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/>.

/**

 * Contains helper class for the message area.

 *

 * @package    core_message

 * @copyright  2016 Mark Nelson <markn@moodle.com>

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

 */

namespace core_message;

use DOMDocument;

defined('MOODLE_INTERNAL') || die();

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

/**

 * Helper class for the message area.

 *

 * @copyright  2016 Mark Nelson <markn@moodle.com>

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

 */

class helper {

    /**

     * @deprecated since 3.6

     */

    public static function get_messages() {

        throw new \coding_exception('\core_message\helper::get_messages has been removed.');

    }

    /**

     * Helper function to retrieve conversation messages.

     *

     * @param  int $userid The current user.

     * @param  int $convid The conversation identifier.

     * @param  int $timedeleted The time the message was deleted

     * @param  int $limitfrom Return a subset of records, starting at this point (optional).

     * @param  int $limitnum Return a subset comprising this many records in total (optional, required if $limitfrom is set).

     * @param  string $sort The column name to order by including optionally direction.

     * @param  int $timefrom The time from the message being sent.

     * @param  int $timeto The time up until the message being sent.

     * @return array of messages

     */

    public static function get_conversation_messages(int $userid, int $convid, int $timedeleted = 0, int $limitfrom = 0,

                                                     int $limitnum = 0, string $sort = 'timecreated ASC', int $timefrom = 0,

                                                     int $timeto = 0): array {

        global $DB;

        $sql = "SELECT m.id, m.useridfrom, m.subject, m.fullmessage, m.fullmessagehtml,

                       m.fullmessageformat, m.fullmessagetrust, m.smallmessage, m.timecreated,

                       mc.contextid, muaread.timecreated AS timeread

                  FROM {message_conversations} mc

            INNER JOIN {messages} m

                    ON m.conversationid = mc.id

             LEFT JOIN {message_user_actions} muaread

                    ON (muaread.messageid = m.id

                   AND muaread.userid = :userid1

                   AND muaread.action = :readaction)";

        $params = ['userid1' => $userid, 'readaction' => api::MESSAGE_ACTION_READ, 'convid' => $convid];

        if (empty($timedeleted)) {

            $sql .= " LEFT JOIN {message_user_actions} mua

                             ON (mua.messageid = m.id

                            AND mua.userid = :userid2

                            AND mua.action = :deleteaction

                            AND mua.timecreated is NOT NULL)";

        } else {

            $sql .= " INNER JOIN {message_user_actions} mua

                              ON (mua.messageid = m.id

                             AND mua.userid = :userid2

                             AND mua.action = :deleteaction

                             AND mua.timecreated = :timedeleted)";

            $params['timedeleted'] = $timedeleted;

        }

        $params['userid2'] = $userid;

        $params['deleteaction'] = api::MESSAGE_ACTION_DELETED;

        $sql .= " WHERE mc.id = :convid";

        if (!empty($timefrom)) {

            $sql .= " AND m.timecreated >= :timefrom";

            $params['timefrom'] = $timefrom;

        }

        if (!empty($timeto)) {

            $sql .= " AND m.timecreated <= :timeto";

            $params['timeto'] = $timeto;

        }

        if (empty($timedeleted)) {

            $sql .= " AND mua.id is NULL";

        }

        $sql .= " ORDER BY m.$sort";

        $messages = $DB->get_records_sql($sql, $params, $limitfrom, $limitnum);

        return $messages;

    }

    /**

     * Helper function to return a conversation messages with the involved members (only the ones

     * who have sent any of these messages).

     *

     * @param int $userid The current userid.

     * @param int $convid The conversation id.

     * @param array $messages The formated array messages.

     * @return array A conversation array with the messages and the involved members.

     */

    public static function format_conversation_messages(int $userid, int $convid, array $messages): array {

        global $USER;

        // Create the conversation array.

        $conversation = array(

            'id' => $convid,

        );

        // Store the messages.

        $arrmessages = array();

        foreach ($messages as $message) {

            // Store the message information.

