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<?php
/**
* This block needs to be reworked.
* The new roles system does away with the concepts of rigid student and
* teacher roles.
*/
class block_online_users extends block_base {
function init() {
$this->title = get_string('pluginname','block_online_users');
}
function has_config() {return true;}
function get_content() {
global $USER, $CFG, $DB, $OUTPUT;
if ($this->content !== NULL) {
return $this->content;
}
$this->content = new stdClass;
$this->content->text = '';
$this->content->footer = '';
if (empty($this->instance)) {
return $this->content;
}
$timetoshowusers = 300; //Seconds default
if (isset($CFG->block_online_users_timetosee)) {
$timetoshowusers = $CFG->block_online_users_timetosee * 60;
}
$now = time();
$timefrom = 100 * floor(($now - $timetoshowusers) / 100); // Round to nearest 100 seconds for better query cache
//Calculate if we are in separate groups
$isseparategroups = ($this->page->course->groupmode == SEPARATEGROUPS
&& $this->page->course->groupmodeforce
&& !has_capability('moodle/site:accessallgroups', $this->page->context));
//Get the user current group
$currentgroup = $isseparategroups ? groups_get_course_group($this->page->course) : NULL;
$groupmembers = "";
$groupselect = "";
$params = array();
//Add this to the SQL to show only group users
if ($currentgroup !== NULL) {
$groupmembers = ", {groups_members} gm";
$groupselect = "AND u.id = gm.userid AND gm.groupid = :currentgroup";
$params['currentgroup'] = $currentgroup;
}
$userfields = user_picture::fields('u', array('username'));
$params['now'] = $now;
$params['timefrom'] = $timefrom;
if ($this->page->course->id == SITEID or $this->page->context->contextlevel < CONTEXT_COURSE) { // Site-level
$sql = "SELECT $userfields, MAX(u.lastaccess) AS lastaccess
FROM {user} u $groupmembers
WHERE u.lastaccess > :timefrom
AND u.lastaccess <= :now
AND u.deleted = 0
$groupselect
GROUP BY $userfields
ORDER BY lastaccess DESC ";
$csql = "SELECT COUNT(u.id)
FROM {user} u $groupmembers
WHERE u.lastaccess > :timefrom
AND u.lastaccess <= :now
AND u.deleted = 0
$groupselect";
} else {
// Course level - show only enrolled users for now
// TODO: add a new capability for viewing of all users (guests+enrolled+viewing)
list($esqljoin, $eparams) = get_enrolled_sql($this->page->context);
$params = array_merge($params, $eparams);
$sql = "SELECT $userfields, MAX(ul.timeaccess) AS lastaccess
FROM {user_lastaccess} ul $groupmembers, {user} u
JOIN ($esqljoin) euj ON euj.id = u.id
WHERE ul.timeaccess > :timefrom
AND u.id = ul.userid
AND ul.courseid = :courseid
AND ul.timeaccess <= :now
AND u.deleted = 0
$groupselect
GROUP BY $userfields
ORDER BY lastaccess DESC";
$csql = "SELECT COUNT(u.id)
FROM {user_lastaccess} ul $groupmembers, {user} u
JOIN ($esqljoin) euj ON euj.id = u.id
WHERE ul.timeaccess > :timefrom
AND u.id = ul.userid
AND ul.courseid = :courseid
AND ul.timeaccess <= :now
AND u.deleted = 0
$groupselect";
$params['courseid'] = $this->page->course->id;
}
//Calculate minutes
$minutes = floor($timetoshowusers/60);
// Verify if we can see the list of users, if not just print number of users
if (!has_capability('block/online_users:viewlist', $this->page->context)) {
if (!$usercount = $DB->count_records_sql($csql, $params)) {
$usercount = get_string("none");
}
$this->content->text = "<div class=\"info\">".get_string("periodnminutes","block_online_users",$minutes).": $usercount</div>";
return $this->content;
}
if ($users = $DB->get_records_sql($sql, $params, 0, 50)) { // We'll just take the most recent 50 maximum
foreach ($users as $user) {
$users[$user->id]->fullname = fullname($user);
}
} else {
$users = array();
}
if (count($users) < 50) {
$usercount = "";
} else {
$usercount = $DB->count_records_sql($csql, $params);
$usercount = ": $usercount";
}
$this->content->text = "<div class=\"info\">(".get_string("periodnminutes","block_online_users",$minutes)."$usercount)</div>";
//Now, we have in users, the list of users to show
//Because they are online
if (!empty($users)) {
//Accessibility: Don't want 'Alt' text for the user picture; DO want it for the envelope/message link (existing lang string).
//Accessibility: Converted <div> to <ul>, inherit existing classes & styles.
$this->content->text .= "<ul class='list'>\n";
if (isloggedin() && has_capability('moodle/site:sendmessage', $this->page->context)
&& !empty($CFG->messaging) && !isguestuser()) {
$canshowicon = true;
} else {
$canshowicon = false;
}
foreach ($users as $user) {
$this->content->text .= '<li class="listentry">';
$timeago = format_time($now - $user->lastaccess); //bruno to calculate correctly on frontpage
if (isguestuser($user)) {
$this->content->text .= '<div class="user">'.$OUTPUT->user_picture($user, array('size'=>16));
$this->content->text .= get_string('guestuser').'</div>';
} else {
$this->content->text .= '<div class="user">'.$OUTPUT->user_picture($user, array('size'=>16));
$this->content->text .= '<a href="'.$CFG->wwwroot.'/user/view.php?id='.$user->id.'&amp;course='.$this->page->course->id.'" title="'.$timeago.'">'.$user->fullname.'</a></div>';
}
if ($canshowicon and ($USER->id != $user->id) and !isguestuser($user)) { // Only when logged in and messaging active etc
$anchortagcontents = '<img class="iconsmall" src="'.$OUTPUT->pix_url('t/message') . '" alt="'. get_string('messageselectadd') .'" />';
$anchortag = '<a href="'.$CFG->wwwroot.'/message/index.php?id='.$user->id.'" title="'.get_string('messageselectadd').'">'.$anchortagcontents .'</a>';
$this->content->text .= '<div class="message">'.$anchortag.'</div>';
}
$this->content->text .= "</li>\n";
}
$this->content->text .= '</ul><div class="clearer"><!-- --></div>';
} else {
$this->content->text .= "<div class=\"info\">".get_string("none")."</div>";
}
return $this->content;
}
}
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