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, $include_link = true, $scale_replace = false)
 440         {
 441                 // Suppress "view full size"
 442                 if (intval(Config::get('system', 'no_view_full_size'))) {
 443                         $include_link = false;
 444                 }
 445
 446                 // Picture addresses can contain special characters
 447                 $s = $srctext;
 448
 449                 $matches = null;
 450                 $c = preg_match_all('/\[img.*?\](.*?)\[\/img\]/ism', $s, $matches, PREG_SET_ORDER);
 451                 if ($c) {
 452                         foreach ($matches as $mtch) {
 453                                 Logger::log('scale_external_image: ' . $mtch[1]);
 454
 455                                 $hostname = str_replace('www.', '', substr(DI::baseUrl(), strpos(DI::baseUrl(), '://') + 3));
 456                                 if (stristr($mtch[1], $hostname)) {
 457                                         continue;
 458                                 }
 459
 460                                 // $scale_replace, if passed, is an array of two elements. The
 461                                 // first is the name of the full-size image. The second is the
 462                                 // name of a remote, scaled-down version of the full size image.
 463                                 // This allows Friendica to display the smaller remote image if
 464                                 // one exists, while still linking to the full-size image
 465                                 if ($scale_replace) {
 466                                         $scaled = str_replace($scale_replace[0], $scale_replace[1], $mtch[1]);
 467                                 } else {
 468                                         $scaled = $mtch[1];
 469                                 }
 470                                 $i = Network::fetchUrl($scaled);
 471                                 if (!$i) {
 472                                         return $srctext;
 473                                 }
 474
 475                                 // guess mimetype from headers or filename
 476                                 $type = Images::guessType($mtch[1], true);
 477
 478                                 if ($i) {
 479                                         $Image = new Image($i, $type);
 480                                         if ($Image->isValid()) {
 481                                                 $orig_width = $Image->getWidth();
 482                                                 $orig_height = $Image->getHeight();
 483
 484                                                 if ($orig_width > 640 || $orig_height > 640) {
 485                                                         $Image->scaleDown(640);
 486                                                         $new_width = $Image->getWidth();
 487                                                         $new_height = $Image->getHeight();
 488                                                         Logger::log('scale_external_images: ' . $orig_width . '->' . $new_width . 'w ' . $orig_height . '->' . $new_height . 'h' . ' match: ' . $mtch[0], Logger::DEBUG);
 489                                                         $s = str_replace(
 490                                                                 $mtch[0],
 491                                                                 '[img=' . $new_width . 'x' . $new_height. ']' . $scaled . '[/img]'
 492                                                                 . "\n" . (($include_link)
 493                                                                         ? '[url=' . $mtch[1] . ']' . L10n::t('view full size') . '[/url]' . "\n"
 494                                                                         : ''),
 495                                                                 $s
 496                                                         );
 497                                                         Logger::log('scale_external_images: new string: ' . $s, Logger::DEBUG);
 498                                                 }
 499                                         }
 500                                 }
 501                         }
 502                 }
 503
 504                 return $s;
 505         }
 506
 507         /**
 508          * The purpose of this function is to apply system message length limits to
 509          * imported messages without including any embedded photos in the length
 510          *
 511          * @brief Truncates imported message body string length to max_import_size
 512          * @param string $body
 513          * @return string
 514          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 515          */
 516         public static function limitBodySize($body)
 517         {
 518                 $maxlen = Config::get('config', 'max_import_size', 0);
 519
 520                 // If the length of the body, including the embedded images, is smaller
 521                 // than the maximum, then don't waste time looking for the images
 522                 if ($maxlen && (strlen($body) > $maxlen)) {
 523
 524                         Logger::log('the total body length exceeds the limit', Logger::DEBUG);
 525
 526                         $orig_body = $body;
 527                         $new_body = '';
 528                         $textlen = 0;
 529
 530                         $img_start = strpos($orig_body, '[img');
 531                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 532                         $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 533                         while (($img_st_close !== false) && ($img_end !== false)) {
 534
 535                                 $img_st_close++; // make it point to AFTER the closing bracket
 536                                 $img_end += $img_start;
 537                                 $img_end += strlen('[/img]');
 538
 539                                 if (!strcmp(substr($orig_body, $img_start + $img_st_close, 5), 'data:')) {
 540                                         // This is an embedded image
 541
 542                                         if (($textlen + $img_start) > $maxlen) {
 543                                                 if ($textlen < $maxlen) {
 544                                                         Logger::log('the limit happens before an embedded image', Logger::DEBUG);
 545                                                         $new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 546                                                         $textlen = $maxlen;
 547                                                 }
 548                                         } else {
 549                                                 $new_body = $new_body . substr($orig_body, 0, $img_start);
 550                                                 $textlen += $img_start;
 551                                         }
 552
 553                                         $new_body = $new_body . substr($orig_body, $img_start, $img_end - $img_start);
 554                                 } else {
 555
 556                                         if (($textlen + $img_end) > $maxlen) {
 557                                                 if ($textlen < $maxlen) {
 558                                                         Logger::log('the limit happens before the end of a non-embedded image', Logger::DEBUG);
 559                                                         $new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 560                                                         $textlen = $maxlen;
 561                                                 }
 562                                         } else {
 563                                                 $new_body = $new_body . substr($orig_body, 0, $img_end);
 564                                                 $textlen += $img_end;
 565                                         }
 566                                 }
 567                                 $orig_body = substr($orig_body, $img_end);
 568
 569                                 if ($orig_body === false) {
 570                                         // in case the body ends on a closing image tag
 571                                         $orig_body = '';
 572                                 }
 573
 574                                 $img_start = strpos($orig_body, '[img');
 575                                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 576                                 $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 577                         }
 578
 579                         if (($textlen + strlen($orig_body)) > $maxlen) {
 580                                 if ($textlen < $maxlen) {
 581                                         Logger::log('the limit happens after the end of the last image', Logger::DEBUG);
 582                                         $new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 583                                 }
 584                         } else {
 585                                 Logger::log('the text size with embedded images extracted did not violate the limit', Logger::DEBUG);
 586                                 $new_body = $new_body . $orig_body;
 587                         }
 588
 589                         return $new_body;
 590                 } else {
 591                         return $body;
 592                 }
 593         }
 594
 595         /**
 596          * Processes [attachment] tags
 597          *
 598          * Note: Can produce a [bookmark] tag in the returned string
 599          *
 600          * @brief Processes [attachment] tags
 601          * @param string   $text
 602          * @param bool|int $simplehtml
 603          * @param bool     $tryoembed
 604          * @return string
 605          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 606          */
 607         private static function convertAttachment($text, $simplehtml = false, $tryoembed = true)
 608         {
 609                 $data = self::getAttachmentData($text);
 610                 if (empty($data) || empty($data['url'])) {
 611                         return $text;
 612                 }
 613
 614                 if (isset($data['title'])) {
 615                         $data['title'] = strip_tags($data['title']);
 616                         $data['title'] = str_replace(['http://', 'https://'], '', $data['title']);
 617                 } else {
 618                         $data['title'] = null;
 619                 }
 620
 621                 if (((strpos($data['text'], "[img=") !== false) || (strpos($data['text'], "[img]") !== false) || Config::get('system', 'always_show_preview')) && !empty($data['image'])) {
 622                         $data['preview'] = $data['image'];
 623                         $data['image'] = '';
 624                 }
 625
 626                 $return = '';
 627                 try {
 628                         if ($tryoembed && OEmbed::isAllowedURL($data['url'])) {
 629                                 $return = OEmbed::getHTML($data['url'], $data['title']);
 630                         } else {
 631                                 throw new Exception('OEmbed is disabled for this attachment.');
 632                         }
 633                 } catch (Exception $e) {
 634                         $data['title'] = ($data['title'] ?? '') ?: $data['url'];
 635
 636                         if ($simplehtml != 4) {
 637                                 $return = sprintf('<div class="type-%s">', $data['type']);
 638                         }
 639
 640                         if (!empty($data['title']) && !empty($data['url'])) {
 641                                 if (!empty($data['image']) && empty($data['text']) && ($data['type'] == 'photo')) {
 642                                         $return .= sprintf('<a href="%s" target="_blank"><img src="%s" alt="" title="%s" class="attachment-image" /></a>', $data['url'], self::proxyUrl($data['image'], $simplehtml), $data['title']);
 643                                 } else {
 644                                         if (!empty($data['image'])) {
 645                                                 $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), $data['title']);
 646                                         } elseif (!empty($data['preview'])) {
 647                                                 $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']);
 648                                         }
 649                                         $return .= sprintf('<h4><a href="%s">%s</a></h4>', $data['url'], $data['title']);
 650                                 }
 651                         }
 652
 653                         if (!empty($data['description']) && $data['description'] != $data['title']) {
 654                                 // Sanitize the HTML by converting it to BBCode
 655                                 $bbcode = HTML::toBBCode($data['description']);
 656                                 $return .= sprintf('<blockquote>%s</blockquote>', trim(self::convert($bbcode)));
 657                         }
 658
 659                         if (!empty($data['url'])) {
 660                                 $return .= sprintf('<sup><a href="%s">%s</a></sup>', $data['url'], parse_url($data['url'], PHP_URL_HOST));
 661                         }
 662
 663                         if ($simplehtml != 4) {
 664                                 $return .= '</div>';
 665                         }
 666                 }
 667
 668                 return trim(($data['text'] ?? '') . ' ' . $return . ' ' . ($data['after'] ?? ''));
 669         }
 670
 671         public static function removeShareInformation($Text, $plaintext = false, $nolink = false)
 672         {
 673                 $data = self::getAttachmentData($Text);
 674
 675                 if (!$data) {
 676                         return $Text;
 677                 } elseif ($nolink) {
 678                         return $data['text'] . ($data['after'] ?? '');
 679                 }
 680
 681                 $title = htmlentities($data['title'] ?? '', ENT_QUOTES, 'UTF-8', false);
 682                 $text = htmlentities($data['text'], ENT_QUOTES, 'UTF-8', false);
 683                 if ($plaintext || (($title != '') && strstr($text, $title))) {
 684                         $data['title'] = $data['url'];
 685                 } elseif (($text != '') && strstr($title, $text)) {
 686                         $data['text'] = $data['title'];
 687                         $data['title'] = $data['url'];
 688                 }
 689
 690                 if (empty($data['text']) && !empty($data['title']) && empty($data['url'])) {
 691                         return $data['title'] . $data['after'];
 692                 }
 693
 694                 // If the link already is included in the post, don't add it again
 695                 if (!empty($data['url']) && strpos($data['text'], $data['url'])) {
 696                         return $data['text'] . $data['after'];
 697                 }
 698
 699                 $text = $data['text'];
 700
 701                 if (!empty($data['url']) && !empty($data['title'])) {
 702                         $text .= "\n[url=" . $data['url'] . ']' . $data['title'] . '[/url]';
 703                 } elseif (!empty($data['url'])) {
 704                         $text .= "\n[url]" . $data['url'] . '[/url]';
 705                 }
 706
 707                 return $text . "\n" . $data['after'];
 708         }
 709
 710         /**
 711          * Converts [url] BBCodes in a format that looks fine on Mastodon. (callback function)
 712          *
 713          * @brief Converts [url] BBCodes in a format that looks fine on Mastodon. (callback function)
 714          * @param array $match Array with the matching values
 715          * @return string reformatted link including HTML codes
 716          */
 717         private static function convertUrlForActivityPubCallback($match)
 718         {
 719                 $url = $match[1];
 720
 721                 if (isset($match[2]) && ($match[1] != $match[2])) {
 722                         return $match[0];
 723                 }
 724
 725                 $parts = parse_url($url);
 726                 if (!isset($parts['scheme'])) {
 727                         return $match[0];
 728                 }
 729
 730                 return self::convertUrlForActivityPub($url);
 731         }
 732
 733         /**
 734          * @brief Converts [url] BBCodes in a format that looks fine on ActivityPub systems.