            $msg = new \stdClass();

            $msg->id = $message->id;

            $msg->useridfrom = $message->useridfrom;

            $msg->text = message_format_message_text($message);

            $msg->timecreated = $message->timecreated;

            $arrmessages[] = $msg;

        }

        // Add the messages to the conversation.

        $conversation['messages'] = $arrmessages;

        // Get the users who have sent any of the $messages.

        $memberids = array_unique(array_map(function($message) {

            return $message->useridfrom;

        }, $messages));

        if (!empty($memberids)) {

            // Get members information.

            $conversation['members'] = self::get_member_info($userid, $memberids);

        } else {

            $conversation['members'] = array();

        }

        return $conversation;

    }

    /**

     * @deprecated since 3.6

     */

    public static function create_messages() {

        throw new \coding_exception('\core_message\helper::create_messages has been removed.');

    }

    /**

     * Helper function for creating a contact object.

     *

     * @param \stdClass $contact

     * @param string $prefix

     * @return \stdClass

     */

    public static function create_contact($contact, $prefix = '') {

        global $PAGE;

        // Create the data we are going to pass to the renderable.

        $userfields = \user_picture::unalias($contact, array('lastaccess'), $prefix . 'id', $prefix);

        $data = new \stdClass();

        $data->userid = $userfields->id;

        $data->useridfrom = null;

        $data->fullname = fullname($userfields);

        // Get the user picture data.

        $userpicture = new \user_picture($userfields);

        $userpicture->size = 1; // Size f1.

        $data->profileimageurl = $userpicture->get_url($PAGE)->out(false);

        $userpicture->size = 0; // Size f2.

        $data->profileimageurlsmall = $userpicture->get_url($PAGE)->out(false);

        // Store the message if we have it.

        $data->ismessaging = false;

        $data->lastmessage = null;

        $data->lastmessagedate = null;

        $data->messageid = null;

        if (isset($contact->smallmessage)) {

            $data->ismessaging = true;

            // Strip the HTML tags from the message for displaying in the contact area.

            $data->lastmessage = clean_param($contact->smallmessage, PARAM_NOTAGS);

            $data->lastmessagedate = $contact->timecreated;

            $data->useridfrom = $contact->useridfrom;

            if (isset($contact->messageid)) {

                $data->messageid = $contact->messageid;

            }

        }

        $data->isonline = null;

        $user = \core_user::get_user($data->userid);

        if (self::show_online_status($user)) {

            $data->isonline = self::is_online($userfields->lastaccess);

        }

        $data->isblocked = isset($contact->blocked) ? (bool) $contact->blocked : false;

        $data->isread = isset($contact->isread) ? (bool) $contact->isread : false;

        $data->unreadcount = isset($contact->unreadcount) ? $contact->unreadcount : null;

        $data->conversationid = $contact->conversationid ?? null;

        return $data;

    }

    /**

     * Helper function for checking if we should show the user's online status.

     *

     * @param \stdClass $user

     * @return boolean

     */

    public static function show_online_status($user) {

        global $CFG;

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

        if ($lastaccess = user_get_user_details($user, null, array('lastaccess'))) {

            if (isset($lastaccess['lastaccess'])) {

                return true;

            }

        }

        return false;

    }

    /**

     * Helper function for checking the time meets the 'online' condition.

     *

     * @param int $lastaccess

     * @return boolean

     */

    public static function is_online($lastaccess) {

        global $CFG;

        // Variable to check if we consider this user online or not.

        $timetoshowusers = 300; // Seconds default.

        if (isset($CFG->block_online_users_timetosee)) {

            $timetoshowusers = $CFG->block_online_users_timetosee * 60;

        }

        $time = time() - $timetoshowusers;

        return $lastaccess >= $time;

    }

    /**

     * Get providers preferences.

