src/Content/Text/BBCode.php

   1 <?php
   2 /**
   3  * @file src/Content/Text/BBCode.php
   4  */
   5
   6 namespace Friendica\Content\Text;
   7
   8 use DOMDocument;
   9 use DOMXPath;
  10 use Exception;
  11 use Friendica\Content\OEmbed;
  12 use Friendica\Content\Smilies;
  13 use Friendica\Core\Config;
  14 use Friendica\Core\Hook;
  15 use Friendica\Core\L10n;
  16 use Friendica\Core\Logger;
  17 use Friendica\Core\Protocol;
  18 use Friendica\Core\Renderer;
  19 use Friendica\Core\System;
  20 use Friendica\DI;
  21 use Friendica\Model\Contact;
  22 use Friendica\Model\Event;
  23 use Friendica\Model\Photo;
  24 use Friendica\Network\Probe;
  25 use Friendica\Object\Image;
  26 use Friendica\Protocol\Activity;
  27 use Friendica\Util\Images;
  28 use Friendica\Util\Map;
  29 use Friendica\Util\Network;
  30 use Friendica\Util\ParseUrl;
  31 use Friendica\Util\Proxy as ProxyUtils;
  32 use Friendica\Util\Strings;
  33 use Friendica\Util\XML;
  34
  35 class BBCode
  36 {
  37         /**
  38          * @brief Fetches attachment data that were generated the old way
  39          *
  40          * @param string $body Message body
  41          * @return array
  42          *                     'type' -> Message type ('link', 'video', 'photo')
  43          *                     'text' -> Text before the shared message
  44          *                     'after' -> Text after the shared message
  45          *                     'image' -> Preview image of the message
  46          *                     'url' -> Url to the attached message
  47          *                     'title' -> Title of the attachment
  48          *                     'description' -> Description of the attachment
  49          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  50          */
  51         private static function getOldAttachmentData($body)
  52         {
  53                 $post = [];
  54
  55                 // Simplify image codes
  56                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
  57
  58                 if (preg_match_all("(\[class=(.*?)\](.*?)\[\/class\])ism", $body, $attached, PREG_SET_ORDER)) {
  59                         foreach ($attached as $data) {
  60                                 if (!in_array($data[1], ['type-link', 'type-video', 'type-photo'])) {
  61                                         continue;
  62                                 }
  63
  64                                 $post['type'] = substr($data[1], 5);
  65
  66                                 $pos = strpos($body, $data[0]);
  67                                 if ($pos > 0) {
  68                                         $post['text'] = trim(substr($body, 0, $pos));
  69                                         $post['after'] = trim(substr($body, $pos + strlen($data[0])));
  70                                 } else {
  71                                         $post['text'] = trim(str_replace($data[0], '', $body));
  72                                         $post['after'] = '';
  73                                 }
  74
  75                                 $attacheddata = $data[2];
  76
  77                                 if (preg_match("/\[img\](.*?)\[\/img\]/ism", $attacheddata, $matches)) {
  78
  79                                         $picturedata = Images::getInfoFromURLCached($matches[1]);
  80
  81                                         if ($picturedata) {
  82                                                 if (($picturedata[0] >= 500) && ($picturedata[0] >= $picturedata[1])) {
  83                                                         $post['image'] = $matches[1];
  84                                                 } else {
  85                                                         $post['preview'] = $matches[1];
  86                                                 }
  87                                         }
  88                                 }
  89
  90                                 if (preg_match("/\[bookmark\=(.*?)\](.*?)\[\/bookmark\]/ism", $attacheddata, $matches)) {
  91                                         $post['url'] = $matches[1];
  92                                         $post['title'] = $matches[2];
  93                                 }
  94                                 if (!empty($post['url']) && (in_array($post['type'], ['link', 'video']))
  95                                         && preg_match("/\[url\=(.*?)\](.*?)\[\/url\]/ism", $attacheddata, $matches)) {
  96                                         $post['url'] = $matches[1];
  97                                 }
  98
  99                                 // Search for description
 100                                 if (preg_match("/\[quote\](.*?)\[\/quote\]/ism", $attacheddata, $matches)) {
 101                                         $post['description'] = $matches[1];
 102                                 }
 103                         }
 104                 }
 105                 return $post;
 106         }
 107
 108         /**
 109          * @brief Fetches attachment data that were generated with the "attachment" element
 110          *
 111          * @param string $body Message body
 112          * @return array
 113          *                     'type' -> Message type ('link', 'video', 'photo')
 114          *                     'text' -> Text before the shared message
 115          *                     'after' -> Text after the shared message
 116          *                     'image' -> Preview image of the message
 117          *                     'url' -> Url to the attached message
 118          *                     'title' -> Title of the attachment
 119          *                     'description' -> Description of the attachment
 120          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 121          */
 122         public static function getAttachmentData($body)
 123         {
 124                 $data = [
 125                         'type'        => '',
 126                         'text'        => '',
 127                         'after'       => '',
 128                         'image'       => null,
 129                         'url'         => '',
 130                         'title'       => '',
 131                         'description' => '',
 132                 ];
 133
 134                 if (!preg_match("/(.*)\[attachment(.*?)\](.*?)\[\/attachment\](.*)/ism", $body, $match)) {
 135                         return self::getOldAttachmentData($body);
 136                 }
 137
 138                 $attributes = $match[2];
 139
 140                 $data['text'] = trim($match[1]);
 141
 142                 $type = '';
 143                 preg_match("/type='(.*?)'/ism", $attributes, $matches);
 144                 if (!empty($matches[1])) {
 145                         $type = strtolower($matches[1]);
 146                 }
 147
 148                 preg_match('/type="(.*?)"/ism', $attributes, $matches);
 149                 if (!empty($matches[1])) {
 150                         $type = strtolower($matches[1]);
 151                 }
 152
 153                 if ($type == '') {
 154                         return [];
 155                 }
 156
 157                 if (!in_array($type, ['link', 'audio', 'photo', 'video'])) {
 158                         return [];
 159                 }
 160
 161                 if ($type != '') {
 162                         $data['type'] = $type;
 163                 }
 164
 165                 $url = '';
 166                 preg_match("/url='(.*?)'/ism", $attributes, $matches);
 167                 if (!empty($matches[1])) {
 168                         $url = $matches[1];
 169                 }
 170
 171                 preg_match('/url="(.*?)"/ism', $attributes, $matches);
 172                 if (!empty($matches[1])) {
 173                         $url = $matches[1];
 174                 }
 175
 176                 if ($url != '') {
 177                         $data['url'] = html_entity_decode($url, ENT_QUOTES, 'UTF-8');
 178                 }
 179
 180                 $title = '';
 181                 preg_match("/title='(.*?)'/ism", $attributes, $matches);
 182                 if (!empty($matches[1])) {
 183                         $title = $matches[1];
 184                 }
 185
 186                 preg_match('/title="(.*?)"/ism', $attributes, $matches);
 187                 if (!empty($matches[1])) {
 188                         $title = $matches[1];
 189                 }
 190
 191                 if ($title != '') {
 192                         $title = self::convert(html_entity_decode($title, ENT_QUOTES, 'UTF-8'), false, true);
 193                         $title = html_entity_decode($title, ENT_QUOTES, 'UTF-8');
 194                         $title = str_replace(['[', ']'], ['&#91;', '&#93;'], $title);
 195                         $data['title'] = $title;
 196                 }
 197
 198                 $image = '';
 199                 preg_match("/image='(.*?)'/ism", $attributes, $matches);
 200                 if (!empty($matches[1])) {
 201                         $image = $matches[1];
 202                 }
 203
 204                 preg_match('/image="(.*?)"/ism', $attributes, $matches);
 205                 if (!empty($matches[1])) {
 206                         $image = $matches[1];
 207                 }
 208
 209                 if ($image != '') {
 210                         $data['image'] = html_entity_decode($image, ENT_QUOTES, 'UTF-8');
 211                 }
 212
 213                 $preview = '';
 214                 preg_match("/preview='(.*?)'/ism", $attributes, $matches);
 215                 if (!empty($matches[1])) {
 216                         $preview = $matches[1];
 217                 }
 218
 219                 preg_match('/preview="(.*?)"/ism', $attributes, $matches);
 220                 if (!empty($matches[1])) {
 221                         $preview = $matches[1];
 222                 }
 223
 224                 if ($preview != '') {
 225                         $data['preview'] = html_entity_decode($preview, ENT_QUOTES, 'UTF-8');
 226                 }
 227
 228                 $data['description'] = trim($match[3]);
 229
 230                 $data['after'] = trim($match[4]);
 231
 232                 return $data;
 233         }
 234
 235         public static function getAttachedData($body, $item = [])
 236         {
 237                 /*
 238                 - text:
 239                 - type: link, video, photo
 240                 - title:
 241                 - url:
 242                 - image:
 243                 - description:
 244                 - (thumbnail)
 245                 */
 246
 247                 $has_title = !empty($item['title']);
 248                 $plink = $item['plink'] ?? '';
 249                 $post = self::getAttachmentData($body);
 250
 251                 // Get all linked images with alternative image description
 252                 if (preg_match_all("/\[img=([^\[\]]*)\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures, PREG_SET_ORDER)) {
 253                         foreach ($pictures as $picture) {
 254                                 if (Photo::isLocal($picture[1])) {
 255                                         $post['images'][] = ['url' => str_replace('-1.', '-0.', $picture[1]), 'description' => $picture[2]];
 256                                 }
 257                         }
 258                         if (!empty($post['images']) && !empty($post['images'][0]['description'])) {
 259                                 $post['image_description'] = $post['images'][0]['description'];
 260                         }
 261                 }
 262
 263                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures, PREG_SET_ORDER)) {
 264                         foreach ($pictures as $picture) {
 265                                 if (Photo::isLocal($picture[1])) {
 266                                         $post['images'][] = ['url' => str_replace('-1.', '-0.', $picture[1]), 'description' => ''];
 267                                 }
 268                         }
 269                 }
 270
 271                 // if nothing is found, it maybe having an image.
 272                 if (!isset($post['type'])) {
 273                         // Simplify image codes
 274                         $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 275                         $body = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/ism", '[img]$1[/img]', $body);
 276                         $post['text'] = $body;
 277
 278                         if (preg_match_all("(\[url=(.*?)\]\s*\[img\](.*?)\[\/img\]\s*\[\/url\])ism", $body, $pictures, PREG_SET_ORDER)) {
 279                                 if ((count($pictures) == 1) && !$has_title) {
 280                                         if (!empty($item['object-type']) && ($item['object-type'] == Activity\ObjectType::IMAGE)) {
 281                                                 // Replace the preview picture with the real picture
 282                                                 $url = str_replace('-1.', '-0.', $pictures[0][2]);
 283                                                 $data = ['url' => $url, 'type' => 'photo'];
 284                                         } else {
 285                                                 // Checking, if the link goes to a picture
 286                                                 $data = ParseUrl::getSiteinfoCached($pictures[0][1], true);
 287                                         }
 288
 289                                         // Workaround:
 290                                         // Sometimes photo posts to the own album are not detected at the start.
 291                                         // So we seem to cannot use the cache for these cases. That's strange.
 292                                         if (($data['type'] != 'photo') && strstr($pictures[0][1], "/photos/")) {
 293                                                 $data = ParseUrl::getSiteinfo($pictures[0][1], true);
 294                                         }
 295
 296                                         if ($data['type'] == 'photo') {
 297                                                 $post['type'] = 'photo';
 298                                                 if (isset($data['images'][0])) {
 299                                                         $post['image'] = $data['images'][0]['src'];
 300                                                         $post['url'] = $data['url'];
 301                                                 } else {
 302                                                         $post['image'] = $data['url'];
 303                                                 }
 304
 305                                                 $post['preview'] = $pictures[0][2];
 306                                                 $post['text'] = trim(str_replace($pictures[0][0], '', $body));
 307                                         } else {
 308                                                 $imgdata = Images::getInfoFromURLCached($pictures[0][1]);
 309                                                 if ($imgdata && substr($imgdata['mime'], 0, 6) == 'image/') {
 310                                                         $post['type'] = 'photo';
 311                                                         $post['image'] = $pictures[0][1];
 312                                                         $post['preview'] = $pictures[0][2];
 313                                                         $post['text'] = trim(str_replace($pictures[0][0], '', $body));
 314                                                 }
 315                                         }
 316                                 } elseif (count($pictures) > 0) {
 317                                         $post['type'] = 'link';
 318                                         $post['url'] = $plink;
 319                                         $post['image'] = $pictures[0][2];
 320                                         $post['text'] = $body;
 321
 322                                         foreach ($pictures as $picture) {
 323                                                 $post['text'] = trim(str_replace($picture[0], '', $post['text']));
 324                                         }
 325                                 }
 326                         } elseif (preg_match_all("(\[img\](.*?)\[\/img\])ism", $body, $pictures, PREG_SET_ORDER)) {
 327                                 if ((count($pictures) == 1) && !$has_title) {
 328                                         $post['type'] = 'photo';
 329                                         $post['image'] = $pictures[0][1];
 330                                         $post['text'] = str_replace($pictures[0][0], '', $body);
 331                                 } elseif (count($pictures) > 0) {
 332                                         $post['type'] = 'link';
 333                                         $post['url'] = $plink;
 334                                         $post['image'] = $pictures[0][1];
 335                                         $post['text'] = $body;
 336
 337                                         foreach ($pictures as $picture) {
 338                                                 $post['text'] = trim(str_replace($picture[0], '', $post['text']));
 339                                         }
 340                                 }
 341                         }
 342
 343                         // Test for the external links
 344                         preg_match_all("(\[url\](.*?)\[\/url\])ism", $post['text'], $links1, PREG_SET_ORDER);
 345                         preg_match_all("(\[url\=(.*?)\].*?\[\/url\])ism", $post['text'], $links2, PREG_SET_ORDER);
 346
 347                         $links = array_merge($links1, $links2);
 348
 349                         // If there is only a single one, then use it.
