Proyectos de Subversion Moodle

<?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/>.

/**

 * Class for Moodle Mobile tools.

 *

 * @package    tool_mobile

 * @copyright  2016 Juan Leyva

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 * @since      Moodle 3.1

 */

namespace tool_mobile;

use core_component;

use core_plugin_manager;

use context_system;

use moodle_url;

use moodle_exception;

use lang_string;

use curl;

use core_qrcode;

use stdClass;

/**

 * API exposed by tool_mobile, to be used mostly by external functions and the plugin settings.

 *

 * @copyright  2016 Juan Leyva

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 * @since      Moodle 3.1

 */

class api {

    /** @var int to identify the login via app. */

    const LOGIN_VIA_APP = 1;

    /** @var int to identify the login via browser. */

    const LOGIN_VIA_BROWSER = 2;

    /** @var int to identify the login via an embedded browser. */

    const LOGIN_VIA_EMBEDDED_BROWSER = 3;

    /** @var int seconds an auto-login key will expire. */

    const LOGIN_KEY_TTL = 60;

    /** @var string URL of the Moodle Apps Portal */

    const MOODLE_APPS_PORTAL_URL = 'https://apps.moodle.com';

    /** @var int default value in seconds a QR login key will expire. */

    const LOGIN_QR_KEY_TTL = 600;

    /** @var int QR code disabled value */

    const QR_CODE_DISABLED = 0;

    /** @var int QR code type URL value */

    const QR_CODE_URL = 1;

    /** @var int QR code type login value */

    const QR_CODE_LOGIN = 2;

    /** @var string Default Android app id */

    const DEFAULT_ANDROID_APP_ID = 'com.moodle.moodlemobile';

    /** @var string Default iOS app id */

    const DEFAULT_IOS_APP_ID = '633359593';

    /** @var int AUTOLOGOUT disabled value */

    const AUTOLOGOUT_DISABLED = 0;

    /** @var int AUTOLOGOUT type inmediate value */

    const AUTOLOGOUT_INMEDIATE = 1;

    /** @var int AUTOLOGOUT type custom value */

    const AUTOLOGOUT_CUSTOM = 2;

    /**

     * Returns a list of Moodle plugins supporting the mobile app.

     *

     * @return array an array of objects containing the plugin information

     */

    public static function get_plugins_supporting_mobile() {

        global $CFG;

        require_once($CFG->libdir . '/adminlib.php');

        $cachekey = 'mobileplugins';

        if (!isloggedin()) {

            $cachekey = 'authmobileplugins';    // Use a different cache for not logged users.

        }

        // Check if we can return this from cache.

        $cache = \cache::make('tool_mobile', 'plugininfo');

        $pluginsinfo = $cache->get($cachekey);

        if ($pluginsinfo !== false) {

            return (array)$pluginsinfo;

        }

        $pluginsinfo = [];

        // For not logged users return only auth plugins.

        // This is to avoid anyone (not being a registered user) to obtain and download all the site remote add-ons.

        if (!isloggedin()) {

            $plugintypes = array('auth' => $CFG->dirroot.'/auth');

        } else {

            $plugintypes = core_component::get_plugin_types();

        }

        foreach ($plugintypes as $plugintype => $unused) {

            // We need to include files here.

            $pluginswithfile = core_component::get_plugin_list_with_file($plugintype, 'db' . DIRECTORY_SEPARATOR . 'mobile.php');

            foreach ($pluginswithfile as $plugin => $notused) {

                $path = core_component::get_plugin_directory($plugintype, $plugin);

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

                $version = get_component_version($component);

                require("$path/db/mobile.php");

                foreach ($addons as $addonname => $addoninfo) {

                    // Add handlers (for site add-ons).

                    $handlers = !empty($addoninfo['handlers']) ? $addoninfo['handlers'] : array();

                    $handlers = json_encode($handlers); // JSON formatted, since it is a complex structure that may vary over time.

                    // Now language strings used by the app.

                    $lang = array();

                    if (!empty($addoninfo['lang'])) {

                        $stringmanager = get_string_manager();

                        $langs = $stringmanager->get_list_of_translations(true);

                        foreach ($langs as $langid => $langname) {

                            foreach ($addoninfo['lang'] as $stringinfo) {

                                $lang[$langid][$stringinfo[0]] = $stringmanager->get_string(

                                    $stringinfo[0],

                                    $stringinfo[1] ?? '',

                                    null,

                                    $langid,

                                );

                            }

                        }

                    }

                    $lang = json_encode($lang);

                    $plugininfo = array(

                        'component' => $component,

                        'version' => $version,

                        'addon' => $addonname,

                        'dependencies' => !empty($addoninfo['dependencies']) ? $addoninfo['dependencies'] : array(),

                        'fileurl' => '',

                        'filehash' => '',

                        'filesize' => 0,

                        'handlers' => $handlers,

                        'lang' => $lang,

                    );

                    // All the mobile packages must be under the plugin mobile directory.