     *

     * @param array $providers

     * @param int $userid

     * @return \stdClass

     */

    public static function get_providers_preferences($providers, $userid) {

        $preferences = new \stdClass();

        // Get providers preferences.

        foreach ($providers as $provider) {

            $linepref = get_user_preferences('message_provider_' . $provider->component . '_' . $provider->name

                . '_enabled', '', $userid);

            if ($linepref == '') {

                continue;

            }

            $lineprefarray = explode(',', $linepref);

            $preferences->{$provider->component.'_'.$provider->name.'_enabled'} = [];

            foreach ($lineprefarray as $pref) {

                $preferences->{$provider->component.'_'.$provider->name.'_enabled'}[$pref] = 1;

            }

        }

        return $preferences;

    }

    /**

     * Requires the JS libraries for the toggle contact button.

     *

     * @return void

     */

    public static function togglecontact_requirejs() {

        global $PAGE;

        static $done = false;

        if ($done) {

            return;

        }

        $PAGE->requires->js_call_amd('core_message/toggle_contact_button', 'enhance', array('#toggle-contact-button'));

        $done = true;

    }

    /**

     * Returns the attributes to place on a contact button.

     *

     * @param object $user User object.

     * @param bool $iscontact

     * @param bool $displaytextlabel Instructs whether to display a text label.

     * @return array

     */

    public static function togglecontact_link_params($user, $iscontact = false, bool $displaytextlabel = true) {

        global $USER;

        $params = array(

            'data-currentuserid' => $USER->id,

            'data-userid' => $user->id,

            'data-is-contact' => $iscontact,

            'data-display-text-label' => $displaytextlabel,

            'id' => 'toggle-contact-button',

            'role' => 'button',

            'class' => 'ajax-contact-button',

        );

        return $params;

    }

    /**

     * Requires the JS libraries for the message user button.

     *

     * @return void

     */

    public static function messageuser_requirejs() {

        global $PAGE;

        static $done = false;

        if ($done) {

            return;

        }

        $PAGE->requires->js_call_amd('core_message/message_user_button', 'send', array('#message-user-button'));

        $done = true;

    }

    /**

     * Returns the attributes to place on the message user button.

     *

     * @param int $useridto

     * @return array

     */

    public static function messageuser_link_params(int $useridto): array {

        global $USER;

        return [

            'id' => 'message-user-button',

            'role' => 'button',

            'data-conversationid' => api::get_conversation_between_users([$USER->id, $useridto]),

            'data-userid' => $useridto,

        ];

    }

    /**

     * Returns the conversation hash between users for easy look-ups in the DB.

     *

     * @param array $userids

     * @return string

     */

    public static function get_conversation_hash(array $userids) {

        sort($userids);

        return sha1(implode('-', $userids));

    }

    /**

     * Returns the cache key for the time created value of the last message of this conversation.

     *

     * @param int $convid The conversation identifier.

     * @return string The key.

     */

    public static function get_last_message_time_created_cache_key(int $convid) {

        return $convid;

    }

    /**

     * Checks if legacy messages exist for a given user.

     *

     * @param int $userid

     * @return bool

     */

    public static function legacy_messages_exist($userid) {

        global $DB;

        $sql = "SELECT id

                  FROM {message} m

                 WHERE useridfrom = ?

                    OR useridto = ?";

        $messageexists = $DB->record_exists_sql($sql, [$userid, $userid]);

        $sql = "SELECT id

                  FROM {message_read} m

                 WHERE useridfrom = ?

                    OR useridto = ?";

        $messagereadexists = $DB->record_exists_sql($sql, [$userid, $userid]);

        return $messageexists || $messagereadexists;

    }

    /**

     * Returns conversation member info for the supplied users, relative to the supplied referenceuserid.

     *

     * This is the basic structure used when returning members, and includes information about the relationship between each member

     * and the referenceuser, such as a whether the referenceuser has marked the member as a contact, or has blocked them.

     *

     * @param int $referenceuserid the id of the user which check contact and blocked status.

     * @param array $userids

     * @param bool $includecontactrequests Do we want to include contact requests with this data?

