/lib/upgradelib.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/>.

/**
 * Various upgrade/install related functions and classes.
 *
 * @package    core
 * @subpackage upgrade
 * @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();

/** UPGRADE_LOG_NORMAL = 0 */
define('UPGRADE_LOG_NORMAL', 0);
/** UPGRADE_LOG_NOTICE = 1 */
define('UPGRADE_LOG_NOTICE', 1);
/** UPGRADE_LOG_ERROR = 2 */
define('UPGRADE_LOG_ERROR',  2);

/**
 * Exception indicating unknown error during upgrade.
 *
 * @package    core
 * @subpackage upgrade
 * @copyright  2009 Petr Skoda {@link http://skodak.org}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class upgrade_exception extends moodle_exception {
    function __construct($plugin, $version, $debuginfo=NULL) {
        global $CFG;
        $a = (object)array('plugin'=>$plugin, 'version'=>$version);
        parent::__construct('upgradeerror', 'admin', "$CFG->wwwroot/$CFG->admin/index.php", $a, $debuginfo);
    }
}

/**
 * Exception indicating downgrade error during upgrade.
 *
 * @package    core
 * @subpackage upgrade
 * @copyright  2009 Petr Skoda {@link http://skodak.org}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class downgrade_exception extends moodle_exception {
    function __construct($plugin, $oldversion, $newversion) {
        global $CFG;
        $plugin = is_null($plugin) ? 'moodle' : $plugin;
        $a = (object)array('plugin'=>$plugin, 'oldversion'=>$oldversion, 'newversion'=>$newversion);
        parent::__construct('cannotdowngrade', 'debug', "$CFG->wwwroot/$CFG->admin/index.php", $a);
    }
}

/**
 * @package    core
 * @subpackage upgrade
 * @copyright  2009 Petr Skoda {@link http://skodak.org}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class upgrade_requires_exception extends moodle_exception {
    function __construct($plugin, $pluginversion, $currentmoodle, $requiremoodle) {
        global $CFG;
        $a = new stdClass();
        $a->pluginname     = $plugin;
        $a->pluginversion  = $pluginversion;
        $a->currentmoodle  = $currentmoodle;
        $a->requiremoodle  = $requiremoodle;
        parent::__construct('pluginrequirementsnotmet', 'error', "$CFG->wwwroot/$CFG->admin/index.php", $a);
    }
}

/**
 * Exception thrown when attempting to install a plugin that declares incompatibility with moodle version
 *
 * @package    core
 * @subpackage upgrade
 * @copyright  2019 Peter Burnett <peterburnett@catalyst-au.net>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class plugin_incompatible_exception extends moodle_exception {
    /**
     * Constructor function for exception
     *
     * @param \core\plugininfo\base $plugin The plugin causing the exception
     * @param int $pluginversion The version of the plugin causing the exception
     */
    public function __construct($plugin, $pluginversion) {
        global $CFG;
        $a = new stdClass();
        $a->pluginname      = $plugin;
        $a->pluginversion   = $pluginversion;
        $a->moodleversion   = $CFG->branch;

        parent::__construct('pluginunsupported', 'error', "$CFG->wwwroot/$CFG->admin/index.php", $a);
    }
}

/**
 * @package    core
 * @subpackage upgrade
 * @copyright  2009 Petr Skoda {@link http://skodak.org}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class plugin_defective_exception extends moodle_exception {
    function __construct($plugin, $details) {
        global $CFG;
        parent::__construct('detectedbrokenplugin', 'error', "$CFG->wwwroot/$CFG->admin/index.php", $plugin, $details);
    }
}

/**
 * Misplaced plugin exception.
 *
 * Note: this should be used only from the upgrade/admin code.
 *
 * @package    core
 * @subpackage upgrade
 * @copyright  2009 Petr Skoda {@link http://skodak.org}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class plugin_misplaced_exception extends moodle_exception {
    /**
     * Constructor.
     * @param string $component the component from version.php
     * @param string $expected expected directory, null means calculate
     * @param string $current plugin directory path
     */
    public function __construct($component, $expected, $current) {
        global $CFG;
        if (empty($expected)) {
            list($type, $plugin) = core_component::normalize_component($component);
            $plugintypes = core_component::get_plugin_types();
            if (isset($plugintypes[$type])) {
                $expected = $plugintypes[$type] . '/' . $plugin;
            }
        }
        if (strpos($expected, '$CFG->dirroot') !== 0) {
            $expected = str_replace($CFG->dirroot, '$CFG->dirroot', $expected);
        }
        if (strpos($current, '$CFG->dirroot') !== 0) {
            $current = str_replace($CFG->dirroot, '$CFG->dirroot', $current);
        }
        $a = new stdClass();
        $a->component = $component;
        $a->expected  = $expected;
        $a->current   = $current;
        parent::__construct('detectedmisplacedplugin', 'core_plugin', "$CFG->wwwroot/$CFG->admin/index.php", $a);
    }
}

/**
 * Static class monitors performance of upgrade steps.
 */
class core_upgrade_time {
    /** @var float Time at start of current upgrade (plugin/system) */
    protected static $before;
    /** @var float Time at end of last savepoint */
    protected static $lastsavepoint;
    /** @var bool Flag to indicate whether we are recording timestamps or not. */
    protected static $isrecording = false;

    /**
     * Records current time at the start of the current upgrade item, e.g. plugin.
     */
    public static function record_start() {
        self::$before = microtime(true);
        self::$lastsavepoint = self::$before;
        self::$isrecording = true;
    }

