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                 $value = ((x($_POST,'suppress_view_on_friendica')) ? intval($_POST['suppress_view_on_friendica']) : 0);
 144                 set_pconfig($uid,'facebook','suppress_view_on_friendica', $value);
 145
 146                 $value = ((x($_POST,'post_to_page')) ? $_POST['post_to_page'] : "0-0");
 147                 $values = explode("-", $value);
 148                 set_pconfig($uid,'facebook','post_to_page', $values[0]);
 149                 set_pconfig($uid,'facebook','page_access_token', $values[1]);
 150
 151                 info( t('Settings updated.') . EOL);
 152         }
 153
 154         return;
 155 }
 156
 157 // Facebook settings form
 158
 159 /**
 160  * @param App $a
 161  * @return string
 162  */
 163 function fbpost_content(&$a) {
 164
 165         if(! local_user()) {
 166                 notice( t('Permission denied.') . EOL);
 167                 return '';
 168         }
 169
 170
 171         if(! service_class_allows(local_user(),'facebook_connect')) {
 172                 notice( t('Permission denied.') . EOL);
 173                 return upgrade_bool_message();
 174         }
 175
 176
 177         if($a->argc > 1 && $a->argv[1] === 'remove') {
 178                 del_pconfig(local_user(),'facebook','post');
 179                 info( t('Facebook Post disabled') . EOL);
 180         }
 181
 182         $o = '';
 183
 184         $fb_installed = false;
 185         if (get_pconfig(local_user(),'facebook','post')) {
 186                 $access_token = get_pconfig(local_user(),'facebook','access_token');
 187                 if ($access_token) {
 188                         $s = fetch_url('https://graph.facebook.com/me/feed?access_token=' . $access_token);
 189                         if($s) {
 190                                 $j = json_decode($s);
 191                                 if (isset($j->data)) $fb_installed = true;
 192                         }
 193                 }
 194         }
 195
 196         $appid = get_config('facebook','appid');
 197
 198         if(! $appid) {
 199                 notice( t('Facebook API key is missing.') . EOL);
 200                 return '';
 201         }
 202
 203         $a->page['htmlhead'] .= '<link rel="stylesheet" type="text/css" href="'
 204                 . $a->get_baseurl() . '/addon/fbpost/fbpost.css' . '" media="all" />' . "\r\n";
 205
 206         $o .= '<h3>' . t('Facebook Post') . '</h3>';
 207
 208         if(! $fb_installed) {
 209                 $o .= '<div id="fbpost-enable-wrapper">';
 210
 211                 $o .= '<a href="https://www.facebook.com/dialog/oauth?client_id=' . $appid . '&redirect_uri='
 212                         . $a->get_baseurl() . '/fbpost/' . $a->user['nickname'] . '&scope=publish_stream,manage_pages,offline_access">' . t('Install Facebook Post connector for this account.') . '</a>';
 213                 $o .= '</div>';
 214         }
 215
 216         if($fb_installed) {
 217                 $o .= '<div id="fbpost-disable-wrapper">';
 218
 219                 $o .= '<a href="' . $a->get_baseurl() . '/fbpost/remove' . '">' . t('Remove Facebook Post connector') . '</a></div>';
 220
 221                 $o .= '<div id="fbpost-enable-wrapper">';
 222
 223                 $o .= '<a href="https://www.facebook.com/dialog/oauth?client_id=' . $appid . '&redirect_uri='
 224                         . $a->get_baseurl() . '/fbpost/' . $a->user['nickname'] . '&scope=publish_stream,manage_pages,offline_access">' . t('Re-authenticate [This is necessary whenever your Facebook password is changed.]') . '</a>';
 225                 $o .= '</div>';
 226
 227                 $o .= '<div id="fbpost-post-default-form">';
 228                 $o .= '<form action="fbpost" method="post" >';
 229                 $post_by_default = get_pconfig(local_user(),'facebook','post_by_default');
 230                 $checked = (($post_by_default) ? ' checked="checked" ' : '');
 231                 $o .= '<input type="checkbox" name="post_by_default" value="1"' . $checked . '/>' . ' ' . t('Post to Facebook by default') . EOL;
 232
 233                 $suppress_view_on_friendica = get_pconfig(local_user(),'facebook','suppress_view_on_friendica');
