fbpost/fbpost.php

   1 <?php
   2 /**
   3  * Name: Facebook Post Connector
   4  * Version: 1.3
   5  * Author: Mike Macgirvin <http://macgirvin.com/profile/mike>
   6  * Author: Tobias Hößl <https://github.com/CatoTH/>
   7  *
   8  */
   9
  10 /**
  11  * Installing the Friendica/Facebook connector
  12  *
  13  * Detailed instructions how to use this plugin can be found at
  14  * https://github.com/friendica/friendica/wiki/How-to:-Friendica%E2%80%99s-Facebook-connector
  15  *
  16  * Vidoes and embeds will not be posted if there is no other content. Links
  17  * and images will be converted to a format suitable for the Facebook API and
  18  * long posts truncated - with a link to view the full post.
  19  *
  20  * Facebook contacts will not be able to view private photos, as they are not able to
  21  * authenticate to your site to establish identity. We will address this
  22  * in a future release.
  23  */
  24
  25
  26 require_once('include/security.php');
  27
  28 function fbpost_install() {
  29         register_hook('post_local',       'addon/fbpost/fbpost.php', 'fbpost_post_local');
  30         register_hook('notifier_normal',  'addon/fbpost/fbpost.php', 'fbpost_post_hook');
  31         register_hook('jot_networks',     'addon/fbpost/fbpost.php', 'fbpost_jot_nets');
  32         register_hook('connector_settings',  'addon/fbpost/fbpost.php', 'fbpost_plugin_settings');
  33         register_hook('enotify',          'addon/fbpost/fbpost.php', 'fbpost_enotify');
  34         register_hook('queue_predeliver', 'addon/fbpost/fbpost.php', 'fbpost_queue_hook');
  35 }
  36
  37
  38 function fbpost_uninstall() {
  39         unregister_hook('post_local',       'addon/fbpost/fbpost.php', 'fbpost_post_local');
  40         unregister_hook('notifier_normal',  'addon/fbpost/fbpost.php', 'fbpost_post_hook');
  41         unregister_hook('jot_networks',     'addon/fbpost/fbpost.php', 'fbpost_jot_nets');
  42         unregister_hook('connector_settings',  'addon/fbpost/fbpost.php', 'fbpost_plugin_settings');
  43         unregister_hook('enotify',          'addon/fbpost/fbpost.php', 'fbpost_enotify');
  44         unregister_hook('queue_predeliver', 'addon/fbpost/fbpost.php', 'fbpost_queue_hook');
  45
  46
  47 }
  48
  49
  50 /* declare the fbpost_module function so that /fbpost url requests will land here */
  51
  52 function fbpost_module() {}
  53
  54
  55
  56 // If a->argv[1] is a nickname, this is a callback from Facebook oauth requests.
  57 // If $_REQUEST["realtime_cb"] is set, this is a callback from the Real-Time Updates API
  58
  59 /**
  60  * @param App $a
  61  */
  62 function fbpost_init(&$a) {
  63
  64         if($a->argc != 2)
  65                 return;
  66
  67         $nick = $a->argv[1];
  68
  69         if(strlen($nick))
  70                 $r = q("SELECT `uid` FROM `user` WHERE `nickname` = '%s' LIMIT 1",
  71                                 dbesc($nick)
  72                 );
  73         if(!(isset($r) && count($r)))
  74                 return;
  75
  76         $uid           = $r[0]['uid'];
  77         $auth_code     = (x($_GET, 'code') ? $_GET['code'] : '');
  78         $error         = (x($_GET, 'error_description') ? $_GET['error_description'] : '');
  79
  80
  81         if($error)
  82                 logger('fbpost_init: Error: ' . $error);
  83
  84         if($auth_code && $uid) {
  85
  86                 $appid = get_config('facebook','appid');
  87                 $appsecret = get_config('facebook', 'appsecret');
  88
  89                 $x = fetch_url('https://graph.facebook.com/oauth/access_token?client_id='
  90                         . $appid . '&client_secret=' . $appsecret . '&redirect_uri='
  91                         . urlencode($a->get_baseurl() . '/fbpost/' . $nick)
  92                         . '&code=' . $auth_code);
  93
  94                 logger('fbpost_init: returned access token: ' . $x, LOGGER_DATA);
  95
  96                 if(strpos($x,'access_token=') !== false) {
  97                         $token = str_replace('access_token=', '', $x);
  98                         if(strpos($token,'&') !== false)
