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adminlib.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Functions and classes used during installation, upgrades and for admin settings.
*
* ADMIN SETTINGS TREE INTRODUCTION
*
* This file performs the following tasks:
* -it defines the necessary objects and interfaces to build the Moodle
* admin hierarchy
* -it defines the admin_externalpage_setup()
*
* ADMIN_SETTING OBJECTS
*
* Moodle settings are represented by objects that inherit from the admin_setting
* class. These objects encapsulate how to read a setting, how to write a new value
* to a setting, and how to appropriately display the HTML to modify the setting.
*
* ADMIN_SETTINGPAGE OBJECTS
*
* The admin_setting objects are then grouped into admin_settingpages. The latter
* appear in the Moodle admin tree block. All interaction with admin_settingpage
* objects is handled by the admin/settings.php file.
*
* ADMIN_EXTERNALPAGE OBJECTS
*
* There are some settings in Moodle that are too complex to (efficiently) handle
* with admin_settingpages. (Consider, for example, user management and displaying
* lists of users.) In this case, we use the admin_externalpage object. This object
* places a link to an external PHP file in the admin tree block.
*
* If you're using an admin_externalpage object for some settings, you can take
* advantage of the admin_externalpage_* functions. For example, suppose you wanted
* to add a foo.php file into admin. First off, you add the following line to
* admin/settings/first.php (at the end of the file) or to some other file in
* admin/settings:
* <code>
* $ADMIN->add('userinterface', new admin_externalpage('foo', get_string('foo'),
* $CFG->wwwdir . '/' . '$CFG->admin . '/foo.php', 'some_role_permission'));
* </code>
*
* Next, in foo.php, your file structure would resemble the following:
* <code>
* require(dirname(dirname(dirname(__FILE__))).'/config.php');
* require_once($CFG->libdir.'/adminlib.php');
* admin_externalpage_setup('foo');
* // functionality like processing form submissions goes here
* echo $OUTPUT->header();
* // your HTML goes here
* echo $OUTPUT->footer();
* </code>
*
* The admin_externalpage_setup() function call ensures the user is logged in,
* and makes sure that they have the proper role permission to access the page.
* It also configures all $PAGE properties needed for navigation.
*
* ADMIN_CATEGORY OBJECTS
*
* Above and beyond all this, we have admin_category objects. These objects
* appear as folders in the admin tree block. They contain admin_settingpage's,
* admin_externalpage's, and other admin_category's.
*
* OTHER NOTES
*
* admin_settingpage's, admin_externalpage's, and admin_category's all inherit
* from part_of_admin_tree (a pseudointerface). This interface insists that
* a class has a check_access method for access permissions, a locate method
* used to find a specific node in the admin tree and find parent path.
*
* admin_category's inherit from parentable_part_of_admin_tree. This pseudo-
* interface ensures that the class implements a recursive add function which
* accepts a part_of_admin_tree object and searches for the proper place to
* put it. parentable_part_of_admin_tree implies part_of_admin_tree.
*
* Please note that the $this->name field of any part_of_admin_tree must be
* UNIQUE throughout the ENTIRE admin tree.
*
* The $this->name field of an admin_setting object (which is *not* part_of_
* admin_tree) must be unique on the respective admin_settingpage where it is
* used.
*
* Original author: Vincenzo K. Marcovecchio
* Maintainer: Petr Skoda
*
* @package core
* @subpackage admin
* @copyright 1999 onwards Martin Dougiamas http://dougiamas.com
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/// Add libraries
require_once($CFG->libdir.'/ddllib.php');
require_once($CFG->libdir.'/xmlize.php');
require_once($CFG->libdir.'/messagelib.php');
define('INSECURE_DATAROOT_WARNING', 1);
define('INSECURE_DATAROOT_ERROR', 2);
/**
* Automatically clean-up all plugin data and remove the plugin DB tables
*
* @param string $type The plugin type, eg. 'mod', 'qtype', 'workshopgrading' etc.
* @param string $name The plugin name, eg. 'forum', 'multichoice', 'accumulative' etc.
* @uses global $OUTPUT to produce notices and other messages
* @return void
*/
function uninstall_plugin($type, $name) {
global $CFG, $DB, $OUTPUT;
// This may take a long time.
