src/Protocol/Feed.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   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\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\Strings;
  43 use Friendica\Util\XML;
  44
  45 /**
  46  * This class contain functions to import feeds (RSS/RDF/Atom)
  47  */
  48 class Feed
  49 {
  50         /**
  51          * consume - process atom feed and update anything/everything we might need to update
  52          *
  53          * $xml = the (atom) feed to consume - RSS isn't as fully supported but may work for simple feeds.
  54          *
  55          * $importer = the contact_record (joined to user_record) of the local user who owns this relationship.
  56          *             It is this person's stuff that is going to be updated.
  57          * $contact =  the person who is sending us stuff. If not set, we MAY be processing a "follow" activity
  58          *             from an external network and MAY create an appropriate contact record. Otherwise, we MUST
  59          *             have a contact record.
  60          * $hub = should we find a hub declation in the feed, pass it back to our calling process, who might (or
  61          *        might not) try and subscribe to it.
  62          * $datedir sorts in reverse order
  63          * $pass - by default ($pass = 0) we cannot guarantee that a parent item has been
  64          *      imported prior to its children being seen in the stream unless we are certain
  65          *      of how the feed is arranged/ordered.
  66          * With $pass = 1, we only pull parent items out of the stream.
  67          * With $pass = 2, we only pull children (comments/likes).
  68          *
  69          * So running this twice, first with pass 1 and then with pass 2 will do the right
  70          * thing regardless of feed ordering. This won't be adequate in a fully-threaded
  71          * model where comments can have sub-threads. That would require some massive sorting
  72          * to get all the feed items into a mostly linear ordering, and might still require
  73          * recursion.
  74          *
  75          * @param       $xml
  76          * @param array $importer
  77          * @param array $contact
  78          * @param       $hub
  79          * @throws ImagickException
  80          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  81          */
  82         public static function consume($xml, array $importer, array $contact, &$hub)
  83         {
  84                 if ($contact['network'] === Protocol::OSTATUS) {
  85                         Logger::info('Consume OStatus messages');
  86                         OStatus::import($xml, $importer, $contact, $hub);
  87
  88                         return;
  89                 }
  90
  91                 if ($contact['network'] === Protocol::FEED) {
  92                         Logger::info('Consume feeds');
  93                         self::import($xml, $importer, $contact);
  94
  95                         return;
  96                 }
  97
  98                 if ($contact['network'] === Protocol::DFRN) {
  99                         Logger::info('Consume DFRN messages');
 100                         $dfrn_importer = DFRN::getImporter($contact['id'], $importer['uid']);
 101                         if (!empty($dfrn_importer)) {
 102                                 Logger::info('Now import the DFRN feed');
 103                                 DFRN::import($xml, $dfrn_importer, true);
 104                                 return;
 105                         }
 106                 }
 107         }
 108
 109         /**
 110          * Read a RSS/RDF/Atom feed and create an item entry for it
 111          *
 112          * @param string $xml      The feed data
 113          * @param array  $importer The user record of the importer
 114          * @param array  $contact  The contact record of the feed
 115          *
 116          * @return array Returns the header and the first item in dry run mode
 117          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 118          */
 119         public static function import($xml, array $importer = [], array $contact = [])
 120         {
 121                 $dryRun = empty($importer) && empty($contact);
 122
 123                 if ($dryRun) {
 124                         Logger::info("Test Atom/RSS feed");
 125                 } else {
 126                         Logger::info("Import Atom/RSS feed '" . $contact["name"] . "' (Contact " . $contact["id"] . ") for user " . $importer["uid"]);
 127                 }
 128
 129                 if (empty($xml)) {
 130                         Logger::info('XML is empty.');
 131                         return [];
 132                 }
 133
 134                 if (!empty($contact['poll'])) {
 135                         $basepath = $contact['poll'];
 136                 } elseif (!empty($contact['url'])) {
 137                         $basepath = $contact['url'];
 138                 } else {
 139                         $basepath = '';
 140                 }
 141
 142                 $doc = new DOMDocument();
 143                 @$doc->loadXML(trim($xml));
 144                 $xpath = new DOMXPath($doc);
 145                 $xpath->registerNamespace('atom', ActivityNamespace::ATOM1);
 146                 $xpath->registerNamespace('dc', "http://purl.org/dc/elements/1.1/");
 147                 $xpath->registerNamespace('content', "http://purl.org/rss/1.0/modules/content/");
 148                 $xpath->registerNamespace('rdf', "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
 149                 $xpath->registerNamespace('rss', "http://purl.org/rss/1.0/");
 150                 $xpath->registerNamespace('media', "http://search.yahoo.com/mrss/");
 151                 $xpath->registerNamespace('poco', ActivityNamespace::POCO);
 152
 153                 $author = [];
 154                 $entries = null;
 155
 156                 // Is it RDF?
 157                 if ($xpath->query('/rdf:RDF/rss:channel')->length > 0) {
 158                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:link/text()');
 159                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:title/text()');
 160
 161                         if (empty($author["author-name"])) {
 162                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:description/text()');
 163                         }
 164                         $entries = $xpath->query('/rdf:RDF/rss:item');
 165                 }
 166
 167                 // Is it Atom?
