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/>.

namespace core_communication;

use context;

use stdClass;

/**

 * Helper method for communication.

 *

 * @package    core_communication

 * @copyright  2023 Safat Shahin <safat.shahin@moodle.com>

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

 */

class helper {

    /**

     * Load the communication instance for group id.

     *

     * @param int $groupid The group id

     * @param context $context The context, to make sure any instance using group can load the communication instance

     * @return api The communication instance.

     */

    public static function load_by_group(int $groupid, context $context): api {

        return \core_communication\api::load_by_instance(

            context: $context,

            component: constants::GROUP_COMMUNICATION_COMPONENT,

            instancetype: constants::GROUP_COMMUNICATION_INSTANCETYPE,

            instanceid: $groupid,

        );

    }

    /**

     * Load the communication instance for course id.

     *

     * @param int $courseid The course id

     * @param \context $context The context

     * @param string|null $provider The provider name

     * @return api The communication instance

     */

    public static function load_by_course(

        int $courseid,

        \context $context,

        ?string $provider = null,

    ): api {

        return \core_communication\api::load_by_instance(

            context: $context,

            component: constants::COURSE_COMMUNICATION_COMPONENT,

            instancetype: constants::COURSE_COMMUNICATION_INSTANCETYPE,

            instanceid: $courseid,

            provider: $provider,

        );

    }

    /**

     * Communication api call to create room for a group if course has group mode enabled.

     *

     * @param int $courseid The course id.

     * @return stdClass

     */

    public static function get_course(int $courseid): stdClass {

        global $DB;

        return $DB->get_record(

            table: 'course',

            conditions: ['id' => $courseid],

            strictness: MUST_EXIST,

        );

    }

    /**

     * Is group mode enabled for the course.

     *

     * @param stdClass $course The course object

     */

    public static function is_group_mode_enabled_for_course(stdClass $course): bool {

        // If the communication subsystem is not enabled then just ignore.

        if (!api::is_available()) {

            return false;

        }

        $groupmode = $course->groupmode ?? get_course(courseid: $course->id)->groupmode;

        return (int)$groupmode !== NOGROUPS;

    }

    /**

     * Helper to update room membership according to action passed.

     * This method will help reduce a large amount of duplications of code in different places in core.

     *

     * @param \stdClass $course The course object.

     * @param array $userids The user ids to add to the communication room.

     * @param string $memberaction The action to perform on the communication room.

     */

    public static function update_course_communication_room_membership(

        \stdClass $course,

        array $userids,

        string $memberaction,

    ): void {

        // If the communication subsystem is not enabled then just ignore.

        if (!api::is_available()) {

            return;

        }

        // Validate communication api action.

        $roomuserprovider = new \ReflectionClass(room_user_provider::class);

        if (!$roomuserprovider->hasMethod($memberaction)) {

            throw new \coding_exception('Invalid action provided.');

        }

        $coursecontext = \context_course::instance(courseid: $course->id);

        $communication = self::load_by_course(

            courseid: $course->id,

            context: $coursecontext,

        );

        // Check we have communication correctly set up before proceeding.

        if ($communication->get_processor() === null) {

            return;

        }

        // Get the group mode for this course.

        $groupmode = $course->groupmode ?? get_course(courseid: $course->id)->groupmode;

        if ((int)$groupmode === NOGROUPS) {

            // If group mode is not set, then just handle the update normally for these users.

            $communication->$memberaction($userids);

        } else {

            // If group mode is set, then handle the update for these users with repect to the group they are in.

            $coursegroups = groups_get_all_groups(courseid: $course->id);

            $usershandled = [];

            // Filter all the users that have the capability to access all groups.

            $allaccessgroupusers = self::get_users_has_access_to_all_groups(

                userids: $userids,

                courseid: $course->id,

            );

            foreach ($coursegroups as $coursegroup) {

                // Get all group members.

                $groupmembers = groups_get_members(groupid: $coursegroup->id, fields: 'u.id');

                $groupmembers = array_column($groupmembers, 'id');

                // Find the common user ids between the group members and incoming userids.