@set_time_limit(0);
// recursively uninstall all module/editor subplugins first
if ($type === 'mod' || $type === 'editor') {
$base = get_component_directory($type . '_' . $name);
if (file_exists("$base/db/subplugins.php")) {
$subplugins = array();
include("$base/db/subplugins.php");
foreach ($subplugins as $subplugintype=>$dir) {
$instances = get_plugin_list($subplugintype);
foreach ($instances as $subpluginname => $notusedpluginpath) {
uninstall_plugin($subplugintype, $subpluginname);
}
}
}
}
$component = $type . '_' . $name; // eg. 'qtype_multichoice' or 'workshopgrading_accumulative' or 'mod_forum'
if ($type === 'mod') {
$pluginname = $name; // eg. 'forum'
if (get_string_manager()->string_exists('modulename', $component)) {
$strpluginname = get_string('modulename', $component);
} else {
$strpluginname = $component;
}
} else {
$pluginname = $component;
if (get_string_manager()->string_exists('pluginname', $component)) {
$strpluginname = get_string('pluginname', $component);
} else {
$strpluginname = $component;
}
}
echo $OUTPUT->heading($pluginname);
$plugindirectory = get_plugin_directory($type, $name);
$uninstalllib = $plugindirectory . '/db/uninstall.php';
if (file_exists($uninstalllib)) {
require_once($uninstalllib);
$uninstallfunction = 'xmldb_' . $pluginname . '_uninstall'; // eg. 'xmldb_workshop_uninstall()'
if (function_exists($uninstallfunction)) {
if (!$uninstallfunction()) {
echo $OUTPUT->notification('Encountered a problem running uninstall function for '. $pluginname);
}
}
}
if ($type === 'mod') {
// perform cleanup tasks specific for activity modules
if (!$module = $DB->get_record('modules', array('name' => $name))) {
print_error('moduledoesnotexist', 'error');
}
// delete all the relevant instances from all course sections
if ($coursemods = $DB->get_records('course_modules', array('module' => $module->id))) {
foreach ($coursemods as $coursemod) {
if (!delete_mod_from_section($coursemod->id, $coursemod->section)) {
echo $OUTPUT->notification("Could not delete the $strpluginname with id = $coursemod->id from section $coursemod->section");
}
}
}
// clear course.modinfo for courses that used this module
$sql = "UPDATE {course}
SET modinfo=''
WHERE id IN (SELECT DISTINCT course
FROM {course_modules}
WHERE module=?)";
$DB->execute($sql, array($module->id));
// delete all the course module records
$DB->delete_records('course_modules', array('module' => $module->id));
// delete module contexts
if ($coursemods) {
foreach ($coursemods as $coursemod) {
if (!delete_context(CONTEXT_MODULE, $coursemod->id)) {
echo $OUTPUT->notification("Could not delete the context for $strpluginname with id = $coursemod->id");
}
}
}
// delete the module entry itself
$DB->delete_records('modules', array('name' => $module->name));
// cleanup the gradebook
require_once($CFG->libdir.'/gradelib.php');
grade_uninstalled_module($module->name);
// Perform any custom uninstall tasks
if (file_exists($CFG->dirroot . '/mod/' . $module->name . '/lib.php')) {
require_once($CFG->dirroot . '/mod/' . $module->name . '/lib.php');
$uninstallfunction = $module->name . '_uninstall';
if (function_exists($uninstallfunction)) {
debugging("{$uninstallfunction}() has been deprecated. Use the plugin's db/uninstall.php instead", DEBUG_DEVELOPER);
if (!$uninstallfunction()) {
echo $OUTPUT->notification('Encountered a problem running uninstall function for '. $module->name.'!');
}
}
}
} else if ($type === 'enrol') {
// NOTE: this is a bit brute force way - it will not trigger events and hooks properly
// nuke all role assignments
role_unassign_all(array('component'=>$component));
// purge participants
$DB->delete_records_select('user_enrolments', "enrolid IN (SELECT id FROM {enrol} WHERE enrol = ?)", array($name));
// purge enrol instances
$DB->delete_records('enrol', array('enrol'=>$name));
// tweak enrol settings
if (!empty($CFG->enrol_plugins_enabled)) {
$enabledenrols = explode(',', $CFG->enrol_plugins_enabled);
$enabledenrols = array_unique($enabledenrols);
$enabledenrols = array_flip($enabledenrols);
unset($enabledenrols[$name]);
$enabledenrols = array_flip($enabledenrols);
if (is_array($enabledenrols)) {
set_config('enrol_plugins_enabled', implode(',', $enabledenrols));
}
}
} else if ($type === 'block') {
if ($block = $DB->get_record('block', array('name'=>$name))) {
// Inform block it's about to be deleted
if (file_exists("$CFG->dirroot/blocks/$block->name/block_$block->name.php")) {
$blockobject = block_instance($block->name);
if ($blockobject) {
$blockobject->before_delete(); //only if we can create instance, block might have been already removed
}
}
// First delete instances and related contexts
