mod/forum/subscribe.php

   1 <?php // $Id$
   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, $course->id)) {
  21         if (groupmode($course, $cm) and !isteacheredit($course->id)) {   // Make sure user is allowed
  22             if (! mygroupid($course->id)) {
  23                 error("Sorry, but you must be a group member to subscribe.");
  24             }
  25         }
  26     } else {
  27         $cm->id = 0;
  28     }
  29
  30     if ($user) {
  31         if (!isteacher($course->id)) {
  32             error("Only teachers can subscribe/unsubscribe other people!");
  33         }
  34         if (! $user = get_record("user", "id", $user)) {
  35             error("User ID was incorrect");
  36         }
  37     } else {
  38         $user = $USER;
  39     }
  40
  41     require_login($course->id, false, $cm);
  42
  43     if (isguest()) {   // Guests can't subscribe
  44         $wwwroot = $CFG->wwwroot.'/login/index.php';
  45         if (!empty($CFG->loginhttps)) {
  46             $wwwroot = str_replace('http:','https:', $wwwroot);
  47         }
  48
  49         $strforums = get_string('modulenameplural', 'forum');
  50         if ($course->category) {
  51             print_header($course->shortname, $course->fullname,
  52                  "<a href=\"../../course/view.php?id=$course->id\">$course->shortname</a> ->
  53                   <a href=\"../forum/index.php?id=$course->id\">$strforums</a> ->
  54                   <a href=\"view.php?f=$forum->id\">".format_string($forum->name,true)."</a>", '', '', true, "", navmenu($course, $cm));
  55         } else {
  56             print_header($course->shortname, $course->fullname,
  57                  "<a href=\"../forum/index.php?id=$course->id\">$strforums</a> ->
  58                   <a href=\"view.php?f=$forum->id\">".format_string($forum->name,true)."</a>", '', '', true, "", navmenu($course, $cm));
  59         }
  60         notice_yesno(get_string('noguestsubscribe', 'forum').'<br /><br />'.get_string('liketologin'),
  61                      $wwwroot, $_SERVER['HTTP_REFERER']);
  62         print_footer($course);
  63         exit;
  64     }
  65
  66     if ($forum->type == "teacher") {
  67         if (!isteacher($course->id)) {
  68             error("You must be a $course->teacher to subscribe to this forum");
  69         }
  70     }
  71
  72     $returnto = forum_go_back_to("index.php?id=$course->id");
  73
  74     if ($force and isteacher($course->id)) {
  75         if (forum_is_forcesubscribed($forum->id)) {
  76             forum_forcesubscribe($forum->id, 0);
  77             redirect($returnto, get_string("everyonecanchoose", "forum"), 1);
  78         } else {
  79             forum_forcesubscribe($forum->id, 1);
  80             redirect($returnto, get_string("everyoneissubscribed", "forum"), 1);
  81         }
  82     }
  83
  84     if (forum_is_forcesubscribed($forum->id)) {
  85         redirect($returnto, get_string("everyoneissubscribed", "forum"), 1);
  86     }
  87
  88     $info->name  = fullname($user);
  89     $info->forum = format_string($forum->name);
  90
  91     if ( forum_is_subscribed($user->id, $forum->id) ) {
  92         if (forum_unsubscribe($user->id, $forum->id) ) {
  93             add_to_log($course->id, "forum", "unsubscribe", "view.php?f=$forum->id", $forum->id, $cm->id);
  94             redirect($returnto, get_string("nownotsubscribed", "forum", $info), 1);
  95         } else {
  96             error("Could not unsubscribe you from that forum", $_SERVER["HTTP_REFERER"]);
  97         }
  98
  99     } else { // subscribe
 100         if ($forum->forcesubscribe == FORUM_DISALLOWSUBSCRIBE && !isteacher($forum->course)) {
 101             error(get_string('disallowsubscribe'),$_SERVER["HTTP_REFERER"]);
 102         }
 103         if (forum_subscribe($user->id, $forum->id) ) {
 104             add_to_log($course->id, "forum", "subscribe", "view.php?f=$forum->id", $forum->id, $cm->id);
 105             redirect($returnto, get_string("nowsubscribed", "forum", $info), 1);
 106         } else {
 107             error("Could not subscribe you to that forum", $_SERVER["HTTP_REFERER"]);
 108         }
 109     }
 110
 111 ?>