 735          * @param string $url URL that is about to be reformatted
 736          * @return string reformatted link including HTML codes
 737          */
 738         private static function convertUrlForActivityPub($url)
 739         {
 740                 $html = '<a href="%s" target="_blank">%s</a>';
 741                 return sprintf($html, $url, self::getStyledURL($url));
 742         }
 743
 744         /**
 745          * Converts an URL in a nicer format (without the scheme and possibly shortened)
 746          * @param string $url URL that is about to be reformatted
 747          * @return string reformatted link
 748          */
 749         private static function getStyledURL($url)
 750         {
 751                 $parts = parse_url($url);
 752                 $scheme = $parts['scheme'] . '://';
 753                 $styled_url = str_replace($scheme, '', $url);
 754
 755                 if (strlen($styled_url) > 30) {
 756                         $styled_url = substr($styled_url, 0, 30) . "…";
 757                 }
 758
 759                 return $styled_url;
 760         }
 761
 762         /*
 763          * [noparse][i]italic[/i][/noparse] turns into
 764          * [noparse][ i ]italic[ /i ][/noparse],
 765          * to hide them from parser.
 766          */
 767         private static function escapeNoparseCallback($match)
 768         {
 769                 $whole_match = $match[0];
 770                 $captured = $match[1];
 771                 $spacefied = preg_replace("/\[(.*?)\]/", "[ $1 ]", $captured);
 772                 $new_str = str_replace($captured, $spacefied, $whole_match);
 773                 return $new_str;
 774         }
 775
 776         /*
 777          * The previously spacefied [noparse][ i ]italic[ /i ][/noparse],
 778          * now turns back and the [noparse] tags are trimed
 779          * returning [i]italic[/i]
 780          */
 781         private static function unescapeNoparseCallback($match)
 782         {
 783                 $captured = $match[1];
 784                 $unspacefied = preg_replace("/\[ (.*?)\ ]/", "[$1]", $captured);
 785                 return $unspacefied;
 786         }
 787
 788         /**
 789          * Returns the bracket character positions of a set of opening and closing BBCode tags, optionally skipping first
 790          * occurrences
 791          *
 792          * @param string $text        Text to search
 793          * @param string $name        Tag name
 794          * @param int    $occurrences Number of first occurrences to skip
 795          * @return boolean|array
 796          */
 797         public static function getTagPosition($text, $name, $occurrences = 0)
 798         {
 799                 if ($occurrences < 0) {
 800                         $occurrences = 0;
 801                 }
 802
 803                 $start_open = -1;
 804                 for ($i = 0; $i <= $occurrences; $i++) {
 805                         if ($start_open !== false) {
 806                                 $start_open = strpos($text, '[' . $name, $start_open + 1); // allow [name= type tags
 807                         }
 808                 }
 809
 810                 if ($start_open === false) {
 811                         return false;
 812                 }
 813
 814                 $start_equal = strpos($text, '=', $start_open);
 815                 $start_close = strpos($text, ']', $start_open);
 816
 817                 if ($start_close === false) {
 818                         return false;
 819                 }
 820
 821                 $start_close++;
 822
 823                 $end_open = strpos($text, '[/' . $name . ']', $start_close);
 824
 825                 if ($end_open === false) {
 826                         return false;
 827                 }
 828
 829                 $res = [
 830                         'start' => [
 831                                 'open' => $start_open,
 832                                 'close' => $start_close
 833                         ],
 834                         'end' => [
 835                                 'open' => $end_open,
 836                                 'close' => $end_open + strlen('[/' . $name . ']')
 837                         ],
 838                 ];
 839
 840                 if ($start_equal !== false) {
 841                         $res['start']['equal'] = $start_equal + 1;
 842                 }
 843
 844                 return $res;
 845         }
 846
 847         /**
 848          * Performs a preg_replace within the boundaries of all named BBCode tags in a text
 849          *
 850          * @param string $pattern Preg pattern string
 851          * @param string $replace Preg replace string
 852          * @param string $name    BBCode tag name
 853          * @param string $text    Text to search
 854          * @return string
 855          */
 856         public static function pregReplaceInTag($pattern, $replace, $name, $text)
 857         {
 858                 $occurrences = 0;
 859                 $pos = self::getTagPosition($text, $name, $occurrences);
 860                 while ($pos !== false && $occurrences++ < 1000) {
 861                         $start = substr($text, 0, $pos['start']['open']);
 862                         $subject = substr($text, $pos['start']['open'], $pos['end']['close'] - $pos['start']['open']);
 863                         $end = substr($text, $pos['end']['close']);
 864                         if ($end === false) {
 865                                 $end = '';
 866                         }
 867
 868                         $subject = preg_replace($pattern, $replace, $subject);
 869                         $text = $start . $subject . $end;
 870
 871                         $pos = self::getTagPosition($text, $name, $occurrences);
 872                 }
 873
 874                 return $text;
 875         }
 876
 877         private static function extractImagesFromItemBody($body)
 878         {
 879                 $saved_image = [];
 880                 $orig_body = $body;
 881                 $new_body = '';
 882
 883                 $cnt = 0;
 884                 $img_start = strpos($orig_body, '[img');
 885                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 886                 $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 887                 while (($img_st_close !== false) && ($img_end !== false)) {
 888                         $img_st_close++; // make it point to AFTER the closing bracket
 889                         $img_end += $img_start;
 890
 891                         if (!strcmp(substr($orig_body, $img_start + $img_st_close, 5), 'data:')) {
 892                                 // This is an embedded image
 893                                 $saved_image[$cnt] = substr($orig_body, $img_start + $img_st_close, $img_end - ($img_start + $img_st_close));
 894                                 $new_body = $new_body . substr($orig_body, 0, $img_start) . '[$#saved_image' . $cnt . '#$]';
 895
 896                                 $cnt++;
 897                         } else {
 898                                 $new_body = $new_body . substr($orig_body, 0, $img_end + strlen('[/img]'));
 899                         }
 900
 901                         $orig_body = substr($orig_body, $img_end + strlen('[/img]'));
 902
 903                         if ($orig_body === false) {
 904                                 // in case the body ends on a closing image tag
 905                                 $orig_body = '';
 906                         }
 907
 908                         $img_start = strpos($orig_body, '[img');
 909                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
 910                         $img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
 911                 }
 912
 913                 $new_body = $new_body . $orig_body;
 914
 915                 return ['body' => $new_body, 'images' => $saved_image];
 916         }
 917
 918         private static function interpolateSavedImagesIntoItemBody($body, array $images)
 919         {
 920                 $newbody = $body;
 921
 922                 $cnt = 0;
 923                 foreach ($images as $image) {
 924                         // We're depending on the property of 'foreach' (specified on the PHP website) that
 925                         // it loops over the array starting from the first element and going sequentially
 926                         // to the last element
 927                         $newbody = str_replace('[$#saved_image' . $cnt . '#$]',
 928                                 '<img src="' . self::proxyUrl($image) . '" alt="' . L10n::t('Image/photo') . '" />', $newbody);
 929                         $cnt++;
 930                 }
 931
 932                 return $newbody;
 933         }
 934
 935         /**
 936          * This function converts a [share] block to text according to a provided callback function whose signature is:
 937          *
 938          * function(array $attributes, array $author_contact, string $content, boolean $is_quote_share): string
 939          *
 940          * Where:
 941          * - $attributes is an array of attributes of the [share] block itself. Missing keys will be completed by the contact
 942          * data lookup
 943          * - $author_contact is a contact record array
 944          * - $content is the inner content of the [share] block
 945          * - $is_quote_share indicates whether there's any content before the [share] block
 946          * - Return value is the string that should replace the [share] block in the provided text
 947          *
 948          * This function is intended to be used by addon connector to format a share block like the target network is expecting it.
 949          *
 950          * @param  string   $text     A BBCode string
 951          * @param  callable $callback
 952          * @return string The BBCode string with all [share] blocks replaced
 953          */
 954         public static function convertShare($text, callable $callback)
 955         {
 956                 $return = preg_replace_callback(
 957                         "/(.*?)\[share(.*?)\](.*)\[\/share\]/ism",
 958                         function ($match) use ($callback) {
 959                                 $attribute_string = $match[2];
 960                                 $attributes = [];
 961                                 foreach (['author', 'profile', 'avatar', 'link', 'posted'] as $field) {
 962                                         preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches);
 963                                         $attributes[$field] = html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8');
 964                                 }
 965
 966                                 // We only call this so that a previously unknown contact can be added.
 967                                 // This is important for the function "Model\Contact::getDetailsByURL()".
 968                                 // This function then can fetch an entry from the contact table.