$instances = $DB->get_records('block_instances', array('blockname' => $block->name));
foreach($instances as $instance) {
blocks_delete_instance($instance);
}
// Delete block
$DB->delete_records('block', array('id'=>$block->id));
}
} else if ($type === 'format') {
if (($defaultformat = get_config('moodlecourse', 'format')) && $defaultformat !== $name) {
$courses = $DB->get_records('course', array('format' => $name), 'id');
$data = (object)array('id' => null, 'format' => $defaultformat);
foreach ($courses as $record) {
$data->id = $record->id;
update_course($data);
}
}
$DB->delete_records('course_format_options', array('format' => $name));
}
// perform clean-up task common for all the plugin/subplugin types
//delete the web service functions and pre-built services
require_once($CFG->dirroot.'/lib/externallib.php');
external_delete_descriptions($component);
// delete calendar events
$DB->delete_records('event', array('modulename' => $pluginname));
// delete all the logs
$DB->delete_records('log', array('module' => $pluginname));
// delete log_display information
$DB->delete_records('log_display', array('component' => $component));
// delete the module configuration records
unset_all_config_for_plugin($pluginname);
// delete message provider
message_provider_uninstall($component);
// delete message processor
if ($type === 'message') {
message_processor_uninstall($name);
}
// delete the plugin tables
$xmldbfilepath = $plugindirectory . '/db/install.xml';
drop_plugin_tables($component, $xmldbfilepath, false);
if ($type === 'mod' or $type === 'block') {
// non-frankenstyle table prefixes
drop_plugin_tables($name, $xmldbfilepath, false);
}
// delete the capabilities that were defined by this module
capabilities_cleanup($component);
// remove event handlers and dequeue pending events
events_uninstall($component);
echo $OUTPUT->notification(get_string('success'), 'notifysuccess');
}
/**
* Returns the version of installed component
*
* @param string $component component name
* @param string $source either 'disk' or 'installed' - where to get the version information from
* @return string|bool version number or false if the component is not found
*/
function get_component_version($component, $source='installed') {
global $CFG, $DB;
list($type, $name) = normalize_component($component);
// moodle core or a core subsystem
if ($type === 'core') {
if ($source === 'installed') {
if (empty($CFG->version)) {
return false;
} else {
return $CFG->version;
}
} else {
if (!is_readable($CFG->dirroot.'/version.php')) {
return false;
} else {
$version = null; //initialize variable for IDEs
include($CFG->dirroot.'/version.php');
return $version;
}
}
}
// activity module
if ($type === 'mod') {
if ($source === 'installed') {
return $DB->get_field('modules', 'version', array('name'=>$name));
} else {
$mods = get_plugin_list('mod');
if (empty($mods[$name]) or !is_readable($mods[$name].'/version.php')) {
return false;
} else {
$module = new stdclass();
include($mods[$name].'/version.php');
return $module->version;
}
}
}
// block
if ($type === 'block') {
if ($source === 'installed') {
return $DB->get_field('block', 'version', array('name'=>$name));
} else {
$blocks = get_plugin_list('block');
if (empty($blocks[$name]) or !is_readable($blocks[$name].'/version.php')) {
return false;
} else {
$plugin = new stdclass();
include($blocks[$name].'/version.php');
return $plugin->version;
}
}
}
// all other plugin types
if ($source === 'installed') {
return get_config($type.'_'.$name, 'version');
} else {
$plugins = get_plugin_list($type);
if (empty($plugins[$name])) {
return false;
} else {
$plugin = new stdclass();
include($plugins[$name].'/version.php');
return $plugin->version;
}
}
}
/**
* Delete all plugin tables
*
* @param string $name Name of plugin, used as table prefix
* @param string $file Path to install.xml file
* @param bool $feedback defaults to true
* @return bool Always returns true
*/
function drop_plugin_tables($name, $file, $feedback=true) {
global $CFG, $DB;
// first try normal delete
if (file_exists($file) and $DB->get_manager()->delete_tables_from_xmldb_file($file)) {
return true;
}
// then try to find all tables that start with name and are not in any xml file
$used_tables = get_used_table_names();
$tables = $DB->get_tables();
/// Iterate over, fixing id fields as necessary
foreach ($tables as $table) {
if (in_array($table, $used_tables)) {
continue;
}
if (strpos($table, $name) !== 0) {
continue;
}
// found orphan table --> delete it
if ($DB->get_manager()->table_exists($table)) {
$xmldb_table = new xmldb_table($table);
$DB->get_manager()->drop_table($xmldb_table);
}
}
return true;
}
/**
* Returns names of all known tables == tables that moodle knows about.