 350                         // This should cover link posts via API.
 351                         if ((count($links) == 1) && !isset($post['preview']) && !$has_title) {
 352                                 $post['type'] = 'link';
 353                                 $post['url'] = $links[0][1];
 354                         }
 355
 356                         // Simplify "video" element
 357                         $post['text'] = preg_replace('(\[video.*?\ssrc\s?=\s?([^\s\]]+).*?\].*?\[/video\])ism', '[video]$1[/video]', $post['text']);
 358
 359                         // Now count the number of external media links
 360                         preg_match_all("(\[vimeo\](.*?)\[\/vimeo\])ism", $post['text'], $links1, PREG_SET_ORDER);
 361                         preg_match_all("(\[youtube\\](.*?)\[\/youtube\\])ism", $post['text'], $links2, PREG_SET_ORDER);
 362                         preg_match_all("(\[video\\](.*?)\[\/video\\])ism", $post['text'], $links3, PREG_SET_ORDER);
 363                         preg_match_all("(\[audio\\](.*?)\[\/audio\\])ism", $post['text'], $links4, PREG_SET_ORDER);
 364
 365                         // Add them to the other external links
 366                         $links = array_merge($links, $links1, $links2, $links3, $links4);
 367
 368                         // Are there more than one?
 369                         if (count($links) > 1) {
 370                                 // The post will be the type "text", which means a blog post
 371                                 unset($post['type']);
 372                                 $post['url'] = $plink;
 373                         }
 374
 375                         if (!isset($post['type'])) {
 376                                 $post['type'] = "text";
 377                                 $post['text'] = trim($body);
 378                         }
 379                 } elseif (isset($post['url']) && ($post['type'] == 'video')) {
 380                         $data = ParseUrl::getSiteinfoCached($post['url'], true);
 381
 382                         if (isset($data['images'][0])) {
 383                                 $post['image'] = $data['images'][0]['src'];
 384                         }
 385                 }
 386
 387                 return $post;
 388         }
 389
 390         /**
 391          * Remove [attachment] BBCode and replaces it with a regular [url]
 392          *
 393          * @param string  $body
 394          * @param boolean $no_link_desc No link description
 395          *
 396          * @return string with replaced body
 397          */
 398         public static function removeAttachment($body, $no_link_desc = false)
 399         {
 400                 return preg_replace_callback("/\s*\[attachment (.*)\](.*?)\[\/attachment\]\s*/ism",
 401                         function ($match) use ($no_link_desc) {
 402                                 $attach_data = self::getAttachmentData($match[0]);
 403                                 if (empty($attach_data['url'])) {
 404                                         return $match[0];
 405                                 } elseif (empty($attach_data['title']) || $no_link_desc) {
 406                                         return "\n[url]" . $attach_data['url'] . "[/url]\n";
 407                                 } else {
 408                                         return "\n[url=" . $attach_data['url'] . ']' . $attach_data['title'] . "[/url]\n";
 409                                 }
 410                 }, $body);
 411         }
 412
 413         /**
 414          * @brief Converts a BBCode text into plaintext
 415          *
 416          * @param      $text
 417          * @param bool $keep_urls Whether to keep URLs in the resulting plaintext
 418          *
 419          * @return string
 420          */
 421         public static function toPlaintext($text, $keep_urls = true)
 422         {
 423                 $naked_text = HTML::toPlaintext(BBCode::convert($text, false, 0, true), 0, !$keep_urls);
 424
 425                 return $naked_text;
 426         }
 427
 428         private static function proxyUrl($image, $simplehtml = false)
 429         {
 430                 // Only send proxied pictures to API and for internal display
 431                 if (in_array($simplehtml, [false, 2])) {
 432                         return ProxyUtils::proxifyUrl($image);
 433                 } else {
 434                         return $image;
 435                 }
 436         }
 437
 438         public static function scaleExternalImages($srctext)
 439         {
 440                 $s = $srctext;
 441
 442                 $matches = null;
 443                 $c = preg_match_all('/\[img.*?\](.*?)\[\/img\]/ism', $s, $matches, PREG_SET_ORDER);
 444                 if ($c) {
 445                         foreach ($matches as $mtch) {
 446                                 Logger::log('scale_external_image: ' . $mtch[1]);
 447
 448                                 $hostname = str_replace('www.', '', substr(DI::baseUrl(), strpos(DI::baseUrl(), '://') + 3));
 449                                 if (stristr($mtch[1], $hostname)) {
 450                                         continue;
 451                                 }
 452
 453                                 $i = Network::fetchUrl($mtch[1]);
 454                                 if (!$i) {
 455                                         return $srctext;
 456                                 }
 457
 458                                 // guess mimetype from headers or filename
 459                                 $type = Images::guessType($mtch[1], true);
 460
 461                                 if ($i) {
 462                                         $Image = new Image($i, $type);
 463                                         if ($Image->isValid()) {
 464                                                 $orig_width = $Image->getWidth();
 465                                                 $orig_height = $Image->getHeight();
 466
 467                                                 if ($orig_width > 640 || $orig_height > 640) {
 468                                                         $Image->scaleDown(640);
 469                                                         $new_width = $Image->getWidth();
 470                                                         $new_height = $Image->getHeight();
 471                                                         Logger::log('scale_external_images: ' . $orig_width . '->' . $new_width . 'w ' . $orig_height . '->' . $new_height . 'h' . ' match: ' . $mtch[0], Logger::DEBUG);
 472                                                         $s = str_replace(
 473                                                                 $mtch[0],
 474                                                                 '[img=' . $new_width . 'x' . $new_height. ']' . $mtch[1] . '[/img]'
 475                                                                 . "\n",
 476                                                                 $s
 477                                                         );
 478                                                         Logger::log('scale_external_images: new string: ' . $s, Logger::DEBUG);
 479                                                 }
 480                                         }
 481                                 }
 482                         }
 483                 }
 484
 485                 return $s;
 486         }
 487
 488         /**
 489          * The purpose of this function is to apply system message length limits to
 490          * imported messages without including any embedded photos in the length
 491          *
 492          * @brief Truncates imported message body string length to max_import_size
 493          * @param string $body
 494          * @return string
 495          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 496          */
 497         public static function limitBodySize($body)
 498         {
 499                 $maxlen = Config::get('config', 'max_import_size', 0);
 500
 501                 // If the length of the body, including the embedded images, is smaller
 502                 // than the maximum, then don't waste time looking for the images
 503                 if ($maxlen && (strlen($body) > $maxlen)) {
 504
 505                         Logger::log('the total body length exceeds the limit', Logger::DEBUG);
 506
 507                         $orig_body = $body;
 508                         $new_body = '';
 509                         $textlen = 0;
 510
 511                         $img_start = strpos($orig_body, '[img');
 512                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 513                         $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 514                         while (($img_st_close !== false) && ($img_end !== false)) {
 515
 516                                 $img_st_close++; // make it point to AFTER the closing bracket
 517                                 $img_end += $img_start;
 518                                 $img_end += strlen('[/img]');
 519
 520                                 if (!strcmp(substr($orig_body, $img_start + $img_st_close, 5), 'data:')) {
 521                                         // This is an embedded image
 522
 523                                         if (($textlen + $img_start) > $maxlen) {
 524                                                 if ($textlen < $maxlen) {
 525                                                         Logger::log('the limit happens before an embedded image', Logger::DEBUG);
 526                                                         $new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 527                                                         $textlen = $maxlen;
 528                                                 }
 529                                         } else {
 530                                                 $new_body = $new_body . substr($orig_body, 0, $img_start);
 531                                                 $textlen += $img_start;
 532                                         }
 533
 534                                         $new_body = $new_body . substr($orig_body, $img_start, $img_end - $img_start);
 535                                 } else {
 536
 537                                         if (($textlen + $img_end) > $maxlen) {
 538                                                 if ($textlen < $maxlen) {
 539                                                         Logger::log('the limit happens before the end of a non-embedded image', Logger::DEBUG);
 540                                                         $new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 541                                                         $textlen = $maxlen;
 542                                                 }
 543                                         } else {
 544                                                 $new_body = $new_body . substr($orig_body, 0, $img_end);
 545                                                 $textlen += $img_end;
 546                                         }
 547                                 }
 548                                 $orig_body = substr($orig_body, $img_end);
 549
 550                                 if ($orig_body === false) {
 551                                         // in case the body ends on a closing image tag
 552                                         $orig_body = '';
 553                                 }
 554
 555                                 $img_start = strpos($orig_body, '[img');
 556                                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 557                                 $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 558                         }
 559
 560                         if (($textlen + strlen($orig_body)) > $maxlen) {
 561                                 if ($textlen < $maxlen) {
 562                                         Logger::log('the limit happens after the end of the last image', Logger::DEBUG);
 563                                         $new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 564                                 }
 565                         } else {
 566                                 Logger::log('the text size with embedded images extracted did not violate the limit', Logger::DEBUG);
 567                                 $new_body = $new_body . $orig_body;
 568                         }
 569
 570                         return $new_body;
 571                 } else {
 572                         return $body;
 573                 }
 574         }
 575
 576         /**
 577          * Processes [attachment] tags
 578          *
 579          * Note: Can produce a [bookmark] tag in the returned string
 580          *
 581          * @brief Processes [attachment] tags
 582          * @param string   $text
 583          * @param bool|int $simplehtml
 584          * @param bool     $tryoembed
 585          * @return string
 586          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 587          */
 588         private static function convertAttachment($text, $simplehtml = false, $tryoembed = true)
 589         {
 590                 $data = self::getAttachmentData($text);
 591                 if (empty($data) || empty($data['url'])) {
 592                         return $text;
 593                 }
 594
 595                 if (isset($data['title'])) {
 596                         $data['title'] = strip_tags($data['title']);
 597                         $data['title'] = str_replace(['http://', 'https://'], '', $data['title']);
 598                 } else {
 599                         $data['title'] = null;
 600                 }
 601
 602                 if (((strpos($data['text'], "[img=") !== false) || (strpos($data['text'], "[img]") !== false) || Config::get('system', 'always_show_preview')) && !empty($data['image'])) {
 603                         $data['preview'] = $data['image'];
 604                         $data['image'] = '';
 605                 }
 606
 607                 $return = '';
 608                 try {
 609                         if ($tryoembed && OEmbed::isAllowedURL($data['url'])) {
 610                                 $return = OEmbed::getHTML($data['url'], $data['title']);
 611                         } else {
 612                                 throw new Exception('OEmbed is disabled for this attachment.');
 613                         }
 614                 } catch (Exception $e) {
 615                         $data['title'] = ($data['title'] ?? '') ?: $data['url'];
 616
 617                         if ($simplehtml != 4) {
 618                                 $return = sprintf('<div class="type-%s">', $data['type']);
 619                         }
 620
 621                         if (!empty($data['title']) && !empty($data['url'])) {
 622                                 if (!empty($data['image']) && empty($data['text']) && ($data['type'] == 'photo')) {
 623                                         $return .= sprintf('<a href="%s" target="_blank"><img src="%s" alt="" title="%s" class="attachment-image" /></a>', $data['url'], self::proxyUrl($data['image'], $simplehtml), $data['title']);
 624                                 } else {
 625                                         if (!empty($data['image'])) {
 626                                                 $return .= sprintf('<a href="%s" target="_blank"><img src="%s" alt="" title="%s" class="attachment-image" /></a><br />', $data['url'], self::proxyUrl($data['image'], $simplehtml), $data['title']);
 627                                         } elseif (!empty($data['preview'])) {
 628                                                 $return .= sprintf('<a href="%s" target="_blank"><img src="%s" alt="" title="%s" class="attachment-preview" /></a><br />', $data['url'], self::proxyUrl($data['preview'], $simplehtml), $data['title']);
 629                                         }
 630                                         $return .= sprintf('<h4><a href="%s">%s</a></h4>', $data['url'], $data['title']);
 631                                 }
 632                         }
 633
 634                         if (!empty($data['description']) && $data['description'] != $data['title']) {
 635                                 // Sanitize the HTML by converting it to BBCode
 636                                 $bbcode = HTML::toBBCode($data['description']);
 637                                 $return .= sprintf('<blockquote>%s</blockquote>', trim(self::convert($bbcode)));
 638                         }
 639
 640                         if (!empty($data['url'])) {
 641                                 $return .= sprintf('<sup><a href="%s">%s</a></sup>', $data['url'], parse_url($data['url'], PHP_URL_HOST));
 642                         }
 643
 644                         if ($simplehtml != 4) {
 645                                 $return .= '</div>';
 646                         }
 647                 }
 648
 649                 return trim(($data['text'] ?? '') . ' ' . $return . ' ' . ($data['after'] ?? ''));
 650         }
 651
 652         public static function removeShareInformation($Text, $plaintext = false, $nolink = false)
 653         {
 654                 $data = self::getAttachmentData($Text);
 655
 656                 if (!$data) {
 657                         return $Text;
 658                 } elseif ($nolink) {
 659                         return $data['text'] . ($data['after'] ?? '');
 660                 }
 661
 662                 $title = htmlentities($data['title'] ?? '', ENT_QUOTES, 'UTF-8', false);
 663                 $text = htmlentities($data['text'], ENT_QUOTES, 'UTF-8', false);
 664                 if ($plaintext || (($title != '') && strstr($text, $title))) {
 665                         $data['title'] = $data['url'];
 666                 } elseif (($text != '') && strstr($title, $text)) {
 667                         $data['text'] = $data['title'];
 668                         $data['title'] = $data['url'];
 669                 }
 670
 671                 if (empty($data['text']) && !empty($data['title']) && empty($data['url'])) {
 672                         return $data['title'] . $data['after'];
 673                 }
 674
 675                 // If the link already is included in the post, don't add it again
 676                 if (!empty($data['url']) && strpos($data['text'], $data['url'])) {
 677                         return $data['text'] . $data['after'];
 678                 }
 679
 680                 $text = $data['text'];
 681
 682                 if (!empty($data['url']) && !empty($data['title'])) {
 683                         $text .= "\n[url=" . $data['url'] . ']' . $data['title'] . '[/url]';
 684                 } elseif (!empty($data['url'])) {
 685                         $text .= "\n[url]" . $data['url'] . '[/url]';
 686                 }
 687
 688                 return $text . "\n" . $data['after'];
 689         }
 690
 691         /**
 692          * Converts [url] BBCodes in a format that looks fine on Mastodon. (callback function)
 693          *
 694          * @brief Converts [url] BBCodes in a format that looks fine on Mastodon. (callback function)
 695          * @param array $match Array with the matching values
 696          * @return string reformatted link including HTML codes
 697          */
 698         private static function convertUrlForActivityPubCallback($match)
 699         {
 700                 $url = $match[1];
 701
 702                 if (isset($match[2]) && ($match[1] != $match[2])) {
 703                         return $match[0];
 704                 }
 705
 706                 $parts = parse_url($url);
 707                 if (!isset($parts['scheme'])) {
 708                         return $match[0];
 709                 }
 710
 711                 return self::convertUrlForActivityPub($url);
 712         }
 713
 714         /**
 715          * @brief Converts [url] BBCodes in a format that looks fine on ActivityPub systems.
