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Developer Documentation
- Bug fixes for general core bugs in 4.2.x will end 22 April 2024 (12 months).
- Bug fixes for security issues in 4.2.x will end 7 October 2024 (18 months).
- PHP version: minimum PHP 8.0.0 Note: minimum PHP version has increased since Moodle 4.1. PHP 8.1.x is supported too.
/mod/chat/ -> lib.php (source)
<?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/>.
/**
* Library of functions and constants for module chat
*
* @package mod_chat
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once($CFG->dirroot.'/calendar/lib.php');
// Event types.
define('CHAT_EVENT_TYPE_CHATTIME', 'chattime');
// Gap between sessions. 5 minutes or more of idleness between messages in a chat means the messages belong in different sessions.
define('CHAT_SESSION_GAP', 300);
// Don't publish next chat time
define('CHAT_SCHEDULE_NONE', 0);
// Publish the specified time only.
define('CHAT_SCHEDULE_SINGLE', 1);
// Repeat chat session at the same time daily.
define('CHAT_SCHEDULE_DAILY', 2);
// Repeat chat session at the same time weekly.
define('CHAT_SCHEDULE_WEEKLY', 3);
// The HTML head for the message window to start with (<!-- nix --> is used to get some browsers starting with output.
global $CHAT_HTMLHEAD;
$CHAT_HTMLHEAD = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\"><html><head></head>\n<body>\n\n".padding(200);
// The HTML head for the message window to start with (with js scrolling).
global $CHAT_HTMLHEAD_JS;
$CHAT_HTMLHEAD_JS = <<<EOD
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><head><script type="text/javascript">
//<![CDATA[
function move() {
if (scroll_active)
window.scroll(1,400000);
window.setTimeout("move()",100);
}
var scroll_active = true;
move();
//]]>
</script>
</head>
<body onBlur="scroll_active = true" onFocus="scroll_active = false">
EOD;
global $CHAT_HTMLHEAD_JS;
$CHAT_HTMLHEAD_JS .= padding(200);
// The HTML code for standard empty pages (e.g. if a user was kicked out).
global $CHAT_HTMLHEAD_OUT;
$CHAT_HTMLHEAD_OUT = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\"><html><head><title>You are out!</title></head><body></body></html>";
// The HTML head for the message input page.
global $CHAT_HTMLHEAD_MSGINPUT;
$CHAT_HTMLHEAD_MSGINPUT = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\"><html><head><title>Message Input</title></head><body>";
// The HTML code for the message input page, with JavaScript.
global $CHAT_HTMLHEAD_MSGINPUT_JS;
$CHAT_HTMLHEAD_MSGINPUT_JS = <<<EOD
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html>
<head><title>Message Input</title>
<script type="text/javascript">
//<![CDATA[
scroll_active = true;
function empty_field_and_submit() {
document.fdummy.arsc_message.value=document.f.arsc_message.value;
document.fdummy.submit();
document.f.arsc_message.focus();
document.f.arsc_message.select();
return false;
}
//]]>
</script>
</head><body OnLoad="document.f.arsc_message.focus();document.f.arsc_message.select();">;
EOD;
// Dummy data that gets output to the browser as needed, in order to make it show output.
global $CHAT_DUMMY_DATA;
$CHAT_DUMMY_DATA = padding(200);
/**
* @param int $n
* @return string
*/
function padding($n) {
$str = '';
for ($i = 0; $i < $n; $i++) {
$str .= "<!-- nix -->\n";
}
return $str;
}
/**
* Given an object containing all the necessary data,
* (defined by the form in mod_form.php) this function
* will create a new instance and return the id number
* of the new instance.
*
* @global object
* @param object $chat
* @return int
*/
function chat_add_instance($chat) {
global $DB, $CFG;
require_once($CFG->dirroot . '/course/lib.php');
$chat->timemodified = time();
$chat->chattime = chat_calculate_next_chat_time($chat->schedule, $chat->chattime);
$returnid = $DB->insert_record("chat", $chat);
if ($chat->schedule > 0) {
$event = new stdClass();
$event->type = CALENDAR_EVENT_TYPE_ACTION;
$event->name = $chat->name;
$event->description = format_module_intro('chat', $chat, $chat->coursemodule, false);
$event->format = FORMAT_HTML;
$event->courseid = $chat->course;
$event->groupid = 0;
$event->userid = 0;
$event->modulename = 'chat';
$event->instance = $returnid;
$event->eventtype = CHAT_EVENT_TYPE_CHATTIME;
$event->timestart = $chat->chattime;
$event->timesort = $chat->chattime;
$event->timeduration = 0;
calendar_event::create($event, false);
}
if (!empty($chat->completionexpected)) {
\core_completion\api::update_completion_date_event($chat->coursemodule, 'chat', $returnid, $chat->completionexpected);
}
return $returnid;
}
/**
* Given an object containing all the necessary data,
* (defined by the form in mod_form.php) this function
* will update an existing instance with new data.
*
* @global object
* @param object $chat
* @return bool
*/
function chat_update_instance($chat) {
global $DB;
$chat->timemodified = time();
$chat->id = $chat->instance;
$chat->chattime = chat_calculate_next_chat_time($chat->schedule, $chat->chattime);
$DB->update_record("chat", $chat);
$event = new stdClass();
if ($event->id = $DB->get_field('event', 'id', array('modulename' => 'chat',
'instance' => $chat->id, 'eventtype' => CHAT_EVENT_TYPE_CHATTIME))) {
if ($chat->schedule > 0) {
$event->type = CALENDAR_EVENT_TYPE_ACTION;
$event->name = $chat->name;
$event->description = format_module_intro('chat', $chat, $chat->coursemodule, false);
$event->format = FORMAT_HTML;
$event->timestart = $chat->chattime;
$event->timesort = $chat->chattime;
$calendarevent = calendar_event::load($event->id);
$calendarevent->update($event, false);
} else {
// Do not publish this event, so delete it.