 234                 $checked = (($suppress_view_on_friendica) ? ' checked="checked" ' : '');
 235                 $o .= '<input type="checkbox" name="suppress_view_on_friendica" value="1"' . $checked . '/>' . ' ' . t('Suppress "View on friendica"') . EOL;
 236
 237                 // List all pages
 238                 $post_to_page = get_pconfig(local_user(),'facebook','post_to_page');
 239                 $page_access_token = get_pconfig(local_user(),'facebook','page_access_token');
 240                 $fb_token  = get_pconfig($a->user['uid'],'facebook','access_token');
 241                 $url = 'https://graph.facebook.com/me/accounts';
 242                 $x = file_get_contents($url."?access_token=".$fb_token);
 243                 $accounts = json_decode($x);
 244
 245                 $o .= t("Post to page:")."<select name='post_to_page'>";
 246                 if (intval($post_to_page) == 0)
 247                         $o .= "<option value='0-0' selected>".t('None')."</option>";
 248                 else
 249                         $o .= "<option value='0-0'>".t('None')."</option>";
 250
 251                 foreach($accounts->data as $account) {
 252                         if (is_array($account->perms))
 253                                 if ($post_to_page == $account->id)
 254                                         $o .= "<option value='".$account->id."-".$account->access_token."' selected>".$account->name."</option>";
 255                                 else
 256                                         $o .= "<option value='".$account->id."-".$account->access_token."'>".$account->name."</option>";
 257                 }
 258                 $o .= "</select>";
 259
 260                 $o .= '<p><input type="submit" name="submit" value="' . t('Submit') . '" /></form></div>';
 261
 262         }
 263
 264         return $o;
 265 }
 266
 267 /**
 268  * @param App $a
 269  * @param null|object $b
 270  */
 271 function fbpost_plugin_settings(&$a,&$b) {
 272
 273         $b .= '<div class="settings-block">';
 274         $b .= '<h3>' . t('Facebook') . '</h3>';
 275         $b .= '<a href="fbpost">' . t('Facebook Post Settings') . '</a><br />';
 276         $b .= '</div>';
 277
 278 }
 279
 280
 281 /**
 282  * @param App $a
 283  * @param null|object $o
 284  */
 285 function fbpost_plugin_admin(&$a, &$o){
 286
 287
 288         $o = '<input type="hidden" name="form_security_token" value="' . get_form_security_token("fbsave") . '">';
 289
 290         $o .= '<h4>' . t('Facebook API Key') . '</h4>';
 291
 292         $appid  = get_config('facebook', 'appid'  );
 293         $appsecret = get_config('facebook', 'appsecret' );
 294
 295         $ret1 = q("SELECT `v` FROM `config` WHERE `cat` = 'facebook' AND `k` = 'appid' LIMIT 1");
 296         $ret2 = q("SELECT `v` FROM `config` WHERE `cat` = 'facebook' AND `k` = 'appsecret' LIMIT 1");
 297         if ((count($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>');
 298
 299         $o .= '<label for="fb_appid">' . t('App-ID / API-Key') . '</label><input id="fb_appid" name="appid" type="text" value="' . escape_tags($appid ? $appid : "") . '"><br style="clear: both;">';
 300         $o .= '<label for="fb_appsecret">' . t('Application secret') . '</label><input id="fb_appsecret" name="appsecret" type="text" value="' . escape_tags($appsecret ? $appsecret : "") . '"><br style="clear: both;">';
 301
 302         $o .= '<input type="submit" name="fb_save_keys" value="' . t('Save') . '">';
 303
 304 }
 305
 306 /**
 307  * @param App $a
 308  */
 309
 310 function fbpost_plugin_admin_post(&$a){
 311         check_form_security_token_redirectOnErr('/admin/plugins/fbpost', 'fbsave');
 312
 313         if (x($_REQUEST,'fb_save_keys')) {
 314                 set_config('facebook', 'appid', $_REQUEST['appid']);
 315                 set_config('facebook', 'appsecret', $_REQUEST['appsecret']);
 316
 317                 info(t('The new values have been saved.'));
 318         }
 319
 320 }
 321
 322 /**
 323  * @param App $a
 324  * @param object $b
 325  * @return mixed
 326  */
 327 function fbpost_jot_nets(&$a,&$b) {
 328         if(! local_user())
 329                 return;
 330
 331         $fb_post = get_pconfig(local_user(),'facebook','post');
