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\Cache;
  14 use Friendica\Core\Config;
  15 use Friendica\Core\Hook;
  16 use Friendica\Core\L10n;
  17 use Friendica\Core\Logger;
  18 use Friendica\Core\Protocol;
  19 use Friendica\Core\Renderer;
  20 use Friendica\Core\System;
  21 use Friendica\DI;
  22 use Friendica\Model\Contact;
  23 use Friendica\Model\Event;
  24 use Friendica\Model\Photo;
  25 use Friendica\Network\Probe;
  26 use Friendica\Object\Image;
  27 use Friendica\Protocol\Activity;
  28 use Friendica\Util\Images;
  29 use Friendica\Util\Map;
  30 use Friendica\Util\Network;
  31 use Friendica\Util\ParseUrl;
  32 use Friendica\Util\Proxy as ProxyUtils;
  33 use Friendica\Util\Strings;
  34 use Friendica\Util\XML;
  35
  36 class BBCode
  37 {
  38         /**
  39          * @brief Fetches attachment data that were generated the old way
  40          *
  41          * @param string $body Message body
  42          * @return array
  43          *                     'type' -> Message type ('link', 'video', 'photo')
  44          *                     'text' -> Text before the shared message
  45          *                     'after' -> Text after the shared message
  46          *                     'image' -> Preview image of the message
  47          *                     'url' -> Url to the attached message
  48          *                     'title' -> Title of the attachment
  49          *                     'description' -> Description of the attachment
  50          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  51          */
  52         private static function getOldAttachmentData($body)
  53         {
  54                 $post = [];
  55
  56                 // Simplify image codes
  57                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
  58
  59                 if (preg_match_all("(\[class=(.*?)\](.*?)\[\/class\])ism", $body, $attached, PREG_SET_ORDER)) {
  60                         foreach ($attached as $data) {
  61                                 if (!in_array($data[1], ['type-link', 'type-video', 'type-photo'])) {
  62                                         continue;
  63                                 }
  64
  65                                 $post['type'] = substr($data[1], 5);
  66
  67                                 $pos = strpos($body, $data[0]);
  68                                 if ($pos > 0) {
  69                                         $post['text'] = trim(substr($body, 0, $pos));
  70                                         $post['after'] = trim(substr($body, $pos + strlen($data[0])));
  71                                 } else {
  72                                         $post['text'] = trim(str_replace($data[0], '', $body));
  73                                         $post['after'] = '';
  74                                 }
  75
  76                                 $attacheddata = $data[2];
  77
  78                                 if (preg_match("/\[img\](.*?)\[\/img\]/ism", $attacheddata, $matches)) {
  79
  80                                         $picturedata = Images::getInfoFromURLCached($matches[1]);
  81
  82                                         if ($picturedata) {
  83                                                 if (($picturedata[0] >= 500) && ($picturedata[0] >= $picturedata[1])) {
  84                                                         $post['image'] = $matches[1];
  85                                                 } else {
  86                                                         $post['preview'] = $matches[1];
  87                                                 }
  88                                         }
  89                                 }
  90
  91                                 if (preg_match("/\[bookmark\=(.*?)\](.*?)\[\/bookmark\]/ism", $attacheddata, $matches)) {
  92                                         $post['url'] = $matches[1];
  93                                         $post['title'] = $matches[2];
  94                                 }
  95                                 if (!empty($post['url']) && (in_array($post['type'], ['link', 'video']))
  96                                         && preg_match("/\[url\=(.*?)\](.*?)\[\/url\]/ism", $attacheddata, $matches)) {
  97                                         $post['url'] = $matches[1];
  98                                 }
  99
 100                                 // Search for description
 101                                 if (preg_match("/\[quote\](.*?)\[\/quote\]/ism", $attacheddata, $matches)) {
 102                                         $post['description'] = $matches[1];
 103                                 }
 104                         }
 105                 }
 106                 return $post;
 107         }
 108
 109         /**
 110          * @brief Fetches attachment data that were generated with the "attachment" element
 111          *
 112          * @param string $body Message body
 113          * @return array
 114          *                     'type' -> Message type ('link', 'video', 'photo')
 115          *                     'text' -> Text before the shared message
 116          *                     'after' -> Text after the shared message
 117          *                     'image' -> Preview image of the message
 118          *                     'url' -> Url to the attached message
 119          *                     'title' -> Title of the attachment
 120          *                     'description' -> Description of the attachment
 121          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 122          */
 123         public static function getAttachmentData($body)
 124         {
 125                 $data = [
 126                         'type'        => '',
 127                         'text'        => '',
 128                         'after'       => '',
 129                         'image'       => null,
 130                         'url'         => '',
 131                         'title'       => '',
 132                         'description' => '',
 133                 ];
 134
 135                 if (!preg_match("/(.*)\[attachment(.*?)\](.*?)\[\/attachment\](.*)/ism", $body, $match)) {
 136                         return self::getOldAttachmentData($body);
 137                 }
 138
 139                 $attributes = $match[2];
 140
 141                 $data['text'] = trim($match[1]);
 142
 143                 $type = '';
 144                 preg_match("/type='(.*?)'/ism", $attributes, $matches);
 145                 if (!empty($matches[1])) {
 146                         $type = strtolower($matches[1]);
 147                 }
 148
 149                 preg_match('/type="(.*?)"/ism', $attributes, $matches);
 150                 if (!empty($matches[1])) {
 151                         $type = strtolower($matches[1]);
 152                 }
 153
 154                 if ($type == '') {
 155                         return [];
 156                 }
 157
 158                 if (!in_array($type, ['link', 'audio', 'photo', 'video'])) {
 159                         return [];
 160                 }
 161
 162                 if ($type != '') {
 163                         $data['type'] = $type;
 164                 }
 165
 166                 $url = '';
 167                 preg_match("/url='(.*?)'/ism", $attributes, $matches);
 168                 if (!empty($matches[1])) {
 169                         $url = $matches[1];
 170                 }
 171
 172                 preg_match('/url="(.*?)"/ism', $attributes, $matches);
 173                 if (!empty($matches[1])) {
 174                         $url = $matches[1];
 175                 }
 176
 177                 if ($url != '') {
 178                         $data['url'] = html_entity_decode($url, ENT_QUOTES, 'UTF-8');
 179                 }
 180
 181                 $title = '';
 182                 preg_match("/title='(.*?)'/ism", $attributes, $matches);
 183                 if (!empty($matches[1])) {
 184                         $title = $matches[1];
 185                 }
 186
 187                 preg_match('/title="(.*?)"/ism', $attributes, $matches);
 188                 if (!empty($matches[1])) {
 189                         $title = $matches[1];
 190                 }
 191
 192                 if ($title != '') {
 193                         $title = self::convert(html_entity_decode($title, ENT_QUOTES, 'UTF-8'), false, true);
 194                         $title = html_entity_decode($title, ENT_QUOTES, 'UTF-8');
 195                         $title = str_replace(['[', ']'], ['&#91;', '&#93;'], $title);
 196                         $data['title'] = $title;
 197                 }
 198
 199                 $image = '';
 200                 preg_match("/image='(.*?)'/ism", $attributes, $matches);
 201                 if (!empty($matches[1])) {
 202                         $image = $matches[1];
 203                 }
 204
 205                 preg_match('/image="(.*?)"/ism', $attributes, $matches);
 206                 if (!empty($matches[1])) {
 207                         $image = $matches[1];
 208                 }
 209
 210                 if ($image != '') {
 211                         $data['image'] = html_entity_decode($image, ENT_QUOTES, 'UTF-8');
 212                 }
 213
 214                 $preview = '';
 215                 preg_match("/preview='(.*?)'/ism", $attributes, $matches);
 216                 if (!empty($matches[1])) {
 217                         $preview = $matches[1];
 218                 }
 219
 220                 preg_match('/preview="(.*?)"/ism', $attributes, $matches);
 221                 if (!empty($matches[1])) {
 222                         $preview = $matches[1];
 223                 }
 224
 225                 if ($preview != '') {
 226                         $data['preview'] = html_entity_decode($preview, ENT_QUOTES, 'UTF-8');
 227                 }
 228
 229                 $data['description'] = trim($match[3]);
 230
 231                 $data['after'] = trim($match[4]);
 232
 233                 return $data;
 234         }
 235
 236         public static function getAttachedData($body, $item = [])
 237         {
 238                 /*
 239                 - text:
 240                 - type: link, video, photo
 241                 - title:
 242                 - url:
 243                 - image:
 244                 - description:
 245                 - (thumbnail)
 246                 */
 247
 248                 $has_title = !empty($item['title']);
 249                 $plink = $item['plink'] ?? '';
 250                 $post = self::getAttachmentData($body);
 251
 252                 // Get all linked images with alternative image description
 253                 if (preg_match_all("/\[img=([^\[\]]*)\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures, PREG_SET_ORDER)) {
 254                         foreach ($pictures as $picture) {
 255                                 if (Photo::isLocal($picture[1])) {
 256                                         $post['images'][] = ['url' => str_replace('-1.', '-0.', $picture[1]), 'description' => $picture[2]];
 257                                 }
 258                         }
 259                         if (!empty($post['images']) && !empty($post['images'][0]['description'])) {
 260                                 $post['image_description'] = $post['images'][0]['description'];
 261                         }
 262                 }
 263
 264                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures, PREG_SET_ORDER)) {
 265                         foreach ($pictures as $picture) {
 266                                 if (Photo::isLocal($picture[1])) {
 267                                         $post['images'][] = ['url' => str_replace('-1.', '-0.', $picture[1]), 'description' => ''];
 268                                 }
 269                         }
 270                 }
 271
 272                 // if nothing is found, it maybe having an image.
 273                 if (!isset($post['type'])) {
 274                         // Simplify image codes
 275                         $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 276                         $body = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/ism", '[img]$1[/img]', $body);
 277                         $post['text'] = $body;
 278
 279                         if (preg_match_all("(\[url=(.*?)\]\s*\[img\](.*?)\[\/img\]\s*\[\/url\])ism", $body, $pictures, PREG_SET_ORDER)) {
 280                                 if ((count($pictures) == 1) && !$has_title) {
 281                                         if (!empty($item['object-type']) && ($item['object-type'] == Activity\ObjectType::IMAGE)) {
 282                                                 // Replace the preview picture with the real picture
 283                                                 $url = str_replace('-1.', '-0.', $pictures[0][2]);
 284                                                 $data = ['url' => $url, 'type' => 'photo'];
 285                                         } else {
 286                                                 // Checking, if the link goes to a picture
 287                                                 $data = ParseUrl::getSiteinfoCached($pictures[0][1], true);
 288                                         }
 289
 290                                         // Workaround:
 291                                         // Sometimes photo posts to the own album are not detected at the start.
 292                                         // So we seem to cannot use the cache for these cases. That's strange.
 293                                         if (($data['type'] != 'photo') && strstr($pictures[0][1], "/photos/")) {
 294                                                 $data = ParseUrl::getSiteinfo($pictures[0][1], true);
 295                                         }
 296
 297                                         if ($data['type'] == 'photo') {
 298                                                 $post['type'] = 'photo';
 299                                                 if (isset($data['images'][0])) {
 300                                                         $post['image'] = $data['images'][0]['src'];
 301                                                         $post['url'] = $data['url'];
 302                                                 } else {
 303                                                         $post['image'] = $data['url'];
 304                                                 }
 305
 306                                                 $post['preview'] = $pictures[0][2];
 307                                                 $post['text'] = trim(str_replace($pictures[0][0], '', $body));
 308                                         } else {
 309                                                 $imgdata = Images::getInfoFromURLCached($pictures[0][1]);
 310                                                 if ($imgdata && substr($imgdata['mime'], 0, 6) == 'image/') {
 311                                                         $post['type'] = 'photo';
 312                                                         $post['image'] = $pictures[0][1];
 313                                                         $post['preview'] = $pictures[0][2];
 314                                                         $post['text'] = trim(str_replace($pictures[0][0], '', $body));
 315                                                 }
 316                                         }
 317                                 } elseif (count($pictures) > 0) {
 318                                         $post['type'] = 'link';
 319                                         $post['url'] = $plink;
 320                                         $post['image'] = $pictures[0][2];
 321                                         $post['text'] = $body;
 322
 323                                         foreach ($pictures as $picture) {
 324                                                 $post['text'] = trim(str_replace($picture[0], '', $post['text']));
 325                                         }
 326                                 }
 327                         } elseif (preg_match_all("(\[img\](.*?)\[\/img\])ism", $body, $pictures, PREG_SET_ORDER)) {
 328                                 if ((count($pictures) == 1) && !$has_title) {
 329                                         $post['type'] = 'photo';
 330                                         $post['image'] = $pictures[0][1];
 331                                         $post['text'] = str_replace($pictures[0][0], '', $body);
 332                                 } elseif (count($pictures) > 0) {
 333                                         $post['type'] = 'link';
 334                                         $post['url'] = $plink;
 335                                         $post['image'] = $pictures[0][1];
 336                                         $post['text'] = $body;
 337
 338                                         foreach ($pictures as $picture) {
 339                                                 $post['text'] = trim(str_replace($picture[0], '', $post['text']));
 340                                         }
 341                                 }
 342                         }
 343
 344                         // Test for the external links
 345                         preg_match_all("(\[url\](.*?)\[\/url\])ism", $post['text'], $links1, PREG_SET_ORDER);
 346                         preg_match_all("(\[url\=(.*?)\].*?\[\/url\])ism", $post['text'], $links2, PREG_SET_ORDER);
 347
 348                         $links = array_merge($links1, $links2);
 349
 350                         // If there is only a single one, then use it.