                    $package = $path . '/mobile/' . $addonname . '.zip';

                    if (file_exists($package)) {

                        $plugininfo['fileurl'] = $CFG->wwwroot . '' . str_replace($CFG->dirroot, '', $package);

                        $plugininfo['filehash'] = sha1_file($package);

                        $plugininfo['filesize'] = filesize($package);

                    }

                    $pluginsinfo[] = $plugininfo;

                }

            }

        }

        $cache->set($cachekey, $pluginsinfo);

        return $pluginsinfo;

    }

    /**

     * Returns a list of the site public settings, those not requiring authentication.

     *

     * @return array with the settings and warnings

     */

    public static function get_public_config() {

        global $CFG, $SITE, $PAGE, $OUTPUT;

        require_once($CFG->libdir . '/authlib.php');

        $context = context_system::instance();

        // We need this to make work the format text functions.

        $PAGE->set_context($context);

        // Check if contacting site support is available to all visitors.

        $sitesupportavailable = (isset($CFG->supportavailability) && $CFG->supportavailability == CONTACT_SUPPORT_ANYONE);

        [$authinstructions] = \core_external\util::format_text($CFG->auth_instructions, FORMAT_MOODLE, $context->id);

        [$maintenancemessage] = \core_external\util::format_text($CFG->maintenance_message, FORMAT_MOODLE, $context->id);

        $settings = array(

            'wwwroot' => $CFG->wwwroot,

            'httpswwwroot' => $CFG->wwwroot,

            'sitename' => \core_external\util::format_string($SITE->fullname, $context->id, true),

            'guestlogin' => $CFG->guestloginbutton,

            'rememberusername' => $CFG->rememberusername,

            'authloginviaemail' => $CFG->authloginviaemail,

            'registerauth' => $CFG->registerauth,

            'forgottenpasswordurl' => clean_param($CFG->forgottenpasswordurl, PARAM_URL), // We may expect a mailto: here.

            'authinstructions' => $authinstructions,

            'authnoneenabled' => (int) is_enabled_auth('none'),

            'enablewebservices' => $CFG->enablewebservices,

            'enablemobilewebservice' => $CFG->enablemobilewebservice,

            'maintenanceenabled' => $CFG->maintenance_enabled,

            'maintenancemessage' => $maintenancemessage,

            'mobilecssurl' => !empty($CFG->mobilecssurl) ? $CFG->mobilecssurl : '',

            'tool_mobile_disabledfeatures' => get_config('tool_mobile', 'disabledfeatures'),

            'country' => clean_param($CFG->country, PARAM_NOTAGS),

            'agedigitalconsentverification' => \core_auth\digital_consent::is_age_digital_consent_verification_enabled(),

            'autolang' => $CFG->autolang,

            'lang' => clean_param($CFG->lang, PARAM_LANG),  // Avoid breaking WS because of incorrect package langs.

            'langmenu' => $CFG->langmenu,

            'langlist' => $CFG->langlist,

            'locale' => $CFG->locale,

            'tool_mobile_minimumversion' => get_config('tool_mobile', 'minimumversion'),

            'tool_mobile_iosappid' => get_config('tool_mobile', 'iosappid'),

            'tool_mobile_androidappid' => get_config('tool_mobile', 'androidappid'),

            'tool_mobile_setuplink' => clean_param(get_config('tool_mobile', 'setuplink'), PARAM_URL),

            'tool_mobile_qrcodetype' => clean_param(get_config('tool_mobile', 'qrcodetype'), PARAM_INT),

            'supportpage' => $sitesupportavailable ? clean_param($CFG->supportpage, PARAM_URL) : '',

            'supportavailability' => clean_param($CFG->supportavailability, PARAM_INT),

        );

        $typeoflogin = get_config('tool_mobile', 'typeoflogin');

        // Not found, edge case.

        if ($typeoflogin === false) {

            $typeoflogin = self::LOGIN_VIA_APP; // Defaults to via app.

        }

        $settings['typeoflogin'] = $typeoflogin;

        // Check if the user can sign-up to return the launch URL in that case.

        $cansignup = signup_is_enabled();

        $url = new moodle_url("/$CFG->admin/tool/mobile/launch.php");

        $settings['launchurl'] = $url->out(false);

        // Check that we are receiving a moodle_url object, themes can override get_logo_url and may return incorrect values.

        if (($logourl = $OUTPUT->get_logo_url()) && $logourl instanceof moodle_url) {

            $settings['logourl'] = clean_param($logourl->out(false), PARAM_URL);

        }

        if (($compactlogourl = $OUTPUT->get_compact_logo_url()) && $compactlogourl instanceof moodle_url) {

            $settings['compactlogourl'] = clean_param($compactlogourl->out(false), PARAM_URL);

        }

        // Identity providers.

        $authsequence = get_enabled_auth_plugins();

        $identityproviders = \auth_plugin_base::get_identity_providers($authsequence);

        $identityprovidersdata = \auth_plugin_base::prepare_identity_providers_for_output($identityproviders, $OUTPUT);

        if (!empty($identityprovidersdata)) {

            $settings['identityproviders'] = $identityprovidersdata;

            // Clean URLs to avoid breaking Web Services.

