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\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 " . $importer["uid"]);
  70                 }
  71
  72                 if (empty($xml)) {
  73                         Logger::info('XML is empty.');
  74                         return [];
  75                 }
  76
  77                 if (!empty($contact['poll'])) {
  78                         $basepath = $contact['poll'];
  79                 } elseif (!empty($contact['url'])) {
  80                         $basepath = $contact['url'];
  81                 } else {
  82                         $basepath = '';
  83                 }
  84
  85                 $doc = new DOMDocument();
  86                 @$doc->loadXML(trim($xml));
  87                 $xpath = new DOMXPath($doc);
  88                 $xpath->registerNamespace('atom', ActivityNamespace::ATOM1);
  89                 $xpath->registerNamespace('dc', "http://purl.org/dc/elements/1.1/");
  90                 $xpath->registerNamespace('content', "http://purl.org/rss/1.0/modules/content/");
  91                 $xpath->registerNamespace('rdf', "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
  92                 $xpath->registerNamespace('rss', "http://purl.org/rss/1.0/");
  93                 $xpath->registerNamespace('media', "http://search.yahoo.com/mrss/");
  94                 $xpath->registerNamespace('poco', ActivityNamespace::POCO);
  95
  96                 $author = [];
  97                 $entries = null;
  98
  99                 // Is it RDF?
 100                 if ($xpath->query('/rdf:RDF/rss:channel')->length > 0) {
 101                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:link/text()');
 102                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:title/text()');
 103
 104                         if (empty($author["author-name"])) {
 105                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:description/text()');
 106                         }
 107                         $entries = $xpath->query('/rdf:RDF/rss:item');
 108                 }
 109
 110                 // Is it Atom?
 111                 if ($xpath->query('/atom:feed')->length > 0) {
 112                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']");
 113                         if (is_object($alternate)) {
 114                                 foreach ($alternate AS $attribute) {
 115                                         if ($attribute->name == "href") {
 116                                                 $author["author-link"] = $attribute->textContent;
 117                                         }
 118                                 }
 119                         }
 120
 121                         if (empty($author["author-link"])) {
 122                                 $self = XML::getFirstAttributes($xpath, "atom:link[@rel='self']");
 123                                 if (is_object($self)) {
 124                                         foreach ($self AS $attribute) {
 125                                                 if ($attribute->name == "href") {
 126                                                         $author["author-link"] = $attribute->textContent;
 127                                                 }
 128                                         }
 129                                 }
 130                         }
 131
 132                         if (empty($author["author-link"])) {
 133                                 $author["author-link"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:id/text()');
 134                         }
 135                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:logo/text()');
 136
 137                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:title/text()');
 138
 139                         if (empty($author["author-name"])) {
 140                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:subtitle/text()');
 141                         }
 142
 143                         if (empty($author["author-name"])) {
 144                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:name/text()');
 145                         }
 146
 147                         $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()');
 148                         if ($value != "") {
 149                                 $author["author-name"] = $value;
 150                         }
 151
 152                         if ($dryRun) {
 153                                 $author["author-id"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:id/text()');
 154
 155                                 // See https://tools.ietf.org/html/rfc4287#section-3.2.2
 156                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()');
 157                                 if ($value != "") {
 158                                         $author["author-link"] = $value;
 159                                 }
 160
 161                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()');
 162                                 if ($value != "") {
 163                                         $author["author-nick"] = $value;
 164                                 }
 165
 166                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:address/poco:formatted/text()');
 167                                 if ($value != "") {
 168                                         $author["author-location"] = $value;
 169                                 }
 170
 171                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:note/text()');
 172                                 if ($value != "") {
 173                                         $author["author-about"] = $value;
 174                                 }
 175
 176                                 $avatar = XML::getFirstAttributes($xpath, "atom:author/atom:link[@rel='avatar']");
 177                                 if (is_object($avatar)) {
 178                                         foreach ($avatar AS $attribute) {
 179                                                 if ($attribute->name == "href") {
 180                                                         $author["author-avatar"] = $attribute->textContent;
 181                                                 }
 182                                         }
 183                                 }
 184                         }
 185
 186                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:updated/text()');
 187
 188                         $author["app"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:generator/text()');
 189
 190                         $entries = $xpath->query('/atom:feed/atom:entry');
 191                 }
 192
 193                 // Is it RSS?