                $groupuserstohandle = array_intersect(

                    $groupmembers,

                    $userids,

                );

                // Add users who have the capability to access this group (and haven't been added already).

                foreach ($allaccessgroupusers as $allaccessgroupuser) {

                    if (!in_array($allaccessgroupuser, $groupuserstohandle, true)) {

                        $groupuserstohandle[] = $allaccessgroupuser;

                    }

                }

                // Keep track of the users we have handled already.

                $usershandled = array_merge($usershandled, $groupuserstohandle);

                // Let's check if we need to add/remove members from room because of a role change.

                // First, get all the instance users for this group.

                $communication = self::load_by_group(

                    groupid: $coursegroup->id,

                    context: $coursecontext,

                );

                $instanceusers = $communication->get_processor()->get_all_userids_for_instance();

                // The difference between the instance users and the group members are the ones we want to check.

                $roomuserstocheck = array_diff(

                    $instanceusers,

                    $groupmembers

                );

                if (!empty($roomuserstocheck)) {

                    // Check if they still have the capability to keep their access in the room.

                    $userslostcaps = array_diff(

                        $roomuserstocheck,

                        self::get_users_has_access_to_all_groups(

                            userids: $roomuserstocheck,

                            courseid: $course->id,

                        ),

                    );

                    // Remove users who no longer have the capability.

                    if (!empty($userslostcaps)) {

                        $communication->remove_members_from_room(userids: $userslostcaps);

                    }

                }

                // Check if we have to add any room members who have gained the capability.

                $usersgainedcaps = array_diff(

                    $allaccessgroupusers,

                    $instanceusers,

                );

                // If we have users, add them to the room.

                if (!empty($usersgainedcaps)) {

                    $communication->add_members_to_room(userids: $usersgainedcaps);

                }

                // Finally, trigger the update task for the users who need to be handled.

                $communication->$memberaction($groupuserstohandle);

            }

            // If the user was not in any group, but an update/remove action was requested for the user,

            // then the user must have had a role with the capablity, but made a regular user.

            $usersnothandled = array_diff($userids, $usershandled);

            // These users are not handled and not in any group, so logically these users lost their permission to stay in the room.

            foreach ($coursegroups as $coursegroup) {

                $communication = self::load_by_group(

                    groupid: $coursegroup->id,

                    context: $coursecontext,

                );

                $communication->remove_members_from_room(userids: $usersnothandled);

            }

        }

    }

    /**

     * Get users with the capability to access all groups.

     *

     * @param array $userids user ids to check the permission

     * @param int $courseid course id

     * @return array of userids

     */

    public static function get_users_has_access_to_all_groups(

        array $userids,

        int $courseid

    ): array {

        $allgroupsusers = [];

        $context = \context_course::instance(courseid: $courseid);

        foreach ($userids as $userid) {

            if (

                has_capability(

                    capability: 'moodle/site:accessallgroups',

                    context: $context,

                    user: $userid,

                )

            ) {

                $allgroupsusers[] = $userid;

            }

        }

        return $allgroupsusers;

    }

    /**

     * Get the course communication url according to course setup.

     *

     * @param stdClass $course The course object.

     * @return string The communication room url.

     */

    public static function get_course_communication_url(stdClass $course): string {

        // If it's called from site context, then just return.

        if ($course->id === SITEID) {

            return '';

        }

        // If the communication subsystem is not enabled then just ignore.

        if (!api::is_available()) {

            return '';

        }

        $url = '';

        // Get the group mode for this course.

        $groupmode = $course->groupmode ?? get_course(courseid: $course->id)->groupmode;

        $coursecontext = \context_course::instance(courseid: $course->id);

        // If group mode is not set then just handle the course communication for these users.

        if ((int)$groupmode === NOGROUPS) {

            $communication = self::load_by_course(

                courseid: $course->id,

                context: $coursecontext,

            );

            $url = $communication->get_communication_room_url();

        } else {

            // If group mode is set then handle the group communication rooms for these users.

