src/Protocol/Feed.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, 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\Protocol;
  23
  24 use DOMDocument;
  25 use DOMXPath;
  26 use Friendica\Content\PageInfo;
  27 use Friendica\Content\Text\BBCode;
  28 use Friendica\Content\Text\HTML;
  29 use Friendica\Core\Cache\Enum\Duration;
  30 use Friendica\Core\Logger;
  31 use Friendica\Core\Protocol;
  32 use Friendica\Database\DBA;
  33 use Friendica\DI;
  34 use Friendica\Model\Contact;
  35 use Friendica\Model\Item;
  36 use Friendica\Model\Post;
  37 use Friendica\Model\Tag;
  38 use Friendica\Model\User;
  39 use Friendica\Util\DateTimeFormat;
  40 use Friendica\Util\Network;
  41 use Friendica\Util\ParseUrl;
  42 use Friendica\Util\Proxy;
  43 use Friendica\Util\Strings;
  44 use Friendica\Util\XML;
  45 use GuzzleHttp\Exception\TransferException;
  46
  47 /**
  48  * This class contain functions to import feeds (RSS/RDF/Atom)
  49  */
  50 class Feed
  51 {
  52         /**
  53          * Read a RSS/RDF/Atom feed and create an item entry for it
  54          *
  55          * @param string $xml      The feed data
  56          * @param array  $importer The user record of the importer
  57          * @param array  $contact  The contact record of the feed
  58          *
  59          * @return array Returns the header and the first item in dry run mode
  60          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  61          */
  62         public static function import($xml, array $importer = [], array $contact = [])
  63         {
  64                 $dryRun = empty($importer) && empty($contact);
  65
  66                 if ($dryRun) {
  67                         Logger::info("Test Atom/RSS feed");
  68                 } else {
  69                         Logger::info("Import Atom/RSS feed '" . $contact["name"] . "' (Contact " . $contact["id"] . ") for user " . $importer["uid"]);
  70                 }
  71
  72                 $xml = trim($xml);
  73
  74                 if (empty($xml)) {
  75                         Logger::info('XML is empty.');
  76                         return [];
  77                 }
  78
  79                 if (!empty($contact['poll'])) {
  80                         $basepath = $contact['poll'];
  81                 } elseif (!empty($contact['url'])) {
  82                         $basepath = $contact['url'];
  83                 } else {
  84                         $basepath = '';
  85                 }
  86
  87                 $doc = new DOMDocument();
  88                 @$doc->loadXML($xml);
  89                 $xpath = new DOMXPath($doc);
  90                 $xpath->registerNamespace('atom', ActivityNamespace::ATOM1);
  91                 $xpath->registerNamespace('dc', "http://purl.org/dc/elements/1.1/");
  92                 $xpath->registerNamespace('content', "http://purl.org/rss/1.0/modules/content/");
  93                 $xpath->registerNamespace('rdf', "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
  94                 $xpath->registerNamespace('rss', "http://purl.org/rss/1.0/");
  95                 $xpath->registerNamespace('media', "http://search.yahoo.com/mrss/");
  96                 $xpath->registerNamespace('poco', ActivityNamespace::POCO);
  97
  98                 $author = [];
  99                 $entries = null;
 100
 101                 // Is it RDF?
 102                 if ($xpath->query('/rdf:RDF/rss:channel')->length > 0) {
 103                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:link/text()');
 104                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:title/text()');
 105
 106                         if (empty($author["author-name"])) {
 107                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:description/text()');
 108                         }
 109                         $entries = $xpath->query('/rdf:RDF/rss:item');
 110                 }
 111
 112                 // Is it Atom?
 113                 if ($xpath->query('/atom:feed')->length > 0) {
 114                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']");
 115                         if (is_object($alternate)) {
 116                                 foreach ($alternate as $attribute) {
 117                                         if ($attribute->name == "href") {
 118                                                 $author["author-link"] = $attribute->textContent;
 119                                         }
 120                                 }
 121                         }
 122
 123                         if (empty($author["author-link"])) {
 124                                 $self = XML::getFirstAttributes($xpath, "atom:link[@rel='self']");
 125                                 if (is_object($self)) {
 126                                         foreach ($self as $attribute) {
 127                                                 if ($attribute->name == "href") {
 128                                                         $author["author-link"] = $attribute->textContent;
 129                                                 }
 130                                         }
 131                                 }
 132                         }
 133
 134                         if (empty($author["author-link"])) {
 135                                 $author["author-link"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:id/text()');
 136                         }
 137                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:logo/text()');
 138
 139                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:title/text()');
 140
 141                         if (empty($author["author-name"])) {
 142                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:subtitle/text()');
 143                         }
 144
 145                         if (empty($author["author-name"])) {
 146                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:name/text()');
 147                         }
 148
 149                         $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()');
 150                         if ($value != "") {
 151                                 $author["author-name"] = $value;
 152                         }
 153
 154                         if ($dryRun) {
 155                                 $author["author-id"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:id/text()');
 156
 157                                 // See https://tools.ietf.org/html/rfc4287#section-3.2.2
 158                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()');
 159                                 if ($value != "") {
 160                                         $author["author-link"] = $value;
 161                                 }
 162
 163                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()');
 164                                 if ($value != "") {
 165                                         $author["author-nick"] = $value;
 166                                 }
 167
 168                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:address/poco:formatted/text()');
 169                                 if ($value != "") {
 170                                         $author["author-location"] = $value;
 171                                 }
 172
 173                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:note/text()');
 174                                 if ($value != "") {
 175                                         $author["author-about"] = $value;
 176                                 }
 177
 178                                 $avatar = XML::getFirstAttributes($xpath, "atom:author/atom:link[@rel='avatar']");
 179                                 if (is_object($avatar)) {
 180                                         foreach ($avatar as $attribute) {
 181                                                 if ($attribute->name == "href") {
 182                                                         $author["author-avatar"] = $attribute->textContent;
 183                                                 }
 184                                         }
 185                                 }
 186                         }
 187
 188                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:updated/text()');
 189
 190                         $author["app"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:generator/text()');
 191
 192                         $entries = $xpath->query('/atom:feed/atom:entry');
 193                 }
 194
 195                 // Is it RSS?