            // We can't do it in prepare_identity_providers_for_output() because it may break the web output.

            foreach ($settings['identityproviders'] as &$ip) {

                $ip['url'] = (!empty($ip['url'])) ? clean_param($ip['url'], PARAM_URL) : '';

                $ip['iconurl'] = (!empty($ip['iconurl'])) ? clean_param($ip['iconurl'], PARAM_URL) : '';

            }

        }

        // If age is verified or support is available to all visitors, also return the admin contact details.

        if ($settings['agedigitalconsentverification'] || $sitesupportavailable) {

            $settings['supportname'] = clean_param($CFG->supportname, PARAM_NOTAGS);

            $settings['supportemail'] = clean_param($CFG->supportemail, PARAM_EMAIL);

        }

        return $settings;

    }

    /**

     * Returns a list of site configurations, filtering by section.

     *

     * @param  string $section section name

     * @return stdClass object containing the settings

     */

    public static function get_config($section) {

        global $CFG, $SITE;

        $settings = new \stdClass;

        $context = context_system::instance();

        $isadmin = has_capability('moodle/site:config', $context);

        if (empty($section) or $section == 'frontpagesettings') {

            require_once($CFG->dirroot . '/course/format/lib.php');

            // First settings that anyone can deduce.

            $settings->fullname = \core_external\util::format_string($SITE->fullname, $context->id);

            $settings->shortname = \core_external\util::format_string($SITE->shortname, $context->id);

            // Return to a var instead of directly to $settings object because of differences between

            // list() in php5 and php7. {@link http://php.net/manual/en/function.list.php}

            $formattedsummary = \core_external\util::format_text($SITE->summary, $SITE->summaryformat,

                                                                                        $context->id);

            $settings->summary = $formattedsummary[0];

            $settings->summaryformat = $formattedsummary[1];

            $settings->frontpage = $CFG->frontpage;

            $settings->frontpageloggedin = $CFG->frontpageloggedin;

            $settings->maxcategorydepth = $CFG->maxcategorydepth;

            $settings->frontpagecourselimit = $CFG->frontpagecourselimit;

            $settings->numsections = course_get_format($SITE)->get_last_section_number();

            $settings->newsitems = $SITE->newsitems;

            $settings->commentsperpage = $CFG->commentsperpage;

            // Now, admin settings.

            if ($isadmin) {

                $settings->defaultfrontpageroleid = $CFG->defaultfrontpageroleid;

            }

        }

        if (empty($section) or $section == 'sitepolicies') {

            $manager = new \core_privacy\local\sitepolicy\manager();

            $settings->sitepolicy = ($sitepolicy = $manager->get_embed_url()) ? $sitepolicy->out(false) : '';

            $settings->sitepolicyhandler = $CFG->sitepolicyhandler;

            $settings->disableuserimages = $CFG->disableuserimages;

        }

        if (empty($section) or $section == 'gradessettings') {

            require_once($CFG->dirroot . '/user/lib.php');

            $settings->mygradesurl = user_mygrades_url();

            // The previous function may return moodle_url instances or plain string URLs.

            if ($settings->mygradesurl instanceof moodle_url) {

                $settings->mygradesurl = $settings->mygradesurl->out(false);

            }

        }

        if (empty($section) or $section == 'mobileapp') {

            $settings->tool_mobile_forcelogout = get_config('tool_mobile', 'forcelogout');

            $settings->tool_mobile_customlangstrings = get_config('tool_mobile', 'customlangstrings');

            $settings->tool_mobile_disabledfeatures = get_config('tool_mobile', 'disabledfeatures');

            $settings->tool_mobile_filetypeexclusionlist = get_config('tool_mobile', 'filetypeexclusionlist');

            $settings->tool_mobile_custommenuitems = get_config('tool_mobile', 'custommenuitems');

            $settings->tool_mobile_apppolicy = get_config('tool_mobile', 'apppolicy');

            // This setting could be not set in some edge cases such as bad upgrade.

            $mintimereq = get_config('tool_mobile', 'autologinmintimebetweenreq');

            $mintimereq = empty($mintimereq) ? 6 * MINSECS : $mintimereq;

            $settings->tool_mobile_autologinmintimebetweenreq = $mintimereq;

            $settings->tool_mobile_autologout = get_config('tool_mobile', 'autologout');

            $settings->tool_mobile_autologouttime = get_config('tool_mobile', 'autologouttime');

        }

        if (empty($section) or $section == 'calendar') {

            $settings->calendartype = $CFG->calendartype;

            $settings->calendar_site_timeformat = $CFG->calendar_site_timeformat;

            $settings->calendar_startwday = $CFG->calendar_startwday;

            $settings->calendar_adminseesall = $CFG->calendar_adminseesall;

            $settings->calendar_lookahead = $CFG->calendar_lookahead;

            $settings->calendar_maxevents = $CFG->calendar_maxevents;

        }

        if (empty($section) or $section == 'coursecolors') {

            $colornumbers = range(1, 10);

            foreach ($colornumbers as $number) {

                $settings->{'core_admin_coursecolor' . $number} = get_config('core_admin', 'coursecolor' . $number);