     * @param bool $includeprivacyinfo Do we want to include whether the user can message another, and if the user

     *             requires a contact.

     * @return array the array of objects containing member info, indexed by userid.

     * @throws \coding_exception

     * @throws \dml_exception

     */

    public static function get_member_info(int $referenceuserid, array $userids, bool $includecontactrequests = false,

                                           bool $includeprivacyinfo = false): array {

        global $DB, $PAGE;

        // Prevent exception being thrown when array is empty.

        if (empty($userids)) {

            return [];

        }

        list($useridsql, $usersparams) = $DB->get_in_or_equal($userids);

        $userfieldsapi = \core_user\fields::for_userpic()->including('lastaccess');

        $userfields = $userfieldsapi->get_sql('u', false, '', '', false)->selects;

        $userssql = "SELECT $userfields, u.deleted, mc.id AS contactid, mub.id AS blockedid

                       FROM {user} u

                  LEFT JOIN {message_contacts} mc

                         ON ((mc.userid = ? AND mc.contactid = u.id) OR (mc.userid = u.id AND mc.contactid = ?))

                  LEFT JOIN {message_users_blocked} mub

                         ON (mub.userid = ? AND mub.blockeduserid = u.id)

                      WHERE u.id $useridsql";

        $usersparams = array_merge([$referenceuserid, $referenceuserid, $referenceuserid], $usersparams);

        $otherusers = $DB->get_records_sql($userssql, $usersparams);

        $members = [];

        foreach ($otherusers as $member) {

            // Set basic data.

            $data = new \stdClass();

            $data->id = $member->id;

            $data->fullname = fullname($member);

            // Create the URL for their profile.

            $profileurl = new \moodle_url('/user/profile.php', ['id' => $member->id]);

            $data->profileurl = $profileurl->out(false);

            // Set the user picture data.

            $userpicture = new \user_picture($member);

            $userpicture->size = 1; // Size f1.

            $data->profileimageurl = $userpicture->get_url($PAGE)->out(false);

            $userpicture->size = 0; // Size f2.

            $data->profileimageurlsmall = $userpicture->get_url($PAGE)->out(false);

            // Set online status indicators.

            $data->isonline = false;

            $data->showonlinestatus = false;

            if (!$member->deleted) {

                $data->isonline = self::show_online_status($member) ? self::is_online($member->lastaccess) : null;

                $data->showonlinestatus = is_null($data->isonline) ? false : true;

            }

            // Set contact and blocked status indicators.

            $data->iscontact = ($member->contactid) ? true : false;

            // We don't want that a user has been blocked if they can message the user anyways.

            $canmessageifblocked = api::can_send_message($referenceuserid, $member->id, true);

            $data->isblocked = ($member->blockedid && !$canmessageifblocked) ? true : false;

            $data->isdeleted = ($member->deleted) ? true : false;

            $data->requirescontact = null;

            $data->canmessage = null;

            $data->canmessageevenifblocked = null;

            if ($includeprivacyinfo) {

                $privacysetting = api::get_user_privacy_messaging_preference($member->id);

                $data->requirescontact = $privacysetting == api::MESSAGE_PRIVACY_ONLYCONTACTS;

                // Here we check that if the sender wanted to block the recipient, the

                // recipient would still be able to message them regardless.

                $data->canmessageevenifblocked = !$data->isdeleted && $canmessageifblocked;

                $data->canmessage = !$data->isdeleted && api::can_send_message($member->id, $referenceuserid);

            }

            // Populate the contact requests, even if we don't need them.