 196                 if ($xpath->query('/rss/channel')->length > 0) {
 197                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rss/channel/link/text()');
 198
 199                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/title/text()');
 200                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/rss/channel/image/url/text()');
 201
 202                         if (empty($author["author-name"])) {
 203                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/copyright/text()');
 204                         }
 205
 206                         if (empty($author["author-name"])) {
 207                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/description/text()');
 208                         }
 209
 210                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/rss/channel/pubDate/text()');
 211
 212                         $author["app"] = XML::getFirstNodeValue($xpath, '/rss/channel/generator/text()');
 213
 214                         $entries = $xpath->query('/rss/channel/item');
 215                 }
 216
 217                 if (!$dryRun) {
 218                         $author["author-link"] = $contact["url"];
 219
 220                         if (empty($author["author-name"])) {
 221                                 $author["author-name"] = $contact["name"];
 222                         }
 223
 224                         $author["author-avatar"] = $contact["thumb"];
 225
 226                         $author["owner-link"] = $contact["url"];
 227                         $author["owner-name"] = $contact["name"];
 228                         $author["owner-avatar"] = $contact["thumb"];
 229                 }
 230
 231                 $header = [];
 232                 $header["uid"] = $importer["uid"] ?? 0;
 233                 $header["network"] = Protocol::FEED;
 234                 $header["wall"] = 0;
 235                 $header["origin"] = 0;
 236                 $header["gravity"] = GRAVITY_PARENT;
 237                 $header["private"] = Item::PUBLIC;
 238                 $header["verb"] = Activity::POST;
 239                 $header["object-type"] = Activity\ObjectType::NOTE;
 240                 $header["post-type"] = Item::PT_ARTICLE;
 241
 242                 $header["contact-id"] = $contact["id"] ?? 0;
 243
 244                 if (!is_object($entries)) {
 245                         Logger::info("There are no entries in this feed.");
 246                         return [];
 247                 }
 248
 249                 $items = [];
 250                 $creation_dates = [];
 251
 252                 // Limit the number of items that are about to be fetched
 253                 $total_items = ($entries->length - 1);
 254                 $max_items = DI::config()->get('system', 'max_feed_items');
 255                 if (($max_items > 0) && ($total_items > $max_items)) {
 256                         $total_items = $max_items;
 257                 }
 258
 259                 $postings = [];
 260
 261                 // Importing older entries first
 262                 for ($i = $total_items; $i >= 0; --$i) {
 263                         $entry = $entries->item($i);
 264
 265                         $item = array_merge($header, $author);
 266
 267                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']", $entry);
 268                         if (!is_object($alternate)) {
 269                                 $alternate = XML::getFirstAttributes($xpath, "atom:link", $entry);
 270                         }
 271                         if (is_object($alternate)) {
 272                                 foreach ($alternate as $attribute) {
 273                                         if ($attribute->name == "href") {
 274                                                 $item["plink"] = $attribute->textContent;
 275                                         }
 276                                 }
 277                         }
 278
 279                         if (empty($item["plink"])) {
 280                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'link/text()', $entry);
 281                         }
 282
 283                         if (empty($item["plink"])) {
 284                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'rss:link/text()', $entry);
 285                         }
 286
 287                         $item["uri"] = XML::getFirstNodeValue($xpath, 'atom:id/text()', $entry);
 288
 289                         if (empty($item["uri"])) {
 290                                 $item["uri"] = XML::getFirstNodeValue($xpath, 'guid/text()', $entry);
 291                         }
 292
 293                         if (empty($item["uri"])) {
 294                                 $item["uri"] = $item["plink"];
 295                         }
 296
 297                         // Add the base path if missing
 298                         $item["uri"] = Network::addBasePath($item["uri"], $basepath);
 299                         $item["plink"] = Network::addBasePath($item["plink"], $basepath);
 300
 301                         $orig_plink = $item["plink"];
 302
 303                         try {
 304                                 $item["plink"] = DI::httpClient()->finalUrl($item["plink"]);
 305                         } catch (TransferException $exception) {
 306                                 Logger::notice('Item URL couldn\'t get expanded', ['url' => $item["plink"], 'exception' => $exception]);
 307                         }
 308
 309                         $item["title"] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
 310
 311                         if (empty($item["title"])) {
 312                                 $item["title"] = XML::getFirstNodeValue($xpath, 'title/text()', $entry);
 313                         }
 314                         if (empty($item["title"])) {
 315                                 $item["title"] = XML::getFirstNodeValue($xpath, 'rss:title/text()', $entry);
 316                         }
 317
 318                         $item["title"] = html_entity_decode($item["title"], ENT_QUOTES, 'UTF-8');
 319
 320                         $published = XML::getFirstNodeValue($xpath, 'atom:published/text()', $entry);
 321
 322                         if (empty($published)) {
 323                                 $published = XML::getFirstNodeValue($xpath, 'pubDate/text()', $entry);
 324                         }
 325
 326                         if (empty($published)) {
 327                                 $published = XML::getFirstNodeValue($xpath, 'dc:date/text()', $entry);
 328                         }
 329
 330                         $updated = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $entry);
 331
 332                         if (empty($updated) && !empty($published)) {
 333                                 $updated = $published;
 334                         }
 335
 336                         if (empty($published) && !empty($updated)) {
 337                                 $published = $updated;
 338                         }
 339
 340                         if ($published != "") {
 341                                 $item["created"] = $published;
 342                         }
 343
 344                         if ($updated != "") {
 345                                 $item["edited"] = $updated;
 346                         }
 347
 348                         if (!$dryRun) {
 349                                 $condition = ["`uid` = ? AND `uri` = ? AND `network` IN (?, ?)",
 350                                         $importer["uid"], $item["uri"], Protocol::FEED, Protocol::DFRN];
 351                                 $previous = Post::selectFirst(['id', 'created'], $condition);
 352                                 if (DBA::isResult($previous)) {
 353                                         // Use the creation date when the post had been stored. It can happen this date changes in the feed.