  99                                 $token = substr($token,0,strpos($token,'&'));
 100                         set_pconfig($uid,'facebook','access_token',$token);
 101                         set_pconfig($uid,'facebook','post','1');
 102                         fbpost_get_self($uid);
 103                 }
 104
 105         }
 106
 107 }
 108
 109
 110 /**
 111  * @param int $uid
 112  */
 113 function fbpost_get_self($uid) {
 114         $access_token = get_pconfig($uid,'facebook','access_token');
 115         if(! $access_token)
 116                 return;
 117         $s = fetch_url('https://graph.facebook.com/me/?access_token=' . $access_token);
 118         if($s) {
 119                 $j = json_decode($s);
 120                 set_pconfig($uid,'facebook','self_id',(string) $j->id);
 121         }
 122 }
 123
 124
 125 // This is the POST method to the facebook settings page
 126 // Content is posted to Facebook in the function facebook_post_hook()
 127
 128 /**
 129  * @param App $a
 130  */
 131 function fbpost_post(&$a) {
 132
 133         $uid = local_user();
 134         if($uid){
 135
 136
 137                 $fb_limited = get_config('facebook','crestrict');
 138
 139
 140                 $value = ((x($_POST,'post_by_default')) ? intval($_POST['post_by_default']) : 0);
 141                 set_pconfig($uid,'facebook','post_by_default', $value);
 142
 143
 144                 info( t('Settings updated.') . EOL);
 145         }
 146
 147         return;
 148 }
 149
 150 // Facebook settings form
 151
 152 /**
 153  * @param App $a
 154  * @return string
 155  */
 156 function fbpost_content(&$a) {
 157
 158         if(! local_user()) {
 159                 notice( t('Permission denied.') . EOL);
 160                 return '';
 161         }
 162
 163
 164         if(! service_class_allows(local_user(),'facebook_connect')) {
 165                 notice( t('Permission denied.') . EOL);
 166                 return upgrade_bool_message();
 167         }
 168
 169
 170         if($a->argc > 1 && $a->argv[1] === 'remove') {
 171                 del_pconfig(local_user(),'facebook','post');
 172                 info( t('Facebook Post disabled') . EOL);
 173         }
 174
 175         $o = '';
 176
 177         $fb_installed = false;
 178         if (get_pconfig(local_user(),'facebook','post')) {
 179                 $access_token = get_pconfig(local_user(),'facebook','access_token');
 180                 if ($access_token) {
 181                         $s = fetch_url('https://graph.facebook.com/me/feed?access_token=' . $access_token);
 182                         if($s) {
 183                                 $j = json_decode($s);
 184                                 if (isset($j->data)) $fb_installed = true;
 185                         }
 186                 }
 187         }
 188
 189         $appid = get_config('facebook','appid');
 190
 191         if(! $appid) {
 192                 notice( t('Facebook API key is missing.') . EOL);
 193                 return '';
 194         }
 195
 196         $a->page['htmlhead'] .= '<link rel="stylesheet" type="text/css" href="'
 197                 . $a->get_baseurl() . '/addon/fbpost/fbpost.css' . '" media="all" />' . "\r\n";
 198
 199         $o .= '<h3>' . t('Facebook Post') . '</h3>';
 200
 201         if(! $fb_installed) {
 202                 $o .= '<div id="fbpost-enable-wrapper">';
 203
 204                 $o .= '<a href="https://www.facebook.com/dialog/oauth?client_id=' . $appid . '&redirect_uri='
 205                         . $a->get_baseurl() . '/fbpost/' . $a->user['nickname'] . '&scope=publish_stream,offline_access">' . t('Install Facebook Post connector for this account.') . '</a>';
 206                 $o .= '</div>';
 207         }
 208
 209         if($fb_installed) {
 210                 $o .= '<div id="fbpost-disable-wrapper">';
 211
 212                 $o .= '<a href="' . $a->get_baseurl() . '/fbpost/remove' . '">' . t('Remove Facebook Post connector') . '</a></div>';
 213
 214                 $o .= '<div id="fbpost-enable-wrapper">';
 215
 216                 $o .= '<a href="https://www.facebook.com/dialog/oauth?client_id=' . $appid . '&redirect_uri='