 351                         // This should cover link posts via API.
 352                         if ((count($links) == 1) && !isset($post['preview']) && !$has_title) {
 353                                 $post['type'] = 'link';
 354                                 $post['url'] = $links[0][1];
 355                         }
 356
 357                         // Simplify "video" element
 358                         $post['text'] = preg_replace('(\[video.*?\ssrc\s?=\s?([^\s\]]+).*?\].*?\[/video\])ism', '[video]$1[/video]', $post['text']);
 359
 360                         // Now count the number of external media links
 361                         preg_match_all("(\[vimeo\](.*?)\[\/vimeo\])ism", $post['text'], $links1, PREG_SET_ORDER);
 362                         preg_match_all("(\[youtube\\](.*?)\[\/youtube\\])ism", $post['text'], $links2, PREG_SET_ORDER);
 363                         preg_match_all("(\[video\\](.*?)\[\/video\\])ism", $post['text'], $links3, PREG_SET_ORDER);
 364                         preg_match_all("(\[audio\\](.*?)\[\/audio\\])ism", $post['text'], $links4, PREG_SET_ORDER);
 365
 366                         // Add them to the other external links
 367                         $links = array_merge($links, $links1, $links2, $links3, $links4);
 368
 369                         // Are there more than one?
 370                         if (count($links) > 1) {
 371                                 // The post will be the type "text", which means a blog post
 372                                 unset($post['type']);
 373                                 $post['url'] = $plink;
 374                         }
 375
 376                         if (!isset($post['type'])) {
 377                                 $post['type'] = "text";
 378                                 $post['text'] = trim($body);
 379                         }
 380                 } elseif (isset($post['url']) && ($post['type'] == 'video')) {
 381                         $data = ParseUrl::getSiteinfoCached($post['url'], true);
 382
 383                         if (isset($data['images'][0])) {
 384                                 $post['image'] = $data['images'][0]['src'];
 385                         }
 386                 }
 387
 388                 return $post;
 389         }
 390
 391         /**
 392          * Remove [attachment] BBCode and replaces it with a regular [url]
 393          *
 394          * @param string  $body
 395          * @param boolean $no_link_desc No link description
 396          *
 397          * @return string with replaced body
 398          */
 399         public static function removeAttachment($body, $no_link_desc = false)
 400         {
 401                 return preg_replace_callback("/\s*\[attachment (.*)\](.*?)\[\/attachment\]\s*/ism",
 402                         function ($match) use ($no_link_desc) {
 403                                 $attach_data = self::getAttachmentData($match[0]);
 404                                 if (empty($attach_data['url'])) {
 405                                         return $match[0];
 406                                 } elseif (empty($attach_data['title']) || $no_link_desc) {
 407                                         return "\n[url]" . $attach_data['url'] . "[/url]\n";
 408                                 } else {
 409                                         return "\n[url=" . $attach_data['url'] . ']' . $attach_data['title'] . "[/url]\n";
 410                                 }
 411                 }, $body);
 412         }
 413
 414         /**
 415          * @brief Converts a BBCode text into plaintext
 416          *
 417          * @param      $text
 418          * @param bool $keep_urls Whether to keep URLs in the resulting plaintext
 419          *
 420          * @return string
 421          */
 422         public static function toPlaintext($text, $keep_urls = true)
 423         {
 424                 $naked_text = HTML::toPlaintext(BBCode::convert($text, false, 0, true), 0, !$keep_urls);
 425
 426                 return $naked_text;
 427         }
 428
 429         private static function proxyUrl($image, $simplehtml = false)
 430         {
 431                 // Only send proxied pictures to API and for internal display
 432                 if (in_array($simplehtml, [false, 2])) {
 433                         return ProxyUtils::proxifyUrl($image);
 434                 } else {
 435                         return $image;
 436                 }
 437         }
 438
 439         public static function scaleExternalImages($srctext)
 440         {
 441                 $s = $srctext;
 442
 443                 $matches = null;
 444                 $c = preg_match_all('/\[img.*?\](.*?)\[\/img\]/ism', $s, $matches, PREG_SET_ORDER);
 445                 if ($c) {
 446                         foreach ($matches as $mtch) {
 447                                 Logger::log('scale_external_image: ' . $mtch[1]);
 448
 449                                 $hostname = str_replace('www.', '', substr(DI::baseUrl(), strpos(DI::baseUrl(), '://') + 3));
 450                                 if (stristr($mtch[1], $hostname)) {
 451                                         continue;
 452                                 }
 453
 454                                 $i = Network::fetchUrl($mtch[1]);
 455                                 if (!$i) {
 456                                         return $srctext;
 457                                 }
 458
 459                                 // guess mimetype from headers or filename
 460                                 $type = Images::guessType($mtch[1], true);
 461
 462                                 if ($i) {
 463                                         $Image = new Image($i, $type);
 464                                         if ($Image->isValid()) {
 465                                                 $orig_width = $Image->getWidth();
 466                                                 $orig_height = $Image->getHeight();
 467
 468                                                 if ($orig_width > 640 || $orig_height > 640) {
 469                                                         $Image->scaleDown(640);
 470                                                         $new_width = $Image->getWidth();
 471                                                         $new_height = $Image->getHeight();
 472                                                         Logger::log('scale_external_images: ' . $orig_width . '->' . $new_width . 'w ' . $orig_height . '->' . $new_height . 'h' . ' match: ' . $mtch[0], Logger::DEBUG);
 473                                                         $s = str_replace(
 474                                                                 $mtch[0],
 475                                                                 '[img=' . $new_width . 'x' . $new_height. ']' . $mtch[1] . '[/img]'
 476                                                                 . "\n",
 477                                                                 $s
 478                                                         );
 479                                                         Logger::log('scale_external_images: new string: ' . $s, Logger::DEBUG);
 480                                                 }
 481                                         }
 482                                 }
 483                         }
 484                 }
 485
 486                 return $s;
 487         }
 488
 489         /**
 490          * The purpose of this function is to apply system message length limits to
 491          * imported messages without including any embedded photos in the length
 492          *
 493          * @brief Truncates imported message body string length to max_import_size
 494          * @param string $body
 495          * @return string
 496          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 497          */
 498         public static function limitBodySize($body)
 499         {
 500                 $maxlen = Config::get('config', 'max_import_size', 0);
 501
 502                 // If the length of the body, including the embedded images, is smaller
 503                 // than the maximum, then don't waste time looking for the images
 504                 if ($maxlen && (strlen($body) > $maxlen)) {
 505
 506                         Logger::log('the total body length exceeds the limit', Logger::DEBUG);
 507
 508                         $orig_body = $body;
 509                         $new_body = '';
 510                         $textlen = 0;
 511
 512                         $img_start = strpos($orig_body, '[img');
 513                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 514                         $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 515                         while (($img_st_close !== false) && ($img_end !== false)) {
 516
 517                                 $img_st_close++; // make it point to AFTER the closing bracket
 518                                 $img_end += $img_start;
 519                                 $img_end += strlen('[/img]');
 520
 521                                 if (!strcmp(substr($orig_body, $img_start + $img_st_close, 5), 'data:')) {
 522                                         // This is an embedded image
 523
 524                                         if (($textlen + $img_start) > $maxlen) {
 525                                                 if ($textlen < $maxlen) {
 526                                                         Logger::log('the limit happens before an embedded image', Logger::DEBUG);
 527                                                         $new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 528                                                         $textlen = $maxlen;
 529                                                 }
 530                                         } else {
 531                                                 $new_body = $new_body . substr($orig_body, 0, $img_start);
 532                                                 $textlen += $img_start;
 533                                         }
 534
 535                                         $new_body = $new_body . substr($orig_body, $img_start, $img_end - $img_start);
 536                                 } else {
 537
 538                                         if (($textlen + $img_end) > $maxlen) {
 539                                                 if ($textlen < $maxlen) {
 540                                                         Logger::log('the limit happens before the end of a non-embedded image', Logger::DEBUG);
 541                                                         $new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 542                                                         $textlen = $maxlen;
 543                                                 }
 544                                         } else {
 545                                                 $new_body = $new_body . substr($orig_body, 0, $img_end);
 546                                                 $textlen += $img_end;
 547                                         }
 548                                 }
 549                                 $orig_body = substr($orig_body, $img_end);
 550
 551                                 if ($orig_body === false) {
 552                                         // in case the body ends on a closing image tag
 553                                         $orig_body = '';
 554                                 }
 555
 556                                 $img_start = strpos($orig_body, '[img');
 557                                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 558                                 $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 559                         }
 560
 561                         if (($textlen + strlen($orig_body)) > $maxlen) {
 562                                 if ($textlen < $maxlen) {
 563                                         Logger::log('the limit happens after the end of the last image', Logger::DEBUG);
 564                                         $new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 565                                 }
 566                         } else {
 567                                 Logger::log('the text size with embedded images extracted did not violate the limit', Logger::DEBUG);
 568                                 $new_body = $new_body . $orig_body;
 569                         }
 570
 571                         return $new_body;
 572                 } else {
 573                         return $body;
 574                 }
 575         }
 576
 577         /**
 578          * Processes [attachment] tags
 579          *
 580          * Note: Can produce a [bookmark] tag in the returned string
 581          *
 582          * @brief Processes [attachment] tags
 583          * @param string   $text
 584          * @param bool|int $simplehtml
 585          * @param bool     $tryoembed
 586          * @return string
 587          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 588          */
 589         private static function convertAttachment($text, $simplehtml = false, $tryoembed = true)
 590         {
 591                 $data = self::getAttachmentData($text);
 592                 if (empty($data) || empty($data['url'])) {
 593                         return $text;
 594                 }
 595
 596                 if (isset($data['title'])) {
 597                         $data['title'] = strip_tags($data['title']);
 598                         $data['title'] = str_replace(['http://', 'https://'], '', $data['title']);
 599                 } else {
 600                         $data['title'] = null;
 601                 }
 602
 603                 if (((strpos($data['text'], "[img=") !== false) || (strpos($data['text'], "[img]") !== false) || Config::get('system', 'always_show_preview')) && !empty($data['image'])) {
 604                         $data['preview'] = $data['image'];
 605                         $data['image'] = '';
 606                 }
 607
 608                 $return = '';
 609                 try {
 610                         if ($tryoembed && OEmbed::isAllowedURL($data['url'])) {
 611                                 $return = OEmbed::getHTML($data['url'], $data['title']);
 612                         } else {
 613                                 throw new Exception('OEmbed is disabled for this attachment.');
 614                         }
 615                 } catch (Exception $e) {
 616                         $data['title'] = ($data['title'] ?? '') ?: $data['url'];
 617
 618                         if ($simplehtml != 4) {
 619                                 $return = sprintf('<div class="type-%s">', $data['type']);
 620                         }
 621
 622                         if (!empty($data['title']) && !empty($data['url'])) {
 623                                 if (!empty($data['image']) && empty($data['text']) && ($data['type'] == 'photo')) {
 624                                         $return .= sprintf('<a href="%s" target="_blank"><img src="%s" alt="" title="%s" class="attachment-image" /></a>', $data['url'], self::proxyUrl($data['image'], $simplehtml), $data['title']);
 625                                 } else {
 626                                         if (!empty($data['image'])) {
