/**
* Creates a new Hawthorn object.
* @param object $course Moodle course object. If not supplied, uses $COURSE.
* Only required field is ->id.
*/
function get_hawthorn($course = null)
{
global $USER, $COURSE, $CFG;
if ($course == null) {
$course = $COURSE;
}
$context = get_context_instance(CONTEXT_COURSE, $course->id);
// Work out user permissions
$permissions = '';
if (has_capability('block/hawthorn:chat', $context)) {
$permissions .= 'rw';
}
if (has_capability('block/hawthorn:moderate', $context)) {
$permissions .= 'm';
}
if (has_capability('block/hawthorn:admin', $context)) {
$permissions .= 'a';
}
// Get user picture URL
$userpic = print_user_picture($USER, $COURSE->id, NULL, 0, true, false);
$userpic = preg_replace('~^.*src="([^"]*)".*$~', '$1', $userpic);
// Decide key expiry (ms). Usually 1 hour, unless session timeout is lower.
$keyExpiry = 3600000;
if ($CFG->sessiontimeout * 1000 < $keyExpiry) {
// Set expiry to session timeout (note that the JS will make a re-acquire
// request 5 minutes before this)
$keyExpiry = $CFG->sessiontimeout * 1000;
}
// Get server list
$servers = empty($CFG->block_hawthorn_servers) ? array() : explode(',', $CFG->block_hawthorn_servers);
$magicnumber = empty($CFG->block_hawthorn_magicnumber) ? 'xxx' : $CFG->block_hawthorn_magicnumber;
// Construct Hawthorn object
return new hawthorn($magicnumber, $servers, hawthorn::escapeId($USER->username), fullname($USER), $userpic, $permissions, $CFG->wwwroot . '/blocks/hawthorn/hawthorn.js', $CFG->wwwroot . '/blocks/hawthorn/popup.php', $CFG->wwwroot . '/blocks/hawthorn/reacquire.php', false, $keyExpiry);
}
