src/Util/ParseUrl.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2022, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Util;
  23
  24 use DOMDocument;
  25 use DOMXPath;
  26 use Friendica\Content\OEmbed;
  27 use Friendica\Core\Hook;
  28 use Friendica\Core\Logger;
  29 use Friendica\Database\Database;
  30 use Friendica\Database\DBA;
  31 use Friendica\DI;
  32 use Friendica\Network\HTTPClient\Client\HttpClientAccept;
  33 use Friendica\Network\HTTPException;
  34 use Friendica\Network\HTTPClient\Client\HttpClientOptions;
  35
  36 /**
  37  * Get information about a given URL
  38  *
  39  * Class with methods for extracting certain content from an url
  40  */
  41 class ParseUrl
  42 {
  43         const DEFAULT_EXPIRATION_FAILURE = 'now + 1 day';
  44         const DEFAULT_EXPIRATION_SUCCESS = 'now + 3 months';
  45
  46         /**
  47          * Maximum number of characters for the description
  48          */
  49         const MAX_DESC_COUNT = 250;
  50
  51         /**
  52          * Minimum number of characters for the description
  53          */
  54         const MIN_DESC_COUNT = 100;
  55
  56         /**
  57          * Fetch the content type of the given url
  58          * @param string $url    URL of the page
  59          * @param string $accept content-type to accept
  60          * @param int    $timeout
  61          * @return array content type
  62          */
  63         public static function getContentType(string $url, string $accept = HttpClientAccept::DEFAULT, int $timeout = 0): array
  64         {
  65                 if (!empty($timeout)) {
  66                         $options = [HttpClientOptions::TIMEOUT => $timeout];
  67                 } else {
  68                         $options = [];
  69                 }
  70
  71                 $curlResult = DI::httpClient()->head($url, array_merge([HttpClientOptions::ACCEPT_CONTENT => $accept], $options));
  72
  73                 // Workaround for systems that can't handle a HEAD request. Don't retry on timeouts.
  74                 if (!$curlResult->isSuccess() && ($curlResult->getReturnCode() >= 400) && !in_array($curlResult->getReturnCode(), [408, 504])) {
  75                         $curlResult = DI::httpClient()->get($url, $accept, array_merge([HttpClientOptions::CONTENT_LENGTH => 1000000], $options));
  76                 }
  77
  78                 if (!$curlResult->isSuccess()) {
  79                         Logger::debug('Got HTTP Error', ['http error' => $curlResult->getReturnCode(), 'url' => $url]);
  80                         return [];
  81                 }
  82
  83                 $contenttype =  $curlResult->getHeader('Content-Type')[0] ?? '';
  84                 if (empty($contenttype)) {
  85                         return ['application', 'octet-stream'];
  86                 }
  87
  88                 return explode('/', current(explode(';', $contenttype)));
  89         }
  90
  91         /**
  92          * Search for chached embeddable data of an url otherwise fetch it
  93          *
  94          * @param string $url         The url of the page which should be scraped
  95          * @param bool   $do_oembed   The false option is used by the function fetch_oembed()
  96          *                            to avoid endless loops
  97          *
  98          * @return array which contains needed data for embedding
  99          *    string 'url'      => The url of the parsed page
 100          *    string 'type'     => Content type
 101          *    string 'title'    => (optional) The title of the content
 102          *    string 'text'     => (optional) The description for the content
 103          *    string 'image'    => (optional) A preview image of the content
 104          *    array  'images'   => (optional) Array of preview pictures
 105          *    string 'keywords' => (optional) The tags which belong to the content
 106          *
 107          * @throws HTTPException\InternalServerErrorException
 108          * @see   ParseUrl::getSiteinfo() for more information about scraping
 109          * embeddable content
 110          */
 111         public static function getSiteinfoCached(string $url, bool $do_oembed = true): array
 112         {
 113                 if (empty($url)) {
 114                         return [
 115                                 'url' => '',
 116                                 'type' => 'error',
 117                         ];
 118                 }
 119
 120                 $urlHash = hash('sha256', $url);
 121
 122                 $parsed_url = DBA::selectFirst('parsed_url', ['content'],
 123                         ['url_hash' => $urlHash, 'oembed' => $do_oembed]
 124                 );
 125                 if (!empty($parsed_url['content'])) {
 126                         $data = unserialize($parsed_url['content']);
 127                         return $data;
 128                 }
 129
 130                 $data = self::getSiteinfo($url, $do_oembed);
 131
 132                 $expires = $data['expires'];
 133
 134                 unset($data['expires']);
 135
 136                 DI::dba()->insert(
 137                         'parsed_url',
 138                         [
 139                                 'url_hash' => $urlHash,
 140                                 'oembed'   => $do_oembed,
 141                                 'url'      => $url,
 142                                 'content'  => serialize($data),
 143                                 'created'  => DateTimeFormat::utcNow(),
 144                                 'expires'  => $expires,
 145                         ],
 146                         Database::INSERT_UPDATE
 147                 );
 148
 149                 return $data;
 150         }
 151
 152         /**
 153          * Parse a page for embeddable content information
 154          *
 155          * This method parses to url for meta data which can be used to embed
 156          * the content. If available it prioritizes Open Graph meta tags.
 157          * If this is not available it uses the twitter cards meta tags.