 627                                                 $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), $data['title']);
 628                                         } elseif (!empty($data['preview'])) {
 629                                                 $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']);
 630                                         }
 631                                         $return .= sprintf('<h4><a href="%s">%s</a></h4>', $data['url'], $data['title']);
 632                                 }
 633                         }
 634
 635                         if (!empty($data['description']) && $data['description'] != $data['title']) {
 636                                 // Sanitize the HTML by converting it to BBCode
 637                                 $bbcode = HTML::toBBCode($data['description']);
 638                                 $return .= sprintf('<blockquote>%s</blockquote>', trim(self::convert($bbcode)));
 639                         }
 640
 641                         if (!empty($data['url'])) {
 642                                 $return .= sprintf('<sup><a href="%s">%s</a></sup>', $data['url'], parse_url($data['url'], PHP_URL_HOST));
 643                         }
 644
 645                         if ($simplehtml != 4) {
 646                                 $return .= '</div>';
 647                         }
 648                 }
 649
 650                 return trim(($data['text'] ?? '') . ' ' . $return . ' ' . ($data['after'] ?? ''));
 651         }
 652
 653         public static function removeShareInformation($Text, $plaintext = false, $nolink = false)
 654         {
 655                 $data = self::getAttachmentData($Text);
 656
 657                 if (!$data) {
 658                         return $Text;
 659                 } elseif ($nolink) {
 660                         return $data['text'] . ($data['after'] ?? '');
 661                 }
 662
 663                 $title = htmlentities($data['title'] ?? '', ENT_QUOTES, 'UTF-8', false);
 664                 $text = htmlentities($data['text'], ENT_QUOTES, 'UTF-8', false);
 665                 if ($plaintext || (($title != '') && strstr($text, $title))) {
 666                         $data['title'] = $data['url'];
 667                 } elseif (($text != '') && strstr($title, $text)) {
 668                         $data['text'] = $data['title'];
 669                         $data['title'] = $data['url'];
 670                 }
 671
 672                 if (empty($data['text']) && !empty($data['title']) && empty($data['url'])) {
 673                         return $data['title'] . $data['after'];
 674                 }
 675
 676                 // If the link already is included in the post, don't add it again
 677                 if (!empty($data['url']) && strpos($data['text'], $data['url'])) {
 678                         return $data['text'] . $data['after'];
 679                 }
 680
 681                 $text = $data['text'];
 682
 683                 if (!empty($data['url']) && !empty($data['title'])) {
 684                         $text .= "\n[url=" . $data['url'] . ']' . $data['title'] . '[/url]';
 685                 } elseif (!empty($data['url'])) {
 686                         $text .= "\n[url]" . $data['url'] . '[/url]';
 687                 }
 688
 689                 return $text . "\n" . $data['after'];
 690         }
 691
 692         /**
 693          * Converts [url] BBCodes in a format that looks fine on Mastodon. (callback function)
 694          *
 695          * @brief Converts [url] BBCodes in a format that looks fine on Mastodon. (callback function)
 696          * @param array $match Array with the matching values
 697          * @return string reformatted link including HTML codes
 698          */
 699         private static function convertUrlForActivityPubCallback($match)
 700         {
 701                 $url = $match[1];
 702
 703                 if (isset($match[2]) && ($match[1] != $match[2])) {
 704                         return $match[0];
 705                 }
 706
 707                 $parts = parse_url($url);
 708                 if (!isset($parts['scheme'])) {
 709                         return $match[0];
 710                 }
 711
 712                 return self::convertUrlForActivityPub($url);
 713         }
 714
 715         /**
 716          * @brief Converts [url] BBCodes in a format that looks fine on ActivityPub systems.
 717          * @param string $url URL that is about to be reformatted
 718          * @return string reformatted link including HTML codes
 719          */
 720         private static function convertUrlForActivityPub($url)
 721         {
 722                 $html = '<a href="%s" target="_blank">%s</a>';
 723                 return sprintf($html, $url, self::getStyledURL($url));
 724         }
 725
 726         /**
 727          * Converts an URL in a nicer format (without the scheme and possibly shortened)
 728          * @param string $url URL that is about to be reformatted
 729          * @return string reformatted link
 730          */
 731         private static function getStyledURL($url)
 732         {
 733                 $parts = parse_url($url);
 734                 $scheme = $parts['scheme'] . '://';
 735                 $styled_url = str_replace($scheme, '', $url);
 736
 737                 if (strlen($styled_url) > 30) {
 738                         $styled_url = substr($styled_url, 0, 30) . "…";
 739                 }
 740
 741                 return $styled_url;
 742         }
 743
 744         /*
 745          * [noparse][i]italic[/i][/noparse] turns into
 746          * [noparse][ i ]italic[ /i ][/noparse],
 747          * to hide them from parser.
 748          */
 749         private static function escapeNoparseCallback($match)
 750         {
 751                 $whole_match = $match[0];
 752                 $captured = $match[1];
 753                 $spacefied = preg_replace("/\[(.*?)\]/", "[ $1 ]", $captured);
 754                 $new_str = str_replace($captured, $spacefied, $whole_match);
 755                 return $new_str;
 756         }
 757
 758         /*
 759          * The previously spacefied [noparse][ i ]italic[ /i ][/noparse],
 760          * now turns back and the [noparse] tags are trimed
 761          * returning [i]italic[/i]
 762          */
 763         private static function unescapeNoparseCallback($match)
 764         {
 765                 $captured = $match[1];
 766                 $unspacefied = preg_replace("/\[ (.*?)\ ]/", "[$1]", $captured);
 767                 return $unspacefied;
 768         }
 769
 770         /**
 771          * Returns the bracket character positions of a set of opening and closing BBCode tags, optionally skipping first
 772          * occurrences
 773          *
 774          * @param string $text        Text to search
 775          * @param string $name        Tag name
 776          * @param int    $occurrences Number of first occurrences to skip
 777          * @return boolean|array
 778          */
 779         public static function getTagPosition($text, $name, $occurrences = 0)
 780         {
 781                 if ($occurrences < 0) {
 782                         $occurrences = 0;
 783                 }
 784
 785                 $start_open = -1;
 786                 for ($i = 0; $i <= $occurrences; $i++) {
 787                         if ($start_open !== false) {
 788                                 $start_open = strpos($text, '[' . $name, $start_open + 1); // allow [name= type tags
 789                         }
 790                 }
 791
 792                 if ($start_open === false) {
 793                         return false;
 794                 }
 795
 796                 $start_equal = strpos($text, '=', $start_open);
 797                 $start_close = strpos($text, ']', $start_open);
 798
 799                 if ($start_close === false) {
 800                         return false;
 801                 }
 802
 803                 $start_close++;
 804
 805                 $end_open = strpos($text, '[/' . $name . ']', $start_close);
 806
 807                 if ($end_open === false) {
 808                         return false;
 809                 }
 810
 811                 $res = [
 812                         'start' => [
 813                                 'open' => $start_open,
 814                                 'close' => $start_close
 815                         ],
 816                         'end' => [
 817                                 'open' => $end_open,
 818                                 'close' => $end_open + strlen('[/' . $name . ']')
 819                         ],
 820                 ];
 821
 822                 if ($start_equal !== false) {
 823                         $res['start']['equal'] = $start_equal + 1;
 824                 }
 825
 826                 return $res;
 827         }
 828
 829         /**
 830          * Performs a preg_replace within the boundaries of all named BBCode tags in a text
 831          *
 832          * @param string $pattern Preg pattern string
 833          * @param string $replace Preg replace string
 834          * @param string $name    BBCode tag name
 835          * @param string $text    Text to search
 836          * @return string
 837          */
 838         public static function pregReplaceInTag($pattern, $replace, $name, $text)
 839         {
 840                 $occurrences = 0;
 841                 $pos = self::getTagPosition($text, $name, $occurrences);
 842                 while ($pos !== false && $occurrences++ < 1000) {
 843                         $start = substr($text, 0, $pos['start']['open']);
 844                         $subject = substr($text, $pos['start']['open'], $pos['end']['close'] - $pos['start']['open']);
 845                         $end = substr($text, $pos['end']['close']);
 846                         if ($end === false) {
 847                                 $end = '';
 848                         }
 849
 850                         $subject = preg_replace($pattern, $replace, $subject);
 851                         $text = $start . $subject . $end;
 852
 853                         $pos = self::getTagPosition($text, $name, $occurrences);
 854                 }
 855
 856                 return $text;
 857         }
 858
 859         private static function extractImagesFromItemBody($body)
 860         {
 861                 $saved_image = [];
 862                 $orig_body = $body;
 863                 $new_body = '';
 864
 865                 $cnt = 0;
 866                 $img_start = strpos($orig_body, '[img');
 867                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 868                 $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 869                 while (($img_st_close !== false) && ($img_end !== false)) {
 870                         $img_st_close++; // make it point to AFTER the closing bracket
 871                         $img_end += $img_start;
 872
 873                         if (!strcmp(substr($orig_body, $img_start + $img_st_close, 5), 'data:')) {
 874                                 // This is an embedded image
 875                                 $saved_image[$cnt] = substr($orig_body, $img_start + $img_st_close, $img_end - ($img_start + $img_st_close));
 876                                 $new_body = $new_body . substr($orig_body, 0, $img_start) . '[$#saved_image' . $cnt . '#$]';
 877
 878                                 $cnt++;
 879                         } else {
 880                                 $new_body = $new_body . substr($orig_body, 0, $img_end + strlen('[/img]'));
 881                         }
 882
 883                         $orig_body = substr($orig_body, $img_end + strlen('[/img]'));
 884
 885                         if ($orig_body === false) {
 886                                 // in case the body ends on a closing image tag
 887                                 $orig_body = '';
 888                         }
 889
 890                         $img_start = strpos($orig_body, '[img');
 891                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 892                         $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 893                 }
 894
 895                 $new_body = $new_body . $orig_body;
 896
 897                 return ['body' => $new_body, 'images' => $saved_image];
 898         }
 899
 900         private static function interpolateSavedImagesIntoItemBody($body, array $images)
 901         {
 902                 $newbody = $body;
 903
 904                 $cnt = 0;
 905                 foreach ($images as $image) {
 906                         // We're depending on the property of 'foreach' (specified on the PHP website) that
 907                         // it loops over the array starting from the first element and going sequentially
 908                         // to the last element
 909                         $newbody = str_replace('[$#saved_image' . $cnt . '#$]',
 910                                 '<img src="' . self::proxyUrl($image) . '" alt="' . L10n::t('Image/photo') . '" />', $newbody);
 911                         $cnt++;
 912                 }
 913
 914                 return $newbody;
 915         }
 916
 917         /**
 918          * This function converts a [share] block to text according to a provided callback function whose signature is:
 919          *
 920          * function(array $attributes, array $author_contact, string $content, boolean $is_quote_share): string
 921          *
 922          * Where:
 923          * - $attributes is an array of attributes of the [share] block itself. Missing keys will be completed by the contact
 924          * data lookup
 925          * - $author_contact is a contact record array
 926          * - $content is the inner content of the [share] block
 927          * - $is_quote_share indicates whether there's any content before the [share] block
 928          * - Return value is the string that should replace the [share] block in the provided text
 929          *
 930          * This function is intended to be used by addon connector to format a share block like the target network is expecting it.
 931          *
 932          * @param  string   $text     A BBCode string
 933          * @param  callable $callback
 934          * @return string The BBCode string with all [share] blocks replaced
 935          */
 936         public static function convertShare($text, callable $callback)
 937         {
 938                 $return = preg_replace_callback(
 939                         "/(.*?)\[share(.*?)\](.*)\[\/share\]/ism",
 940                         function ($match) use ($callback) {
 941                                 $attribute_string = $match[2];
 942                                 $attributes = [];
 943                                 foreach (['author', 'profile', 'avatar', 'link', 'posted'] as $field) {
 944                                         preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches);
 945                                         $attributes[$field] = html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8');
 946                                 }
 947
 948                                 // We only call this so that a previously unknown contact can be added.
 949                                 // This is important for the function "Model\Contact::getDetailsByURL()".
 950                                 // This function then can fetch an entry from the contact table.