    /**
     * Records current time at the end of a given numbered step.
     *
     * @param float $version Version number (may have decimals, or not)
     */
    public static function record_savepoint($version) {
        global $CFG, $OUTPUT;

        // In developer debug mode we show a notification after each individual save point.
        if ($CFG->debugdeveloper && self::$isrecording) {
            $time = microtime(true);

            $notification = new \core\output\notification($version . ': ' .
                    get_string('successduration', '', format_float($time - self::$lastsavepoint, 2)),
                    \core\output\notification::NOTIFY_SUCCESS);
            $notification->set_show_closebutton(false);
            echo $OUTPUT->render($notification);
            self::$lastsavepoint = $time;
        }
    }

    /**
     * Gets the time since the record_start function was called, rounded to 2 digits.
     *
     * @return float Elapsed time
     */
    public static function get_elapsed() {
        return microtime(true) - self::$before;
    }
}

/**
 * Sets maximum expected time needed for upgrade task.
 * Please always make sure that upgrade will not run longer!
 *
 * The script may be automatically aborted if upgrade times out.
 *
 * @category upgrade
 * @param int $max_execution_time in seconds (can not be less than 60 s)
 */
function upgrade_set_timeout($max_execution_time=300) {
    global $CFG;

    if (!isset($CFG->upgraderunning) or $CFG->upgraderunning < time()) {
        $upgraderunning = get_config(null, 'upgraderunning');
    } else {
        $upgraderunning = $CFG->upgraderunning;
    }

    if (!$upgraderunning) {
        if (CLI_SCRIPT) {
            // never stop CLI upgrades
            $upgraderunning = 0;
        } else {
            // web upgrade not running or aborted
            print_error('upgradetimedout', 'admin', "$CFG->wwwroot/$CFG->admin/");
        }
    }

    if ($max_execution_time < 60) {
        // protection against 0 here
        $max_execution_time = 60;
    }

    $expected_end = time() + $max_execution_time;

    if ($expected_end < $upgraderunning + 10 and $expected_end > $upgraderunning - 10) {
        // no need to store new end, it is nearly the same ;-)
        return;
    }

    if (CLI_SCRIPT) {
        // there is no point in timing out of CLI scripts, admins can stop them if necessary
        core_php_time_limit::raise();
    } else {
        core_php_time_limit::raise($max_execution_time);
    }
    set_config('upgraderunning', $expected_end); // keep upgrade locked until this time
}

/**
 * Upgrade savepoint, marks end of each upgrade block.
 * It stores new main version, resets upgrade timeout
 * and abort upgrade if user cancels page loading.
 *
 * Please do not make large upgrade blocks with lots of operations,
 * for example when adding tables keep only one table operation per block.
 *
 * @category upgrade
 * @param bool $result false if upgrade step failed, true if completed
 * @param string or float $version main version
 * @param bool $allowabort allow user to abort script execution here
 * @return void
 */
function upgrade_main_savepoint($result, $version, $allowabort=true) {
    global $CFG;

    //sanity check to avoid confusion with upgrade_mod_savepoint usage.
    if (!is_bool($allowabort)) {
        $errormessage = 'Parameter type mismatch. Are you mixing up upgrade_main_savepoint() and upgrade_mod_savepoint()?';
        throw new coding_exception($errormessage);
    }

    if (!$result) {
        throw new upgrade_exception(null, $version);
    }

    if ($CFG->version >= $version) {
        // something really wrong is going on in main upgrade script
        throw new downgrade_exception(null, $CFG->version, $version);
    }

    set_config('version', $version);
    upgrade_log(UPGRADE_LOG_NORMAL, null, 'Upgrade savepoint reached');

    // reset upgrade timeout to default
    upgrade_set_timeout();

    core_upgrade_time::record_savepoint($version);

    // this is a safe place to stop upgrades if user aborts page loading
    if ($allowabort and connection_aborted()) {
        die;
    }
}

/**
 * Module upgrade savepoint, marks end of module upgrade blocks
 * It stores module version, resets upgrade timeout
 * and abort upgrade if user cancels page loading.
 *
 * @category upgrade
 * @param bool $result false if upgrade step failed, true if completed
 * @param string or float $version main version
 * @param string $modname name of module
 * @param bool $allowabort allow user to abort script execution here
 * @return void
 */
function upgrade_mod_savepoint($result, $version, $modname, $allowabort=true) {
    global $DB;

    $component = 'mod_'.$modname;

    if (!$result) {
        throw new upgrade_exception($component, $version);
    }

    $dbversion = $DB->get_field('config_plugins', 'value', array('plugin'=>$component, 'name'=>'version'));

    if (!$module = $DB->get_record('modules', array('name'=>$modname))) {
        print_error('modulenotexist', 'debug', '', $modname);
    }

    if ($dbversion >= $version) {
        // something really wrong is going on in upgrade script
        throw new downgrade_exception($component, $dbversion, $version);
    }
    set_config('version', $version, $component);

    upgrade_log(UPGRADE_LOG_NORMAL, $component, 'Upgrade savepoint reached');

    // reset upgrade timeout to default
    upgrade_set_timeout();

    core_upgrade_time::record_savepoint($version);

    // this is a safe place to stop upgrades if user aborts page loading
    if ($allowabort and connection_aborted()) {
        die;
    }
}