            }

        }

        if (empty($section) or $section == 'supportcontact') {

            $settings->supportavailability = $CFG->supportavailability;

            if ($CFG->supportavailability == CONTACT_SUPPORT_DISABLED) {

                $settings->supportname = null;

                $settings->supportemail = null;

                $settings->supportpage = null;

            } else {

                $settings->supportname = $CFG->supportname;

                $settings->supportemail = $CFG->supportemail ?? null;

                $settings->supportpage = $CFG->supportpage;

            }

        }

        if (empty($section) || $section === 'graceperiodsettings') {

            $settings->coursegraceperiodafter = $CFG->coursegraceperiodafter;

            $settings->coursegraceperiodbefore = $CFG->coursegraceperiodbefore;

        }

        if (empty($section) || $section === 'navigation') {

            $settings->enabledashboard = $CFG->enabledashboard;

        }

        if (empty($section) || ($section === 'themesettings' || $section === 'themesettingsadvanced')) {

            $settings->customusermenuitems = $CFG->customusermenuitems;

        }

        if (empty($section) || $section === 'locationsettings') {

            $settings->timezone = $CFG->timezone;

            $settings->forcetimezone = $CFG->forcetimezone;

        }

        if (empty($section) || $section === 'manageglobalsearch') {

            $settings->searchengine = $CFG->searchengine;

            $settings->searchenablecategories = $CFG->searchenablecategories;

            $settings->searchdefaultcategory = $CFG->searchdefaultcategory;

            $settings->searchhideallcategory = $CFG->searchhideallcategory;

            $settings->searchmaxtopresults = $CFG->searchmaxtopresults;

            $settings->searchbannerenable = $CFG->searchbannerenable;

            $settings->searchbanner = \core_external\util::format_text(

                $CFG->searchbanner, FORMAT_HTML, $context)[0];

        }

        if (empty($section) || $section === 'privacysettings') {

            $settings->tool_dataprivacy_contactdataprotectionofficer = get_config('tool_dataprivacy', 'contactdataprotectionofficer');

            $settings->tool_dataprivacy_showdataretentionsummary = get_config('tool_dataprivacy', 'showdataretentionsummary');

        }

        if (empty($section) || $section === 'blog') {

            $settings->useblogassociations = $CFG->useblogassociations;

            $settings->bloglevel = $CFG->bloglevel;

            $settings->blogusecomments = $CFG->blogusecomments;

        }

        if (empty($section) || $section === 'h5psettings') {

            \core_h5p\local\library\autoloader::register();

            $customcss = \core_h5p\file_storage::get_custom_styles();

            if (!empty($customcss)) {

                $settings->h5pcustomcssurl = $customcss['cssurl']->out() . '?ver=' . $customcss['cssversion'];

            }

        }

        return $settings;

    }

    /*

     * Check if all the required conditions are met to allow the auto-login process continue.

     *

     * @param  int $userid  current user id

     * @since Moodle 3.2

     * @throws moodle_exception

     */

    public static function check_autologin_prerequisites($userid) {

        global $CFG;

        if (!$CFG->enablewebservices or !$CFG->enablemobilewebservice) {

            throw new moodle_exception('enablewsdescription', 'webservice');

        }

        if (!is_https()) {

            throw new moodle_exception('httpsrequired', 'tool_mobile');

        }

        if (has_capability('moodle/site:config', context_system::instance(), $userid) or is_siteadmin($userid)) {

            throw new moodle_exception('autologinnotallowedtoadmins', 'tool_mobile');

        }

    }

    /**

     * Creates an auto-login key for the current user, this key is restricted by time and ip address.

     * This key is used for automatically login the user in the site when the Moodle app opens the site in a mobile browser.

     *

     * @return string the key

     * @since Moodle 3.2

     */

    public static function get_autologin_key() {

        global $USER;

        // Delete previous keys.

        delete_user_key('tool_mobile', $USER->id);

        // Create a new key.

        $iprestriction = getremoteaddr();

        $validuntil = time() + self::LOGIN_KEY_TTL;

        return create_user_key('tool_mobile', $USER->id, null, $iprestriction, $validuntil);

    }

    /**

     * Creates a QR login key for the current user, this key is restricted by time and ip address.

     * This key is used for automatically login the user in the site when the user scans a QR code in the Moodle app.

     *

     * @param  stdClass $mobilesettings  mobile app plugin settings

     * @return string the key

     * @since Moodle 3.9

     */

    public static function get_qrlogin_key(stdClass $mobilesettings) {

        global $USER;

        // Delete previous keys.

        delete_user_key('tool_mobile/qrlogin', $USER->id);

        // Create a new key.

        $iprestriction = !empty($mobilesettings->qrsameipcheck) ? getremoteaddr(null) : null;

        $qrkeyttl = !empty($mobilesettings->qrkeyttl) ? $mobilesettings->qrkeyttl : self::LOGIN_QR_KEY_TTL;

        $validuntil = time() + $qrkeyttl;

        return create_user_key('tool_mobile/qrlogin', $USER->id, null, $iprestriction, $validuntil);

    }

    /**

     * Get a list of the Mobile app features.