*
* @return array Array of lowercase table names
*/
function get_used_table_names() {
$table_names = array();
$dbdirs = get_db_directories();
foreach ($dbdirs as $dbdir) {
$file = $dbdir.'/install.xml';
$xmldb_file = new xmldb_file($file);
if (!$xmldb_file->fileExists()) {
continue;
}
$loaded = $xmldb_file->loadXMLStructure();
$structure = $xmldb_file->getStructure();
if ($loaded and $tables = $structure->getTables()) {
foreach($tables as $table) {
$table_names[] = strtolower($table->getName());
}
}
}
return $table_names;
}
/**
* Returns list of all directories where we expect install.xml files
* @return array Array of paths
*/
function get_db_directories() {
global $CFG;
$dbdirs = array();
/// First, the main one (lib/db)
$dbdirs[] = $CFG->libdir.'/db';
/// Then, all the ones defined by get_plugin_types()
$plugintypes = get_plugin_types();
foreach ($plugintypes as $plugintype => $pluginbasedir) {
if ($plugins = get_plugin_list($plugintype)) {
foreach ($plugins as $plugin => $plugindir) {
$dbdirs[] = $plugindir.'/db';
}
}
}
return $dbdirs;
}
/**
* Try to obtain or release the cron lock.
* @param string $name name of lock
* @param int $until timestamp when this lock considered stale, null means remove lock unconditionally
* @param bool $ignorecurrent ignore current lock state, usually extend previous lock, defaults to false
* @return bool true if lock obtained
*/
function set_cron_lock($name, $until, $ignorecurrent=false) {
global $DB;
if (empty($name)) {
debugging("Tried to get a cron lock for a null fieldname");
return false;
}
// remove lock by force == remove from config table
if (is_null($until)) {
set_config($name, null);
return true;
}
if (!$ignorecurrent) {
// read value from db - other processes might have changed it
$value = $DB->get_field('config', 'value', array('name'=>$name));
if ($value and $value > time()) {
//lock active
return false;
}
}
set_config($name, $until);
return true;
}
/**
* Test if and critical warnings are present
* @return bool
*/
function admin_critical_warnings_present() {
global $SESSION;
if (!has_capability('moodle/site:config', context_system::instance())) {
return 0;
}
if (!isset($SESSION->admin_critical_warning)) {
$SESSION->admin_critical_warning = 0;
if (is_dataroot_insecure(true) === INSECURE_DATAROOT_ERROR) {
$SESSION->admin_critical_warning = 1;
}
}
return $SESSION->admin_critical_warning;
}
/**
* Detects if float supports at least 10 decimal digits
*
* Detects if float supports at least 10 decimal digits
* and also if float-->string conversion works as expected.
*
* @return bool true if problem found
*/
function is_float_problem() {
$num1 = 2009010200.01;
$num2 = 2009010200.02;
return ((string)$num1 === (string)$num2 or $num1 === $num2 or $num2 <= (string)$num1);
}
/**
* Try to verify that dataroot is not accessible from web.
*
* Try to verify that dataroot is not accessible from web.
* It is not 100% correct but might help to reduce number of vulnerable sites.
* Protection from httpd.conf and .htaccess is not detected properly.
