communityinvite/lib.php

   1 <?php
   2
   3     /*
   4      *  Community invite plugin
   5      *  Allows people to invite their mutual friends to communities
   6      */
   7
   8      // Set up menu items etc
   9         function communityinvite_pagesetup() {
  10
  11             // register links --
  12             global $profile_id;
  13             global $PAGE;
  14             global $CFG;
  15             global $USER;
  16             global $metatags;
  17
  18             $page_owner = $profile_id;
  19             $usertype = user_type($page_owner);
  20             $username= user_info('username', $page_owner);
  21
  22             if ($usertype == "community") {
  23
  24                 if (defined("context") && context == "profile") {
  25
  26                     if (run("permissions:check", "profile")) {
  27
  28                         // Add submenu link
  29                         $PAGE->menu_sub[] = array( 'name' => 'community:edit',
  30                                                    'html' => a_href("{$CFG->wwwroot}mod/communityinvite/index.php?profile_id=$page_owner" ,
  31                                                                      __gettext("Invite friends to community")));
  32                     }
  33
  34                 }
  35
  36             }
  37         }
  38
  39      // Get IDs of community members as a string
  40         function communityinvite_notin($userid) {
  41             global $CFG;
  42             $notin = "-1";
  43             if ($friends = get_records_sql("select ident from {$CFG->friends} where friend = {$userid}")) {
  44                 foreach($friends as $friend) {
  45                     $notin .= "," . $friend->ident;
  46                 }
  47             }
  48             return $notin;
  49         }
  50
  51      // Get usernames of mutual friends
  52         function communityinvite_mutualfriends($userid = -2, $notin = "-1") {
  53             global $CFG, $messages;
  54             if ($userid == -2) {
  55                 $userid = $_SESSION['userid'];
  56             }
  57             if ($notin == "-1") {
  58                 $notin = communityinvite_notin($userid);
  59             }
  60             if ($userid > 0) {
  61                 $mutualfriends = get_records_sql("select * from {$CFG->prefix}users where ident not in ({$notin}) and ident in (select owner as ident from {$CFG->prefix}friends where friend = {$userid} and owner in (select friend as owner from {$CFG->prefix}friends where owner = {$userid}))");
  62                 return $mutualfriends;
  63
  64             }
  65             return false;
  66         }
  67
  68      // Check actions
  69         function communityinvite_actions() {
  70             global $CFG, $messages, $page_owner;
  71
  72             $action = optional_param("action");
  73             if (isloggedin() && run("permissions:check", "profile") && !empty($action)) {
  74
  75                 switch($action) {
  76
  77                     case "community:friends:invite":
  78                                                         $people = optional_param("people");
  79                                                         if (!empty($people)) {
  80                                                             communityinvite_doinvite($page_owner, $people);
  81                                                         } else {
  82                                                             $messages[] = __gettext("Sorry - we couldn't find anyone to invite.");
  83                                                         }
  84                                                         $_SESSION['messages'] = $messages;
  85                                                         header("Location: {$CFG->wwwroot}mod/communityinvite/index.php?profile_id={$page_owner}");
  86                                                         exit;
  87                                                         break;
  88
  89                 }
  90
  91             }
  92
  93         }
  94
  95      // Inviter function
  96         function communityinvite_doinvite($community, $people) {
  97             global $CFG,$messages;
  98             if (isloggedin()) {
  99
 100                 if ($mutualfriends = communityinvite_mutualfriends($_SESSION['userid'])) {
 101
 102                     $emailarray = array();
 103                     foreach($mutualfriends as $mutual) {
 104                         $emailarray[trim(strtolower($mutual->username))] = $mutual->ident;
 105                     }
 106
 107                     $communityrow = get_record_sql("select * from {$CFG->prefix}users where ident = {$community}");
 108                     $peoplearray = explode(",",$people);
 109
 110                     $title = sprintf(__gettext("%s has invited you to join a community"),$_SESSION['name']);
 111                     $message = sprintf(__gettext("%s has invited you to join the following community: %s. To do so, visit the following profile:\n\n\t%s\n\nYou can join the community from this screen."),$_SESSION['name'],$communityrow->name,$CFG->wwwroot . $communityrow->username);
 112
 113                     if (!empty($peoplearray)) {
 114                         foreach($peoplearray as $person) {
 115                             $person = trim(strtolower($person));
 116                             if (!empty($emailarray[$person])) {
 117                                 notify_user($emailarray[$person], $title, $message);
 118                             }
 119                         }
 120                         $messages[] = sprintf(__gettext("Your friends were invited to join the %s community."),$communityrow->name);
 121                     }
 122
 123                 }
 124
 125             }
 126         }
 127
 128 ?>