 217                         . $a->get_baseurl() . '/fbpost/' . $a->user['nickname'] . '&scope=publish_stream,offline_access">' . t('Re-authenticate [This is necessary whenever your Facebook password is changed.]') . '</a>';
 218                 $o .= '</div>';
 219
 220                 $o .= '<div id="fbpost-post-default-form">';
 221                 $o .= '<form action="fbpost" method="post" >';
 222                 $post_by_default = get_pconfig(local_user(),'facebook','post_by_default');
 223                 $checked = (($post_by_default) ? ' checked="checked" ' : '');
 224                 $o .= '<input type="checkbox" name="post_by_default" value="1"' . $checked . '/>' . ' ' . t('Post to Facebook by default') . EOL;
 225
 226                 $o .= '<input type="submit" name="submit" value="' . t('Submit') . '" /></form></div>';
 227         }
 228
 229         return $o;
 230 }
 231
 232 /**
 233  * @param App $a
 234  * @param null|object $b
 235  */
 236 function fbpost_plugin_settings(&$a,&$b) {
 237
 238         $b .= '<div class="settings-block">';
 239         $b .= '<h3>' . t('Facebook') . '</h3>';
 240         $b .= '<a href="fbpost">' . t('Facebook Post Settings') . '</a><br />';
 241         $b .= '</div>';
 242
 243 }
 244
 245
 246 /**
 247  * @param App $a
 248  * @param null|object $o
 249  */
 250 function fbpost_plugin_admin(&$a, &$o){
 251
 252
 253         $o = '<input type="hidden" name="form_security_token" value="' . get_form_security_token("fbsave") . '">';
 254
 255         $o .= '<h4>' . t('Facebook API Key') . '</h4>';
 256
 257         $appid  = get_config('facebook', 'appid'  );
 258         $appsecret = get_config('facebook', 'appsecret' );
 259
 260         $ret1 = q("SELECT `v` FROM `config` WHERE `cat` = 'facebook' AND `k` = 'appid' LIMIT 1");
 261         $ret2 = q("SELECT `v` FROM `config` WHERE `cat` = 'facebook' AND `k` = 'appsecret' LIMIT 1");
 262         if ((count($ret1) > 0 && $ret1[0]['v'] != $appid) || (count($ret2) > 0 && $ret2[0]['v'] != $appsecret)) $o .= t('Error: it appears that you have specified the App-ID and -Secret in your .htconfig.php file. As long as they are specified there, they cannot be set using this form.<br><br>');
 263
 264         $o .= '<label for="fb_appid">' . t('App-ID / API-Key') . '</label><input id="fb_appid" name="appid" type="text" value="' . escape_tags($appid ? $appid : "") . '"><br style="clear: both;">';
 265         $o .= '<label for="fb_appsecret">' . t('Application secret') . '</label><input id="fb_appsecret" name="appsecret" type="text" value="' . escape_tags($appsecret ? $appsecret : "") . '"><br style="clear: both;">';
 266
 267         $o .= '<input type="submit" name="fb_save_keys" value="' . t('Save') . '">';
 268
 269 }
 270
 271 /**
 272  * @param App $a
 273  */
 274
 275 function fbpost_plugin_admin_post(&$a){
 276         check_form_security_token_redirectOnErr('/admin/plugins/fbpost', 'fbsave');
 277
 278         if (x($_REQUEST,'fb_save_keys')) {
 279                 set_config('facebook', 'appid', $_REQUEST['appid']);
 280                 set_config('facebook', 'appsecret', $_REQUEST['appsecret']);
 281
 282                 info(t('The new values have been saved.'));
 283         }
 284
 285 }
 286
 287 /**
 288  * @param App $a
 289  * @param object $b
 290  * @return mixed
 291  */
 292 function fbpost_jot_nets(&$a,&$b) {
 293         if(! local_user())
 294                 return;
 295
 296         $fb_post = get_pconfig(local_user(),'facebook','post');
 297         if(intval($fb_post) == 1) {
 298                 $fb_defpost = get_pconfig(local_user(),'facebook','post_by_default');
 299                 $selected = ((intval($fb_defpost) == 1) ? ' checked="checked" ' : '');
 300                 $b .= '<div class="profile-jot-net"><input type="checkbox" name="facebook_enable"' . $selected . ' value="1" /> '
 301                         . t('Post to Facebook') . '</div>';
 302         }
 303 }
 304
 305
 306 /**
 307  * @param App $a
 308  * @param object $b
 309  * @return mixed
 310  */
 311 function fbpost_post_hook(&$a,&$b) {
 312
 313