     *

     * @return array array with the features grouped by theirs ubication in the app.

     * @since Moodle 3.3

     */

    public static function get_features_list() {

        global $CFG;

        require_once($CFG->libdir . '/authlib.php');

        $general = new lang_string('general');

        $mainmenu = new lang_string('mainmenu', 'tool_mobile');

        $course = new lang_string('course');

        $modules = new lang_string('managemodules');

        $blocks = new lang_string('blocks');

        $useraccount = new lang_string('useraccount');

        $participants = new lang_string('participants');

        $files = new lang_string('files');

        $remoteaddons = new lang_string('remoteaddons', 'tool_mobile');

        $identityproviders = new lang_string('oauth2identityproviders', 'tool_mobile');

        $availablemods = core_plugin_manager::instance()->get_plugins_of_type('mod');

        $coursemodules = array();

        $appsupportedmodules = array(

            'assign', 'bigbluebuttonbn', 'book', 'chat', 'choice', 'data', 'feedback', 'folder', 'forum', 'glossary', 'h5pactivity',

            'imscp', 'label', 'lesson', 'lti', 'page', 'quiz', 'resource', 'scorm', 'survey', 'url', 'wiki', 'workshop');

        foreach ($availablemods as $mod) {

            if (in_array($mod->name, $appsupportedmodules)) {

                $coursemodules['$mmCourseDelegate_mmaMod' . ucfirst($mod->name)] = $mod->displayname;

            }

        }

        asort($coursemodules);

        $remoteaddonslist = array();

        $mobileplugins = self::get_plugins_supporting_mobile();

        foreach ($mobileplugins as $plugin) {

            $displayname = core_plugin_manager::instance()->plugin_name($plugin['component']) . " - " . $plugin['addon'];

            $remoteaddonslist['sitePlugin_' . $plugin['component'] . '_' . $plugin['addon']] = $displayname;

        }

        // Display blocks.

        $availableblocks = core_plugin_manager::instance()->get_plugins_of_type('block');

        $courseblocks = array();

        $appsupportedblocks = array(

            'activity_modules' => 'CoreBlockDelegate_AddonBlockActivityModules',

            'activity_results' => 'CoreBlockDelegate_AddonBlockActivityResults',

            'site_main_menu' => 'CoreBlockDelegate_AddonBlockSiteMainMenu',

            'myoverview' => 'CoreBlockDelegate_AddonBlockMyOverview',

            'course_list' => 'CoreBlockDelegate_AddonBlockCourseList',

            'timeline' => 'CoreBlockDelegate_AddonBlockTimeline',

            'recentlyaccessedcourses' => 'CoreBlockDelegate_AddonBlockRecentlyAccessedCourses',

            'starredcourses' => 'CoreBlockDelegate_AddonBlockStarredCourses',

            'recentlyaccesseditems' => 'CoreBlockDelegate_AddonBlockRecentlyAccessedItems',

            'badges' => 'CoreBlockDelegate_AddonBlockBadges',

            'blog_menu' => 'CoreBlockDelegate_AddonBlockBlogMenu',

            'blog_recent' => 'CoreBlockDelegate_AddonBlockBlogRecent',

            'blog_tags' => 'CoreBlockDelegate_AddonBlockBlogTags',

            'calendar_month' => 'CoreBlockDelegate_AddonBlockCalendarMonth',

            'calendar_upcoming' => 'CoreBlockDelegate_AddonBlockCalendarUpcoming',

            'comments' => 'CoreBlockDelegate_AddonBlockComments',

            'completionstatus' => 'CoreBlockDelegate_AddonBlockCompletionStatus',

            'feedback' => 'CoreBlockDelegate_AddonBlockFeedback',

            'globalsearch' => 'CoreBlockDelegate_AddonBlockGlobalSearch',

            'glossary_random' => 'CoreBlockDelegate_AddonBlockGlossaryRandom',

            'html' => 'CoreBlockDelegate_AddonBlockHtml',

            'lp' => 'CoreBlockDelegate_AddonBlockLp',

            'news_items' => 'CoreBlockDelegate_AddonBlockNewsItems',

            'online_users' => 'CoreBlockDelegate_AddonBlockOnlineUsers',

            'private_files' => 'CoreBlockDelegate_AddonBlockPrivateFiles',

            'recent_activity' => 'CoreBlockDelegate_AddonBlockRecentActivity',

            'rss_client' => 'CoreBlockDelegate_AddonBlockRssClient',

            'search_forums' => 'CoreBlockDelegate_AddonBlockSearchForums',

            'selfcompletion' => 'CoreBlockDelegate_AddonBlockSelfCompletion',

            'tags' => 'CoreBlockDelegate_AddonBlockTags',

        );

        foreach ($availableblocks as $block) {

            if (isset($appsupportedblocks[$block->name])) {

                $courseblocks[$appsupportedblocks[$block->name]] = $block->displayname;

            }

        }

        asort($courseblocks);