            $data->contactrequests = [];

            $members[$data->id] = $data;

        }

        // Check if we want to include contact requests as well.

        if (!empty($members) && $includecontactrequests) {

            list($useridsql, $usersparams) = $DB->get_in_or_equal($userids);

            $wheresql = "(userid $useridsql AND requesteduserid = ?) OR (userid = ? AND requesteduserid $useridsql)";

            $params = array_merge($usersparams, [$referenceuserid, $referenceuserid], $usersparams);

            if ($contactrequests = $DB->get_records_select('message_contact_requests', $wheresql, $params,

                    'timecreated ASC, id ASC')) {

                foreach ($contactrequests as $contactrequest) {

                    if (isset($members[$contactrequest->userid])) {

                        $members[$contactrequest->userid]->contactrequests[] = $contactrequest;

                    }

                    if (isset($members[$contactrequest->requesteduserid])) {

                        $members[$contactrequest->requesteduserid]->contactrequests[] = $contactrequest;

                    }

                }

            }

        }

        // Remove any userids not in $members. This can happen in the case of a user who has been deleted

        // from the Moodle database table (which can happen in earlier versions of Moodle).

        $userids = array_filter($userids, function($userid) use ($members) {

            return isset($members[$userid]);

        });

        // Return member information in the same order as the userids originally provided.

        $members = array_replace(array_flip($userids), $members);

        return $members;

    }

    /**

     * @deprecated since 3.6

     */

    public static function get_conversations_legacy_formatter() {

        throw new \coding_exception('\core_message\helper::get_conversations_legacy_formatter has been removed.');

    }

    /**

     * Renders the messaging widget.

     *

     * @param bool $isdrawer Are we are rendering the drawer or is this on a full page?

     * @param int|null $sendtouser The ID of the user we want to send a message to

     * @param int|null $conversationid The ID of the conversation we want to load

     * @param string|null $view The first view to load in the message widget

     * @return string The HTML.

     */

    public static function render_messaging_widget(

        bool $isdrawer,

        int $sendtouser = null,

        int $conversationid = null,

        string $view = null

    ) {

        global $USER, $CFG, $PAGE;

        // Early bail out conditions.

        if (empty($CFG->messaging) || !isloggedin() || isguestuser() || \core_user::awaiting_action()) {

            return '';

        }

        $renderer = $PAGE->get_renderer('core');

        $requestcount = \core_message\api::get_received_contact_requests_count($USER->id);

        $contactscount = \core_message\api::count_contacts($USER->id);

        $choices = [];

        $choices[] = [

            'value' => \core_message\api::MESSAGE_PRIVACY_ONLYCONTACTS,

            'text' => get_string('contactableprivacy_onlycontacts', 'message')

        ];

        $choices[] = [

            'value' => \core_message\api::MESSAGE_PRIVACY_COURSEMEMBER,

            'text' => get_string('contactableprivacy_coursemember', 'message')

        ];

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

            // Add the MESSAGE_PRIVACY_SITE option when site-wide messaging between users is enabled.

            $choices[] = [

                'value' => \core_message\api::MESSAGE_PRIVACY_SITE,

                'text' => get_string('contactableprivacy_site', 'message')

            ];

        }

        // Enter to send.

        $entertosend = get_user_preferences('message_entertosend', $CFG->messagingdefaultpressenter, $USER);

        $notification = '';

        if (!get_user_preferences('core_message_migrate_data', false)) {

            $notification = get_string('messagingdatahasnotbeenmigrated', 'message');

        }

        if ($isdrawer) {

            $template = 'core_message/message_drawer';

            $messageurl = new \moodle_url('/message/index.php');

        } else {

            $template = 'core_message/message_index';

            $messageurl = null;

        }

        $templatecontext = [

            'contactrequestcount' => $requestcount,

            'loggedinuser' => [

                'id' => $USER->id,

                'midnight' => usergetmidnight(time())

            ],

            // The starting timeout value for message polling.

            'messagepollmin' => $CFG->messagingminpoll ?? MESSAGE_DEFAULT_MIN_POLL_IN_SECONDS,

            // The maximum value that message polling timeout can reach.

            'messagepollmax' => $CFG->messagingmaxpoll ?? MESSAGE_DEFAULT_MAX_POLL_IN_SECONDS,

            // The timeout to reset back to after the max polling time has been reached.