/**
 * Blocks upgrade savepoint, marks end of blocks upgrade blocks
 * It stores block version, resets upgrade timeout
 * and abort upgrade if user cancels page loading.
 *
 * @category upgrade
 * @param bool $result false if upgrade step failed, true if completed
 * @param string or float $version main version
 * @param string $blockname name of block
 * @param bool $allowabort allow user to abort script execution here
 * @return void
 */
function upgrade_block_savepoint($result, $version, $blockname, $allowabort=true) {
    global $DB;

    $component = 'block_'.$blockname;

    if (!$result) {
        throw new upgrade_exception($component, $version);
    }

    $dbversion = $DB->get_field('config_plugins', 'value', array('plugin'=>$component, 'name'=>'version'));

    if (!$block = $DB->get_record('block', array('name'=>$blockname))) {
        print_error('blocknotexist', 'debug', '', $blockname);
    }

    if ($dbversion >= $version) {
        // something really wrong is going on in upgrade script
        throw new downgrade_exception($component, $dbversion, $version);
    }
    set_config('version', $version, $component);

    upgrade_log(UPGRADE_LOG_NORMAL, $component, 'Upgrade savepoint reached');

    // reset upgrade timeout to default
    upgrade_set_timeout();

    core_upgrade_time::record_savepoint($version);

    // this is a safe place to stop upgrades if user aborts page loading
    if ($allowabort and connection_aborted()) {
        die;
    }
}

/**
 * Plugins upgrade savepoint, marks end of blocks upgrade blocks
 * It stores plugin version, resets upgrade timeout
 * and abort upgrade if user cancels page loading.
 *
 * @category upgrade
 * @param bool $result false if upgrade step failed, true if completed
 * @param string or float $version main version
 * @param string $type The type of the plugin.
 * @param string $plugin The name of the plugin.
 * @param bool $allowabort allow user to abort script execution here
 * @return void
 */
function upgrade_plugin_savepoint($result, $version, $type, $plugin, $allowabort=true) {
    global $DB;

    $component = $type.'_'.$plugin;

    if (!$result) {
        throw new upgrade_exception($component, $version);
    }

    $dbversion = $DB->get_field('config_plugins', 'value', array('plugin'=>$component, 'name'=>'version'));

    if ($dbversion >= $version) {
        // Something really wrong is going on in the upgrade script
        throw new downgrade_exception($component, $dbversion, $version);
    }
    set_config('version', $version, $component);
    upgrade_log(UPGRADE_LOG_NORMAL, $component, 'Upgrade savepoint reached');

    // Reset upgrade timeout to default
    upgrade_set_timeout();

    core_upgrade_time::record_savepoint($version);

    // This is a safe place to stop upgrades if user aborts page loading
    if ($allowabort and connection_aborted()) {
        die;
    }
}

/**
 * Detect if there are leftovers in PHP source files.
 *
 * During main version upgrades administrators MUST move away
 * old PHP source files and start from scratch (or better
 * use git).
 *
 * @return bool true means borked upgrade, false means previous PHP files were properly removed
 */
function upgrade_stale_php_files_present(): bool {
    global $CFG;

    $someexamplesofremovedfiles = [
        // Removed in 4.0.
        '/admin/classes/task_log_table.php',
        '/admin/cli/mysql_engine.php',
        '/lib/babel-polyfill/polyfill.js',
        '/lib/typo3/class.t3lib_cs.php',
        '/question/tests/category_class_test.php',
        // Removed in 3.11.
        '/customfield/edit.php',
        '/lib/phpunit/classes/autoloader.php',
        '/lib/xhprof/README',
        '/message/defaultoutputs.php',
        '/user/files_form.php',
        // Removed in 3.10.
        '/grade/grading/classes/privacy/gradingform_provider.php',
        '/lib/coursecatlib.php',
        '/lib/form/htmleditor.php',
        '/message/classes/output/messagearea/contact.php',
        // Removed in 3.9.
        '/course/classes/output/modchooser_item.php',
        '/course/yui/build/moodle-course-modchooser/moodle-course-modchooser-min.js',
        '/course/yui/src/modchooser/js/modchooser.js',
        '/h5p/classes/autoloader.php',
        '/lib/adodb/readme.txt',
        '/lib/maxmind/GeoIp2/Compat/JsonSerializable.php',
        // Removed in 3.8.
        '/lib/amd/src/modal_confirm.js',
        '/lib/fonts/font-awesome-4.7.0/css/font-awesome.css',
        '/lib/jquery/jquery-3.2.1.min.js',
        '/lib/recaptchalib.php',
        '/lib/sessionkeepalive_ajax.php',
        '/lib/yui/src/checknet/js/checknet.js',
        '/question/amd/src/qbankmanager.js',
        // Removed in 3.7.
        '/lib/form/yui/src/showadvanced/js/showadvanced.js',
        '/lib/tests/output_external_test.php',
        '/message/amd/src/message_area.js',
        '/message/templates/message_area.mustache',
        '/question/yui/src/qbankmanager/build.json',
        // Removed in 3.6.
        '/lib/classes/session/memcache.php',
        '/lib/eventslib.php',
        '/lib/form/submitlink.php',
        '/lib/medialib.php',
        '/lib/password_compat/lib/password.php',
        // Removed in 3.5.
        '/lib/dml/mssql_native_moodle_database.php',
        '/lib/dml/mssql_native_moodle_recordset.php',
        '/lib/dml/mssql_native_moodle_temptables.php',
        // Removed in 3.4.
        '/auth/README.txt',
        '/calendar/set.php',
        '/enrol/users.php',
        '/enrol/yui/rolemanager/assets/skins/sam/rolemanager.css',
        // Removed in 3.3.
        '/badges/backpackconnect.php',
        '/calendar/yui/src/info/assets/skins/sam/moodle-calendar-info.css',
        '/competency/classes/external/exporter.php',
        '/mod/forum/forum.js',
        '/user/pixgroup.php',
        // Removed in 3.2.
        '/calendar/preferences.php',
        '/lib/alfresco/',
        '/lib/jquery/jquery-1.12.1.min.js',
        '/lib/password_compat/tests/',
        '/lib/phpunit/classes/unittestcase.php',
        // Removed in 3.1.
        '/lib/classes/log/sql_internal_reader.php',
        '/lib/zend/',
        '/mod/forum/pix/icon.gif',
        '/tag/templates/tagname.mustache',
        // Removed in 3.0.
        '/mod/lti/grade.php',
        '/tag/coursetagslib.php',
        // Removed in 2.9.
        '/lib/timezone.txt',
        // Removed in 2.8.
        '/course/delete_category_form.php',
        // Removed in 2.7.
        '/admin/tool/qeupgradehelper/version.php',
        // Removed in 2.6.
        '/admin/block.php',
        '/admin/oacleanup.php',
        // Removed in 2.5.
        '/backup/lib.php',
        '/backup/bb/README.txt',
        '/lib/excel/test.php',
        // Removed in 2.4.
        '/admin/tool/unittest/simpletestlib.php',
        // Removed in 2.3.
        '/lib/minify/builder/',
        // Removed in 2.2.
        '/lib/yui/3.4.1pr1/',
        // Removed in 2.2.
        '/search/cron_php5.php',
        '/course/report/log/indexlive.php',
        '/admin/report/backups/index.php',
        '/admin/generator.php',
        // Removed in 2.1.
        '/lib/yui/2.8.0r4/',
        // Removed in 2.0.
        '/blocks/admin/block_admin.php',
        '/blocks/admin_tree/block_admin_tree.php',
    ];