 716          * @param string $url URL that is about to be reformatted
 717          * @return string reformatted link including HTML codes
 718          */
 719         private static function convertUrlForActivityPub($url)
 720         {
 721                 $html = '<a href="%s" target="_blank">%s</a>';
 722                 return sprintf($html, $url, self::getStyledURL($url));
 723         }
 724
 725         /**
 726          * Converts an URL in a nicer format (without the scheme and possibly shortened)
 727          * @param string $url URL that is about to be reformatted
 728          * @return string reformatted link
 729          */
 730         private static function getStyledURL($url)
 731         {
 732                 $parts = parse_url($url);
 733                 $scheme = $parts['scheme'] . '://';
 734                 $styled_url = str_replace($scheme, '', $url);
 735
 736                 if (strlen($styled_url) > 30) {
 737                         $styled_url = substr($styled_url, 0, 30) . "…";
 738                 }
 739
 740                 return $styled_url;
 741         }
 742
 743         /*
 744          * [noparse][i]italic[/i][/noparse] turns into
 745          * [noparse][ i ]italic[ /i ][/noparse],
 746          * to hide them from parser.
 747          */
 748         private static function escapeNoparseCallback($match)
 749         {
 750                 $whole_match = $match[0];
 751                 $captured = $match[1];
 752                 $spacefied = preg_replace("/\[(.*?)\]/", "[ $1 ]", $captured);
 753                 $new_str = str_replace($captured, $spacefied, $whole_match);
 754                 return $new_str;
 755         }
 756
 757         /*
 758          * The previously spacefied [noparse][ i ]italic[ /i ][/noparse],
 759          * now turns back and the [noparse] tags are trimed
 760          * returning [i]italic[/i]
 761          */
 762         private static function unescapeNoparseCallback($match)
 763         {
 764                 $captured = $match[1];
 765                 $unspacefied = preg_replace("/\[ (.*?)\ ]/", "[$1]", $captured);
 766                 return $unspacefied;
 767         }
 768
 769         /**
 770          * Returns the bracket character positions of a set of opening and closing BBCode tags, optionally skipping first
 771          * occurrences
 772          *
 773          * @param string $text        Text to search
 774          * @param string $name        Tag name
 775          * @param int    $occurrences Number of first occurrences to skip
 776          * @return boolean|array
 777          */
 778         public static function getTagPosition($text, $name, $occurrences = 0)
 779         {
 780                 if ($occurrences < 0) {
 781                         $occurrences = 0;
 782                 }
 783
 784                 $start_open = -1;
 785                 for ($i = 0; $i <= $occurrences; $i++) {
 786                         if ($start_open !== false) {
 787                                 $start_open = strpos($text, '[' . $name, $start_open + 1); // allow [name= type tags
 788                         }
 789                 }
 790
 791                 if ($start_open === false) {
 792                         return false;
 793                 }
 794
 795                 $start_equal = strpos($text, '=', $start_open);
 796                 $start_close = strpos($text, ']', $start_open);
 797
 798                 if ($start_close === false) {
 799                         return false;
 800                 }
 801
 802                 $start_close++;
 803
 804                 $end_open = strpos($text, '[/' . $name . ']', $start_close);
 805
 806                 if ($end_open === false) {
 807                         return false;
 808                 }
 809
 810                 $res = [
 811                         'start' => [
 812                                 'open' => $start_open,
 813                                 'close' => $start_close
 814                         ],
 815                         'end' => [
 816                                 'open' => $end_open,
 817                                 'close' => $end_open + strlen('[/' . $name . ']')
 818                         ],
 819                 ];
 820
 821                 if ($start_equal !== false) {
 822                         $res['start']['equal'] = $start_equal + 1;
 823                 }
 824
 825                 return $res;
 826         }
 827
 828         /**
 829          * Performs a preg_replace within the boundaries of all named BBCode tags in a text
 830          *
 831          * @param string $pattern Preg pattern string
 832          * @param string $replace Preg replace string
 833          * @param string $name    BBCode tag name
 834          * @param string $text    Text to search
 835          * @return string
 836          */
 837         public static function pregReplaceInTag($pattern, $replace, $name, $text)
 838         {
 839                 $occurrences = 0;
 840                 $pos = self::getTagPosition($text, $name, $occurrences);
 841                 while ($pos !== false && $occurrences++ < 1000) {
 842                         $start = substr($text, 0, $pos['start']['open']);
 843                         $subject = substr($text, $pos['start']['open'], $pos['end']['close'] - $pos['start']['open']);
 844                         $end = substr($text, $pos['end']['close']);
 845                         if ($end === false) {
 846                                 $end = '';
 847                         }
 848
 849                         $subject = preg_replace($pattern, $replace, $subject);
 850                         $text = $start . $subject . $end;
 851
 852                         $pos = self::getTagPosition($text, $name, $occurrences);
 853                 }
 854
 855                 return $text;
 856         }
 857
 858         private static function extractImagesFromItemBody($body)
 859         {
 860                 $saved_image = [];
 861                 $orig_body = $body;
 862                 $new_body = '';
 863
 864                 $cnt = 0;
 865                 $img_start = strpos($orig_body, '[img');
 866                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 867                 $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 868                 while (($img_st_close !== false) && ($img_end !== false)) {
 869                         $img_st_close++; // make it point to AFTER the closing bracket
 870                         $img_end += $img_start;
 871
 872                         if (!strcmp(substr($orig_body, $img_start + $img_st_close, 5), 'data:')) {
 873                                 // This is an embedded image
 874                                 $saved_image[$cnt] = substr($orig_body, $img_start + $img_st_close, $img_end - ($img_start + $img_st_close));
 875                                 $new_body = $new_body . substr($orig_body, 0, $img_start) . '[$#saved_image' . $cnt . '#$]';
 876
 877                                 $cnt++;
 878                         } else {
 879                                 $new_body = $new_body . substr($orig_body, 0, $img_end + strlen('[/img]'));
 880                         }
 881
 882                         $orig_body = substr($orig_body, $img_end + strlen('[/img]'));
 883
 884                         if ($orig_body === false) {
 885                                 // in case the body ends on a closing image tag
 886                                 $orig_body = '';
 887                         }
 888
 889                         $img_start = strpos($orig_body, '[img');
 890                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 891                         $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 892                 }
 893
 894                 $new_body = $new_body . $orig_body;
 895
 896                 return ['body' => $new_body, 'images' => $saved_image];
 897         }
 898
 899         private static function interpolateSavedImagesIntoItemBody($body, array $images)
 900         {
 901                 $newbody = $body;
 902
 903                 $cnt = 0;
 904                 foreach ($images as $image) {
 905                         // We're depending on the property of 'foreach' (specified on the PHP website) that
 906                         // it loops over the array starting from the first element and going sequentially
 907                         // to the last element
 908                         $newbody = str_replace('[$#saved_image' . $cnt . '#$]',
 909                                 '<img src="' . self::proxyUrl($image) . '" alt="' . L10n::t('Image/photo') . '" />', $newbody);
 910                         $cnt++;
 911                 }
 912
 913                 return $newbody;
 914         }
 915
 916         /**
 917          * This function converts a [share] block to text according to a provided callback function whose signature is:
 918          *
 919          * function(array $attributes, array $author_contact, string $content, boolean $is_quote_share): string
 920          *
 921          * Where:
 922          * - $attributes is an array of attributes of the [share] block itself. Missing keys will be completed by the contact
 923          * data lookup
 924          * - $author_contact is a contact record array
 925          * - $content is the inner content of the [share] block
 926          * - $is_quote_share indicates whether there's any content before the [share] block
 927          * - Return value is the string that should replace the [share] block in the provided text
 928          *
 929          * This function is intended to be used by addon connector to format a share block like the target network is expecting it.
 930          *
 931          * @param  string   $text     A BBCode string
 932          * @param  callable $callback
 933          * @return string The BBCode string with all [share] blocks replaced
 934          */
 935         public static function convertShare($text, callable $callback)
 936         {
 937                 $return = preg_replace_callback(
 938                         "/(.*?)\[share(.*?)\](.*)\[\/share\]/ism",
 939                         function ($match) use ($callback) {
 940                                 $attribute_string = $match[2];
 941                                 $attributes = [];
 942                                 foreach (['author', 'profile', 'avatar', 'link', 'posted'] as $field) {
 943                                         preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches);
 944                                         $attributes[$field] = html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8');
 945                                 }
 946
 947                                 // We only call this so that a previously unknown contact can be added.
 948                                 // This is important for the function "Model\Contact::getDetailsByURL()".
 949                                 // This function then can fetch an entry from the contact table.