 332         if(intval($fb_post) == 1) {
 333                 $fb_defpost = get_pconfig(local_user(),'facebook','post_by_default');
 334                 $selected = ((intval($fb_defpost) == 1) ? ' checked="checked" ' : '');
 335                 $b .= '<div class="profile-jot-net"><input type="checkbox" name="facebook_enable"' . $selected . ' value="1" /> '
 336                         . t('Post to Facebook') . '</div>';
 337         }
 338 }
 339
 340
 341 /**
 342  * @param App $a
 343  * @param object $b
 344  * @return mixed
 345  */
 346 function fbpost_post_hook(&$a,&$b) {
 347
 348
 349         if($b['deleted'] || ($b['created'] !== $b['edited']))
 350                 return;
 351
 352         /**
 353          * Post to Facebook stream
 354          */
 355
 356         require_once('include/group.php');
 357         require_once('include/html2plain.php');
 358
 359         logger('Facebook post');
 360
 361         $reply = false;
 362         $likes = false;
 363
 364         $deny_arr = array();
 365         $allow_arr = array();
 366
 367         $toplevel = (($b['id'] == $b['parent']) ? true : false);
 368
 369
 370         $linking = ((get_pconfig($b['uid'],'facebook','no_linking')) ? 0 : 1);
 371
 372         if((! $toplevel) && ($linking)) {
 373                 $r = q("SELECT * FROM `item` WHERE `id` = %d AND `uid` = %d LIMIT 1",
 374                         intval($b['parent']),
 375                         intval($b['uid'])
 376                 );
 377                 if(count($r) && substr($r[0]['uri'],0,4) === 'fb::')
 378                         $reply = substr($r[0]['uri'],4);
 379                 elseif(count($r) && substr($r[0]['extid'],0,4) === 'fb::')
 380                         $reply = substr($r[0]['extid'],4);
 381                 else
 382                         return;
 383
 384                 $u = q("SELECT * FROM user where uid = %d limit 1",
 385                         intval($b['uid'])
 386                 );
 387                 if(! count($u))
 388                         return;
 389
 390                 // only accept comments from the item owner. Other contacts are unknown to FB.
 391
 392                 if(! link_compare($b['author-link'], $a->get_baseurl() . '/profile/' . $u[0]['nickname']))
 393                         return;
 394
 395
 396                 logger('facebook reply id=' . $reply);
 397         }
 398
 399         if(strstr($b['postopts'],'facebook') || ($b['private']) || ($reply)) {
 400
 401                 if($b['private'] && $reply === false) {
 402                         $allow_people = expand_acl($b['allow_cid']);
 403                         $allow_groups = expand_groups(expand_acl($b['allow_gid']));
 404                         $deny_people  = expand_acl($b['deny_cid']);
 405                         $deny_groups  = expand_groups(expand_acl($b['deny_gid']));
 406
 407                         $recipients = array_unique(array_merge($allow_people,$allow_groups));
 408                         $deny = array_unique(array_merge($deny_people,$deny_groups));
 409
 410                         $allow_str = dbesc(implode(', ',$recipients));
 411                         if($allow_str) {
 412                                 $r = q("SELECT `notify` FROM `contact` WHERE `id` IN ( $allow_str ) AND `network` = 'face'");
 413                                 if(count($r))
 414                                         foreach($r as $rr)
 415                                                 $allow_arr[] = $rr['notify'];
 416                         }
 417
 418                         $deny_str = dbesc(implode(', ',$deny));
 419                         if($deny_str) {
 420                                 $r = q("SELECT `notify` FROM `contact` WHERE `id` IN ( $deny_str ) AND `network` = 'face'");
 421                                 if(count($r))
 422                                         foreach($r as $rr)
 423                                                 $deny_arr[] = $rr['notify'];
 424                         }
 425
 426                         if(count($deny_arr) && (! count($allow_arr))) {
 427
 428                                 // One or more FB folks were denied access but nobody on FB was specifically allowed access.