$calendarevent = calendar_event::load($event->id);
$calendarevent->delete();
}
} else {
// No event, do we need to create one?
if ($chat->schedule > 0) {
$event = new stdClass();
$event->type = CALENDAR_EVENT_TYPE_ACTION;
$event->name = $chat->name;
$event->description = format_module_intro('chat', $chat, $chat->coursemodule, false);
$event->format = FORMAT_HTML;
$event->courseid = $chat->course;
$event->groupid = 0;
$event->userid = 0;
$event->modulename = 'chat';
$event->instance = $chat->id;
$event->eventtype = CHAT_EVENT_TYPE_CHATTIME;
$event->timestart = $chat->chattime;
$event->timesort = $chat->chattime;
$event->timeduration = 0;
calendar_event::create($event, false);
}
}
$completionexpected = (!empty($chat->completionexpected)) ? $chat->completionexpected : null;
\core_completion\api::update_completion_date_event($chat->coursemodule, 'chat', $chat->id, $completionexpected);
return true;
}
/**
* Given an ID of an instance of this module,
* this function will permanently delete the instance
* and any data that depends on it.
*
* @global object
* @param int $id
* @return bool
*/
function chat_delete_instance($id) {
global $DB;
if (! $chat = $DB->get_record('chat', array('id' => $id))) {
return false;
}
$result = true;
// Delete any dependent records here.
if (! $DB->delete_records('chat', array('id' => $chat->id))) {
$result = false;
}
if (! $DB->delete_records('chat_messages', array('chatid' => $chat->id))) {
$result = false;
}
if (! $DB->delete_records('chat_messages_current', array('chatid' => $chat->id))) {
$result = false;
}
if (! $DB->delete_records('chat_users', array('chatid' => $chat->id))) {
$result = false;
}
if (! $DB->delete_records('event', array('modulename' => 'chat', 'instance' => $chat->id))) {
$result = false;
}
return $result;
}
/**
* Given a course and a date, prints a summary of all chat rooms past and present
* This function is called from block_recent_activity
*
* @global object
* @global object
* @global object
* @param object $course
* @param bool $viewfullnames
* @param int|string $timestart Timestamp
* @return bool
*/
function chat_print_recent_activity($course, $viewfullnames, $timestart) {
global $CFG, $USER, $DB, $OUTPUT;
// This is approximate only, but it is really fast.
$timeout = $CFG->chat_old_ping * 10;
if (!$mcms = $DB->get_records_sql("SELECT cm.id, MAX(chm.timestamp) AS lasttime
FROM {course_modules} cm
JOIN {modules} md ON md.id = cm.module
JOIN {chat} ch ON ch.id = cm.instance
JOIN {chat_messages} chm ON chm.chatid = ch.id
WHERE chm.timestamp > ? AND ch.course = ? AND md.name = 'chat'
GROUP BY cm.id
ORDER BY lasttime ASC", array($timestart, $course->id))) {
return false;
}
$past = array();
$current = array();
$modinfo = get_fast_modinfo($course); // Reference needed because we might load the groups.
foreach ($mcms as $cmid => $mcm) {
if (!array_key_exists($cmid, $modinfo->cms)) {
continue;
}
$cm = $modinfo->cms[$cmid];
if (!$modinfo->cms[$cm->id]->uservisible) {
continue;
}
if (groups_get_activity_groupmode($cm) != SEPARATEGROUPS
or has_capability('moodle/site:accessallgroups', context_module::instance($cm->id))) {
if ($timeout > time() - $mcm->lasttime) {
$current[] = $cm;
} else {
$past[] = $cm;
}
continue;
}
// Verify groups in separate mode.
if (!$mygroupids = $modinfo->get_groups($cm->groupingid)) {
continue;
}
// Ok, last post was not for my group - we have to query db to get last message from one of my groups.
// The only minor problem is that the order will not be correct.
$mygroupids = implode(',', $mygroupids);
if (!$mcm = $DB->get_record_sql("SELECT cm.id, MAX(chm.timestamp) AS lasttime
FROM {course_modules} cm
JOIN {chat} ch ON ch.id = cm.instance
JOIN {chat_messages_current} chm ON chm.chatid = ch.id
WHERE chm.timestamp > ? AND cm.id = ? AND
(chm.groupid IN ($mygroupids) OR chm.groupid = 0)
GROUP BY cm.id", array($timestart, $cm->id))) {
continue;
}
$mcms[$cmid]->lasttime = $mcm->lasttime;
if ($timeout > time() - $mcm->lasttime) {
$current[] = $cm;
} else {
$past[] = $cm;
}
}
if (!$past and !$current) {
return false;
}
$strftimerecent = get_string('strftimerecent');
if ($past) {
echo $OUTPUT->heading(get_string("pastchats", 'chat') . ':', 6);
foreach ($past as $cm) {
$link = $CFG->wwwroot.'/mod/chat/view.php?id='.$cm->id;
$date = userdate($mcms[$cm->id]->lasttime, $strftimerecent);
echo '<div class="head"><div class="date">'.$date.'</div></div>';
echo '<div class="info"><a href="'.$link.'">'.format_string($cm->name, true).'</a></div>';
}
}
if ($current) {
echo $OUTPUT->heading(get_string("currentchats", 'chat') . ':', 6);
$oldest = floor((time() - $CFG->chat_old_ping) / 10) * 10; // Better db caching.
$timeold = time() - $CFG->chat_old_ping;
$timeold = floor($timeold / 10) * 10; // Better db caching.
$timeoldext = time() - ($CFG->chat_old_ping * 10); // JSless gui_basic needs much longer timeouts.
$timeoldext = floor($timeoldext / 10) * 10; // Better db caching.
$params = array('timeold' => $timeold, 'timeoldext' => $timeoldext, 'cmid' => $cm->id);
$timeout = "AND ((chu.version<>'basic' AND chu.lastping>:timeold) OR (chu.version='basic' AND chu.lastping>:timeoldext))";
foreach ($current as $cm) {
// Count users first.
$mygroupids = $modinfo->groups[$cm->groupingid];
if (!empty($mygroupids)) {
list($subquery, $subparams) = $DB->get_in_or_equal($mygroupids, SQL_PARAMS_NAMED, 'gid');
$params += $subparams;
$groupselect = "AND (chu.groupid $subquery OR chu.groupid = 0)";
} else {
$groupselect = "";
}
$userfieldsapi = \core_user\fields::for_userpic();
$userfields = $userfieldsapi->get_sql('u', false, '', '', false)->selects;
if (!$users = $DB->get_records_sql("SELECT $userfields
FROM {course_modules} cm
JOIN {chat} ch ON ch.id = cm.instance
JOIN {chat_users} chu ON chu.chatid = ch.id
JOIN {user} u ON u.id = chu.userid
WHERE cm.id = :cmid $timeout $groupselect
GROUP BY $userfields", $params)) {
}
$link = $CFG->wwwroot.'/mod/chat/view.php?id='.$cm->id;
$date = userdate($mcms[$cm->id]->lasttime, $strftimerecent);
echo '<div class="head"><div class="date">'.$date.'</div></div>';
echo '<div class="info"><a href="'.$link.'">'.format_string($cm->name, true).'</a></div>';
echo '<div class="userlist">';
if ($users) {
echo '<ul>';
foreach ($users as $user) {
echo '<li>'.fullname($user, $viewfullnames).'</li>';
}
echo '</ul>';
}
echo '</div>';
}
}
return true;
}
/**
* This standard function will check all instances of this module
* and make sure there are up-to-date events created for each of them.