 950                                 $default['url'] = $attributes['profile'];
 951
 952                                 if (!empty($attributes['author'])) {
 953                                         $default['name'] = $attributes['author'];
 954                                 }
 955
 956                                 if (!empty($attributes['avatar'])) {
 957                                         $default['photo'] = $attributes['avatar'];
 958                                 }
 959
 960                                 Contact::getIdForURL($attributes['profile'], 0, true, $default);
 961
 962                                 $author_contact = Contact::getDetailsByURL($attributes['profile']);
 963                                 $author_contact['addr'] = ($author_contact['addr']  ?? '') ?: Protocol::getAddrFromProfileUrl($attributes['profile']);
 964
 965                                 $attributes['author']   = ($author_contact['name']  ?? '') ?: $attributes['author'];
 966                                 $attributes['avatar']   = ($author_contact['micro'] ?? '') ?: $attributes['avatar'];
 967                                 $attributes['profile']  = ($author_contact['url']   ?? '') ?: $attributes['profile'];
 968
 969                                 if ($attributes['avatar']) {
 970                                         $attributes['avatar'] = ProxyUtils::proxifyUrl($attributes['avatar'], false, ProxyUtils::SIZE_THUMB);
 971                                 }
 972
 973                                 return $match[1] . $callback($attributes, $author_contact, $match[3], trim($match[1]) != '');
 974                         },
 975                         $text
 976                 );
 977
 978                 return $return;
 979         }
 980
 981         /**
 982          * Default [share] tag conversion callback
 983          *
 984          * Note: Can produce a [bookmark] tag in the output
 985          *
 986          * @see BBCode::convertShare()
 987          * @param array   $attributes     [share] block attribute values
 988          * @param array   $author_contact Contact row of the shared author
 989          * @param string  $content        Inner content of the [share] block
 990          * @param boolean $is_quote_share Whether there is content before the [share] block
 991          * @param integer $simplehtml     Mysterious integer value depending on the target network/formatting style
 992          * @return string
 993          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 994          */
 995         private static function convertShareCallback(array $attributes, array $author_contact, $content, $is_quote_share, $simplehtml)
 996         {
 997                 $mention = Protocol::formatMention($attributes['profile'], $attributes['author']);
 998
 999                 switch ($simplehtml) {
1000                         case 1:
1001                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' <a href="' . $attributes['profile'] . '">' . $mention . '</a>: </p>' . "\n" . '«' . $content . '»';
1002                                 break;
1003                         case 2:
1004                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' ' . $author_contact['addr'] . ': </p>' . "\n" . $content;
1005                                 break;
1006                         case 3: // Diaspora
1007                                 if (stripos(Strings::normaliseLink($attributes['link']), 'http://twitter.com/') === 0) {
1008                                         $text = ($is_quote_share? '<hr />' : '') . '<p><a href="' . $attributes['link'] . '">' . $attributes['link'] . '</a></p>' . "\n";
1009                                 } else {
1010                                         $headline = '<p><b>♲ <a href="' . $attributes['profile'] . '">' . $attributes['author'] . '</a>:</b></p>' . "\n";
1011
1012                                         if (!empty($attributes['posted']) && !empty($attributes['link'])) {
1013                                                 $headline = '<p><b>♲ <a href="' . $attributes['profile'] . '">' . $attributes['author'] . '</a></b> - <a href="' . $attributes['link'] . '">' . $attributes['posted'] . ' GMT</a></p>' . "\n";
1014                                         }
1015
1016                                         $text = ($is_quote_share? '<hr />' : '') . $headline . '<blockquote>' . trim($content) . '</blockquote>' . "\n";
1017
1018                                         if (empty($attributes['posted']) && !empty($attributes['link'])) {
1019                                                 $text .= '<p><a href="' . $attributes['link'] . '">[Source]</a></p>' . "\n";
1020                                         }
1021                                 }
1022
1023                                 break;
1024                         case 4:
1025                                 $headline = '<p><b>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8');
1026                                 $headline .= L10n::t('<a href="%1$s" target="_blank">%2$s</a> %3$s', $attributes['link'], $mention, $attributes['posted']);
1027                                 $headline .= ':</b></p>' . "\n";
1028
1029                                 $text = ($is_quote_share? '<hr />' : '') . $headline . '<blockquote class="shared_content">' . trim($content) . '</blockquote>' . "\n";
1030
1031                                 break;
1032                         case 5:
1033                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' ' . $author_contact['addr'] . ': </p>' . "\n" . $content;
1034                                 break;
1035                         case 7: // statusnet/GNU Social
1036                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' @' . $author_contact['addr'] . ': ' . $content . '</p>' . "\n";
1037                                 break;
1038                         case 9: // ActivityPub
1039                                 $author = '@<span class="vcard"><a href="' . $author_contact['url'] . '" class="url u-url mention" title="' . $author_contact['addr'] . '"><span class="fn nickname mention">' . $author_contact['addr'] . '</span></a>:</span>';
1040                                 $text = '<div><a href="' . $attributes['link'] . '">' . html_entity_decode('&#x2672;', ENT_QUOTES, 'UTF-8') . '</a> ' . $author . '<blockquote>' . $content . '</blockquote></div>' . "\n";
1041                                 break;
1042                         default:
1043                                 // Transforms quoted tweets in rich attachments to avoid nested tweets
1044                                 if (stripos(Strings::normaliseLink($attributes['link']), 'http://twitter.com/') === 0 && OEmbed::isAllowedURL($attributes['link'])) {
1045                                         try {
1046                                                 $text = ($is_quote_share? '<br />' : '') . OEmbed::getHTML($attributes['link']);
1047                                         } catch (Exception $e) {
1048                                                 $text = ($is_quote_share? '<br />' : '') . sprintf('[bookmark=%s]%s[/bookmark]', $attributes['link'], $content);
1049                                         }
1050                                 } else {
1051                                         $text = ($is_quote_share? "\n" : '');
1052
1053                                         $tpl = Renderer::getMarkupTemplate('shared_content.tpl');
1054                                         $text .= Renderer::replaceMacros($tpl, [
1055                                                 '$profile' => $attributes['profile'],
1056                                                 '$avatar'  => $attributes['avatar'],
1057                                                 '$author'  => $attributes['author'],
1058                                                 '$link'    => $attributes['link'],
1059                                                 '$posted'  => $attributes['posted'],
1060                                                 '$content' => trim($content)
1061                                         ]);
1062                                 }
1063                                 break;
1064                 }
1065
1066                 return $text;
1067         }
1068
1069         private static function removePictureLinksCallback($match)
1070         {
1071                 $cache_key = 'remove:' . $match[1];
1072                 $text = DI::cache()->get($cache_key);
1073
1074                 if (is_null($text)) {
1075                         $a = DI::app();
1076
1077                         $stamp1 = microtime(true);
1078
1079                         $ch = @curl_init($match[1]);
1080                         @curl_setopt($ch, CURLOPT_NOBODY, true);
1081                         @curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
1082                         @curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
1083                         @curl_exec($ch);
1084                         $curl_info = @curl_getinfo($ch);
1085
1086                         DI::profiler()->saveTimestamp($stamp1, "network", System::callstack());
1087
1088                         if (substr($curl_info['content_type'], 0, 6) == 'image/') {
1089                                 $text = "[url=" . $match[1] . ']' . $match[1] . "[/url]";
1090                         } else {
1091                                 $text = "[url=" . $match[2] . ']' . $match[2] . "[/url]";
1092
1093                                 // if its not a picture then look if its a page that contains a picture link
1094                                 $body = Network::fetchUrl($match[1]);
1095
1096                                 $doc = new DOMDocument();
1097                                 @$doc->loadHTML($body);
1098                                 $xpath = new DOMXPath($doc);
1099                                 $list = $xpath->query("//meta[@name]");
1100                                 foreach ($list as $node) {
1101                                         $attr = [];
1102
1103                                         if ($node->attributes->length) {
1104                                                 foreach ($node->attributes as $attribute) {
1105                                                         $attr[$attribute->name] = $attribute->value;
1106                                                 }
1107                                         }
1108
1109                                         if (strtolower($attr['name']) == 'twitter:image') {
1110                                                 $text = '[url=' . $attr['content'] . ']' . $attr['content'] . '[/url]';
1111                                         }
1112                                 }
1113                         }
1114                         DI::cache()->set($cache_key, $text);
1115                 }
1116
1117                 return $text;
1118         }
1119
1120         private static function expandLinksCallback($match)
1121         {
1122                 if (($match[3] == '') || ($match[2] == $match[3]) || stristr($match[2], $match[3])) {
1123                         return ($match[1] . "[url]" . $match[2] . "[/url]");
1124                 } else {
1125                         return ($match[1] . $match[3] . " [url]" . $match[2] . "[/url]");
1126                 }
1127         }
1128
1129         private static function cleanPictureLinksCallback($match)
1130         {
1131                 $a = DI::app();
1132
1133                 // When the picture link is the own photo path then we can avoid fetching the link
1134                 $own_photo_url = preg_quote(Strings::normaliseLink(DI::baseUrl()->get()) . '/photos/');
1135                 if (preg_match('|' . $own_photo_url . '.*?/image/|', Strings::normaliseLink($match[1]))) {
1136                         if (!empty($match[3])) {
1137                                 $text = '[img=' . str_replace('-1.', '-0.', $match[2]) . ']' . $match[3] . '[/img]';
1138                         } else {
1139                                 $text = '[img]' . str_replace('-1.', '-0.', $match[2]) . '[/img]';
1140                         }
1141                         return $text;
1142                 }
1143
1144                 $cache_key = 'clean:' . $match[1];
1145                 $text = DI::cache()->get($cache_key);
1146                 if (!is_null($text)) {
1147                         return $text;
1148                 }
1149
1150                 // Only fetch the header, not the content
1151                 $stamp1 = microtime(true);
1152
1153                 $ch = @curl_init($match[1]);
1154                 @curl_setopt($ch, CURLOPT_NOBODY, true);
1155                 @curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
1156                 @curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
1157                 @curl_exec($ch);
1158                 $curl_info = @curl_getinfo($ch);
1159
1160                 DI::profiler()->saveTimestamp($stamp1, "network", System::callstack());
1161
1162                 // if its a link to a picture then embed this picture
1163                 if (substr($curl_info['content_type'], 0, 6) == 'image/') {
1164                         $text = '[img]' . $match[1] . '[/img]';
1165                 } else {
1166                         if (!empty($match[3])) {
1167                                 $text = '[img=' . $match[2] . ']' . $match[3] . '[/img]';
1168                         } else {
1169                                 $text = '[img]' . $match[2] . '[/img]';
1170                         }
1171
1172                         // if its not a picture then look if its a page that contains a picture link
1173                         $body = Network::fetchUrl($match[1]);
1174
1175                         $doc = new DOMDocument();
1176                         @$doc->loadHTML($body);
1177                         $xpath = new DOMXPath($doc);
1178                         $list = $xpath->query("//meta[@name]");
1179                         foreach ($list as $node) {
1180                                 $attr = [];
1181                                 if ($node->attributes->length) {
1182                                         foreach ($node->attributes as $attribute) {
1183                                                 $attr[$attribute->name] = $attribute->value;
1184                                         }
1185                                 }
1186
1187                                 if (strtolower($attr['name']) == "twitter:image") {
1188                                         if (!empty($match[3])) {
1189                                                 $text = "[img=" . $attr['content'] . "]" . $match[3] . "[/img]";
1190                                         } else {
1191                                                 $text = "[img]" . $attr['content'] . "[/img]";
1192                                         }
1193                                 }
1194                         }
1195                 }
1196                 DI::cache()->set($cache_key, $text);
1197
1198                 return $text;
1199         }
1200
1201         public static function cleanPictureLinks($text)
1202         {
1203                 $return = preg_replace_callback("&\[url=([^\[\]]*)\]\[img=(.*)\](.*)\[\/img\]\[\/url\]&Usi", 'self::cleanPictureLinksCallback', $text);
1204                 $return = preg_replace_callback("&\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]&Usi", 'self::cleanPictureLinksCallback', $return);
1205                 return $return;
1206         }
1207
1208         /**
1209          * @brief Converts a BBCode message to HTML message
1210          *
1211          * BBcode 2 HTML was written by WAY2WEB.net
1212          * extended to work with Mistpark/Friendica - Mike Macgirvin
1213          *
1214          * Simple HTML values meaning:
1215          * - 0: Friendica display
1216          * - 1: Unused
1217          * - 2: Used for Windows Phone push, Friendica API
1218          * - 3: Used before converting to Markdown in bb2diaspora.php
1219          * - 4: Used for WordPress, Libertree (before Markdown), pump.io and tumblr
1220          * - 5: Unused
1221          * - 6: Unused
1222          * - 7: Used for dfrn, OStatus
1223          * - 8: Used for Twitter, WP backlink text setting
1224          * - 9: ActivityPub
1225          *
1226          * @param string $text
1227          * @param bool   $try_oembed
1228          * @param int    $simple_html
1229          * @param bool   $for_plaintext
1230          * @return string
1231          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1232          */
1233         public static function convert($text, $try_oembed = true, $simple_html = 0, $for_plaintext = false)
1234         {
1235                 $a = DI::app();
1236
1237                 /*
1238                  * preg_match_callback function to replace potential Oembed tags with Oembed content
1239                  *
1240                  * $match[0] = [tag]$url[/tag] or [tag=$url]$title[/tag]
1241                  * $match[1] = $url
1242                  * $match[2] = $title or absent
1243                  */
1244                 $try_oembed_callback = function ($match)
1245                 {
1246                         $url = $match[1];
1247                         $title = $match[2] ?? null;
1248
1249                         try {
1250                                 $return = OEmbed::getHTML($url, $title);
1251                         } catch (Exception $ex) {
1252                                 $return = $match[0];
1253                         }
1254
1255                         return $return;
1256                 };
1257
1258                 // Extracting code blocks before the whitespace processing and the autolinker
1259                 $codeblocks = [];
1260
1261                 $text = preg_replace_callback("#\[code(?:=([^\]]*))?\](.*?)\[\/code\]#ism",
1262                         function ($matches) use (&$codeblocks) {
1263                                 $return = '#codeblock-' . count($codeblocks) . '#';
1264                                 if (strpos($matches[2], "\n") !== false) {
1265                                         $codeblocks[] = '<pre><code class="language-' . trim($matches[1]) . '">' . htmlspecialchars(trim($matches[2], "\n\r"), ENT_NOQUOTES, 'UTF-8') . '</code></pre>';
1266                                 } else {
1267                                         $codeblocks[] = '<code>' . htmlspecialchars($matches[2], ENT_NOQUOTES, 'UTF-8') . '</code>';
1268                                 }
1269
1270                                 return $return;
1271                         },
1272                         $text
1273                 );
1274
1275                 // Hide all [noparse] contained bbtags by spacefying them
1276                 // POSSIBLE BUG --> Will the 'preg' functions crash if there's an embedded image?