            'messagepollaftermax' => $CFG->messagingtimeoutpoll ?? MESSAGE_DEFAULT_TIMEOUT_POLL_IN_SECONDS,

            'contacts' => [

                'sectioncontacts' => [

                    'placeholders' => array_fill(0, $contactscount > 50 ? 50 : $contactscount, true)

                ],

                'sectionrequests' => [

                    'placeholders' => array_fill(0, $requestcount > 50 ? 50 : $requestcount, true)

                ],

            ],

            'settings' => [

                'privacy' => $choices,

                'entertosend' => $entertosend

            ],

            'overview' => [

                'messageurl' => $messageurl,

                'notification' => $notification

            ],

            'isdrawer' => $isdrawer,

            'showemojipicker' => !empty($CFG->allowemojipicker),

            'messagemaxlength' => api::MESSAGE_MAX_LENGTH,

            'caneditownmessageprofile' => has_capability('moodle/user:editownmessageprofile', \context_system::instance())

        ];

        if ($sendtouser || $conversationid) {

            $route = [

                'path' => 'view-conversation',

                'params' => $conversationid ? [$conversationid] : [null, 'create', $sendtouser]

            ];

        } else if ($view === 'contactrequests') {

            $route = [

                'path' => 'view-contacts',

                'params' => ['requests']

            ];

        } else {

            $route = null;

        }

        $templatecontext['route'] = json_encode($route);

        return $renderer->render_from_template($template, $templatecontext);

    }

    /**

     * Returns user details for a user, if they are visible to the current user in the message search.

     *

     * This method checks the visibility of a user specifically for the purpose of inclusion in the message search results.

     * Visibility depends on the site-wide messaging setting 'messagingallusers':

     * If enabled, visibility depends only on the core notion of visibility; a visible site or course profile.

     * If disabled, visibility requires that the user be sharing a course with the searching user, and have a visible profile there.

     * The current user is always returned.

     *

     * You can use the $userfields parameter to reduce the amount of a user record that is required by the method.

     * The minimum user fields are:

     *  * id

     *  * deleted

     *  * all potential fullname fields

     *

     * @param \stdClass $user

     * @param array $userfields An array of userfields to be returned, the values must be a

     *                          subset of user_get_default_fields (optional)

     * @return array the array of userdetails, if visible, or an empty array otherwise.

     */

    public static function search_get_user_details(\stdClass $user, array $userfields = []): array {

        global $CFG, $USER;

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

        if ($CFG->messagingallusers || $user->id == $USER->id) {

            return \user_get_user_details_courses($user, $userfields) ?? []; // This checks visibility of site and course profiles.

        } else {

            // Messaging specific: user must share a course with the searching user AND have a visible profile there.

            $sharedcourses = enrol_get_shared_courses($USER, $user);

            foreach ($sharedcourses as $course) {

                if (user_can_view_profile($user, $course)) {

                    $userdetails = user_get_user_details($user, $course, $userfields);

                    if (!is_null($userdetails)) {

                        return $userdetails;

                    }

                }

            }

        }

        return [];

    }

    /**

     * Prevent unclosed HTML elements in a message.

     *

     * @param string $message The html message.

     * @param bool $removebody True if we want to remove tag body.

     * @return string The html properly structured.

     */

    public static function prevent_unclosed_html_tags(

        string $message,

        bool $removebody = false

    ): string {

        $html = '';

        if (!empty($message)) {

            $doc = new DOMDocument();

            $olderror = libxml_use_internal_errors(true);

            $doc->loadHTML('<?xml version="1.0" encoding="UTF-8" ?>' . $message);

            libxml_clear_errors();

            libxml_use_internal_errors($olderror);

            $html = $doc->getElementsByTagName('body')->item(0)->C14N(false, true);

            if ($removebody) {

                // Remove <body> element added in C14N function.

                $html = preg_replace('~<(/?(?:body))[^>]*>\s*~i', '', $html);

            }

        }

        return $html;

    }

}