 429                                 // This might cause the post to be open to public on Facebook, but only to selected members
 430                                 // on another network. Since this could potentially leak a post to somebody who was denied,
 431                                 // we will skip posting it to Facebook with a slightly vague but relevant message that will
 432                                 // hopefully lead somebody to this code comment for a better explanation of what went wrong.
 433
 434                                 notice( t('Post to Facebook cancelled because of multi-network access permission conflict.') . EOL);
 435                                 return;
 436                         }
 437
 438
 439                         // if it's a private message but no Facebook members are allowed or denied, skip Facebook post
 440
 441                         if((! count($allow_arr)) && (! count($deny_arr)))
 442                                 return;
 443                 }
 444
 445                 if($b['verb'] == ACTIVITY_LIKE)
 446                         $likes = true;
 447
 448
 449                 $appid  = get_config('facebook', 'appid'  );
 450                 $secret = get_config('facebook', 'appsecret' );
 451
 452                 if($appid && $secret) {
 453
 454                         logger('facebook: have appid+secret');
 455
 456                         $fb_token  = get_pconfig($b['uid'],'facebook','access_token');
 457
 458
 459                         // post to facebook if it's a public post and we've ticked the 'post to Facebook' box,
 460                         // or it's a private message with facebook participants
 461                         // or it's a reply or likes action to an existing facebook post
 462
 463                         if($fb_token && ($toplevel || $b['private'] || $reply)) {
 464                                 logger('facebook: able to post');
 465                                 require_once('library/facebook.php');
 466                                 require_once('include/bbcode.php');
 467
 468                                 $msg = $b['body'];
 469
 470                                 logger('Facebook post: original msg=' . $msg, LOGGER_DATA);
 471
 472                                 // make links readable before we strip the code
 473
 474                                 // unless it's a dislike - just send the text as a comment
 475
 476                                 // if($b['verb'] == ACTIVITY_DISLIKE)
 477                                 //      $msg = trim(strip_tags(bbcode($msg)));
 478
 479                                 // Old code
 480                                 /*$search_str = $a->get_baseurl() . '/search';
 481
 482                                 if(preg_match("/\[url=(.*?)\](.*?)\[\/url\]/is",$msg,$matches)) {
 483
 484                                         // don't use hashtags for message link
 485
 486                                         if(strpos($matches[2],$search_str) === false) {
 487                                                 $link = $matches[1];
 488                                                 if(substr($matches[2],0,5) != '[img]')
 489                                                         $linkname = $matches[2];
 490                                         }
 491                                 }
 492
 493                                 // strip tag links to avoid link clutter, this really should be
 494                                 // configurable because we're losing information
 495
 496                                 $msg = preg_replace("/\#\[url=(.*?)\](.*?)\[\/url\]/is",'#$2',$msg);
 497
 498                                 // provide the link separately for normal links
 499                                 $msg = preg_replace("/\[url=(.*?)\](.*?)\[\/url\]/is",'$2 $1',$msg);
 500
 501                                 if(preg_match("/\[img\](.*?)\[\/img\]/is",$msg,$matches))
 502                                         $image = $matches[1];
 503
 504                                 $msg = preg_replace("/\[img\](.*?)\[\/img\]/is", t('Image: ') . '$1', $msg);
 505
 506                                 if((strpos($link,z_root()) !== false) && (! $image))
 507                                         $image = $a->get_baseurl() . '/images/friendica-64.jpg';
 508
 509                                 $msg = trim(strip_tags(bbcode($msg)));*/
 510
 511                                 // New code
 512
 513                                 // Looking for the first image
 514                                 $image = '';
 515                                 if(preg_match("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/is",$b['body'],$matches))
 516                                         $image = $matches[3];
 517
 518                                 if ($image == '')
 519                                         if(preg_match("/\[img\](.*?)\[\/img\]/is",$b['body'],$matches))
 520                                                 $image = $matches[1];
 521
 522                                 // When saved into the database the content is sent through htmlspecialchars
 523                                 // That means that we have to decode all image-urls
 524                                 $image = htmlspecialchars_decode($image);
 525
 526                                 // Checking for a bookmark element
 527                                 $body = $b['body'];
 528                                 if (strpos($body, "[bookmark") !== false) {