1277
1278                 $text = preg_replace_callback("/\[noparse\](.*?)\[\/noparse\]/ism", 'self::escapeNoparseCallback', $text);
1279                 $text = preg_replace_callback("/\[nobb\](.*?)\[\/nobb\]/ism", 'self::escapeNoparseCallback', $text);
1280                 $text = preg_replace_callback("/\[pre\](.*?)\[\/pre\]/ism", 'self::escapeNoparseCallback', $text);
1281
1282                 // Remove the abstract element. It is a non visible element.
1283                 $text = self::stripAbstract($text);
1284
1285                 // Move all spaces out of the tags
1286                 $text = preg_replace("/\[(\w*)\](\s*)/ism", '$2[$1]', $text);
1287                 $text = preg_replace("/(\s*)\[\/(\w*)\]/ism", '[/$2]$1', $text);
1288
1289                 // Extract the private images which use data urls since preg has issues with
1290                 // large data sizes. Stash them away while we do bbcode conversion, and then put them back
1291                 // in after we've done all the regex matching. We cannot use any preg functions to do this.
1292
1293                 $extracted = self::extractImagesFromItemBody($text);
1294                 $text = $extracted['body'];
1295                 $saved_image = $extracted['images'];
1296
1297                 // If we find any event code, turn it into an event.
1298                 // After we're finished processing the bbcode we'll
1299                 // replace all of the event code with a reformatted version.
1300
1301                 $ev = Event::fromBBCode($text);
1302
1303                 // Replace any html brackets with HTML Entities to prevent executing HTML or script
1304                 // Don't use strip_tags here because it breaks [url] search by replacing & with amp
1305
1306                 $text = str_replace("<", "&lt;", $text);
1307                 $text = str_replace(">", "&gt;", $text);
1308
1309                 // remove some newlines before the general conversion
1310                 $text = preg_replace("/\s?\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "[share$1]$2[/share]", $text);
1311                 $text = preg_replace("/\s?\[quote(.*?)\]\s?(.*?)\s?\[\/quote\]\s?/ism", "[quote$1]$2[/quote]", $text);
1312
1313                 // when the content is meant exporting to other systems then remove the avatar picture since this doesn't really look good on these systems
1314                 if (!$try_oembed) {
1315                         $text = preg_replace("/\[share(.*?)avatar\s?=\s?'.*?'\s?(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "\n[share$1$2]$3[/share]", $text);
1316                 }
1317
1318                 // Convert new line chars to html <br /> tags
1319
1320                 // nlbr seems to be hopelessly messed up
1321                 //      $Text = nl2br($Text);
1322
1323                 // We'll emulate it.
1324
1325                 $text = trim($text);
1326                 $text = str_replace("\r\n", "\n", $text);
1327
1328                 // Remove linefeeds inside of the table elements. See issue #6799
1329                 $search = ["\n[th]", "[th]\n", " [th]", "\n[/th]", "[/th]\n", "[/th] ",
1330                         "\n[td]", "[td]\n", " [td]", "\n[/td]", "[/td]\n", "[/td] ",
1331                         "\n[tr]", "[tr]\n", " [tr]", "[tr] ", "\n[/tr]", "[/tr]\n", " [/tr]", "[/tr] ",
1332                         "[table]\n", "[table] ", " [table]", "\n[/table]", " [/table]", "[/table] "];
1333                 $replace = ["[th]", "[th]", "[th]", "[/th]", "[/th]", "[/th]",
1334                         "[td]", "[td]", "[td]", "[/td]", "[/td]", "[/td]",
1335                         "[tr]", "[tr]", "[tr]", "[tr]", "[/tr]", "[/tr]", "[/tr]", "[/tr]",
1336                         "[table]", "[table]", "[table]", "[/table]", "[/table]", "[/table]"];
1337                 do {
1338                         $oldtext = $text;
1339                         $text = str_replace($search, $replace, $text);
1340                 } while ($oldtext != $text);
1341
1342                 // Replace these here only once
1343                 $search = ["\n[table]", "[/table]\n"];
1344                 $replace = ["[table]", "[/table]"];
1345                 $text = str_replace($search, $replace, $text);
1346
1347                 // removing multiplicated newlines
1348                 if (Config::get('system', 'remove_multiplicated_lines')) {
1349                         $search = ["\n\n\n", "\n ", " \n", "[/quote]\n\n", "\n[/quote]", "[/li]\n", "\n[li]", "\n[ul]", "[/ul]\n", "\n\n[share ", "[/attachment]\n",
1350                                         "\n[h1]", "[/h1]\n", "\n[h2]", "[/h2]\n", "\n[h3]", "[/h3]\n", "\n[h4]", "[/h4]\n", "\n[h5]", "[/h5]\n", "\n[h6]", "[/h6]\n"];
1351                         $replace = ["\n\n", "\n", "\n", "[/quote]\n", "[/quote]", "[/li]", "[li]", "[ul]", "[/ul]", "\n[share ", "[/attachment]",
1352                                         "[h1]", "[/h1]", "[h2]", "[/h2]", "[h3]", "[/h3]", "[h4]", "[/h4]", "[h5]", "[/h5]", "[h6]", "[/h6]"];
1353                         do {
1354                                 $oldtext = $text;
1355                                 $text = str_replace($search, $replace, $text);
1356                         } while ($oldtext != $text);
1357                 }
1358
1359                 /// @todo Have a closer look at the different html modes
1360                 // Handle attached links or videos
1361                 if (in_array($simple_html, [9])) {
1362                         $text = self::removeAttachment($text);
1363                 } elseif (!in_array($simple_html, [0, 4])) {
1364                         $text = self::removeAttachment($text, true);
1365                 } else {
1366                         $text = self::convertAttachment($text, $simple_html, $try_oembed);
1367                 }
1368
1369                 // leave open the posibility of [map=something]
1370                 // this is replaced in Item::prepareBody() which has knowledge of the item location
1371                 if (strpos($text, '[/map]') !== false) {
1372                         $text = preg_replace_callback(
1373                                 "/\[map\](.*?)\[\/map\]/ism",
1374                                 function ($match) use ($simple_html) {
1375                                         return str_replace($match[0], '<p class="map">' . Map::byLocation($match[1], $simple_html) . '</p>', $match[0]);
1376                                 },
1377                                 $text
1378                         );
1379                 }
1380
1381                 if (strpos($text, '[map=') !== false) {
1382                         $text = preg_replace_callback(
1383                                 "/\[map=(.*?)\]/ism",
1384                                 function ($match) use ($simple_html) {
1385                                         return str_replace($match[0], '<p class="map">' . Map::byCoordinates(str_replace('/', ' ', $match[1]), $simple_html) . '</p>', $match[0]);
1386                                 },
1387                                 $text
1388                         );
1389                 }
1390
1391                 if (strpos($text, '[map]') !== false) {
1392                         $text = preg_replace("/\[map\]/", '<p class="map"></p>', $text);
1393                 }
1394
1395                 // Check for headers
1396                 $text = preg_replace("(\[h1\](.*?)\[\/h1\])ism", '<h1>$1</h1>', $text);
1397                 $text = preg_replace("(\[h2\](.*?)\[\/h2\])ism", '<h2>$1</h2>', $text);
1398                 $text = preg_replace("(\[h3\](.*?)\[\/h3\])ism", '<h3>$1</h3>', $text);
1399                 $text = preg_replace("(\[h4\](.*?)\[\/h4\])ism", '<h4>$1</h4>', $text);
1400                 $text = preg_replace("(\[h5\](.*?)\[\/h5\])ism", '<h5>$1</h5>', $text);
1401                 $text = preg_replace("(\[h6\](.*?)\[\/h6\])ism", '<h6>$1</h6>', $text);
1402
1403                 // Check for paragraph
1404                 $text = preg_replace("(\[p\](.*?)\[\/p\])ism", '<p>$1</p>', $text);
1405
1406                 // Check for bold text
1407                 $text = preg_replace("(\[b\](.*?)\[\/b\])ism", '<strong>$1</strong>', $text);
1408
1409                 // Check for Italics text
1410                 $text = preg_replace("(\[i\](.*?)\[\/i\])ism", '<em>$1</em>', $text);
1411
1412                 // Check for Underline text
1413                 $text = preg_replace("(\[u\](.*?)\[\/u\])ism", '<u>$1</u>', $text);
1414
1415                 // Check for strike-through text
1416                 $text = preg_replace("(\[s\](.*?)\[\/s\])ism", '<s>$1</s>', $text);
1417
1418                 // Check for over-line text
1419                 $text = preg_replace("(\[o\](.*?)\[\/o\])ism", '<span class="overline">$1</span>', $text);
1420
1421                 // Check for colored text
1422                 $text = preg_replace("(\[color=(.*?)\](.*?)\[\/color\])ism", "<span style=\"color: $1;\">$2</span>", $text);
1423
1424                 // Check for sized text
1425                 // [size=50] --> font-size: 50px (with the unit).