            $coursegroups = groups_get_all_groups(courseid: $course->id);

            $numberofgroups = count($coursegroups);

            // If no groups available, nothing to show.

            if ($numberofgroups === 0) {

                return '';

            }

            $readygroups = [];

            foreach ($coursegroups as $coursegroup) {

                $communication = self::load_by_group(

                    groupid: $coursegroup->id,

                    context: $coursecontext,

                );

                $roomstatus = $communication->get_communication_room_url() ? 'ready' : 'pending';

                if ($roomstatus === 'ready') {

                    $readygroups[$communication->get_processor()->get_id()] = $communication->get_communication_room_url();

                }

            }

            if (!empty($readygroups)) {

                $highestkey = max(array_keys($readygroups));

                $url = $readygroups[$highestkey];

            }

        }

        return empty($url) ? '' : $url;

    }

    /**

     * Get the enrolled users for course.

     *

     * @param stdClass $course The course object.

     * @param bool $onlyactive Only enrolments that are active (e.g. not suspended).

     * @return array

     */

    public static function get_enrolled_users_for_course(stdClass $course, bool $onlyactive = true): array {

        global $CFG;

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

        return array_column(

            enrol_get_course_users(courseid: $course->id, onlyactive: $onlyactive),

            'id',

        );

    }

    /**

     * Get the course communication status notification for course.

     *

     * @param \stdClass $course The course object.

     */

    public static function get_course_communication_status_notification(\stdClass $course): void {

        // If the communication subsystem is not enabled then just ignore.

        if (!api::is_available()) {

            return;

        }

        // Get the group mode for this course.

        $groupmode = $course->groupmode ?? get_course(courseid: $course->id)->groupmode;

        $coursecontext = \context_course::instance(courseid: $course->id);

        // If group mode is not set then just handle the course communication for these users.

        if ((int)$groupmode === NOGROUPS) {

            $communication = self::load_by_course(

                courseid: $course->id,

                context: $coursecontext,

            );

            $communication->show_communication_room_status_notification();

        } else {

            // If group mode is set then handle the group communication rooms for these users.

            $coursegroups = groups_get_all_groups(courseid: $course->id);

            $numberofgroups = count($coursegroups);

            // If no groups available, nothing to show.

            if ($numberofgroups === 0) {

                return;

            }

            $numberofreadygroups = 0;

            foreach ($coursegroups as $coursegroup) {

                $communication = self::load_by_group(

                    groupid: $coursegroup->id,

                    context: $coursecontext,

                );

                $roomstatus = $communication->get_communication_room_url() ? 'ready' : 'pending';

                switch ($roomstatus) {

                    case 'ready':

                        $numberofreadygroups ++;

                        break;

                    case 'pending':

                        $pendincommunicationobject = $communication;

                        break;

                }

            }

            if ($numberofgroups === $numberofreadygroups) {

                $communication->show_communication_room_status_notification();

            } else {

                $pendincommunicationobject->show_communication_room_status_notification();

            }

        }

    }

    /**

     * Update course communication according to course data.

     * Course can have course or group rooms. Group mode enabling will create rooms for groups.

     *

     * @param stdClass $course The course data

     * @param bool $changesincoursecat Whether the course moved to a different category

     */

    public static function update_course_communication_instance(

        stdClass $course,

        bool $changesincoursecat

    ): void {

        // If the communication subsystem is not enabled then just ignore.

        if (!api::is_available()) {

            return;

        }

        // Check if provider is selected.

        $provider = $course->selectedcommunication ?? null;

        // If the course moved to hidden category, set provider to none.

        if ($changesincoursecat && empty($course->visible)) {

            $provider = processor::PROVIDER_NONE;

        }

        // Get the course context.

        $coursecontext = \context_course::instance(courseid: $course->id);

        // Get the course image.

        $courseimage = course_get_courseimage(course: $course);

        // Get the course communication instance.

        $coursecommunication = self::load_by_course(

            courseid: $course->id,

            context: $coursecontext,

        );

        // Attempt to get the communication provider if it wasn't provided in the data.

        if (empty($provider)) {

            $provider = $coursecommunication->get_provider();

        }

        $roomnameidenfier = $provider . 'roomname';

        // Determine the communication room name if none was provided and add it to the course data.

        if (empty($course->$roomnameidenfier)) {

            $course->$roomnameidenfier = $coursecommunication->get_room_name();

            if (empty($course->$roomnameidenfier)) {

                $course->$roomnameidenfier = $course->fullname ?? get_course($course->id)->fullname;

            }

        }

        // List of enrolled users for course communication.