 529                                         // splitting the text in two parts:
 530                                         // before and after the bookmark
 531                                         $pos = strpos($body, "[bookmark");
 532                                         $body1 = substr($body, 0, $pos);
 533                                         $body2 = substr($body, $pos);
 534
 535                                         // Removing the bookmark and all quotes after the bookmark
 536                                         // they are mostly only the content after the bookmark.
 537                                         $body2 = preg_replace("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism",'',$body2);
 538                                         $body2 = preg_replace("/\[quote\=([^\]]*)\](.*?)\[\/quote\]/ism",'',$body2);
 539                                         $body2 = preg_replace("/\[quote\](.*?)\[\/quote\]/ism",'',$body2);
 540
 541                                         $body = $body1.$body2;
 542                                 }
 543
 544                                 // At first convert the text to html
 545                                 $html = bbcode($body, false, false);
 546
 547                                 // Then convert it to plain text
 548                                 $msg = trim($b['title']." \n\n".html2plain($html, 0, true));
 549                                 $msg = html_entity_decode($msg,ENT_QUOTES,'UTF-8');
 550
 551                                 // Removing multiple newlines
 552                                 while (strpos($msg, "\n\n\n") !== false)
 553                                         $msg = str_replace("\n\n\n", "\n\n", $msg);
 554
 555                                 // add any attachments as text urls
 556                                 $arr = explode(',',$b['attach']);
 557
 558                                 if(count($arr)) {
 559                                         $msg .= "\n";
 560                                         foreach($arr as $r) {
 561                                                 $matches = false;
 562                                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" size=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"\[\/attach\]|',$r,$matches);
 563                                                 if($cnt) {
 564                                                         $msg .= "\n".$matches[1];
 565                                                 }
 566                                         }
 567                                 }
 568
 569                                 $link = '';
 570                                 $linkname = '';
 571                                 // look for bookmark-bbcode and handle it with priority
 572                                 if(preg_match("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/is",$b['body'],$matches)) {
 573                                         $link = $matches[1];
 574                                         $linkname = $matches[2];
 575                                 }
 576
 577                                 // If there is no bookmark element then take the first link
 578                                 if ($link == '') {
 579                                         $links = collecturls($html);
 580                                         if (sizeof($links) > 0) {
 581                                                 reset($links);
 582                                                 $link = current($links);
 583                                         }
 584                                 }
 585
 586                                 // Remove trailing and leading spaces
 587                                 $msg = trim($msg);
 588
 589
 590                                 // Fallback - if message is empty
 591                                 if(!strlen($msg))
 592                                         $msg = $linkname;
 593
 594                                 if(!strlen($msg))
 595                                         $msg = $link;
 596
 597                                 if(!strlen($msg))
 598                                         $msg = $image;
 599
 600                                 // If there is nothing to post then exit
 601                                 if(!strlen($msg))
 602                                         return;
 603
 604                                 logger('Facebook post: msg=' . $msg, LOGGER_DATA);
 605
 606                                 if($likes) {
 607                                         $postvars = array('access_token' => $fb_token);
 608                                 }
 609                                 else {
 610                                         // message, picture, link, name, caption, description, source, place, tags
 611                                         $postvars = array(
 612                                                 'access_token' => $fb_token,
 613                                                 'message' => $msg
 614                                         );
 615                                         if(trim($image) != "") {
 616                                                 $postvars['picture'] = $image;
 617                                         }
 618                                         if(trim($link) != "") {
 619                                                 $postvars['link'] = $link;
 620
 621                                                 // The following doesn't work - why?