 969                                 $default['url'] = $attributes['profile'];
 970
 971                                 if (!empty($attributes['author'])) {
 972                                         $default['name'] = $attributes['author'];
 973                                 }
 974
 975                                 if (!empty($attributes['avatar'])) {
 976                                         $default['photo'] = $attributes['avatar'];
 977                                 }
 978
 979                                 Contact::getIdForURL($attributes['profile'], 0, true, $default);
 980
 981                                 $author_contact = Contact::getDetailsByURL($attributes['profile']);
 982                                 $author_contact['addr'] = ($author_contact['addr']  ?? '') ?: Protocol::getAddrFromProfileUrl($attributes['profile']);
 983
 984                                 $attributes['author']   = ($author_contact['name']  ?? '') ?: $attributes['author'];
 985                                 $attributes['avatar']   = ($author_contact['micro'] ?? '') ?: $attributes['avatar'];
 986                                 $attributes['profile']  = ($author_contact['url']   ?? '') ?: $attributes['profile'];
 987
 988                                 if ($attributes['avatar']) {
 989                                         $attributes['avatar'] = ProxyUtils::proxifyUrl($attributes['avatar'], false, ProxyUtils::SIZE_THUMB);
 990                                 }
 991
 992                                 return $match[1] . $callback($attributes, $author_contact, $match[3], trim($match[1]) != '');
 993                         },
 994                         $text
 995                 );
 996
 997                 return $return;
 998         }
 999
1000         /**
1001          * Default [share] tag conversion callback
1002          *
1003          * Note: Can produce a [bookmark] tag in the output
1004          *
1005          * @see BBCode::convertShare()
1006          * @param array   $attributes     [share] block attribute values
1007          * @param array   $author_contact Contact row of the shared author
1008          * @param string  $content        Inner content of the [share] block
1009          * @param boolean $is_quote_share Whether there is content before the [share] block
1010          * @param integer $simplehtml     Mysterious integer value depending on the target network/formatting style
1011          * @return string
1012          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1013          */
1014         private static function convertShareCallback(array $attributes, array $author_contact, $content, $is_quote_share, $simplehtml)
1015         {
1016                 $mention = Protocol::formatMention($attributes['profile'], $attributes['author']);
1017
1018                 switch ($simplehtml) {
1019                         case 1:
1020                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' <a href="' . $attributes['profile'] . '">' . $mention . '</a>: </p>' . "\n" . '«' . $content . '»';
1021                                 break;
1022                         case 2:
1023                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' ' . $author_contact['addr'] . ': </p>' . "\n" . $content;
1024                                 break;
1025                         case 3: // Diaspora
1026                                 if (stripos(Strings::normaliseLink($attributes['link']), 'http://twitter.com/') === 0) {
1027                                         $text = ($is_quote_share? '<hr />' : '') . '<p><a href="' . $attributes['link'] . '">' . $attributes['link'] . '</a></p>' . "\n";
1028                                 } else {
1029                                         $headline = '<p><b>♲ <a href="' . $attributes['profile'] . '">' . $attributes['author'] . '</a>:</b></p>' . "\n";
1030
1031                                         if (!empty($attributes['posted']) && !empty($attributes['link'])) {
1032                                                 $headline = '<p><b>♲ <a href="' . $attributes['profile'] . '">' . $attributes['author'] . '</a></b> - <a href="' . $attributes['link'] . '">' . $attributes['posted'] . ' GMT</a></p>' . "\n";
1033                                         }
1034
1035                                         $text = ($is_quote_share? '<hr />' : '') . $headline . '<blockquote>' . trim($content) . '</blockquote>' . "\n";
1036
1037                                         if (empty($attributes['posted']) && !empty($attributes['link'])) {
1038                                                 $text .= '<p><a href="' . $attributes['link'] . '">[Source]</a></p>' . "\n";
1039                                         }
1040                                 }
1041
1042                                 break;
1043                         case 4:
1044                                 $headline = '<p><b>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8');
1045                                 $headline .= L10n::t('<a href="%1$s" target="_blank">%2$s</a> %3$s', $attributes['link'], $mention, $attributes['posted']);
1046                                 $headline .= ':</b></p>' . "\n";
1047
1048                                 $text = ($is_quote_share? '<hr />' : '') . $headline . '<blockquote class="shared_content">' . trim($content) . '</blockquote>' . "\n";
1049
1050                                 break;
1051                         case 5:
1052                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' ' . $author_contact['addr'] . ': </p>' . "\n" . $content;
1053                                 break;
1054                         case 7: // statusnet/GNU Social
1055                                 $text = ($is_quote_share? '<br />' : '') . '<p>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . ' @' . $author_contact['addr'] . ': ' . $content . '</p>' . "\n";
1056                                 break;
1057                         case 9: // ActivityPub
1058                                 $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>';
1059                                 $text = '<div><a href="' . $attributes['link'] . '">' . html_entity_decode('&#x2672;', ENT_QUOTES, 'UTF-8') . '</a> ' . $author . '<blockquote>' . $content . '</blockquote></div>' . "\n";
1060                                 break;
1061                         default:
1062                                 // Transforms quoted tweets in rich attachments to avoid nested tweets
1063                                 if (stripos(Strings::normaliseLink($attributes['link']), 'http://twitter.com/') === 0 && OEmbed::isAllowedURL($attributes['link'])) {
1064                                         try {
1065                                                 $text = ($is_quote_share? '<br />' : '') . OEmbed::getHTML($attributes['link']);
1066                                         } catch (Exception $e) {
1067                                                 $text = ($is_quote_share? '<br />' : '') . sprintf('[bookmark=%s]%s[/bookmark]', $attributes['link'], $content);
1068                                         }
1069                                 } else {
1070                                         $text = ($is_quote_share? "\n" : '');
1071
1072                                         $tpl = Renderer::getMarkupTemplate('shared_content.tpl');
1073                                         $text .= Renderer::replaceMacros($tpl, [
1074                                                 '$profile' => $attributes['profile'],
1075                                                 '$avatar'  => $attributes['avatar'],
1076                                                 '$author'  => $attributes['author'],
1077                                                 '$link'    => $attributes['link'],
1078                                                 '$posted'  => $attributes['posted'],
1079                                                 '$content' => trim($content)
1080                                         ]);
1081                                 }
1082                                 break;
1083                 }
1084
1085                 return $text;
1086         }
1087
1088         private static function removePictureLinksCallback($match)
1089         {
1090                 $cache_key = 'remove:' . $match[1];
1091                 $text = Cache::get($cache_key);
1092
1093                 if (is_null($text)) {
1094                         $a = DI::app();
1095
1096                         $stamp1 = microtime(true);
1097
1098                         $ch = @curl_init($match[1]);
1099                         @curl_setopt($ch, CURLOPT_NOBODY, true);
1100                         @curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
1101                         @curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
1102                         @curl_exec($ch);
1103                         $curl_info = @curl_getinfo($ch);
1104
1105                         DI::profiler()->saveTimestamp($stamp1, "network", System::callstack());
1106
1107                         if (substr($curl_info['content_type'], 0, 6) == 'image/') {
1108                                 $text = "[url=" . $match[1] . ']' . $match[1] . "[/url]";
1109                         } else {
1110                                 $text = "[url=" . $match[2] . ']' . $match[2] . "[/url]";
1111
1112                                 // if its not a picture then look if its a page that contains a picture link
1113                                 $body = Network::fetchUrl($match[1]);
1114
1115                                 $doc = new DOMDocument();
1116                                 @$doc->loadHTML($body);
1117                                 $xpath = new DOMXPath($doc);
1118                                 $list = $xpath->query("//meta[@name]");
1119                                 foreach ($list as $node) {
1120                                         $attr = [];
1121
1122                                         if ($node->attributes->length) {
1123                                                 foreach ($node->attributes as $attribute) {
1124                                                         $attr[$attribute->name] = $attribute->value;
1125                                                 }
1126                                         }
1127
1128                                         if (strtolower($attr['name']) == 'twitter:image') {
1129                                                 $text = '[url=' . $attr['content'] . ']' . $attr['content'] . '[/url]';
1130                                         }
1131                                 }
1132                         }
1133                         Cache::set($cache_key, $text);
1134                 }
1135
1136                 return $text;
1137         }
1138
1139         private static function expandLinksCallback($match)
1140         {
1141                 if (($match[3] == '') || ($match[2] == $match[3]) || stristr($match[2], $match[3])) {
1142                         return ($match[1] . "[url]" . $match[2] . "[/url]");