 168                 if ($xpath->query('/atom:feed')->length > 0) {
 169                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']");
 170                         if (is_object($alternate)) {
 171                                 foreach ($alternate AS $attribute) {
 172                                         if ($attribute->name == "href") {
 173                                                 $author["author-link"] = $attribute->textContent;
 174                                         }
 175                                 }
 176                         }
 177
 178                         if (empty($author["author-link"])) {
 179                                 $self = XML::getFirstAttributes($xpath, "atom:link[@rel='self']");
 180                                 if (is_object($self)) {
 181                                         foreach ($self AS $attribute) {
 182                                                 if ($attribute->name == "href") {
 183                                                         $author["author-link"] = $attribute->textContent;
 184                                                 }
 185                                         }
 186                                 }
 187                         }
 188
 189                         if (empty($author["author-link"])) {
 190                                 $author["author-link"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:id/text()');
 191                         }
 192                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:logo/text()');
 193
 194                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:title/text()');
 195
 196                         if (empty($author["author-name"])) {
 197                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:subtitle/text()');
 198                         }
 199
 200                         if (empty($author["author-name"])) {
 201                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:name/text()');
 202                         }
 203
 204                         $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()');
 205                         if ($value != "") {
 206                                 $author["author-name"] = $value;
 207                         }
 208
 209                         if ($dryRun) {
 210                                 $author["author-id"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:id/text()');
 211
 212                                 // See https://tools.ietf.org/html/rfc4287#section-3.2.2
 213                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()');
 214                                 if ($value != "") {
 215                                         $author["author-link"] = $value;
 216                                 }
 217
 218                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()');
 219                                 if ($value != "") {
 220                                         $author["author-nick"] = $value;
 221                                 }
 222
 223                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:address/poco:formatted/text()');
 224                                 if ($value != "") {
 225                                         $author["author-location"] = $value;
 226                                 }
 227
 228                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:note/text()');
 229                                 if ($value != "") {
 230                                         $author["author-about"] = $value;
 231                                 }
 232
 233                                 $avatar = XML::getFirstAttributes($xpath, "atom:author/atom:link[@rel='avatar']");
 234                                 if (is_object($avatar)) {
 235                                         foreach ($avatar AS $attribute) {
 236                                                 if ($attribute->name == "href") {
 237                                                         $author["author-avatar"] = $attribute->textContent;
 238                                                 }
 239                                         }
 240                                 }
 241                         }
 242
 243                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:updated/text()');
 244
 245                         $author["app"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:generator/text()');
 246
 247                         $entries = $xpath->query('/atom:feed/atom:entry');
 248                 }
 249
 250                 // Is it RSS?
 251                 if ($xpath->query('/rss/channel')->length > 0) {
 252                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rss/channel/link/text()');
 253
 254                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/title/text()');
 255                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/rss/channel/image/url/text()');
 256
 257                         if (empty($author["author-name"])) {
 258                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/copyright/text()');
 259                         }
 260
 261                         if (empty($author["author-name"])) {
 262                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/description/text()');
 263                         }
 264
 265                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/rss/channel/pubDate/text()');
 266
 267                         $author["app"] = XML::getFirstNodeValue($xpath, '/rss/channel/generator/text()');
 268
 269                         $entries = $xpath->query('/rss/channel/item');
 270                 }
 271
 272                 if (!$dryRun) {
 273                         $author["author-link"] = $contact["url"];
 274
 275                         if (empty($author["author-name"])) {
 276                                 $author["author-name"] = $contact["name"];
 277                         }
 278
 279                         $author["author-avatar"] = $contact["thumb"];
 280
 281                         $author["owner-link"] = $contact["url"];
 282                         $author["owner-name"] = $contact["name"];
 283                         $author["owner-avatar"] = $contact["thumb"];
 284                 }
 285
 286                 $header = [];
 287                 $header["uid"] = $importer["uid"] ?? 0;
 288                 $header["network"] = Protocol::FEED;
 289                 $header["wall"] = 0;
 290                 $header["origin"] = 0;
 291                 $header["gravity"] = GRAVITY_PARENT;
 292                 $header["private"] = Item::PUBLIC;
 293                 $header["verb"] = Activity::POST;
 294                 $header["object-type"] = Activity\ObjectType::NOTE;
 295
 296                 $header["contact-id"] = $contact["id"] ?? 0;
 297
 298                 if (!is_object($entries)) {
 299                         Logger::info("There are no entries in this feed.");
 300                         return [];
 301                 }
 302
 303                 $items = [];
 304                 $creation_dates = [];
 305
 306                 // Limit the number of items that are about to be fetched
 307                 $total_items = ($entries->length - 1);
 308                 $max_items = DI::config()->get('system', 'max_feed_items');
 309                 if (($max_items > 0) && ($total_items > $max_items)) {
 310                         $total_items = $max_items;
 311                 }
 312
 313                 // Importing older entries first
 314                 for ($i = $total_items; $i >= 0; --$i) {
 315                         $entry = $entries->item($i);
 316
 317                         $item = array_merge($header, $author);
 318
 319                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']", $entry);
 320                         if (!is_object($alternate)) {
 321                                 $alternate = XML::getFirstAttributes($xpath, "atom:link", $entry);
 322                         }
 323                         if (is_object($alternate)) {