* If courseid = 0, then every chat event in the site is checked, else
* only chat events belonging to the course specified are checked.
* This function is used, in its new format, by restore_refresh_events()
*
* @global object
* @param int $courseid
* @param int|stdClass $instance Chat module instance or ID.
* @param int|stdClass $cm Course module object or ID.
* @return bool
*/
function chat_refresh_events($courseid = 0, $instance = null, $cm = null) {
global $DB;
// If we have instance information then we can just update the one event instead of updating all events.
if (isset($instance)) {
if (!is_object($instance)) {
$instance = $DB->get_record('chat', array('id' => $instance), '*', MUST_EXIST);
}
if (isset($cm)) {
if (!is_object($cm)) {
chat_prepare_update_events($instance);
return true;
} else {
chat_prepare_update_events($instance, $cm);
return true;
}
}
}
if ($courseid) {
if (! $chats = $DB->get_records("chat", array("course" => $courseid))) {
return true;
}
} else {
if (! $chats = $DB->get_records("chat")) {
return true;
}
}
foreach ($chats as $chat) {
chat_prepare_update_events($chat);
}
return true;
}
/**
* Updates both the normal and completion calendar events for chat.
*
* @param stdClass $chat The chat object (from the DB)
* @param stdClass $cm The course module object.
*/
function chat_prepare_update_events($chat, $cm = null) {
global $DB;
if (!isset($cm)) {
$cm = get_coursemodule_from_instance('chat', $chat->id, $chat->course);
}
$event = new stdClass();
$event->name = $chat->name;
$event->type = CALENDAR_EVENT_TYPE_ACTION;
$event->description = format_module_intro('chat', $chat, $cm->id, false);
$event->format = FORMAT_HTML;
$event->timestart = $chat->chattime;
$event->timesort = $chat->chattime;
if ($event->id = $DB->get_field('event', 'id', array('modulename' => 'chat', 'instance' => $chat->id,
'eventtype' => CHAT_EVENT_TYPE_CHATTIME))) {
$calendarevent = calendar_event::load($event->id);
$calendarevent->update($event, false);
} else if ($chat->schedule > 0) {
// The chat is scheduled and the event should be published.
$event->courseid = $chat->course;
$event->groupid = 0;
$event->userid = 0;
$event->modulename = 'chat';
$event->instance = $chat->id;
$event->eventtype = CHAT_EVENT_TYPE_CHATTIME;
$event->timeduration = 0;
$event->visible = $cm->visible;
calendar_event::create($event, false);
}
}
// Functions that require some SQL.
/**
* @global object
* @param int $chatid
* @param int $groupid
* @param int $groupingid
* @return array
*/
function chat_get_users($chatid, $groupid=0, $groupingid=0) {
global $DB;
$params = array('chatid' => $chatid, 'groupid' => $groupid, 'groupingid' => $groupingid);
if ($groupid) {
$groupselect = " AND (c.groupid=:groupid OR c.groupid='0')";
} else {
$groupselect = "";
}
if (!empty($groupingid)) {
$groupingjoin = "JOIN {groups_members} gm ON u.id = gm.userid
JOIN {groupings_groups} gg ON gm.groupid = gg.groupid AND gg.groupingid = :groupingid ";
} else {
$groupingjoin = '';
}
$userfieldsapi = \core_user\fields::for_userpic();
$ufields = $userfieldsapi->get_sql('u', false, '', '', false)->selects;
return $DB->get_records_sql("SELECT DISTINCT $ufields, c.lastmessageping, c.firstping
FROM {chat_users} c
JOIN {user} u ON u.id = c.userid $groupingjoin
WHERE c.chatid = :chatid $groupselect
ORDER BY c.firstping ASC", $params);
}
/**
* @global object
* @param int $chatid
* @param int $groupid
* @return array
*/
function chat_get_latest_message($chatid, $groupid=0) {
global $DB;
$params = array('chatid' => $chatid, 'groupid' => $groupid);
if ($groupid) {
$groupselect = "AND (groupid=:groupid OR groupid=0)";
} else {
$groupselect = "";
}
$sql = "SELECT *
FROM {chat_messages_current} WHERE chatid = :chatid $groupselect
ORDER BY timestamp DESC, id DESC";
// Return the lastest one message.
return $DB->get_record_sql($sql, $params, true);
}
/**
* login if not already logged in
*
* @global object
* @global object
* @param int $chatid
* @param string $version
* @param int $groupid
* @param object $course
* @return bool|int Returns the chat users sid or false
*/
function chat_login_user($chatid, $version, $groupid, $course) {
global $USER, $DB;
if (($version != 'sockets') and $chatuser = $DB->get_record('chat_users', array('chatid' => $chatid,
'userid' => $USER->id,
'groupid' => $groupid))) {
// This will update logged user information.
$chatuser->version = $version;
$chatuser->ip = $USER->lastip;
$chatuser->lastping = time();
$chatuser->lang = current_language();
// Sometimes $USER->lastip is not setup properly during login.
// Update with current value if possible or provide a dummy value for the db.
if (empty($chatuser->ip)) {
$chatuser->ip = getremoteaddr();
}
if (($chatuser->course != $course->id) or ($chatuser->userid != $USER->id)) {
return false;
}
$DB->update_record('chat_users', $chatuser);
} else {
$chatuser = new stdClass();
$chatuser->chatid = $chatid;
$chatuser->userid = $USER->id;
$chatuser->groupid = $groupid;
$chatuser->version = $version;
$chatuser->ip = $USER->lastip;
$chatuser->lastping = $chatuser->firstping = $chatuser->lastmessageping = time();
$chatuser->sid = random_string(32);
$chatuser->course = $course->id; // Caching - needed for current_language too.
$chatuser->lang = current_language(); // Caching - to resource intensive to find out later.
// Sometimes $USER->lastip is not setup properly during login.