 951                                 $default['url'] = $attributes['profile'];
 952
 953                                 if (!empty($attributes['author'])) {
 954                                         $default['name'] = $attributes['author'];
 955                                 }
 956
 957                                 if (!empty($attributes['avatar'])) {
 958                                         $default['photo'] = $attributes['avatar'];
 959                                 }
 960
 961                                 Contact::getIdForURL($attributes['profile'], 0, true, $default);
 962
 963                                 $author_contact = Contact::getDetailsByURL($attributes['profile']);
 964                                 $author_contact['addr'] = ($author_contact['addr']  ?? '') ?: Protocol::getAddrFromProfileUrl($attributes['profile']);
 965
 966                                 $attributes['author']   = ($author_contact['name']  ?? '') ?: $attributes['author'];
 967                                 $attributes['avatar']   = ($author_contact['micro'] ?? '') ?: $attributes['avatar'];
 968                                 $attributes['profile']  = ($author_contact['url']   ?? '') ?: $attributes['profile'];
 969
 970                                 // $author_contact['url'] could be empty. So then we fill it with the profile
 971                                 $author_contact['url']  = ($attributes['profile']   ?? '') ?: $author_contact['url'];
 972
 973                                 if ($attributes['avatar']) {
 974                                         $attributes['avatar'] = ProxyUtils::proxifyUrl($attributes['avatar'], false, ProxyUtils::SIZE_THUMB);
 975                                 }
 976
 977                                 return $match[1] . $callback($attributes, $author_contact, $match[3], trim($match[1]) != '');
 978                         },
 979                         $text
 980                 );
 981
 982                 return $return;
 983         }
 984
 985         /**
 986          * Default [share] tag conversion callback
 987          *
 988          * Note: Can produce a [bookmark] tag in the output
 989          *
 990          * @see BBCode::convertShare()
 991          * @param array   $attributes     [share] block attribute values
 992          * @param array   $author_contact Contact row of the shared author
 993          * @param string  $content        Inner content of the [share] block
 994          * @param boolean $is_quote_share Whether there is content before the [share] block
 995          * @param integer $simplehtml     Mysterious integer value depending on the target network/formatting style
 996          * @return string
 997          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 998          */
 999         private static function convertShareCallback(array $attributes, array $author_contact, $content, $is_quote_share, $simplehtml)
1000         {
1001                 $mention = Protocol::formatMention($attributes['profile'], $attributes['author']);
1002
1003                 switch ($simplehtml) {
1004                         case 1:
1005                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' <a href="' . $attributes['profile'] . '">' . $mention . '</a>: </p>' . "\n" . '«' . $content . '»';
1006                                 break;
1007                         case 2:
1008                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' ' . $author_contact['addr'] . ': </p>' . "\n" . $content;
1009                                 break;
1010                         case 3: // Diaspora
1011                                 if (stripos(Strings::normaliseLink($attributes['link']), 'http://twitter.com/') === 0) {
1012                                         $text = ($is_quote_share? '<hr />' : '') . '<p><a href="' . $attributes['link'] . '">' . $attributes['link'] . '</a></p>' . "\n";
1013                                 } else {
1014                                         $headline = '<p><b>♲ <a href="' . $attributes['profile'] . '">' . $attributes['author'] . '</a>:</b></p>' . "\n";
1015
1016                                         if (!empty($attributes['posted']) && !empty($attributes['link'])) {
1017                                                 $headline = '<p><b>♲ <a href="' . $attributes['profile'] . '">' . $attributes['author'] . '</a></b> - <a href="' . $attributes['link'] . '">' . $attributes['posted'] . ' GMT</a></p>' . "\n";
1018                                         }
1019
1020                                         $text = ($is_quote_share? '<hr />' : '') . $headline . '<blockquote>' . trim($content) . '</blockquote>' . "\n";
1021
1022                                         if (empty($attributes['posted']) && !empty($attributes['link'])) {
1023                                                 $text .= '<p><a href="' . $attributes['link'] . '">[Source]</a></p>' . "\n";
1024                                         }
1025                                 }
1026
1027                                 break;
1028                         case 4:
1029                                 $headline = '<p><b>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8');
1030                                 $headline .= L10n::t('<a href="%1$s" target="_blank">%2$s</a> %3$s', $attributes['link'], $mention, $attributes['posted']);
1031                                 $headline .= ':</b></p>' . "\n";
1032
1033                                 $text = ($is_quote_share? '<hr />' : '') . $headline . '<blockquote class="shared_content">' . trim($content) . '</blockquote>' . "\n";
1034
1035                                 break;
1036                         case 5:
1037                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' ' . $author_contact['addr'] . ': </p>' . "\n" . $content;
1038                                 break;
1039                         case 7: // statusnet/GNU Social
1040                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' @' . $author_contact['addr'] . ': ' . $content . '</p>' . "\n";
1041                                 break;
1042                         case 9: // ActivityPub
1043                                 $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>';
1044                                 $text = '<div><a href="' . $attributes['link'] . '">' . html_entity_decode('&#x2672;', ENT_QUOTES, 'UTF-8') . '</a> ' . $author . '<blockquote>' . $content . '</blockquote></div>' . "\n";
1045                                 break;
1046                         default:
1047                                 // Transforms quoted tweets in rich attachments to avoid nested tweets
1048                                 if (stripos(Strings::normaliseLink($attributes['link']), 'http://twitter.com/') === 0 && OEmbed::isAllowedURL($attributes['link'])) {
1049                                         try {
1050                                                 $text = ($is_quote_share? '<br />' : '') . OEmbed::getHTML($attributes['link']);
1051                                         } catch (Exception $e) {
1052                                                 $text = ($is_quote_share? '<br />' : '') . sprintf('[bookmark=%s]%s[/bookmark]', $attributes['link'], $content);
1053                                         }
1054                                 } else {
1055                                         $text = ($is_quote_share? "\n" : '');
1056
1057                                         $tpl = Renderer::getMarkupTemplate('shared_content.tpl');
1058                                         $text .= Renderer::replaceMacros($tpl, [
1059                                                 '$profile' => $attributes['profile'],
1060                                                 '$avatar'  => $attributes['avatar'],
1061                                                 '$author'  => $attributes['author'],
1062                                                 '$link'    => $attributes['link'],
1063                                                 '$posted'  => $attributes['posted'],
1064                                                 '$content' => trim($content)
1065                                         ]);
1066                                 }
1067                                 break;
1068                 }
1069
1070                 return $text;
1071         }
1072
1073         private static function removePictureLinksCallback($match)
1074         {
1075                 $cache_key = 'remove:' . $match[1];
1076                 $text = Cache::get($cache_key);
1077
1078                 if (is_null($text)) {
1079                         $a = DI::app();
1080
1081                         $stamp1 = microtime(true);
1082
1083                         $ch = @curl_init($match[1]);
1084                         @curl_setopt($ch, CURLOPT_NOBODY, true);
1085                         @curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
1086                         @curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
1087                         @curl_exec($ch);
1088                         $curl_info = @curl_getinfo($ch);
1089
1090                         DI::profiler()->saveTimestamp($stamp1, "network", System::callstack());
1091
1092                         if (substr($curl_info['content_type'], 0, 6) == 'image/') {
1093                                 $text = "[url=" . $match[1] . ']' . $match[1] . "[/url]";
1094                         } else {
1095                                 $text = "[url=" . $match[2] . ']' . $match[2] . "[/url]";
1096
1097                                 // if its not a picture then look if its a page that contains a picture link
1098                                 $body = Network::fetchUrl($match[1]);
1099
1100                                 $doc = new DOMDocument();
1101                                 @$doc->loadHTML($body);
1102                                 $xpath = new DOMXPath($doc);
1103                                 $list = $xpath->query("//meta[@name]");
1104                                 foreach ($list as $node) {
1105                                         $attr = [];
1106
1107                                         if ($node->attributes->length) {
1108                                                 foreach ($node->attributes as $attribute) {
1109                                                         $attr[$attribute->name] = $attribute->value;
1110                                                 }
1111                                         }
1112
1113                                         if (strtolower($attr['name']) == 'twitter:image') {
1114                                                 $text = '[url=' . $attr['content'] . ']' . $attr['content'] . '[/url]';
1115                                         }
1116                                 }
1117                         }
1118                         Cache::set($cache_key, $text);
1119                 }
1120
1121                 return $text;
1122         }
1123
1124         private static function expandLinksCallback($match)
1125         {
1126                 if (($match[3] == '') || ($match[2] == $match[3]) || stristr($match[2], $match[3])) {
1127                         return ($match[1] . "[url]" . $match[2] . "[/url]");
1128                 } else {
1129                         return ($match[1] . $match[3] . " [url]" . $match[2] . "[/url]");
1130                 }
1131         }
1132
1133         private static function cleanPictureLinksCallback($match)
1134         {
1135                 $a = DI::app();
1136
1137                 // When the picture link is the own photo path then we can avoid fetching the link
1138                 $own_photo_url = preg_quote(Strings::normaliseLink(DI::baseUrl()->get()) . '/photos/');
1139                 if (preg_match('|' . $own_photo_url . '.*?/image/|', Strings::normaliseLink($match[1]))) {
1140                         if (!empty($match[3])) {
1141                                 $text = '[img=' . str_replace('-1.', '-0.', $match[2]) . ']' . $match[3] . '[/img]';
1142                         } else {
1143                                 $text = '[img]' . str_replace('-1.', '-0.', $match[2]) . '[/img]';
1144                         }
1145                         return $text;
1146                 }
1147
1148                 $cache_key = 'clean:' . $match[1];
1149                 $text = Cache::get($cache_key);
1150                 if (!is_null($text)) {
1151                         return $text;
1152                 }
1153
1154                 // Only fetch the header, not the content
1155                 $stamp1 = microtime(true);
1156
1157                 $ch = @curl_init($match[1]);
1158                 @curl_setopt($ch, CURLOPT_NOBODY, true);
1159                 @curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
1160                 @curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
1161                 @curl_exec($ch);
1162                 $curl_info = @curl_getinfo($ch);
1163
1164                 DI::profiler()->saveTimestamp($stamp1, "network", System::callstack());
1165
1166                 // if its a link to a picture then embed this picture
1167                 if (substr($curl_info['content_type'], 0, 6) == 'image/') {
1168                         $text = '[img]' . $match[1] . '[/img]';
1169                 } else {
1170                         if (!empty($match[3])) {
1171                                 $text = '[img=' . $match[2] . ']' . $match[3] . '[/img]';
1172                         } else {
1173                                 $text = '[img]' . $match[2] . '[/img]';
1174                         }
1175
1176                         // if its not a picture then look if its a page that contains a picture link
1177                         $body = Network::fetchUrl($match[1]);
1178
1179                         $doc = new DOMDocument();
1180                         @$doc->loadHTML($body);
1181                         $xpath = new DOMXPath($doc);
1182                         $list = $xpath->query("//meta[@name]");
1183                         foreach ($list as $node) {
1184                                 $attr = [];
1185                                 if ($node->attributes->length) {
1186                                         foreach ($node->attributes as $attribute) {
1187                                                 $attr[$attribute->name] = $attribute->value;
1188                                         }
1189                                 }
1190
1191                                 if (strtolower($attr['name']) == "twitter:image") {
1192                                         if (!empty($match[3])) {
1193                                                 $text = "[img=" . $attr['content'] . "]" . $match[3] . "[/img]";
1194                                         } else {
1195                                                 $text = "[img]" . $attr['content'] . "[/img]";
1196                                         }
1197                                 }
1198                         }
1199                 }
1200                 Cache::set($cache_key, $text);
1201
1202                 return $text;
1203         }
1204
1205         public static function cleanPictureLinks($text)
1206         {
1207                 $return = preg_replace_callback("&\[url=([^\[\]]*)\]\[img=(.*)\](.*)\[\/img\]\[\/url\]&Usi", 'self::cleanPictureLinksCallback', $text);
1208                 $return = preg_replace_callback("&\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]&Usi", 'self::cleanPictureLinksCallback', $return);
1209                 return $return;
1210         }
1211
1212         /**
1213          * @brief Converts a BBCode message to HTML message
1214          *
1215          * BBcode 2 HTML was written by WAY2WEB.net
1216          * extended to work with Mistpark/Friendica - Mike Macgirvin
1217          *
1218          * Simple HTML values meaning:
1219          * - 0: Friendica display
1220          * - 1: Unused
1221          * - 2: Used for Windows Phone push, Friendica API
1222          * - 3: Used before converting to Markdown in bb2diaspora.php
1223          * - 4: Used for WordPress, Libertree (before Markdown), pump.io and tumblr
1224          * - 5: Unused
1225          * - 6: Unused
1226          * - 7: Used for dfrn, OStatus
1227          * - 8: Used for Twitter, WP backlink text setting
1228          * - 9: ActivityPub
1229          *
1230          * @param string $text
1231          * @param bool   $try_oembed
1232          * @param int    $simple_html
1233          * @param bool   $for_plaintext
1234          * @return string
1235          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1236          */
1237         public static function convert($text, $try_oembed = true, $simple_html = 0, $for_plaintext = false)
1238         {
1239                 $a = DI::app();
1240
1241                 /*
1242                  * preg_match_callback function to replace potential Oembed tags with Oembed content
1243                  *
1244                  * $match[0] = [tag]$url[/tag] or [tag=$url]$title[/tag]
1245                  * $match[1] = $url
1246                  * $match[2] = $title or absent
1247                  */
1248                 $try_oembed_callback = function ($match)
1249                 {
1250                         $url = $match[1];
1251                         $title = $match[2] ?? null;
1252
1253                         try {
1254                                 $return = OEmbed::getHTML($url, $title);
1255                         } catch (Exception $ex) {
1256                                 $return = $match[0];
1257                         }
1258
1259                         return $return;
1260                 };
1261
1262                 // Extracting code blocks before the whitespace processing and the autolinker
1263                 $codeblocks = [];
1264
1265                 $text = preg_replace_callback("#\[code(?:=([^\]]*))?\](.*?)\[\/code\]#ism",
1266                         function ($matches) use (&$codeblocks) {
1267                                 $return = '#codeblock-' . count($codeblocks) . '#';
1268                                 if (strpos($matches[2], "\n") !== false) {
1269                                         $codeblocks[] = '<pre><code class="language-' . trim($matches[1]) . '">' . htmlspecialchars(trim($matches[2], "\n\r"), ENT_NOQUOTES, 'UTF-8') . '</code></pre>';
1270                                 } else {
1271                                         $codeblocks[] = '<code>' . htmlspecialchars($matches[2], ENT_NOQUOTES, 'UTF-8') . '</code>';
1272                                 }
1273
1274                                 return $return;
1275                         },
1276                         $text
1277                 );
1278
1279                 // Hide all [noparse] contained bbtags by spacefying them
1280                 // POSSIBLE BUG --> Will the 'preg' functions crash if there's an embedded image?