 622                                                 if ((stristr($link,'youtube')) || (stristr($link,'youtu.be')) || (stristr($link,'vimeo'))) {
 623                                                         $postvars['source'] = $link;
 624                                                 }
 625                                         }
 626                                         if(trim($linkname) != "")
 627                                                 $postvars['name'] = $linkname;
 628                                 }
 629
 630                                 if(($b['private']) && ($toplevel)) {
 631                                         $postvars['privacy'] = '{"value": "CUSTOM", "friends": "SOME_FRIENDS"';
 632                                         if(count($allow_arr))
 633                                                 $postvars['privacy'] .= ',"allow": "' . implode(',',$allow_arr) . '"';
 634                                         if(count($deny_arr))
 635                                                 $postvars['privacy'] .= ',"deny": "' . implode(',',$deny_arr) . '"';
 636                                         $postvars['privacy'] .= '}';
 637
 638                                 }
 639
 640                                 $post_to_page = get_pconfig($b['uid'],'facebook','post_to_page');
 641                                 $page_access_token = get_pconfig($b['uid'],'facebook','page_access_token');
 642                                 if ((intval($post_to_page) != 0) and ($page_access_token != ""))
 643                                         $target = $post_to_page;
 644                                 else
 645                                         $target = "me";
 646
 647                                 if($reply) {
 648                                         $url = 'https://graph.facebook.com/' . $reply . '/' . (($likes) ? 'likes' : 'comments');
 649                                 } else if (($link != "") or ($image != "") or ($b['title'] == '') or (strlen($msg) < 500) or ($target != "me")) {
 650                                         $url = 'https://graph.facebook.com/'.$target.'/feed';
 651                                         if (!get_pconfig($b['uid'],'facebook','suppress_view_on_friendica') and $b['plink'])
 652                                                 $postvars['actions'] = '{"name": "' . t('View on Friendica') . '", "link": "' .  $b['plink'] . '"}';
 653                                 } else {
 654                                         // if its only a message and a subject and the message is larger than 500 characters then post it as note
 655                                         $postvars = array(
 656                                                 'access_token' => $fb_token,
 657                                                 'message' => bbcode($b['body'], false, false),
 658                                                 'subject' => $b['title'],
 659                                         );
 660                                         $url = 'https://graph.facebook.com/me/notes';
 661                                 }
 662
 663                                 // Post to page?
 664                                 if (!$reply and $target != "me")
 665                                         $postvars['access_token'] = $page_access_token;
 666
 667                                 logger('facebook: post to ' . $url);
 668                                 logger('facebook: postvars: ' . print_r($postvars,true));
 669
 670                                 // "test_mode" prevents anything from actually being posted.
 671                                 // Otherwise, let's do it.