 314         if($b['deleted'] || ($b['created'] !== $b['edited']))
 315                 return;
 316
 317         /**
 318          * Post to Facebook stream
 319          */
 320
 321         require_once('include/group.php');
 322         require_once('include/html2plain.php');
 323
 324         logger('Facebook post');
 325
 326         $reply = false;
 327         $likes = false;
 328
 329         $deny_arr = array();
 330         $allow_arr = array();
 331
 332         $toplevel = (($b['id'] == $b['parent']) ? true : false);
 333
 334
 335         $linking = ((get_pconfig($b['uid'],'facebook','no_linking')) ? 0 : 1);
 336
 337         if((! $toplevel) && ($linking)) {
 338                 $r = q("SELECT * FROM `item` WHERE `id` = %d AND `uid` = %d LIMIT 1",
 339                         intval($b['parent']),
 340                         intval($b['uid'])
 341                 );
 342                 if(count($r) && substr($r[0]['uri'],0,4) === 'fb::')
 343                         $reply = substr($r[0]['uri'],4);
 344                 elseif(count($r) && substr($r[0]['extid'],0,4) === 'fb::')
 345                         $reply = substr($r[0]['extid'],4);
 346                 else
 347                         return;
 348
 349                 $u = q("SELECT * FROM user where uid = %d limit 1",
 350                         intval($b['uid'])
 351                 );
 352                 if(! count($u))
 353                         return;
 354
 355                 // only accept comments from the item owner. Other contacts are unknown to FB.
 356
 357                 if(! link_compare($b['author-link'], $a->get_baseurl() . '/profile/' . $u[0]['nickname']))
 358                         return;
 359
 360
 361                 logger('facebook reply id=' . $reply);
 362         }
 363
 364         if(strstr($b['postopts'],'facebook') || ($b['private']) || ($reply)) {
 365
 366                 if($b['private'] && $reply === false) {
 367                         $allow_people = expand_acl($b['allow_cid']);
 368                         $allow_groups = expand_groups(expand_acl($b['allow_gid']));
 369                         $deny_people  = expand_acl($b['deny_cid']);
 370                         $deny_groups  = expand_groups(expand_acl($b['deny_gid']));
 371
 372                         $recipients = array_unique(array_merge($allow_people,$allow_groups));
 373                         $deny = array_unique(array_merge($deny_people,$deny_groups));
 374
 375                         $allow_str = dbesc(implode(', ',$recipients));
 376                         if($allow_str) {
 377                                 $r = q("SELECT `notify` FROM `contact` WHERE `id` IN ( $allow_str ) AND `network` = 'face'");
 378                                 if(count($r))
 379                                         foreach($r as $rr)
 380                                                 $allow_arr[] = $rr['notify'];
 381                         }
 382
 383                         $deny_str = dbesc(implode(', ',$deny));
 384                         if($deny_str) {
 385                                 $r = q("SELECT `notify` FROM `contact` WHERE `id` IN ( $deny_str ) AND `network` = 'face'");
 386                                 if(count($r))
 387                                         foreach($r as $rr)
 388                                                 $deny_arr[] = $rr['notify'];
 389                         }
 390
 391                         if(count($deny_arr) && (! count($allow_arr))) {
 392
 393                                 // One or more FB folks were denied access but nobody on FB was specifically allowed access.
 394                                 // This might cause the post to be open to public on Facebook, but only to selected members
 395                                 // on another network. Since this could potentially leak a post to somebody who was denied,
 396                                 // we will skip posting it to Facebook with a slightly vague but relevant message that will
 397                                 // hopefully lead somebody to this code comment for a better explanation of what went wrong.