 354                                         $creation_dates[] = $previous['created'];
 355                                         Logger::info("Item with uri " . $item["uri"] . " for user " . $importer["uid"] . " already existed under id " . $previous["id"]);
 356                                         continue;
 357                                 }
 358                                 $creation_dates[] = DateTimeFormat::utc($item['created']);
 359                         }
 360
 361                         $creator = XML::getFirstNodeValue($xpath, 'author/text()', $entry);
 362
 363                         if (empty($creator)) {
 364                                 $creator = XML::getFirstNodeValue($xpath, 'atom:author/atom:name/text()', $entry);
 365                         }
 366
 367                         if (empty($creator)) {
 368                                 $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 369                         }
 370
 371                         if ($creator != "") {
 372                                 $item["author-name"] = $creator;
 373                         }
 374
 375                         $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 376
 377                         if ($creator != "") {
 378                                 $item["author-name"] = $creator;
 379                         }
 380
 381                         /// @TODO ?
 382                         // <category>Ausland</category>
 383                         // <media:thumbnail width="152" height="76" url="http://www.taz.de/picture/667875/192/14388767.jpg"/>
 384
 385                         $attachments = [];
 386
 387                         $enclosures = $xpath->query("enclosure|atom:link[@rel='enclosure']", $entry);
 388                         foreach ($enclosures as $enclosure) {
 389                                 $href = "";
 390                                 $length = null;
 391                                 $type = null;
 392
 393                                 foreach ($enclosure->attributes as $attribute) {
 394                                         if (in_array($attribute->name, ["url", "href"])) {
 395                                                 $href = $attribute->textContent;
 396                                         } elseif ($attribute->name == "length") {
 397                                                 $length = (int)$attribute->textContent;
 398                                         } elseif ($attribute->name == "type") {
 399                                                 $type = $attribute->textContent;
 400                                         }
 401                                 }
 402
 403                                 if (!empty($href)) {
 404                                         $attachment = ['type' => Post\Media::UNKNOWN, 'url' => $href, 'mimetype' => $type, 'size' => $length];
 405
 406                                         $attachment = Post\Media::fetchAdditionalData($attachment);
 407
 408                                         // By now we separate the visible media types (audio, video, image) from the rest
 409                                         // In the future we should try to avoid the DOCUMENT type and only use the real one - but not in the RC phase.
 410                                         if (!in_array($attachment['type'], [Post\Media::AUDIO, Post\Media::IMAGE, Post\Media::VIDEO])) {
 411                                                 $attachment['type'] = Post\Media::DOCUMENT;
 412                                         }
 413                                         $attachments[] = $attachment;
 414                                 }
 415                         }
 416
 417                         $taglist = [];
 418                         $categories = $xpath->query("category", $entry);
 419                         foreach ($categories as $category) {
 420                                 $taglist[] = $category->nodeValue;
 421                         }
 422
 423                         $body = trim(XML::getFirstNodeValue($xpath, 'atom:content/text()', $entry));
 424
 425                         if (empty($body)) {
 426                                 $body = trim(XML::getFirstNodeValue($xpath, 'content:encoded/text()', $entry));
 427                         }
 428
 429                         $summary = trim(XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry));
 430
 431                         if (empty($summary)) {
 432                                 $summary = trim(XML::getFirstNodeValue($xpath, 'description/text()', $entry));
 433                         }
 434
 435                         if (empty($body)) {
 436                                 $body = $summary;
 437                                 $summary = '';
 438                         }
 439
 440                         if ($body == $summary) {
 441                                 $summary = '';
 442                         }
 443
 444                         // remove the content of the title if it is identically to the body
 445                         // This helps with auto generated titles e.g. from tumblr
 446                         if (self::titleIsBody($item["title"], $body)) {
 447                                 $item["title"] = "";
 448                         }
 449                         $item["body"] = HTML::toBBCode($body, $basepath);
 450
 451                         // Remove tracking pixels
 452                         $item["body"] = preg_replace("/\[img=1x1\]([^\[\]]*)\[\/img\]/Usi", '', $item["body"]);
 453
 454                         if (($item["body"] == '') && ($item["title"] != '')) {
 455                                 $item["body"] = $item["title"];
 456                                 $item["title"] = '';
 457                         }
 458
 459                         if ($dryRun) {
 460                                 $items[] = $item;
 461                                 break;
 462                         } elseif (!Item::isValid($item)) {
 463                                 Logger::info('Feed item is invalid', ['created' => $item['created'], 'uid' => $item['uid'], 'uri' => $item['uri']]);
 464                                 continue;
 465                         } elseif (Item::isTooOld($item)) {
 466                                 Logger::info('Feed is too old', ['created' => $item['created'], 'uid' => $item['uid'], 'uri' => $item['uri']]);
 467                                 continue;
 468                         }
 469
 470                         $preview = '';
 471                         if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] < 3)) {
 472                                 // Handle enclosures and treat them as preview picture
 473                                 foreach ($attachments as $attachment) {
 474                                         if ($attachment["mimetype"] == "image/jpeg") {
 475                                                 $preview = $attachment["url"];
 476                                         }
 477                                 }
 478
 479                                 // Remove a possible link to the item itself
 480                                 $item["body"] = str_replace($item["plink"], '', $item["body"]);
 481                                 $item["body"] = trim(preg_replace('/\[url\=\](\w+.*?)\[\/url\]/i', '', $item["body"]));
 482
 483                                 // Replace the content when the title is longer than the body
 484                                 $replace = (strlen($item["title"]) > strlen($item["body"]));
 485
 486                                 // Replace it, when there is an image in the body