 324                                 foreach ($alternate AS $attribute) {
 325                                         if ($attribute->name == "href") {
 326                                                 $item["plink"] = $attribute->textContent;
 327                                         }
 328                                 }
 329                         }
 330
 331                         if (empty($item["plink"])) {
 332                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'link/text()', $entry);
 333                         }
 334
 335                         if (empty($item["plink"])) {
 336                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'rss:link/text()', $entry);
 337                         }
 338
 339                         $item["uri"] = XML::getFirstNodeValue($xpath, 'atom:id/text()', $entry);
 340
 341                         if (empty($item["uri"])) {
 342                                 $item["uri"] = XML::getFirstNodeValue($xpath, 'guid/text()', $entry);
 343                         }
 344
 345                         if (empty($item["uri"])) {
 346                                 $item["uri"] = $item["plink"];
 347                         }
 348
 349                         // Add the base path if missing
 350                         $item["uri"] = Network::addBasePath($item["uri"], $basepath);
 351                         $item["plink"] = Network::addBasePath($item["plink"], $basepath);
 352
 353                         $orig_plink = $item["plink"];
 354
 355                         $item["plink"] = DI::httpRequest()->finalUrl($item["plink"]);
 356
 357                         $item["parent-uri"] = $item["uri"];
 358
 359                         $item["title"] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
 360
 361                         if (empty($item["title"])) {
 362                                 $item["title"] = XML::getFirstNodeValue($xpath, 'title/text()', $entry);
 363                         }
 364                         if (empty($item["title"])) {
 365                                 $item["title"] = XML::getFirstNodeValue($xpath, 'rss:title/text()', $entry);
 366                         }
 367
 368                         $item["title"] = html_entity_decode($item["title"], ENT_QUOTES, 'UTF-8');
 369
 370                         $published = XML::getFirstNodeValue($xpath, 'atom:published/text()', $entry);
 371
 372                         if (empty($published)) {
 373                                 $published = XML::getFirstNodeValue($xpath, 'pubDate/text()', $entry);
 374                         }
 375
 376                         if (empty($published)) {
 377                                 $published = XML::getFirstNodeValue($xpath, 'dc:date/text()', $entry);
 378                         }
 379
 380                         $updated = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $entry);
 381
 382                         if (empty($updated) && !empty($published)) {
 383                                 $updated = $published;
 384                         }
 385
 386                         if (empty($published) && !empty($updated)) {
 387                                 $published = $updated;
 388                         }
 389
 390                         if ($published != "") {
 391                                 $item["created"] = $published;
 392                         }
 393
 394                         if ($updated != "") {
 395                                 $item["edited"] = $updated;
 396                         }
 397
 398                         if (!$dryRun) {
 399                                 $condition = ["`uid` = ? AND `uri` = ? AND `network` IN (?, ?)",
 400                                         $importer["uid"], $item["uri"], Protocol::FEED, Protocol::DFRN];
 401                                 $previous = Item::selectFirst(['id', 'created'], $condition);
 402                                 if (DBA::isResult($previous)) {
 403                                         // Use the creation date when the post had been stored. It can happen this date changes in the feed.
 404                                         $creation_dates[] = $previous['created'];
 405                                         Logger::info("Item with uri " . $item["uri"] . " for user " . $importer["uid"] . " already existed under id " . $previous["id"]);
 406                                         continue;
 407                                 }
 408                                 $creation_dates[] = DateTimeFormat::utc($item['created']);
 409                         }
 410
 411                         $creator = XML::getFirstNodeValue($xpath, 'author/text()', $entry);
 412
 413                         if (empty($creator)) {
 414                                 $creator = XML::getFirstNodeValue($xpath, 'atom:author/atom:name/text()', $entry);
 415                         }
 416
 417                         if (empty($creator)) {
 418                                 $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 419                         }
 420
 421                         if ($creator != "") {
 422                                 $item["author-name"] = $creator;
 423                         }
 424
 425                         $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 426
 427                         if ($creator != "") {
 428                                 $item["author-name"] = $creator;
 429                         }
 430
 431                         /// @TODO ?
 432                         // <category>Ausland</category>
 433                         // <media:thumbnail width="152" height="76" url="http://www.taz.de/picture/667875/192/14388767.jpg"/>
 434
 435                         $attachments = [];
 436
 437                         $enclosures = $xpath->query("enclosure|atom:link[@rel='enclosure']", $entry);
 438                         foreach ($enclosures AS $enclosure) {
 439                                 $href = "";
 440                                 $length = null;
 441                                 $type = null;
 442
 443                                 foreach ($enclosure->attributes AS $attribute) {
 444                                         if (in_array($attribute->name, ["url", "href"])) {
 445                                                 $href = $attribute->textContent;
 446                                         } elseif ($attribute->name == "length") {
 447                                                 $length = (int)$attribute->textContent;
 448                                         } elseif ($attribute->name == "type") {
 449                                                 $type = $attribute->textContent;
 450                                         }
 451                                 }
 452
 453                                 if (!empty($href)) {
 454                                         $attachments[] = ['type' => Post\Media::DOCUMENT, 'url' => $href, 'mimetype' => $type, 'size' => $length];
 455                                 }
 456                         }
 457
 458                         $taglist = [];
 459                         $categories = $xpath->query("category", $entry);
 460                         foreach ($categories AS $category) {
 461                                 $taglist[] = $category->nodeValue;
 462                         }
 463
 464                         $body = trim(XML::getFirstNodeValue($xpath, 'atom:content/text()', $entry));
 465
 466                         if (empty($body)) {
 467                                 $body = trim(XML::getFirstNodeValue($xpath, 'content:encoded/text()', $entry));
 468                         }
 469
 470                         $summary = trim(XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry));
 471
 472                         if (empty($summary)) {
 473                                 $summary = trim(XML::getFirstNodeValue($xpath, 'description/text()', $entry));
 474                         }
 475
 476                         if (empty($body)) {