 398
 399                                 notice( t('Post to Facebook cancelled because of multi-network access permission conflict.') . EOL);
 400                                 return;
 401                         }
 402
 403
 404                         // if it's a private message but no Facebook members are allowed or denied, skip Facebook post
 405
 406                         if((! count($allow_arr)) && (! count($deny_arr)))
 407                                 return;
 408                 }
 409
 410                 if($b['verb'] == ACTIVITY_LIKE)
 411                         $likes = true;
 412
 413
 414                 $appid  = get_config('facebook', 'appid'  );
 415                 $secret = get_config('facebook', 'appsecret' );
 416
 417                 if($appid && $secret) {
 418
 419                         logger('facebook: have appid+secret');
 420
 421                         $fb_token  = get_pconfig($b['uid'],'facebook','access_token');
 422
 423
 424                         // post to facebook if it's a public post and we've ticked the 'post to Facebook' box,
 425                         // or it's a private message with facebook participants
 426                         // or it's a reply or likes action to an existing facebook post
 427
 428                         if($fb_token && ($toplevel || $b['private'] || $reply)) {
 429                                 logger('facebook: able to post');
 430                                 require_once('library/facebook.php');
 431                                 require_once('include/bbcode.php');
 432
 433                                 $msg = $b['body'];
 434
 435                                 logger('Facebook post: original msg=' . $msg, LOGGER_DATA);
 436
 437                                 // make links readable before we strip the code
 438
 439                                 // unless it's a dislike - just send the text as a comment
 440
 441                                 // if($b['verb'] == ACTIVITY_DISLIKE)
 442                                 //      $msg = trim(strip_tags(bbcode($msg)));
 443
 444                                 // Old code
 445                                 /*$search_str = $a->get_baseurl() . '/search';
 446
 447                                 if(preg_match("/\[url=(.*?)\](.*?)\[\/url\]/is",$msg,$matches)) {
 448
 449                                         // don't use hashtags for message link
 450
 451                                         if(strpos($matches[2],$search_str) === false) {
 452                                                 $link = $matches[1];
 453                                                 if(substr($matches[2],0,5) != '[img]')
 454                                                         $linkname = $matches[2];
 455                                         }
 456                                 }
 457
 458                                 // strip tag links to avoid link clutter, this really should be
 459                                 // configurable because we're losing information
 460
 461                                 $msg = preg_replace("/\#\[url=(.*?)\](.*?)\[\/url\]/is",'#$2',$msg);
 462
 463                                 // provide the link separately for normal links
 464                                 $msg = preg_replace("/\[url=(.*?)\](.*?)\[\/url\]/is",'$2 $1',$msg);
 465
 466                                 if(preg_match("/\[img\](.*?)\[\/img\]/is",$msg,$matches))
 467                                         $image = $matches[1];
 468
 469                                 $msg = preg_replace("/\[img\](.*?)\[\/img\]/is", t('Image: ') . '$1', $msg);
 470
 471                                 if((strpos($link,z_root()) !== false) && (! $image))
 472                                         $image = $a->get_baseurl() . '/images/friendica-64.jpg';
 473
 474                                 $msg = trim(strip_tags(bbcode($msg)));*/
 475
 476                                 // New code
 477
 478                                 // Looking for the first image
 479                                 $image = '';
 480                                 if(preg_match("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/is",$b['body'],$matches))
 481                                         $image = $matches[3];
 482
 483                                 if ($image == '')
 484                                         if(preg_match("/\[img\](.*?)\[\/img\]/is",$b['body'],$matches))
 485                                                 $image = $matches[1];
 486
 487                                 // When saved into the database the content is sent through htmlspecialchars
 488                                 // That means that we have to decode all image-urls
 489                                 $image = htmlspecialchars_decode($image);
 490
 491                                 // Checking for a bookmark element
 492                                 $body = $b['body'];
 493                                 if (strpos($body, "[bookmark") !== false) {
 494                                         // splitting the text in two parts:
 495                                         // before and after the bookmark
 496                                         $pos = strpos($body, "[bookmark");
 497                                         $body1 = substr($body, 0, $pos);
 498                                         $body2 = substr($body, $pos);
 499
 500                                         // Removing the bookmark and all quotes after the bookmark
 501                                         // they are mostly only the content after the bookmark.
