blocks/online_users/block_online_users.php

   1 <?php //$Id$
   2
   3 /**
   4  * This block needs to be reworked.
   5  * The new roles system does away with the concepts of rigid student and
   6  * teacher roles.
   7  */
   8 class block_online_users extends block_base {
   9     function init() {
  10         $this->title = get_string('blockname','block_online_users');
  11         $this->version = 2006030100;
  12     }
  13
  14     function has_config() {return true;}
  15
  16     function get_content() {
  17         global $USER, $CFG, $COURSE;
  18
  19         if ($this->content !== NULL) {
  20             return $this->content;
  21         }
  22
  23         $this->content = new stdClass;
  24         $this->content->text = '';
  25         $this->content->footer = '';
  26
  27         if (empty($this->instance)) {
  28             return $this->content;
  29         }
  30
  31         $timetoshowusers = 300; //Seconds default
  32         if (isset($CFG->block_online_users_timetosee)) {
  33             $timetoshowusers = $CFG->block_online_users_timetosee * 60;
  34         }
  35         $timefrom = 100 * floor((time()-$timetoshowusers) / 100); // Round to nearest 100 seconds for better query cache
  36
  37         // Get context so we can check capabilities.
  38         $context = get_context_instance(CONTEXT_COURSE, $COURSE->id);
  39
  40         //Calculate if we are in separate groups
  41         $isseparategroups = ($COURSE->groupmode == SEPARATEGROUPS
  42                              && $COURSE->groupmodeforce
  43                              && !has_capability('moodle/site:accessallgroups', $context));
  44
  45         //Get the user current group
  46         $currentgroup = $isseparategroups ? get_and_set_current_group($COURSE, groupmode($COURSE)) : NULL;
  47
  48         $groupmembers = "";
  49         $groupselect = "";
  50
  51         //Add this to the SQL to show only group users
  52         if ($currentgroup !== NULL) {
  53             $groupmembers = ', '.groups_members_from_sql(); //TODO: ", {$CFG->prefix}groups_members gm ";
  54             $groupselect = ' AND '.groups_members_where_sql($currentgroup, 'u.id'); //" AND u.id = gm.userid AND gm.groupid = '$currentgroup'";
  55         }
  56
  57         if ($COURSE->id == SITEID) {  // Site-level
  58             $courseselect = '';
  59             $timeselect = "AND (ul.timeaccess > $timefrom OR u.lastaccess > $timefrom)";
  60         } else {
  61             $courseselect = "AND ul.courseid = '".$COURSE->id."'";
  62             $timeselect = "AND ul.timeaccess > $timefrom";
  63         }
  64
  65         $users = array();
  66
  67         $SQL = "SELECT u.id, u.username, u.firstname, u.lastname, u.picture, u.lastaccess, ul.timeaccess
  68                 FROM {$CFG->prefix}user_lastaccess ul,
  69                      {$CFG->prefix}user u
  70                      $groupmembers
  71                 WHERE
  72                       ul.userid = u.id
  73                       $courseselect
  74                       $timeselect
  75                       $groupselect
  76                 GROUP BY u.id, u.username, u.firstname, u.lastname, u.picture, u.lastaccess, ul.timeaccess
  77                 ORDER BY ul.timeaccess DESC";
  78
  79
  80
  81         $pcontext = get_related_contexts_string($context);
  82
  83         if ($pusers = get_records_sql($SQL, 0, 50)) {   // We'll just take the most recent 50 maximum
  84             foreach ($pusers as $puser) {
  85
  86                 // if current user can't view hidden role assignment in this context and
  87                 // user has a hidden role assigned at this context or any parent contexts,
  88                 // ignore this user
  89
  90                 $SQL = "SELECT id,id FROM {$CFG->prefix}role_assignments
  91                         WHERE userid = $puser->id
  92                         AND contextid $pcontext
  93                         AND hidden = 1";
  94
  95                 if (!has_capability('moodle/role:viewhiddenassigns', $context) && record_exists_sql($SQL)) {
  96                     // can't see this user as the current user has no capability
  97                     // and this user has a hidden assignment at this context or higher
  98                     continue;
  99                 }
 100
 101                 $puser->fullname = fullname($puser);
 102                 $users[$puser->id] = $puser;
 103             }
 104         }
 105
 106         //Calculate minutes
 107         $minutes  = floor($timetoshowusers/60);
 108
 109         $this->content->text = "<div class=\"info\">(".get_string("periodnminutes","block_online_users",$minutes).")</div>";
 110
 111         //Now, we have in users, the list of users to show
 112         //Because they are online
 113         if (!empty($users)) {
 114             //Accessibility: Don't want 'Alt' text for the user picture; DO want it for the envelope/message link (existing lang string).
 115             //Accessibility: Converted <div> to <ul>, inherit existing classes & styles.
 116             $this->content->text .= "<ul class='list'>\n";
 117             foreach ($users as $user) {
 118                 $this->content->text .= '<li class="listentry">';
 119                 $timeago = format_time(time() - max($user->timeaccess, $user->lastaccess)); //bruno to calculate correctly on frontpage
 120                 if ($user->username == 'guest') {
 121                     $this->content->text .= '<div class="user">'.print_user_picture($user->id, $COURSE->id, $user->picture, 16, true, false, '', false);
 122                     $this->content->text .= get_string('guestuser').'</div>';
 123
 124                 } else {
 125                     $this->content->text .= '<div class="user"><a href="'.$CFG->wwwroot.'/user/view.php?id='.$user->id.'&amp;course='.$COURSE->id.'" title="'.$timeago.'">';
 126                     $this->content->text .= print_user_picture($user->id, $COURSE->id, $user->picture, 16, true, false, '', false);
 127                     $this->content->text .= $user->fullname.'</a></div>';
 128                 }
 129                 if (!empty($USER->id) and ($USER->id != $user->id) and !empty($CFG->messaging) and
 130                     !isguest() and $user->username != 'guest') {  // Only when logged in and messaging active etc
 131                     $this->content->text .= '<div class="message"><a title="'.get_string('messageselectadd').'" href="'.$CFG->wwwroot.'/message/discussion.php?id='.$user->id.'" onclick="this.target=\'message_'.$user->id.'\';return openpopup(\'/message/discussion.php?id='.$user->id.'\', \'message_'.$user->id.'\', \'menubar=0,location=0,scrollbars,status,resizable,width=400,height=500\', 0);">'
 132                         .'<img class="iconsmall" src="'.$CFG->pixpath.'/t/message.gif" alt="'. get_string('messageselectadd') .'" /></a></div>';
 133                 }
 134                 $this->content->text .= "</li>\n";
 135             }
 136             $this->content->text .= '</ul><div class="clearer"><!-- --></div>';
 137         } else {
 138             $this->content->text .= "<div class=\"info\">".get_string("none")."</div>";
 139         }
 140
 141         return $this->content;
 142     }
 143 }
 144
 145 ?>