 158          * As fallback it uses standard html elements with meta informations
 159          * like \<title\>Awesome Title\</title\> or
 160          * \<meta name="description" content="An awesome description"\>
 161          *
 162          * @param string $url         The url of the page which should be scraped
 163          * @param bool   $do_oembed   The false option is used by the function fetch_oembed()
 164          *                            to avoid endless loops
 165          * @param int    $count       Internal counter to avoid endless loops
 166          *
 167          * @return array which contains needed data for embedding
 168          *    string 'url'      => The url of the parsed page
 169          *    string 'type'     => Content type (error, link, photo, image, audio, video)
 170          *    string 'title'    => (optional) The title of the content
 171          *    string 'text'     => (optional) The description for the content
 172          *    string 'image'    => (optional) A preview image of the content
 173          *    array  'images'   => (optional) Array of preview pictures
 174          *    string 'keywords' => (optional) The tags which belong to the content
 175          *
 176          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 177          * @todo  https://developers.google.com/+/plugins/snippet/
 178          * @verbatim
 179          * <meta itemprop="name" content="Awesome title">
 180          * <meta itemprop="description" content="An awesome description">
 181          * <meta itemprop="image" content="http://maple.libertreeproject.org/images/tree-icon.png">
 182          *
 183          * <body itemscope itemtype="http://schema.org/Product">
 184          *   <h1 itemprop="name">Shiny Trinket</h1>
 185          *   <img itemprop="image" src="{image-url}" />
 186          *   <p itemprop="description">Shiny trinkets are shiny.</p>
 187          * </body>
 188          * @endverbatim
 189          */
 190         public static function getSiteinfo(string $url, bool $do_oembed = true, int $count = 1): array
 191         {
 192                 if (empty($url)) {
 193                         return [
 194                                 'url' => '',
 195                                 'type' => 'error',
 196                         ];
 197                 }
 198
 199                 // Check if the URL does contain a scheme
 200                 $scheme = parse_url($url, PHP_URL_SCHEME);
 201
 202                 if ($scheme == '') {
 203                         $url = 'http://' . ltrim($url, '/');
 204                 }
 205
 206                 $url = trim($url, "'\"");
 207
 208                 $url = Network::stripTrackingQueryParams($url);
 209
 210                 $siteinfo = [
 211                         'url' => $url,
 212                         'type' => 'link',
 213                         'expires' => DateTimeFormat::utc(self::DEFAULT_EXPIRATION_FAILURE),
 214                 ];
 215
 216                 if ($count > 10) {
 217                         Logger::notice('Endless loop detected', ['url' => $url]);
 218                         return $siteinfo;
 219                 }
 220
 221                 $type = self::getContentType($url);
 222                 Logger::info('Got content-type', ['content-type' => $type, 'url' => $url]);
 223                 if (!empty($type) && in_array($type[0], ['image', 'video', 'audio'])) {
 224                         $siteinfo['type'] = $type[0];
 225                         return $siteinfo;
 226                 }
 227
 228                 if ((count($type) >= 2) && (($type[0] != 'text') || ($type[1] != 'html'))) {
 229                         Logger::info('Unparseable content-type, quitting here, ', ['content-type' => $type, 'url' => $url]);
 230                         return $siteinfo;
 231                 }
 232
 233                 $curlResult = DI::httpClient()->get($url, HttpClientAccept::HTML, [HttpClientOptions::CONTENT_LENGTH => 1000000]);
 234                 if (!$curlResult->isSuccess() || empty($curlResult->getBody())) {
 235                         Logger::info('Empty body or error when fetching', ['url' => $url, 'success' => $curlResult->isSuccess(), 'code' => $curlResult->getReturnCode()]);
 236                         return $siteinfo;
 237                 }
 238
 239                 $siteinfo['expires'] = DateTimeFormat::utc(self::DEFAULT_EXPIRATION_SUCCESS);
 240
 241                 if ($cacheControlHeader = $curlResult->getHeader('Cache-Control')[0] ?? '') {
 242                         if (preg_match('/max-age=([0-9]+)/i', $cacheControlHeader, $matches)) {
 243                                 $maxAge = max(86400, (int)array_pop($matches));
 244                                 $siteinfo['expires'] = DateTimeFormat::utc("now + $maxAge seconds");
 245                         }
 246                 }
 247
 248                 $body = $curlResult->getBody();
 249
 250                 if ($do_oembed) {
 251                         $oembed_data = OEmbed::fetchURL($url, false, false);
 252
 253                         if (!empty($oembed_data->type)) {
 254                                 if (!in_array($oembed_data->type, ['error', 'rich', 'image', 'video', 'audio', ''])) {
 255                                         $siteinfo['type'] = $oembed_data->type;
 256                                 }
 257
 258                                 // See https://github.com/friendica/friendica/pull/5763#discussion_r217913178
 259                                 if ($siteinfo['type'] != 'photo') {
 260                                         if (!empty($oembed_data->title)) {
 261                                                 $siteinfo['title'] = trim($oembed_data->title);
 262                                         }
 263                                         if (!empty($oembed_data->description)) {
 264                                                 $siteinfo['text'] = trim($oembed_data->description);
 265                                         }
 266                                         if (!empty($oembed_data->author_name)) {
 267                                                 $siteinfo['author_name'] = trim($oembed_data->author_name);
 268                                         }
 269                                         if (!empty($oembed_data->author_url)) {
 270                                                 $siteinfo['author_url'] = trim($oembed_data->author_url);
 271                                         }
 272                                         if (!empty($oembed_data->provider_name)) {
 273                                                 $siteinfo['publisher_name'] = trim($oembed_data->provider_name);
 274                                         }
 275                                         if (!empty($oembed_data->provider_url)) {
 276                                                 $siteinfo['publisher_url'] = trim($oembed_data->provider_url);
 277                                         }
 278                                         if (!empty($oembed_data->thumbnail_url)) {
 279                                                 $siteinfo['image'] = $oembed_data->thumbnail_url;
 280                                         }
 281                                 }
 282                         }
 283                 }
 284
 285                 $charset = '';
 286                 // Look for a charset, first in headers
 287                 // Expected form: Content-Type: text/html; charset=ISO-8859-4
 288                 if (preg_match('/charset=([a-z0-9-_.\/]+)/i', $curlResult->getContentType(), $matches)) {
 289                         $charset = trim(trim(trim(array_pop($matches)), ';,'));
 290                 }
 291
 292                 // Then in body that gets precedence
 293                 // Expected forms:
 294                 // - <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 295                 // - <meta charset="utf-8">
 296                 // - <meta charset=utf-8>
 297                 // - <meta charSet="utf-8">
 298                 // We escape <style> and <script> tags since they can contain irrelevant charset information
 299                 // (see https://github.com/friendica/friendica/issues/9251#issuecomment-698636806)