 487                                 if (strstr($item["body"], '[/img]')) {
 488                                         $replace = true;
 489                                 }
 490
 491                                 // Replace it, when there is a link in the body
 492                                 if (strstr($item["body"], '[/url]')) {
 493                                         $replace = true;
 494                                 }
 495
 496                                 $saved_body = $item["body"];
 497                                 $saved_title = $item["title"];
 498
 499                                 if ($replace) {
 500                                         $item["body"] = trim($item["title"]);
 501                                 }
 502
 503                                 $data = ParseUrl::getSiteinfoCached($item['plink']);
 504                                 if (!empty($data['text']) && !empty($data['title']) && (mb_strlen($item['body']) < mb_strlen($data['text']))) {
 505                                         // When the fetched page info text is longer than the body, we do try to enhance the body
 506                                         if (!empty($item['body']) && (strpos($data['title'], $item['body']) === false) && (strpos($data['text'], $item['body']) === false)) {
 507                                                 // The body is not part of the fetched page info title or page info text. So we add the text to the body
 508                                                 $item['body'] .= "\n\n" . $data['text'];
 509                                         } else {
 510                                                 // Else we replace the body with the page info text
 511                                                 $item['body'] = $data['text'];
 512                                         }
 513                                 }
 514
 515                                 $data = PageInfo::queryUrl($item["plink"], false, $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_denylist"] ?? '');
 516
 517                                 if (!empty($data)) {
 518                                         // Take the data that was provided by the feed if the query is empty
 519                                         if (($data['type'] == 'link') && empty($data['title']) && empty($data['text'])) {
 520                                                 $data['title'] = $saved_title;
 521                                                 $item["body"] = $saved_body;
 522                                         }
 523
 524                                         $data_text = strip_tags(trim($data['text'] ?? ''));
 525                                         $item_body = strip_tags(trim($item['body'] ?? ''));
 526
 527                                         if (!empty($data_text) && (($data_text == $item_body) || strstr($item_body, $data_text))) {
 528                                                 $data['text'] = '';
 529                                         }
 530
 531                                         // We always strip the title since it will be added in the page information
 532                                         $item["title"] = "";
 533                                         $item["body"] = $item["body"] . "\n" . PageInfo::getFooterFromData($data, false);
 534                                         $taglist = $contact["fetch_further_information"] == 2 ? PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"] ?? '') : [];
 535                                         $item["object-type"] = Activity\ObjectType::BOOKMARK;
 536                                         $attachments = [];
 537
 538                                         foreach (['audio', 'video'] as $elementname) {
 539                                                 if (!empty($data[$elementname])) {
 540                                                         foreach ($data[$elementname] as $element) {
 541                                                                 if (!empty($element['src'])) {
 542                                                                         $src = $element['src'];
 543                                                                 } elseif (!empty($element['content'])) {
 544                                                                         $src = $element['content'];
 545                                                                 } else {
 546                                                                         continue;
 547                                                                 }
 548
 549                                                                 $attachments[] = [
 550                                                                         'type'        => ($elementname == 'audio') ? Post\Media::AUDIO : Post\Media::VIDEO,
 551                                                                         'url'         => $src,
 552                                                                         'preview'     => $element['image']       ?? null,
 553                                                                         'mimetype'    => $element['contenttype'] ?? null,
 554                                                                         'name'        => $element['name']        ?? null,
 555                                                                         'description' => $element['description'] ?? null,
 556                                                                 ];
 557                                                         }
 558                                                 }
 559                                         }
 560                                 }
 561                         } else {
 562                                 if (!empty($summary)) {
 563                                         $item["body"] = '[abstract]' . HTML::toBBCode($summary, $basepath) . "[/abstract]\n" . $item["body"];
 564                                 }
 565
 566                                 if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] == 3)) {
 567                                         if (empty($taglist)) {
 568                                                 $taglist = PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"] ?? '');
 569                                         }
 570                                         $item["body"] .= "\n" . self::tagToString($taglist);
 571                                 } else {
 572                                         $taglist = [];
 573                                 }
 574
 575                                 // Add the link to the original feed entry if not present in feed
 576                                 if (($item['plink'] != '') && !strstr($item["body"], $item['plink']) && !in_array($item['plink'], array_column($attachments, 'url'))) {
 577                                         $item["body"] .= "[hr][url]" . $item['plink'] . "[/url]";
 578                                 }
 579                         }
 580
 581                         if (empty($item['title'])) {
 582                                 $item['post-type'] = Item::PT_NOTE;
 583                         }
 584
 585                         Logger::info('Stored feed', ['item' => $item]);
 586
 587                         $notify = Item::isRemoteSelf($contact, $item);
 588
 589                         // Distributed items should have a well formatted URI.
 590                         // Additionally we have to avoid conflicts with identical URI between imported feeds and these items.