1281
1282                 $text = preg_replace_callback("/\[noparse\](.*?)\[\/noparse\]/ism", 'self::escapeNoparseCallback', $text);
1283                 $text = preg_replace_callback("/\[nobb\](.*?)\[\/nobb\]/ism", 'self::escapeNoparseCallback', $text);
1284                 $text = preg_replace_callback("/\[pre\](.*?)\[\/pre\]/ism", 'self::escapeNoparseCallback', $text);
1285
1286                 // Remove the abstract element. It is a non visible element.
1287                 $text = self::stripAbstract($text);
1288
1289                 // Move all spaces out of the tags
1290                 $text = preg_replace("/\[(\w*)\](\s*)/ism", '$2[$1]', $text);
1291                 $text = preg_replace("/(\s*)\[\/(\w*)\]/ism", '[/$2]$1', $text);
1292
1293                 // Extract the private images which use data urls since preg has issues with
1294                 // large data sizes. Stash them away while we do bbcode conversion, and then put them back
1295                 // in after we've done all the regex matching. We cannot use any preg functions to do this.
1296
1297                 $extracted = self::extractImagesFromItemBody($text);
1298                 $text = $extracted['body'];
1299                 $saved_image = $extracted['images'];
1300
1301                 // If we find any event code, turn it into an event.
1302                 // After we're finished processing the bbcode we'll
1303                 // replace all of the event code with a reformatted version.
1304
1305                 $ev = Event::fromBBCode($text);
1306
1307                 // Replace any html brackets with HTML Entities to prevent executing HTML or script
1308                 // Don't use strip_tags here because it breaks [url] search by replacing & with amp
1309
1310                 $text = str_replace("<", "&lt;", $text);
1311                 $text = str_replace(">", "&gt;", $text);
1312
1313                 // remove some newlines before the general conversion
1314                 $text = preg_replace("/\s?\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "[share$1]$2[/share]", $text);
1315                 $text = preg_replace("/\s?\[quote(.*?)\]\s?(.*?)\s?\[\/quote\]\s?/ism", "[quote$1]$2[/quote]", $text);
1316
1317                 // when the content is meant exporting to other systems then remove the avatar picture since this doesn't really look good on these systems
1318                 if (!$try_oembed) {
1319                         $text = preg_replace("/\[share(.*?)avatar\s?=\s?'.*?'\s?(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "\n[share$1$2]$3[/share]", $text);
1320                 }
1321
1322                 // Convert new line chars to html <br /> tags
1323
1324                 // nlbr seems to be hopelessly messed up
1325                 //      $Text = nl2br($Text);
1326
1327                 // We'll emulate it.
1328
1329                 $text = trim($text);
1330                 $text = str_replace("\r\n", "\n", $text);
1331
1332                 // Remove linefeeds inside of the table elements. See issue #6799
1333                 $search = ["\n[th]", "[th]\n", " [th]", "\n[/th]", "[/th]\n", "[/th] ",
1334                         "\n[td]", "[td]\n", " [td]", "\n[/td]", "[/td]\n", "[/td] ",
1335                         "\n[tr]", "[tr]\n", " [tr]", "[tr] ", "\n[/tr]", "[/tr]\n", " [/tr]", "[/tr] ",
1336                         "[table]\n", "[table] ", " [table]", "\n[/table]", " [/table]", "[/table] "];
1337                 $replace = ["[th]", "[th]", "[th]", "[/th]", "[/th]", "[/th]",
1338                         "[td]", "[td]", "[td]", "[/td]", "[/td]", "[/td]",
1339                         "[tr]", "[tr]", "[tr]", "[tr]", "[/tr]", "[/tr]", "[/tr]", "[/tr]",
1340                         "[table]", "[table]", "[table]", "[/table]", "[/table]", "[/table]"];
1341                 do {
1342                         $oldtext = $text;
1343                         $text = str_replace($search, $replace, $text);
1344                 } while ($oldtext != $text);
1345
1346                 // Replace these here only once
1347                 $search = ["\n[table]", "[/table]\n"];
1348                 $replace = ["[table]", "[/table]"];
1349                 $text = str_replace($search, $replace, $text);
1350
1351                 // removing multiplicated newlines
1352                 if (Config::get('system', 'remove_multiplicated_lines')) {
1353                         $search = ["\n\n\n", "\n ", " \n", "[/quote]\n\n", "\n[/quote]", "[/li]\n", "\n[li]", "\n[ul]", "[/ul]\n", "\n\n[share ", "[/attachment]\n",
1354                                         "\n[h1]", "[/h1]\n", "\n[h2]", "[/h2]\n", "\n[h3]", "[/h3]\n", "\n[h4]", "[/h4]\n", "\n[h5]", "[/h5]\n", "\n[h6]", "[/h6]\n"];
1355                         $replace = ["\n\n", "\n", "\n", "[/quote]\n", "[/quote]", "[/li]", "[li]", "[ul]", "[/ul]", "\n[share ", "[/attachment]",
1356                                         "[h1]", "[/h1]", "[h2]", "[/h2]", "[h3]", "[/h3]", "[h4]", "[/h4]", "[h5]", "[/h5]", "[h6]", "[/h6]"];
1357                         do {
1358                                 $oldtext = $text;
1359                                 $text = str_replace($search, $replace, $text);
1360                         } while ($oldtext != $text);
1361                 }
1362
1363                 /// @todo Have a closer look at the different html modes
1364                 // Handle attached links or videos
1365                 if (in_array($simple_html, [9])) {
1366                         $text = self::removeAttachment($text);
1367                 } elseif (!in_array($simple_html, [0, 4])) {
1368                         $text = self::removeAttachment($text, true);
1369                 } else {
1370                         $text = self::convertAttachment($text, $simple_html, $try_oembed);
1371                 }
1372
1373                 // leave open the posibility of [map=something]
1374                 // this is replaced in Item::prepareBody() which has knowledge of the item location
1375                 if (strpos($text, '[/map]') !== false) {
1376                         $text = preg_replace_callback(
1377                                 "/\[map\](.*?)\[\/map\]/ism",
1378                                 function ($match) use ($simple_html) {
1379                                         return str_replace($match[0], '<p class="map">' . Map::byLocation($match[1], $simple_html) . '</p>', $match[0]);
1380                                 },
1381                                 $text
1382                         );
1383                 }
1384
1385                 if (strpos($text, '[map=') !== false) {
1386                         $text = preg_replace_callback(
1387                                 "/\[map=(.*?)\]/ism",
1388                                 function ($match) use ($simple_html) {
1389                                         return str_replace($match[0], '<p class="map">' . Map::byCoordinates(str_replace('/', ' ', $match[1]), $simple_html) . '</p>', $match[0]);
1390                                 },
1391                                 $text
1392                         );
1393                 }
1394
1395                 if (strpos($text, '[map]') !== false) {
1396                         $text = preg_replace("/\[map\]/", '<p class="map"></p>', $text);
1397                 }
1398
1399                 // Check for headers
1400                 $text = preg_replace("(\[h1\](.*?)\[\/h1\])ism", '<h1>$1</h1>', $text);
1401                 $text = preg_replace("(\[h2\](.*?)\[\/h2\])ism", '<h2>$1</h2>', $text);
1402                 $text = preg_replace("(\[h3\](.*?)\[\/h3\])ism", '<h3>$1</h3>', $text);
1403                 $text = preg_replace("(\[h4\](.*?)\[\/h4\])ism", '<h4>$1</h4>', $text);
1404                 $text = preg_replace("(\[h5\](.*?)\[\/h5\])ism", '<h5>$1</h5>', $text);
1405                 $text = preg_replace("(\[h6\](.*?)\[\/h6\])ism", '<h6>$1</h6>', $text);
1406
1407                 // Check for paragraph
1408                 $text = preg_replace("(\[p\](.*?)\[\/p\])ism", '<p>$1</p>', $text);
1409
1410                 // Check for bold text
1411                 $text = preg_replace("(\[b\](.*?)\[\/b\])ism", '<strong>$1</strong>', $text);
1412
1413                 // Check for Italics text
1414                 $text = preg_replace("(\[i\](.*?)\[\/i\])ism", '<em>$1</em>', $text);
1415
1416                 // Check for Underline text
1417                 $text = preg_replace("(\[u\](.*?)\[\/u\])ism", '<u>$1</u>', $text);
1418
1419                 // Check for strike-through text
1420                 $text = preg_replace("(\[s\](.*?)\[\/s\])ism", '<s>$1</s>', $text);
1421
1422                 // Check for over-line text
1423                 $text = preg_replace("(\[o\](.*?)\[\/o\])ism", '<span class="overline">$1</span>', $text);
1424
1425                 // Check for colored text
1426                 $text = preg_replace("(\[color=(.*?)\](.*?)\[\/color\])ism", "<span style=\"color: $1;\">$2</span>", $text);
1427
1428                 // Check for sized text
1429                 // [size=50] --> font-size: 50px (with the unit).
