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moodle/mod/chat/lib.php
dongsheng 5a2a53316f MDL-14129, remove all the other error() call
2008-04-04 02:54:20 +00:00

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<?php // $Id$
/// Library of functions and constants for module chat
require_once($CFG->libdir.'/pagelib.php');
// The HTML head for the message window to start with (<!-- nix --> is used to get some browsers starting with output
$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 bgcolor=\"#FFFFFF\">\n\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n";
// The HTML head for the message window to start with (with js scrolling)
$CHAT_HTMLHEAD_JS = "<!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\">\n//<![CDATA[\nfunction move()\n{\nif (scroll_active) window.scroll(1,400000);\nwindow.setTimeout(\"move()\",100);\n}\nscroll_active = true;\nmove();\n//]]>\n</script>\n</head>\n<body bgcolor=\"#FFFFFF\" onBlur=\"scroll_active = true\" onFocus=\"scroll_active = false\">\n\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n";
// The HTML code for standard empty pages (e.g. if a user was kicked 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 bgcolor=\"#FFFFFF\"></body></html>";
// The HTML head for the message input page
$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 bgcolor=\"#FFFFFF\">";
// The HTML code for the message input page, with JavaScript
$CHAT_HTMLHEAD_MSGINPUT_JS = "<!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>\n<script type=\"text/javascript\">\n//<![CDATA[\nscroll_active = true;\nfunction empty_field_and_submit()\n{\ndocument.fdummy.arsc_message.value=document.f.arsc_message.value;\ndocument.fdummy.submit();\ndocument.f.arsc_message.focus();\ndocument.f.arsc_message.select();\nreturn false;\n}\n//]]>\n</script>\n</head><body bgcolor=\"#FFFFFF\" OnLoad=\"document.f.arsc_message.focus();document.f.arsc_message.select();\">";
// Dummy data that gets output to the browser as needed, in order to make it show output
$CHAT_DUMMY_DATA = "<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n<!-- nix -->\n";
function chat_add_instance($chat) {
/// Given an object containing all the necessary data,
/// (defined by the form in mod.html) this function
/// will create a new instance and return the id number
/// of the new instance.
$chat->timemodified = time();
if ($returnid = insert_record("chat", $chat)) {
$event = NULL;
$event->name = $chat->name;
$event->description = $chat->intro;
$event->courseid = $chat->course;
$event->groupid = 0;
$event->userid = 0;
$event->modulename = 'chat';
$event->instance = $returnid;
$event->eventtype = $chat->schedule;
$event->timestart = $chat->chattime;
$event->timeduration = 0;
add_event($event);
}
return $returnid;
}
function chat_update_instance($chat) {
/// Given an object containing all the necessary data,
/// (defined by the form in mod.html) this function
/// will update an existing instance with new data.
$chat->timemodified = time();
$chat->id = $chat->instance;
if ($returnid = update_record("chat", $chat)) {
$event = new object();
if ($event->id = get_field('event', 'id', 'modulename', 'chat', 'instance', $chat->id)) {
$event->name = $chat->name;
$event->description = $chat->intro;
$event->timestart = $chat->chattime;
update_event($event);
}
}
return $returnid;
}
function chat_delete_instance($id) {
/// Given an ID of an instance of this module,
/// this function will permanently delete the instance
/// and any data that depends on it.
if (! $chat = get_record('chat', 'id', $id)) {
return false;
}
$result = true;
# Delete any dependent records here #
if (! delete_records('chat', 'id', $chat->id)) {
$result = false;
}
if (! delete_records('chat_messages', 'chatid', $chat->id)) {
$result = false;
}
if (! delete_records('chat_users', 'chatid', $chat->id)) {
$result = false;
}
$pagetypes = page_import_types('mod/chat/');
foreach($pagetypes as $pagetype) {
if(!delete_records('block_instance', 'pageid', $chat->id, 'pagetype', $pagetype)) {
$result = false;
}
}
if (! delete_records('event', 'modulename', 'chat', 'instance', $chat->id)) {
$result = false;
}
return $result;
}
function chat_user_outline($course, $user, $mod, $chat) {
/// Return a small object with summary information about what a
/// user has done with a given particular instance of this module
/// Used for user activity reports.