 591                         if ($notify) {
 592                                 $item['guid'] = Item::guidFromUri($orig_plink, DI::baseUrl()->getHostname());
 593                                 $item['uri'] = Item::newURI($item['uid'], $item['guid']);
 594                                 unset($item['thr-parent']);
 595                                 unset($item['parent-uri']);
 596
 597                                 // Set the delivery priority for "remote self" to "medium"
 598                                 $notify = PRIORITY_MEDIUM;
 599                         }
 600
 601                         $condition = ['uid' => $item['uid'], 'uri' => $item['uri']];
 602                         if (!Post::exists($condition) && !Post\Delayed::exists($item["uri"], $item['uid'])) {
 603                                 if (!$notify) {
 604                                         Post\Delayed::publish($item, $notify, $taglist, $attachments);
 605                                 } else {
 606                                         $postings[] = ['item' => $item, 'notify' => $notify,
 607                                                 'taglist' => $taglist, 'attachments' => $attachments];
 608                                 }
 609                         } else {
 610                                 Logger::info('Post already created or exists in the delayed posts queue', ['uid' => $item['uid'], 'uri' => $item["uri"]]);
 611                         }
 612                 }
 613
 614                 if (!empty($postings)) {
 615                         $min_posting = DI::config()->get('system', 'minimum_posting_interval', 0);
 616                         $total = count($postings);
 617                         if ($total > 1) {
 618                                 // Posts shouldn't be delayed more than a day
 619                                 $interval = min(1440, self::getPollInterval($contact));
 620                                 $delay = max(round(($interval * 60) / $total), 60 * $min_posting);
 621                                 Logger::info('Got posting delay', ['delay' => $delay, 'interval' => $interval, 'items' => $total, 'cid' => $contact['id'], 'url' => $contact['url']]);
 622                         } else {
 623                                 $delay = 0;
 624                         }
 625
 626                         $post_delay = 0;
 627
 628                         foreach ($postings as $posting) {
 629                                 if ($delay > 0) {
 630                                         $publish_time = time() + $post_delay;
 631                                         $post_delay += $delay;
 632                                 } else {
 633                                         $publish_time = time();
 634                                 }
 635
 636                                 $last_publish = DI::pConfig()->get($posting['item']['uid'], 'system', 'last_publish', 0, true);
 637                                 $next_publish = max($last_publish + (60 * $min_posting), time());
 638                                 if ($publish_time < $next_publish) {
 639                                         $publish_time = $next_publish;
 640                                 }
 641                                 $publish_at = date(DateTimeFormat::MYSQL, $publish_time);
 642
 643                                 if (Post\Delayed::add($posting['item']['uri'], $posting['item'], $posting['notify'], Post\Delayed::PREPARED, $publish_at, $posting['taglist'], $posting['attachments'])) {
 644                                         DI::pConfig()->set($item['uid'], 'system', 'last_publish', $publish_time);
 645                                 }
 646                         }
 647                 }
 648
 649                 if (!$dryRun && DI::config()->get('system', 'adjust_poll_frequency')) {
 650                         self::adjustPollFrequency($contact, $creation_dates);
 651                 }
 652
 653                 return ["header" => $author, "items" => $items];
 654         }
 655
 656         /**
 657          * Automatically adjust the poll frequency according to the post frequency
 658          *
 659          * @param array $contact
 660          * @param array $creation_dates
 661          * @return void
 662          */
 663         private static function adjustPollFrequency(array $contact, array $creation_dates)
 664         {
 665                 if ($contact['network'] != Protocol::FEED) {
 666                         Logger::info('Contact is no feed, skip.', ['id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url'], 'network' => $contact['network']]);
 667                         return;
 668                 }
 669
 670                 if (!empty($creation_dates)) {
 671                         // Count the post frequency and the earliest and latest post date
 672                         $frequency = [];
 673                         $oldest = time();
 674                         $newest = 0;
 675                         $oldest_date = $newest_date = '';
 676
 677                         foreach ($creation_dates as $date) {
 678                                 $timestamp = strtotime($date);
 679                                 $day = intdiv($timestamp, 86400);
 680                                 $hour = $timestamp % 86400;
 681
 682                                 // Only have a look at values from the last seven days
 683                                 if (((time() / 86400) - $day) < 7) {
 684                                         if (empty($frequency[$day])) {
 685                                                 $frequency[$day] = ['count' => 1, 'low' => $hour, 'high' => $hour];
 686                                         } else {
 687                                                 ++$frequency[$day]['count'];
 688                                                 if ($frequency[$day]['low'] > $hour) {
 689                                                         $frequency[$day]['low'] = $hour;
 690                                                 }
 691                                                 if ($frequency[$day]['high'] < $hour) {
 692                                                         $frequency[$day]['high'] = $hour;
 693                                                 }
 694                                         }
 695                                 }
 696                                 if ($oldest > $day) {
 697                                         $oldest = $day;
 698                                         $oldest_date = $date;
 699                                 }
 700
 701                                 if ($newest < $day) {
 702                                         $newest = $day;
 703                                         $newest_date = $date;
 704                                 }
 705                         }
 706
 707                         if (count($creation_dates) == 1) {
 708                                 Logger::info('Feed had posted a single time, switching to daily polling', ['newest' => $newest_date, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 709                                 $priority = 8; // Poll once a day
 710                         }
 711
 712                         if (empty($priority) && (((time() / 86400) - $newest) > 730)) {
 713                                 Logger::info('Feed had not posted for two years, switching to monthly polling', ['newest' => $newest_date, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 714                                 $priority = 10; // Poll every month
 715                         }
 716
 717                         if (empty($priority) && (((time() / 86400) - $newest) > 365)) {
 718                                 Logger::info('Feed had not posted for a year, switching to weekly polling', ['newest' => $newest_date, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 719                                 $priority = 9; // Poll every week
 720                         }
 721
 722                         if (empty($priority) && empty($frequency)) {
 723                                 Logger::info('Feed had not posted for at least a week, switching to daily polling', ['newest' => $newest_date, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 724                                 $priority = 8; // Poll once a day
 725                         }
 726
 727                         if (empty($priority)) {
 728                                 // Calculate the highest "posts per day" value
 729                                 $max = 0;
 730                                 foreach ($frequency as $entry) {
 731                                         if (($entry['count'] == 1) || ($entry['high'] == $entry['low'])) {
 732                                                 continue;
 733                                         }
 734
 735                                         // We take the earliest and latest post day and interpolate the number of post per day
 736                                         // that would had been created with this post frequency
 737