 502                                         $body2 = preg_replace("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism",'',$body2);
 503                                         $body2 = preg_replace("/\[quote\=([^\]]*)\](.*?)\[\/quote\]/ism",'',$body2);
 504                                         $body2 = preg_replace("/\[quote\](.*?)\[\/quote\]/ism",'',$body2);
 505
 506                                         $body = $body1.$body2;
 507                                 }
 508
 509                                 // At first convert the text to html
 510                                 $html = bbcode($body, false, false);
 511
 512                                 // Then convert it to plain text
 513                                 $msg = trim($b['title']." \n\n".html2plain($html, 0, true));
 514                                 $msg = html_entity_decode($msg,ENT_QUOTES,'UTF-8');
 515
 516                                 // Removing multiple newlines
 517                                 while (strpos($msg, "\n\n\n") !== false)
 518                                         $msg = str_replace("\n\n\n", "\n\n", $msg);
 519
 520                                 // add any attachments as text urls
 521                                 $arr = explode(',',$b['attach']);
 522
 523                                 if(count($arr)) {
 524                                         $msg .= "\n";
 525                                         foreach($arr as $r) {
 526                                                 $matches = false;
 527                                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" size=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"\[\/attach\]|',$r,$matches);
 528                                                 if($cnt) {
 529                                                         $msg .= "\n".$matches[1];
 530                                                 }
 531                                         }
 532                                 }
 533
 534                                 $link = '';
 535                                 $linkname = '';
 536                                 // look for bookmark-bbcode and handle it with priority
 537                                 if(preg_match("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/is",$b['body'],$matches)) {
 538                                         $link = $matches[1];
 539                                         $linkname = $matches[2];
 540                                 }
 541
 542                                 // If there is no bookmark element then take the first link
 543                                 if ($link == '') {
 544                                         $links = collecturls($html);
 545                                         if (sizeof($links) > 0) {
 546                                                 reset($links);
 547                                                 $link = current($links);
 548                                         }
 549                                 }
 550
 551                                 // Remove trailing and leading spaces
 552                                 $msg = trim($msg);
 553
 554
 555                                 // Fallback - if message is empty
 556                                 if(!strlen($msg))
 557                                         $msg = $linkname;
 558
 559                                 if(!strlen($msg))
 560                                         $msg = $link;
 561
 562                                 if(!strlen($msg))
 563                                         $msg = $image;
 564
 565                                 // If there is nothing to post then exit
 566                                 if(!strlen($msg))
 567                                         return;
 568
 569                                 logger('Facebook post: msg=' . $msg, LOGGER_DATA);
 570
 571                                 if($likes) {
 572                                         $postvars = array('access_token' => $fb_token);
 573                                 }
 574                                 else {
 575                                         // message, picture, link, name, caption, description, source, place, tags
 576                                         $postvars = array(
 577                                                 'access_token' => $fb_token,
 578                                                 'message' => $msg
 579                                         );
 580                                         if(trim($image) != "") {
 581                                                 $postvars['picture'] = $image;
 582                                         }
 583                                         if(trim($link) != "") {
 584                                                 $postvars['link'] = $link;
 585
 586                                                 // The following doesn't work - why?
 587                                                 if ((stristr($link,'youtube')) || (stristr($link,'youtu.be')) || (stristr($link,'vimeo'))) {
 588                                                         $postvars['source'] = $link;
 589                                                 }
 590                                         }
 591                                         if(trim($linkname) != "")
 592                                                 $postvars['name'] = $linkname;
 593                                 }
 594
 595                                 if(($b['private']) && ($toplevel)) {
 596                                         $postvars['privacy'] = '{"value": "CUSTOM", "friends": "SOME_FRIENDS"';
 597                                         if(count($allow_arr))
 598                                                 $postvars['privacy'] .= ',"allow": "' . implode(',',$allow_arr) . '"';
 599                                         if(count($deny_arr))
 600                                                 $postvars['privacy'] .= ',"deny": "' . implode(',',$deny_arr) . '"';
 601                                         $postvars['privacy'] .= '}';
 602
 603                                 }
 604
 605                                 if($reply) {
 606                                         $url = 'https://graph.facebook.com/' . $reply . '/' . (($likes) ? 'likes' : 'comments');
 607                                 } else if (($link != "")  or ($image != "") or ($b['title'] == '') or (strlen($msg) < 500)) {
 608                                         $url = 'https://graph.facebook.com/me/feed';
 609                                         if($b['plink'])
 610                                                 $postvars['actions'] = '{"name": "' . t('View on Friendica') . '", "link": "' .  $b['plink'] . '"}';
 611                                 } else {
 612                                         // if its only a message and a subject and the message is larger than 500 characters then post it as note
 613                                         $postvars = array(
 614                                                 'access_token' => $fb_token,
 615                                                 'message' => bbcode($b['body'], false, false),
 616                                                 'subject' => $b['title'],
 617                                         );
 618                                         $url = 'https://graph.facebook.com/me/notes';
 619                                 }
 620
 621                                 logger('facebook: post to ' . $url);
 622                                 logger('facebook: postvars: ' . print_r($postvars,true));
 623
 624                                 // "test_mode" prevents anything from actually being posted.
 625                                 // Otherwise, let's do it.