        $enrolledusers = self::get_enrolled_users_for_course(course: $course);

        // Check for group mode, we will have to get the course data again as the group info is not always in the object.

        $groupmode = $course->groupmode ?? get_course(courseid: $course->id)->groupmode;

        // If group mode is disabled, get the communication information for creating room for a course.

        if ((int)$groupmode === NOGROUPS) {

            // Remove all the members from active group rooms if there is any.

            $coursegroups = groups_get_all_groups(courseid: $course->id);

            foreach ($coursegroups as $coursegroup) {

                $communication = self::load_by_group(

                    groupid: $coursegroup->id,

                    context: $coursecontext,

                );

                // Remove the members from the group room.

                $communication->remove_all_members_from_room();

                // Now delete the group room.

                $communication->update_room(active: processor::PROVIDER_INACTIVE);

            }

            // Now create/update the course room.

            $communication = self::load_by_course(

                courseid: $course->id,

                context: $coursecontext,

            );

            $communication->configure_room_and_membership_by_provider(

                provider: $provider,

                instance: $course,

                communicationroomname: $course->$roomnameidenfier,

                users: $enrolledusers,

                instanceimage: $courseimage,

            );

        } else {

            // Update the group communication instances.

            self::update_group_communication_instances_for_course(

                course: $course,

                provider: $provider,

            );

            // Remove all the members for the course room if instance available.

            $communication = self::load_by_course(

                courseid: $course->id,

                context: $coursecontext,

            );

            // Now handle the course communication according to the provider.

            $communication->configure_room_and_membership_by_provider(

                provider: $provider,

                instance: $course,

                communicationroomname: $course->$roomnameidenfier,

                users: $enrolledusers,

                instanceimage: $courseimage,

                queue: false,

            );

            // As the course is in group mode, make sure no users are in the course room.

            $communication->reload();

            $communication->remove_all_members_from_room();

        }

    }

    /**

     * Update the group communication instances.

     *

     * @param stdClass $course The course object.

     * @param string $provider The provider name.

     */

    public static function update_group_communication_instances_for_course(

        stdClass $course,

        string $provider,

    ): void {

        $coursegroups = groups_get_all_groups(courseid: $course->id);

        $coursecontext = \context_course::instance(courseid: $course->id);

        $allaccessgroupusers = self::get_users_has_access_to_all_groups(

            userids: self::get_enrolled_users_for_course(course: $course),

            courseid: $course->id,

        );

        foreach ($coursegroups as $coursegroup) {

            $groupusers = array_column(

                groups_get_members(groupid: $coursegroup->id),

                'id',

            );

            // Filter out users who are not active in this course.

            $enrolledusers = self::get_enrolled_users_for_course(course: $course);

            $groupuserstoadd = array_intersect($groupusers, $enrolledusers);

            foreach ($allaccessgroupusers as $allaccessgroupuser) {

                if (!in_array($allaccessgroupuser, $groupuserstoadd, true)) {

                    $groupuserstoadd[] = $allaccessgroupuser;

                }

            }

            // Now create/update the group room.

            $communication = self::load_by_group(

                groupid: $coursegroup->id,

                context: $coursecontext,

            );

            $roomnameidenfier = $provider . 'roomname';

            $communicationroomname = self::format_group_room_name(

                baseroomname: $course->$roomnameidenfier,

                groupname: $coursegroup->name,

            );

            $communication->configure_room_and_membership_by_provider(

                provider: $provider,

                instance: $course,

                communicationroomname: $communicationroomname,

                users: $groupuserstoadd,

            );

        }

    }

    /**

     * Format a group communication room name with the following syntax: 'Group A (Course 1)'.

     *

     * @param string $baseroomname The base room name.

     * @param string $groupname The group name.

     */

    public static function format_group_room_name(

        string $baseroomname,

        string $groupname

    ): string {

        return get_string('communicationgrouproomnameformat', 'core_communication', [

            'groupname' => $groupname,

            'baseroomname' => $baseroomname,

        ]);

    }

}