 300                 Strings::performWithEscapedBlocks($body, '#<(?:style|script).*?</(?:style|script)>#ism', function ($body) use (&$charset) {
 301                         if (preg_match('/charset=["\']?([a-z0-9-_.\/]+)/i', $body, $matches)) {
 302                                 $charset = trim(trim(trim(array_pop($matches)), ';,'));
 303                         }
 304                 });
 305
 306                 $siteinfo['charset'] = $charset;
 307
 308                 if ($charset && strtoupper($charset) != 'UTF-8') {
 309                         // See https://github.com/friendica/friendica/issues/5470#issuecomment-418351211
 310                         $charset = str_ireplace('latin-1', 'latin1', $charset);
 311
 312                         Logger::info('detected charset', ['charset' => $charset]);
 313                         $body = iconv($charset, 'UTF-8//TRANSLIT', $body);
 314                 }
 315
 316                 $body = mb_convert_encoding($body, 'HTML-ENTITIES', 'UTF-8');
 317
 318                 if (empty($body)) {
 319                         return $siteinfo;
 320                 }
 321
 322                 $doc = new DOMDocument();
 323                 @$doc->loadHTML($body);
 324
 325                 XML::deleteNode($doc, 'style');
 326                 XML::deleteNode($doc, 'option');
 327                 XML::deleteNode($doc, 'h1');
 328                 XML::deleteNode($doc, 'h2');
 329                 XML::deleteNode($doc, 'h3');
 330                 XML::deleteNode($doc, 'h4');
 331                 XML::deleteNode($doc, 'h5');
 332                 XML::deleteNode($doc, 'h6');
 333                 XML::deleteNode($doc, 'ol');
 334                 XML::deleteNode($doc, 'ul');
 335
 336                 $xpath = new DOMXPath($doc);
 337
 338                 $list = $xpath->query('//meta[@content]');
 339                 foreach ($list as $node) {
 340                         $meta_tag = [];
 341                         if ($node->attributes->length) {
 342                                 foreach ($node->attributes as $attribute) {
 343                                         $meta_tag[$attribute->name] = $attribute->value;
 344                                 }
 345                         }
 346
 347                         if (@$meta_tag['http-equiv'] == 'refresh') {
 348                                 $path = $meta_tag['content'];
 349                                 $pathinfo = explode(';', $path);
 350                                 $content = '';
 351                                 foreach ($pathinfo as $value) {
 352                                         if (substr(strtolower($value), 0, 4) == 'url=') {
 353                                                 $content = substr($value, 4);
 354                                         }
 355                                 }
 356                                 if ($content != '') {
 357                                         $siteinfo = self::getSiteinfo($content, $do_oembed, ++$count);
 358                                         return $siteinfo;
 359                                 }
 360                         }
 361                 }
 362
 363                 $list = $xpath->query('//title');
 364                 if ($list->length > 0) {
 365                         $siteinfo['title'] = trim($list->item(0)->nodeValue);
 366                 }
 367
 368                 $list = $xpath->query('//meta[@name]');
 369                 foreach ($list as $node) {
 370                         $meta_tag = [];
 371                         if ($node->attributes->length) {
 372                                 foreach ($node->attributes as $attribute) {
 373                                         $meta_tag[$attribute->name] = $attribute->value;
 374                                 }
 375                         }
 376
 377                         if (empty($meta_tag['content'])) {
 378                                 continue;
 379                         }
 380
 381                         $meta_tag['content'] = trim(html_entity_decode($meta_tag['content'], ENT_QUOTES, 'UTF-8'));
 382
 383                         switch (strtolower($meta_tag['name'])) {
 384                                 case 'fulltitle':
 385                                         $siteinfo['title'] = trim($meta_tag['content']);
 386                                         break;
 387                                 case 'description':
 388                                         $siteinfo['text'] = trim($meta_tag['content']);
 389                                         break;
 390                                 case 'thumbnail':
 391                                         $siteinfo['image'] = $meta_tag['content'];
 392                                         break;
 393                                 case 'twitter:image':
 394                                         $siteinfo['image'] = $meta_tag['content'];
 395                                         break;
 396                                 case 'twitter:image:src':
 397                                         $siteinfo['image'] = $meta_tag['content'];
 398                                         break;
 399                                 case 'twitter:description':
 400                                         $siteinfo['text'] = trim($meta_tag['content']);
 401                                         break;
 402                                 case 'twitter:title':
 403                                         $siteinfo['title'] = trim($meta_tag['content']);
 404                                         break;
 405                                 case 'twitter:player':
 406                                         $siteinfo['player']['embed'] = trim($meta_tag['content']);
 407                                         break;
 408                                 case 'twitter:player:stream':
 409                                         $siteinfo['player']['stream'] = trim($meta_tag['content']);
 410                                         break;
 411                                 case 'twitter:player:width':
 412                                         $siteinfo['player']['width'] = intval($meta_tag['content']);
 413                                         break;
 414                                 case 'twitter:player:height':
 415                                         $siteinfo['player']['height'] = intval($meta_tag['content']);
 416                                         break;
 417                                 case 'dc.title':
 418                                         $siteinfo['title'] = trim($meta_tag['content']);
 419                                         break;
 420                                 case 'dc.description':
 421                                         $siteinfo['text'] = trim($meta_tag['content']);
 422                                         break;
 423                                 case 'dc.creator':
 424                                         $siteinfo['publisher_name'] = trim($meta_tag['content']);
 425                                         break;
 426                                 case 'keywords':
 427                                         $keywords = explode(',', $meta_tag['content']);
 428                                         break;
 429                                 case 'news_keywords':
 430                                         $keywords = explode(',', $meta_tag['content']);
 431                                         break;
 432                         }
 433                 }
 434
 435                 if (isset($keywords)) {
 436                         $siteinfo['keywords'] = [];
 437                         foreach ($keywords as $keyword) {
 438                                 if (!in_array(trim($keyword), $siteinfo['keywords'])) {
 439                                         $siteinfo['keywords'][] = trim($keyword);
 440                                 }
 441                         }
 442                 }
 443
 444                 $list = $xpath->query('//meta[@property]');
 445                 foreach ($list as $node) {
 446                         $meta_tag = [];
 447                         if ($node->attributes->length) {
 448                                 foreach ($node->attributes as $attribute) {
 449                                         $meta_tag[$attribute->name] = $attribute->value;
 450                                 }