/// $return->time = the time they did it
/// $return->info = a short text description
$return = NULL;
return $return;
}
function chat_user_complete($course, $user, $mod, $chat) {
/// Print a detailed representation of what a user has done with
/// a given particular instance of this module, for user activity reports.
return true;
}
function chat_print_recent_activity($course, $viewfullnames, $timestart) {
/// Given a course and a date, prints a summary of all chat rooms past and present
/// This function is called from course/lib.php: print_recent_activity()
global $CFG, $USER;
// this is approximate only, but it is really fast ;-)
$timeout = $CFG->chat_old_ping * 10;
if (!$mcms = get_records_sql("SELECT cm.id, MAX(chm.timestamp) AS lasttime
FROM {$CFG->prefix}course_modules cm
JOIN {$CFG->prefix}modules md ON md.id = cm.module
JOIN {$CFG->prefix}chat ch ON ch.id = cm.instance
JOIN {$CFG->prefix}chat_messages chm ON chm.chatid = ch.id
WHERE chm.timestamp > $timestart AND ch.course = {$course->id} AND md.name = 'chat'
GROUP BY cm.id
ORDER BY lasttime ASC")) {
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];
$cm->lasttime = $mcm->lasttime;
if (!$modinfo->cms[$cm->id]->uservisible) {
continue;
}
if (groups_get_activity_groupmode($cm) != SEPARATEGROUPS
or has_capability('moodle/site:accessallgroups', get_context_instance(CONTEXT_MODULE, $cm->id))) {
if ($timeout > time() - $cm->lasttime) {
$current[] = $cm;
} else {
$past[] = $cm;
}
continue;
}
if (is_null($modinfo->groups)) {
$modinfo->groups = groups_get_user_groups($course->id); // load all my groups and cache it in modinfo
}
// verify groups in separate mode
if (!$mygroupids = $modinfo->groups[$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
// only minor problem is that the order will not be correct
$mygroupids = implode(',', $mygroupids);
$cm->mygroupids = $mygroupids;
if (!$mcm = get_record_sql("SELECT cm.id, MAX(chm.timestamp) AS lasttime
FROM {$CFG->prefix}course_modules cm
JOIN {$CFG->prefix}chat ch ON ch.id = cm.instance
JOIN {$CFG->prefix}chat_messages chm ON chm.chatid = ch.id
WHERE chm.timestamp > $timestart AND cm.id = {$cm->id} AND
(chm.groupid IN ($mygroupids) OR chm.groupid = 0)
GROUP BY cm.id")) {
continue;
}
$cm->lasttime = $mcm->lasttime;
if ($timeout > time() - $cm->lasttime) {
$current[] = $cm;
} else {
$past[] = $cm;
}
}
if (!$past and !$current) {
return false;
}
$strftimerecent = get_string('strftimerecent');
if ($past) {
print_headline(get_string('pastchats', 'chat').':');
foreach ($past as $cm) {
$link = $CFG->wwwroot.'/mod/chat/view.php?id='.$cm->id;
$date = userdate($cm->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) {
print_headline(get_string('currentchats', 'chat').':');
$oldest = floor((time()-$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
$timeout = "AND (chu.version<>'basic' AND chu.lastping>$timeold) OR (chu.version='basic' AND chu.lastping>$timeoldext)";
foreach ($current as $cm) {
//count users first
if (isset($cm->mygroupids)) {
$groupselect = "AND (chu.groupid IN ({$cm->mygroupids}) OR chu.groupid = 0)";
} else {
$groupselect = "";
}
if (!$users = get_records_sql("SELECT u.id, u.firstname, u.lastname, u.email, u.picture
FROM {$CFG->prefix}course_modules cm
JOIN {$CFG->prefix}chat ch ON ch.id = cm.instance
JOIN {$CFG->prefix}chat_users chu ON chu.chatid = ch.id
JOIN {$CFG->prefix}user u ON u.id = chu.userid
WHERE cm.id = {$cm->id} $timeout $groupselect
GROUP BY u.id, u.firstname, u.lastname, u.email, u.picture")) {
}
$link = $CFG->wwwroot.'/mod/chat/view.php?id='.$cm->id;
$date = userdate($cm->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;
}
function chat_cron () {
/// Function to be run periodically according to the moodle cron
/// This function searches for things that need to be done, such
/// as sending out mail, toggling flags etc ...
global $CFG;
chat_update_chat_times();
chat_delete_old_users();
/// Delete old messages with a
/// single SQL query.