*
* @uses INSECURE_DATAROOT_WARNING
* @uses INSECURE_DATAROOT_ERROR
* @param bool $fetchtest try to test public access by fetching file, default false
* @return mixed empty means secure, INSECURE_DATAROOT_ERROR found a critical problem, INSECURE_DATAROOT_WARNING might be problematic
*/
function is_dataroot_insecure($fetchtest=false) {
global $CFG;
$siteroot = str_replace('\\', '/', strrev($CFG->dirroot.'/')); // win32 backslash workaround
$rp = preg_replace('|https?://[^/]+|i', '', $CFG->wwwroot, 1);
$rp = strrev(trim($rp, '/'));
$rp = explode('/', $rp);
foreach($rp as $r) {
if (strpos($siteroot, '/'.$r.'/') === 0) {
$siteroot = substr($siteroot, strlen($r)+1); // moodle web in subdirectory
} else {
break; // probably alias root
}
}
$siteroot = strrev($siteroot);
$dataroot = str_replace('\\', '/', $CFG->dataroot.'/');
if (strpos($dataroot, $siteroot) !== 0) {
return false;
}
if (!$fetchtest) {
return INSECURE_DATAROOT_WARNING;
}
// now try all methods to fetch a test file using http protocol
$httpdocroot = str_replace('\\', '/', strrev($CFG->dirroot.'/'));
preg_match('|(https?://[^/]+)|i', $CFG->wwwroot, $matches);
$httpdocroot = $matches[1];
$datarooturl = $httpdocroot.'/'. substr($dataroot, strlen($siteroot));
make_upload_directory('diag');
$testfile = $CFG->dataroot.'/diag/public.txt';
if (!file_exists($testfile)) {
file_put_contents($testfile, 'test file, do not delete');
}
$teststr = trim(file_get_contents($testfile));
if (empty($teststr)) {
// hmm, strange
return INSECURE_DATAROOT_WARNING;
}
$testurl = $datarooturl.'/diag/public.txt';
if (extension_loaded('curl') and
!(stripos(ini_get('disable_functions'), 'curl_init') !== FALSE) and
!(stripos(ini_get('disable_functions'), 'curl_setop') !== FALSE) and
($ch = @curl_init($testurl)) !== false) {
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, false);
$data = curl_exec($ch);
if (!curl_errno($ch)) {
$data = trim($data);
if ($data === $teststr) {
curl_close($ch);
return INSECURE_DATAROOT_ERROR;
}
}
curl_close($ch);
}
if ($data = @file_get_contents($testurl)) {
$data = trim($data);
if ($data === $teststr) {
return INSECURE_DATAROOT_ERROR;
}
}
preg_match('|https?://([^/]+)|i', $testurl, $matches);
$sitename = $matches[1];
$error = 0;
if ($fp = @fsockopen($sitename, 80, $error)) {
preg_match('|https?://[^/]+(.*)|i', $testurl, $matches);
$localurl = $matches[1];
$out = "GET $localurl HTTP/1.1\r\n";
$out .= "Host: $sitename\r\n";
$out .= "Connection: Close\r\n\r\n";
fwrite($fp, $out);
$data = '';
$incoming = false;
while (!feof($fp)) {
if ($incoming) {
$data .= fgets($fp, 1024);
} else if (@fgets($fp, 1024) === "\r\n") {
$incoming = true;
}
}
fclose($fp);
$data = trim($data);
if ($data === $teststr) {
return INSECURE_DATAROOT_ERROR;
}
}
return INSECURE_DATAROOT_WARNING;
}
/**
* Enables CLI maintenance mode by creating new dataroot/climaintenance.html file.