 738                                         // Assume at least four hours between oldest and newest post per day - should be okay for news outlets
 739                                         $duration = max($entry['high'] - $entry['low'], 14400);
 740                                         $ppd = (86400 / $duration) * $entry['count'];
 741                                         if ($ppd > $max) {
 742                                                 $max = $ppd;
 743                                         }
 744                                 }
 745                                 if ($max > 48) {
 746                                         $priority = 1; // Poll every quarter hour
 747                                 } elseif ($max > 24) {
 748                                         $priority = 2; // Poll half an hour
 749                                 } elseif ($max > 12) {
 750                                         $priority = 3; // Poll hourly
 751                                 } elseif ($max > 8) {
 752                                         $priority = 4; // Poll every two hours
 753                                 } elseif ($max > 4) {
 754                                         $priority = 5; // Poll every three hours
 755                                 } elseif ($max > 2) {
 756                                         $priority = 6; // Poll every six hours
 757                                 } else {
 758                                         $priority = 7; // Poll twice a day
 759                                 }
 760                                 Logger::info('Calculated priority by the posts per day', ['priority' => $priority, 'max' => round($max, 2), 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 761                         }
 762                 } else {
 763                         Logger::info('No posts, switching to daily polling', ['id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 764                         $priority = 8; // Poll once a day
 765                 }
 766
 767                 if ($contact['rating'] != $priority) {
 768                         Logger::notice('Adjusting priority', ['old' => $contact['rating'], 'new' => $priority, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 769                         Contact::update(['rating' => $priority], ['id' => $contact['id']]);
 770                 }
 771         }
 772
 773         /**
 774          * Get the poll interval for the given contact array
 775          *
 776          * @param array $contact
 777          * @return int Poll interval in minutes
 778          */
 779         public static function getPollInterval(array $contact)
 780         {
 781                 if (in_array($contact['network'], [Protocol::MAIL, Protocol::FEED])) {
 782                         $ratings = [0, 3, 7, 8, 9, 10];
 783                         if (DI::config()->get('system', 'adjust_poll_frequency') && ($contact['network'] == Protocol::FEED)) {
 784                                 $rating = $contact['rating'];
 785                         } elseif (array_key_exists($contact['priority'], $ratings)) {
 786                                 $rating = $ratings[$contact['priority']];
 787                         } else {
 788                                 $rating = -1;
 789                         }
 790                 } else {
 791                         // Check once a week per default for all other networks
 792                         $rating = 9;
 793                 }
 794
 795                 // Friendica and OStatus are checked once a day
 796                 if (in_array($contact['network'], [Protocol::DFRN, Protocol::OSTATUS])) {
 797                         $rating = 8;
 798                 }
 799
 800                 // Check archived contacts or contacts with unsupported protocols once a month
 801                 if ($contact['archive'] || in_array($contact['network'], [Protocol::ZOT, Protocol::PHANTOM])) {
 802                         $rating = 10;
 803                 }
 804
 805                 if ($rating < 0) {
 806                         return 0;
 807                 }
 808                 /*
 809                  * Based on $contact['priority'], should we poll this site now? Or later?
 810                  */
 811
 812                 $min_poll_interval = max(1, DI::config()->get('system', 'min_poll_interval'));
 813
 814                 $poll_intervals = [$min_poll_interval, 15, 30, 60, 120, 180, 360, 720 ,1440, 10080, 43200];
 815
 816                 //$poll_intervals = [$min_poll_interval . ' minute', '15 minute', '30 minute',
 817                 //      '1 hour', '2 hour', '3 hour', '6 hour', '12 hour' ,'1 day', '1 week', '1 month'];
 818
 819                 return $poll_intervals[$rating];
 820         }
 821
 822         /**
 823          * Convert a tag array to a tag string
 824          *
 825          * @param array $tags
 826          * @return string tag string
 827          */
 828         private static function tagToString(array $tags)
 829         {
 830                 $tagstr = '';
 831
 832                 foreach ($tags as $tag) {
 833                         if ($tagstr != "") {
 834                                 $tagstr .= ", ";
 835                         }
 836
 837                         $tagstr .= "#[url=" . DI::baseUrl() . "/search?tag=" . urlencode($tag) . "]" . $tag . "[/url]";
 838                 }
 839
 840                 return $tagstr;
 841         }
 842
 843         private static function titleIsBody($title, $body)
 844         {
 845                 $title = strip_tags($title);
 846                 $title = trim($title);
 847                 $title = html_entity_decode($title, ENT_QUOTES, 'UTF-8');
 848                 $title = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $title);
 849
 850                 $body = strip_tags($body);
 851                 $body = trim($body);
 852                 $body = html_entity_decode($body, ENT_QUOTES, 'UTF-8');
 853                 $body = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $body);
 854
 855                 if (strlen($title) < strlen($body)) {
 856                         $body = substr($body, 0, strlen($title));
 857                 }
 858
 859                 if (($title != $body) && (substr($title, -3) == "...")) {
 860                         $pos = strrpos($title, "...");
 861                         if ($pos > 0) {
 862                                 $title = substr($title, 0, $pos);
 863                                 $body = substr($body, 0, $pos);
 864                         }
 865                 }
 866                 return ($title == $body);
 867         }
 868
 869         /**
 870          * Creates the Atom feed for a given nickname
 871          *
 872          * Supported filters:
 873          * - activity (default): all the public posts
 874          * - posts: all the public top-level posts
 875          * - comments: all the public replies
 876          *
 877          * Updates the provided last_update parameter if the result comes from the
 878          * cache or it is empty
 879          *
 880          * @param string  $owner_nick  Nickname of the feed owner
 881          * @param string  $last_update Date of the last update
 882          * @param integer $max_items   Number of maximum items to fetch
 883          * @param string  $filter      Feed items filter (activity, posts or comments)
 884          * @param boolean $nocache     Wether to bypass caching
 885          *
 886          * @return string Atom feed
 887          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 888          * @throws \ImagickException
 889          */
 890         public static function atom($owner_nick, $last_update, $max_items = 300, $filter = 'activity', $nocache = false)
 891         {
 892                 $stamp = microtime(true);
 893
 894                 $owner = User::getOwnerDataByNick($owner_nick);
 895                 if (!$owner) {
 896                         return;
 897                 }
 898
 899                 $cachekey = "feed:feed:" . $owner_nick . ":" . $filter . ":" . $last_update;
 900
 901                 $previous_created = $last_update;
 902
 903                 // Don't cache when the last item was posted less then 15 minutes ago (Cache duration)
 904                 if ((time() - strtotime($owner['last-item'])) < 15*60) {
 905                         $result = DI::cache()->get($cachekey);
 906                         if (!$nocache && !is_null($result)) {
 907                                 Logger::info('Cached feed duration', ['seconds' => number_format(microtime(true) - $stamp, 3), 'nick' => $owner_nick, 'filter' => $filter, 'created' => $previous_created]);
 908                                 return $result['feed'];
 909                         }
 910                 }
 911
 912                 $check_date = empty($last_update) ? '' : DateTimeFormat::utc($last_update);
 913                 $authorid = Contact::getIdForURL($owner["url"]);
 914
 915                 $condition = ["`uid` = ? AND `received` > ? AND NOT `deleted` AND `gravity` IN (?, ?)
