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 = 2007101509;
  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 = $isseparategroups ? groups_get_course_group($COURSE) : NULL;
  47
  48         $groupmembers = "";
  49         $groupselect = "";
  50
  51         //Add this to the SQL to show only group users
  52         if ($currentgroup !== NULL) {
  53             $groupmembers = ",  {$CFG->prefix}groups_members gm ";
  54             $groupselect = " AND u.id = gm.userid AND gm.groupid = '$currentgroup'";
  55         }
  56
  57         if ($COURSE->id == SITEID) {  // Site-level
  58             $select = "SELECT u.id, u.username, u.firstname, u.lastname, u.picture, max(u.lastaccess) as lastaccess ";
  59             $from = "FROM {$CFG->prefix}user u
  60                           $groupmembers ";
  61             $where = "WHERE u.lastaccess > $timefrom
  62                       $groupselect ";
  63             $order = "ORDER BY lastaccess DESC ";
  64
  65         } else { // Course-level
  66             $courseselect = "AND ul.courseid = '".$COURSE->id."'";
  67             $select = "SELECT u.id, u.username, u.firstname, u.lastname, u.picture, max(ul.timeaccess) as lastaccess ";
  68             $from = "FROM {$CFG->prefix}user_lastaccess ul,
  69                           {$CFG->prefix}user u
  70                           $groupmembers ";
  71             $where =  "WHERE ul.timeaccess > $timefrom
  72                        AND u.id = ul.userid
  73                        AND ul.courseid = $COURSE->id
  74                        $groupselect ";
  75             $order = "ORDER BY lastaccess DESC ";
  76         }
  77
  78         $groupby = "GROUP BY u.id, u.username, u.firstname, u.lastname, u.picture ";
  79
  80         $SQL = $select . $from . $where . $groupby . $order;
  81
  82         $users = array();
  83         $pcontext = get_related_contexts_string($context);
  84
  85         if ($pusers = get_records_sql($SQL, 0, 50)) {   // We'll just take the most recent 50 maximum
  86             $hidden = false;
  87
  88             if (!has_capability('moodle/role:viewhiddenassigns', $context)) {
  89                 // if current user can't view hidden role assignment in this context and
  90                 // user has a hidden role assigned at this context or any parent contexts,
  91                 // ignore this user
  92                 $userids = array_keys($pusers);
  93                 $userids = implode(',', $userids);
  94                 $sql = "SELECT userid
  95                           FROM {$CFG->prefix}role_assignments
  96                          WHERE userid IN ($userids) AND contextid $pcontext AND hidden = 1
  97                       GROUP BY userid";
  98                 $hidden = get_records_sql($sql);
  99             }
 100
 101             foreach ($pusers as $puser) {
 102                 if ($hidden and isset($hidden[$puser->id])) {
 103                     continue;
 104                 }
 105
 106                 $puser->fullname = fullname($puser);
 107                 $users[$puser->id] = $puser;
 108             }
 109         }
 110
 111         //Calculate minutes
 112         $minutes  = floor($timetoshowusers/60);
 113
 114         $this->content->text = "<div class=\"info\">(".get_string("periodnminutes","block_online_users",$minutes).")</div>";
 115
 116         //Now, we have in users, the list of users to show
 117         //Because they are online
 118         if (!empty($users)) {
 119             //Accessibility: Don't want 'Alt' text for the user picture; DO want it for the envelope/message link (existing lang string).
 120             //Accessibility: Converted <div> to <ul>, inherit existing classes & styles.
 121             $this->content->text .= "<ul class='list'>\n";
 122             foreach ($users as $user) {
 123                 $this->content->text .= '<li class="listentry">';
 124                 $timeago = format_time(time() - $user->lastaccess); //bruno to calculate correctly on frontpage
 125                 if ($user->username == 'guest') {
 126                     $this->content->text .= '<div class="user">'.print_user_picture($user->id, $COURSE->id, $user->picture, 16, true, false, '', false);
 127                     $this->content->text .= get_string('guestuser').'</div>';
 128
 129                 } else {
 130                     $this->content->text .= '<div class="user"><a href="'.$CFG->wwwroot.'/user/view.php?id='.$user->id.'&amp;course='.$COURSE->id.'" title="'.$timeago.'">';
 131                     $this->content->text .= print_user_picture($user->id, $COURSE->id, $user->picture, 16, true, false, '', false);
 132                     $this->content->text .= $user->fullname.'</a></div>';
 133                 }
 134                 if (!empty($USER->id) and ($USER->id != $user->id) and !empty($CFG->messaging) and
 135                     !isguest() and $user->username != 'guest') {  // Only when logged in and messaging active etc
 136                     $this->content->text .= '<div class="message"><a title="'.get_string('messageselectadd').'" href="'.$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);">'
 137                         .'<img class="iconsmall" src="'.$CFG->pixpath.'/t/message.gif" alt="'. get_string('messageselectadd') .'" /></a></div>';
 138                 }
 139                 $this->content->text .= "</li>\n";
 140             }
 141             $this->content->text .= '</ul><div class="clearer"><!-- --></div>';
 142         } else {
 143             $this->content->text .= "<div class=\"info\">".get_string("none")."</div>";
 144         }
 145
 146         return $this->content;
 147     }
 148 }
 149
 150 ?>