*/
function enable_cli_maintenance_mode() {
global $CFG;
if (file_exists("$CFG->dataroot/climaintenance.html")) {
unlink("$CFG->dataroot/climaintenance.html");
}
if (isset($CFG->maintenance_message) and !html_is_blank($CFG->maintenance_message)) {
$data = $CFG->maintenance_message;
$data = bootstrap_renderer::early_error_content($data, null, null, null);
$data = bootstrap_renderer::plain_page(get_string('sitemaintenance', 'admin'), $data);
} else if (file_exists("$CFG->dataroot/climaintenance.template.html")) {
$data = file_get_contents("$CFG->dataroot/climaintenance.template.html");
} else {
$data = get_string('sitemaintenance', 'admin');
$data = bootstrap_renderer::early_error_content($data, null, null, null);
$data = bootstrap_renderer::plain_page(get_string('sitemaintenance', 'admin'), $data);
}
file_put_contents("$CFG->dataroot/climaintenance.html", $data);
chmod("$CFG->dataroot/climaintenance.html", $CFG->filepermissions);
}
/// CLASS DEFINITIONS /////////////////////////////////////////////////////////
/**
* Interface for anything appearing in the admin tree
*
* The interface that is implemented by anything that appears in the admin tree
* block. It forces inheriting classes to define a method for checking user permissions
* and methods for finding something in the admin tree.
*
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
interface part_of_admin_tree {
/**
* Finds a named part_of_admin_tree.
*
* Used to find a part_of_admin_tree. If a class only inherits part_of_admin_tree
* and not parentable_part_of_admin_tree, then this function should only check if
* $this->name matches $name. If it does, it should return a reference to $this,
* otherwise, it should return a reference to NULL.
*
* If a class inherits parentable_part_of_admin_tree, this method should be called
* recursively on all child objects (assuming, of course, the parent object's name
* doesn't match the search criterion).
*
* @param string $name The internal name of the part_of_admin_tree we're searching for.
* @return mixed An object reference or a NULL reference.
*/
public function locate($name);
/**
* Removes named part_of_admin_tree.
*
* @param string $name The internal name of the part_of_admin_tree we want to remove.
* @return bool success.
*/
public function prune($name);
/**
* Search using query
* @param string $query
* @return mixed array-object structure of found settings and pages
*/
public function search($query);
/**
* Verifies current user's access to this part_of_admin_tree.
*
* Used to check if the current user has access to this part of the admin tree or
* not. If a class only inherits part_of_admin_tree and not parentable_part_of_admin_tree,
* then this method is usually just a call to has_capability() in the site context.
*
* If a class inherits parentable_part_of_admin_tree, this method should return the
* logical OR of the return of check_access() on all child objects.
*
* @return bool True if the user has access, false if she doesn't.
*/
public function check_access();
/**
* Mostly useful for removing of some parts of the tree in admin tree block.
*
* @return True is hidden from normal list view
*/
public function is_hidden();
/**
* Show we display Save button at the page bottom?
* @return bool
*/
public function show_save();
}
/**
* Interface implemented by any part_of_admin_tree that has children.
*
* The interface implemented by any part_of_admin_tree that can be a parent
* to other part_of_admin_tree's. (For now, this only includes admin_category.) Apart
* from ensuring part_of_admin_tree compliancy, it also ensures inheriting methods
* include an add method for adding other part_of_admin_tree objects as children.
*
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
interface parentable_part_of_admin_tree extends part_of_admin_tree {
/**
* Adds a part_of_admin_tree object to the admin tree.
*
* Used to add a part_of_admin_tree object to this object or a child of this
* object. $something should only be added if $destinationname matches
* $this->name. If it doesn't, add should be called on child objects that are
* also parentable_part_of_admin_tree's.
*
* @param string $destinationname The internal name of the new parent for $something.
* @param part_of_admin_tree $something The object to be added.
* @return bool True on success, false on failure.
*/
public function add($destinationname, $something);
}
/**
* The object used to represent folders (a.k.a. categories) in the admin tree block.
*
* Each admin_category object contains a number of part_of_admin_tree objects.
*
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class admin_category implements parentable_part_of_admin_tree {
/** @var mixed An array of part_of_admin_tree objects that are this object's children */
public $children;
/** @var string An internal name for this category. Must be unique amongst ALL part_of_admin_tree objects */
public $name;
/** @var string The displayed name for this category. Usually obtained through get_string() */
public $visiblename;
/** @var bool Should this category be hidden in admin tree block? */
public $hidden;
/** @var mixed Either a string or an array or strings */
public $path;
/** @var mixed Either a string or an array or strings */
public $visiblepath;
/** @var array fast lookup category cache, all categories of one tree point to one cache */
protected $category_cache;
/**
* Constructor for an empty admin category
*
* @param string $name The internal name for this category. Must be unique amongst ALL part_of_admin_tree objects
* @param string $visiblename The displayed named for this category. Usually obtained through get_string()
* @param bool $hidden hide category in admin tree block, defaults to false
*/
public function __construct($name, $visiblename, $hidden=false) {
$this->children = array();
$this->name = $name;
$this->visiblename = $visiblename;
$this->hidden = $hidden;
}
/**
* Returns a reference to the part_of_admin_tree object with internal name $name.