 626
 627                                 if(! get_config('facebook','test_mode')) {
 628                                         $x = post_url($url, $postvars);
 629                                         logger('Facebook post returns: ' . $x, LOGGER_DEBUG);
 630
 631                                         $retj = json_decode($x);
 632                                         if($retj->id) {
 633                                                 q("UPDATE `item` SET `extid` = '%s' WHERE `id` = %d LIMIT 1",
 634                                                         dbesc('fb::' . $retj->id),
 635                                                         intval($b['id'])
 636                                                 );
 637                                         }
 638                                         else {
 639                                                 if(! $likes) {
 640                                                         $s = serialize(array('url' => $url, 'item' => $b['id'], 'post' => $postvars));
 641                                                         require_once('include/queue_fn.php');
 642                                                         add_to_queue($a->contact,NETWORK_FACEBOOK,$s);
 643                                                         notice( t('Facebook post failed. Queued for retry.') . EOL);
 644                                                 }
 645
 646                                                 if (isset($retj->error) && $retj->error->type == "OAuthException" && $retj->error->code == 190) {
 647                                                         logger('Facebook session has expired due to changed password.', LOGGER_DEBUG);
 648
 649                                                         $last_notification = get_pconfig($b['uid'], 'facebook', 'session_expired_mailsent');
 650                                                         if (!$last_notification || $last_notification < (time() - FACEBOOK_SESSION_ERR_NOTIFICATION_INTERVAL)) {
 651                                                                 require_once('include/enotify.php');
 652
 653                                                                 $r = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($b['uid']) );
 654                                                                 notification(array(
 655                                                                         'uid' => $b['uid'],
 656                                                                         'type' => NOTIFY_SYSTEM,
 657                                                                         'system_type' => 'facebook_connection_invalid',
 658                                                                         'language'     => $r[0]['language'],
 659                                                                         'to_name'      => $r[0]['username'],
 660                                                                         'to_email'     => $r[0]['email'],
 661                                                                         'source_name'  => t('Administrator'),
 662                                                                         'source_link'  => $a->config["system"]["url"],
 663                                                                         'source_photo' => $a->config["system"]["url"] . '/images/person-80.jpg',
 664                                                                 ));
 665
 666                                                                 set_pconfig($b['uid'], 'facebook', 'session_expired_mailsent', time());
 667                                                         } else logger('Facebook: No notification, as the last one was sent on ' . $last_notification, LOGGER_DEBUG);
 668                                                 }
 669                                         }
 670                                 }
 671                         }
 672                 }
 673         }
 674 }
 675
 676 /**
 677  * @param App $app
 678  * @param object $data
 679  */
 680 function fbpost_enotify(&$app, &$data) {
 681         if (x($data, 'params') && $data['params']['type'] == NOTIFY_SYSTEM && x($data['params'], 'system_type') && $data['params']['system_type'] == 'facebook_connection_invalid') {
 682                 $data['itemlink'] = '/facebook';
 683                 $data['epreamble'] = $data['preamble'] = t('Your Facebook connection became invalid. Please Re-authenticate.');
 684                 $data['subject'] = t('Facebook connection became invalid');
 685                 $data['body'] = sprintf( t("Hi %1\$s,\n\nThe connection between your accounts on %2\$s and Facebook became invalid. This usually happens after you change your Facebook-password. To enable the connection again, you have to %3\$sre-authenticate the Facebook-connector%4\$s."), $data['params']['to_name'], "[url=" . $app->config["system"]["url"] . "]" . $app->config["sitename"] . "[/url]", "[url=" . $app->config["system"]["url"] . "/facebook]", "[/url]");
 686         }
 687 }
 688
 689 /**
 690  * @param App $a
 691  * @param object $b
 692  */
 693 function fbpost_post_local(&$a,&$b) {
 694
 695         // Figure out if Facebook posting is enabled for this post and file it in 'postopts'
 696         // where we will discover it during background delivery.
 697
 698         // This can only be triggered by a local user posting to their own wall.