 916                         AND `private` != ? AND `visible` AND `wall` AND `parent-network` IN (?, ?, ?, ?)",
 917                         $owner["uid"], $check_date, GRAVITY_PARENT, GRAVITY_COMMENT,
 918                         Item::PRIVATE, Protocol::ACTIVITYPUB,
 919                         Protocol::OSTATUS, Protocol::DFRN, Protocol::DIASPORA];
 920
 921                 if ($filter === 'comments') {
 922                         $condition[0] .= " AND `gravity` = ? ";
 923                         $condition[] = GRAVITY_COMMENT;
 924                 }
 925
 926                 if ($owner['account-type'] != User::ACCOUNT_TYPE_COMMUNITY) {
 927                         $condition[0] .= " AND `contact-id` = ? AND `author-id` = ?";
 928                         $condition[] = $owner["id"];
 929                         $condition[] = $authorid;
 930                 }
 931
 932                 $params = ['order' => ['received' => true], 'limit' => $max_items];
 933
 934                 if ($filter === 'posts') {
 935                         $ret = Post::selectThread(Item::DELIVER_FIELDLIST, $condition, $params);
 936                 } else {
 937                         $ret = Post::select(Item::DELIVER_FIELDLIST, $condition, $params);
 938                 }
 939
 940                 $items = Post::toArray($ret);
 941
 942                 $doc = new DOMDocument('1.0', 'utf-8');
 943                 $doc->formatOutput = true;
 944
 945                 $root = self::addHeader($doc, $owner, $filter);
 946
 947                 foreach ($items as $item) {
 948                         $entry = self::noteEntry($doc, $item, $owner);
 949                         $root->appendChild($entry);
 950
 951                         if ($last_update < $item['created']) {
 952                                 $last_update = $item['created'];
 953                         }
 954                 }
 955
 956                 $feeddata = trim($doc->saveXML());
 957
 958                 $msg = ['feed' => $feeddata, 'last_update' => $last_update];
 959                 DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
 960
 961                 Logger::info('Feed duration', ['seconds' => number_format(microtime(true) - $stamp, 3), 'nick' => $owner_nick, 'filter' => $filter, 'created' => $previous_created]);
 962
 963                 return $feeddata;
 964         }
 965
 966         /**
 967          * Adds the header elements to the XML document
 968          *
 969          * @param DOMDocument $doc       XML document
 970          * @param array       $owner     Contact data of the poster
 971          * @param string      $filter    The related feed filter (activity, posts or comments)
 972          *
 973          * @return object header root element
 974          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 975          */
 976         private static function addHeader(DOMDocument $doc, array $owner, $filter)
 977         {
 978                 $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 979                 $doc->appendChild($root);
 980
 981                 $title = '';
 982                 $selfUri = '/feed/' . $owner["nick"] . '/';
 983                 switch ($filter) {
 984                         case 'activity':
 985                                 $title = DI::l10n()->t('%s\'s timeline', $owner['name']);
 986                                 $selfUri .= $filter;
 987                                 break;
 988                         case 'posts':
 989                                 $title = DI::l10n()->t('%s\'s posts', $owner['name']);
 990                                 break;
 991                         case 'comments':
 992                                 $title = DI::l10n()->t('%s\'s comments', $owner['name']);
 993                                 $selfUri .= $filter;
 994                                 break;
 995                 }
 996
 997                 $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION . "-" . DB_UPDATE_VERSION];
 998                 XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
 999                 XML::addElement($doc, $root, "id", DI::baseUrl() . "/profile/" . $owner["nick"]);
1000                 XML::addElement($doc, $root, "title", $title);
1001                 XML::addElement($doc, $root, "subtitle", sprintf("Updates from %s on %s", $owner["name"], DI::config()->get('config', 'sitename')));
1002                 XML::addElement($doc, $root, "logo", User::getAvatarUrl($owner, Proxy::SIZE_SMALL));
1003                 XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
1004
1005                 $author = self::addAuthor($doc, $owner);
1006                 $root->appendChild($author);
1007
1008                 $attributes = ["href" => $owner["url"], "rel" => "alternate", "type" => "text/html"];
1009                 XML::addElement($doc, $root, "link", "", $attributes);
1010
1011                 OStatus::hublinks($doc, $root, $owner["nick"]);
1012
1013                 $attributes = ["href" => DI::baseUrl() . $selfUri, "rel" => "self", "type" => "application/atom+xml"];
1014                 XML::addElement($doc, $root, "link", "", $attributes);
1015
1016                 return $root;
1017         }
1018
1019         /**
1020          * Adds the author element to the XML document
1021          *
1022          * @param DOMDocument $doc          XML document
1023          * @param array       $owner        Contact data of the poster
1024          *
1025          * @return \DOMElement author element
1026          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1027          */
1028         private static function addAuthor(DOMDocument $doc, array $owner)
1029         {
1030                 $author = $doc->createElement("author");
1031                 XML::addElement($doc, $author, "uri", $owner["url"]);
1032                 XML::addElement($doc, $author, "name", $owner["nick"]);
1033                 XML::addElement($doc, $author, "email", $owner["addr"]);
1034
1035                 return $author;
1036         }
1037
1038         /**
1039          * Adds a regular entry element
1040          *
1041          * @param DOMDocument $doc       XML document
1042          * @param array       $item      Data of the item that is to be posted
1043          * @param array       $owner     Contact data of the poster
1044          * @param bool        $toplevel  Is it for en entry element (false) or a feed entry (true)?