*
* @param string $name The internal name of the object we want.
* @param bool $findpath initialize path and visiblepath arrays
* @return mixed A reference to the object with internal name $name if found, otherwise a reference to NULL.
* defaults to false
*/
public function locate($name, $findpath=false) {
if (is_array($this->category_cache) and !isset($this->category_cache[$this->name])) {
// somebody much have purged the cache
$this->category_cache[$this->name] = $this;
}
if ($this->name == $name) {
if ($findpath) {
$this->visiblepath[] = $this->visiblename;
$this->path[] = $this->name;
}
return $this;
}
// quick category lookup
if (!$findpath and is_array($this->category_cache) and isset($this->category_cache[$name])) {
return $this->category_cache[$name];
}
$return = NULL;
foreach($this->children as $childid=>$unused) {
if ($return = $this->children[$childid]->locate($name, $findpath)) {
break;
}
}
if (!is_null($return) and $findpath) {
$return->visiblepath[] = $this->visiblename;
$return->path[] = $this->name;
}
return $return;
}
/**
* Search using query
*
* @param string query
* @return mixed array-object structure of found settings and pages
*/
public function search($query) {
$result = array();
foreach ($this->children as $child) {
$subsearch = $child->search($query);
if (!is_array($subsearch)) {
debugging('Incorrect search result from '.$child->name);
continue;
}
$result = array_merge($result, $subsearch);
}
return $result;
}
/**
* Removes part_of_admin_tree object with internal name $name.
*
* @param string $name The internal name of the object we want to remove.
* @return bool success
*/
public function prune($name) {
if ($this->name == $name) {
return false; //can not remove itself
}
foreach($this->children as $precedence => $child) {
if ($child->name == $name) {
// clear cache and delete self
if (is_array($this->category_cache)) {
while($this->category_cache) {
// delete the cache, but keep the original array address
array_pop($this->category_cache);
}
}
unset($this->children[$precedence]);
return true;
} else if ($this->children[$precedence]->prune($name)) {
return true;
}
}
return false;
}
/**
* Adds a part_of_admin_tree to a child or grandchild (or great-grandchild, and so forth) of this object.
*
* @param string $destinationame The internal name of the immediate parent that we want for $something.
* @param mixed $something A part_of_admin_tree or setting instance to be added.
* @return bool True if successfully added, false if $something can not be added.
*/
public function add($parentname, $something) {
$parent = $this->locate($parentname);
if (is_null($parent)) {
debugging('parent does not exist!');
return false;
}
if ($something instanceof part_of_admin_tree) {
if (!($parent instanceof parentable_part_of_admin_tree)) {
debugging('error - parts of tree can be inserted only into parentable parts');
return false;
}
if (debugging('', DEBUG_DEVELOPER) && !is_null($this->locate($something->name))) {
// The name of the node is already used, simply warn the developer that this should not happen.
// It is intentional to check for the debug level before performing the check.
debugging('Duplicate admin page name: ' . $something->name, DEBUG_DEVELOPER);
}
$parent->children[] = $something;
if (is_array($this->category_cache) and ($something instanceof admin_category)) {
if (isset($this->category_cache[$something->name])) {
debugging('Duplicate admin category name: '.$something->name);
} else {
$this->category_cache[$something->name] = $something;
$something->category_cache =& $this->category_cache;
foreach ($something->children as $child) {
// just in case somebody already added subcategories
if ($child instanceof admin_category) {
if (isset($this->category_cache[$child->name])) {
debugging('Duplicate admin category name: '.$child->name);
} else {
$this->category_cache[$child->name] = $child;
$child->category_cache =& $this->category_cache;
}
}
}
}
}
return true;
} else {
debugging('error - can not add this element');
return false;
}
}
/**
* Checks if the user has access to anything in this category.
*
* @return bool True if the user has access to at least one child in this category, false otherwise.