addon/facebook/facebook.php

   1 <?php
   2
   3 /**
   4  * This module needs a lot of work.
   5  *
   6  * - setting/storing preferences
   7  * - documentation on how to obtain FB API keys for your site
   8  * - ensuring a valid FB login session
   9  * - requesting permissions within the FB login session to post on your behalf until permission revoked.
  10  *
  11  */
  12
  13 define('FACEBOOK_MAXPOSTLEN', 420);
  14
  15 /* declare the facebook_module function so that /facebook url requests will land here */
  16
  17 function facebook_module() {}
  18
  19
  20
  21 /* Callback from Facebook oauth requests. */
  22
  23 function facebook_init(&$a) {
  24
  25         if($a->argc != 2)
  26                 return;
  27         $nick = $a->argv[1];
  28         if(strlen($nick))
  29                 $r = q("SELECT `uid` FROM `user` WHERE `nickname` = '%s' LIMIT 1",
  30                                 dbesc($nick)
  31                 );
  32         if(! count($r))
  33                 return;
  34
  35         $uid           = $r[0]['uid'];
  36         $auth_code     = (($_GET['code']) ? $_GET['code'] : '');
  37         $error         = (($_GET['error_description']) ? $_GET['error_description'] : '');
  38
  39
  40         if($auth_code && $uid) {
  41
  42                 $appid = get_config('facebook','appid');
  43                 $appsecret = get_config('facebook', 'appsecret');
  44
  45                 $x = fetch_url('https://graph.facebook.com/oauth/access_token?client_id='
  46                         . $appid . '&client_secret=' . $appsecret . '&redirect_uri='
  47                         . urlencode($a->get_baseurl() . '/facebook/' . $nick)
  48                         . '&code=' . $auth_code);
  49                 if(strpos($x,'access_token=') !== false) {
  50                         $token = str_replace('access_token=', '', $x);
  51                         if(strpos($token,'&') !== false)
  52                                 $token = substr('$token,0,strpos($token,'&'));
  53                         set_pconfig($uid,'facebook','access_token',$token);
  54                 }
  55
  56                 // todo: is this a browser session or a server session? where do we go?
  57         }
  58
  59 }
  60
  61 function facebook_content(&$a) {
  62         $o = "facebook module loaded";
  63         return $o;
  64 }
  65
  66 function facebook_install() {
  67         register_hook('post_local_end', 'addon/facebook/facebook.php', 'facebook_post_hook');
  68 }
  69
  70
  71 function facebook_uninstall() {
  72         unregister_hook('post_local_end', 'addon/facebook/facebook.php', 'facebook_post_hook');
  73 }
  74
  75
  76 function facebook_post_hook(&$a,&$b) {
  77
  78         /**
  79          * Post to Facebook stream
  80          */
  81
  82         if((local_user()) && (local_user() == $b['uid']) && (! $b['private']) && (! $b['parent'])) {
  83
  84                 $appid  = get_config('facebook', 'appid'  );
  85                 $secret = get_config('facebook', 'appsecret' );
  86
  87                 if($appid && $secret) {
  88
  89                         $fb_post  = get_pconfig(local_user(),'facebook','post');
  90                         $fb_token = get_pconfig(local_user(),'facebook','access_token');
  91
  92                         if($fb_post && $fb_token) {
  93                                 require_once('library/facebook.php');
  94                                 require_once('include/bbcode.php');
  95
  96
  97                                 // make links readable before we strip the code
  98
  99                                 $msg = preg_replace('\[url\=(.?*)\](.?*)\[\/url\]/is','$2 ($1)',$msg);
 100
 101                                 $msg = preg_replace('\[img\](.?*)\[\/img\]/is', t('Image: ') . '$1',$msg);
 102
 103                                 $msg = trim(strip_tags(bbcode($b['body'])));
 104                                 if (strlen($msg) > FACEBOOK_MAXPOSTLEN) {
 105                                         $shortlink = "";
 106                                         require_once('addon/twitter/slinky.php');
 107
 108                                         $display_url = $a->get_baseurl() . '/display/' . $a->user['nickname'] . '/' . $b['id'];
 109                                         $slinky = new Slinky( $posturl );
 110                                         // setup a cascade of shortening services
 111                                         // try to get a short link from these services
 112                                         // in the order ur1.ca, trim, id.gd, tinyurl
 113                                         $slinky->set_cascade( array( new Slinky_UR1ca(), new Slinky_Trim(), new Slinky_IsGd(), new Slinky_TinyURL() ) );
 114                                         $shortlink = $slinky->short();
 115                                         // the new message will be shortened such that "... $shortlink"
 116                                         // will fit into the character limit
 117                                         $msg = substr($msg, 0, FACEBOOK_MAXPOSTLEN - strlen($shortlink) - 4);
 118                                         $msg .= '... ' . $shortlink;
 119                                 }
 120                                 if(! strlen($msg))
 121                                         return;
 122
 123
 124
 125
 126                                 $facebook = new Facebook(array(
 127                                         'appId'  => $appid,
 128                                         'secret' => $secret,
 129                                         'cookie' => true
 130                                 ));
 131                                 try {
 132                                         $statusUpdate = $facebook->api('/me/feed', 'post', array('message'=> bbcode($b['body']), 'cb' => ''));
 133                                 }
 134                                 catch (FacebookApiException $e) {
 135                                         notice( t('Facebook status update failed.') . EOL);
 136                                 }
 137                         }
 138                 }
 139         }
 140 }
 141