 477                                 $body = $summary;
 478                                 $summary = '';
 479                         }
 480
 481                         if ($body == $summary) {
 482                                 $summary = '';
 483                         }
 484
 485                         // remove the content of the title if it is identically to the body
 486                         // This helps with auto generated titles e.g. from tumblr
 487                         if (self::titleIsBody($item["title"], $body)) {
 488                                 $item["title"] = "";
 489                         }
 490                         $item["body"] = HTML::toBBCode($body, $basepath);
 491
 492                         // Remove tracking pixels
 493                         $item["body"] = preg_replace("/\[img=1x1\]([^\[\]]*)\[\/img\]/Usi", '', $item["body"]);
 494
 495                         if (($item["body"] == '') && ($item["title"] != '')) {
 496                                 $item["body"] = $item["title"];
 497                                 $item["title"] = '';
 498                         }
 499
 500                         if ($dryRun) {
 501                                 $items[] = $item;
 502                                 break;
 503                         } elseif (!Item::isValid($item)) {
 504                                 Logger::info('Feed is invalid', ['created' => $item['created'], 'uid' => $item['uid'], 'uri' => $item['uri']]);
 505                                 continue;
 506                         }
 507
 508                         $preview = '';
 509                         if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] < 3)) {
 510                                 // Handle enclosures and treat them as preview picture
 511                                 foreach ($attachments AS $attachment) {
 512                                         if ($attachment["mimetype"] == "image/jpeg") {
 513                                                 $preview = $attachment["url"];
 514                                         }
 515                                 }
 516
 517                                 // Remove a possible link to the item itself
 518                                 $item["body"] = str_replace($item["plink"], '', $item["body"]);
 519                                 $item["body"] = trim(preg_replace('/\[url\=\](\w+.*?)\[\/url\]/i', '', $item["body"]));
 520
 521                                 // Replace the content when the title is longer than the body
 522                                 $replace = (strlen($item["title"]) > strlen($item["body"]));
 523
 524                                 // Replace it, when there is an image in the body
 525                                 if (strstr($item["body"], '[/img]')) {
 526                                         $replace = true;
 527                                 }
 528
 529                                 // Replace it, when there is a link in the body
 530                                 if (strstr($item["body"], '[/url]')) {
 531                                         $replace = true;
 532                                 }
 533
 534                                 $saved_body = $item["body"];
 535                                 $saved_title = $item["title"];
 536
 537                                 if ($replace) {
 538                                         $item["body"] = trim($item["title"]);
 539                                 }
 540
 541                                 $data = ParseUrl::getSiteinfoCached($item['plink'], true);
 542                                 if (!empty($data['text']) && !empty($data['title']) && (mb_strlen($item['body']) < mb_strlen($data['text']))) {
 543                                         // When the fetched page info text is longer than the body, we do try to enhance the body
 544                                         if (!empty($item['body']) && (strpos($data['title'], $item['body']) === false) && (strpos($data['text'], $item['body']) === false)) {
 545                                                 // The body is not part of the fetched page info title or page info text. So we add the text to the body
 546                                                 $item['body'] .= "\n\n" . $data['text'];
 547                                         } else {
 548                                                 // Else we replace the body with the page info text
 549                                                 $item['body'] = $data['text'];
 550                                         }
 551                                 }
 552
 553                                 $data = PageInfo::queryUrl($item["plink"], false, $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_denylist"] ?? '');
 554
 555                                 if (!empty($data)) {
 556                                         // Take the data that was provided by the feed if the query is empty
 557                                         if (($data['type'] == 'link') && empty($data['title']) && empty($data['text'])) {
 558                                                 $data['title'] = $saved_title;
 559                                                 $item["body"] = $saved_body;
 560                                         }
 561
 562                                         $data_text = strip_tags(trim($data['text'] ?? ''));
 563                                         $item_body = strip_tags(trim($item['body'] ?? ''));
 564
 565                                         if (!empty($data_text) && (($data_text == $item_body) || strstr($item_body, $data_text))) {
 566                                                 $data['text'] = '';
 567                                         }
 568
 569                                         // We always strip the title since it will be added in the page information
 570                                         $item["title"] = "";
 571                                         $item["body"] = $item["body"] . "\n" . PageInfo::getFooterFromData($data, false);
 572                                         $taglist = $contact["fetch_further_information"] == 2 ? PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"] ?? '') : [];
 573                                         $item["object-type"] = Activity\ObjectType::BOOKMARK;
 574                                         $attachments = [];
 575                                 }
 576                         } else {
 577                                 if (!empty($summary)) {
 578                                         $item["body"] = '[abstract]' . HTML::toBBCode($summary, $basepath) . "[/abstract]\n" . $item["body"];
 579                                 }
 580
 581                                 if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] == 3)) {
 582                                         if (empty($taglist)) {
 583                                                 $taglist = PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"] ?? '');
 584                                         }
 585                                         $item["body"] .= "\n" . self::tagToString($taglist);
 586                                 } else {
 587                                         $taglist = [];
 588                                 }
 589
 590                                 // Add the link to the original feed entry if not present in feed
 591                                 if (($item['plink'] != '') && !strstr($item["body"], $item['plink'])) {
 592                                         $item["body"] .= "[hr][url]" . $item['plink'] . "[/url]";
 593                                 }
 594                         }
 595
 596                         Logger::info('Stored feed', ['item' => $item]);
 597
 598                         $notify = Item::isRemoteSelf($contact, $item);
 599
 600                         // Distributed items should have a well formatted URI.
 601                         // Additionally we have to avoid conflicts with identical URI between imported feeds and these items.