1143                 } else {
1144                         return ($match[1] . $match[3] . " [url]" . $match[2] . "[/url]");
1145                 }
1146         }
1147
1148         private static function cleanPictureLinksCallback($match)
1149         {
1150                 $a = DI::app();
1151
1152                 // When the picture link is the own photo path then we can avoid fetching the link
1153                 $own_photo_url = preg_quote(Strings::normaliseLink(DI::baseUrl()->get()) . '/photos/');
1154                 if (preg_match('|' . $own_photo_url . '.*?/image/|', Strings::normaliseLink($match[1]))) {
1155                         if (!empty($match[3])) {
1156                                 $text = '[img=' . str_replace('-1.', '-0.', $match[2]) . ']' . $match[3] . '[/img]';
1157                         } else {
1158                                 $text = '[img]' . str_replace('-1.', '-0.', $match[2]) . '[/img]';
1159                         }
1160                         return $text;
1161                 }
1162
1163                 $cache_key = 'clean:' . $match[1];
1164                 $text = Cache::get($cache_key);
1165                 if (!is_null($text)) {
1166                         return $text;
1167                 }
1168
1169                 // Only fetch the header, not the content
1170                 $stamp1 = microtime(true);
1171
1172                 $ch = @curl_init($match[1]);
1173                 @curl_setopt($ch, CURLOPT_NOBODY, true);
1174                 @curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
1175                 @curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
1176                 @curl_exec($ch);
1177                 $curl_info = @curl_getinfo($ch);
1178
1179                 DI::profiler()->saveTimestamp($stamp1, "network", System::callstack());
1180
1181                 // if its a link to a picture then embed this picture
1182                 if (substr($curl_info['content_type'], 0, 6) == 'image/') {
1183                         $text = '[img]' . $match[1] . '[/img]';
1184                 } else {
1185                         if (!empty($match[3])) {
1186                                 $text = '[img=' . $match[2] . ']' . $match[3] . '[/img]';
1187                         } else {
1188                                 $text = '[img]' . $match[2] . '[/img]';
1189                         }
1190
1191                         // if its not a picture then look if its a page that contains a picture link
1192                         $body = Network::fetchUrl($match[1]);
1193
1194                         $doc = new DOMDocument();
1195                         @$doc->loadHTML($body);
1196                         $xpath = new DOMXPath($doc);
1197                         $list = $xpath->query("//meta[@name]");
1198                         foreach ($list as $node) {
1199                                 $attr = [];
1200                                 if ($node->attributes->length) {
1201                                         foreach ($node->attributes as $attribute) {
1202                                                 $attr[$attribute->name] = $attribute->value;
1203                                         }
1204                                 }
1205
1206                                 if (strtolower($attr['name']) == "twitter:image") {
1207                                         if (!empty($match[3])) {
1208                                                 $text = "[img=" . $attr['content'] . "]" . $match[3] . "[/img]";
1209                                         } else {
1210                                                 $text = "[img]" . $attr['content'] . "[/img]";
1211                                         }
1212                                 }
1213                         }
1214                 }
1215                 Cache::set($cache_key, $text);
1216
1217                 return $text;
1218         }
1219
1220         public static function cleanPictureLinks($text)
1221         {
1222                 $return = preg_replace_callback("&\[url=([^\[\]]*)\]\[img=(.*)\](.*)\[\/img\]\[\/url\]&Usi", 'self::cleanPictureLinksCallback', $text);
1223                 $return = preg_replace_callback("&\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]&Usi", 'self::cleanPictureLinksCallback', $return);
1224                 return $return;
1225         }
1226
1227         /**
1228          * @brief Converts a BBCode message to HTML message
1229          *
1230          * BBcode 2 HTML was written by WAY2WEB.net
1231          * extended to work with Mistpark/Friendica - Mike Macgirvin
1232          *
1233          * Simple HTML values meaning:
1234          * - 0: Friendica display
1235          * - 1: Unused
1236          * - 2: Used for Windows Phone push, Friendica API
1237          * - 3: Used before converting to Markdown in bb2diaspora.php
1238          * - 4: Used for WordPress, Libertree (before Markdown), pump.io and tumblr
1239          * - 5: Unused
1240          * - 6: Unused
1241          * - 7: Used for dfrn, OStatus
1242          * - 8: Used for Twitter, WP backlink text setting
1243          * - 9: ActivityPub
1244          *
1245          * @param string $text
1246          * @param bool   $try_oembed
1247          * @param int    $simple_html
1248          * @param bool   $for_plaintext
1249          * @return string
1250          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1251          */
1252         public static function convert($text, $try_oembed = true, $simple_html = 0, $for_plaintext = false)
1253         {
1254                 $a = DI::app();
1255
1256                 /*
1257                  * preg_match_callback function to replace potential Oembed tags with Oembed content
1258                  *
1259                  * $match[0] = [tag]$url[/tag] or [tag=$url]$title[/tag]
1260                  * $match[1] = $url
1261                  * $match[2] = $title or absent
1262                  */
1263                 $try_oembed_callback = function ($match)
1264                 {
1265                         $url = $match[1];
1266                         $title = $match[2] ?? null;
1267
1268                         try {
1269                                 $return = OEmbed::getHTML($url, $title);
1270                         } catch (Exception $ex) {
1271                                 $return = $match[0];
1272                         }
1273
1274                         return $return;
1275                 };
1276
1277                 // Extracting code blocks before the whitespace processing and the autolinker
1278                 $codeblocks = [];
1279
1280                 $text = preg_replace_callback("#\[code(?:=([^\]]*))?\](.*?)\[\/code\]#ism",
1281                         function ($matches) use (&$codeblocks) {
1282                                 $return = '#codeblock-' . count($codeblocks) . '#';
1283                                 if (strpos($matches[2], "\n") !== false) {
1284                                         $codeblocks[] = '<pre><code class="language-' . trim($matches[1]) . '">' . htmlspecialchars(trim($matches[2], "\n\r"), ENT_NOQUOTES, 'UTF-8') . '</code></pre>';
1285                                 } else {
1286                                         $codeblocks[] = '<code>' . htmlspecialchars($matches[2], ENT_NOQUOTES, 'UTF-8') . '</code>';
1287                                 }
1288
1289                                 return $return;
1290                         },
1291                         $text
1292                 );
1293
1294                 // Hide all [noparse] contained bbtags by spacefying them
1295                 // POSSIBLE BUG --> Will the 'preg' functions crash if there's an embedded image?
1296
1297                 $text = preg_replace_callback("/\[noparse\](.*?)\[\/noparse\]/ism", 'self::escapeNoparseCallback', $text);
1298                 $text = preg_replace_callback("/\[nobb\](.*?)\[\/nobb\]/ism", 'self::escapeNoparseCallback', $text);
1299                 $text = preg_replace_callback("/\[pre\](.*?)\[\/pre\]/ism", 'self::escapeNoparseCallback', $text);
1300
1301                 // Remove the abstract element. It is a non visible element.
1302                 $text = self::stripAbstract($text);
1303
1304                 // Move all spaces out of the tags
1305                 $text = preg_replace("/\[(\w*)\](\s*)/ism", '$2[$1]', $text);
1306                 $text = preg_replace("/(\s*)\[\/(\w*)\]/ism", '[/$2]$1', $text);
1307
1308                 // Extract the private images which use data urls since preg has issues with
1309                 // large data sizes. Stash them away while we do bbcode conversion, and then put them back
1310                 // in after we've done all the regex matching. We cannot use any preg functions to do this.
1311
1312                 $extracted = self::extractImagesFromItemBody($text);
1313                 $text = $extracted['body'];
1314                 $saved_image = $extracted['images'];
1315
1316                 // If we find any event code, turn it into an event.
1317                 // After we're finished processing the bbcode we'll
1318                 // replace all of the event code with a reformatted version.
1319
1320                 $ev = Event::fromBBCode($text);
1321
1322                 // Replace any html brackets with HTML Entities to prevent executing HTML or script
1323                 // Don't use strip_tags here because it breaks [url] search by replacing & with amp
1324
1325                 $text = str_replace("<", "&lt;", $text);
1326                 $text = str_replace(">", "&gt;", $text);
1327
1328                 // remove some newlines before the general conversion
1329                 $text = preg_replace("/\s?\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "[share$1]$2[/share]", $text);
1330                 $text = preg_replace("/\s?\[quote(.*?)\]\s?(.*?)\s?\[\/quote\]\s?/ism", "[quote$1]$2[/quote]", $text);
1331
1332                 // when the content is meant exporting to other systems then remove the avatar picture since this doesn't really look good on these systems
1333                 if (!$try_oembed) {
1334                         $text = preg_replace("/\[share(.*?)avatar\s?=\s?'.*?'\s?(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "\n[share$1$2]$3[/share]", $text);
1335                 }
1336
1337                 // Convert new line chars to html <br /> tags
1338
1339                 // nlbr seems to be hopelessly messed up
1340                 //      $Text = nl2br($Text);
1341
1342                 // We'll emulate it.
1343
1344                 $text = trim($text);
1345                 $text = str_replace("\r\n", "\n", $text);
1346
1347                 // Remove linefeeds inside of the table elements. See issue #6799
1348                 $search = ["\n[th]", "[th]\n", " [th]", "\n[/th]", "[/th]\n", "[/th] ",
1349                         "\n[td]", "[td]\n", " [td]", "\n[/td]", "[/td]\n", "[/td] ",
1350                         "\n[tr]", "[tr]\n", " [tr]", "[tr] ", "\n[/tr]", "[/tr]\n", " [/tr]", "[/tr] ",