    foreach ($someexamplesofremovedfiles as $file) {
        if (file_exists($CFG->dirroot.$file)) {
            return true;
        }
    }

    return false;
}

/**
 * Upgrade plugins
 * @param string $type The type of plugins that should be updated (e.g. 'enrol', 'qtype')
 * return void
 */
function upgrade_plugins($type, $startcallback, $endcallback, $verbose) {
    global $CFG, $DB;

/// special cases
    if ($type === 'mod') {
        return upgrade_plugins_modules($startcallback, $endcallback, $verbose);
    } else if ($type === 'block') {
        return upgrade_plugins_blocks($startcallback, $endcallback, $verbose);
    }

    $plugs = core_component::get_plugin_list($type);

    foreach ($plugs as $plug=>$fullplug) {
        // Reset time so that it works when installing a large number of plugins
        core_php_time_limit::raise(600);
        $component = clean_param($type.'_'.$plug, PARAM_COMPONENT); // standardised plugin name

        // check plugin dir is valid name
        if (empty($component)) {
            throw new plugin_defective_exception($type.'_'.$plug, 'Invalid plugin directory name.');
        }

        if (!is_readable($fullplug.'/version.php')) {
            continue;
        }

        $plugin = new stdClass();
        $plugin->version = null;
        $module = $plugin; // Prevent some notices when plugin placed in wrong directory.
        require($fullplug.'/version.php');  // defines $plugin with version etc
        unset($module);

        if (empty($plugin->version)) {
            throw new plugin_defective_exception($component, 'Missing $plugin->version number in version.php.');
        }

        if (empty($plugin->component)) {
            throw new plugin_defective_exception($component, 'Missing $plugin->component declaration in version.php.');
        }

        if ($plugin->component !== $component) {
            throw new plugin_misplaced_exception($plugin->component, null, $fullplug);
        }

        $plugin->name     = $plug;
        $plugin->fullname = $component;

        if (!empty($plugin->requires)) {
            if ($plugin->requires > $CFG->version) {
                throw new upgrade_requires_exception($component, $plugin->version, $CFG->version, $plugin->requires);
            } else if ($plugin->requires < 2010000000) {
                throw new plugin_defective_exception($component, 'Plugin is not compatible with Moodle 2.x or later.');
            }
        }

        // Throw exception if plugin is incompatible with moodle version.
        if (!empty($plugin->incompatible)) {
            if ($CFG->branch <= $plugin->incompatible) {
                throw new plugin_incompatible_exception($component, $plugin->version);
            }
        }

        // try to recover from interrupted install.php if needed
        if (file_exists($fullplug.'/db/install.php')) {
            if (get_config($plugin->fullname, 'installrunning')) {
                require_once($fullplug.'/db/install.php');
                $recover_install_function = 'xmldb_'.$plugin->fullname.'_install_recovery';
                if (function_exists($recover_install_function)) {
                    $startcallback($component, true, $verbose);
                    $recover_install_function();
                    unset_config('installrunning', $plugin->fullname);
                    update_capabilities($component);
                    log_update_descriptions($component);
                    external_update_descriptions($component);
                    \core\task\manager::reset_scheduled_tasks_for_component($component);
                    \core_analytics\manager::update_default_models_for_component($component);
                    message_update_providers($component);
                    \core\message\inbound\manager::update_handlers_for_component($component);
                    if ($type === 'message') {
                        message_update_processors($plug);
                    }
                    upgrade_plugin_mnet_functions($component);
                    core_tag_area::reset_definitions_for_component($component);
                    $endcallback($component, true, $verbose);
                }
            }
        }