// Update with current value if possible or provide a dummy value for the db.
if (empty($chatuser->ip)) {
$chatuser->ip = getremoteaddr();
}
$DB->insert_record('chat_users', $chatuser);
if ($version == 'sockets') {
// Do not send 'enter' message, chatd will do it.
} else {
chat_send_chatmessage($chatuser, 'enter', true);
}
}
return $chatuser->sid;
}
/**
* Delete the old and in the way
*
* @global object
* @global object
*/
function chat_delete_old_users() {
// Delete the old and in the way.
global $CFG, $DB;
$timeold = time() - $CFG->chat_old_ping;
$timeoldext = time() - ($CFG->chat_old_ping * 10); // JSless gui_basic needs much longer timeouts.
$query = "(version<>'basic' AND lastping<?) OR (version='basic' AND lastping<?)";
$params = array($timeold, $timeoldext);
if ($oldusers = $DB->get_records_select('chat_users', $query, $params) ) {
$DB->delete_records_select('chat_users', $query, $params);
foreach ($oldusers as $olduser) {
chat_send_chatmessage($olduser, 'exit', true);
}
}
}
/**
* Calculate next chat session time based on schedule.
*
* @param int $schedule
* @param int $chattime
*
* @return int timestamp
*/
function chat_calculate_next_chat_time(int $schedule, int $chattime): int {
$timenow = time();
switch ($schedule) {
case CHAT_SCHEDULE_DAILY: { // Repeat daily.
while ($chattime <= $timenow) {
$chattime += DAYSECS;
}
break;
}
case CHAT_SCHEDULE_WEEKLY: { // Repeat weekly.
while ($chattime <= $timenow) {
$chattime += WEEKSECS;
}
break;
}
}
return $chattime;
}
/**
* Updates chat records so that the next chat time is correct
*
* @global object
* @param int $chatid
* @return void
*/
function chat_update_chat_times($chatid=0) {
// Updates chat records so that the next chat time is correct.
global $DB;
$timenow = time();
$params = array('timenow' => $timenow, 'chatid' => $chatid);
if ($chatid) {
if (!$chats[] = $DB->get_record_select("chat", "id = :chatid AND chattime <= :timenow AND schedule > 0", $params)) {
return;
}
} else {
if (!$chats = $DB->get_records_select("chat", "chattime <= :timenow AND schedule > 0", $params)) {
return;
}
}
$courseids = [];
foreach ($chats as $chat) {
$originalchattime = $chat->chattime;
$chat->chattime = chat_calculate_next_chat_time($chat->schedule, $chat->chattime);
if ($originalchattime != $chat->chattime) {
$courseids[] = $chat->course;
$DB->update_record("chat", $chat);
$cm = get_coursemodule_from_instance('chat', $chat->id, $chat->course);
\course_modinfo::purge_course_module_cache($cm->course, $cm->id);
}
$event = new stdClass(); // Update calendar too.
$cond = "modulename='chat' AND eventtype = :eventtype AND instance = :chatid AND timestart <> :chattime";
$params = ['chattime' => $chat->chattime, 'eventtype' => CHAT_EVENT_TYPE_CHATTIME, 'chatid' => $chat->id];
if ($event->id = $DB->get_field_select('event', 'id', $cond, $params)) {
$event->timestart = $chat->chattime;
$event->timesort = $chat->chattime;
$calendarevent = calendar_event::load($event->id);
$calendarevent->update($event, false);
}
}
$courseids = array_unique($courseids);
foreach ($courseids as $courseid) {
rebuild_course_cache($courseid, true, true);
}
}
/**
* Send a message on the chat.
*
* @param object $chatuser The chat user record.
* @param string $messagetext The message to be sent.
* @param bool $issystem False for non-system messages, true for system messages.
* @param object $cm The course module object, pass it to save a database query when we trigger the event.
* @return int The message ID.
* @since Moodle 2.6
*/
function chat_send_chatmessage($chatuser, $messagetext, $issystem = false, $cm = null) {
global $DB;
$message = new stdClass();
$message->chatid = $chatuser->chatid;
$message->userid = $chatuser->userid;
$message->groupid = $chatuser->groupid;
$message->message = $messagetext;
$message->issystem = $issystem ? 1 : 0;
$message->timestamp = time();
$messageid = $DB->insert_record('chat_messages', $message);
$DB->insert_record('chat_messages_current', $message);
$message->id = $messageid;
if (!$issystem) {
if (empty($cm)) {
$cm = get_coursemodule_from_instance('chat', $chatuser->chatid, $chatuser->course);
}
$params = array(
'context' => context_module::instance($cm->id),
'objectid' => $message->id,
// We set relateduserid, because when triggered from the chat daemon, the event userid is null.
'relateduserid' => $chatuser->userid
);
$event = \mod_chat\event\message_sent::create($params);
$event->add_record_snapshot('chat_messages', $message);
$event->trigger();
}
return $message->id;
}
/**
* @global object
* @global object
* @param object $message
* @param int $courseid
* @param object $sender
* @param object $currentuser
* @param string $chatlastrow
* @return bool|string Returns HTML or false
*/
function chat_format_message_manually($message, $courseid, $sender, $currentuser, $chatlastrow = null) {
global $CFG, $USER, $OUTPUT;
$output = new stdClass();
$output->beep = false; // By default.
$output->refreshusers = false; // By default.
// Find the correct timezone for displaying this message.
$tz = core_date::get_user_timezone($currentuser);
$message->strtime = userdate($message->timestamp, get_string('strftimemessage', 'chat'), $tz);
$message->picture = $OUTPUT->user_picture($sender, array('size' => false, 'courseid' => $courseid, 'link' => false));
if ($courseid) {
$message->picture = "<a onclick=\"window.open('$CFG->wwwroot/user/view.php?id=$sender->id&course=$courseid')\"".
" href=\"$CFG->wwwroot/user/view.php?id=$sender->id&course=$courseid\">$message->picture</a>";
}
// Calculate the row class.
if ($chatlastrow !== null) {
$rowclass = ' class="r'.$chatlastrow.'" ';
} else {
$rowclass = '';
}
// Start processing the message.
if (!empty($message->issystem)) {
// System event.
$output->text = $message->strtime.': '.get_string('message'.$message->message, 'chat', fullname($sender));
$output->html = '<table class="chat-event"><tr'.$rowclass.'><td class="picture">'.$message->picture.'</td>';
$output->html .= '<td class="text"><span class="event">'.$output->text.'</span></td></tr></table>';
$output->basic = '<tr class="r1">
<th scope="row" class="cell c1 title"></th>
<td class="cell c2 text">' . get_string('message'.$message->message, 'chat', fullname($sender)) . '</td>
<td class="cell c3">' . $message->strtime . '</td>
</tr>';
if ($message->message == 'exit' or $message->message == 'enter') {
$output->refreshusers = true; // Force user panel refresh ASAP.