 602                         if ($notify) {
 603                                 $item['guid'] = Item::guidFromUri($orig_plink, DI::baseUrl()->getHostname());
 604                                 unset($item['uri']);
 605                                 unset($item['parent-uri']);
 606
 607                                 // Set the delivery priority for "remote self" to "medium"
 608                                 $notify = PRIORITY_MEDIUM;
 609                         }
 610
 611                         $id = Item::insert($item, $notify);
 612
 613                         Logger::info("Feed for contact " . $contact["url"] . " stored under id " . $id);
 614
 615                         if (!empty($id) && (!empty($taglist) || !empty($attachments))) {
 616                                 $feeditem = Item::selectFirst(['uri-id'], ['id' => $id]);
 617                                 foreach ($taglist as $tag) {
 618                                         Tag::store($feeditem['uri-id'], Tag::HASHTAG, $tag);
 619                                 }
 620                                 foreach ($attachments as $attachment) {
 621                                         $attachment['uri-id'] = $feeditem['uri-id'];
 622                                         Post\Media::insert($attachment);
 623                                 }
 624                         }
 625                 }
 626
 627                 if (!$dryRun && DI::config()->get('system', 'adjust_poll_frequency')) {
 628                         self::adjustPollFrequency($contact, $creation_dates);
 629                 }
 630
 631                 return ["header" => $author, "items" => $items];
 632         }
 633
 634         /**
 635          * Automatically adjust the poll frequency according to the post frequency
 636          *
 637          * @param array $contact
 638          * @param array $creation_dates
 639          * @return void
 640          */
 641         private static function adjustPollFrequency(array $contact, array $creation_dates)
 642         {
 643                 if ($contact['network'] != Protocol::FEED) {
 644                         Logger::info('Contact is no feed, skip.', ['id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url'], 'network' => $contact['network']]);
 645                         return;
 646                 }
 647
 648                 if (!empty($creation_dates)) {
 649                         // Count the post frequency and the earliest and latest post date
 650                         $frequency = [];
 651                         $oldest = time();
 652                         $newest = 0;
 653                         $oldest_date = $newest_date = '';
 654
 655                         foreach ($creation_dates as $date) {
 656                                 $timestamp = strtotime($date);
 657                                 $day = intdiv($timestamp, 86400);
 658                                 $hour = $timestamp % 86400;
 659
 660                                 // Only have a look at values from the last seven days
 661                                 if (((time() / 86400) - $day) < 7) {
 662                                         if (empty($frequency[$day])) {
 663                                                 $frequency[$day] = ['count' => 1, 'low' => $hour, 'high' => $hour];
 664                                         } else {
 665                                                 ++$frequency[$day]['count'];
 666                                                 if ($frequency[$day]['low'] > $hour) {
 667                                                         $frequency[$day]['low'] = $hour;
 668                                                 }
 669                                                 if ($frequency[$day]['high'] < $hour) {
 670                                                         $frequency[$day]['high'] = $hour;
 671                                                 }
 672                                         }
 673                                 }
 674                                 if ($oldest > $day) {
 675                                         $oldest = $day;
 676                                         $oldest_date = $date;
 677                                 }
 678
 679                                 if ($newest < $day) {
 680                                         $newest = $day;
 681                                         $newest_date = $date;
 682                                 }
 683                         }
 684
 685                         if (count($creation_dates) == 1) {
 686                                 Logger::info('Feed had posted a single time, switching to daily polling', ['newest' => $newest_date, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 687                                 $priority = 8; // Poll once a day
 688                         }
 689
 690                         if (empty($priority) && (((time() / 86400) - $newest) > 730)) {
 691                                 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']]);
 692                                 $priority = 10; // Poll every month
 693                         }
 694
 695                         if (empty($priority) && (((time() / 86400) - $newest) > 365)) {
 696                                 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']]);
 697                                 $priority = 9; // Poll every week
 698                         }
 699
 700                         if (empty($priority) && empty($frequency)) {
 701                                 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']]);
 702                                 $priority = 8; // Poll once a day
 703                         }
 704
 705                         if (empty($priority)) {
 706                                 // Calculate the highest "posts per day" value
 707                                 $max = 0;
 708                                 foreach ($frequency as $entry) {
 709                                         if (($entry['count'] == 1) || ($entry['high'] == $entry['low'])) {
 710                                                 continue;
 711                                         }
 712
 713                                         // We take the earliest and latest post day and interpolate the number of post per day
 714                                         // that would had been created with this post frequency
 715
 716                                         // Assume at least four hours between oldest and newest post per day - should be okay for news outlets
 717                                         $duration = max($entry['high'] - $entry['low'], 14400);
 718                                         $ppd = (86400 / $duration) * $entry['count'];
 719                                         if ($ppd > $max) {
 720                                                 $max = $ppd;
 721                                         }
 722                                 }
 723                                 if ($max > 48) {
 724                                         $priority = 1; // Poll every quarter hour
 725                                 } elseif ($max > 24) {
 726                                         $priority = 2; // Poll half an hour
 727                                 } elseif ($max > 12) {
 728                                         $priority = 3; // Poll hourly
 729                                 } elseif ($max > 8) {
 730                                         $priority = 4; // Poll every two hours