 672
 673                                 if(! get_config('facebook','test_mode')) {
 674                                         $x = post_url($url, $postvars);
 675                                         logger('Facebook post returns: ' . $x, LOGGER_DEBUG);
 676
 677                                         $retj = json_decode($x);
 678                                         if($retj->id) {
 679                                                 q("UPDATE `item` SET `extid` = '%s' WHERE `id` = %d LIMIT 1",
 680                                                         dbesc('fb::' . $retj->id),
 681                                                         intval($b['id'])
 682                                                 );
 683                                         }
 684                                         else {
 685                                                 if(! $likes) {
 686                                                         $s = serialize(array('url' => $url, 'item' => $b['id'], 'post' => $postvars));
 687                                                         require_once('include/queue_fn.php');
 688                                                         add_to_queue($a->contact,NETWORK_FACEBOOK,$s);
 689                                                         notice( t('Facebook post failed. Queued for retry.') . EOL);
 690                                                 }
 691
 692                                                 if (isset($retj->error) && $retj->error->type == "OAuthException" && $retj->error->code == 190) {
 693                                                         logger('Facebook session has expired due to changed password.', LOGGER_DEBUG);
 694
 695                                                         $last_notification = get_pconfig($b['uid'], 'facebook', 'session_expired_mailsent');
 696                                                         if (!$last_notification || $last_notification < (time() - FACEBOOK_SESSION_ERR_NOTIFICATION_INTERVAL)) {
 697                                                                 require_once('include/enotify.php');
 698
 699                                                                 $r = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($b['uid']) );
 700                                                                 notification(array(
 701                                                                         'uid' => $b['uid'],
 702                                                                         'type' => NOTIFY_SYSTEM,
 703                                                                         'system_type' => 'facebook_connection_invalid',
 704                                                                         'language'     => $r[0]['language'],
 705                                                                         'to_name'      => $r[0]['username'],
 706                                                                         'to_email'     => $r[0]['email'],
 707                                                                         'source_name'  => t('Administrator'),
 708                                                                         'source_link'  => $a->config["system"]["url"],
 709                                                                         'source_photo' => $a->config["system"]["url"] . '/images/person-80.jpg',
 710                                                                 ));
 711
 712                                                                 set_pconfig($b['uid'], 'facebook', 'session_expired_mailsent', time());
 713                                                         } else logger('Facebook: No notification, as the last one was sent on ' . $last_notification, LOGGER_DEBUG);
 714                                                 }
 715                                         }
 716                                 }
 717                         }
 718                 }
 719         }
 720 }
 721
 722 /**
 723  * @param App $app
 724  * @param object $data
 725  */
 726 function fbpost_enotify(&$app, &$data) {
 727         if (x($data, 'params') && $data['params']['type'] == NOTIFY_SYSTEM && x($data['params'], 'system_type') && $data['params']['system_type'] == 'facebook_connection_invalid') {
 728                 $data['itemlink'] = '/facebook';
 729                 $data['epreamble'] = $data['preamble'] = t('Your Facebook connection became invalid. Please Re-authenticate.');
 730                 $data['subject'] = t('Facebook connection became invalid');
 731                 $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]");
 732         }
 733 }
 734
 735 /**
 736  * @param App $a
 737  * @param object $b
 738  */
 739 function fbpost_post_local(&$a,&$b) {
 740
 741         // Figure out if Facebook posting is enabled for this post and file it in 'postopts'
 742         // where we will discover it during background delivery.
 743
 744         // This can only be triggered by a local user posting to their own wall.
