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   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Online users block.
  19   *
  20   * @package    block_online_users
  21   * @copyright  1999 onwards Martin Dougiamas (http://dougiamas.com)
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  use block_online_users\fetcher;
  26  
  27  /**
  28   * This block needs to be reworked.
  29   * The new roles system does away with the concepts of rigid student and
  30   * teacher roles.
  31   */
  32  class block_online_users extends block_base {
  33      function init() {
  34          $this->title = get_string('pluginname','block_online_users');
  35      }
  36  
  37      function has_config() {
  38          return true;
  39      }
  40  
  41      function get_content() {
  42          global $USER, $CFG, $DB, $OUTPUT, $PAGE;
  43  
  44          if ($this->content !== NULL) {
  45              return $this->content;
  46          }
  47  
  48          $this->content = new stdClass;
  49          $this->content->text = '';
  50          $this->content->footer = '';
  51  
  52          if (empty($this->instance)) {
  53              return $this->content;
  54          }
  55  
  56          $timetoshowusers = 300; //Seconds default
  57          if (isset($CFG->block_online_users_timetosee)) {
  58              $timetoshowusers = $CFG->block_online_users_timetosee * 60;
  59          }
  60          $now = time();
  61  
  62          //Calculate if we are in separate groups
  63          $isseparategroups = ($this->page->course->groupmode == SEPARATEGROUPS
  64                               && $this->page->course->groupmodeforce
  65                               && !has_capability('moodle/site:accessallgroups', $this->page->context));
  66  
  67          //Get the user current group
  68          $currentgroup = $isseparategroups ? groups_get_course_group($this->page->course) : NULL;
  69  
  70          $sitelevel = $this->page->course->id == SITEID || $this->page->context->contextlevel < CONTEXT_COURSE;
  71  
  72          $onlineusers = new fetcher($currentgroup, $now, $timetoshowusers, $this->page->context,
  73                  $sitelevel, $this->page->course->id);
  74  
  75          //Calculate minutes
  76          $minutes  = floor($timetoshowusers/60);
  77  
  78          // Verify if we can see the list of users, if not just print number of users
  79          if (!has_capability('block/online_users:viewlist', $this->page->context)) {
  80              if (!$usercount = $onlineusers->count_users()) {
  81                  $usercount = get_string("none");
  82              }
  83              $this->content->text = "<div class=\"info\">".get_string("periodnminutes","block_online_users",$minutes).": $usercount</div>";
  84              return $this->content;
  85          }
  86          $userlimit = 50; // We'll just take the most recent 50 maximum.
  87          if ($users = $onlineusers->get_users($userlimit)) {
  88              foreach ($users as $user) {
  89                  $users[$user->id]->fullname = fullname($user);
  90              }
  91          } else {
  92              $users = array();
  93          }
  94  
  95          $usercount = $onlineusers->count_users();
  96          $usercount = ": $usercount";
  97  
  98          $this->content->text = "<div class=\"info\">(".get_string("periodnminutes","block_online_users",$minutes)."$usercount)</div>";
  99  
 100          //Now, we have in users, the list of users to show
 101          //Because they are online
 102          if (!empty($users)) {
 103              //Accessibility: Don't want 'Alt' text for the user picture; DO want it for the envelope/message link (existing lang string).
 104              //Accessibility: Converted <div> to <ul>, inherit existing classes & styles.
 105              $this->content->text .= "<ul class='list'>\n";
 106              if (isloggedin() && has_capability('moodle/site:sendmessage', $this->page->context)
 107                             && !empty($CFG->messaging) && !isguestuser()) {
 108                  $canshowicon = true;
 109                  message_messenger_requirejs();
 110              } else {
 111                  $canshowicon = false;
 112              }
 113              foreach ($users as $user) {
 114                  $this->content->text .= '<li class="listentry">';
 115                  $timeago = format_time($now - $user->lastaccess); //bruno to calculate correctly on frontpage
 116  
 117                  if (isguestuser($user)) {
 118                      $this->content->text .= '<div class="user">'.$OUTPUT->user_picture($user, array('size'=>16, 'alttext'=>false));
 119                      $this->content->text .= get_string('guestuser').'</div>';
 120  
 121                  } else {
 122                      $this->content->text .= '<div class="user">';
 123                      $this->content->text .= '<a href="'.$CFG->wwwroot.'/user/view.php?id='.$user->id.'&amp;course='.$this->page->course->id.'" title="'.$timeago.'">';
 124                      $this->content->text .= $OUTPUT->user_picture($user, array('size'=>16, 'alttext'=>false, 'link'=>false)) .$user->fullname.'</a></div>';
 125                  }
 126                  if ($canshowicon and ($USER->id != $user->id) and !isguestuser($user)) {  // Only when logged in and messaging active etc
 127                      $anchortagcontents = '<img class="iconsmall" src="'.$OUTPUT->pix_url('t/message') . '" alt="'. get_string('messageselectadd') .'" />';
 128                      $anchorurl = new moodle_url('/message/index.php', array('id' => $user->id));
 129                      $anchortag = html_writer::link($anchorurl, $anchortagcontents, array_merge(
 130                        message_messenger_sendmessage_link_params($user),
 131                        array('title' => get_string('messageselectadd'))
 132                      ));
 133  
 134                      $this->content->text .= '<div class="message">'.$anchortag.'</div>';
 135                  }
 136                  $this->content->text .= "</li>\n";
 137              }
 138              $this->content->text .= '</ul><div class="clearer"><!-- --></div>';
 139          } else {
 140              $this->content->text .= "<div class=\"info\">".get_string("none")."</div>";
 141          }
 142  
 143          return $this->content;
 144      }
 145  }
 146  
 147