1426                 if ($simple_html != 3) {
1427                         $text = preg_replace("(\[size=(\d*?)\](.*?)\[\/size\])ism", "<span style=\"font-size: $1px; line-height: initial;\">$2</span>", $text);
1428                         $text = preg_replace("(\[size=(.*?)\](.*?)\[\/size\])ism", "<span style=\"font-size: $1; line-height: initial;\">$2</span>", $text);
1429                 } else {
1430                         // Issue 2199: Diaspora doesn't interpret the construct above, nor the <small> or <big> element
1431                         $text = preg_replace("(\[size=(.*?)\](.*?)\[\/size\])ism", "$2", $text);
1432                 }
1433
1434
1435                 // Check for centered text
1436                 $text = preg_replace("(\[center\](.*?)\[\/center\])ism", "<div style=\"text-align:center;\">$1</div>", $text);
1437
1438                 // Check for list text
1439                 $text = str_replace("[*]", "<li>", $text);
1440
1441                 // Check for style sheet commands
1442                 $text = preg_replace_callback(
1443                         "(\[style=(.*?)\](.*?)\[\/style\])ism",
1444                         function ($match) {
1445                                 return "<span style=\"" . HTML::sanitizeCSS($match[1]) . ";\">" . $match[2] . "</span>";
1446                         },
1447                         $text
1448                 );
1449
1450                 // Check for CSS classes
1451                 $text = preg_replace_callback(
1452                         "(\[class=(.*?)\](.*?)\[\/class\])ism",
1453                         function ($match) {
1454                                 return "<span class=\"" . HTML::sanitizeCSS($match[1]) . "\">" . $match[2] . "</span>";
1455                         },
1456                         $text
1457                 );
1458
1459                 // handle nested lists
1460                 $endlessloop = 0;
1461
1462                 while ((((strpos($text, "[/list]") !== false) && (strpos($text, "[list") !== false)) ||
1463                                 ((strpos($text, "[/ol]") !== false) && (strpos($text, "[ol]") !== false)) ||
1464                                 ((strpos($text, "[/ul]") !== false) && (strpos($text, "[ul]") !== false)) ||
1465                                 ((strpos($text, "[/li]") !== false) && (strpos($text, "[li]") !== false))) && (++$endlessloop < 20)) {
1466                         $text = preg_replace("/\[list\](.*?)\[\/list\]/ism", '<ul class="listbullet" style="list-style-type: circle;">$1</ul>', $text);
1467                         $text = preg_replace("/\[list=\](.*?)\[\/list\]/ism", '<ul class="listnone" style="list-style-type: none;">$1</ul>', $text);
1468                         $text = preg_replace("/\[list=1\](.*?)\[\/list\]/ism", '<ul class="listdecimal" style="list-style-type: decimal;">$1</ul>', $text);
1469                         $text = preg_replace("/\[list=((?-i)i)\](.*?)\[\/list\]/ism", '<ul class="listlowerroman" style="list-style-type: lower-roman;">$2</ul>', $text);
1470                         $text = preg_replace("/\[list=((?-i)I)\](.*?)\[\/list\]/ism", '<ul class="listupperroman" style="list-style-type: upper-roman;">$2</ul>', $text);
1471                         $text = preg_replace("/\[list=((?-i)a)\](.*?)\[\/list\]/ism", '<ul class="listloweralpha" style="list-style-type: lower-alpha;">$2</ul>', $text);
1472                         $text = preg_replace("/\[list=((?-i)A)\](.*?)\[\/list\]/ism", '<ul class="listupperalpha" style="list-style-type: upper-alpha;">$2</ul>', $text);
1473                         $text = preg_replace("/\[ul\](.*?)\[\/ul\]/ism", '<ul class="listbullet" style="list-style-type: circle;">$1</ul>', $text);
1474                         $text = preg_replace("/\[ol\](.*?)\[\/ol\]/ism", '<ul class="listdecimal" style="list-style-type: decimal;">$1</ul>', $text);
1475                         $text = preg_replace("/\[li\](.*?)\[\/li\]/ism", '<li>$1</li>', $text);
1476                 }
1477
1478                 $text = preg_replace("/\[th\](.*?)\[\/th\]/sm", '<th>$1</th>', $text);
1479                 $text = preg_replace("/\[td\](.*?)\[\/td\]/sm", '<td>$1</td>', $text);
1480                 $text = preg_replace("/\[tr\](.*?)\[\/tr\]/sm", '<tr>$1</tr>', $text);
1481                 $text = preg_replace("/\[table\](.*?)\[\/table\]/sm", '<table>$1</table>', $text);
1482
1483                 $text = preg_replace("/\[table border=1\](.*?)\[\/table\]/sm", '<table border="1" >$1</table>', $text);
1484                 $text = preg_replace("/\[table border=0\](.*?)\[\/table\]/sm", '<table border="0" >$1</table>', $text);
1485
1486                 $text = str_replace('[hr]', '<hr />', $text);
1487
1488                 if (!$for_plaintext) {
1489                         $escaped = [];
1490
1491                         // Escaping BBCodes susceptible to contain rogue URL we don'' want the autolinker to catch
1492                         $text = preg_replace_callback('#\[(url|img|audio|video|youtube|vimeo|share|attachment|iframe|bookmark).+?\[/\1\]#ism',
1493                                 function ($matches) use (&$escaped) {
1494                                         $return = '{escaped-' . count($escaped) . '}';
1495                                         $escaped[] = $matches[0];
1496
1497                                         return $return;
1498                                 },
1499                                 $text
1500                         );
1501
1502                         // Autolinker for isolated URLs
1503                         $text = preg_replace(Strings::autoLinkRegEx(), '[url]$1[/url]', $text);
1504
1505                         // Restoring escaped blocks
1506                         $text = preg_replace_callback('/{escaped-([0-9]+)}/iU',
1507                                 function ($matches) use ($escaped) {
1508                                         return $escaped[intval($matches[1])] ?? $matches[0];
1509                                 },
1510                                 $text
1511                         );
1512                 }
1513
1514                 // This is actually executed in Item::prepareBody()
1515
1516                 $nosmile = strpos($text, '[nosmile]') !== false;
1517                 $text = str_replace('[nosmile]', '', $text);
1518
1519                 // Check for font change text
1520                 $text = preg_replace("/\[font=(.*?)\](.*?)\[\/font\]/sm", "<span style=\"font-family: $1;\">$2</span>", $text);
1521
1522                 // Declare the format for [spoiler] layout
1523                 $SpoilerLayout = '<details class="spoiler"><summary>' . L10n::t('Click to open/close') . '</summary>$1</details>';
1524
1525                 // Check for [spoiler] text
1526                 // handle nested quotes
1527                 $endlessloop = 0;
1528                 while ((strpos($text, "[/spoiler]") !== false) && (strpos($text, "[spoiler]") !== false) && (++$endlessloop < 20)) {
1529                         $text = preg_replace("/\[spoiler\](.*?)\[\/spoiler\]/ism", $SpoilerLayout, $text);
1530                 }
1531
1532                 // Check for [spoiler=Title] text
1533
1534                 // handle nested quotes
1535                 $endlessloop = 0;
1536                 while ((strpos($text, "[/spoiler]")!== false)  && (strpos($text, "[spoiler=") !== false) && (++$endlessloop < 20)) {
1537                         $text = preg_replace("/\[spoiler=[\"\']*(.*?)[\"\']*\](.*?)\[\/spoiler\]/ism",
1538                                 '<details class="spoiler"><summary>$1</summary>$2</details>',
1539                                 $text);
1540                 }
1541
1542                 // Declare the format for [quote] layout
1543                 $QuoteLayout = '<blockquote>$1</blockquote>';
1544
1545                 // Check for [quote] text
1546                 // handle nested quotes
1547                 $endlessloop = 0;
1548                 while ((strpos($text, "[/quote]") !== false) && (strpos($text, "[quote]") !== false) && (++$endlessloop < 20)) {
1549                         $text = preg_replace("/\[quote\](.*?)\[\/quote\]/ism", "$QuoteLayout", $text);
1550                 }
1551
1552                 // Check for [quote=Author] text
1553
1554                 $t_wrote = L10n::t('$1 wrote:');
1555
1556                 // handle nested quotes
1557                 $endlessloop = 0;
1558                 while ((strpos($text, "[/quote]")!== false)  && (strpos($text, "[quote=") !== false) && (++$endlessloop < 20)) {
1559                         $text = preg_replace("/\[quote=[\"\']*(.*?)[\"\']*\](.*?)\[\/quote\]/ism",
1560                                 "<p><strong class=".'"author"'.">" . $t_wrote . "</strong></p><blockquote>$2</blockquote>",
1561                                 $text);
1562                 }
1563
1564
1565                 // [img=widthxheight]image source[/img]
1566                 $text = preg_replace_callback(
1567                         "/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism",
1568                         function ($matches) use ($simple_html) {
1569                                 if (strpos($matches[3], "data:image/") === 0) {
1570                                         return $matches[0];
1571                                 }
1572
1573                                 $matches[3] = self::proxyUrl($matches[3], $simple_html);
1574                                 return "[img=" . $matches[1] . "x" . $matches[2] . "]" . $matches[3] . "[/img]";
1575                         },
1576                         $text
1577                 );
1578
1579                 $text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '<img src="$3" style="width: $1px;" >', $text);
1580                 $text = preg_replace("/\[zmg\=([0-9]*)x([0-9]*)\](.*?)\[\/zmg\]/ism", '<img class="zrl" src="$3" style="width: $1px;" >', $text);
1581
1582                 $text = preg_replace_callback("/\[img\=(.*?)\](.*?)\[\/img\]/ism",
1583                         function ($matches) use ($simple_html) {
1584                                 $matches[1] = self::proxyUrl($matches[1], $simple_html);
1585                                 $matches[2] = htmlspecialchars($matches[2], ENT_COMPAT);
1586                                 return '<img src="' . $matches[1] . '" alt="' . $matches[2] . '" title="' . $matches[2] . '">';
1587                         },
1588                         $text);
1589
1590                 // Images
1591                 // [img]pathtoimage[/img]
1592                 $text = preg_replace_callback(
1593                         "/\[img\](.*?)\[\/img\]/ism",
1594                         function ($matches) use ($simple_html) {
1595                                 if (strpos($matches[1], "data:image/") === 0) {
1596                                         return $matches[0];
1597                                 }
1598
1599                                 $matches[1] = self::proxyUrl($matches[1], $simple_html);
1600                                 return "[img]" . $matches[1] . "[/img]";
1601                         },
1602                         $text
1603                 );
1604
1605                 $text = preg_replace("/\[img\](.*?)\[\/img\]/ism", '<img src="$1" alt="' . L10n::t('Image/photo') . '" />', $text);
1606                 $text = preg_replace("/\[zmg\](.*?)\[\/zmg\]/ism", '<img src="$1" alt="' . L10n::t('Image/photo') . '" />', $text);
1607
1608                 $text = preg_replace("/\[crypt\](.*?)\[\/crypt\]/ism", '<br/><img src="' .DI::baseUrl() . '/images/lock_icon.gif" alt="' . L10n::t('Encrypted content') . '" title="' . L10n::t('Encrypted content') . '" /><br />', $text);
1609                 $text = preg_replace("/\[crypt(.*?)\](.*?)\[\/crypt\]/ism", '<br/><img src="' .DI::baseUrl() . '/images/lock_icon.gif" alt="' . L10n::t('Encrypted content') . '" title="' . '$1' . ' ' . L10n::t('Encrypted content') . '" /><br />', $text);
1610                 //$Text = preg_replace("/\[crypt=(.*?)\](.*?)\[\/crypt\]/ism", '<br/><img src="' .DI::baseUrl() . '/images/lock_icon.gif" alt="' . L10n::t('Encrypted content') . '" title="' . '$1' . ' ' . L10n::t('Encrypted content') . '" /><br />', $Text);
1611
1612                 // Simplify "video" element
1613                 $text = preg_replace('(\[video.*?\ssrc\s?=\s?([^\s\]]+).*?\].*?\[/video\])ism', '[video]$1[/video]', $text);
1614
1615                 // Try to Oembed
1616                 if ($try_oembed) {
1617                         $text = preg_replace("/\[video\](.*?\.(ogg|ogv|oga|ogm|webm|mp4).*?)\[\/video\]/ism", '<video src="$1" controls="controls" width="' . $a->videowidth . '" height="' . $a->videoheight . '" loop="true"><a href="$1">$1</a></video>', $text);
1618                         $text = preg_replace("/\[audio\](.*?\.(ogg|ogv|oga|ogm|webm|mp4|mp3).*?)\[\/audio\]/ism", '<audio src="$1" controls="controls"><a href="$1">$1</a></audio>', $text);
1619
1620                         $text = preg_replace_callback("/\[video\](.*?)\[\/video\]/ism", $try_oembed_callback, $text);
1621                         $text = preg_replace_callback("/\[audio\](.*?)\[\/audio\]/ism", $try_oembed_callback, $text);
1622                 } else {
1623                         $text = preg_replace("/\[video\](.*?)\[\/video\]/ism",
1624                                 '<a href="$1" target="_blank">$1</a>', $text);
1625                         $text = preg_replace("/\[audio\](.*?)\[\/audio\]/ism",
1626                                 '<a href="$1" target="_blank">$1</a>', $text);
1627                 }
1628
1629                 // html5 video and audio
1630
1631
1632                 if ($try_oembed) {
1633                         $text = preg_replace("/\[iframe\](.*?)\[\/iframe\]/ism", '<iframe src="$1" width="' . $a->videowidth . '" height="' . $a->videoheight . '"><a href="$1">$1</a></iframe>', $text);
1634                 } else {
1635                         $text = preg_replace("/\[iframe\](.*?)\[\/iframe\]/ism", '<a href="$1">$1</a>', $text);
1636                 }
1637
1638                 // Youtube extensions
1639                 if ($try_oembed) {
1640                         $text = preg_replace_callback("/\[youtube\](https?:\/\/www.youtube.com\/watch\?v\=.*?)\[\/youtube\]/ism", $try_oembed_callback, $text);
1641                         $text = preg_replace_callback("/\[youtube\](www.youtube.com\/watch\?v\=.*?)\[\/youtube\]/ism", $try_oembed_callback, $text);
1642                         $text = preg_replace_callback("/\[youtube\](https?:\/\/youtu.be\/.*?)\[\/youtube\]/ism", $try_oembed_callback, $text);
1643                 }
1644
1645                 $text = preg_replace("/\[youtube\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/youtube\]/ism", '[youtube]$1[/youtube]', $text);
1646                 $text = preg_replace("/\[youtube\]https?:\/\/www.youtube.com\/embed\/(.*?)\[\/youtube\]/ism", '[youtube]$1[/youtube]', $text);
1647                 $text = preg_replace("/\[youtube\]https?:\/\/youtu.be\/(.*?)\[\/youtube\]/ism", '[youtube]$1[/youtube]', $text);
1648
1649                 if ($try_oembed) {
1650                         $text = preg_replace("/\[youtube\]([A-Za-z0-9\-_=]+)(.*?)\[\/youtube\]/ism", '<iframe width="' . $a->videowidth . '" height="' . $a->videoheight . '" src="https://www.youtube.com/embed/$1" frameborder="0" ></iframe>', $text);
1651                 } else {
1652                         $text = preg_replace("/\[youtube\]([A-Za-z0-9\-_=]+)(.*?)\[\/youtube\]/ism",
1653                                 '<a href="https://www.youtube.com/watch?v=$1" target="_blank">https://www.youtube.com/watch?v=$1</a>', $text);
1654                 }
1655
1656                 if ($try_oembed) {
1657                         $text = preg_replace_callback("/\[vimeo\](https?:\/\/player.vimeo.com\/video\/[0-9]+).*?\[\/vimeo\]/ism", $try_oembed_callback, $text);
1658                         $text = preg_replace_callback("/\[vimeo\](https?:\/\/vimeo.com\/[0-9]+).*?\[\/vimeo\]/ism", $try_oembed_callback, $text);
1659                 }
1660
1661                 $text = preg_replace("/\[vimeo\]https?:\/\/player.vimeo.com\/video\/([0-9]+)(.*?)\[\/vimeo\]/ism", '[vimeo]$1[/vimeo]', $text);
1662                 $text = preg_replace("/\[vimeo\]https?:\/\/vimeo.com\/([0-9]+)(.*?)\[\/vimeo\]/ism", '[vimeo]$1[/vimeo]', $text);
1663
1664                 if ($try_oembed) {
1665                         $text = preg_replace("/\[vimeo\]([0-9]+)(.*?)\[\/vimeo\]/ism", '<iframe width="' . $a->videowidth . '" height="' . $a->videoheight . '" src="https://player.vimeo.com/video/$1" frameborder="0" ></iframe>', $text);
1666                 } else {
1667                         $text = preg_replace("/\[vimeo\]([0-9]+)(.*?)\[\/vimeo\]/ism",
1668                                 '<a href="https://vimeo.com/$1" target="_blank">https://vimeo.com/$1</a>', $text);
1669                 }
1670
1671                 // oembed tag
1672                 $text = OEmbed::BBCode2HTML($text);
1673
1674                 // Avoid triple linefeeds through oembed
1675                 $text = str_replace("<br style='clear:left'></span><br /><br />", "<br style='clear:left'></span><br />", $text);
1676
1677                 // If we found an event earlier, strip out all the event code and replace with a reformatted version.