 451                         }
 452
 453                         if (!empty($meta_tag['content'])) {
 454                                 $meta_tag['content'] = trim(html_entity_decode($meta_tag['content'], ENT_QUOTES, 'UTF-8'));
 455
 456                                 switch (strtolower($meta_tag['property'])) {
 457                                         case 'og:image':
 458                                                 $siteinfo['image'] = $meta_tag['content'];
 459                                                 break;
 460                                         case 'og:image:url':
 461                                                 $siteinfo['image'] = $meta_tag['content'];
 462                                                 break;
 463                                         case 'og:image:secure_url':
 464                                                 $siteinfo['image'] = $meta_tag['content'];
 465                                                 break;
 466                                         case 'og:title':
 467                                                 $siteinfo['title'] = trim($meta_tag['content']);
 468                                                 break;
 469                                         case 'og:description':
 470                                                 $siteinfo['text'] = trim($meta_tag['content']);
 471                                                 break;
 472                                         case 'og:site_name':
 473                                                 $siteinfo['publisher_name'] = trim($meta_tag['content']);
 474                                                 break;
 475                                         case 'og:locale':
 476                                                 $siteinfo['language'] = trim($meta_tag['content']);
 477                                                 break;
 478                                         case 'og:type':
 479                                                 $siteinfo['pagetype'] = trim($meta_tag['content']);
 480                                                 break;
 481                                         case 'twitter:description':
 482                                                 $siteinfo['text'] = trim($meta_tag['content']);
 483                                                 break;
 484                                         case 'twitter:title':
 485                                                 $siteinfo['title'] = trim($meta_tag['content']);
 486                                                 break;
 487                                         case 'twitter:image':
 488                                                 $siteinfo['image'] = $meta_tag['content'];
 489                                                 break;
 490                                 }
 491                         }
 492                 }
 493
 494                 $list = $xpath->query("//script[@type='application/ld+json']");
 495                 foreach ($list as $node) {
 496                         if (!empty($node->nodeValue)) {
 497                                 if ($jsonld = json_decode($node->nodeValue, true)) {
 498                                         $siteinfo = self::parseParts($siteinfo, $jsonld);
 499                                 }
 500                         }
 501                 }
 502
 503                 if (!empty($siteinfo['player']['stream'])) {
 504                         // Only add player data to media arrays if there is no duplicate
 505                         $content_urls = array_merge(array_column($siteinfo['audio'] ?? [], 'content'), array_column($siteinfo['video'] ?? [], 'content'));
 506                         if (!in_array($siteinfo['player']['stream'], $content_urls)) {
 507                                 $contenttype = self::getContentType($siteinfo['player']['stream']);
 508                                 if (!empty($contenttype[0]) && in_array($contenttype[0], ['audio', 'video'])) {
 509                                         $media = ['content' => $siteinfo['player']['stream']];
 510
 511                                         if (!empty($siteinfo['player']['embed'])) {
 512                                                 $media['embed'] = $siteinfo['player']['embed'];
 513                                         }
 514
 515                                         $siteinfo[$contenttype[0]][] = $media;
 516                                 }
 517                         }
 518                 }
 519
 520                 if (!empty($siteinfo['image'])) {
 521                         $siteinfo['images'] = $siteinfo['images'] ?? [];
 522                         array_unshift($siteinfo['images'], ['url' => $siteinfo['image']]);
 523                         unset($siteinfo['image']);
 524                 }
 525
 526                 $siteinfo = self::checkMedia($url, $siteinfo);
 527
 528                 if (!empty($siteinfo['text']) && mb_strlen($siteinfo['text']) > self::MAX_DESC_COUNT) {
 529                         $siteinfo['text'] = mb_substr($siteinfo['text'], 0, self::MAX_DESC_COUNT) . '…';
 530                         $pos = mb_strrpos($siteinfo['text'], '.');
 531                         if ($pos > self::MIN_DESC_COUNT) {
 532                                 $siteinfo['text'] = mb_substr($siteinfo['text'], 0, $pos + 1);
 533                         }
 534                 }
 535
 536                 Logger::info('Siteinfo fetched', ['url' => $url, 'siteinfo' => $siteinfo]);
 537
 538                 Hook::callAll('getsiteinfo', $siteinfo);
 539
 540                 ksort($siteinfo);
 541
 542                 return $siteinfo;
 543         }
 544
 545         /**
 546          * Check the attached media elements.
 547          * Fix existing data and add missing data.
 548          *
 549          * @param string $page_url
 550          * @param array $siteinfo
 551          * @return array
 552          */
 553         private static function checkMedia(string $page_url, array $siteinfo) : array
 554         {
 555                 if (!empty($siteinfo['images'])) {
 556                         array_walk($siteinfo['images'], function (&$image) use ($page_url) {
 557                                 /*
 558                                  * According to the specifications someone could place a picture
 559                                  * URL into the content field as well. But this doesn't seem to
 560                                  * happen in the wild, so we don't cover it here.
 561                                  */
 562                                 if (!empty($image['url'])) {
 563                                         $image['url'] = self::completeUrl($image['url'], $page_url);
 564                                         $photodata = Images::getInfoFromURLCached($image['url']);
 565                                         if (($photodata) && ($photodata[0] > 50) && ($photodata[1] > 50)) {
 566                                                 $image['src'] = $image['url'];
 567                                                 $image['width'] = $photodata[0];
 568                                                 $image['height'] = $photodata[1];
 569                                                 $image['contenttype'] = $photodata['mime'];
 570                                                 unset($image['url']);
 571                                                 ksort($image);
 572                                         } else {
 573                                                 $image = [];
 574                                         }
 575                                 } else {
 576                                         $image = [];
 577                                 }
 578                         });
 579
 580                         $siteinfo['images'] = array_values(array_filter($siteinfo['images']));
 581                 }
 582
 583                 foreach (['audio', 'video'] as $element) {
 584                         if (!empty($siteinfo[$element])) {
 585                                 array_walk($siteinfo[$element], function (&$media) use ($page_url, &$siteinfo) {
 586                                         $url = '';
 587                                         $embed = '';
 588                                         $content = '';