        $features = array(

            "$general" => array(

                'NoDelegate_CoreOffline' => new lang_string('offlineuse', 'tool_mobile'),

                'NoDelegate_SiteBlocks' => new lang_string('blocks'),

                'NoDelegate_CoreComments' => new lang_string('comments'),

                'NoDelegate_CoreRating' => new lang_string('ratings', 'rating'),

                'NoDelegate_CoreTag' => new lang_string('tags'),

                '$mmLoginEmailSignup' => new lang_string('startsignup'),

                'NoDelegate_ForgottenPassword' => new lang_string('forgotten'),

                'NoDelegate_ResponsiveMainMenuItems' => new lang_string('responsivemainmenuitems', 'tool_mobile'),

                'NoDelegate_H5POffline' => new lang_string('h5poffline', 'tool_mobile'),

                'NoDelegate_DarkMode' => new lang_string('darkmode', 'tool_mobile'),

                'CoreFilterDelegate' => new lang_string('type_filter_plural', 'plugin'),

                'CoreReportBuilderDelegate' => new lang_string('reportbuilder', 'core_reportbuilder'),

                'NoDelegate_CoreUserSupport' => new lang_string('contactsitesupport', 'admin'),

                'NoDelegate_GlobalSearch' => new lang_string('globalsearch', 'search'),

            ),

            "$mainmenu" => array(

                '$mmSideMenuDelegate_mmaFrontpage' => new lang_string('sitehome'),

                'CoreMainMenuDelegate_CoreCoursesDashboard' => new lang_string('myhome'),

                '$mmSideMenuDelegate_mmCourses' => new lang_string('mycourses'),

                '$mmSideMenuDelegate_mmaMessages' => new lang_string('messages', 'message'),

                '$mmSideMenuDelegate_mmaNotifications' => new lang_string('notifications', 'message'),

                '$mmSideMenuDelegate_mmaCalendar' => new lang_string('calendar', 'calendar'),

                'CoreMainMenuDelegate_AddonBlog' => new lang_string('blog', 'blog'),

                'CoreMainMenuDelegate_CoreTag' => new lang_string('tags'),

                'CoreMainMenuDelegate_QrReader' => new lang_string('scanqrcode', 'tool_mobile'),

            ),

            "$useraccount" => array(

                '$mmSideMenuDelegate_mmaGrades' => new lang_string('grades', 'grades'),

                '$mmSideMenuDelegate_mmaFiles' => new lang_string('files'),

                'CoreUserDelegate_AddonBadges:account' => new lang_string('badges', 'badges'),

                'CoreUserDelegate_AddonBlog:account' => new lang_string('blog', 'blog'),

                '$mmSideMenuDelegate_mmaCompetency' => new lang_string('myplans', 'tool_lp'),

                'CoreUserDelegate_CorePolicy' => new lang_string('policiesagreements', 'tool_policy'),

                'CoreUserDelegate_CoreDataPrivacy' => new lang_string('pluginname', 'tool_dataprivacy'),

                'NoDelegate_SwitchAccount' => new lang_string('switchaccount', 'tool_mobile'),

            ),

            "$course" => array(

                '$mmCoursesDelegate_mmaParticipants' => new lang_string('participants'),

                '$mmCoursesDelegate_mmaGrades' => new lang_string('grades', 'grades'),

                '$mmCoursesDelegate_mmaCompetency' => new lang_string('competencies', 'competency'),

                '$mmCoursesDelegate_mmaNotes' => new lang_string('notes', 'notes'),

                '$mmCoursesDelegate_mmaCourseCompletion' => new lang_string('coursecompletion', 'completion'),

                'NoDelegate_CourseBlocks' => new lang_string('blocks'),

                'CoreCourseOptionsDelegate_AddonBlog' => new lang_string('blog', 'blog'),

                '$mmCoursesDelegate_search' => new lang_string('search'),

                'NoDelegate_CoreCourseDownload' => new lang_string('downloadcourse', 'tool_mobile'),

                'NoDelegate_CoreCoursesDownload' => new lang_string('downloadcourses', 'tool_mobile'),

            ),

            "$participants" => array(

                '$mmUserDelegate_mmaGrades:viewGrades' => new lang_string('grades', 'grades'),

                '$mmUserDelegate_mmaCourseCompletion:viewCompletion' => new lang_string('coursecompletion', 'completion'),

                '$mmUserDelegate_mmaBadges' => new lang_string('badges', 'badges'),

                '$mmUserDelegate_mmaNotes:addNote' => new lang_string('notes', 'notes'),

                'CoreUserDelegate_AddonBlog:blogs' => new lang_string('blog', 'blog'),

                '$mmUserDelegate_mmaCompetency:learningPlan' => new lang_string('competencies', 'competency'),

                '$mmUserDelegate_mmaMessages:sendMessage' => new lang_string('sendmessage', 'message'),

                '$mmUserDelegate_picture' => new lang_string('userpic'),

            ),

            "$files" => array(

                'files_privatefiles' => new lang_string('privatefiles'),

                'files_sitefiles' => new lang_string('sitefiles'),

                'files_upload' => new lang_string('upload'),

            ),

            "$modules" => $coursemodules,

            "$blocks" => $courseblocks,

        );

        if (!empty($remoteaddonslist)) {

            $features["$remoteaddons"] = $remoteaddonslist;

