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   1  <?php // $Id: subscribe.php,v 1.37.2.7 2008/04/13 19:10:35 skodak Exp $
   2  
   3  //  Subscribe to or unsubscribe from a forum.
   4  
   5      require_once("../../config.php");
   6      require_once ("lib.php");
   7  
   8      $id = required_param('id',PARAM_INT);      // The forum to subscribe or unsubscribe to
   9      $force = optional_param('force','',PARAM_ALPHA);  // Force everyone to be subscribed to this forum?
  10      $user = optional_param('user',0,PARAM_INT);
  11  
  12      if (! $forum = get_record("forum", "id", $id)) {
  13          error("Forum ID was incorrect");
  14      }
  15  
  16      if (! $course = get_record("course", "id", $forum->course)) {
  17          error("Forum doesn't belong to a course!");
  18      }
  19  
  20      if ($cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {
  21          $context = get_context_instance(CONTEXT_MODULE, $cm->id);
  22      } else {
  23          $cm->id = 0;
  24          $context = get_context_instance(CONTEXT_MODULE, $cm->id);
  25      }
  26  
  27      if ($user) {
  28          if (!has_capability('mod/forum:managesubscriptions', $context)) {
  29              error('You do not have the permission to subscribe/unsubscribe other people!');
  30          }
  31          if (!$user = get_record("user", "id", $user)) {
  32              error("User ID was incorrect");
  33          }
  34      } else {
  35          $user = $USER;
  36      }
  37  
  38      if (groupmode($course, $cm)
  39                  and !forum_is_subscribed($user->id, $forum)
  40                  and !has_capability('moodle/site:accessallgroups', $context)) {
  41          if (!mygroupid($course->id)) {
  42              error('Sorry, but you must be a group member to subscribe.');
  43          }
  44      }
  45  
  46      require_login($course->id, false, $cm);
  47  
  48      if (isguest()) {   // Guests can't subscribe
  49          $wwwroot = $CFG->wwwroot.'/login/index.php';
  50          if (!empty($CFG->loginhttps)) {
  51              $wwwroot = str_replace('http:','https:', $wwwroot);
  52          }
  53          
  54          $navigation = build_navigation('', $cm);
  55          print_header($course->shortname, $course->fullname, $navigation, '', '', true, "", navmenu($course, $cm));
  56          
  57          notice_yesno(get_string('noguestsubscribe', 'forum').'<br /><br />'.get_string('liketologin'),
  58                       $wwwroot, $_SERVER['HTTP_REFERER']);
  59          print_footer($course);
  60          exit;
  61      }
  62  
  63      $returnto = optional_param('backtoindex',0,PARAM_INT) 
  64          ? "index.php?id=".$course->id 
  65          : "view.php?f=$id";
  66  
  67      if ($force and has_capability('mod/forum:managesubscriptions', $context)) {
  68          if (forum_is_forcesubscribed($forum)) {
  69              forum_forcesubscribe($forum->id, 0);
  70              redirect($returnto, get_string("everyonecannowchoose", "forum"), 1);
  71          } else {
  72              forum_forcesubscribe($forum->id, 1);
  73              redirect($returnto, get_string("everyoneisnowsubscribed", "forum"), 1);
  74          }
  75      }
  76  
  77      if (forum_is_forcesubscribed($forum)) {
  78          redirect($returnto, get_string("everyoneisnowsubscribed", "forum"), 1);
  79      }
  80  
  81      $info->name  = fullname($user);
  82      $info->forum = format_string($forum->name);
  83  
  84      if (forum_is_subscribed($user->id, $forum->id)) {
  85          if (forum_unsubscribe($user->id, $forum->id)) {
  86              add_to_log($course->id, "forum", "unsubscribe", "view.php?f=$forum->id", $forum->id, $cm->id);
  87              redirect($returnto, get_string("nownotsubscribed", "forum", $info), 1);
  88          } else {
  89              error("Could not unsubscribe you from that forum", $_SERVER["HTTP_REFERER"]);
  90          }
  91  
  92      } else {  // subscribe
  93          if ($forum->forcesubscribe == FORUM_DISALLOWSUBSCRIBE &&
  94                      !has_capability('mod/forum:managesubscriptions', $context)) {
  95              print_error('disallowsubscribe', 'forum', $_SERVER["HTTP_REFERER"]);
  96          }
  97          if (!has_capability('mod/forum:viewdiscussion', $context)) {
  98              error("Could not subscribe you to that forum", $_SERVER["HTTP_REFERER"]);
  99          }
 100          if (forum_subscribe($user->id, $forum->id) ) {
 101              add_to_log($course->id, "forum", "subscribe", "view.php?f=$forum->id", $forum->id, $cm->id);
 102              redirect($returnto, get_string("nowsubscribed", "forum", $info), 1);
 103          } else {
 104              error("Could not subscribe you to that forum", $_SERVER["HTTP_REFERER"]);
 105          }
 106      }
 107  
 108  ?>