 589                                         $contenttype = '';
 590                                         foreach (['embed', 'content', 'url'] as $field) {
 591                                                 if (!empty($media[$field])) {
 592                                                         $media[$field] = self::completeUrl($media[$field], $page_url);
 593                                                         $type = self::getContentType($media[$field]);
 594                                                         if (($type[0] ?? '') == 'text') {
 595                                                                 if ($field == 'embed') {
 596                                                                         $embed = $media[$field];
 597                                                                 } else {
 598                                                                         $url = $media[$field];
 599                                                                 }
 600                                                         } elseif (!empty($type[0])) {
 601                                                                 $content = $media[$field];
 602                                                                 $contenttype = implode('/', $type);
 603                                                         }
 604                                                 }
 605                                                 unset($media[$field]);
 606                                         }
 607
 608                                         foreach (['image', 'preview'] as $field) {
 609                                                 if (!empty($media[$field])) {
 610                                                         $media[$field] = self::completeUrl($media[$field], $page_url);
 611                                                 }
 612                                         }
 613
 614                                         if (!empty($url)) {
 615                                                 $media['url'] = $url;
 616                                         }
 617                                         if (!empty($embed)) {
 618                                                 $media['embed'] = $embed;
 619                                                 if (empty($siteinfo['player']['embed'])) {
 620                                                         $siteinfo['player']['embed'] = $embed;
 621                                                 }
 622                                         }
 623                                         if (!empty($content)) {
 624                                                 $media['src'] = $content;
 625                                         }
 626                                         if (!empty($contenttype)) {
 627                                                 $media['contenttype'] = $contenttype;
 628                                         }
 629                                         if (empty($url) && empty($content) && empty($embed)) {
 630                                                 $media = [];
 631                                         }
 632                                         ksort($media);
 633                                 });
 634
 635                                 $siteinfo[$element] = array_values(array_filter($siteinfo[$element]));
 636                         }
 637                         if (empty($siteinfo[$element])) {
 638                                 unset($siteinfo[$element]);
 639                         }
 640                 }
 641                 return $siteinfo;
 642         }
 643
 644         /**
 645          * Convert tags from CSV to an array
 646          *
 647          * @param string $string Tags
 648          *
 649          * @return array with formatted Hashtags
 650          */
 651         public static function convertTagsToArray(string $string): array
 652         {
 653                 $arr_tags = str_getcsv($string);
 654                 if (count($arr_tags)) {
 655                         // add the # sign to every tag
 656                         array_walk($arr_tags, ['self', 'arrAddHashes']);
 657
 658                         return $arr_tags;
 659                 }
 660                 return [];
 661         }
 662
 663         /**
 664          * Add a hasht sign to a string
 665          *
 666          * This method is used as callback function
 667          *
 668          * @param string $tag The pure tag name
 669          * @param int    $k   Counter for internal use
 670          *
 671          * @return void
 672          */
 673         private static function arrAddHashes(string &$tag, int $k)
 674         {
 675                 $tag = '#' . $tag;
 676         }
 677
 678         /**
 679          * Add a scheme to an url
 680          *
 681          * The src attribute of some html elements (e.g. images)
 682          * can miss the scheme so we need to add the correct
 683          * scheme
 684          *
 685          * @param string $url    The url which possibly does have
 686          *                       a missing scheme (a link to an image)
 687          * @param string $scheme The url with a correct scheme
 688          *                       (e.g. the url from the webpage which does contain the image)
 689          *
 690          * @return string The url with a scheme
 691          */
 692         private static function completeUrl(string $url, string $scheme): string
 693         {
 694                 $urlarr = parse_url($url);
 695
 696                 // If the url does allready have an scheme
 697                 // we can stop the process here
 698                 if (isset($urlarr['scheme'])) {
 699                         return $url;
 700                 }
 701
 702                 $schemearr = parse_url($scheme);
 703
 704                 $complete = $schemearr['scheme'] . '://' . $schemearr['host'];
 705
 706                 if (!empty($schemearr['port'])) {
 707                         $complete .= ':' . $schemearr['port'];
 708                 }
 709
 710                 if (!empty($urlarr['path'])) {
 711                         if (strpos($urlarr['path'], '/') !== 0) {
 712                                 $complete .= '/';
 713                         }
 714
 715                         $complete .= $urlarr['path'];
 716                 }
 717
 718                 if (!empty($urlarr['query'])) {
 719                         $complete .= '?' . $urlarr['query'];
 720                 }
 721
 722                 if (!empty($urlarr['fragment'])) {
 723                         $complete .= '#' . $urlarr['fragment'];
 724                 }
 725
 726                 return $complete;
 727         }
 728
 729         /**
 730          * Parse the Json-Ld parts of a web page
 731          *
 732          * @param array $siteinfo
 733          * @param array $jsonld
 734          *
 735          * @return array siteinfo
 736          */
 737         private static function parseParts(array $siteinfo, array $jsonld): array
 738         {
 739                 if (!empty($jsonld['@graph']) && is_array($jsonld['@graph'])) {
 740                         foreach ($jsonld['@graph'] as $part) {
 741                                 if (!empty($part) && is_array($part)) {
 742                                         $siteinfo = self::parseParts($siteinfo, $part);
 743                                 }
 744                         }
 745                 } elseif (!empty($jsonld['@type'])) {
 746                         $siteinfo = self::parseJsonLd($siteinfo, $jsonld);
 747                 } elseif (!empty($jsonld)) {
 748                         $keys = array_keys($jsonld);
 749                         $numeric_keys = true;
 750                         foreach ($keys as $key) {
 751                                 if (!is_int($key)) {
 752                                         $numeric_keys = false;
 753                                 }
 754                         }
 755                         if ($numeric_keys) {
 756                                 foreach ($jsonld as $part) {
 757                                         if (!empty($part) && is_array($part)) {
 758                                                 $siteinfo = self::parseParts($siteinfo, $part);