}
return $output;
}
// It's not a system event.
$rawtext = trim($message->message);
// Options for format_text, when we get to it...
// format_text call will parse the text to clean and filter it.
// It cannot be called here as HTML-isation interferes with special case
// recognition, but *must* be called on any user-sourced text to be inserted
// into $outmain.
$options = new stdClass();
$options->para = false;
$options->blanktarget = true;
// And now check for special cases.
$patternto = '#^\s*To\s([^:]+):(.*)#';
$special = false;
if (substr($rawtext, 0, 5) == 'beep ') {
// It's a beep!
$special = true;
$beepwho = trim(substr($rawtext, 5));
if ($beepwho == 'all') { // Everyone.
$outinfobasic = get_string('messagebeepseveryone', 'chat', fullname($sender));
$outinfo = $message->strtime . ': ' . $outinfobasic;
$outmain = '';
$output->beep = true; // Eventually this should be set to a filename uploaded by the user.
} else if ($beepwho == $currentuser->id) { // Current user.
$outinfobasic = get_string('messagebeepsyou', 'chat', fullname($sender));
$outinfo = $message->strtime . ': ' . $outinfobasic;
$outmain = '';
$output->beep = true;
} else { // Something is not caught?
return false;
}
} else if (substr($rawtext, 0, 1) == '/') { // It's a user command.
$special = true;
$pattern = '#(^\/)(\w+).*#';
preg_match($pattern, $rawtext, $matches);
$command = isset($matches[2]) ? $matches[2] : false;
// Support some IRC commands.
switch ($command) {
case 'me':
$outinfo = $message->strtime;
$text = '*** <b>'.$sender->firstname.' '.substr($rawtext, 4).'</b>';
$outmain = format_text($text, FORMAT_MOODLE, $options, $courseid);
break;
default:
// Error, we set special back to false to use the classic message output.
$special = false;
break;
}
} else if (preg_match($patternto, $rawtext)) {
$special = true;
$matches = array();
preg_match($patternto, $rawtext, $matches);
if (isset($matches[1]) && isset($matches[2])) {
$text = format_text($matches[2], FORMAT_MOODLE, $options, $courseid);
$outinfo = $message->strtime;
$outmain = $sender->firstname.' '.get_string('saidto', 'chat').' <i>'.$matches[1].'</i>: '.$text;
} else {
// Error, we set special back to false to use the classic message output.
$special = false;
}
}
if (!$special) {
$text = format_text($rawtext, FORMAT_MOODLE, $options, $courseid);
$outinfo = $message->strtime.' '.$sender->firstname;
$outmain = $text;
}
// Format the message as a small table.
$output->text = strip_tags($outinfo.': '.$outmain);
$output->html = "<table class=\"chat-message\"><tr$rowclass><td class=\"picture\" valign=\"top\">$message->picture</td>";
$output->html .= "<td class=\"text\"><span class=\"title\">$outinfo</span>";
if ($outmain) {
$output->html .= ": $outmain";
$output->basic = '<tr class="r0">
<th scope="row" class="cell c1 title">' . $sender->firstname . '</th>
<td class="cell c2 text">' . $outmain . '</td>
<td class="cell c3">' . $message->strtime . '</td>
</tr>';
} else {
$output->basic = '<tr class="r1">
<th scope="row" class="cell c1 title"></th>
<td class="cell c2 text">' . $outinfobasic . '</td>
<td class="cell c3">' . $message->strtime . '</td>
</tr>';
}
$output->html .= "</td></tr></table>";
return $output;
}
/**
* Given a message object this function formats it appropriately into text and html then returns the formatted data
* @global object
* @param object $message
* @param int $courseid
* @param object $currentuser
* @param string $chatlastrow
* @return bool|string Returns HTML or false
*/
function chat_format_message($message, $courseid, $currentuser, $chatlastrow=null) {
global $DB;
static $users; // Cache user lookups.
if (isset($users[$message->userid])) {
$user = $users[$message->userid];
} else if ($user = $DB->get_record('user', ['id' => $message->userid], implode(',', \core_user\fields::get_picture_fields()))) {
$users[$message->userid] = $user;
} else {
return null;
}
return chat_format_message_manually($message, $courseid, $user, $currentuser, $chatlastrow);
}
/**
* @global object
* @param object $message message to be displayed.
* @param mixed $chatuser user chat data
* @param object $currentuser current user for whom the message should be displayed.
* @param int $groupingid course module grouping id
* @param string $theme name of the chat theme.
* @return bool|string Returns HTML or false
*/
function chat_format_message_theme ($message, $chatuser, $currentuser, $groupingid, $theme = 'bubble') {
global $CFG, $USER, $OUTPUT, $COURSE, $DB, $PAGE;
require_once($CFG->dirroot.'/mod/chat/locallib.php');
static $users; // Cache user lookups.
$result = new stdClass();
if (file_exists($CFG->dirroot . '/mod/chat/gui_ajax/theme/'.$theme.'/config.php')) {
include($CFG->dirroot . '/mod/chat/gui_ajax/theme/'.$theme.'/config.php');
}
if (isset($users[$message->userid])) {
$sender = $users[$message->userid];
} else if ($sender = $DB->get_record('user', array('id' => $message->userid),
implode(',', \core_user\fields::get_picture_fields()))) {
$users[$message->userid] = $sender;
} else {
return null;
}
// Find the correct timezone for displaying this message.
$tz = core_date::get_user_timezone($currentuser);
if (empty($chatuser->course)) {
$courseid = $COURSE->id;
} else {
$courseid = $chatuser->course;
}
$message->strtime = userdate($message->timestamp, get_string('strftimemessage', 'chat'), $tz);
$message->picture = $OUTPUT->user_picture($sender, array('courseid' => $courseid));
$message->picture = "<a target='_blank'".
" href=\"$CFG->wwwroot/user/view.php?id=$sender->id&course=$courseid\">$message->picture</a>";
// Start processing the message.
if (!empty($message->issystem)) {
$result->type = 'system';
$senderprofile = $CFG->wwwroot.'/user/view.php?id='.$sender->id.'&course='.$courseid;
$event = get_string('message'.$message->message, 'chat', fullname($sender));
$eventmessage = new event_message($senderprofile, fullname($sender), $message->strtime, $event, $theme);
$output = $PAGE->get_renderer('mod_chat');
$result->html = $output->render($eventmessage);
return $result;
}
// It's not a system event.