$subselect = "SELECT c.keepdays
FROM {$CFG->prefix}chat c
WHERE c.id = {$CFG->prefix}chat_messages.chatid";
$sql = "DELETE
FROM {$CFG->prefix}chat_messages
WHERE ($subselect) > 0 AND timestamp < ( ".time()." -($subselect) * 24 * 3600)";
execute_sql($sql, false);
return true;
}
function chat_get_participants($chatid, $groupid=0) {
//Returns the users with data in one chat
//(users with records in chat_messages, students)
global $CFG;
if ($groupid) {
$groupselect = " AND (c.groupid='$groupid' OR c.groupid='0')";
} else {
$groupselect = "";
}
//Get students
$students = get_records_sql("SELECT DISTINCT u.id, u.id
FROM {$CFG->prefix}user u,
{$CFG->prefix}chat_messages c
WHERE c.chatid = '$chatid' $groupselect
AND u.id = c.userid");
//Return students array (it contains an array of unique users)
return ($students);
}
function chat_refresh_events($courseid = 0) {
// This standard function will check all instances of this module
// and make sure there are up-to-date events created for each of them.
// If courseid = 0, then every chat event in the site is checked, else
// only chat events belonging to the course specified are checked.
// This function is used, in its new format, by restore_refresh_events()
if ($courseid) {
if (! $chats = get_records("chat", "course", $courseid)) {
return true;
}
} else {
if (! $chats = get_records("chat")) {
return true;
}
}
$moduleid = get_field('modules', 'id', 'name', 'chat');
foreach ($chats as $chat) {
$event = NULL;
$event->name = addslashes($chat->name);
$event->description = addslashes($chat->intro);
$event->timestart = $chat->chattime;
if ($event->id = get_field('event', 'id', 'modulename', 'chat', 'instance', $chat->id)) {
update_event($event);
} else {
$event->courseid = $chat->course;
$event->groupid = 0;
$event->userid = 0;
$event->modulename = 'chat';
$event->instance = $chat->id;
$event->eventtype = $chat->schedule;
$event->timeduration = 0;
$event->visible = get_field('course_modules', 'visible', 'module', $moduleid, 'instance', $chat->id);
add_event($event);
}
}
return true;
}
//////////////////////////////////////////////////////////////////////
/// Functions that require some SQL
function chat_get_users($chatid, $groupid=0, $groupingid=0) {
global $CFG;
if ($groupid) {
$groupselect = " AND (c.groupid='$groupid' OR c.groupid='0')";
} else {
$groupselect = "";
}
if (!empty($CFG->enablegroupings) && !(empty($groupingid))) {
$groupingjoin = "INNER JOIN {$CFG->prefix}groups_members gm ON u.id = gm.userid
INNER JOIN {$CFG->prefix}groupings_groups gg ON gm.groupid = gg.groupid AND gg.groupingid = $groupingid ";
} else {
$groupingjoin = '';
}
return get_records_sql("SELECT DISTINCT u.id, u.firstname, u.lastname, u.picture, c.lastmessageping, c.firstping, u.imagealt
FROM {$CFG->prefix}chat_users c
INNER JOIN {$CFG->prefix}user u ON u.id = c.userid
$groupingjoin
WHERE c.chatid = '$chatid'
$groupselect
ORDER BY c.firstping ASC");
}
function chat_get_latest_message($chatid, $groupid=0) {
/// Efficient way to extract just the latest message
/// Uses ADOdb directly instead of get_record_sql()
/// because the LIMIT command causes problems with
/// the developer debugging in there.
global $db, $CFG;
if ($groupid) {
$groupselect = " AND (groupid='$groupid' OR groupid='0')";
} else {
$groupselect = "";
}
if (!$rs = $db->SelectLimit("SELECT *
FROM {$CFG->prefix}chat_messages
WHERE chatid = '$chatid' $groupselect
ORDER BY timestamp DESC", 1)) {
return false;
}
$result = rs_fetch_record($rs);
rs_close($rs);
return $result;
}
//////////////////////////////////////////////////////////////////////
// login if not already logged in
function chat_login_user($chatid, $version, $groupid, $course) {
global $USER;
if (($version != 'sockets') and $chatuser = get_record_select('chat_users', "chatid='$chatid' AND userid='$USER->id' AND groupid='$groupid'")) {
$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)) {
$chatuser->ip = getremoteaddr();
if (empty($chatuser->ip)) {
$chatuser->ip = '';
}
}
if (($chatuser->course != $course->id)
or ($chatuser->userid != $USER->id)) {
return false;
}
if (!update_record('chat_users', $chatuser)) {
return false;
}
} else {
$chatuser = new object();
$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)) {
$chatuser->ip = getremoteaddr();
if (empty($chatuser->ip)) {
$chatuser->ip = '';
}
}
if (!insert_record('chat_users', $chatuser)) {
return false;
}
if ($version == 'sockets') {
// do not send 'enter' message, chatd will do it
} else {
$message = new object();