 759                                         }
 760                                 }
 761                         }
 762                 }
 763
 764                 array_walk_recursive($siteinfo, function (&$element) {
 765                         if (is_string($element)) {
 766                                 $element = trim(strip_tags(html_entity_decode($element, ENT_COMPAT, 'UTF-8')));
 767                         }
 768                 });
 769
 770                 return $siteinfo;
 771         }
 772
 773         /**
 774          * Improve the siteinfo with information from the provided JSON-LD information
 775          * @see https://jsonld.com/
 776          * @see https://schema.org/
 777          *
 778          * @param array $siteinfo
 779          * @param array $jsonld
 780          *
 781          * @return array siteinfo
 782          */
 783         private static function parseJsonLd(array $siteinfo, array $jsonld): array
 784         {
 785                 $type = JsonLD::fetchElement($jsonld, '@type');
 786                 if (empty($type)) {
 787                         Logger::info('Empty type', ['url' => $siteinfo['url']]);
 788                         return $siteinfo;
 789                 }
 790
 791                 // Silently ignore some types that aren't processed
 792                 if (in_array($type, ['SiteNavigationElement', 'JobPosting', 'CreativeWork', 'MusicAlbum',
 793                         'WPHeader', 'WPSideBar', 'WPFooter', 'LegalService', 'MusicRecording',
 794                         'ItemList', 'BreadcrumbList', 'Blog', 'Dataset', 'Product'])) {
 795                         return $siteinfo;
 796                 }
 797
 798                 switch ($type) {
 799                         case 'Article':
 800                         case 'AdvertiserContentArticle':
 801                         case 'NewsArticle':
 802                         case 'Report':
 803                         case 'SatiricalArticle':
 804                         case 'ScholarlyArticle':
 805                         case 'SocialMediaPosting':
 806                         case 'TechArticle':
 807                         case 'ReportageNewsArticle':
 808                         case 'SocialMediaPosting':
 809                         case 'BlogPosting':
 810                         case 'LiveBlogPosting':
 811                         case 'DiscussionForumPosting':
 812                                 return self::parseJsonLdArticle($siteinfo, $jsonld);
 813                         case 'WebPage':
 814                         case 'AboutPage':
 815                         case 'CheckoutPage':
 816                         case 'CollectionPage':
 817                         case 'ContactPage':
 818                         case 'FAQPage':
 819                         case 'ItemPage':
 820                         case 'MedicalWebPage':
 821                         case 'ProfilePage':
 822                         case 'QAPage':
 823                         case 'RealEstateListing':
 824                         case 'SearchResultsPage':
 825                         case 'MediaGallery':
 826                         case 'ImageGallery':
 827                         case 'VideoGallery':
 828                         case 'RadioEpisode':
 829                         case 'Event':
 830                                 return self::parseJsonLdWebPage($siteinfo, $jsonld);
 831                         case 'WebSite':
 832                                 return self::parseJsonLdWebSite($siteinfo, $jsonld);
 833                         case 'Organization':
 834                         case 'Airline':
 835                         case 'Consortium':
 836                         case 'Corporation':
 837                         case 'EducationalOrganization':
 838                         case 'FundingScheme':
 839                         case 'GovernmentOrganization':
 840                         case 'LibrarySystem':
 841                         case 'LocalBusiness':
 842                         case 'MedicalOrganization':
 843                         case 'NGO':
 844                         case 'NewsMediaOrganization':
 845                         case 'Project':
 846                         case 'SportsOrganization':
 847                         case 'WorkersUnion':
 848                                 return self::parseJsonLdWebOrganization($siteinfo, $jsonld);
 849                         case 'Person':
 850                         case 'Patient':
 851                         case 'PerformingGroup':
 852                         case 'DanceGroup';
 853                         case 'MusicGroup':
 854                         case 'TheaterGroup':
 855                                 return self::parseJsonLdWebPerson($siteinfo, $jsonld);
 856                         case 'AudioObject':
 857                         case 'Audio':
 858                                 return self::parseJsonLdMediaObject($siteinfo, $jsonld, 'audio');
 859                         case 'VideoObject':
 860                                 return self::parseJsonLdMediaObject($siteinfo, $jsonld, 'video');
 861                         case 'ImageObject':
 862                                 return self::parseJsonLdMediaObject($siteinfo, $jsonld, 'images');
 863                         default:
 864                                 Logger::info('Unknown type', ['type' => $type, 'url' => $siteinfo['url']]);
 865                                 return $siteinfo;
 866                 }
 867         }
 868
 869         /**
 870          * Fetch author and publisher data
 871          *
 872          * @param array $siteinfo
 873          * @param array $jsonld
 874          *
 875          * @return array siteinfo
 876          */
 877         private static function parseJsonLdAuthor(array $siteinfo, array $jsonld): array
 878         {
 879                 $jsonldinfo = [];
 880
 881                 if (!empty($jsonld['publisher']) && is_array($jsonld['publisher'])) {
 882                         $content = JsonLD::fetchElement($jsonld, 'publisher', 'name');
 883                         if (!empty($content) && is_string($content)) {
 884                                 $jsonldinfo['publisher_name'] = trim($content);
 885                         }
 886
 887                         $content = JsonLD::fetchElement($jsonld, 'publisher', 'url');
 888                         if (!empty($content) && is_string($content)) {
 889                                 $jsonldinfo['publisher_url'] = trim($content);
 890                         }
 891
 892                         $brand = JsonLD::fetchElement($jsonld, 'publisher', 'brand', '@type', 'Organization');
 893                         if (!empty($brand) && is_array($brand)) {
 894                                 $content = JsonLD::fetchElement($brand, 'name');
 895                                 if (!empty($content) && is_string($content)) {
 896                                         $jsonldinfo['publisher_name'] = trim($content);
 897                                 }
 898
 899                                 $content = JsonLD::fetchElement($brand, 'url');
 900                                 if (!empty($content) && is_string($content)) {
 901                                         $jsonldinfo['publisher_url'] = trim($content);
 902                                 }
 903
 904                                 $content = JsonLD::fetchElement($brand, 'logo', 'url');
 905                                 if (!empty($content) && is_string($content)) {
 906                                         $jsonldinfo['publisher_img'] = trim($content);
 907                                 }
 908                         }
 909
 910                         $logo = JsonLD::fetchElement($jsonld, 'publisher', 'logo');
 911                         if (!empty($logo) && is_array($logo)) {
 912                                 $content = JsonLD::fetchElement($logo, 'url');
 913                                 if (!empty($content) && is_string($content)) {
 914                                         $jsonldinfo['publisher_img'] = trim($content);
 915                                 }
 916                         }
 917                 } elseif (!empty($jsonld['publisher']) && is_string($jsonld['publisher'])) {
 918                         $jsonldinfo['publisher_name'] = trim($jsonld['publisher']);