        $installedversion = $DB->get_field('config_plugins', 'value', array('name'=>'version', 'plugin'=>$component)); // No caching!
        if (empty($installedversion)) { // new installation
            $startcallback($component, true, $verbose);

        /// Install tables if defined
            if (file_exists($fullplug.'/db/install.xml')) {
                $DB->get_manager()->install_from_xmldb_file($fullplug.'/db/install.xml');
            }

        /// store version
            upgrade_plugin_savepoint(true, $plugin->version, $type, $plug, false);

        /// execute post install file
            if (file_exists($fullplug.'/db/install.php')) {
                require_once($fullplug.'/db/install.php');
                set_config('installrunning', 1, $plugin->fullname);
                $post_install_function = 'xmldb_'.$plugin->fullname.'_install';
                $post_install_function();
                unset_config('installrunning', $plugin->fullname);
            }

        /// Install various components
            update_capabilities($component);
            log_update_descriptions($component);
            external_update_descriptions($component);
            \core\task\manager::reset_scheduled_tasks_for_component($component);
            \core_analytics\manager::update_default_models_for_component($component);
            message_update_providers($component);
            \core\message\inbound\manager::update_handlers_for_component($component);
            if ($type === 'message') {
                message_update_processors($plug);
            }
            upgrade_plugin_mnet_functions($component);
            core_tag_area::reset_definitions_for_component($component);
            $endcallback($component, true, $verbose);

        } else if ($installedversion < $plugin->version) { // upgrade
        /// Run the upgrade function for the plugin.
            $startcallback($component, false, $verbose);

            if (is_readable($fullplug.'/db/upgrade.php')) {
                require_once($fullplug.'/db/upgrade.php');  // defines upgrading function

                $newupgrade_function = 'xmldb_'.$plugin->fullname.'_upgrade';
                $result = $newupgrade_function($installedversion);
            } else {
                $result = true;
            }

            $installedversion = $DB->get_field('config_plugins', 'value', array('name'=>'version', 'plugin'=>$component)); // No caching!
            if ($installedversion < $plugin->version) {
                // store version if not already there
                upgrade_plugin_savepoint($result, $plugin->version, $type, $plug, false);
            }

        /// Upgrade various components
            update_capabilities($component);
            log_update_descriptions($component);
            external_update_descriptions($component);
            \core\task\manager::reset_scheduled_tasks_for_component($component);
            \core_analytics\manager::update_default_models_for_component($component);
            message_update_providers($component);
            \core\message\inbound\manager::update_handlers_for_component($component);
            if ($type === 'message') {
                // Ugly hack!
                message_update_processors($plug);
            }
            upgrade_plugin_mnet_functions($component);
            core_tag_area::reset_definitions_for_component($component);
            $endcallback($component, false, $verbose);

        } else if ($installedversion > $plugin->version) {
            throw new downgrade_exception($component, $installedversion, $plugin->version);
        }
    }
}

/**
 * Find and check all modules and load them up or upgrade them if necessary
 *
 * @global object
 * @global object
 */
function upgrade_plugins_modules($startcallback, $endcallback, $verbose) {
    global $CFG, $DB;

    $mods = core_component::get_plugin_list('mod');

    foreach ($mods as $mod=>$fullmod) {

        if ($mod === 'NEWMODULE') {   // Someone has unzipped the template, ignore it
            continue;
        }

        $component = clean_param('mod_'.$mod, PARAM_COMPONENT);

        // check module dir is valid name
        if (empty($component)) {
            throw new plugin_defective_exception('mod_'.$mod, 'Invalid plugin directory name.');
        }

        if (!is_readable($fullmod.'/version.php')) {
            throw new plugin_defective_exception($component, 'Missing version.php');
        }

        $module = new stdClass();
        $plugin = new stdClass();
        $plugin->version = null;
        require($fullmod .'/version.php');  // Defines $plugin with version etc.

        // Check if the legacy $module syntax is still used.
        if (!is_object($module) or (count((array)$module) > 0)) {
            throw new plugin_defective_exception($component, 'Unsupported $module syntax detected in version.php');
        }

        // Prepare the record for the {modules} table.
        $module = clone($plugin);
        unset($module->version);
        unset($module->component);
        unset($module->dependencies);
        unset($module->release);

        if (empty($plugin->version)) {
            throw new plugin_defective_exception($component, 'Missing $plugin->version number in version.php.');
        }

        if (empty($plugin->component)) {
            throw new plugin_defective_exception($component, 'Missing $plugin->component declaration in version.php.');
        }

        if ($plugin->component !== $component) {
            throw new plugin_misplaced_exception($plugin->component, null, $fullmod);
        }

        if (!empty($plugin->requires)) {
            if ($plugin->requires > $CFG->version) {
                throw new upgrade_requires_exception($component, $plugin->version, $CFG->version, $plugin->requires);
            } else if ($plugin->requires < 2010000000) {
                throw new plugin_defective_exception($component, 'Plugin is not compatible with Moodle 2.x or later.');
            }
        }

        if (empty($module->cron)) {
            $module->cron = 0;
        }

        // all modules must have en lang pack
        if (!is_readable("$fullmod/lang/en/$mod.php")) {
            throw new plugin_defective_exception($component, 'Missing mandatory en language pack.');
        }