$rawtext = trim($message->message);
// Options for format_text, when we get to it...
// format_text call will parse the text to clean and filter it.
// It cannot be called here as HTML-isation interferes with special case
// recognition, but *must* be called on any user-sourced text to be inserted
// into $outmain.
$options = new stdClass();
$options->para = false;
$options->blanktarget = true;
// And now check for special cases.
$special = false;
$outtime = $message->strtime;
// Initialise variables.
$outmain = '';
$patternto = '#^\s*To\s([^:]+):(.*)#';
if (substr($rawtext, 0, 5) == 'beep ') {
$special = true;
// It's a beep!
$result->type = 'beep';
$beepwho = trim(substr($rawtext, 5));
if ($beepwho == 'all') { // Everyone.
$outmain = get_string('messagebeepseveryone', 'chat', fullname($sender));
} else if ($beepwho == $currentuser->id) { // Current user.
$outmain = get_string('messagebeepsyou', 'chat', fullname($sender));
} else if ($sender->id == $currentuser->id) { // Something is not caught?
// Allow beep for a active chat user only, else user can beep anyone and get fullname.
if (!empty($chatuser) && is_numeric($beepwho)) {
$chatusers = chat_get_users($chatuser->chatid, $chatuser->groupid, $groupingid);
if (array_key_exists($beepwho, $chatusers)) {
$outmain = get_string('messageyoubeep', 'chat', fullname($chatusers[$beepwho]));
} else {
$outmain = get_string('messageyoubeep', 'chat', $beepwho);
}
} else {
$outmain = get_string('messageyoubeep', 'chat', $beepwho);
}
}
} else if (substr($rawtext, 0, 1) == '/') { // It's a user command.
$special = true;
$result->type = 'command';
$pattern = '#(^\/)(\w+).*#';
preg_match($pattern, $rawtext, $matches);
$command = isset($matches[2]) ? $matches[2] : false;
// Support some IRC commands.
switch ($command) {
case 'me':
$text = '*** <b>'.$sender->firstname.' '.substr($rawtext, 4).'</b>';
$outmain = format_text($text, FORMAT_MOODLE, $options, $courseid);
break;
default:
// Error, we set special back to false to use the classic message output.
$special = false;
break;
}
} else if (preg_match($patternto, $rawtext)) {
$special = true;
$result->type = 'dialogue';
$matches = array();
preg_match($patternto, $rawtext, $matches);
if (isset($matches[1]) && isset($matches[2])) {
$text = format_text($matches[2], FORMAT_MOODLE, $options, $courseid);
$outmain = $sender->firstname.' <b>'.get_string('saidto', 'chat').'</b> <i>'.$matches[1].'</i>: '.$text;
} else {
// Error, we set special back to false to use the classic message output.
$special = false;
}
}
if (!$special) {
$text = format_text($rawtext, FORMAT_MOODLE, $options, $courseid);
$outmain = $text;
}
$result->text = strip_tags($outtime.': '.$outmain);
$mymessageclass = '';
if ($sender->id == $USER->id) {
$mymessageclass = 'chat-message-mymessage';
}
$senderprofile = $CFG->wwwroot.'/user/view.php?id='.$sender->id.'&course='.$courseid;
$usermessage = new user_message($senderprofile, fullname($sender), $message->picture,
$mymessageclass, $outtime, $outmain, $theme);
$output = $PAGE->get_renderer('mod_chat');
$result->html = $output->render($usermessage);
// When user beeps other user, then don't show any timestamp to other users in chat.
if (('' === $outmain) && $special) {
return false;
} else {
return $result;
}
}
/**
* @global object $DB
* @global object $CFG
* @global object $COURSE
* @global object $OUTPUT
* @param object $users
* @param object $course
* @return array return formatted user list
*/
function chat_format_userlist($users, $course) {
global $CFG, $DB, $COURSE, $OUTPUT;
$result = array();
foreach ($users as $user) {
$item = array();
$item['name'] = fullname($user);
$item['url'] = $CFG->wwwroot.'/user/view.php?id='.$user->id.'&course='.$course->id;
$item['picture'] = $OUTPUT->user_picture($user);
$item['id'] = $user->id;
$result[] = $item;
}
return $result;
}
/**
* Print json format error
* @param string $level
* @param string $msg
*/
function chat_print_error($level, $msg) {
header('Content-Length: ' . ob_get_length() );
$error = new stdClass();
$error->level = $level;
$error->msg = $msg;
$response['error'] = $error;
echo json_encode($response);
ob_end_flush();
exit;
}
/**
* List the actions that correspond to a view of this module.
* This is used by the participation report.
*
* Note: This is not used by new logging system. Event with
* crud = 'r' and edulevel = LEVEL_PARTICIPATING will
* be considered as view action.
*
* @return array
*/
function chat_get_view_actions() {
return array('view', 'view all', 'report');
}
/**
* List the actions that correspond to a post of this module.
* This is used by the participation report.
*
* Note: This is not used by new logging system. Event with
* crud = ('c' || 'u' || 'd') and edulevel = LEVEL_PARTICIPATING
* will be considered as post action.
*
* @return array
*/
function chat_get_post_actions() {
return array('talk');
}
/**
* @deprecated since Moodle 3.3, when the block_course_overview block was removed.
*/
function chat_print_overview() {
throw new coding_exception('chat_print_overview() can not be used any more and is obsolete.');
}
/**
* Implementation of the function for printing the form elements that control
* whether the course reset functionality affects the chat.
*
< * @param object $mform form passed by reference
> * @param MoodleQuickForm $mform form passed by reference
*/
function chat_reset_course_form_definition(&$mform) {
$mform->addElement('header', 'chatheader', get_string('modulenameplural', 'chat'));
$mform->addElement('advcheckbox', 'reset_chat', get_string('removemessages', 'chat'));
}
/**
* Course reset form defaults.
*
* @param object $course
* @return array
*/
function chat_reset_course_form_defaults($course) {
return array('reset_chat' => 1);
}
/**
* Actual implementation of the reset course functionality, delete all the
* chat messages for course $data->courseid.
*
* @global object
* @global object
* @param object $data the data submitted from the reset course.