 919                 }
 920
 921                 if (!empty($jsonld['author']) && is_array($jsonld['author'])) {
 922                         $content = JsonLD::fetchElement($jsonld, 'author', 'name');
 923                         if (!empty($content) && is_string($content)) {
 924                                 $jsonldinfo['author_name'] = trim($content);
 925                         }
 926
 927                         $content = JsonLD::fetchElement($jsonld, 'author', 'sameAs');
 928                         if (!empty($content) && is_string($content)) {
 929                                 $jsonldinfo['author_url'] = trim($content);
 930                         }
 931
 932                         $content = JsonLD::fetchElement($jsonld, 'author', 'url');
 933                         if (!empty($content) && is_string($content)) {
 934                                 $jsonldinfo['author_url'] = trim($content);
 935                         }
 936
 937                         $logo = JsonLD::fetchElement($jsonld, 'author', 'logo');
 938                         if (!empty($logo) && is_array($logo)) {
 939                                 $content = JsonLD::fetchElement($logo, 'url');
 940                                 if (!empty($content) && is_string($content)) {
 941                                         $jsonldinfo['author_img'] = trim($content);
 942                                 }
 943                         }
 944                 } elseif (!empty($jsonld['author']) && is_string($jsonld['author'])) {
 945                         $jsonldinfo['author_name'] = trim($jsonld['author']);
 946                 }
 947
 948                 Logger::info('Fetched Author information', ['fetched' => $jsonldinfo]);
 949
 950                 return array_merge($siteinfo, $jsonldinfo);
 951         }
 952
 953         /**
 954          * Fetch data from the provided JSON-LD Article type
 955          * @see https://schema.org/Article
 956          *
 957          * @param array $siteinfo
 958          * @param array $jsonld
 959          *
 960          * @return array siteinfo
 961          */
 962         private static function parseJsonLdArticle(array $siteinfo, array $jsonld): array
 963         {
 964                 $jsonldinfo = [];
 965
 966                 $content = JsonLD::fetchElement($jsonld, 'headline');
 967                 if (!empty($content) && is_string($content)) {
 968                         $jsonldinfo['title'] = trim($content);
 969                 }
 970
 971                 $content = JsonLD::fetchElement($jsonld, 'alternativeHeadline');
 972                 if (!empty($content) && is_string($content) && (($jsonldinfo['title'] ?? '') != trim($content))) {
 973                         $jsonldinfo['alternative_title'] = trim($content);
 974                 }
 975
 976                 $content = JsonLD::fetchElement($jsonld, 'description');
 977                 if (!empty($content) && is_string($content)) {
 978                         $jsonldinfo['text'] = trim($content);
 979                 }
 980
 981                 $content = JsonLD::fetchElement($jsonld, 'thumbnailUrl');
 982                 if (!empty($content)) {
 983                         $jsonldinfo['image'] = trim($content);
 984                 }
 985
 986                 $content = JsonLD::fetchElement($jsonld, 'image', 'url', '@type', 'ImageObject');
 987                 if (!empty($content) && is_string($content)) {
 988                         $jsonldinfo['image'] = trim($content);
 989                 }
 990
 991                 if (!empty($jsonld['keywords']) && !is_array($jsonld['keywords'])) {
 992                         $content = JsonLD::fetchElement($jsonld, 'keywords');
 993                         if (!empty($content)) {
 994                                 $siteinfo['keywords'] = [];
 995                                 $keywords = explode(',', $content);
 996                                 foreach ($keywords as $keyword) {
 997                                         $siteinfo['keywords'][] = trim($keyword);
 998                                 }
 999                         }
1000                 } elseif (!empty($jsonld['keywords'])) {
1001                         $content = JsonLD::fetchElementArray($jsonld, 'keywords');
1002                         if (!empty($content) && is_array($content)) {
1003                                 $jsonldinfo['keywords'] = $content;
1004                         }
1005                 }
1006
1007                 $content = JsonLD::fetchElement($jsonld, 'datePublished');
1008                 if (!empty($content) && is_string($content)) {
1009                         $jsonldinfo['published'] = DateTimeFormat::utc($content);
1010                 }
1011
1012                 $content = JsonLD::fetchElement($jsonld, 'dateModified');
1013                 if (!empty($content) && is_string($content)) {
1014                         $jsonldinfo['modified'] = DateTimeFormat::utc($content);
1015                 }
1016
1017                 $jsonldinfo = self::parseJsonLdAuthor($jsonldinfo, $jsonld);
1018
1019                 Logger::info('Fetched article information', ['url' => $siteinfo['url'], 'fetched' => $jsonldinfo]);
1020
1021                 return array_merge($siteinfo, $jsonldinfo);
1022         }
1023
1024         /**
1025          * Fetch data from the provided JSON-LD WebPage type
1026          * @see https://schema.org/WebPage
1027          *
1028          * @param array $siteinfo
1029          * @param array $jsonld
1030          *
1031          * @return array siteinfo
1032          */
1033         private static function parseJsonLdWebPage(array $siteinfo, array $jsonld): array
1034         {
1035                 $jsonldinfo = [];
1036
1037                 $content = JsonLD::fetchElement($jsonld, 'name');
1038                 if (!empty($content)) {
1039                         $jsonldinfo['title'] = trim($content);
1040                 }
1041
1042                 $content = JsonLD::fetchElement($jsonld, 'description');
1043                 if (!empty($content) && is_string($content)) {
1044                         $jsonldinfo['text'] = trim($content);
1045                 }
1046
1047                 $content = JsonLD::fetchElement($jsonld, 'image');
1048                 if (!empty($content) && is_string($content)) {
1049                         $jsonldinfo['image'] = trim($content);
1050                 }
1051
1052                 $content = JsonLD::fetchElement($jsonld, 'thumbnailUrl');
1053                 if (!empty($content) && is_string($content)) {
1054                         $jsonldinfo['image'] = trim($content);
1055                 }
1056
1057                 $jsonldinfo = self::parseJsonLdAuthor($jsonldinfo, $jsonld);
1058
1059                 Logger::info('Fetched WebPage information', ['url' => $siteinfo['url'], 'fetched' => $jsonldinfo]);
1060
1061                 return array_merge($siteinfo, $jsonldinfo);
1062         }
1063
1064         /**
1065          * Fetch data from the provided JSON-LD WebSite type
1066          * @see https://schema.org/WebSite
1067          *
1068          * @param array $siteinfo
1069          * @param array $jsonld
1070          *
1071          * @return array siteinfo
1072          */
1073         private static function parseJsonLdWebSite(array $siteinfo, array $jsonld): array
1074         {
1075                 $jsonldinfo = [];
1076
1077                 $content = JsonLD::fetchElement($jsonld, 'name');
1078                 if (!empty($content) && is_string($content)) {
1079                         $jsonldinfo['publisher_name'] = trim($content);
1080                 }
1081
1082                 $content = JsonLD::fetchElement($jsonld, 'description');
1083                 if (!empty($content) && is_string($content)) {
1084                         $jsonldinfo['publisher_description'] = trim($content);
1085                 }
1086
1087                 $content = JsonLD::fetchElement($jsonld, 'url');
1088                 if (!empty($content) && is_string($content)) {
1089                         $jsonldinfo['publisher_url'] = trim($content);
1090                 }
1091
1092                 $content = JsonLD::fetchElement($jsonld, 'thumbnailUrl');
1093                 if (!empty($content) && is_string($content)) {
1094                         $jsonldinfo['image'] = trim($content);