1351                         "[table]\n", "[table] ", " [table]", "\n[/table]", " [/table]", "[/table] "];
1352                 $replace = ["[th]", "[th]", "[th]", "[/th]", "[/th]", "[/th]",
1353                         "[td]", "[td]", "[td]", "[/td]", "[/td]", "[/td]",
1354                         "[tr]", "[tr]", "[tr]", "[tr]", "[/tr]", "[/tr]", "[/tr]", "[/tr]",
1355                         "[table]", "[table]", "[table]", "[/table]", "[/table]", "[/table]"];
1356                 do {
1357                         $oldtext = $text;
1358                         $text = str_replace($search, $replace, $text);
1359                 } while ($oldtext != $text);
1360
1361                 // Replace these here only once
1362                 $search = ["\n[table]", "[/table]\n"];
1363                 $replace = ["[table]", "[/table]"];
1364                 $text = str_replace($search, $replace, $text);
1365
1366                 // removing multiplicated newlines
1367                 if (Config::get('system', 'remove_multiplicated_lines')) {
1368                         $search = ["\n\n\n", "\n ", " \n", "[/quote]\n\n", "\n[/quote]", "[/li]\n", "\n[li]", "\n[ul]", "[/ul]\n", "\n\n[share ", "[/attachment]\n",
1369                                         "\n[h1]", "[/h1]\n", "\n[h2]", "[/h2]\n", "\n[h3]", "[/h3]\n", "\n[h4]", "[/h4]\n", "\n[h5]", "[/h5]\n", "\n[h6]", "[/h6]\n"];
1370                         $replace = ["\n\n", "\n", "\n", "[/quote]\n", "[/quote]", "[/li]", "[li]", "[ul]", "[/ul]", "\n[share ", "[/attachment]",
1371                                         "[h1]", "[/h1]", "[h2]", "[/h2]", "[h3]", "[/h3]", "[h4]", "[/h4]", "[h5]", "[/h5]", "[h6]", "[/h6]"];
1372                         do {
1373                                 $oldtext = $text;
1374                                 $text = str_replace($search, $replace, $text);
1375                         } while ($oldtext != $text);
1376                 }
1377
1378                 /// @todo Have a closer look at the different html modes
1379                 // Handle attached links or videos
1380                 if (in_array($simple_html, [9])) {
1381                         $text = self::removeAttachment($text);
1382                 } elseif (!in_array($simple_html, [0, 4])) {
1383                         $text = self::removeAttachment($text, true);
1384                 } else {
1385                         $text = self::convertAttachment($text, $simple_html, $try_oembed);
1386                 }
1387
1388                 // leave open the posibility of [map=something]
1389                 // this is replaced in Item::prepareBody() which has knowledge of the item location
1390                 if (strpos($text, '[/map]') !== false) {
1391                         $text = preg_replace_callback(
1392                                 "/\[map\](.*?)\[\/map\]/ism",
1393                                 function ($match) use ($simple_html) {
1394                                         return str_replace($match[0], '<p class="map">' . Map::byLocation($match[1], $simple_html) . '</p>', $match[0]);
1395                                 },
1396                                 $text
1397                         );
1398                 }
1399
1400                 if (strpos($text, '[map=') !== false) {
1401                         $text = preg_replace_callback(
1402                                 "/\[map=(.*?)\]/ism",
1403                                 function ($match) use ($simple_html) {
1404                                         return str_replace($match[0], '<p class="map">' . Map::byCoordinates(str_replace('/', ' ', $match[1]), $simple_html) . '</p>', $match[0]);
1405                                 },
1406                                 $text
1407                         );
1408                 }
1409
1410                 if (strpos($text, '[map]') !== false) {
1411                         $text = preg_replace("/\[map\]/", '<p class="map"></p>', $text);
1412                 }
1413
1414                 // Check for headers
1415                 $text = preg_replace("(\[h1\](.*?)\[\/h1\])ism", '<h1>$1</h1>', $text);
1416                 $text = preg_replace("(\[h2\](.*?)\[\/h2\])ism", '<h2>$1</h2>', $text);
1417                 $text = preg_replace("(\[h3\](.*?)\[\/h3\])ism", '<h3>$1</h3>', $text);
1418                 $text = preg_replace("(\[h4\](.*?)\[\/h4\])ism", '<h4>$1</h4>', $text);
1419                 $text = preg_replace("(\[h5\](.*?)\[\/h5\])ism", '<h5>$1</h5>', $text);
1420                 $text = preg_replace("(\[h6\](.*?)\[\/h6\])ism", '<h6>$1</h6>', $text);
1421
1422                 // Check for paragraph
1423                 $text = preg_replace("(\[p\](.*?)\[\/p\])ism", '<p>$1</p>', $text);
1424
1425                 // Check for bold text
1426                 $text = preg_replace("(\[b\](.*?)\[\/b\])ism", '<strong>$1</strong>', $text);
1427
1428                 // Check for Italics text
1429                 $text = preg_replace("(\[i\](.*?)\[\/i\])ism", '<em>$1</em>', $text);
1430
1431                 // Check for Underline text
1432                 $text = preg_replace("(\[u\](.*?)\[\/u\])ism", '<u>$1</u>', $text);
1433
1434                 // Check for strike-through text
1435                 $text = preg_replace("(\[s\](.*?)\[\/s\])ism", '<s>$1</s>', $text);
1436
1437                 // Check for over-line text
1438                 $text = preg_replace("(\[o\](.*?)\[\/o\])ism", '<span class="overline">$1</span>', $text);
1439
1440                 // Check for colored text
1441                 $text = preg_replace("(\[color=(.*?)\](.*?)\[\/color\])ism", "<span style=\"color: $1;\">$2</span>", $text);
1442
1443                 // Check for sized text
1444                 // [size=50] --> font-size: 50px (with the unit).
1445                 if ($simple_html != 3) {
1446                         $text = preg_replace("(\[size=(\d*?)\](.*?)\[\/size\])ism", "<span style=\"font-size: $1px; line-height: initial;\">$2</span>", $text);
1447                         $text = preg_replace("(\[size=(.*?)\](.*?)\[\/size\])ism", "<span style=\"font-size: $1; line-height: initial;\">$2</span>", $text);
1448                 } else {
1449                         // Issue 2199: Diaspora doesn't interpret the construct above, nor the <small> or <big> element
1450                         $text = preg_replace("(\[size=(.*?)\](.*?)\[\/size\])ism", "$2", $text);
1451                 }
1452
1453
1454                 // Check for centered text
1455                 $text = preg_replace("(\[center\](.*?)\[\/center\])ism", "<div style=\"text-align:center;\">$1</div>", $text);
1456
1457                 // Check for list text
1458                 $text = str_replace("[*]", "<li>", $text);
1459
1460                 // Check for style sheet commands
1461                 $text = preg_replace_callback(
1462                         "(\[style=(.*?)\](.*?)\[\/style\])ism",
1463                         function ($match) {
1464                                 return "<span style=\"" . HTML::sanitizeCSS($match[1]) . ";\">" . $match[2] . "</span>";
1465                         },
1466                         $text
1467                 );
1468
1469                 // Check for CSS classes
1470                 $text = preg_replace_callback(
1471                         "(\[class=(.*?)\](.*?)\[\/class\])ism",
1472                         function ($match) {
1473                                 return "<span class=\"" . HTML::sanitizeCSS($match[1]) . "\">" . $match[2] . "</span>";
1474                         },
1475                         $text
1476                 );
1477
1478                 // handle nested lists
1479                 $endlessloop = 0;
1480
1481                 while ((((strpos($text, "[/list]") !== false) && (strpos($text, "[list") !== false)) ||
1482                                 ((strpos($text, "[/ol]") !== false) && (strpos($text, "[ol]") !== false)) ||
1483                                 ((strpos($text, "[/ul]") !== false) && (strpos($text, "[ul]") !== false)) ||
1484                                 ((strpos($text, "[/li]") !== false) && (strpos($text, "[li]") !== false))) && (++$endlessloop < 20)) {
1485                         $text = preg_replace("/\[list\](.*?)\[\/list\]/ism", '<ul class="listbullet" style="list-style-type: circle;">$1</ul>', $text);
1486                         $text = preg_replace("/\[list=\](.*?)\[\/list\]/ism", '<ul class="listnone" style="list-style-type: none;">$1</ul>', $text);
1487                         $text = preg_replace("/\[list=1\](.*?)\[\/list\]/ism", '<ul class="listdecimal" style="list-style-type: decimal;">$1</ul>', $text);
1488                         $text = preg_replace("/\[list=((?-i)i)\](.*?)\[\/list\]/ism", '<ul class="listlowerroman" style="list-style-type: lower-roman;">$2</ul>', $text);
1489                         $text = preg_replace("/\[list=((?-i)I)\](.*?)\[\/list\]/ism", '<ul class="listupperroman" style="list-style-type: upper-roman;">$2</ul>', $text);
1490                         $text = preg_replace("/\[list=((?-i)a)\](.*?)\[\/list\]/ism", '<ul class="listloweralpha" style="list-style-type: lower-alpha;">$2</ul>', $text);
1491                         $text = preg_replace("/\[list=((?-i)A)\](.*?)\[\/list\]/ism", '<ul class="listupperalpha" style="list-style-type: upper-alpha;">$2</ul>', $text);
1492                         $text = preg_replace("/\[ul\](.*?)\[\/ul\]/ism", '<ul class="listbullet" style="list-style-type: circle;">$1</ul>', $text);
1493                         $text = preg_replace("/\[ol\](.*?)\[\/ol\]/ism", '<ul class="listdecimal" style="list-style-type: decimal;">$1</ul>', $text);
1494                         $text = preg_replace("/\[li\](.*?)\[\/li\]/ism", '<li>$1</li>', $text);
1495                 }
1496
1497                 $text = preg_replace("/\[th\](.*?)\[\/th\]/sm", '<th>$1</th>', $text);
1498                 $text = preg_replace("/\[td\](.*?)\[\/td\]/sm", '<td>$1</td>', $text);
1499                 $text = preg_replace("/\[tr\](.*?)\[\/tr\]/sm", '<tr>$1</tr>', $text);
1500                 $text = preg_replace("/\[table\](.*?)\[\/table\]/sm", '<table>$1</table>', $text);
1501
1502                 $text = preg_replace("/\[table border=1\](.*?)\[\/table\]/sm", '<table border="1" >$1</table>', $text);
1503                 $text = preg_replace("/\[table border=0\](.*?)\[\/table\]/sm", '<table border="0" >$1</table>', $text);
1504
1505                 $text = str_replace('[hr]', '<hr />', $text);
1506
1507                 if (!$for_plaintext) {
1508                         $escaped = [];
1509
1510                         // Escaping BBCodes susceptible to contain rogue URL we don'' want the autolinker to catch
1511                         $text = preg_replace_callback('#\[(url|img|audio|video|youtube|vimeo|share|attachment|iframe|bookmark).+?\[/\1\]#ism',
1512                                 function ($matches) use (&$escaped) {
1513                                         $return = '{escaped-' . count($escaped) . '}';
1514                                         $escaped[] = $matches[0];
1515
1516                                         return $return;
1517                                 },