$message->chatid = $chatuser->chatid;
$message->userid = $chatuser->userid;
$message->groupid = $groupid;
$message->message = 'enter';
$message->system = 1;
$message->timestamp = time();
if (!insert_record('chat_messages', $message)) {
print_error('Could not insert a chat message!');
}
}
}
return $chatuser->sid;
}
function chat_delete_old_users() {
// Delete the old and in the way
global $CFG;
$timeold = time() - $CFG->chat_old_ping;
$timeoldext = time() - ($CFG->chat_old_ping*10); // JSless gui_basic needs much longer timeouts
$query = "(version<>'basic' AND lastping<'$timeold') OR (version='basic' AND lastping<'$timeoldext')";
if ($oldusers = get_records_select('chat_users', $query) ) {
delete_records_select('chat_users', $query);
foreach ($oldusers as $olduser) {
$message = new object();
$message->chatid = $olduser->chatid;
$message->userid = $olduser->userid;
$message->groupid = $olduser->groupid;
$message->message = 'exit';
$message->system = 1;
$message->timestamp = time();
if (!insert_record('chat_messages', $message)) {
print_error('Could not insert a chat message!');
}
}
}
}
function chat_update_chat_times($chatid=0) {
/// Updates chat records so that the next chat time is correct
$timenow = time();
if ($chatid) {
if (!$chats[] = get_record_select("chat", "id = '$chatid' AND chattime <= '$timenow' AND schedule > '0'")) {
return;
}
} else {
if (!$chats = get_records_select("chat", "chattime <= '$timenow' AND schedule > '0'")) {
return;
}
}
foreach ($chats as $chat) {
unset($chat->name);
unset($chat->intro);
switch ($chat->schedule) {
case 1: // Single event - turn off schedule and disable
$chat->chattime = 0;
$chat->schedule = 0;
break;
case 2: // Repeat daily
while ($chat->chattime <= $timenow) {
$chat->chattime += 24 * 3600;
}
break;
case 3: // Repeat weekly
while ($chat->chattime <= $timenow) {
$chat->chattime += 7 * 24 * 3600;
}
break;
}
update_record("chat", $chat);
$event = NULL; // Update calendar too
$cond = "modulename='chat' AND instance = {$chat->id}
AND timestart != {$chat->chattime}";
if ($event->id = get_field_select('event', 'id', $cond)) {
$event->timestart = $chat->chattime;
update_event($event);
}
}
}
function chat_format_message_manually($message, $courseid, $sender, $currentuser, $chat_lastrow=NULL) {
global $CFG, $USER;
$output = new object();
$output->beep = false; // by default
$output->refreshusers = false; // by default
// Use get_user_timezone() to find the correct timezone for displaying this message:
// It's either the current user's timezone or else decided by some Moodle config setting
// First, "reset" $USER->timezone (which could have been set by a previous call to here)
// because otherwise the value for the previous $currentuser will take precedence over $CFG->timezone
$USER->timezone = 99;
$tz = get_user_timezone($currentuser->timezone);
// Before formatting the message time string, set $USER->timezone to the above.
// This will allow dst_offset_on (called by userdate) to work correctly, otherwise the
// message times appear off because DST is not taken into account when it should be.
$USER->timezone = $tz;
$message->strtime = userdate($message->timestamp, get_string('strftimemessage', 'chat'), $tz);
$message->picture = print_user_picture($sender->id, 0, $sender->picture, false, true, false);
if ($courseid) {
$message->picture = "<a onclick=\"window.open('$CFG->wwwroot/user/view.php?id=$sender->id&amp;course=$courseid')\" href=\"$CFG->wwwroot/user/view.php?id=$sender->id&amp;course=$courseid\">$message->picture</a>";
}
//Calculate the row class
if ($chat_lastrow !== NULL) {
$rowclass = ' class="r'.$chat_lastrow.'" ';
} else {
$rowclass = '';
}
// Start processing the message
if(!empty($message->system)) {
// 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><td class="text">';
$output->html .= '<span class="event">'.$output->text.'</span></td></tr></table>';
$output->basic = '<dl><dt class="event">'.$message->strtime.': '.get_string('message'.$message->message, 'chat', fullname($sender)).'</dt></dl>';
if($message->message == 'exit' or $message->message == 'enter') {
$output->refreshusers = true; //force user panel refresh ASAP
}
return $output;
}
// It's not a system event
$text = $message->message;
/// Parse the text to clean and filter it
$options = new object();
$options->para = false;
$text = format_text($text, FORMAT_MOODLE, $options, $courseid);
// And now check for special cases
$special = false;
if (substr($text, 0, 5) == 'beep ') {
/// It's a beep!
