_simple(
[
"subkey = ? AND category = ? AND type = ? AND variable = 'status' " => [
$this->get_name(),
'Plugins',
'setting',
],
]
);
if (is_array($settings) && isset($settings['selected_value']) && $settings['selected_value'] == 'installed') {
return true;
}
return false;
}
/**
* Allow make some actions after configure the plugin parameters
* This function is called from main/admin/configure_plugin.php page
* when saving the plugin parameters.
*
* @return \Plugin
*/
public function performActionsAfterConfigure()
{
return $this;
}
/**
* This function allows to change the visibility of the icon inside a course
* :student tool will be visible only for students
* :teacher tool will be visible only for teachers
* If nothing it's set then tool will be visible for both as a normal icon.
*
* @return string
*/
public function getToolIconVisibilityPerUserStatus()
{
return '';
}
/**
* Default tool icon visibility.
*
* @return bool
*/
public function isIconVisibleByDefault()
{
return true;
}
/**
* Get the admin URL for the plugin if Plugin::isAdminPlugin is true.
*
* @return string
*/
public function getAdminUrl()
{
if (!$this->isAdminPlugin) {
return '';
}
$name = $this->get_name();
$sysPath = api_get_path(SYS_PLUGIN_PATH).$name;
$webPath = api_get_path(WEB_PLUGIN_PATH).$name;
if (file_exists("$sysPath/admin.php")) {
return "$webPath/admin.php";
}
if (file_exists("$sysPath/start.php")) {
return "$webPath/start.php";
}
return '';
}
/**
* @param bool $value
*/
public function setHasPersonalEvents($value)
{
$this->hasPersonalEvents = $value;
}
/**
* Overwrite to perform some actions when deleting a user.
*
* @param int $userId
*/
public function doWhenDeletingUser($userId)
{
}
/**
* Overwrite to perform some actions when deleting a course.
*
* @param int $courseId
*/
public function doWhenDeletingCourse($courseId)
{
}
/**
* Overwrite to perform some actions when deleting a session.
*
* @param int $sessionId
*/
public function doWhenDeletingSession($sessionId)
{
}
/**
* Add an link for a course tool.
*
* @param string $name The tool name
* @param int $courseId The course ID
* @param string $iconName Optional. Icon file name
* @param string $link Optional. Link URL
*
* @return CTool|null
*/
protected function createLinkToCourseTool(
$name,
$courseId,
$iconName = null,
$link = null
) {
if (!$this->addCourseTool) {
return null;
}
$visibilityPerStatus = $this->getToolIconVisibilityPerUserStatus();
$visibility = $this->isIconVisibleByDefault();
$em = Database::getManager();
/** @var CTool $tool */
$tool = $em
->getRepository('ChamiloCourseBundle:CTool')
->findOneBy([
'name' => $name,
'course' => $courseId,
'category' => 'plugin',
]);
if (!$tool) {
$cToolId = AddCourse::generateToolId($courseId);
$pluginName = $this->get_name();
$tool = new CTool();
$tool
->setId($cToolId)
->setCourse(api_get_course_entity($courseId))
->setName($name.$visibilityPerStatus)
->setLink($link ?: "$pluginName/start.php")
->setImage($iconName ?: "$pluginName.png")
->setVisibility($visibility)
->setAdmin(0)
->setAddress('squaregrey.gif')
->setAddedTool(false)
->setTarget('_self')
->setCategory('plugin')
->setSessionId(0);
$em->persist($tool);
$em->flush();
}
return $tool;
}
}