1518                                 $text
1519                         );
1520
1521                         // Autolinker for isolated URLs
1522                         $text = preg_replace(Strings::autoLinkRegEx(), '[url]$1[/url]', $text);
1523
1524                         // Restoring escaped blocks
1525                         $text = preg_replace_callback('/{escaped-([0-9]+)}/iU',
1526                                 function ($matches) use ($escaped) {
1527                                         return $escaped[intval($matches[1])] ?? $matches[0];
1528                                 },
1529                                 $text
1530                         );
1531                 }
1532
1533                 // This is actually executed in Item::prepareBody()
1534
1535                 $nosmile = strpos($text, '[nosmile]') !== false;
1536                 $text = str_replace('[nosmile]', '', $text);
1537
1538                 // Check for font change text
1539                 $text = preg_replace("/\[font=(.*?)\](.*?)\[\/font\]/sm", "<span style=\"font-family: $1;\">$2</span>", $text);
1540
1541                 // Declare the format for [spoiler] layout
1542                 $SpoilerLayout = '<details class="spoiler"><summary>' . L10n::t('Click to open/close') . '</summary>$1</details>';
1543
1544                 // Check for [spoiler] text
1545                 // handle nested quotes
1546                 $endlessloop = 0;
1547                 while ((strpos($text, "[/spoiler]") !== false) && (strpos($text, "[spoiler]") !== false) && (++$endlessloop < 20)) {
1548                         $text = preg_replace("/\[spoiler\](.*?)\[\/spoiler\]/ism", $SpoilerLayout, $text);
1549                 }
1550
1551                 // Check for [spoiler=Title] text
1552
1553                 // handle nested quotes
1554                 $endlessloop = 0;
1555                 while ((strpos($text, "[/spoiler]")!== false)  && (strpos($text, "[spoiler=") !== false) && (++$endlessloop < 20)) {
1556                         $text = preg_replace("/\[spoiler=[\"\']*(.*?)[\"\']*\](.*?)\[\/spoiler\]/ism",
1557                                 '<details class="spoiler"><summary>$1</summary>$2</details>',
1558                                 $text);
1559                 }
1560
1561                 // Declare the format for [quote] layout
1562                 $QuoteLayout = '<blockquote>$1</blockquote>';
1563
1564                 // Check for [quote] text
1565                 // handle nested quotes
1566                 $endlessloop = 0;
1567                 while ((strpos($text, "[/quote]") !== false) && (strpos($text, "[quote]") !== false) && (++$endlessloop < 20)) {
1568                         $text = preg_replace("/\[quote\](.*?)\[\/quote\]/ism", "$QuoteLayout", $text);
1569                 }
1570
1571                 // Check for [quote=Author] text
1572
1573                 $t_wrote = L10n::t('$1 wrote:');
1574
1575                 // handle nested quotes
1576                 $endlessloop = 0;
1577                 while ((strpos($text, "[/quote]")!== false)  && (strpos($text, "[quote=") !== false) && (++$endlessloop < 20)) {
1578                         $text = preg_replace("/\[quote=[\"\']*(.*?)[\"\']*\](.*?)\[\/quote\]/ism",
1579                                 "<p><strong class=".'"author"'.">" . $t_wrote . "</strong></p><blockquote>$2</blockquote>",
1580                                 $text);
1581                 }
1582
1583
1584                 // [img=widthxheight]image source[/img]
1585                 $text = preg_replace_callback(
1586                         "/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism",
1587                         function ($matches) use ($simple_html) {
1588                                 if (strpos($matches[3], "data:image/") === 0) {
1589                                         return $matches[0];
1590                                 }
1591
1592                                 $matches[3] = self::proxyUrl($matches[3], $simple_html);
1593                                 return "[img=" . $matches[1] . "x" . $matches[2] . "]" . $matches[3] . "[/img]";
1594                         },
1595                         $text
1596                 );
1597
1598                 $text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '<img src="$3" style="width: $1px;" >', $text);
1599                 $text = preg_replace("/\[zmg\=([0-9]*)x([0-9]*)\](.*?)\[\/zmg\]/ism", '<img class="zrl" src="$3" style="width: $1px;" >', $text);
1600
1601                 $text = preg_replace_callback("/\[img\=(.*?)\](.*?)\[\/img\]/ism",
1602                         function ($matches) use ($simple_html) {
1603                                 $matches[1] = self::proxyUrl($matches[1], $simple_html);
1604                                 $matches[2] = htmlspecialchars($matches[2], ENT_COMPAT);
1605                                 return '<img src="' . $matches[1] . '" alt="' . $matches[2] . '" title="' . $matches[2] . '">';
1606                         },
1607                         $text);
1608
1609                 // Images
1610                 // [img]pathtoimage[/img]
1611                 $text = preg_replace_callback(
1612                         "/\[img\](.*?)\[\/img\]/ism",
1613                         function ($matches) use ($simple_html) {
1614                                 if (strpos($matches[1], "data:image/") === 0) {
1615                                         return $matches[0];
1616                                 }
1617
1618                                 $matches[1] = self::proxyUrl($matches[1], $simple_html);
1619                                 return "[img]" . $matches[1] . "[/img]";
1620                         },
1621                         $text
1622                 );
1623
1624                 $text = preg_replace("/\[img\](.*?)\[\/img\]/ism", '<img src="$1" alt="' . L10n::t('Image/photo') . '" />', $text);
1625                 $text = preg_replace("/\[zmg\](.*?)\[\/zmg\]/ism", '<img src="$1" alt="' . L10n::t('Image/photo') . '" />', $text);
1626
1627                 $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);
1628                 $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 />', $text);
1629                 //$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);
1630
1631                 // Simplify "video" element
1632                 $text = preg_replace('(\[video.*?\ssrc\s?=\s?([^\s\]]+).*?\].*?\[/video\])ism', '[video]$1[/video]', $text);
1633
1634                 // Try to Oembed
1635                 if ($try_oembed) {
1636                         $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);
1637                         $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);
1638
1639                         $text = preg_replace_callback("/\[video\](.*?)\[\/video\]/ism", $try_oembed_callback, $text);
1640                         $text = preg_replace_callback("/\[audio\](.*?)\[\/audio\]/ism", $try_oembed_callback, $text);
1641                 } else {
1642                         $text = preg_replace("/\[video\](.*?)\[\/video\]/ism",
1643                                 '<a href="$1" target="_blank">$1</a>', $text);
1644                         $text = preg_replace("/\[audio\](.*?)\[\/audio\]/ism",
1645                                 '<a href="$1" target="_blank">$1</a>', $text);
1646                 }
1647
1648                 // html5 video and audio
1649
1650
1651                 if ($try_oembed) {
1652                         $text = preg_replace("/\[iframe\](.*?)\[\/iframe\]/ism", '<iframe src="$1" width="' . $a->videowidth . '" height="' . $a->videoheight . '"><a href="$1">$1</a></iframe>', $text);
1653                 } else {
1654                         $text = preg_replace("/\[iframe\](.*?)\[\/iframe\]/ism", '<a href="$1">$1</a>', $text);
1655                 }
1656
1657                 // Youtube extensions
1658                 if ($try_oembed) {
1659                         $text = preg_replace_callback("/\[youtube\](https?:\/\/www.youtube.com\/watch\?v\=.*?)\[\/youtube\]/ism", $try_oembed_callback, $text);
1660                         $text = preg_replace_callback("/\[youtube\](www.youtube.com\/watch\?v\=.*?)\[\/youtube\]/ism", $try_oembed_callback, $text);
1661                         $text = preg_replace_callback("/\[youtube\](https?:\/\/youtu.be\/.*?)\[\/youtube\]/ism", $try_oembed_callback, $text);
1662                 }
1663
1664                 $text = preg_replace("/\[youtube\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/youtube\]/ism", '[youtube]$1[/youtube]', $text);
1665                 $text = preg_replace("/\[youtube\]https?:\/\/www.youtube.com\/embed\/(.*?)\[\/youtube\]/ism", '[youtube]$1[/youtube]', $text);
1666                 $text = preg_replace("/\[youtube\]https?:\/\/youtu.be\/(.*?)\[\/youtube\]/ism", '[youtube]$1[/youtube]', $text);
1667
1668                 if ($try_oembed) {
1669                         $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);
1670                 } else {
1671                         $text = preg_replace("/\[youtube\]([A-Za-z0-9\-_=]+)(.*?)\[\/youtube\]/ism",
1672                                 '<a href="https://www.youtube.com/watch?v=$1" target="_blank">https://www.youtube.com/watch?v=$1</a>', $text);
1673                 }
1674
1675                 if ($try_oembed) {
1676                         $text = preg_replace_callback("/\[vimeo\](https?:\/\/player.vimeo.com\/video\/[0-9]+).*?\[\/vimeo\]/ism", $try_oembed_callback, $text);
1677                         $text = preg_replace_callback("/\[vimeo\](https?:\/\/vimeo.com\/[0-9]+).*?\[\/vimeo\]/ism", $try_oembed_callback, $text);
1678                 }
1679
1680                 $text = preg_replace("/\[vimeo\]https?:\/\/player.vimeo.com\/video\/([0-9]+)(.*?)\[\/vimeo\]/ism", '[vimeo]$1[/vimeo]', $text);
1681                 $text = preg_replace("/\[vimeo\]https?:\/\/vimeo.com\/([0-9]+)(.*?)\[\/vimeo\]/ism", '[vimeo]$1[/vimeo]', $text);
1682
1683                 if ($try_oembed) {
1684                         $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);
1685                 } else {
1686                         $text = preg_replace("/\[vimeo\]([0-9]+)(.*?)\[\/vimeo\]/ism",
1687                                 '<a href="https://vimeo.com/$1" target="_blank">https://vimeo.com/$1</a>', $text);
1688                 }
1689
1690                 // oembed tag
1691                 $text = OEmbed::BBCode2HTML($text);
1692
1693                 // Avoid triple linefeeds through oembed
1694                 $text = str_replace("<br style='clear:left'></span><br /><br />", "<br style='clear:left'></span><br />", $text);
1695
1696                 // If we found an event earlier, strip out all the event code and replace with a reformatted version.
1697                 // Replace the event-start section with the entire formatted event. The other bbcode is stripped.
1698                 // Summary (e.g. title) is required, earlier revisions only required description (in addition to
1699                 // start which is always required). Allow desc with a missing summary for compatibility.