 731                                 } elseif ($max > 4) {
 732                                         $priority = 5; // Poll every three hours
 733                                 } elseif ($max > 2) {
 734                                         $priority = 6; // Poll every six hours
 735                                 } else {
 736                                         $priority = 7; // Poll twice a day
 737                                 }
 738                                 Logger::info('Calculated priority by the posts per day', ['priority' => $priority, 'max' => round($max, 2), 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 739                         }
 740                 } else {
 741                         Logger::info('No posts, switching to daily polling', ['id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 742                         $priority = 8; // Poll once a day
 743                 }
 744
 745                 if ($contact['rating'] != $priority) {
 746                         Logger::notice('Adjusting priority', ['old' => $contact['rating'], 'new' => $priority, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 747                         DBA::update('contact', ['rating' => $priority], ['id' => $contact['id']]);
 748                 }
 749         }
 750
 751         /**
 752          * Convert a tag array to a tag string
 753          *
 754          * @param array $tags
 755          * @return string tag string
 756          */
 757         private static function tagToString(array $tags)
 758         {
 759                 $tagstr = '';
 760
 761                 foreach ($tags as $tag) {
 762                         if ($tagstr != "") {
 763                                 $tagstr .= ", ";
 764                         }
 765
 766                         $tagstr .= "#[url=" . DI::baseUrl() . "/search?tag=" . urlencode($tag) . "]" . $tag . "[/url]";
 767                 }
 768
 769                 return $tagstr;
 770         }
 771
 772         private static function titleIsBody($title, $body)
 773         {
 774                 $title = strip_tags($title);
 775                 $title = trim($title);
 776                 $title = html_entity_decode($title, ENT_QUOTES, 'UTF-8');
 777                 $title = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $title);
 778
 779                 $body = strip_tags($body);
 780                 $body = trim($body);
 781                 $body = html_entity_decode($body, ENT_QUOTES, 'UTF-8');
 782                 $body = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $body);
 783
 784                 if (strlen($title) < strlen($body)) {
 785                         $body = substr($body, 0, strlen($title));
 786                 }
 787
 788                 if (($title != $body) && (substr($title, -3) == "...")) {
 789                         $pos = strrpos($title, "...");
 790                         if ($pos > 0) {
 791                                 $title = substr($title, 0, $pos);
 792                                 $body = substr($body, 0, $pos);
 793                         }
 794                 }
 795                 return ($title == $body);
 796         }
 797
 798         /**
 799          * Creates the Atom feed for a given nickname
 800          *
 801          * Supported filters:
 802          * - activity (default): all the public posts
 803          * - posts: all the public top-level posts
 804          * - comments: all the public replies
 805          *
 806          * Updates the provided last_update parameter if the result comes from the
 807          * cache or it is empty
 808          *
 809          * @param string  $owner_nick  Nickname of the feed owner
 810          * @param string  $last_update Date of the last update
 811          * @param integer $max_items   Number of maximum items to fetch
 812          * @param string  $filter      Feed items filter (activity, posts or comments)
 813          * @param boolean $nocache     Wether to bypass caching
 814          *
 815          * @return string Atom feed
 816          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 817          * @throws \ImagickException
 818          */
 819         public static function atom($owner_nick, $last_update, $max_items = 300, $filter = 'activity', $nocache = false)
 820         {
 821                 $stamp = microtime(true);
 822
 823                 $owner = User::getOwnerDataByNick($owner_nick);
 824                 if (!$owner) {
 825                         return;
 826                 }
 827
 828                 $cachekey = "feed:feed:" . $owner_nick . ":" . $filter . ":" . $last_update;
 829
 830                 $previous_created = $last_update;
 831
 832                 // Don't cache when the last item was posted less then 15 minutes ago (Cache duration)
 833                 if ((time() - strtotime($owner['last-item'])) < 15*60) {
 834                         $result = DI::cache()->get($cachekey);
 835                         if (!$nocache && !is_null($result)) {
 836                                 Logger::info('Cached feed duration', ['seconds' => number_format(microtime(true) - $stamp, 3), 'nick' => $owner_nick, 'filter' => $filter, 'created' => $previous_created]);
 837                                 return $result['feed'];
 838                         }
 839                 }
 840
 841                 $check_date = empty($last_update) ? '' : DateTimeFormat::utc($last_update);
 842                 $authorid = Contact::getIdForURL($owner["url"]);
 843
 844                 $condition = ["`uid` = ? AND `received` > ? AND NOT `deleted` AND `gravity` IN (?, ?)
 845                         AND `private` != ? AND `visible` AND `wall` AND `parent-network` IN (?, ?, ?, ?)",
 846                         $owner["uid"], $check_date, GRAVITY_PARENT, GRAVITY_COMMENT,
 847                         Item::PRIVATE, Protocol::ACTIVITYPUB,
 848                         Protocol::OSTATUS, Protocol::DFRN, Protocol::DIASPORA];
 849
 850                 if ($filter === 'comments') {
 851                         $condition[0] .= " AND `object-type` = ? ";
 852                         $condition[] = Activity\ObjectType::COMMENT;
 853                 }
 854
 855                 if ($owner['account-type'] != User::ACCOUNT_TYPE_COMMUNITY) {
 856                         $condition[0] .= " AND `contact-id` = ? AND `author-id` = ?";
 857                         $condition[] = $owner["id"];
 858                         $condition[] = $authorid;
 859                 }
 860
 861                 $params = ['order' => ['received' => true], 'limit' => $max_items];
 862
 863                 if ($filter === 'posts') {
 864                         $ret = Item::selectThread([], $condition, $params);
 865                 } else {
 866                         $ret = Item::select([], $condition, $params);
 867                 }
 868
 869                 $items = Item::inArray($ret);
 870
 871                 $doc = new DOMDocument('1.0', 'utf-8');
 872                 $doc->formatOutput = true;
 873
 874                 $root = self::addHeader($doc, $owner, $filter);
 875
 876                 foreach ($items as $item) {
 877                         $entry = self::entry($doc, $item, $owner);
 878                         $root->appendChild($entry);
 879
 880                         if ($last_update < $item['created']) {
 881                                 $last_update = $item['created'];
 882                         }