1430                 if ($simple_html != 3) {
1431                         $text = preg_replace("(\[size=(\d*?)\](.*?)\[\/size\])ism", "<span style=\"font-size: $1px; line-height: initial;\">$2</span>", $text);
1432                         $text = preg_replace("(\[size=(.*?)\](.*?)\[\/size\])ism", "<span style=\"font-size: $1; line-height: initial;\">$2</span>", $text);
1433                 } else {
1434                         // Issue 2199: Diaspora doesn't interpret the construct above, nor the <small> or <big> element
1435                         $text = preg_replace("(\[size=(.*?)\](.*?)\[\/size\])ism", "$2", $text);
1436                 }
1437
1438
1439                 // Check for centered text
1440                 $text = preg_replace("(\[center\](.*?)\[\/center\])ism", "<div style=\"text-align:center;\">$1</div>", $text);
1441
1442                 // Check for list text
1443                 $text = str_replace("[*]", "<li>", $text);
1444
1445                 // Check for style sheet commands
1446                 $text = preg_replace_callback(
1447                         "(\[style=(.*?)\](.*?)\[\/style\])ism",
1448                         function ($match) {
1449                                 return "<span style=\"" . HTML::sanitizeCSS($match[1]) . ";\">" . $match[2] . "</span>";
1450                         },
1451                         $text
1452                 );
1453
1454                 // Check for CSS classes
1455                 $text = preg_replace_callback(
1456                         "(\[class=(.*?)\](.*?)\[\/class\])ism",
1457                         function ($match) {
1458                                 return "<span class=\"" . HTML::sanitizeCSS($match[1]) . "\">" . $match[2] . "</span>";
1459                         },
1460                         $text
1461                 );
1462
1463                 // handle nested lists
1464                 $endlessloop = 0;
1465
1466                 while ((((strpos($text, "[/list]") !== false) && (strpos($text, "[list") !== false)) ||
1467                                 ((strpos($text, "[/ol]") !== false) && (strpos($text, "[ol]") !== false)) ||
1468                                 ((strpos($text, "[/ul]") !== false) && (strpos($text, "[ul]") !== false)) ||
1469                                 ((strpos($text, "[/li]") !== false) && (strpos($text, "[li]") !== false))) && (++$endlessloop < 20)) {
1470                         $text = preg_replace("/\[list\](.*?)\[\/list\]/ism", '<ul class="listbullet" style="list-style-type: circle;">$1</ul>', $text);
1471                         $text = preg_replace("/\[list=\](.*?)\[\/list\]/ism", '<ul class="listnone" style="list-style-type: none;">$1</ul>', $text);
1472                         $text = preg_replace("/\[list=1\](.*?)\[\/list\]/ism", '<ul class="listdecimal" style="list-style-type: decimal;">$1</ul>', $text);
1473                         $text = preg_replace("/\[list=((?-i)i)\](.*?)\[\/list\]/ism", '<ul class="listlowerroman" style="list-style-type: lower-roman;">$2</ul>', $text);
1474                         $text = preg_replace("/\[list=((?-i)I)\](.*?)\[\/list\]/ism", '<ul class="listupperroman" style="list-style-type: upper-roman;">$2</ul>', $text);
1475                         $text = preg_replace("/\[list=((?-i)a)\](.*?)\[\/list\]/ism", '<ul class="listloweralpha" style="list-style-type: lower-alpha;">$2</ul>', $text);
1476                         $text = preg_replace("/\[list=((?-i)A)\](.*?)\[\/list\]/ism", '<ul class="listupperalpha" style="list-style-type: upper-alpha;">$2</ul>', $text);
1477                         $text = preg_replace("/\[ul\](.*?)\[\/ul\]/ism", '<ul class="listbullet" style="list-style-type: circle;">$1</ul>', $text);
1478                         $text = preg_replace("/\[ol\](.*?)\[\/ol\]/ism", '<ul class="listdecimal" style="list-style-type: decimal;">$1</ul>', $text);
1479                         $text = preg_replace("/\[li\](.*?)\[\/li\]/ism", '<li>$1</li>', $text);
1480                 }
1481
1482                 $text = preg_replace("/\[th\](.*?)\[\/th\]/sm", '<th>$1</th>', $text);
1483                 $text = preg_replace("/\[td\](.*?)\[\/td\]/sm", '<td>$1</td>', $text);
1484                 $text = preg_replace("/\[tr\](.*?)\[\/tr\]/sm", '<tr>$1</tr>', $text);
1485                 $text = preg_replace("/\[table\](.*?)\[\/table\]/sm", '<table>$1</table>', $text);
1486
1487                 $text = preg_replace("/\[table border=1\](.*?)\[\/table\]/sm", '<table border="1" >$1</table>', $text);
1488                 $text = preg_replace("/\[table border=0\](.*?)\[\/table\]/sm", '<table border="0" >$1</table>', $text);
1489
1490                 $text = str_replace('[hr]', '<hr />', $text);
1491
1492                 if (!$for_plaintext) {
1493                         $escaped = [];
1494
1495                         // Escaping BBCodes susceptible to contain rogue URL we don'' want the autolinker to catch
1496                         $text = preg_replace_callback('#\[(url|img|audio|video|youtube|vimeo|share|attachment|iframe|bookmark).+?\[/\1\]#ism',
1497                                 function ($matches) use (&$escaped) {
1498                                         $return = '{escaped-' . count($escaped) . '}';
1499                                         $escaped[] = $matches[0];
1500
1501                                         return $return;
1502                                 },
1503                                 $text
1504                         );
1505
1506                         // Autolinker for isolated URLs
1507                         $text = preg_replace(Strings::autoLinkRegEx(), '[url]$1[/url]', $text);
1508
1509                         // Restoring escaped blocks
1510                         $text = preg_replace_callback('/{escaped-([0-9]+)}/iU',
1511                                 function ($matches) use ($escaped) {
1512                                         return $escaped[intval($matches[1])] ?? $matches[0];
1513                                 },
1514                                 $text
1515                         );
1516                 }
1517
1518                 // This is actually executed in Item::prepareBody()
1519
1520                 $nosmile = strpos($text, '[nosmile]') !== false;
1521                 $text = str_replace('[nosmile]', '', $text);
1522
1523                 // Check for font change text
1524                 $text = preg_replace("/\[font=(.*?)\](.*?)\[\/font\]/sm", "<span style=\"font-family: $1;\">$2</span>", $text);
1525
1526                 // Declare the format for [spoiler] layout
1527                 $SpoilerLayout = '<details class="spoiler"><summary>' . L10n::t('Click to open/close') . '</summary>$1</details>';
1528
1529                 // Check for [spoiler] text
1530                 // handle nested quotes
1531                 $endlessloop = 0;
1532                 while ((strpos($text, "[/spoiler]") !== false) && (strpos($text, "[spoiler]") !== false) && (++$endlessloop < 20)) {
1533                         $text = preg_replace("/\[spoiler\](.*?)\[\/spoiler\]/ism", $SpoilerLayout, $text);
1534                 }
1535
1536                 // Check for [spoiler=Title] text
1537
1538                 // handle nested quotes
1539                 $endlessloop = 0;
1540                 while ((strpos($text, "[/spoiler]")!== false)  && (strpos($text, "[spoiler=") !== false) && (++$endlessloop < 20)) {
1541                         $text = preg_replace("/\[spoiler=[\"\']*(.*?)[\"\']*\](.*?)\[\/spoiler\]/ism",
1542                                 '<details class="spoiler"><summary>$1</summary>$2</details>',
1543                                 $text);
1544                 }
1545
1546                 // Declare the format for [quote] layout
1547                 $QuoteLayout = '<blockquote>$1</blockquote>';
1548
1549                 // Check for [quote] text
1550                 // handle nested quotes
1551                 $endlessloop = 0;
1552                 while ((strpos($text, "[/quote]") !== false) && (strpos($text, "[quote]") !== false) && (++$endlessloop < 20)) {
1553                         $text = preg_replace("/\[quote\](.*?)\[\/quote\]/ism", "$QuoteLayout", $text);
1554                 }
1555
1556                 // Check for [quote=Author] text
1557
1558                 $t_wrote = L10n::t('$1 wrote:');
1559
1560                 // handle nested quotes
1561                 $endlessloop = 0;
1562                 while ((strpos($text, "[/quote]")!== false)  && (strpos($text, "[quote=") !== false) && (++$endlessloop < 20)) {
1563                         $text = preg_replace("/\[quote=[\"\']*(.*?)[\"\']*\](.*?)\[\/quote\]/ism",
1564                                 "<p><strong class=".'"author"'.">" . $t_wrote . "</strong></p><blockquote>$2</blockquote>",
1565                                 $text);
1566                 }
1567
1568
1569                 // [img=widthxheight]image source[/img]
1570                 $text = preg_replace_callback(
1571                         "/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism",
1572                         function ($matches) use ($simple_html) {
1573                                 if (strpos($matches[3], "data:image/") === 0) {
1574                                         return $matches[0];
1575                                 }
1576
1577                                 $matches[3] = self::proxyUrl($matches[3], $simple_html);
1578                                 return "[img=" . $matches[1] . "x" . $matches[2] . "]" . $matches[3] . "[/img]";
1579                         },
1580                         $text
1581                 );
1582
1583                 $text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '<img src="$3" style="width: $1px;" >', $text);
1584                 $text = preg_replace("/\[zmg\=([0-9]*)x([0-9]*)\](.*?)\[\/zmg\]/ism", '<img class="zrl" src="$3" style="width: $1px;" >', $text);
1585
1586                 $text = preg_replace_callback("/\[img\=(.*?)\](.*?)\[\/img\]/ism",
1587                         function ($matches) use ($simple_html) {
1588                                 $matches[1] = self::proxyUrl($matches[1], $simple_html);
1589                                 $matches[2] = htmlspecialchars($matches[2], ENT_COMPAT);
1590                                 return '<img src="' . $matches[1] . '" alt="' . $matches[2] . '" title="' . $matches[2] . '">';
1591                         },
1592                         $text);
1593
1594                 // Images
1595                 // [img]pathtoimage[/img]
1596                 $text = preg_replace_callback(
1597                         "/\[img\](.*?)\[\/img\]/ism",
1598                         function ($matches) use ($simple_html) {
1599                                 if (strpos($matches[1], "data:image/") === 0) {
1600                                         return $matches[0];
1601                                 }
1602
1603                                 $matches[1] = self::proxyUrl($matches[1], $simple_html);
1604                                 return "[img]" . $matches[1] . "[/img]";
1605                         },
1606                         $text
1607                 );
1608
1609                 $text = preg_replace("/\[img\](.*?)\[\/img\]/ism", '<img src="$1" alt="' . L10n::t('Image/photo') . '" />', $text);
1610                 $text = preg_replace("/\[zmg\](.*?)\[\/zmg\]/ism", '<img src="$1" alt="' . L10n::t('Image/photo') . '" />', $text);
1611
1612                 $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);
1613                 $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 />', $text);
1614                 //$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);
1615
1616                 // Simplify "video" element
1617                 $text = preg_replace('(\[video.*?\ssrc\s?=\s?([^\s\]]+).*?\].*?\[/video\])ism', '[video]$1[/video]', $text);
1618
1619                 // Try to Oembed
1620                 if ($try_oembed) {
1621                         $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);
1622                         $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);
1623
1624                         $text = preg_replace_callback("/\[video\](.*?)\[\/video\]/ism", $try_oembed_callback, $text);
1625                         $text = preg_replace_callback("/\[audio\](.*?)\[\/audio\]/ism", $try_oembed_callback, $text);
1626                 } else {
1627                         $text = preg_replace("/\[video\](.*?)\[\/video\]/ism",
1628                                 '<a href="$1" target="_blank">$1</a>', $text);
1629                         $text = preg_replace("/\[audio\](.*?)\[\/audio\]/ism",
1630                                 '<a href="$1" target="_blank">$1</a>', $text);
1631                 }
1632
1633                 // html5 video and audio
1634
1635
1636                 if ($try_oembed) {
1637                         $text = preg_replace("/\[iframe\](.*?)\[\/iframe\]/ism", '<iframe src="$1" width="' . $a->videowidth . '" height="' . $a->videoheight . '"><a href="$1">$1</a></iframe>', $text);
1638                 } else {
1639                         $text = preg_replace("/\[iframe\](.*?)\[\/iframe\]/ism", '<a href="$1">$1</a>', $text);
1640                 }
1641
1642                 // Youtube extensions
1643                 if ($try_oembed) {
1644                         $text = preg_replace_callback("/\[youtube\](https?:\/\/www.youtube.com\/watch\?v\=.*?)\[\/youtube\]/ism", $try_oembed_callback, $text);
1645                         $text = preg_replace_callback("/\[youtube\](www.youtube.com\/watch\?v\=.*?)\[\/youtube\]/ism", $try_oembed_callback, $text);
1646                         $text = preg_replace_callback("/\[youtube\](https?:\/\/youtu.be\/.*?)\[\/youtube\]/ism", $try_oembed_callback, $text);
1647                 }
1648
1649                 $text = preg_replace("/\[youtube\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/youtube\]/ism", '[youtube]$1[/youtube]', $text);
1650                 $text = preg_replace("/\[youtube\]https?:\/\/www.youtube.com\/embed\/(.*?)\[\/youtube\]/ism", '[youtube]$1[/youtube]', $text);
1651                 $text = preg_replace("/\[youtube\]https?:\/\/youtu.be\/(.*?)\[\/youtube\]/ism", '[youtube]$1[/youtube]', $text);
1652
1653                 if ($try_oembed) {
1654                         $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);
1655                 } else {
1656                         $text = preg_replace("/\[youtube\]([A-Za-z0-9\-_=]+)(.*?)\[\/youtube\]/ism",
1657                                 '<a href="https://www.youtube.com/watch?v=$1" target="_blank">https://www.youtube.com/watch?v=$1</a>', $text);
1658                 }
1659
1660                 if ($try_oembed) {
1661                         $text = preg_replace_callback("/\[vimeo\](https?:\/\/player.vimeo.com\/video\/[0-9]+).*?\[\/vimeo\]/ism", $try_oembed_callback, $text);
1662                         $text = preg_replace_callback("/\[vimeo\](https?:\/\/vimeo.com\/[0-9]+).*?\[\/vimeo\]/ism", $try_oembed_callback, $text);
1663                 }
1664
1665                 $text = preg_replace("/\[vimeo\]https?:\/\/player.vimeo.com\/video\/([0-9]+)(.*?)\[\/vimeo\]/ism", '[vimeo]$1[/vimeo]', $text);
1666                 $text = preg_replace("/\[vimeo\]https?:\/\/vimeo.com\/([0-9]+)(.*?)\[\/vimeo\]/ism", '[vimeo]$1[/vimeo]', $text);
1667
1668                 if ($try_oembed) {
1669                         $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);
1670                 } else {
1671                         $text = preg_replace("/\[vimeo\]([0-9]+)(.*?)\[\/vimeo\]/ism",
1672                                 '<a href="https://vimeo.com/$1" target="_blank">https://vimeo.com/$1</a>', $text);
1673                 }
1674
1675                 // oembed tag
1676                 $text = OEmbed::BBCode2HTML($text);
1677
1678                 // Avoid triple linefeeds through oembed
1679                 $text = str_replace("<br style='clear:left'></span><br /><br />", "<br style='clear:left'></span><br />", $text);
1680
1681                 // If we found an event earlier, strip out all the event code and replace with a reformatted version.