1678                 // Replace the event-start section with the entire formatted event. The other bbcode is stripped.
1679                 // Summary (e.g. title) is required, earlier revisions only required description (in addition to
1680                 // start which is always required). Allow desc with a missing summary for compatibility.
1681
1682                 if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
1683                         $sub = Event::getHTML($ev, $simple_html);
1684
1685                         $text = preg_replace("/\[event\-summary\](.*?)\[\/event\-summary\]/ism", '', $text);
1686                         $text = preg_replace("/\[event\-description\](.*?)\[\/event\-description\]/ism", '', $text);
1687                         $text = preg_replace("/\[event\-start\](.*?)\[\/event\-start\]/ism", $sub, $text);
1688                         $text = preg_replace("/\[event\-finish\](.*?)\[\/event\-finish\]/ism", '', $text);
1689                         $text = preg_replace("/\[event\-location\](.*?)\[\/event\-location\]/ism", '', $text);
1690                         $text = preg_replace("/\[event\-adjust\](.*?)\[\/event\-adjust\]/ism", '', $text);
1691                         $text = preg_replace("/\[event\-id\](.*?)\[\/event\-id\]/ism", '', $text);
1692                 }
1693
1694                 // Replace non graphical smilies for external posts
1695                 if (!$nosmile && !$for_plaintext) {
1696                         $text = Smilies::replace($text);
1697                 }
1698
1699                 if (!$for_plaintext) {
1700                         if (in_array($simple_html, [7, 9])) {
1701                                 $text = preg_replace_callback("/\[url\](.*?)\[\/url\]/ism", 'self::convertUrlForActivityPubCallback', $text);
1702                                 $text = preg_replace_callback("/\[url\=(.*?)\](.*?)\[\/url\]/ism", 'self::convertUrlForActivityPubCallback', $text);
1703                         }
1704                 } else {
1705                         $text = preg_replace("(\[url\](.*?)\[\/url\])ism", " $1 ", $text);
1706                         $text = preg_replace_callback("&\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]&Usi", 'self::removePictureLinksCallback', $text);
1707                 }
1708
1709                 $text = str_replace(["\r","\n"], ['<br />', '<br />'], $text);
1710
1711                 // Remove all hashtag addresses
1712                 if ($simple_html && !in_array($simple_html, [3, 7, 9])) {
1713                         $text = preg_replace("/([#@!])\[url\=(.*?)\](.*?)\[\/url\]/ism", '$1$3', $text);
1714                 } elseif ($simple_html == 3) {
1715                         // The ! is converted to @ since Diaspora only understands the @
1716                         $text = preg_replace("/([@!])\[url\=(.*?)\](.*?)\[\/url\]/ism",
1717                                 '@<a href="$2">$3</a>',
1718                                 $text);
1719                 } elseif (in_array($simple_html, [7, 9])) {
1720                         $text = preg_replace("/([@!])\[url\=(.*?)\](.*?)\[\/url\]/ism",
1721                                 '$1<span class="vcard"><a href="$2" class="url u-url mention" title="$3"><span class="fn nickname mention">$3</span></a></span>',
1722                                 $text);
1723                 } elseif (!$simple_html) {
1724                         $text = preg_replace("/([@!])\[url\=(.*?)\](.*?)\[\/url\]/ism",
1725                                 '$1<a href="$2" class="userinfo mention" title="$3">$3</a>',
1726                                 $text);
1727                 }
1728
1729                 // Bookmarks in red - will be converted to bookmarks in friendica
1730                 $text = preg_replace("/#\^\[url\](.*?)\[\/url\]/ism", '[bookmark=$1]$1[/bookmark]', $text);
1731                 $text = preg_replace("/#\^\[url\=(.*?)\](.*?)\[\/url\]/ism", '[bookmark=$1]$2[/bookmark]', $text);
1732                 $text = preg_replace("/#\[url\=.*?\]\^\[\/url\]\[url\=(.*?)\](.*?)\[\/url\]/i",
1733                                         "[bookmark=$1]$2[/bookmark]", $text);
1734
1735                 if (in_array($simple_html, [2, 6, 7, 8])) {
1736                         $text = preg_replace_callback("/([^#@!])\[url\=([^\]]*)\](.*?)\[\/url\]/ism", "self::expandLinksCallback", $text);
1737                         //$Text = preg_replace("/[^#@!]\[url\=([^\]]*)\](.*?)\[\/url\]/ism", ' $2 [url]$1[/url]', $Text);
1738                         $text = preg_replace("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", ' $2 [url]$1[/url]',$text);
1739                 }
1740
1741                 if ($simple_html == 5) {
1742                         $text = preg_replace("/[^#@!]\[url\=(.*?)\](.*?)\[\/url\]/ism", '[url]$1[/url]', $text);
1743                 }
1744
1745                 // Perform URL Search
1746                 if ($try_oembed) {
1747                         $text = preg_replace_callback("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", $try_oembed_callback, $text);
1748                 }
1749
1750                 if ($simple_html == 5) {
1751                         $text = preg_replace("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", '[url]$1[/url]', $text);
1752                 } else {
1753                         $text = preg_replace("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", '[url=$1]$2[/url]', $text);
1754                 }
1755
1756                 // Handle Diaspora posts
1757                 $text = preg_replace_callback(
1758                         "&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1759                         function ($match) {
1760                                 return "[url=" . DI::baseUrl() . "/display/" . $match[1] . "]" . $match[2] . "[/url]";
1761                         }, $text
1762                 );
1763
1764                 $text = preg_replace_callback(
1765                         "&\[url=/people\?q\=(.*)\](.*)\[\/url\]&Usi",
1766                         function ($match) {
1767                                 return "[url=" . DI::baseUrl() . "/search?search=%40" . $match[1] . "]" . $match[2] . "[/url]";
1768                         }, $text
1769                 );
1770
1771                 // Server independent link to posts and comments
1772                 // See issue: https://github.com/diaspora/diaspora_federation/issues/75
1773                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1774                 $text = preg_replace($expression, DI::baseUrl()."/display/$1", $text);
1775
1776                 /* Tag conversion
1777                  * Supports:
1778                  * - #[url=<anything>]<term>[/url]
1779                  * - [url=<anything>]#<term>[/url]
1780                  */
1781                 $text = preg_replace_callback("/(?:#\[url\=[^\[\]]*\]|\[url\=[^\[\]]*\]#)(.*?)\[\/url\]/ism", function($matches) {
1782                         return '#<a href="'
1783                                 . DI::baseUrl() . '/search?tag=' . rawurlencode($matches[1])
1784                                 . '" class="tag" rel="tag" title="' . XML::escape($matches[1]) . '">'
1785                                 . XML::escape($matches[1])
1786                                 . '</a>';
1787                 }, $text);
1788
1789                 // We need no target="_blank" for local links
1790                 // convert links start with DI::baseUrl() as local link without the target="_blank" attribute
1791                 $escapedBaseUrl = preg_quote(DI::baseUrl(), '/');
1792                 $text = preg_replace("/\[url\](".$escapedBaseUrl.".*?)\[\/url\]/ism", '<a href="$1">$1</a>', $text);
1793                 $text = preg_replace("/\[url\=(".$escapedBaseUrl.".*?)\](.*?)\[\/url\]/ism", '<a href="$1">$2</a>', $text);
1794
1795                 $text = preg_replace("/\[url\](.*?)\[\/url\]/ism", '<a href="$1" target="_blank">$1</a>', $text);
1796                 $text = preg_replace("/\[url\=(.*?)\](.*?)\[\/url\]/ism", '<a href="$1" target="_blank">$2</a>', $text);
1797
1798                 // Red compatibility, though the link can't be authenticated on Friendica
1799                 $text = preg_replace("/\[zrl\=(.*?)\](.*?)\[\/zrl\]/ism", '<a href="$1" target="_blank">$2</a>', $text);
1800
1801
1802                 // we may need to restrict this further if it picks up too many strays
1803                 // link acct:user@host to a webfinger profile redirector
1804
1805                 $text = preg_replace('/acct:([^@]+)@((?!\-)(?:[a-zA-Z\d\-]{0,62}[a-zA-Z\d]\.){1,126}(?!\d+)[a-zA-Z\d]{1,63})/', '<a href="' . DI::baseUrl() . '/acctlink?addr=$1@$2" target="extlink">acct:$1@$2</a>', $text);
1806
1807                 // Perform MAIL Search
1808                 $text = preg_replace("/\[mail\](.*?)\[\/mail\]/", '<a href="mailto:$1">$1</a>', $text);
1809                 $text = preg_replace("/\[mail\=(.*?)\](.*?)\[\/mail\]/", '<a href="mailto:$1">$2</a>', $text);
1810
1811                 // Unhide all [noparse] contained bbtags unspacefying them
1812                 // and triming the [noparse] tag.
1813
1814                 $text = preg_replace_callback("/\[noparse\](.*?)\[\/noparse\]/ism", 'self::unescapeNoparseCallback', $text);
1815                 $text = preg_replace_callback("/\[nobb\](.*?)\[\/nobb\]/ism", 'self::unescapeNoparseCallback', $text);
1816                 $text = preg_replace_callback("/\[pre\](.*?)\[\/pre\]/ism", 'self::unescapeNoparseCallback', $text);
1817
1818                 /// @todo What is the meaning of these lines?
1819                 $text = preg_replace('/\[\&amp\;([#a-z0-9]+)\;\]/', '&$1;', $text);
1820                 $text = preg_replace('/\&\#039\;/', '\'', $text);
1821
1822                 // Currently deactivated, it made problems with " inside of alt texts.