        $module->name = $mod;   // The name MUST match the directory

        $installedversion = $DB->get_field('config_plugins', 'value', array('name'=>'version', 'plugin'=>$component)); // No caching!

        if (file_exists($fullmod.'/db/install.php')) {
            if (get_config($module->name, 'installrunning')) {
                require_once($fullmod.'/db/install.php');
                $recover_install_function = 'xmldb_'.$module->name.'_install_recovery';
                if (function_exists($recover_install_function)) {
                    $startcallback($component, true, $verbose);
                    $recover_install_function();
                    unset_config('installrunning', $module->name);
                    // Install various components too
                    update_capabilities($component);
                    log_update_descriptions($component);
                    external_update_descriptions($component);
                    \core\task\manager::reset_scheduled_tasks_for_component($component);
                    \core_analytics\manager::update_default_models_for_component($component);
                    message_update_providers($component);
                    \core\message\inbound\manager::update_handlers_for_component($component);
                    upgrade_plugin_mnet_functions($component);
                    core_tag_area::reset_definitions_for_component($component);
                    $endcallback($component, true, $verbose);
                }
            }
        }

        if (empty($installedversion)) {
            $startcallback($component, true, $verbose);

        /// Execute install.xml (XMLDB) - must be present in all modules
            $DB->get_manager()->install_from_xmldb_file($fullmod.'/db/install.xml');

        /// Add record into modules table - may be needed in install.php already
            $module->id = $DB->insert_record('modules', $module);
            upgrade_mod_savepoint(true, $plugin->version, $module->name, false);

        /// Post installation hook - optional
            if (file_exists("$fullmod/db/install.php")) {
                require_once("$fullmod/db/install.php");
                // Set installation running flag, we need to recover after exception or error
                set_config('installrunning', 1, $module->name);
                $post_install_function = 'xmldb_'.$module->name.'_install';
                $post_install_function();
                unset_config('installrunning', $module->name);
            }

        /// Install various components
            update_capabilities($component);
            log_update_descriptions($component);
            external_update_descriptions($component);
            \core\task\manager::reset_scheduled_tasks_for_component($component);
            \core_analytics\manager::update_default_models_for_component($component);
            message_update_providers($component);
            \core\message\inbound\manager::update_handlers_for_component($component);
            upgrade_plugin_mnet_functions($component);
            core_tag_area::reset_definitions_for_component($component);

            $endcallback($component, true, $verbose);

        } else if ($installedversion < $plugin->version) {
        /// If versions say that we need to upgrade but no upgrade files are available, notify and continue
            $startcallback($component, false, $verbose);

            if (is_readable($fullmod.'/db/upgrade.php')) {
                require_once($fullmod.'/db/upgrade.php');  // defines new upgrading function
                $newupgrade_function = 'xmldb_'.$module->name.'_upgrade';
                $result = $newupgrade_function($installedversion, $module);
            } else {
                $result = true;
            }

            $installedversion = $DB->get_field('config_plugins', 'value', array('name'=>'version', 'plugin'=>$component)); // No caching!
            $currmodule = $DB->get_record('modules', array('name'=>$module->name));
            if ($installedversion < $plugin->version) {
                // store version if not already there
                upgrade_mod_savepoint($result, $plugin->version, $mod, false);
            }

            // update cron flag if needed
            if ($currmodule->cron != $module->cron) {
                $DB->set_field('modules', 'cron', $module->cron, array('name' => $module->name));
            }

            // Upgrade various components
            update_capabilities($component);
            log_update_descriptions($component);
            external_update_descriptions($component);
            \core\task\manager::reset_scheduled_tasks_for_component($component);
            \core_analytics\manager::update_default_models_for_component($component);
            message_update_providers($component);
            \core\message\inbound\manager::update_handlers_for_component($component);
            upgrade_plugin_mnet_functions($component);
            core_tag_area::reset_definitions_for_component($component);

            $endcallback($component, false, $verbose);

        } else if ($installedversion > $plugin->version) {
            throw new downgrade_exception($component, $installedversion, $plugin->version);
        }
    }
}


/**
 * This function finds all available blocks and install them
 * into blocks table or do all the upgrade process if newer.
 *
 * @global object
 * @global object
 */
function upgrade_plugins_blocks($startcallback, $endcallback, $verbose) {
    global $CFG, $DB;

    require_once($CFG->dirroot.'/blocks/moodleblock.class.php');

    $blocktitles   = array(); // we do not want duplicate titles

    //Is this a first install
    $first_install = null;

    $blocks = core_component::get_plugin_list('block');

    foreach ($blocks as $blockname=>$fullblock) {

        if (is_null($first_install)) {
            $first_install = ($DB->count_records('block_instances') == 0);
        }

        if ($blockname === 'NEWBLOCK') {   // Someone has unzipped the template, ignore it
            continue;
        }

        $component = clean_param('block_'.$blockname, PARAM_COMPONENT);