        }

        if (!empty($availablemods['lti'])) {

            $ltidisplayname = $availablemods['lti']->displayname;

            $features["$ltidisplayname"]['CoreCourseModuleDelegate_AddonModLti:launchViaSite'] =

                new lang_string('launchviasiteinbrowser', 'tool_mobile');

        }

        // Display OAuth 2 identity providers.

        if (is_enabled_auth('oauth2')) {

            $identityproviderslist = array();

            $idps = \auth_plugin_base::get_identity_providers(['oauth2']);

            foreach ($idps as $idp) {

                // Only add identity providers that have an ID.

                $id = isset($idp['url']) ? $idp['url']->get_param('id') : null;

                if ($id != null) {

                    $identityproviderslist['NoDelegate_IdentityProvider_' . $id] = $idp['name'];

                }

            }

            if (!empty($identityproviderslist)) {

                $features["$identityproviders"] = array();

                if (count($identityproviderslist) > 1) {

                    // Include an option to disable them all.

                    $features["$identityproviders"]['NoDelegate_IdentityProviders'] = new lang_string('all');

                }

                $features["$identityproviders"] = array_merge($features["$identityproviders"], $identityproviderslist);

            }

        }

        return $features;

    }

    /**

     * This function check the current site for potential configuration issues that may prevent the mobile app to work.

     *

     * @return array list of potential issues

     * @since  Moodle 3.4

     */

    public static function get_potential_config_issues() {

        global $CFG;

        require_once($CFG->dirroot . "/lib/filelib.php");

        require_once($CFG->dirroot . '/message/lib.php');

        $warnings = array();

        if (is_https()) {

            $curl = new curl();

            // Return certificate information and verify the certificate.

            $curl->setopt(array('CURLOPT_CERTINFO' => 1, 'CURLOPT_SSL_VERIFYPEER' => true));

            // Check https using a page not redirecting or returning exceptions.

            $curl->head("$CFG->wwwroot/$CFG->admin/tool/mobile/mobile.webmanifest.php");

            $info = $curl->get_info();

            // Check the certificate is not self-signed or has an untrusted-root.

            // This may be weak in some scenarios (when the curl SSL verifier is outdated).

            if (empty($info['http_code']) || empty($info['certinfo'])) {

                $warnings[] = ['selfsignedoruntrustedcertificatewarning', 'tool_mobile'];

            } else {

                $timenow = time();

                $infokeys = array_keys($info['certinfo']);

                $lastkey = end($infokeys);

                if (count($info['certinfo']) == 1) {

                    // This will work in a normal browser because it will complete the chain, but not in a mobile app.

                    $warnings[] = ['invalidcertificatechainwarning', 'tool_mobile'];

                }

                foreach ($info['certinfo'] as $key => $cert) {

                    // Convert to lower case the keys, some OS/curl implementations differ.

                    $cert = array_change_key_case($cert, CASE_LOWER);

                    // Due to a bug in certain curl/openssl versions the signature algorithm isn't always correctly parsed.

                    // See https://github.com/curl/curl/issues/3706 for reference.

                    if (!array_key_exists('signature algorithm', $cert)) {

                        // The malformed field that does contain the algorithm we're looking for looks like the following:

                        // <WHITESPACE>Signature Algorithm: <ALGORITHM><CRLF><ALGORITHM>.

                        preg_match('/\s+Signature Algorithm: (?<algorithm>[^\s]+)/', $cert['public key algorithm'], $matches);

                        $signaturealgorithm = $matches['algorithm'] ?? '';

                    } else {

                        $signaturealgorithm = $cert['signature algorithm'];

                    }

                    // Check if the signature algorithm is weak (Android won't work with SHA-1).

                    if ($key != $lastkey &&

                            ($signaturealgorithm == 'sha1WithRSAEncryption' || $signaturealgorithm == 'sha1WithRSA')) {

                        $warnings['insecurealgorithmwarning'] = ['insecurealgorithmwarning', 'tool_mobile'];

                    }

                    // Check certificate start date.

                    if (strtotime($cert['start date']) > $timenow) {

                        $warnings['invalidcertificatestartdatewarning'] = ['invalidcertificatestartdatewarning', 'tool_mobile'];

                    }

                    // Check certificate end date.

                    if (strtotime($cert['expire date']) < $timenow) {

                        $warnings['invalidcertificateexpiredatewarning'] = ['invalidcertificateexpiredatewarning', 'tool_mobile'];

                    }

                }

            }

        } else {

            // Warning for non https sites.

            $warnings[] = ['nohttpsformobilewarning', 'admin'];

        }

        // Check ADOdb debug enabled.

        if (get_config('auth_db', 'debugauthdb') || get_config('enrol_database', 'debugdb')) {

            $warnings[] = ['adodbdebugwarning', 'tool_mobile'];

        }

        // Check display errors on.

        if (!empty($CFG->debugdisplay)) {

            $warnings[] = ['displayerrorswarning', 'tool_mobile'];

        }

        // Check mobile notifications.

