blocks/online_users/block_online_users.php

   1 <?php
   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('pluginname','block_online_users');
  11     }
  12
  13     function has_config() {return true;}
  14
  15     function get_content() {
  16         global $USER, $CFG, $DB, $OUTPUT;
  17
  18         if ($this->content !== NULL) {
  19             return $this->content;
  20         }
  21
  22         $this->content = new stdClass;
  23         $this->content->text = '';
  24         $this->content->footer = '';
  25
  26         if (empty($this->instance)) {
  27             return $this->content;
  28         }
  29
  30         $timetoshowusers = 300; //Seconds default
  31         if (isset($CFG->block_online_users_timetosee)) {
  32             $timetoshowusers = $CFG->block_online_users_timetosee * 60;
  33         }
  34         $timefrom = 100 * floor((time()-$timetoshowusers) / 100); // Round to nearest 100 seconds for better query cache
  35
  36         //Calculate if we are in separate groups
  37         $isseparategroups = ($this->page->course->groupmode == SEPARATEGROUPS
  38                              && $this->page->course->groupmodeforce
  39                              && !has_capability('moodle/site:accessallgroups', $this->page->context));
  40
  41         //Get the user current group
  42         $currentgroup = $isseparategroups ? groups_get_course_group($this->page->course) : NULL;
  43
  44         $groupmembers = "";
  45         $groupselect  = "";
  46         $rafrom       = "";
  47         $rawhere      = "";
  48         $params = array();
  49
  50         //Add this to the SQL to show only group users
  51         if ($currentgroup !== NULL) {
  52             $groupmembers = ", {groups_members} gm";
  53             $groupselect = "AND u.id = gm.userid AND gm.groupid = :currentgroup";
  54             $params['currentgroup'] = $currentgroup;
  55         }
  56
  57         $userfields = user_picture::fields('u', array('username'));
  58
  59         if ($this->page->course->id == SITEID) {  // Site-level
  60             $sql = "SELECT $userfields, MAX(u.lastaccess) AS lastaccess
  61                       FROM {user} u $groupmembers
  62                      WHERE u.lastaccess > $timefrom
  63                            $groupselect
  64                   GROUP BY $userfields
  65                   ORDER BY lastaccess DESC ";
  66
  67            $csql = "SELECT COUNT(u.id), u.id
  68                       FROM {user} u $groupmembers
  69                      WHERE u.lastaccess > $timefrom
  70                            $groupselect
  71                   GROUP BY u.id";
  72
  73         } else {
  74             // Course level - show only enrolled users for now
  75             // TODO: add a new capability for viewing of all users (guests+enrolled+viewing)
  76
  77             list($esqljoin, $eparams) = get_enrolled_sql($this->page->context);
  78             $params = array_merge($params, $eparams);
  79
  80             $sql = "SELECT $userfields, MAX(ul.timeaccess) AS lastaccess
  81                       FROM {user_lastaccess} ul, {user} u $groupmembers $rafrom
  82                       JOIN ($esqljoin) euj ON euj.id = u.id
  83                      WHERE ul.timeaccess > $timefrom
  84                            AND u.id = ul.userid
  85                            AND ul.courseid = :courseid
  86                            $groupselect $rawhere
  87                   GROUP BY $userfields
  88                   ORDER BY lastaccess DESC";
  89
  90            $csql = "SELECT u.id
  91                       FROM {user_lastaccess} ul, {user} u $groupmembers $rafrom
  92                       JOIN ($esqljoin) euj ON euj.id = u.id
  93                      WHERE ul.timeaccess > $timefrom
  94                            AND u.id = ul.userid
  95                            AND ul.courseid = :courseid
  96                            $groupselect $rawhere
  97                   GROUP BY u.id";
  98
  99             $params['courseid'] = $this->page->course->id;
 100         }
 101
 102         //Calculate minutes
 103         $minutes  = floor($timetoshowusers/60);
 104
 105         // Verify if we can see the list of users, if not just print number of users
 106         if (!has_capability('block/online_users:viewlist', $this->page->context)) {
 107             if (!$usercount = $DB->count_records_sql($csql, $params)) {
 108                 $usercount = get_string("none");
 109             }
 110             $this->content->text = "<div class=\"info\">".get_string("periodnminutes","block_online_users",$minutes).": $usercount</div>";
 111             return $this->content;
 112         }
 113
 114         if ($users = $DB->get_records_sql($sql, $params, 0, 50)) {   // We'll just take the most recent 50 maximum
 115             foreach ($users as $user) {
 116                 $users[$user->id]->fullname = fullname($user);
 117             }
 118         } else {
 119             $users = array();
 120         }
 121
 122         if (count($users) < 50) {
 123             $usercount = "";
 124         } else {
 125             $usercount = $DB->count_records_sql($csql, $params);
 126             $usercount = ": $usercount";
 127         }
 128
 129         $this->content->text = "<div class=\"info\">(".get_string("periodnminutes","block_online_users",$minutes)."$usercount)</div>";
 130
 131         //Now, we have in users, the list of users to show
 132         //Because they are online
 133         if (!empty($users)) {
 134             //Accessibility: Don't want 'Alt' text for the user picture; DO want it for the envelope/message link (existing lang string).
 135             //Accessibility: Converted <div> to <ul>, inherit existing classes & styles.
 136             $this->content->text .= "<ul class='list'>\n";
 137             if (isloggedin() && has_capability('moodle/site:sendmessage', $this->page->context)
 138                            && !empty($CFG->messaging) && !isguestuser()) {
 139                 $canshowicon = true;
 140             } else {
 141                 $canshowicon = false;
 142             }
 143             foreach ($users as $user) {
 144                 $this->content->text .= '<li class="listentry">';
 145                 $timeago = format_time(time() - $user->lastaccess); //bruno to calculate correctly on frontpage
 146
 147                 if (isguestuser($user)) {
 148                     $this->content->text .= '<div class="user">'.$OUTPUT->user_picture($user, array('size'=>16));
 149                     $this->content->text .= get_string('guestuser').'</div>';
 150
 151                 } else {
 152                     $this->content->text .= '<div class="user">'.$OUTPUT->user_picture($user, array('size'=>16));
 153                     $this->content->text .= '<a href="'.$CFG->wwwroot.'/user/view.php?id='.$user->id.'&amp;course='.$this->page->course->id.'" title="'.$timeago.'">'.$user->fullname.'</a></div>';
 154                 }
 155                 if ($canshowicon and ($USER->id != $user->id) and !isguestuser($user)) {  // Only when logged in and messaging active etc
 156                     $anchortagcontents = '<img class="iconsmall" src="'.$OUTPUT->pix_url('t/message') . '" alt="'. get_string('messageselectadd') .'" />';
 157                     $anchortag = '<a href="'.$CFG->wwwroot.'/message/index.php?id='.$user->id.'" title="'.get_string('messageselectadd').'">'.$anchortagcontents .'</a>';
 158
 159                     $this->content->text .= '<div class="message">'.$anchortag.'</div>';
 160                 }
 161                 $this->content->text .= "</li>\n";
 162             }
 163             $this->content->text .= '</ul><div class="clearer"><!-- --></div>';
 164         } else {
 165             $this->content->text .= "<div class=\"info\">".get_string("none")."</div>";
 166         }
 167
 168         return $this->content;
 169     }
 170 }
 171
 172