* @return array status array
*/
function chat_reset_userdata($data) {
global $CFG, $DB;
$componentstr = get_string('modulenameplural', 'chat');
$status = array();
if (!empty($data->reset_chat)) {
$chatessql = "SELECT ch.id
FROM {chat} ch
WHERE ch.course=?";
$params = array($data->courseid);
$DB->delete_records_select('chat_messages', "chatid IN ($chatessql)", $params);
$DB->delete_records_select('chat_messages_current', "chatid IN ($chatessql)", $params);
$DB->delete_records_select('chat_users', "chatid IN ($chatessql)", $params);
$status[] = array('component' => $componentstr, 'item' => get_string('removemessages', 'chat'), 'error' => false);
}
// Updating dates - shift may be negative too.
if ($data->timeshift) {
// Any changes to the list of dates that needs to be rolled should be same during course restore and course reset.
// See MDL-9367.
shift_course_mod_dates('chat', array('chattime'), $data->timeshift, $data->courseid);
$status[] = array('component' => $componentstr, 'item' => get_string('datechanged'), 'error' => false);
}
return $status;
}
/**
* @param string $feature FEATURE_xx constant for requested feature
* @return mixed True if module supports feature, false if not, null if doesn't know or string for the module purpose.
*/
function chat_supports($feature) {
switch($feature) {
case FEATURE_GROUPS:
return true;
case FEATURE_GROUPINGS:
return true;
case FEATURE_MOD_INTRO:
return true;
case FEATURE_BACKUP_MOODLE2:
return true;
case FEATURE_COMPLETION_TRACKS_VIEWS:
return true;
case FEATURE_GRADE_HAS_GRADE:
return false;
case FEATURE_GRADE_OUTCOMES:
return true;
case FEATURE_SHOW_DESCRIPTION:
return true;
case FEATURE_MOD_PURPOSE:
return MOD_PURPOSE_COMMUNICATION;
default:
return null;
}
}
function chat_extend_navigation($navigation, $course, $module, $cm) {
global $CFG;
$currentgroup = groups_get_activity_group($cm, true);
if (has_capability('mod/chat:chat', context_module::instance($cm->id))) {
$strenterchat = get_string('enterchat', 'chat');
$target = $CFG->wwwroot.'/mod/chat/';
$params = array('id' => $cm->instance);
if ($currentgroup) {
$params['groupid'] = $currentgroup;
}
$links = array();
$url = new moodle_url($target.'gui_'.$CFG->chat_method.'/index.php', $params);
$action = new popup_action('click', $url, 'chat'.$course->id.$cm->instance.$currentgroup,
array('height' => 500, 'width' => 700));
$links[] = new action_link($url, $strenterchat, $action);
$url = new moodle_url($target.'gui_basic/index.php', $params);
$action = new popup_action('click', $url, 'chat'.$course->id.$cm->instance.$currentgroup,
array('height' => 500, 'width' => 700));
$links[] = new action_link($url, get_string('noframesjs', 'message'), $action);
foreach ($links as $link) {
$navigation->add($link->text, $link, navigation_node::TYPE_SETTING, null , null, new pix_icon('i/group' , ''));
}
}
$chatusers = chat_get_users($cm->instance, $currentgroup, $cm->groupingid);
if (is_array($chatusers) && count($chatusers) > 0) {
$users = $navigation->add(get_string('currentusers', 'chat'));
foreach ($chatusers as $chatuser) {
$userlink = new moodle_url('/user/view.php', array('id' => $chatuser->id, 'course' => $course->id));
$users->add(fullname($chatuser).' '.format_time(time() - $chatuser->lastmessageping),
$userlink, navigation_node::TYPE_USER, null, null, new pix_icon('i/user', ''));
}
}
}
/**
* Adds module specific settings to the settings block
*
* @param settings_navigation $settings The settings navigation object
* @param navigation_node $chatnode The node to add module settings to
*/
function chat_extend_settings_navigation(settings_navigation $settings, navigation_node $chatnode) {
global $DB;
$chat = $DB->get_record("chat", array("id" => $settings->get_page()->cm->instance));
$currentgroup = groups_get_activity_group($settings->get_page()->cm, true);
if ($currentgroup) {
$groupselect = " AND groupid = '$currentgroup'";
} else {
$groupselect = '';
}
if ($chat->studentlogs || has_capability('mod/chat:readlog', $settings->get_page()->cm->context)) {
if ($DB->get_records_select('chat_messages', "chatid = ? $groupselect", array($chat->id))) {
$chatnode->add(get_string('pastsessions', 'chat'),
new moodle_url('/mod/chat/report.php', array('id' => $settings->get_page()->cm->id)),
navigation_node::TYPE_SETTING, null, 'pastsessions');
}
}
}
/**
* user logout event handler
*
* @param \core\event\user_loggedout $event The event.
* @return void
*/
function chat_user_logout(\core\event\user_loggedout $event) {
global $DB;
$DB->delete_records('chat_users', array('userid' => $event->objectid));
}
/**
* Return a list of page types
* @param string $pagetype current page type
* @param stdClass $parentcontext Block's parent context
* @param stdClass $currentcontext Current context of block
*/
function chat_page_type_list($pagetype, $parentcontext, $currentcontext) {
$modulepagetype = array('mod-chat-*' => get_string('page-mod-chat-x', 'chat'));
return $modulepagetype;
}
/**
* Return a list of the latest messages in the given chat session.
*
* @param stdClass $chatuser chat user session data
* @param int $chatlasttime last time messages were retrieved
* @return array list of messages
* @since Moodle 3.0
*/
function chat_get_latest_messages($chatuser, $chatlasttime) {
global $DB;
$params = array('groupid' => $chatuser->groupid, 'chatid' => $chatuser->chatid, 'lasttime' => $chatlasttime);
$groupselect = $chatuser->groupid ? " AND (groupid=" . $chatuser->groupid . " OR groupid=0) " : "";
return $DB->get_records_select('chat_messages_current', 'chatid = :chatid AND timestamp > :lasttime ' . $groupselect,
$params, 'timestamp ASC');
}
/**
* Mark the activity completed (if required) and trigger the course_module_viewed event.
*
* @param stdClass $chat chat object
* @param stdClass $course course object
* @param stdClass $cm course module object
* @param stdClass $context context object
* @since Moodle 3.0
*/
function chat_view($chat, $course, $cm, $context) {
// Trigger course_module_viewed event.