        $processors = get_message_processors();

        $enabled = false;

        foreach ($processors as $processor => $status) {

            if ($processor == 'airnotifier' && $status->enabled) {

                $enabled = true;

            }

        }

        if (!$enabled) {

            $warnings[] = ['mobilenotificationsdisabledwarning', 'tool_mobile'];

        }

        return $warnings;

    }

    /**

     * Generates a QR code with the site URL or for automatic login from the mobile app.

     *

     * @param  stdClass $mobilesettings tool_mobile settings

     * @return string base64 data image contents, null if qr disabled

     */

    public static function generate_login_qrcode(stdClass $mobilesettings) {

        global $CFG, $USER;

        if ($mobilesettings->qrcodetype == static::QR_CODE_DISABLED) {

            return null;

        }

        $urlscheme = !empty($mobilesettings->forcedurlscheme) ? $mobilesettings->forcedurlscheme : 'moodlemobile';

        $data = $urlscheme . '://' . $CFG->wwwroot;

        if ($mobilesettings->qrcodetype == static::QR_CODE_LOGIN) {

            $qrloginkey = static::get_qrlogin_key($mobilesettings);

            $data .= '?qrlogin=' . $qrloginkey . '&userid=' . $USER->id;

        }

        $qrcode = new core_qrcode($data);

        $imagedata = 'data:image/png;base64,' . base64_encode($qrcode->getBarcodePngData(5, 5));

        return $imagedata;

    }

    /**

     * Gets Moodle app plan subscription information for the current site as it is returned by the Apps Portal.

     *

     * @return array Subscription information

     */

    public static function get_subscription_information(): ?array {

        global $CFG;

        // Use session cache to prevent multiple requests.

        $cache = \cache::make('tool_mobile', 'subscriptiondata');

        $subscriptiondata = $cache->get(0);

        if ($subscriptiondata !== false) {

            return $subscriptiondata;

        }

        $mobilesettings = get_config('tool_mobile');

        // To validate that the requests come from this site we need to send some private information that only is known by the

        // Moodle Apps portal or the Sites registration database.

        $credentials = [];

        if (!empty($CFG->airnotifieraccesskey)) {

            $credentials[] = ['type' => 'airnotifieraccesskey', 'value' => $CFG->airnotifieraccesskey];

        }

        if (\core\hub\registration::is_registered()) {

            $credentials[] = ['type' => 'siteid', 'value' => $CFG->siteidentifier];

        }

        // Generate a hash key for validating that the request is coming from this site via WS.

        $key = complex_random_string(32);

        $sitesubscriptionkey = json_encode(['validuntil' => time() + 10 * MINSECS, 'key' => $key]);

        set_config('sitesubscriptionkey', $sitesubscriptionkey, 'tool_mobile');

        $credentials[] = ['type' => 'sitesubscriptionkey', 'value' => $key];

        // Parameters for the WebService returning site information.

        $androidappid = empty($mobilesettings->androidappid) ? static::DEFAULT_ANDROID_APP_ID : $mobilesettings->androidappid;

        $iosappid = empty($mobilesettings->iosappid) ? static::DEFAULT_IOS_APP_ID : $mobilesettings->iosappid;

        $fnparams = (object) [

            'siteurl' => $CFG->wwwroot,

            'appids' => [$androidappid, $iosappid],

            'credentials' => $credentials,

        ];

        // Prepare the arguments for a request to the AJAX nologin endpoint.

        $args = [

            (object) [

                'index' => 0,

                'methodname' => 'local_apps_get_site_info',

                'args' => $fnparams,

            ]

        ];

        // Ask the Moodle Apps Portal for the subscription information.

        $curl = new curl();

        $curl->setopt(array('CURLOPT_TIMEOUT' => 10, 'CURLOPT_CONNECTTIMEOUT' => 10));

        $serverurl = static::MOODLE_APPS_PORTAL_URL . "/lib/ajax/service-nologin.php";

        $query = 'args=' . urlencode(json_encode($args));

        $wsresponse = @json_decode($curl->post($serverurl, $query), true);

        $info = $curl->get_info();

        if ($curlerrno = $curl->get_errno()) {

            // CURL connection error.

            debugging("Unexpected response from the Moodle Apps Portal server, CURL error number: $curlerrno");

            return null;

        } else if ($info['http_code'] != 200) {

            // Unexpected error from server.

            debugging('Unexpected response from the Moodle Apps Portal server, HTTP code:' . $info['httpcode']);

            return null;

        } else if (!empty($wsresponse[0]['error'])) {

            // Unexpected error from Moodle Apps Portal.

            debugging('Unexpected response from the Moodle Apps Portal server:' . json_encode($wsresponse[0]));

            return null;

        } else if (empty($wsresponse[0]['data'])) {

            debugging('Unexpected response from the Moodle Apps Portal server:' . json_encode($wsresponse));

            return null;

        }

        $cache->set(0, $wsresponse[0]['data']);

        return $wsresponse[0]['data'];

    }

}