 699
 700         if((local_user()) && (local_user() == $b['uid'])) {
 701
 702                 $fb_post   = intval(get_pconfig(local_user(),'facebook','post'));
 703                 $fb_enable = (($fb_post && x($_REQUEST,'facebook_enable')) ? intval($_REQUEST['facebook_enable']) : 0);
 704
 705                 // if API is used, default to the chosen settings
 706                 // but allow a specific override
 707
 708                 if($_REQUEST['api_source'] && intval(get_pconfig(local_user(),'facebook','post_by_default'))) {
 709                         if(! x($_REQUEST,'facebook_enable'))
 710                                 $fb_enable = 1;
 711                 }
 712
 713                 if(! $fb_enable)
 714                         return;
 715
 716                 if(strlen($b['postopts']))
 717                         $b['postopts'] .= ',';
 718                 $b['postopts'] .= 'facebook';
 719         }
 720 }
 721
 722
 723 /**
 724  * @param App $a
 725  * @param object $b
 726  */
 727 function fbpost_queue_hook(&$a,&$b) {
 728
 729         $qi = q("SELECT * FROM `queue` WHERE `network` = '%s'",
 730                 dbesc(NETWORK_FACEBOOK)
 731         );
 732         if(! count($qi))
 733                 return;
 734
 735         require_once('include/queue_fn.php');
 736
 737         foreach($qi as $x) {
 738                 if($x['network'] !== NETWORK_FACEBOOK)
 739                         continue;
 740
 741                 logger('facebook_queue: run');
 742
 743                 $r = q("SELECT `user`.* FROM `user` LEFT JOIN `contact` on `contact`.`uid` = `user`.`uid`
 744                         WHERE `contact`.`self` = 1 AND `contact`.`id` = %d LIMIT 1",
 745                         intval($x['cid'])
 746                 );
 747                 if(! count($r))
 748                         continue;
 749
 750                 $user = $r[0];
 751
 752                 $appid  = get_config('facebook', 'appid'  );
 753                 $secret = get_config('facebook', 'appsecret' );
 754
 755                 if($appid && $secret) {
 756                         $fb_post   = intval(get_pconfig($user['uid'],'facebook','post'));
 757                         $fb_token  = get_pconfig($user['uid'],'facebook','access_token');
 758
 759                         if($fb_post && $fb_token) {
 760                                 logger('facebook_queue: able to post');
 761                                 require_once('library/facebook.php');
 762
 763                                 $z = unserialize($x['content']);
 764                                 $item = $z['item'];
 765                                 $j = post_url($z['url'],$z['post']);
 766
 767                                 $retj = json_decode($j);
 768                                 if($retj->id) {
 769                                         q("UPDATE `item` SET `extid` = '%s' WHERE `id` = %d LIMIT 1",
 770                                                 dbesc('fb::' . $retj->id),
 771                                                 intval($item)
 772                                         );
 773                                         logger('facebook_queue: success: ' . $j);
 774                                         remove_queue_item($x['id']);
 775                                 }
 776                                 else {
 777                                         logger('facebook_queue: failed: ' . $j);
 778                                         update_queue_time($x['id']);
 779                                 }
 780                         }
 781                 }
 782         }
 783 }
 784
 785
 786 /**
 787  * @return bool|string
 788  */
 789 function fbpost_get_app_access_token() {
 790
 791         $acc_token = get_config('facebook','app_access_token');
 792
 793         if ($acc_token !== false) return $acc_token;
 794
 795         $appid = get_config('facebook','appid');
 796         $appsecret = get_config('facebook', 'appsecret');
 797
 798         if ($appid === false || $appsecret === false) {
 799                 logger('fb_get_app_access_token: appid and/or appsecret not set', LOGGER_DEBUG);
 800                 return false;
 801         }
 802         logger('https://graph.facebook.com/oauth/access_token?client_id=' . $appid . '&client_secret=' . $appsecret . '&grant_type=client_credentials', LOGGER_DATA);
 803         $x = fetch_url('https://graph.facebook.com/oauth/access_token?client_id=' . $appid . '&client_secret=' . $appsecret . '&grant_type=client_credentials');
 804
 805         if(strpos($x,'access_token=') !== false) {
 806                 logger('fb_get_app_access_token: returned access token: ' . $x, LOGGER_DATA);
 807
 808                 $token = str_replace('access_token=', '', $x);
 809                 if(strpos($token,'&') !== false)
 810                         $token = substr($token,0,strpos($token,'&'));
 811
 812                 if ($token == "") {
 813                         logger('fb_get_app_access_token: empty token: ' . $x, LOGGER_DEBUG);
 814                         return false;
 815                 }
 816                 set_config('facebook','app_access_token',$token);
 817                 return $token;
 818         } else {
 819                 logger('fb_get_app_access_token: response did not contain an access_token: ' . $x, LOGGER_DATA);
 820                 return false;
 821         }
 822 }
 823