1682                 // Replace the event-start section with the entire formatted event. The other bbcode is stripped.
1683                 // Summary (e.g. title) is required, earlier revisions only required description (in addition to
1684                 // start which is always required). Allow desc with a missing summary for compatibility.
1685
1686                 if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
1687                         $sub = Event::getHTML($ev, $simple_html);
1688
1689                         $text = preg_replace("/\[event\-summary\](.*?)\[\/event\-summary\]/ism", '', $text);
1690                         $text = preg_replace("/\[event\-description\](.*?)\[\/event\-description\]/ism", '', $text);
1691                         $text = preg_replace("/\[event\-start\](.*?)\[\/event\-start\]/ism", $sub, $text);
1692                         $text = preg_replace("/\[event\-finish\](.*?)\[\/event\-finish\]/ism", '', $text);
1693                         $text = preg_replace("/\[event\-location\](.*?)\[\/event\-location\]/ism", '', $text);
1694                         $text = preg_replace("/\[event\-adjust\](.*?)\[\/event\-adjust\]/ism", '', $text);
1695                         $text = preg_replace("/\[event\-id\](.*?)\[\/event\-id\]/ism", '', $text);
1696                 }
1697
1698                 // Replace non graphical smilies for external posts
1699                 if (!$nosmile && !$for_plaintext) {
1700                         $text = Smilies::replace($text);
1701                 }
1702
1703                 if (!$for_plaintext) {
1704                         if (in_array($simple_html, [7, 9])) {
1705                                 $text = preg_replace_callback("/\[url\](.*?)\[\/url\]/ism", 'self::convertUrlForActivityPubCallback', $text);
1706                                 $text = preg_replace_callback("/\[url\=(.*?)\](.*?)\[\/url\]/ism", 'self::convertUrlForActivityPubCallback', $text);
1707                         }
1708                 } else {
1709                         $text = preg_replace("(\[url\](.*?)\[\/url\])ism", " $1 ", $text);
1710                         $text = preg_replace_callback("&\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]&Usi", 'self::removePictureLinksCallback', $text);
1711                 }
1712
1713                 $text = str_replace(["\r","\n"], ['<br />', '<br />'], $text);
1714
1715                 // Remove all hashtag addresses
1716                 if ($simple_html && !in_array($simple_html, [3, 7, 9])) {
1717                         $text = preg_replace("/([#@!])\[url\=(.*?)\](.*?)\[\/url\]/ism", '$1$3', $text);
1718                 } elseif ($simple_html == 3) {
1719                         // The ! is converted to @ since Diaspora only understands the @
1720                         $text = preg_replace("/([@!])\[url\=(.*?)\](.*?)\[\/url\]/ism",
1721                                 '@<a href="$2">$3</a>',
1722                                 $text);
1723                 } elseif (in_array($simple_html, [7, 9])) {
1724                         $text = preg_replace("/([@!])\[url\=(.*?)\](.*?)\[\/url\]/ism",
1725                                 '$1<span class="vcard"><a href="$2" class="url u-url mention" title="$3"><span class="fn nickname mention">$3</span></a></span>',
1726                                 $text);
1727                 } elseif (!$simple_html) {
1728                         $text = preg_replace("/([@!])\[url\=(.*?)\](.*?)\[\/url\]/ism",
1729                                 '$1<a href="$2" class="userinfo mention" title="$3">$3</a>',
1730                                 $text);
1731                 }
1732
1733                 // Bookmarks in red - will be converted to bookmarks in friendica
1734                 $text = preg_replace("/#\^\[url\](.*?)\[\/url\]/ism", '[bookmark=$1]$1[/bookmark]', $text);
1735                 $text = preg_replace("/#\^\[url\=(.*?)\](.*?)\[\/url\]/ism", '[bookmark=$1]$2[/bookmark]', $text);
1736                 $text = preg_replace("/#\[url\=.*?\]\^\[\/url\]\[url\=(.*?)\](.*?)\[\/url\]/i",
1737                                         "[bookmark=$1]$2[/bookmark]", $text);
1738
1739                 if (in_array($simple_html, [2, 6, 7, 8])) {
1740                         $text = preg_replace_callback("/([^#@!])\[url\=([^\]]*)\](.*?)\[\/url\]/ism", "self::expandLinksCallback", $text);
1741                         //$Text = preg_replace("/[^#@!]\[url\=([^\]]*)\](.*?)\[\/url\]/ism", ' $2 [url]$1[/url]', $Text);
1742                         $text = preg_replace("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", ' $2 [url]$1[/url]',$text);
1743                 }
1744
1745                 if ($simple_html == 5) {
1746                         $text = preg_replace("/[^#@!]\[url\=(.*?)\](.*?)\[\/url\]/ism", '[url]$1[/url]', $text);
1747                 }
1748
1749                 // Perform URL Search
1750                 if ($try_oembed) {
1751                         $text = preg_replace_callback("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", $try_oembed_callback, $text);
1752                 }
1753
1754                 if ($simple_html == 5) {
1755                         $text = preg_replace("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", '[url]$1[/url]', $text);
1756                 } else {
1757                         $text = preg_replace("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", '[url=$1]$2[/url]', $text);
1758                 }
1759
1760                 // Handle Diaspora posts
1761                 $text = preg_replace_callback(
1762                         "&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1763                         function ($match) {
1764                                 return "[url=" . DI::baseUrl() . "/display/" . $match[1] . "]" . $match[2] . "[/url]";
1765                         }, $text
1766                 );
1767
1768                 $text = preg_replace_callback(
1769                         "&\[url=/people\?q\=(.*)\](.*)\[\/url\]&Usi",
1770                         function ($match) {
1771                                 return "[url=" . DI::baseUrl() . "/search?search=%40" . $match[1] . "]" . $match[2] . "[/url]";
1772                         }, $text
1773                 );
1774
1775                 // Server independent link to posts and comments
1776                 // See issue: https://github.com/diaspora/diaspora_federation/issues/75
1777                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1778                 $text = preg_replace($expression, DI::baseUrl()."/display/$1", $text);
1779
1780                 /* Tag conversion
1781                  * Supports:
1782                  * - #[url=<anything>]<term>[/url]
1783                  * - [url=<anything>]#<term>[/url]
1784                  */
1785                 $text = preg_replace_callback("/(?:#\[url\=[^\[\]]*\]|\[url\=[^\[\]]*\]#)(.*?)\[\/url\]/ism", function($matches) {
1786                         return '#<a href="'
1787                                 . DI::baseUrl() . '/search?tag=' . rawurlencode($matches[1])
1788                                 . '" class="tag" rel="tag" title="' . XML::escape($matches[1]) . '">'
1789                                 . XML::escape($matches[1])
1790                                 . '</a>';
1791                 }, $text);
1792
1793                 // We need no target="_blank" for local links
1794                 // convert links start with DI::baseUrl() as local link without the target="_blank" attribute
1795                 $escapedBaseUrl = preg_quote(DI::baseUrl(), '/');
1796                 $text = preg_replace("/\[url\](".$escapedBaseUrl.".*?)\[\/url\]/ism", '<a href="$1">$1</a>', $text);
1797                 $text = preg_replace("/\[url\=(".$escapedBaseUrl.".*?)\](.*?)\[\/url\]/ism", '<a href="$1">$2</a>', $text);
1798
1799                 $text = preg_replace("/\[url\](.*?)\[\/url\]/ism", '<a href="$1" target="_blank">$1</a>', $text);
1800                 $text = preg_replace("/\[url\=(.*?)\](.*?)\[\/url\]/ism", '<a href="$1" target="_blank">$2</a>', $text);
1801
1802                 // Red compatibility, though the link can't be authenticated on Friendica
1803                 $text = preg_replace("/\[zrl\=(.*?)\](.*?)\[\/zrl\]/ism", '<a href="$1" target="_blank">$2</a>', $text);
1804
1805
1806                 // we may need to restrict this further if it picks up too many strays
1807                 // link acct:user@host to a webfinger profile redirector
1808
1809                 $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);
1810
1811                 // Perform MAIL Search
1812                 $text = preg_replace("/\[mail\](.*?)\[\/mail\]/", '<a href="mailto:$1">$1</a>', $text);
1813                 $text = preg_replace("/\[mail\=(.*?)\](.*?)\[\/mail\]/", '<a href="mailto:$1">$2</a>', $text);
1814
1815                 // Unhide all [noparse] contained bbtags unspacefying them
1816                 // and triming the [noparse] tag.
1817
1818                 $text = preg_replace_callback("/\[noparse\](.*?)\[\/noparse\]/ism", 'self::unescapeNoparseCallback', $text);
1819                 $text = preg_replace_callback("/\[nobb\](.*?)\[\/nobb\]/ism", 'self::unescapeNoparseCallback', $text);
1820                 $text = preg_replace_callback("/\[pre\](.*?)\[\/pre\]/ism", 'self::unescapeNoparseCallback', $text);
1821
1822                 /// @todo What is the meaning of these lines?
1823                 $text = preg_replace('/\[\&amp\;([#a-z0-9]+)\;\]/', '&$1;', $text);
1824                 $text = preg_replace('/\&\#039\;/', '\'', $text);
1825
1826                 // Currently deactivated, it made problems with " inside of alt texts.