1700
1701                 if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
1702                         $sub = Event::getHTML($ev, $simple_html);
1703
1704                         $text = preg_replace("/\[event\-summary\](.*?)\[\/event\-summary\]/ism", '', $text);
1705                         $text = preg_replace("/\[event\-description\](.*?)\[\/event\-description\]/ism", '', $text);
1706                         $text = preg_replace("/\[event\-start\](.*?)\[\/event\-start\]/ism", $sub, $text);
1707                         $text = preg_replace("/\[event\-finish\](.*?)\[\/event\-finish\]/ism", '', $text);
1708                         $text = preg_replace("/\[event\-location\](.*?)\[\/event\-location\]/ism", '', $text);
1709                         $text = preg_replace("/\[event\-adjust\](.*?)\[\/event\-adjust\]/ism", '', $text);
1710                         $text = preg_replace("/\[event\-id\](.*?)\[\/event\-id\]/ism", '', $text);
1711                 }
1712
1713                 // Replace non graphical smilies for external posts
1714                 if (!$nosmile && !$for_plaintext) {
1715                         $text = Smilies::replace($text);
1716                 }
1717
1718                 if (!$for_plaintext) {
1719                         if (in_array($simple_html, [7, 9])) {
1720                                 $text = preg_replace_callback("/\[url\](.*?)\[\/url\]/ism", 'self::convertUrlForActivityPubCallback', $text);
1721                                 $text = preg_replace_callback("/\[url\=(.*?)\](.*?)\[\/url\]/ism", 'self::convertUrlForActivityPubCallback', $text);
1722                         }
1723                 } else {
1724                         $text = preg_replace("(\[url\](.*?)\[\/url\])ism", " $1 ", $text);
1725                         $text = preg_replace_callback("&\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]&Usi", 'self::removePictureLinksCallback', $text);
1726                 }
1727
1728                 $text = str_replace(["\r","\n"], ['<br />', '<br />'], $text);
1729
1730                 // Remove all hashtag addresses
1731                 if ($simple_html && !in_array($simple_html, [3, 7, 9])) {
1732                         $text = preg_replace("/([#@!])\[url\=(.*?)\](.*?)\[\/url\]/ism", '$1$3', $text);
1733                 } elseif ($simple_html == 3) {
1734                         // The ! is converted to @ since Diaspora only understands the @
1735                         $text = preg_replace("/([@!])\[url\=(.*?)\](.*?)\[\/url\]/ism",
1736                                 '@<a href="$2">$3</a>',
1737                                 $text);
1738                 } elseif (in_array($simple_html, [7, 9])) {
1739                         $text = preg_replace("/([@!])\[url\=(.*?)\](.*?)\[\/url\]/ism",
1740                                 '$1<span class="vcard"><a href="$2" class="url u-url mention" title="$3"><span class="fn nickname mention">$3</span></a></span>',
1741                                 $text);
1742                 } elseif (!$simple_html) {
1743                         $text = preg_replace("/([@!])\[url\=(.*?)\](.*?)\[\/url\]/ism",
1744                                 '$1<a href="$2" class="userinfo mention" title="$3">$3</a>',
1745                                 $text);
1746                 }
1747
1748                 // Bookmarks in red - will be converted to bookmarks in friendica
1749                 $text = preg_replace("/#\^\[url\](.*?)\[\/url\]/ism", '[bookmark=$1]$1[/bookmark]', $text);
1750                 $text = preg_replace("/#\^\[url\=(.*?)\](.*?)\[\/url\]/ism", '[bookmark=$1]$2[/bookmark]', $text);
1751                 $text = preg_replace("/#\[url\=.*?\]\^\[\/url\]\[url\=(.*?)\](.*?)\[\/url\]/i",
1752                                         "[bookmark=$1]$2[/bookmark]", $text);
1753
1754                 if (in_array($simple_html, [2, 6, 7, 8])) {
1755                         $text = preg_replace_callback("/([^#@!])\[url\=([^\]]*)\](.*?)\[\/url\]/ism", "self::expandLinksCallback", $text);
1756                         //$Text = preg_replace("/[^#@!]\[url\=([^\]]*)\](.*?)\[\/url\]/ism", ' $2 [url]$1[/url]', $Text);
1757                         $text = preg_replace("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", ' $2 [url]$1[/url]',$text);
1758                 }
1759
1760                 if ($simple_html == 5) {
1761                         $text = preg_replace("/[^#@!]\[url\=(.*?)\](.*?)\[\/url\]/ism", '[url]$1[/url]', $text);
1762                 }
1763
1764                 // Perform URL Search
1765                 if ($try_oembed) {
1766                         $text = preg_replace_callback("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", $try_oembed_callback, $text);
1767                 }
1768
1769                 if ($simple_html == 5) {
1770                         $text = preg_replace("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", '[url]$1[/url]', $text);
1771                 } else {
1772                         $text = preg_replace("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", '[url=$1]$2[/url]', $text);
1773                 }
1774
1775                 // Handle Diaspora posts
1776                 $text = preg_replace_callback(
1777                         "&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1778                         function ($match) {
1779                                 return "[url=" . DI::baseUrl() . "/display/" . $match[1] . "]" . $match[2] . "[/url]";
1780                         }, $text
1781                 );
1782
1783                 $text = preg_replace_callback(
1784                         "&\[url=/people\?q\=(.*)\](.*)\[\/url\]&Usi",
1785                         function ($match) {
1786                                 return "[url=" . DI::baseUrl() . "/search?search=%40" . $match[1] . "]" . $match[2] . "[/url]";
1787                         }, $text
1788                 );
1789
1790                 // Server independent link to posts and comments
1791                 // See issue: https://github.com/diaspora/diaspora_federation/issues/75
1792                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1793                 $text = preg_replace($expression, DI::baseUrl()."/display/$1", $text);
1794
1795                 /* Tag conversion
1796                  * Supports:
1797                  * - #[url=<anything>]<term>[/url]
1798                  * - [url=<anything>]#<term>[/url]
1799                  */
1800                 $text = preg_replace_callback("/(?:#\[url\=[^\[\]]*\]|\[url\=[^\[\]]*\]#)(.*?)\[\/url\]/ism", function($matches) {
1801                         return '#<a href="'
1802                                 . DI::baseUrl() . '/search?tag=' . rawurlencode($matches[1])
1803                                 . '" class="tag" rel="tag" title="' . XML::escape($matches[1]) . '">'
1804                                 . XML::escape($matches[1])
1805                                 . '</a>';
1806                 }, $text);
1807
1808                 // We need no target="_blank" for local links
1809                 // convert links start with DI::baseUrl() as local link without the target="_blank" attribute
1810                 $escapedBaseUrl = preg_quote(DI::baseUrl(), '/');
1811                 $text = preg_replace("/\[url\](".$escapedBaseUrl.".*?)\[\/url\]/ism", '<a href="$1">$1</a>', $text);
1812                 $text = preg_replace("/\[url\=(".$escapedBaseUrl.".*?)\](.*?)\[\/url\]/ism", '<a href="$1">$2</a>', $text);
1813
1814                 $text = preg_replace("/\[url\](.*?)\[\/url\]/ism", '<a href="$1" target="_blank">$1</a>', $text);
1815                 $text = preg_replace("/\[url\=(.*?)\](.*?)\[\/url\]/ism", '<a href="$1" target="_blank">$2</a>', $text);
1816
1817                 // Red compatibility, though the link can't be authenticated on Friendica
1818                 $text = preg_replace("/\[zrl\=(.*?)\](.*?)\[\/zrl\]/ism", '<a href="$1" target="_blank">$2</a>', $text);
1819
1820
1821                 // we may need to restrict this further if it picks up too many strays
1822                 // link acct:user@host to a webfinger profile redirector
1823
1824                 $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);
1825
1826                 // Perform MAIL Search
1827                 $text = preg_replace("/\[mail\](.*?)\[\/mail\]/", '<a href="mailto:$1">$1</a>', $text);
1828                 $text = preg_replace("/\[mail\=(.*?)\](.*?)\[\/mail\]/", '<a href="mailto:$1">$2</a>', $text);
1829
1830                 // Unhide all [noparse] contained bbtags unspacefying them
1831                 // and triming the [noparse] tag.
1832
1833                 $text = preg_replace_callback("/\[noparse\](.*?)\[\/noparse\]/ism", 'self::unescapeNoparseCallback', $text);
1834                 $text = preg_replace_callback("/\[nobb\](.*?)\[\/nobb\]/ism", 'self::unescapeNoparseCallback', $text);
1835                 $text = preg_replace_callback("/\[pre\](.*?)\[\/pre\]/ism", 'self::unescapeNoparseCallback', $text);
1836
1837                 /// @todo What is the meaning of these lines?
1838                 $text = preg_replace('/\[\&amp\;([#a-z0-9]+)\;\]/', '&$1;', $text);
1839                 $text = preg_replace('/\&\#039\;/', '\'', $text);
1840
1841                 // Currently deactivated, it made problems with " inside of alt texts.
1842                 //$text = preg_replace('/\&quot\;/', '"', $text);
1843
1844                 // fix any escaped ampersands that may have been converted into links
1845                 $text = preg_replace('/\<([^>]*?)(src|href)=(.*?)\&amp\;(.*?)\>/ism', '<$1$2=$3&$4>', $text);
1846
1847                 // sanitizes src attributes (http and redir URLs for displaying in a web page, cid used for inline images in emails)
1848                 $allowed_src_protocols = ['//', 'http://', 'https://', 'redir/', 'cid:'];
1849
1850                 array_walk($allowed_src_protocols, function(&$value) { $value = preg_quote($value, '#');});
1851
1852                 $text = preg_replace('#<([^>]*?)(src)="(?!' . implode('|', $allowed_src_protocols) . ')(.*?)"(.*?)>#ism',
1853                                          '<$1$2=""$4 data-original-src="$3" class="invalid-src" title="' . L10n::t('Invalid source protocol') . '">', $text);
1854
1855                 // sanitize href attributes (only whitelisted protocols URLs)
1856                 // default value for backward compatibility
1857                 $allowed_link_protocols = Config::get('system', 'allowed_link_protocols', []);
1858
1859                 // Always allowed protocol even if config isn't set or not including it
1860                 $allowed_link_protocols[] = '//';
1861                 $allowed_link_protocols[] = 'http://';
1862                 $allowed_link_protocols[] = 'https://';
1863                 $allowed_link_protocols[] = 'redir/';
1864
1865                 array_walk($allowed_link_protocols, function(&$value) { $value = preg_quote($value, '#');});
1866
1867                 $regex = '#<([^>]*?)(href)="(?!' . implode('|', $allowed_link_protocols) . ')(.*?)"(.*?)>#ism';
1868                 $text = preg_replace($regex, '<$1$2="javascript:void(0)"$4 data-original-href="$3" class="invalid-href" title="' . L10n::t('Invalid link protocol') . '">', $text);
1869
1870                 // Shared content
1871                 $text = self::convertShare(
1872                         $text,
1873                         function (array $attributes, array $author_contact, $content, $is_quote_share) use ($simple_html) {
1874                                 return self::convertShareCallback($attributes, $author_contact, $content, $is_quote_share, $simple_html);
1875                         }
1876                 );
1877
1878                 if ($saved_image) {
1879                         $text = self::interpolateSavedImagesIntoItemBody($text, $saved_image);
1880                 }
1881
1882                 // Restore code blocks
1883                 $text = preg_replace_callback('/#codeblock-([0-9]+)#/iU',
1884                         function ($matches) use ($codeblocks) {
1885                                 $return = $matches[0];
1886                                 if (isset($codeblocks[intval($matches[1])])) {
1887                                         $return = $codeblocks[$matches[1]];
1888                                 }
1889                                 return $return;
1890                         },
1891                         $text
1892                 );
1893
1894                 // Clean up the HTML by loading and saving the HTML with the DOM.
1895                 // Bad structured html can break a whole page.
1896                 // For performance reasons do it only with activated item cache or at export.