1045          *
1046          * @return \DOMElement Entry element
1047          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1048          * @throws \ImagickException
1049          */
1050         private static function noteEntry(DOMDocument $doc, array $item, array $owner)
1051         {
1052                 if (($item['gravity'] != GRAVITY_PARENT) && (Strings::normaliseLink($item["author-link"]) != Strings::normaliseLink($owner["url"]))) {
1053                         Logger::info('Feed entry author does not match feed owner', ['owner' => $owner["url"], 'author' => $item["author-link"]]);
1054                 }
1055
1056                 $entry = OStatus::entryHeader($doc, $owner, $item, false);
1057
1058                 self::entryContent($doc, $entry, $item, self::getTitle($item), '', true);
1059
1060                 self::entryFooter($doc, $entry, $item, $owner);
1061
1062                 return $entry;
1063         }
1064
1065         /**
1066          * Adds elements to the XML document
1067          *
1068          * @param DOMDocument $doc       XML document
1069          * @param \DOMElement $entry     Entry element where the content is added
1070          * @param array       $item      Data of the item that is to be posted
1071          * @param array       $owner     Contact data of the poster
1072          * @param string      $title     Title for the post
1073          * @param string      $verb      The activity verb
1074          * @param bool        $complete  Add the "status_net" element?
1075          * @param bool        $feed_mode Behave like a regular feed for users if true
1076          * @return void
1077          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1078          */
1079         private static function entryContent(DOMDocument $doc, \DOMElement $entry, array $item, $title, $verb = "", $complete = true)
1080         {
1081                 if ($verb == "") {
1082                         $verb = OStatus::constructVerb($item);
1083                 }
1084
1085                 XML::addElement($doc, $entry, "id", $item["uri"]);
1086                 XML::addElement($doc, $entry, "title", html_entity_decode($title, ENT_QUOTES, 'UTF-8'));
1087
1088                 $body = OStatus::formatPicturePost($item['body'], $item['uri-id']);
1089
1090                 $body = BBCode::convertForUriId($item['uri-id'], $body, BBCode::ACTIVITYPUB);
1091
1092                 XML::addElement($doc, $entry, "content", $body, ["type" => "html"]);
1093
1094                 XML::addElement($doc, $entry, "link", "", ["rel" => "alternate", "type" => "text/html",
1095                                                                 "href" => DI::baseUrl()."/display/".$item["guid"]]
1096                 );
1097
1098                 XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM));
1099                 XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM));
1100         }
1101
1102         /**
1103          * Adds the elements at the foot of an entry to the XML document
1104          *
1105          * @param DOMDocument $doc       XML document
1106          * @param object      $entry     The entry element where the elements are added
1107          * @param array       $item      Data of the item that is to be posted
1108          * @param array       $owner     Contact data of the poster
1109          * @param bool        $complete  default true
1110          * @return void
1111          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1112          */
1113         private static function entryFooter(DOMDocument $doc, $entry, array $item, array $owner)
1114         {
1115                 $mentioned = [];
1116
1117                 if ($item['gravity'] != GRAVITY_PARENT) {
1118                         $parent = Post::selectFirst(['guid', 'author-link', 'owner-link'], ['id' => $item['parent']]);
1119
1120                         $thrparent = Post::selectFirst(['guid', 'author-link', 'owner-link', 'plink'], ['uid' => $owner['uid'], 'uri' => $item['thr-parent']]);
1121
1122                         if (DBA::isResult($thrparent)) {
1123                                 $mentioned[$thrparent['author-link']] = $thrparent['author-link'];
1124                                 $mentioned[$thrparent['owner-link']]  = $thrparent['owner-link'];
1125                                 $parent_plink                         = $thrparent['plink'];
1126                         } elseif (DBA::isResult($parent)) {
1127                                 $mentioned[$parent['author-link']] = $parent['author-link'];
1128                                 $mentioned[$parent['owner-link']]  = $parent['owner-link'];
1129                                 $parent_plink                      = DI::baseUrl() . '/display/' . $parent['guid'];
1130                         } else {
1131                                 DI::logger()->notice('Missing parent and thr-parent for child item', ['item' => $item]);
1132                         }
1133
1134                         if (isset($parent_plink)) {
1135                                 $attributes = [
1136                                         'ref'  => $item['thr-parent'],
1137                                         'href' => $parent_plink];
1138                                 XML::addElement($doc, $entry, 'thr:in-reply-to', '', $attributes);
1139
1140                                 $attributes = [
1141                                         'rel'  => 'related',
1142                                         'href' => $parent_plink];
1143                                 XML::addElement($doc, $entry, 'link', '', $attributes);
1144                         }
1145                 }
1146
1147                 // uri-id isn't present for follow entry pseudo-items
1148                 $tags = Tag::getByURIId($item['uri-id'] ?? 0);
1149                 foreach ($tags as $tag) {
1150                         $mentioned[$tag['url']] = $tag['url'];
1151                 }
1152
1153                 foreach ($tags as $tag) {
1154                         if ($tag['type'] == Tag::HASHTAG) {
1155                                 XML::addElement($doc, $entry, 'category', '', ['term' => $tag['name']]);
1156                         }
1157                 }
1158
1159                 OStatus::getAttachment($doc, $entry, $item);
1160         }
1161
1162         /**
1163          * Fetch or create title for feed entry
1164          *
1165          * @param array $item
1166          * @return string title
1167          */
1168         private static function getTitle(array $item)
1169         {
1170                 if ($item['title'] != '') {
1171                         return BBCode::convertForUriId($item['uri-id'], $item['title'], BBCode::ACTIVITYPUB);
1172                 }
1173
1174                 // Fetch information about the post
1175                 $siteinfo = BBCode::getAttachedData($item["body"]);
1176                 if (isset($siteinfo["title"])) {
1177                         return $siteinfo["title"];
1178                 }
1179
1180                 // If no bookmark is found then take the first line
1181                 // Remove the share element before fetching the first line
1182                 $title = trim(preg_replace("/\[share.*?\](.*?)\[\/share\]/ism","\n$1\n",$item['body']));
1183
1184                 $title = BBCode::toPlaintext($title)."\n";
1185                 $pos = strpos($title, "\n");
1186                 $trailer = "";
1187                 if (($pos == 0) || ($pos > 100)) {
1188                         $pos = 100;
1189                         $trailer = "...";
1190                 }
1191
1192                 return substr($title, 0, $pos) . $trailer;
1193         }
1194 }