1827                 //$text = preg_replace('/\&quot\;/', '"', $text);
1828
1829                 // fix any escaped ampersands that may have been converted into links
1830                 $text = preg_replace('/\<([^>]*?)(src|href)=(.*?)\&amp\;(.*?)\>/ism', '<$1$2=$3&$4>', $text);
1831
1832                 // sanitizes src attributes (http and redir URLs for displaying in a web page, cid used for inline images in emails)
1833                 $allowed_src_protocols = ['//', 'http://', 'https://', 'redir/', 'cid:'];
1834
1835                 array_walk($allowed_src_protocols, function(&$value) { $value = preg_quote($value, '#');});
1836
1837                 $text = preg_replace('#<([^>]*?)(src)="(?!' . implode('|', $allowed_src_protocols) . ')(.*?)"(.*?)>#ism',
1838                                          '<$1$2=""$4 data-original-src="$3" class="invalid-src" title="' . L10n::t('Invalid source protocol') . '">', $text);
1839
1840                 // sanitize href attributes (only whitelisted protocols URLs)
1841                 // default value for backward compatibility
1842                 $allowed_link_protocols = Config::get('system', 'allowed_link_protocols', []);
1843
1844                 // Always allowed protocol even if config isn't set or not including it
1845                 $allowed_link_protocols[] = '//';
1846                 $allowed_link_protocols[] = 'http://';
1847                 $allowed_link_protocols[] = 'https://';
1848                 $allowed_link_protocols[] = 'redir/';
1849
1850                 array_walk($allowed_link_protocols, function(&$value) { $value = preg_quote($value, '#');});
1851
1852                 $regex = '#<([^>]*?)(href)="(?!' . implode('|', $allowed_link_protocols) . ')(.*?)"(.*?)>#ism';
1853                 $text = preg_replace($regex, '<$1$2="javascript:void(0)"$4 data-original-href="$3" class="invalid-href" title="' . L10n::t('Invalid link protocol') . '">', $text);
1854
1855                 // Shared content
1856                 $text = self::convertShare(
1857                         $text,
1858                         function (array $attributes, array $author_contact, $content, $is_quote_share) use ($simple_html) {
1859                                 return self::convertShareCallback($attributes, $author_contact, $content, $is_quote_share, $simple_html);
1860                         }
1861                 );
1862
1863                 if ($saved_image) {
1864                         $text = self::interpolateSavedImagesIntoItemBody($text, $saved_image);
1865                 }
1866
1867                 // Restore code blocks
1868                 $text = preg_replace_callback('/#codeblock-([0-9]+)#/iU',
1869                         function ($matches) use ($codeblocks) {
1870                                 $return = $matches[0];
1871                                 if (isset($codeblocks[intval($matches[1])])) {
1872                                         $return = $codeblocks[$matches[1]];
1873                                 }
1874                                 return $return;
1875                         },
1876                         $text
1877                 );
1878
1879                 // Clean up the HTML by loading and saving the HTML with the DOM.
1880                 // Bad structured html can break a whole page.
1881                 // For performance reasons do it only with activated item cache or at export.
1882                 if (!$try_oembed || (get_itemcachepath() != '')) {
1883                         $doc = new DOMDocument();
1884                         $doc->preserveWhiteSpace = false;
1885
1886                         $text = mb_convert_encoding($text, 'HTML-ENTITIES', "UTF-8");
1887
1888                         $doctype = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">';
1889                         $encoding = '<?xml encoding="UTF-8">';
1890                         @$doc->loadHTML($encoding . $doctype . '<html><body>' . $text . '</body></html>');
1891                         $doc->encoding = 'UTF-8';
1892                         $text = $doc->saveHTML();
1893                         $text = str_replace(['<html><body>', '</body></html>', $doctype, $encoding], ['', '', '', ''], $text);
1894
1895                         $text = str_replace('<br></li>', '</li>', $text);
1896
1897                         //$Text = mb_convert_encoding($Text, "UTF-8", 'HTML-ENTITIES');
1898                 }
1899
1900                 // Clean up some useless linebreaks in lists
1901                 //$Text = str_replace('<br /><ul', '<ul ', $Text);
1902                 //$Text = str_replace('</ul><br />', '</ul>', $Text);
1903                 //$Text = str_replace('</li><br />', '</li>', $Text);
1904                 //$Text = str_replace('<br /><li>', '<li>', $Text);
1905                 //$Text = str_replace('<br /><ul', '<ul ', $Text);
1906
1907                 Hook::callAll('bbcode', $text);
1908
1909                 return trim($text);
1910         }
1911
1912         /**
1913          * @brief Strips the "abstract" tag from the provided text
1914          *
1915          * @param string $text The text with BBCode
1916          * @return string The same text - but without "abstract" element
1917          */
1918         public static function stripAbstract($text)
1919         {
1920                 $text = preg_replace("/[\s|\n]*\[abstract\].*?\[\/abstract\][\s|\n]*/ism", '', $text);
1921                 $text = preg_replace("/[\s|\n]*\[abstract=.*?\].*?\[\/abstract][\s|\n]*/ism", '', $text);
1922
1923                 return $text;
1924         }
1925
1926         /**
1927          * @brief Returns the value of the "abstract" element
1928          *
1929          * @param string $text The text that maybe contains the element
1930          * @param string $addon The addon for which the abstract is meant for
1931          * @return string The abstract
1932          */
1933         public static function getAbstract($text, $addon = '')
1934         {
1935                 $abstract = '';
1936                 $abstracts = [];
1937                 $addon = strtolower($addon);
1938
1939                 if (preg_match_all("/\[abstract=(.*?)\](.*?)\[\/abstract\]/ism", $text, $results, PREG_SET_ORDER)) {
1940                         foreach ($results AS $result) {
1941                                 $abstracts[strtolower($result[1])] = $result[2];
1942                         }
1943                 }
1944
1945                 if (isset($abstracts[$addon])) {
1946                         $abstract = $abstracts[$addon];
1947                 }
1948
1949                 if ($abstract == '' && preg_match("/\[abstract\](.*?)\[\/abstract\]/ism", $text, $result)) {
1950                         $abstract = $result[1];
1951                 }
1952
1953                 return $abstract;
1954         }
1955
1956         /**
1957          * @brief Callback function to replace a Friendica style mention in a mention for Diaspora
1958          *
1959          * @param array $match Matching values for the callback
1960          *                     [1] = Mention type (! or @)
1961          *                     [2] = Name
1962          *                     [3] = Address
1963          * @return string Replaced mention
1964          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1965          * @throws \ImagickException
1966          */
1967         private static function bbCodeMention2DiasporaCallback($match)
1968         {
1969                 $contact = Contact::getDetailsByURL($match[3]);
1970
1971                 if (empty($contact['addr'])) {
1972                         $contact = Probe::uri($match[3]);
1973                 }
1974
1975                 if (empty($contact['addr'])) {
1976                         return $match[0];
1977                 }
1978
1979                 $mention = $match[1] . '{' . $match[2] . '; ' . $contact['addr'] . '}';
1980                 return $mention;
1981         }
1982
1983         /**
1984          * @brief Converts a BBCode text into Markdown
1985          *
1986          * This function converts a BBCode item body to be sent to Markdown-enabled
1987          * systems like Diaspora and Libertree
1988          *
1989          * @param string $text
1990          * @param bool   $for_diaspora Diaspora requires more changes than Libertree
1991          * @return string
1992          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1993          */
1994         public static function toMarkdown($text, $for_diaspora = true)
1995         {
1996                 $a = DI::app();
1997
1998                 $original_text = $text;
1999
2000                 // Since Diaspora is creating a summary for links, this function removes them before posting
2001                 if ($for_diaspora) {
2002                         $text = self::removeShareInformation($text);
2003                 }
2004
2005                 /**
2006                  * Transform #tags, strip off the [url] and replace spaces with underscore
2007                  */
2008                 $url_search_string = "^\[\]";
2009                 $text = preg_replace_callback("/#\[url\=([$url_search_string]*)\](.*?)\[\/url\]/i",
2010                         function ($matches) {
2011                                 return '#' . str_replace(' ', '_', $matches[2]);
2012                         },
2013                         $text
2014                 );
2015
2016                 // Converting images with size parameters to simple images. Markdown doesn't know it.
2017                 $text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $text);
2018
2019                 // Convert it to HTML - don't try oembed
2020                 if ($for_diaspora) {
2021                         $text = self::convert($text, false, 3);
2022
2023                         // Add all tags that maybe were removed
2024                         if (preg_match_all("/#\[url\=([$url_search_string]*)\](.*?)\[\/url\]/ism", $original_text, $tags)) {
2025                                 $tagline = '';
2026                                 foreach ($tags[2] as $tag) {
2027                                         $tag = html_entity_decode($tag, ENT_QUOTES, 'UTF-8');
2028                                         if (!strpos(html_entity_decode($text, ENT_QUOTES, 'UTF-8'), '#' . $tag)) {
2029                                                 $tagline .= '#' . $tag . ' ';
2030                                         }
2031                                 }
2032                                 $text = $text . " " . $tagline;
2033                         }
2034                 } else {
2035                         $text = self::convert($text, false, 4);
2036                 }
2037
2038                 // If a link is followed by a quote then there should be a newline before it
2039                 // Maybe we should make this newline at every time before a quote.
2040                 $text = str_replace(['</a><blockquote>'], ['</a><br><blockquote>'], $text);
2041
2042                 $stamp1 = microtime(true);
2043
2044                 // Now convert HTML to Markdown
2045                 $text = HTML::toMarkdown($text);
2046
2047                 DI::profiler()->saveTimestamp($stamp1, "parser", System::callstack());
2048
2049                 // Libertree has a problem with escaped hashtags.
2050                 $text = str_replace(['\#'], ['#'], $text);
2051
2052                 // Remove any leading or trailing whitespace, as this will mess up
2053                 // the Diaspora signature verification and cause the item to disappear
2054                 $text = trim($text);
2055
2056                 if ($for_diaspora) {
2057                         $url_search_string = "^\[\]";
2058                         $text = preg_replace_callback(
2059                                 "/([@!])\[(.*?)\]\(([$url_search_string]*?)\)/ism",
2060                                 ['self', 'bbCodeMention2DiasporaCallback'],
2061                                 $text
2062                         );
2063                 }
2064
2065                 Hook::callAll('bb2diaspora', $text);
2066
2067                 return $text;
2068         }
2069
2070         /**
2071      * @brief Pull out all #hashtags and @person tags from $string.
2072      *
2073      * We also get @person@domain.com - which would make
2074      * the regex quite complicated as tags can also
2075      * end a sentence. So we'll run through our results
2076      * and strip the period from any tags which end with one.
2077      * Returns array of tags found, or empty array.
2078      *
2079      * @param string $string Post content
2080      *
2081      * @return array List of tag and person names
2082      */
2083     public static function getTags($string)
2084     {
2085         $ret = [];
2086
2087         // Convert hashtag links to hashtags
2088         $string = preg_replace('/#\[url\=([^\[\]]*)\](.*?)\[\/url\]/ism', '#$2', $string);
2089
2090         // ignore anything in a code block
2091         $string = preg_replace('/\[code.*?\].*?\[\/code\]/sm', '', $string);
2092
2093         // Force line feeds at bbtags
2094         $string = str_replace(['[', ']'], ["\n[", "]\n"], $string);
2095
2096         // ignore anything in a bbtag
2097         $string = preg_replace('/\[(.*?)\]/sm', '', $string);
2098
2099         // Match full names against @tags including the space between first and last
2100         // We will look these up afterward to see if they are full names or not recognisable.
2101
2102         if (preg_match_all('/(@[^ \x0D\x0A,:?]+ [^ \x0D\x0A@,:?]+)([ \x0D\x0A@,:?]|$)/', $string, $matches)) {
2103             foreach ($matches[1] as $match) {
2104                 if (strstr($match, ']')) {
2105                     // we might be inside a bbcode color tag - leave it alone
2106                     continue;
2107                 }
2108
2109                 if (substr($match, -1, 1) === '.') {
2110                     $ret[] = substr($match, 0, -1);
2111                 } else {
2112                     $ret[] = $match;
2113                 }
2114             }
2115         }
2116
2117         // Otherwise pull out single word tags. These can be @nickname, @first_last
2118         // and #hash tags.
2119
2120         if (preg_match_all('/([!#@][^\^ \x0D\x0A,;:?]+)([ \x0D\x0A,;:?]|$)/', $string, $matches)) {
2121             foreach ($matches[1] as $match) {
2122                 if (strstr($match, ']')) {
2123                     // we might be inside a bbcode color tag - leave it alone
2124                     continue;
2125                 }
2126                 if (substr($match, -1, 1) === '.') {
2127                     $match = substr($match,0,-1);
2128                 }
2129                 // ignore strictly numeric tags like #1
2130                 if ((strpos($match, '#') === 0) && ctype_digit(substr($match, 1))) {
2131                     continue;
2132                 }
2133                 // try not to catch url fragments
2134                 if (strpos($string, $match) && preg_match('/[a-zA-z0-9\/]/', substr($string, strpos($string, $match) - 1, 1))) {
2135                     continue;
2136                 }
2137                 $ret[] = $match;
2138             }
2139         }
2140
2141         return $ret;
2142     }
2143 }