 883                 }
 884
 885                 $feeddata = trim($doc->saveXML());
 886
 887                 $msg = ['feed' => $feeddata, 'last_update' => $last_update];
 888                 DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
 889
 890                 Logger::info('Feed duration', ['seconds' => number_format(microtime(true) - $stamp, 3), 'nick' => $owner_nick, 'filter' => $filter, 'created' => $previous_created]);
 891
 892                 return $feeddata;
 893         }
 894
 895         /**
 896          * Adds the header elements to the XML document
 897          *
 898          * @param DOMDocument $doc       XML document
 899          * @param array       $owner     Contact data of the poster
 900          * @param string      $filter    The related feed filter (activity, posts or comments)
 901          *
 902          * @return object header root element
 903          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 904          */
 905         private static function addHeader(DOMDocument $doc, array $owner, $filter)
 906         {
 907                 $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 908                 $doc->appendChild($root);
 909
 910                 $title = '';
 911                 $selfUri = '/feed/' . $owner["nick"] . '/';
 912                 switch ($filter) {
 913                         case 'activity':
 914                                 $title = DI::l10n()->t('%s\'s timeline', $owner['name']);
 915                                 $selfUri .= $filter;
 916                                 break;
 917                         case 'posts':
 918                                 $title = DI::l10n()->t('%s\'s posts', $owner['name']);
 919                                 break;
 920                         case 'comments':
 921                                 $title = DI::l10n()->t('%s\'s comments', $owner['name']);
 922                                 $selfUri .= $filter;
 923                                 break;
 924                 }
 925
 926                 $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION . "-" . DB_UPDATE_VERSION];
 927                 XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
 928                 XML::addElement($doc, $root, "id", DI::baseUrl() . "/profile/" . $owner["nick"]);
 929                 XML::addElement($doc, $root, "title", $title);
 930                 XML::addElement($doc, $root, "subtitle", sprintf("Updates from %s on %s", $owner["name"], DI::config()->get('config', 'sitename')));
 931                 XML::addElement($doc, $root, "logo", $owner["photo"]);
 932                 XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
 933
 934                 $author = self::addAuthor($doc, $owner);
 935                 $root->appendChild($author);
 936
 937                 $attributes = ["href" => $owner["url"], "rel" => "alternate", "type" => "text/html"];
 938                 XML::addElement($doc, $root, "link", "", $attributes);
 939
 940                 OStatus::hublinks($doc, $root, $owner["nick"]);
 941
 942                 $attributes = ["href" => DI::baseUrl() . $selfUri, "rel" => "self", "type" => "application/atom+xml"];
 943                 XML::addElement($doc, $root, "link", "", $attributes);
 944
 945                 return $root;
 946         }
 947
 948         /**
 949          * Adds the author element to the XML document
 950          *
 951          * @param DOMDocument $doc          XML document
 952          * @param array       $owner        Contact data of the poster
 953          *
 954          * @return \DOMElement author element
 955          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 956          */
 957         private static function addAuthor(DOMDocument $doc, array $owner)
 958         {
 959                 $author = $doc->createElement("author");
 960                 XML::addElement($doc, $author, "uri", $owner["url"]);
 961                 XML::addElement($doc, $author, "name", $owner["nick"]);
 962                 XML::addElement($doc, $author, "email", $owner["addr"]);
 963
 964                 return $author;
 965         }
 966
 967         /**
 968          * Adds an entry element to the XML document
 969          *
 970          * @param DOMDocument $doc       XML document
 971          * @param array       $item      Data of the item that is to be posted
 972          * @param array       $owner     Contact data of the poster
 973          * @param bool        $toplevel  optional default false
 974          *
 975          * @return \DOMElement Entry element
 976          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 977          * @throws \ImagickException
 978          */
 979         private static function entry(DOMDocument $doc, array $item, array $owner)
 980         {
 981                 $xml = null;
 982
 983                 $repeated_guid = OStatus::getResharedGuid($item);
 984                 if ($repeated_guid != "") {
 985                         $xml = self::reshareEntry($doc, $item, $owner, $repeated_guid);
 986                 }
 987
 988                 if ($xml) {
 989                         return $xml;
 990                 }
 991
 992                 return self::noteEntry($doc, $item, $owner);
 993         }
 994
 995                 /**
 996          * Adds an entry element with reshared content
 997          *
 998          * @param DOMDocument $doc           XML document
 999          * @param array       $item          Data of the item that is to be posted
1000          * @param array       $owner         Contact data of the poster
1001          * @param string      $repeated_guid guid
1002          * @param bool        $toplevel      Is it for en entry element (false) or a feed entry (true)?
1003          *
1004          * @return bool Entry element
1005          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1006          * @throws \ImagickException
1007          */
1008         private static function reshareEntry(DOMDocument $doc, array $item, array $owner, $repeated_guid)
1009         {
1010                 if (($item['gravity'] != GRAVITY_PARENT) && (Strings::normaliseLink($item["author-link"]) != Strings::normaliseLink($owner["url"]))) {
1011                         Logger::info('Feed entry author does not match feed owner', ['owner' => $owner["url"], 'author' => $item["author-link"]]);
1012                 }
1013
1014                 $entry = OStatus::entryHeader($doc, $owner, $item, false);
1015
1016                 $condition = ['uid' => $owner["uid"], 'guid' => $repeated_guid, 'private' => [Item::PUBLIC, Item::UNLISTED],
1017                         'network' => Protocol::FEDERATED];
1018                 $repeated_item = Item::selectFirst([], $condition);
1019                 if (!DBA::isResult($repeated_item)) {
1020                         return false;
1021                 }
1022
1023                 self::entryContent($doc, $entry, $item, self::getTitle($repeated_item), Activity::SHARE, false);
1024
1025                 self::entryFooter($doc, $entry, $item, $owner);
1026
1027                 return $entry;
1028         }
1029
1030         /**
1031          * Adds a regular entry element
1032          *
1033          * @param DOMDocument $doc       XML document
1034          * @param array       $item      Data of the item that is to be posted
1035          * @param array       $owner     Contact data of the poster
1036          * @param bool        $toplevel  Is it for en entry element (false) or a feed entry (true)?