1095                 }
1096
1097                 $jsonldinfo = self::parseJsonLdAuthor($jsonldinfo, $jsonld);
1098
1099                 Logger::info('Fetched WebSite information', ['url' => $siteinfo['url'], 'fetched' => $jsonldinfo]);
1100                 return array_merge($siteinfo, $jsonldinfo);
1101         }
1102
1103         /**
1104          * Fetch data from the provided JSON-LD Organization type
1105          * @see https://schema.org/Organization
1106          *
1107          * @param array $siteinfo
1108          * @param array $jsonld
1109          *
1110          * @return array siteinfo
1111          */
1112         private static function parseJsonLdWebOrganization(array $siteinfo, array $jsonld): array
1113         {
1114                 $jsonldinfo = [];
1115
1116                 $content = JsonLD::fetchElement($jsonld, 'name');
1117                 if (!empty($content) && is_string($content)) {
1118                         $jsonldinfo['publisher_name'] = trim($content);
1119                 }
1120
1121                 $content = JsonLD::fetchElement($jsonld, 'description');
1122                 if (!empty($content) && is_string($content)) {
1123                         $jsonldinfo['publisher_description'] = trim($content);
1124                 }
1125
1126                 $content = JsonLD::fetchElement($jsonld, 'url');
1127                 if (!empty($content) && is_string($content)) {
1128                         $jsonldinfo['publisher_url'] = trim($content);
1129                 }
1130
1131                 $content = JsonLD::fetchElement($jsonld, 'logo', 'url', '@type', 'ImageObject');
1132                 if (!empty($content) && is_string($content)) {
1133                         $jsonldinfo['publisher_img'] = trim($content);
1134                 } elseif (!empty($content) && is_array($content)) {
1135                         $jsonldinfo['publisher_img'] = trim($content[0]);
1136                 }
1137
1138                 $content = JsonLD::fetchElement($jsonld, 'brand', 'name', '@type', 'Organization');
1139                 if (!empty($content) && is_string($content)) {
1140                         $jsonldinfo['publisher_name'] = trim($content);
1141                 }
1142
1143                 $content = JsonLD::fetchElement($jsonld, 'brand', 'url', '@type', 'Organization');
1144                 if (!empty($content) && is_string($content)) {
1145                         $jsonldinfo['publisher_url'] = trim($content);
1146                 }
1147
1148                 Logger::info('Fetched Organization information', ['url' => $siteinfo['url'], 'fetched' => $jsonldinfo]);
1149                 return array_merge($siteinfo, $jsonldinfo);
1150         }
1151
1152         /**
1153          * Fetch data from the provided JSON-LD Person type
1154          * @see https://schema.org/Person
1155          *
1156          * @param array $siteinfo
1157          * @param array $jsonld
1158          *
1159          * @return array siteinfo
1160          */
1161         private static function parseJsonLdWebPerson(array $siteinfo, array $jsonld): array
1162         {
1163                 $jsonldinfo = [];
1164
1165                 $content = JsonLD::fetchElement($jsonld, 'name');
1166                 if (!empty($content) && is_string($content)) {
1167                         $jsonldinfo['author_name'] = trim($content);
1168                 }
1169
1170                 $content = JsonLD::fetchElement($jsonld, 'description');
1171                 if (!empty($content) && is_string($content)) {
1172                         $jsonldinfo['author_description'] = trim($content);
1173                 }
1174
1175                 $content = JsonLD::fetchElement($jsonld, 'sameAs');
1176                 if (!empty($content) && is_string($content)) {
1177                         $jsonldinfo['author_url'] = trim($content);
1178                 }
1179
1180                 $content = JsonLD::fetchElement($jsonld, 'url');
1181                 if (!empty($content) && is_string($content)) {
1182                         $jsonldinfo['author_url'] = trim($content);
1183                 }
1184
1185                 $content = JsonLD::fetchElement($jsonld, 'image', 'url', '@type', 'ImageObject');
1186                 if (!empty($content) && !is_string($content)) {
1187                         Logger::notice('Unexpected return value for the author image', ['content' => $content]);
1188                 }
1189
1190                 if (!empty($content) && is_string($content)) {
1191                         $jsonldinfo['author_img'] = trim($content);
1192                 }
1193
1194                 Logger::info('Fetched Person information', ['url' => $siteinfo['url'], 'fetched' => $jsonldinfo]);
1195                 return array_merge($siteinfo, $jsonldinfo);
1196         }
1197
1198         /**
1199          * Fetch data from the provided JSON-LD MediaObject type
1200          * @see https://schema.org/MediaObject
1201          *
1202          * @param array $siteinfo
1203          * @param array $jsonld
1204          *
1205          * @return array siteinfo
1206          */
1207         private static function parseJsonLdMediaObject(array $siteinfo, array $jsonld, string $name): array
1208         {
1209                 $media = [];
1210
1211                 $content = JsonLD::fetchElement($jsonld, 'caption');
1212                 if (!empty($content) && is_string($content)) {
1213                         $media['caption'] = trim($content);
1214                 }
1215
1216                 $content = JsonLD::fetchElement($jsonld, 'url');
1217                 if (!empty($content) && is_string($content)) {
1218                         $media['url'] = trim($content);
1219                 }
1220
1221                 $content = JsonLD::fetchElement($jsonld, 'mainEntityOfPage');
1222                 if (!empty($content) && is_string($content)) {
1223                         $media['main'] = Strings::compareLink($content, $siteinfo['url']);
1224                 }
1225
1226                 $content = JsonLD::fetchElement($jsonld, 'description');
1227                 if (!empty($content) && is_string($content)) {
1228                         $media['description'] = trim($content);
1229                 }
1230
1231                 $content = JsonLD::fetchElement($jsonld, 'name');
1232                 if (!empty($content) && (($media['description'] ?? '') != trim($content))) {
1233                         $media['name'] = trim($content);
1234                 }
1235
1236                 $content = JsonLD::fetchElement($jsonld, 'contentUrl');
1237                 if (!empty($content) && is_string($content)) {
1238                         $media['content'] = trim($content);
1239                 }
1240
1241                 $content = JsonLD::fetchElement($jsonld, 'embedUrl');
1242                 if (!empty($content) && is_string($content)) {
1243                         $media['embed'] = trim($content);
1244                 }
1245
1246                 $content = JsonLD::fetchElement($jsonld, 'height');
1247                 if (!empty($content) && is_string($content)) {
1248                         $media['height'] = trim($content);
1249                 }
1250
1251                 $content = JsonLD::fetchElement($jsonld, 'width');
1252                 if (!empty($content) && is_string($content)) {
1253                         $media['width'] = trim($content);
1254                 }
1255
1256                 $content = JsonLD::fetchElement($jsonld, 'image');
1257                 if (!empty($content) && is_string($content)) {
1258                         $media['image'] = trim($content);
1259                 }
1260
1261                 $content = JsonLD::fetchElement($jsonld, 'thumbnailUrl');
1262                 if (!empty($content) && (($media['image'] ?? '') != trim($content))) {
1263                         if (!empty($media['image'])) {
1264                                 $media['preview'] = trim($content);
1265                         } else {
1266                                 $media['image'] = trim($content);
1267                         }
1268                 }
1269
1270                 Logger::info('Fetched Media information', ['url' => $siteinfo['url'], 'fetched' => $media]);
1271                 $siteinfo[$name][] = $media;
1272                 return $siteinfo;
1273         }
1274 }