1823                 //$text = preg_replace('/\&quot\;/', '"', $text);
1824
1825                 // fix any escaped ampersands that may have been converted into links
1826                 $text = preg_replace('/\<([^>]*?)(src|href)=(.*?)\&amp\;(.*?)\>/ism', '<$1$2=$3&$4>', $text);
1827
1828                 // sanitizes src attributes (http and redir URLs for displaying in a web page, cid used for inline images in emails)
1829                 $allowed_src_protocols = ['//', 'http://', 'https://', 'redir/', 'cid:'];
1830
1831                 array_walk($allowed_src_protocols, function(&$value) { $value = preg_quote($value, '#');});
1832
1833                 $text = preg_replace('#<([^>]*?)(src)="(?!' . implode('|', $allowed_src_protocols) . ')(.*?)"(.*?)>#ism',
1834                                          '<$1$2=""$4 data-original-src="$3" class="invalid-src" title="' . L10n::t('Invalid source protocol') . '">', $text);
1835
1836                 // sanitize href attributes (only whitelisted protocols URLs)
1837                 // default value for backward compatibility
1838                 $allowed_link_protocols = Config::get('system', 'allowed_link_protocols', []);
1839
1840                 // Always allowed protocol even if config isn't set or not including it
1841                 $allowed_link_protocols[] = '//';
1842                 $allowed_link_protocols[] = 'http://';
1843                 $allowed_link_protocols[] = 'https://';
1844                 $allowed_link_protocols[] = 'redir/';
1845
1846                 array_walk($allowed_link_protocols, function(&$value) { $value = preg_quote($value, '#');});
1847
1848                 $regex = '#<([^>]*?)(href)="(?!' . implode('|', $allowed_link_protocols) . ')(.*?)"(.*?)>#ism';
1849                 $text = preg_replace($regex, '<$1$2="javascript:void(0)"$4 data-original-href="$3" class="invalid-href" title="' . L10n::t('Invalid link protocol') . '">', $text);
1850
1851                 // Shared content
1852                 $text = self::convertShare(
1853                         $text,
1854                         function (array $attributes, array $author_contact, $content, $is_quote_share) use ($simple_html) {
1855                                 return self::convertShareCallback($attributes, $author_contact, $content, $is_quote_share, $simple_html);
1856                         }
1857                 );
1858
1859                 if ($saved_image) {
1860                         $text = self::interpolateSavedImagesIntoItemBody($text, $saved_image);
1861                 }
1862
1863                 // Restore code blocks
1864                 $text = preg_replace_callback('/#codeblock-([0-9]+)#/iU',
1865                         function ($matches) use ($codeblocks) {
1866                                 $return = $matches[0];
1867                                 if (isset($codeblocks[intval($matches[1])])) {
1868                                         $return = $codeblocks[$matches[1]];
1869                                 }
1870                                 return $return;
1871                         },
1872                         $text
1873                 );
1874
1875                 // Clean up the HTML by loading and saving the HTML with the DOM.
1876                 // Bad structured html can break a whole page.
1877                 // For performance reasons do it only with activated item cache or at export.
1878                 if (!$try_oembed || (get_itemcachepath() != '')) {
1879                         $doc = new DOMDocument();
1880                         $doc->preserveWhiteSpace = false;
1881
1882                         $text = mb_convert_encoding($text, 'HTML-ENTITIES', "UTF-8");
1883
1884                         $doctype = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">';
1885                         $encoding = '<?xml encoding="UTF-8">';
1886                         @$doc->loadHTML($encoding . $doctype . '<html><body>' . $text . '</body></html>');
1887                         $doc->encoding = 'UTF-8';
1888                         $text = $doc->saveHTML();
1889                         $text = str_replace(['<html><body>', '</body></html>', $doctype, $encoding], ['', '', '', ''], $text);
1890
1891                         $text = str_replace('<br></li>', '</li>', $text);
1892
1893                         //$Text = mb_convert_encoding($Text, "UTF-8", 'HTML-ENTITIES');
1894                 }
1895
1896                 // Clean up some useless linebreaks in lists
1897                 //$Text = str_replace('<br /><ul', '<ul ', $Text);
1898                 //$Text = str_replace('</ul><br />', '</ul>', $Text);
1899                 //$Text = str_replace('</li><br />', '</li>', $Text);
1900                 //$Text = str_replace('<br /><li>', '<li>', $Text);
1901                 //$Text = str_replace('<br /><ul', '<ul ', $Text);
1902
1903                 Hook::callAll('bbcode', $text);
1904
1905                 return trim($text);
1906         }
1907
1908         /**
1909          * @brief Strips the "abstract" tag from the provided text
1910          *
1911          * @param string $text The text with BBCode
1912          * @return string The same text - but without "abstract" element
1913          */
1914         public static function stripAbstract($text)
1915         {
1916                 $text = preg_replace("/[\s|\n]*\[abstract\].*?\[\/abstract\][\s|\n]*/ism", '', $text);
1917                 $text = preg_replace("/[\s|\n]*\[abstract=.*?\].*?\[\/abstract][\s|\n]*/ism", '', $text);
1918
1919                 return $text;
1920         }
1921
1922         /**
1923          * @brief Returns the value of the "abstract" element
1924          *
1925          * @param string $text The text that maybe contains the element
1926          * @param string $addon The addon for which the abstract is meant for
1927          * @return string The abstract
1928          */
1929         public static function getAbstract($text, $addon = '')
1930         {
1931                 $abstract = '';
1932                 $abstracts = [];
1933                 $addon = strtolower($addon);
1934
1935                 if (preg_match_all("/\[abstract=(.*?)\](.*?)\[\/abstract\]/ism", $text, $results, PREG_SET_ORDER)) {
1936                         foreach ($results AS $result) {
1937                                 $abstracts[strtolower($result[1])] = $result[2];
1938                         }
1939                 }
1940
1941                 if (isset($abstracts[$addon])) {
1942                         $abstract = $abstracts[$addon];
1943                 }
1944
1945                 if ($abstract == '' && preg_match("/\[abstract\](.*?)\[\/abstract\]/ism", $text, $result)) {
1946                         $abstract = $result[1];
1947                 }
1948
1949                 return $abstract;
1950         }
1951
1952         /**
1953          * @brief Callback function to replace a Friendica style mention in a mention for Diaspora
1954          *
1955          * @param array $match Matching values for the callback
1956          *                     [1] = Mention type (! or @)
1957          *                     [2] = Name
1958          *                     [3] = Address
1959          * @return string Replaced mention
1960          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1961          * @throws \ImagickException
1962          */
1963         private static function bbCodeMention2DiasporaCallback($match)
1964         {
1965                 $contact = Contact::getDetailsByURL($match[3]);
1966
1967                 if (empty($contact['addr'])) {
1968                         $contact = Probe::uri($match[3]);
1969                 }
1970
1971                 if (empty($contact['addr'])) {
1972                         return $match[0];
1973                 }
1974
1975                 $mention = $match[1] . '{' . $match[2] . '; ' . $contact['addr'] . '}';
1976                 return $mention;
1977         }
1978
1979         /**
1980          * @brief Converts a BBCode text into Markdown
1981          *
1982          * This function converts a BBCode item body to be sent to Markdown-enabled
1983          * systems like Diaspora and Libertree
1984          *
1985          * @param string $text
1986          * @param bool   $for_diaspora Diaspora requires more changes than Libertree
1987          * @return string
1988          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1989          */
1990         public static function toMarkdown($text, $for_diaspora = true)
1991         {
1992                 $a = DI::app();
1993
1994                 $original_text = $text;
1995
1996                 // Since Diaspora is creating a summary for links, this function removes them before posting
1997                 if ($for_diaspora) {
1998                         $text = self::removeShareInformation($text);
1999                 }
2000
2001                 /**
2002                  * Transform #tags, strip off the [url] and replace spaces with underscore
2003                  */
2004                 $url_search_string = "^\[\]";
2005                 $text = preg_replace_callback("/#\[url\=([$url_search_string]*)\](.*?)\[\/url\]/i",
2006                         function ($matches) {
2007                                 return '#' . str_replace(' ', '_', $matches[2]);
2008                         },
2009                         $text
2010                 );
2011
2012                 // Converting images with size parameters to simple images. Markdown doesn't know it.
2013                 $text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $text);
2014
2015                 // Convert it to HTML - don't try oembed
2016                 if ($for_diaspora) {
2017                         $text = self::convert($text, false, 3);
2018
2019                         // Add all tags that maybe were removed
2020                         if (preg_match_all("/#\[url\=([$url_search_string]*)\](.*?)\[\/url\]/ism", $original_text, $tags)) {
2021                                 $tagline = '';
2022                                 foreach ($tags[2] as $tag) {
2023                                         $tag = html_entity_decode($tag, ENT_QUOTES, 'UTF-8');
2024                                         if (!strpos(html_entity_decode($text, ENT_QUOTES, 'UTF-8'), '#' . $tag)) {
2025                                                 $tagline .= '#' . $tag . ' ';
2026                                         }
2027                                 }
2028                                 $text = $text . " " . $tagline;
2029                         }
2030                 } else {
2031                         $text = self::convert($text, false, 4);
2032                 }
2033
2034                 // If a link is followed by a quote then there should be a newline before it
2035                 // Maybe we should make this newline at every time before a quote.
2036                 $text = str_replace(['</a><blockquote>'], ['</a><br><blockquote>'], $text);
2037
2038                 $stamp1 = microtime(true);
2039
2040                 // Now convert HTML to Markdown
2041                 $text = HTML::toMarkdown($text);
2042
2043                 DI::profiler()->saveTimestamp($stamp1, "parser", System::callstack());
2044
2045                 // Libertree has a problem with escaped hashtags.
2046                 $text = str_replace(['\#'], ['#'], $text);
2047
2048                 // Remove any leading or trailing whitespace, as this will mess up
2049                 // the Diaspora signature verification and cause the item to disappear
2050                 $text = trim($text);
2051
2052                 if ($for_diaspora) {
2053                         $url_search_string = "^\[\]";
2054                         $text = preg_replace_callback(
2055                                 "/([@!])\[(.*?)\]\(([$url_search_string]*?)\)/ism",
2056                                 ['self', 'bbCodeMention2DiasporaCallback'],
2057                                 $text
2058                         );
2059                 }
2060
2061                 Hook::callAll('bb2diaspora', $text);
2062
2063                 return $text;
2064         }
2065
2066         /**
2067      * @brief Pull out all #hashtags and @person tags from $string.
2068      *
2069      * We also get @person@domain.com - which would make
2070      * the regex quite complicated as tags can also
2071      * end a sentence. So we'll run through our results
2072      * and strip the period from any tags which end with one.
2073      * Returns array of tags found, or empty array.
2074      *
2075      * @param string $string Post content
2076      *
2077      * @return array List of tag and person names
2078      */
2079     public static function getTags($string)
2080     {
2081         $ret = [];
2082
2083         // Convert hashtag links to hashtags
2084         $string = preg_replace('/#\[url\=([^\[\]]*)\](.*?)\[\/url\]/ism', '#$2', $string);
2085
2086         // ignore anything in a code block
2087         $string = preg_replace('/\[code.*?\].*?\[\/code\]/sm', '', $string);
2088
2089         // Force line feeds at bbtags
2090         $string = str_replace(['[', ']'], ["\n[", "]\n"], $string);
2091
2092         // ignore anything in a bbtag
2093         $string = preg_replace('/\[(.*?)\]/sm', '', $string);
2094
2095         // Match full names against @tags including the space between first and last
2096         // We will look these up afterward to see if they are full names or not recognisable.
2097
2098         if (preg_match_all('/(@[^ \x0D\x0A,:?]+ [^ \x0D\x0A@,:?]+)([ \x0D\x0A@,:?]|$)/', $string, $matches)) {
2099             foreach ($matches[1] as $match) {
2100                 if (strstr($match, ']')) {
2101                     // we might be inside a bbcode color tag - leave it alone
2102                     continue;
2103                 }
2104
2105                 if (substr($match, -1, 1) === '.') {
2106                     $ret[] = substr($match, 0, -1);
2107                 } else {
2108                     $ret[] = $match;
2109                 }
2110             }
2111         }
2112
2113         // Otherwise pull out single word tags. These can be @nickname, @first_last
2114         // and #hash tags.
2115
2116         if (preg_match_all('/([!#@][^\^ \x0D\x0A,;:?]+)([ \x0D\x0A,;:?]|$)/', $string, $matches)) {
2117             foreach ($matches[1] as $match) {
2118                 if (strstr($match, ']')) {
2119                     // we might be inside a bbcode color tag - leave it alone
2120                     continue;
2121                 }
2122                 if (substr($match, -1, 1) === '.') {
2123                     $match = substr($match,0,-1);
2124                 }
2125                 // ignore strictly numeric tags like #1
2126                 if ((strpos($match, '#') === 0) && ctype_digit(substr($match, 1))) {
2127                     continue;
2128                 }
2129                 // try not to catch url fragments
2130                 if (strpos($string, $match) && preg_match('/[a-zA-z0-9\/]/', substr($string, strpos($string, $match) - 1, 1))) {
2131                     continue;
2132                 }
2133                 $ret[] = $match;
2134             }
2135         }
2136
2137         return $ret;
2138     }
2139 }