1037          *
1038          * @return \DOMElement Entry element
1039          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1040          * @throws \ImagickException
1041          */
1042         private static function noteEntry(DOMDocument $doc, array $item, array $owner)
1043         {
1044                 if (($item['gravity'] != GRAVITY_PARENT) && (Strings::normaliseLink($item["author-link"]) != Strings::normaliseLink($owner["url"]))) {
1045                         Logger::info('Feed entry author does not match feed owner', ['owner' => $owner["url"], 'author' => $item["author-link"]]);
1046                 }
1047
1048                 $entry = OStatus::entryHeader($doc, $owner, $item, false);
1049
1050                 self::entryContent($doc, $entry, $item, self::getTitle($item), '', true);
1051
1052                 self::entryFooter($doc, $entry, $item, $owner);
1053
1054                 return $entry;
1055         }
1056
1057         /**
1058          * Adds elements to the XML document
1059          *
1060          * @param DOMDocument $doc       XML document
1061          * @param \DOMElement $entry     Entry element where the content is added
1062          * @param array       $item      Data of the item that is to be posted
1063          * @param array       $owner     Contact data of the poster
1064          * @param string      $title     Title for the post
1065          * @param string      $verb      The activity verb
1066          * @param bool        $complete  Add the "status_net" element?
1067          * @param bool        $feed_mode Behave like a regular feed for users if true
1068          * @return void
1069          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1070          */
1071         private static function entryContent(DOMDocument $doc, \DOMElement $entry, array $item, $title, $verb = "", $complete = true)
1072         {
1073                 if ($verb == "") {
1074                         $verb = OStatus::constructVerb($item);
1075                 }
1076
1077                 XML::addElement($doc, $entry, "id", $item["uri"]);
1078                 XML::addElement($doc, $entry, "title", html_entity_decode($title, ENT_QUOTES, 'UTF-8'));
1079
1080                 $body = OStatus::formatPicturePost($item['body']);
1081
1082                 $body = BBCode::convert($body, false, BBCode::OSTATUS);
1083
1084                 XML::addElement($doc, $entry, "content", $body, ["type" => "html"]);
1085
1086                 XML::addElement($doc, $entry, "link", "", ["rel" => "alternate", "type" => "text/html",
1087                                                                 "href" => DI::baseUrl()."/display/".$item["guid"]]
1088                 );
1089
1090                 XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM));
1091                 XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM));
1092         }
1093
1094         /**
1095          * Adds the elements at the foot of an entry to the XML document
1096          *
1097          * @param DOMDocument $doc       XML document
1098          * @param object      $entry     The entry element where the elements are added
1099          * @param array       $item      Data of the item that is to be posted
1100          * @param array       $owner     Contact data of the poster
1101          * @param bool        $complete  default true
1102          * @return void
1103          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1104          */
1105         private static function entryFooter(DOMDocument $doc, $entry, array $item, array $owner)
1106         {
1107                 $mentioned = [];
1108
1109                 if ($item['gravity'] != GRAVITY_PARENT) {
1110                         $parent = Item::selectFirst(['guid', 'author-link', 'owner-link'], ['id' => $item['parent']]);
1111                         $parent_item = (($item['thr-parent']) ? $item['thr-parent'] : $item['parent-uri']);
1112
1113                         $thrparent = Item::selectFirst(['guid', 'author-link', 'owner-link', 'plink'], ['uid' => $owner["uid"], 'uri' => $parent_item]);
1114
1115                         if (DBA::isResult($thrparent)) {
1116                                 $mentioned[$thrparent["author-link"]] = $thrparent["author-link"];
1117                                 $mentioned[$thrparent["owner-link"]] = $thrparent["owner-link"];
1118                                 $parent_plink = $thrparent["plink"];
1119                         } else {
1120                                 $mentioned[$parent["author-link"]] = $parent["author-link"];
1121                                 $mentioned[$parent["owner-link"]] = $parent["owner-link"];
1122                                 $parent_plink = DI::baseUrl()."/display/".$parent["guid"];
1123                         }
1124
1125                         $attributes = [
1126                                         "ref" => $parent_item,
1127                                         "href" => $parent_plink];
1128                         XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
1129
1130                         $attributes = [
1131                                         "rel" => "related",
1132                                         "href" => $parent_plink];
1133                         XML::addElement($doc, $entry, "link", "", $attributes);
1134                 }
1135
1136                 // uri-id isn't present for follow entry pseudo-items
1137                 $tags = Tag::getByURIId($item['uri-id'] ?? 0);
1138                 foreach ($tags as $tag) {
1139                         $mentioned[$tag['url']] = $tag['url'];
1140                 }
1141
1142                 foreach ($tags as $tag) {
1143                         if ($tag['type'] == Tag::HASHTAG) {
1144                                 XML::addElement($doc, $entry, "category", "", ["term" => $tag['name']]);
1145                         }
1146                 }
1147
1148                 OStatus::getAttachment($doc, $entry, $item);
1149         }
1150
1151         /**
1152          * Fetch or create title for feed entry
1153          *
1154          * @param array $item
1155          * @return string title
1156          */
1157         private static function getTitle(array $item)
1158         {
1159                 if ($item['title'] != '') {
1160                         return BBCode::convert($item['title'], false, BBCode::OSTATUS);
1161                 }
1162
1163                 // Fetch information about the post
1164                 $siteinfo = BBCode::getAttachedData($item["body"]);
1165                 if (isset($siteinfo["title"])) {
1166                         return $siteinfo["title"];
1167                 }
1168
1169                 // If no bookmark is found then take the first line
1170                 // Remove the share element before fetching the first line
1171                 $title = trim(preg_replace("/\[share.*?\](.*?)\[\/share\]/ism","\n$1\n",$item['body']));
1172
1173                 $title = HTML::toPlaintext(BBCode::convert($title, false), 0, true)."\n";
1174                 $pos = strpos($title, "\n");
1175                 $trailer = "";
1176                 if (($pos == 0) || ($pos > 100)) {
1177                         $pos = 100;
1178                         $trailer = "...";
1179                 }
1180
1181                 return substr($title, 0, $pos) . $trailer;
1182         }
1183 }