        // check block dir is valid name
        if (empty($component)) {
            throw new plugin_defective_exception('block_'.$blockname, 'Invalid plugin directory name.');
        }

        if (!is_readable($fullblock.'/version.php')) {
            throw new plugin_defective_exception('block/'.$blockname, 'Missing version.php file.');
        }
        $plugin = new stdClass();
        $plugin->version = null;
        $plugin->cron    = 0;
        $module = $plugin; // Prevent some notices when module placed in wrong directory.
        include($fullblock.'/version.php');
        unset($module);
        $block = clone($plugin);
        unset($block->version);
        unset($block->component);
        unset($block->dependencies);
        unset($block->release);

        if (empty($plugin->version)) {
            throw new plugin_defective_exception($component, 'Missing block version number in version.php.');
        }

        if (empty($plugin->component)) {
            throw new plugin_defective_exception($component, 'Missing $plugin->component declaration in version.php.');
        }

        if ($plugin->component !== $component) {
            throw new plugin_misplaced_exception($plugin->component, null, $fullblock);
        }

        if (!empty($plugin->requires)) {
            if ($plugin->requires > $CFG->version) {
                throw new upgrade_requires_exception($component, $plugin->version, $CFG->version, $plugin->requires);
            } else if ($plugin->requires < 2010000000) {
                throw new plugin_defective_exception($component, 'Plugin is not compatible with Moodle 2.x or later.');
            }
        }

        if (!is_readable($fullblock.'/block_'.$blockname.'.php')) {
            throw new plugin_defective_exception('block/'.$blockname, 'Missing main block class file.');
        }
        include_once($fullblock.'/block_'.$blockname.'.php');

        $classname = 'block_'.$blockname;

        if (!class_exists($classname)) {
            throw new plugin_defective_exception($component, 'Can not load main class.');
        }

        $blockobj    = new $classname;   // This is what we'll be testing
        $blocktitle  = $blockobj->get_title();

        // OK, it's as we all hoped. For further tests, the object will do them itself.
        if (!$blockobj->_self_test()) {
            throw new plugin_defective_exception($component, 'Self test failed.');
        }

        $block->name     = $blockname;   // The name MUST match the directory

        $installedversion = $DB->get_field('config_plugins', 'value', array('name'=>'version', 'plugin'=>$component)); // No caching!

        if (file_exists($fullblock.'/db/install.php')) {
            if (get_config('block_'.$blockname, 'installrunning')) {
                require_once($fullblock.'/db/install.php');
                $recover_install_function = 'xmldb_block_'.$blockname.'_install_recovery';
                if (function_exists($recover_install_function)) {
                    $startcallback($component, true, $verbose);
                    $recover_install_function();
                    unset_config('installrunning', 'block_'.$blockname);
                    // Install various components
                    update_capabilities($component);
                    log_update_descriptions($component);
                    external_update_descriptions($component);
                    \core\task\manager::reset_scheduled_tasks_for_component($component);
                    \core_analytics\manager::update_default_models_for_component($component);
                    message_update_providers($component);
                    \core\message\inbound\manager::update_handlers_for_component($component);
                    upgrade_plugin_mnet_functions($component);
                    core_tag_area::reset_definitions_for_component($component);
                    $endcallback($component, true, $verbose);
                }
            }
        }

        if (empty($installedversion)) { // block not installed yet, so install it
            $conflictblock = array_search($blocktitle, $blocktitles);
            if ($conflictblock !== false) {
                // Duplicate block titles are not allowed, they confuse people
                // AND PHP's associative arrays ;)
                throw new plugin_defective_exception($component, get_string('blocknameconflict', 'error', (object)array('name'=>$block->name, 'conflict'=>$conflictblock)));
            }
            $startcallback($component, true, $verbose);

            if (file_exists($fullblock.'/db/install.xml')) {
                $DB->get_manager()->install_from_xmldb_file($fullblock.'/db/install.xml');
            }
            $block->id = $DB->insert_record('block', $block);
            upgrade_block_savepoint(true, $plugin->version, $block->name, false);

            if (file_exists($fullblock.'/db/install.php')) {
                require_once($fullblock.'/db/install.php');
                // Set installation running flag, we need to recover after exception or error
                set_config('installrunning', 1, 'block_'.$blockname);
                $post_install_function = 'xmldb_block_'.$blockname.'_install';
                $post_install_function();
                unset_config('installrunning', 'block_'.$blockname);
            }

            $blocktitles[$block->name] = $blocktitle;

            // Install various components
            update_capabilities($component);
            log_update_descriptions($component);
            external_update_descriptions($component);
            \core\task\manager::reset_scheduled_tasks_for_component($component);
            \core_analytics\manager::update_default_models_for_component($component);
            message_update_providers($component);
            \core\message\inbound\manager::update_handlers_for_component($component);
            core_tag_area::reset_definitions_for_component($component);
            upgrade_plugin_mnet_functions($component);

            $endcallback($component, true, $verbose);

        } else if ($installedversion < $plugin->version) {
            $startcallback($component, false, $verbose);

            if (is_readable($fullblock.'/db/upgrade.php')) {
                require_once($fullblock.'/db/upgrade.php');  // defines new upgrading function
                $newupgrade_function = 'xmldb_block_'.$blockname.'_upgrade';
                $result = $newupgrade_function($installedversion, $block);
            } else {
                $result = true;
            }

            $installedversion = $DB->get_field('config_plugins', 'value', array('name'=>'version', 'plugin'=>$component)); // No caching!
            $currblock = $DB->get_record('block', array('name'=>$block->name));
            if ($installedversion < $plugin->version) {
                // store version if not already there
                upgrade_block_savepoint($result, $plugin->version, $block->name, false);
            }

            if ($currblock->cron != $block->cron) {
                // update cron flag if needed
                $DB->set_field('block', 'cron', $block->cron, array('id' => $currblock->id));
            }