 745
 746         if((local_user()) && (local_user() == $b['uid'])) {
 747
 748                 $fb_post   = intval(get_pconfig(local_user(),'facebook','post'));
 749                 $fb_enable = (($fb_post && x($_REQUEST,'facebook_enable')) ? intval($_REQUEST['facebook_enable']) : 0);
 750
 751                 // if API is used, default to the chosen settings
 752                 // but allow a specific override
 753
 754                 if($_REQUEST['api_source'] && intval(get_pconfig(local_user(),'facebook','post_by_default'))) {
 755                         if(! x($_REQUEST,'facebook_enable'))
 756                                 $fb_enable = 1;
 757                 }
 758
 759                 if(! $fb_enable)
 760                         return;
 761
 762                 if(strlen($b['postopts']))
 763                         $b['postopts'] .= ',';
 764                 $b['postopts'] .= 'facebook';
 765         }
 766 }
 767
 768
 769 /**
 770  * @param App $a
 771  * @param object $b
 772  */
 773 function fbpost_queue_hook(&$a,&$b) {
 774
 775         $qi = q("SELECT * FROM `queue` WHERE `network` = '%s'",
 776                 dbesc(NETWORK_FACEBOOK)
 777         );
 778         if(! count($qi))
 779                 return;
 780
 781         require_once('include/queue_fn.php');
 782
 783         foreach($qi as $x) {
 784                 if($x['network'] !== NETWORK_FACEBOOK)
 785                         continue;
 786
 787                 logger('facebook_queue: run');
 788
 789                 $r = q("SELECT `user`.* FROM `user` LEFT JOIN `contact` on `contact`.`uid` = `user`.`uid`
 790                         WHERE `contact`.`self` = 1 AND `contact`.`id` = %d LIMIT 1",
 791                         intval($x['cid'])
 792                 );
 793                 if(! count($r))
 794                         continue;
 795
 796                 $user = $r[0];
 797
 798                 $appid  = get_config('facebook', 'appid'  );
 799                 $secret = get_config('facebook', 'appsecret' );
 800
 801                 if($appid && $secret) {
 802                         $fb_post   = intval(get_pconfig($user['uid'],'facebook','post'));
 803                         $fb_token  = get_pconfig($user['uid'],'facebook','access_token');
 804
 805                         if($fb_post && $fb_token) {
 806                                 logger('facebook_queue: able to post');
 807                                 require_once('library/facebook.php');
 808
 809                                 $z = unserialize($x['content']);
 810                                 $item = $z['item'];
 811                                 $j = post_url($z['url'],$z['post']);
 812
 813                                 $retj = json_decode($j);
 814                                 if($retj->id) {
 815                                         q("UPDATE `item` SET `extid` = '%s' WHERE `id` = %d LIMIT 1",
 816                                                 dbesc('fb::' . $retj->id),
 817                                                 intval($item)
 818                                         );
 819                                         logger('facebook_queue: success: ' . $j);
 820                                         remove_queue_item($x['id']);
 821                                 }
 822                                 else {
 823                                         logger('facebook_queue: failed: ' . $j);
 824                                         update_queue_time($x['id']);
 825                                 }
 826                         }
 827                 }
 828         }
 829 }
 830
 831
 832 /**
 833  * @return bool|string
 834  */
 835 function fbpost_get_app_access_token() {
 836
 837         $acc_token = get_config('facebook','app_access_token');
 838
 839         if ($acc_token !== false) return $acc_token;
 840
 841         $appid = get_config('facebook','appid');
 842         $appsecret = get_config('facebook', 'appsecret');
 843
 844         if ($appid === false || $appsecret === false) {
 845                 logger('fb_get_app_access_token: appid and/or appsecret not set', LOGGER_DEBUG);
 846                 return false;
 847         }
 848         logger('https://graph.facebook.com/oauth/access_token?client_id=' . $appid . '&client_secret=' . $appsecret . '&grant_type=client_credentials', LOGGER_DATA);
 849         $x = fetch_url('https://graph.facebook.com/oauth/access_token?client_id=' . $appid . '&client_secret=' . $appsecret . '&grant_type=client_credentials');
 850
 851         if(strpos($x,'access_token=') !== false) {
 852                 logger('fb_get_app_access_token: returned access token: ' . $x, LOGGER_DATA);
 853
 854                 $token = str_replace('access_token=', '', $x);
 855                 if(strpos($token,'&') !== false)
 856                         $token = substr($token,0,strpos($token,'&'));
 857
 858                 if ($token == "") {
 859                         logger('fb_get_app_access_token: empty token: ' . $x, LOGGER_DEBUG);
 860                         return false;
 861                 }
 862                 set_config('facebook','app_access_token',$token);
 863                 return $token;
 864         } else {
 865                 logger('fb_get_app_access_token: response did not contain an access_token: ' . $x, LOGGER_DATA);
 866                 return false;
 867         }
 868 }
 869