1897                 if (!$try_oembed || (get_itemcachepath() != '')) {
1898                         $doc = new DOMDocument();
1899                         $doc->preserveWhiteSpace = false;
1900
1901                         $text = mb_convert_encoding($text, 'HTML-ENTITIES', "UTF-8");
1902
1903                         $doctype = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">';
1904                         $encoding = '<?xml encoding="UTF-8">';
1905                         @$doc->loadHTML($encoding . $doctype . '<html><body>' . $text . '</body></html>');
1906                         $doc->encoding = 'UTF-8';
1907                         $text = $doc->saveHTML();
1908                         $text = str_replace(['<html><body>', '</body></html>', $doctype, $encoding], ['', '', '', ''], $text);
1909
1910                         $text = str_replace('<br></li>', '</li>', $text);
1911
1912                         //$Text = mb_convert_encoding($Text, "UTF-8", 'HTML-ENTITIES');
1913                 }
1914
1915                 // Clean up some useless linebreaks in lists
1916                 //$Text = str_replace('<br /><ul', '<ul ', $Text);
1917                 //$Text = str_replace('</ul><br />', '</ul>', $Text);
1918                 //$Text = str_replace('</li><br />', '</li>', $Text);
1919                 //$Text = str_replace('<br /><li>', '<li>', $Text);
1920                 //$Text = str_replace('<br /><ul', '<ul ', $Text);
1921
1922                 Hook::callAll('bbcode', $text);
1923
1924                 return trim($text);
1925         }
1926
1927         /**
1928          * @brief Strips the "abstract" tag from the provided text
1929          *
1930          * @param string $text The text with BBCode
1931          * @return string The same text - but without "abstract" element
1932          */
1933         public static function stripAbstract($text)
1934         {
1935                 $text = preg_replace("/[\s|\n]*\[abstract\].*?\[\/abstract\][\s|\n]*/ism", '', $text);
1936                 $text = preg_replace("/[\s|\n]*\[abstract=.*?\].*?\[\/abstract][\s|\n]*/ism", '', $text);
1937
1938                 return $text;
1939         }
1940
1941         /**
1942          * @brief Returns the value of the "abstract" element
1943          *
1944          * @param string $text The text that maybe contains the element
1945          * @param string $addon The addon for which the abstract is meant for
1946          * @return string The abstract
1947          */
1948         public static function getAbstract($text, $addon = '')
1949         {
1950                 $abstract = '';
1951                 $abstracts = [];
1952                 $addon = strtolower($addon);
1953
1954                 if (preg_match_all("/\[abstract=(.*?)\](.*?)\[\/abstract\]/ism", $text, $results, PREG_SET_ORDER)) {
1955                         foreach ($results AS $result) {
1956                                 $abstracts[strtolower($result[1])] = $result[2];
1957                         }
1958                 }
1959
1960                 if (isset($abstracts[$addon])) {
1961                         $abstract = $abstracts[$addon];
1962                 }
1963
1964                 if ($abstract == '' && preg_match("/\[abstract\](.*?)\[\/abstract\]/ism", $text, $result)) {
1965                         $abstract = $result[1];
1966                 }
1967
1968                 return $abstract;
1969         }
1970
1971         /**
1972          * @brief Callback function to replace a Friendica style mention in a mention for Diaspora
1973          *
1974          * @param array $match Matching values for the callback
1975          *                     [1] = Mention type (! or @)
1976          *                     [2] = Name
1977          *                     [3] = Address
1978          * @return string Replaced mention
1979          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1980          * @throws \ImagickException
1981          */
1982         private static function bbCodeMention2DiasporaCallback($match)
1983         {
1984                 $contact = Contact::getDetailsByURL($match[3]);
1985
1986                 if (empty($contact['addr'])) {
1987                         $contact = Probe::uri($match[3]);
1988                 }
1989
1990                 if (empty($contact['addr'])) {
1991                         return $match[0];
1992                 }
1993
1994                 $mention = $match[1] . '{' . $match[2] . '; ' . $contact['addr'] . '}';
1995                 return $mention;
1996         }
1997
1998         /**
1999          * @brief Converts a BBCode text into Markdown
2000          *
2001          * This function converts a BBCode item body to be sent to Markdown-enabled
2002          * systems like Diaspora and Libertree
2003          *
2004          * @param string $text
2005          * @param bool   $for_diaspora Diaspora requires more changes than Libertree
2006          * @return string
2007          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2008          */
2009         public static function toMarkdown($text, $for_diaspora = true)
2010         {
2011                 $a = DI::app();
2012
2013                 $original_text = $text;
2014
2015                 // Since Diaspora is creating a summary for links, this function removes them before posting
2016                 if ($for_diaspora) {
2017                         $text = self::removeShareInformation($text);
2018                 }
2019
2020                 /**
2021                  * Transform #tags, strip off the [url] and replace spaces with underscore
2022                  */
2023                 $url_search_string = "^\[\]";
2024                 $text = preg_replace_callback("/#\[url\=([$url_search_string]*)\](.*?)\[\/url\]/i",
2025                         function ($matches) {
2026                                 return '#' . str_replace(' ', '_', $matches[2]);
2027                         },
2028                         $text
2029                 );
2030
2031                 // Converting images with size parameters to simple images. Markdown doesn't know it.
2032                 $text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $text);
2033
2034                 // Convert it to HTML - don't try oembed
2035                 if ($for_diaspora) {
2036                         $text = self::convert($text, false, 3);
2037
2038                         // Add all tags that maybe were removed
2039                         if (preg_match_all("/#\[url\=([$url_search_string]*)\](.*?)\[\/url\]/ism", $original_text, $tags)) {
2040                                 $tagline = '';
2041                                 foreach ($tags[2] as $tag) {
2042                                         $tag = html_entity_decode($tag, ENT_QUOTES, 'UTF-8');
2043                                         if (!strpos(html_entity_decode($text, ENT_QUOTES, 'UTF-8'), '#' . $tag)) {
2044                                                 $tagline .= '#' . $tag . ' ';
2045                                         }
2046                                 }
2047                                 $text = $text . " " . $tagline;
2048                         }
2049                 } else {
2050                         $text = self::convert($text, false, 4);
2051                 }
2052
2053                 // If a link is followed by a quote then there should be a newline before it
2054                 // Maybe we should make this newline at every time before a quote.
2055                 $text = str_replace(['</a><blockquote>'], ['</a><br><blockquote>'], $text);
2056
2057                 $stamp1 = microtime(true);
2058
2059                 // Now convert HTML to Markdown
2060                 $text = HTML::toMarkdown($text);
2061
2062                 DI::profiler()->saveTimestamp($stamp1, "parser", System::callstack());
2063
2064                 // Libertree has a problem with escaped hashtags.
2065                 $text = str_replace(['\#'], ['#'], $text);
2066
2067                 // Remove any leading or trailing whitespace, as this will mess up
2068                 // the Diaspora signature verification and cause the item to disappear
2069                 $text = trim($text);
2070
2071                 if ($for_diaspora) {
2072                         $url_search_string = "^\[\]";
2073                         $text = preg_replace_callback(
2074                                 "/([@!])\[(.*?)\]\(([$url_search_string]*?)\)/ism",
2075                                 ['self', 'bbCodeMention2DiasporaCallback'],
2076                                 $text
2077                         );
2078                 }
2079
2080                 Hook::callAll('bb2diaspora', $text);
2081
2082                 return $text;
2083         }
2084
2085         /**
2086      * @brief Pull out all #hashtags and @person tags from $string.
2087      *
2088      * We also get @person@domain.com - which would make
2089      * the regex quite complicated as tags can also
2090      * end a sentence. So we'll run through our results
2091      * and strip the period from any tags which end with one.
2092      * Returns array of tags found, or empty array.
2093      *
2094      * @param string $string Post content
2095      *
2096      * @return array List of tag and person names
2097      */
2098     public static function getTags($string)
2099     {
2100         $ret = [];
2101
2102         // Convert hashtag links to hashtags
2103         $string = preg_replace('/#\[url\=([^\[\]]*)\](.*?)\[\/url\]/ism', '#$2', $string);
2104
2105         // ignore anything in a code block
2106         $string = preg_replace('/\[code.*?\].*?\[\/code\]/sm', '', $string);
2107
2108         // Force line feeds at bbtags
2109         $string = str_replace(['[', ']'], ["\n[", "]\n"], $string);
2110
2111         // ignore anything in a bbtag
2112         $string = preg_replace('/\[(.*?)\]/sm', '', $string);
2113
2114         // Match full names against @tags including the space between first and last
2115         // We will look these up afterward to see if they are full names or not recognisable.
2116
2117         if (preg_match_all('/(@[^ \x0D\x0A,:?]+ [^ \x0D\x0A@,:?]+)([ \x0D\x0A@,:?]|$)/', $string, $matches)) {
2118             foreach ($matches[1] as $match) {
2119                 if (strstr($match, ']')) {
2120                     // we might be inside a bbcode color tag - leave it alone
2121                     continue;
2122                 }
2123
2124                 if (substr($match, -1, 1) === '.') {
2125                     $ret[] = substr($match, 0, -1);
2126                 } else {
2127                     $ret[] = $match;
2128                 }
2129             }
2130         }
2131
2132         // Otherwise pull out single word tags. These can be @nickname, @first_last
2133         // and #hash tags.
2134
2135         if (preg_match_all('/([!#@][^\^ \x0D\x0A,;:?]+)([ \x0D\x0A,;:?]|$)/', $string, $matches)) {
2136             foreach ($matches[1] as $match) {
2137                 if (strstr($match, ']')) {
2138                     // we might be inside a bbcode color tag - leave it alone
2139                     continue;
2140                 }
2141                 if (substr($match, -1, 1) === '.') {
2142                     $match = substr($match,0,-1);
2143                 }
2144                 // ignore strictly numeric tags like #1
2145                 if ((strpos($match, '#') === 0) && ctype_digit(substr($match, 1))) {
2146                     continue;
2147                 }
2148                 // try not to catch url fragments
2149                 if (strpos($string, $match) && preg_match('/[a-zA-z0-9\/]/', substr($string, strpos($string, $match) - 1, 1))) {
2150                     continue;
2151                 }
2152                 $ret[] = $match;
2153             }
2154         }
2155
2156         return $ret;
2157     }
2158 }