$special = true;
$beepwho = trim(substr($text, 5));
if ($beepwho == 'all') { // everyone
$outinfo = $message->strtime.': '.get_string('messagebeepseveryone', 'chat', fullname($sender));
$outmain = '';
$output->beep = true; // (eventually this should be set to
// to a filename uploaded by the user)
} else if ($beepwho == $currentuser->id) { // current user
$outinfo = $message->strtime.': '.get_string('messagebeepsyou', 'chat', fullname($sender));
$outmain = '';
$output->beep = true;
} else { //something is not caught?
return false;
}
} else if (substr($text, 0, 1) == '/') { /// It's a user command
if (trim(substr($text, 0, 4)) == '/me') {
$special = true;
$outinfo = $message->strtime;
$outmain = $sender->firstname.' '.substr($text, 4);
}
}
if(!$special) {
$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><td class=\"text\">";
$output->html .= "<span class=\"title\">$outinfo</span>";
if ($outmain) {
$output->html .= ": $outmain";
$output->basic = '<dl><dt class="title">'.$outinfo.':</dt><dd class="text">'.$outmain.'</dd></dl>';
} else {
$output->basic = '<dl><dt class="title">'.$outinfo.'</dt></dl>';
}
$output->html .= "</td></tr></table>";
return $output;
}
function chat_format_message($message, $courseid, $currentuser, $chat_lastrow=NULL) {
/// Given a message object full of information, this function
/// formats it appropriately into text and html, then
/// returns the formatted data.
static $users; // Cache user lookups
if (isset($users[$message->userid])) {
$user = $users[$message->userid];
} else if ($user = get_record('user', 'id', $message->userid, '','','','','id,picture,firstname,lastname')) {
$users[$message->userid] = $user;
} else {
return NULL;
}
return chat_format_message_manually($message, $courseid, $user, $currentuser, $chat_lastrow);
}
function chat_get_view_actions() {
return array('view','view all','report');
}
function chat_get_post_actions() {
return array('talk');
}
function chat_print_overview($courses, &$htmlarray) {
global $USER, $CFG;
if (empty($courses) || !is_array($courses) || count($courses) == 0) {
return array();
}
if (!$chats = get_all_instances_in_courses('chat',$courses)) {
return;
}
$strchat = get_string('modulename', 'chat');
$strnextsession = get_string('nextsession', 'chat');
foreach ($chats as $chat) {
if ($chat->chattime and $chat->schedule) { // A chat is scheduled
$str = '<div class="chat overview"><div class="name">'.
$strchat.': <a '.($chat->visible?'':' class="dimmed"').
' href="'.$CFG->wwwroot.'/mod/chat/view.php?id='.$chat->coursemodule.'">'.
$chat->name.'</a></div>';
$str .= '<div class="info">'.$strnextsession.': '.userdate($chat->chattime).'</div></div>';
if (empty($htmlarray[$chat->course]['chat'])) {
$htmlarray[$chat->course]['chat'] = $str;
} else {
$htmlarray[$chat->course]['chat'] .= $str;
}
}
}
}
/**
* Implementation of the function for printing the form elements that control
* whether the course reset functionality affects the chat.
* @param $mform form passed by reference
*/
function chat_reset_course_form_definition(&$mform) {
$mform->addElement('header', 'chatheader', get_string('modulenameplural', 'chat'));
$mform->addElement('advcheckbox', 'reset_chat', get_string('removemessages','chat'));
}
/**
* Course reset form defaults.
*/
function chat_reset_course_form_defaults($course) {
return array('reset_chat'=>1);
}
/**
* Actual implementation of the rest coures functionality, delete all the
* chat messages for course $data->courseid.
* @param $data the data submitted from the reset course.
* @return array status array
*/
function chat_reset_userdata($data) {
global $CFG;
$componentstr = get_string('modulenameplural', 'chat');
$status = array();
if (!empty($data->reset_chat)) {
$chatessql = "SELECT ch.id
FROM {$CFG->prefix}chat ch
WHERE ch.course={$data->courseid}";
delete_records_select('chat_messages', "chatid IN ($chatessql)");
delete_records_select('chat_users', "chatid IN ($chatessql)");
$status[] = array('component'=>$componentstr, 'item'=>get_string('removemessages', 'chat'), 'error'=>false);
}
/// updating dates - shift may be negative too
if ($data->timeshift) {
shift_course_mod_dates('chat', array('chattime'), $data->timeshift, $data->courseid);
$status[] = array('component'=>$componentstr, 'item'=>get_string('datechanged'), 'error'=>false);
}
return $status;
}
?>
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