            // Upgrade various components
            update_capabilities($component);
            log_update_descriptions($component);
            external_update_descriptions($component);
            \core\task\manager::reset_scheduled_tasks_for_component($component);
            \core_analytics\manager::update_default_models_for_component($component);
            message_update_providers($component);
            \core\message\inbound\manager::update_handlers_for_component($component);
            upgrade_plugin_mnet_functions($component);
            core_tag_area::reset_definitions_for_component($component);

            $endcallback($component, false, $verbose);

        } else if ($installedversion > $plugin->version) {
            throw new downgrade_exception($component, $installedversion, $plugin->version);
        }
    }


    // Finally, if we are in the first_install of BLOCKS setup frontpage and admin page blocks
    if ($first_install) {
        //Iterate over each course - there should be only site course here now
        if ($courses = $DB->get_records('course')) {
            foreach ($courses as $course) {
                blocks_add_default_course_blocks($course);
            }
        }

        blocks_add_default_system_blocks();
    }
}


/**
 * Log_display description function used during install and upgrade.
 *
 * @param string $component name of component (moodle, mod_assignment, etc.)
 * @return void
 */
function log_update_descriptions($component) {
    global $DB;

    $defpath = core_component::get_component_directory($component).'/db/log.php';

    if (!file_exists($defpath)) {
        $DB->delete_records('log_display', array('component'=>$component));
        return;
    }

    // load new info
    $logs = array();
    include($defpath);
    $newlogs = array();
    foreach ($logs as $log) {
        $newlogs[$log['module'].'-'.$log['action']] = $log; // kind of unique name
    }
    unset($logs);
    $logs = $newlogs;

    $fields = array('module', 'action', 'mtable', 'field');
    // update all log fist
    $dblogs = $DB->get_records('log_display', array('component'=>$component));
    foreach ($dblogs as $dblog) {
        $name = $dblog->module.'-'.$dblog->action;

        if (empty($logs[$name])) {
            $DB->delete_records('log_display', array('id'=>$dblog->id));
            continue;
        }

        $log = $logs[$name];
        unset($logs[$name]);

        $update = false;
        foreach ($fields as $field) {
            if ($dblog->$field != $log[$field]) {
                $dblog->$field = $log[$field];
                $update = true;
            }
        }
        if ($update) {
            $DB->update_record('log_display', $dblog);
        }
    }
    foreach ($logs as $log) {
        $dblog = (object)$log;
        $dblog->component = $component;
        $DB->insert_record('log_display', $dblog);
    }
}

/**
 * Web service discovery function used during install and upgrade.
 * @param string $component name of component (moodle, mod_assignment, etc.)
 * @return void
 */
function external_update_descriptions($component) {
    global $DB, $CFG;

    $defpath = core_component::get_component_directory($component).'/db/services.php';

    if (!file_exists($defpath)) {
        require_once($CFG->dirroot.'/lib/externallib.php');
        external_delete_descriptions($component);
        return;
    }

    // load new info
    $functions = array();
    $services = array();
    include($defpath);

    // update all function fist
    $dbfunctions = $DB->get_records('external_functions', array('component'=>$component));
    foreach ($dbfunctions as $dbfunction) {
        if (empty($functions[$dbfunction->name])) {
            $DB->delete_records('external_functions', array('id'=>$dbfunction->id));
            // do not delete functions from external_services_functions, beacuse
            // we want to notify admins when functions used in custom services disappear

            //TODO: this looks wrong, we have to delete it eventually (skodak)
            continue;
        }

        $function = $functions[$dbfunction->name];
        unset($functions[$dbfunction->name]);
        $function['classpath'] = empty($function['classpath']) ? null : $function['classpath'];
        $function['methodname'] = $function['methodname'] ?? 'execute';

        $update = false;
        if ($dbfunction->classname != $function['classname']) {
            $dbfunction->classname = $function['classname'];
            $update = true;
        }
        if ($dbfunction->methodname != $function['methodname']) {
            $dbfunction->methodname = $function['methodname'];
            $update = true;
        }
        if ($dbfunction->classpath != $function['classpath']) {
            $dbfunction->classpath = $function['classpath'];
            $update = true;
        }
        $functioncapabilities = array_key_exists('capabilities', $function)?$function['capabilities']:'';
        if ($dbfunction->capabilities != $functioncapabilities) {
            $dbfunction->capabilities = $functioncapabilities;
            $update = true;
        }

        if (isset($function['services']) and is_array($function['services'])) {
            sort($function['services']);
            $functionservices = implode(',', $function['services']);
        } else {
            // Force null values in the DB.
            $functionservices = null;
        }

        if ($dbfunction->services != $functionservices) {
            // Now, we need to check if services were removed, in that case we need to remove the function from them.
            $servicesremoved = array_diff(explode(",", $dbfunction->services), explode(",", $functionservices));
            foreach ($servicesremoved as $removedshortname) {
                if ($externalserviceid = $DB->get_field('external_services', 'id', array("shortname" => $removedshortname))) {
                    $DB->delete_records('external_services_functions', array('functionname' => $dbfunction->name,
                                                                                'externalserviceid' => $externalserviceid));
                }
            }

            $dbfunction->services = $functionservices;
            $update = true;
        }
        if ($update) {
            $DB->update_record('external_functions', $dbfunction);
        }
    }
    foreach ($functions as $fname => $function) {
        $dbfunction = new stdClass();
        $dbfunction->name       = $fname;
        $dbfunction->classname  = $function['c…