$params = array(
'context' => $context,
'objectid' => $chat->id
);
$event = \mod_chat\event\course_module_viewed::create($params);
$event->add_record_snapshot('course_modules', $cm);
$event->add_record_snapshot('course', $course);
$event->add_record_snapshot('chat', $chat);
$event->trigger();
// Completion.
$completion = new completion_info($course);
$completion->set_module_viewed($cm);
}
/**
* This function receives a calendar event and returns the action associated with it, or null if there is none.
*
* This is used by block_myoverview in order to display the event appropriately. If null is returned then the event
* is not displayed on the block.
*
* @param calendar_event $event
* @param \core_calendar\action_factory $factory
* @param int $userid User id to use for all capability checks, etc. Set to 0 for current user (default).
* @return \core_calendar\local\event\entities\action_interface|null
*/
function mod_chat_core_calendar_provide_event_action(calendar_event $event,
\core_calendar\action_factory $factory,
int $userid = 0) {
global $USER, $DB;
if ($userid) {
$user = core_user::get_user($userid, 'id, timezone');
} else {
$user = $USER;
}
$cm = get_fast_modinfo($event->courseid, $user->id)->instances['chat'][$event->instance];
if (!$cm->uservisible) {
// The module is not visible to the user for any reason.
return null;
}
$completion = new \completion_info($cm->get_course());
$completiondata = $completion->get_data($cm, false, $userid);
if ($completiondata->completionstate != COMPLETION_INCOMPLETE) {
return null;
}
$chattime = $DB->get_field('chat', 'chattime', array('id' => $event->instance));
$usertimezone = core_date::get_user_timezone($user);
$chattimemidnight = usergetmidnight($chattime, $usertimezone);
$todaymidnight = usergetmidnight(time(), $usertimezone);
if ($chattime < $todaymidnight) {
// The chat is before today. Do not show at all.
return null;
} else {
// The chat is actionable if it is at some point today.
$actionable = $chattimemidnight == $todaymidnight;
return $factory->create_instance(
get_string('enterchat', 'chat'),
new \moodle_url('/mod/chat/view.php', array('id' => $cm->id)),
1,
$actionable
);
}
}
/**
* Given a set of messages for a chat, return the completed chat sessions (including optionally not completed ones).
*
* @param array $messages list of messages from a chat. It is assumed that these are sorted by timestamp in DESCENDING order.
* @param bool $showall whether to include incomplete sessions or not
* @return array the list of sessions
* @since Moodle 3.5
*/
function chat_get_sessions($messages, $showall = false) {
$sessions = [];
$start = 0;
$end = 0;
$sessiontimes = [];
// Group messages by session times.
foreach ($messages as $message) {
// Initialise values start-end times if necessary.
if (empty($start)) {
$start = $message->timestamp;
}
if (empty($end)) {
$end = $message->timestamp;
}
// If this message's timestamp has been more than the gap, it means it's been idle.
if ($start - $message->timestamp > CHAT_SESSION_GAP) {
// Mark this as the session end of the next session.
$end = $message->timestamp;
}
// Use this time as the session's start (until it gets overwritten on the next iteration, if needed).
$start = $message->timestamp;
// Set this start-end pair in our list of session times.
$sessiontimes[$end]['sessionstart'] = $start;
if (!isset($sessiontimes[$end]['sessionend'])) {
$sessiontimes[$end]['sessionend'] = $end;
}
if ($message->userid && !$message->issystem) {
if (!isset($sessiontimes[$end]['sessionusers'][$message->userid])) {
$sessiontimes[$end]['sessionusers'][$message->userid] = 1;
} else {
$sessiontimes[$end]['sessionusers'][$message->userid]++;
}
}
}
// Go through each session time and prepare the session data to be returned.
foreach ($sessiontimes as $sessionend => $sessiondata) {
if (!isset($sessiondata['sessionusers'])) {
$sessiondata['sessionusers'] = [];
}
$sessionusers = $sessiondata['sessionusers'];
$sessionstart = $sessiondata['sessionstart'];
$iscomplete = $sessionend - $sessionstart > 60 && count($sessionusers) > 1;
if ($showall || $iscomplete) {
$sessions[] = (object) ($sessiondata + ['iscomplete' => $iscomplete]);
}
}
return $sessions;
}
/**
* Return the messages of the given chat session.
*
* @param int $chatid the chat id
* @param mixed $group false if groups not used, int if groups used, 0 means all groups
* @param int $start the session start timestamp (0 to not filter by time)
* @param int $end the session end timestamp (0 to not filter by time)
* @param string $sort an order to sort the results in (optional, a valid SQL ORDER BY parameter)
* @return array session messages
* @since Moodle 3.5
*/
function chat_get_session_messages($chatid, $group = false, $start = 0, $end = 0, $sort = '') {
global $DB;
$params = array('chatid' => $chatid);
// If the user is allocated to a group, only show messages from people in the same group, or no group.
if ($group) {
$groupselect = " AND (groupid = :currentgroup OR groupid = 0)";
$params['currentgroup'] = $group;
} else {
$groupselect = "";
}
$select = "chatid = :chatid $groupselect";
if (!empty($start)) {
$select .= ' AND timestamp >= :start';
$params['start'] = $start;
}
if (!empty($end)) {
$select .= ' AND timestamp <= :end';
$params['end'] = $end;
}
return $DB->get_records_select('chat_messages', $select, $params, $sort);
}
/**
* Add a get_coursemodule_info function in case chat instance wants to add 'extra' information
* for the course (see resource).
*
* Given a course_module object, this function returns any "extra" information that may be needed
* when printing this activity in a course listing. See get_array_of_activities() in course/lib.php.
*
* @param stdClass $coursemodule The coursemodule object (record).
* @return cached_cm_info An object on information that the courses
* will know about (most noticeably, an icon).
*/
function chat_get_coursemodule_info($coursemodule) {
global $DB;
$dbparams = ['id' => $coursemodule->instance];
$fields = 'id, name, intro, introformat, chattime, schedule';
if (!$chat = $DB->get_record('chat', $dbparams, $fields)) {
return false;
}
$result = new cached_cm_info();
$result->name = $chat->name;
if ($coursemodule->showdescription) {
// Convert intro to html. Do not filter cached version, filters run at display time.
$result->content = format_module_intro('chat', $chat, $coursemodule->id, false);
}
// Populate some other values that can be used in calendar or on dashboard.
if ($chat->chattime) {
$result->customdata['chattime'] = $chat->chattime;
$result->customdata['schedule'] = $chat->schedule;
}
return $result;
}