 194                 if ($xpath->query('/rss/channel')->length > 0) {
 195                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rss/channel/link/text()');
 196
 197                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/title/text()');
 198                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/rss/channel/image/url/text()');
 199
 200                         if (empty($author["author-name"])) {
 201                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/copyright/text()');
 202                         }
 203
 204                         if (empty($author["author-name"])) {
 205                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/description/text()');
 206                         }
 207
 208                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/rss/channel/pubDate/text()');
 209
 210                         $author["app"] = XML::getFirstNodeValue($xpath, '/rss/channel/generator/text()');
 211
 212                         $entries = $xpath->query('/rss/channel/item');
 213                 }
 214
 215                 if (!$dryRun) {
 216                         $author["author-link"] = $contact["url"];
 217
 218                         if (empty($author["author-name"])) {
 219                                 $author["author-name"] = $contact["name"];
 220                         }
 221
 222                         $author["author-avatar"] = $contact["thumb"];
 223
 224                         $author["owner-link"] = $contact["url"];
 225                         $author["owner-name"] = $contact["name"];
 226                         $author["owner-avatar"] = $contact["thumb"];
 227                 }
 228
 229                 $header = [];
 230                 $header["uid"] = $importer["uid"] ?? 0;
 231                 $header["network"] = Protocol::FEED;
 232                 $header["wall"] = 0;
 233                 $header["origin"] = 0;
 234                 $header["gravity"] = GRAVITY_PARENT;
 235                 $header["private"] = Item::PUBLIC;
 236                 $header["verb"] = Activity::POST;
 237                 $header["object-type"] = Activity\ObjectType::NOTE;
 238                 $header["post-type"] = Item::PT_ARTICLE;
 239
 240                 $header["contact-id"] = $contact["id"] ?? 0;
 241
 242                 if (!is_object($entries)) {
 243                         Logger::info("There are no entries in this feed.");
 244                         return [];
 245                 }
 246
 247                 $items = [];
 248                 $creation_dates = [];
 249
 250                 // Limit the number of items that are about to be fetched
 251                 $total_items = ($entries->length - 1);
 252                 $max_items = DI::config()->get('system', 'max_feed_items');
 253                 if (($max_items > 0) && ($total_items > $max_items)) {
 254                         $total_items = $max_items;
 255                 }
 256
 257                 $postings = [];
 258
 259                 // Importing older entries first
 260                 for ($i = $total_items; $i >= 0; --$i) {
 261                         $entry = $entries->item($i);
 262
 263                         $item = array_merge($header, $author);
 264
 265                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']", $entry);
 266                         if (!is_object($alternate)) {
 267                                 $alternate = XML::getFirstAttributes($xpath, "atom:link", $entry);
 268                         }
 269                         if (is_object($alternate)) {
 270                                 foreach ($alternate AS $attribute) {
 271                                         if ($attribute->name == "href") {
 272                                                 $item["plink"] = $attribute->textContent;
 273                                         }
 274                                 }
 275                         }
 276
 277                         if (empty($item["plink"])) {
 278                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'link/text()', $entry);
 279                         }
 280
 281                         if (empty($item["plink"])) {
 282                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'rss:link/text()', $entry);
 283                         }
 284
 285                         $item["uri"] = XML::getFirstNodeValue($xpath, 'atom:id/text()', $entry);
 286
 287                         if (empty($item["uri"])) {
 288                                 $item["uri"] = XML::getFirstNodeValue($xpath, 'guid/text()', $entry);
 289                         }
 290
 291                         if (empty($item["uri"])) {
 292                                 $item["uri"] = $item["plink"];
 293                         }
 294
 295                         // Add the base path if missing
 296                         $item["uri"] = Network::addBasePath($item["uri"], $basepath);
 297                         $item["plink"] = Network::addBasePath($item["plink"], $basepath);
 298
 299                         $orig_plink = $item["plink"];
 300
 301                         try {
 302                                 $item["plink"] = DI::httpClient()->finalUrl($item["plink"]);
 303                         } catch (TransferException $exception) {
 304                                 Logger::notice('Item URL couldn\'t get expanded', ['url' => $item["plink"], 'exception' => $exception]);
 305                         }
 306
 307                         $item["title"] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
 308
 309                         if (empty($item["title"])) {
 310                                 $item["title"] = XML::getFirstNodeValue($xpath, 'title/text()', $entry);
 311                         }
 312                         if (empty($item["title"])) {
 313                                 $item["title"] = XML::getFirstNodeValue($xpath, 'rss:title/text()', $entry);
 314                         }
 315
 316                         $item["title"] = html_entity_decode($item["title"], ENT_QUOTES, 'UTF-8');
 317
 318                         $published = XML::getFirstNodeValue($xpath, 'atom:published/text()', $entry);
 319
 320                         if (empty($published)) {
 321                                 $published = XML::getFirstNodeValue($xpath, 'pubDate/text()', $entry);
 322                         }
 323
 324                         if (empty($published)) {
 325                                 $published = XML::getFirstNodeValue($xpath, 'dc:date/text()', $entry);
 326                         }
 327
 328                         $updated = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $entry);
 329
 330                         if (empty($updated) && !empty($published)) {
 331                                 $updated = $published;
 332                         }
 333
 334                         if (empty($published) && !empty($updated)) {
 335                                 $published = $updated;
 336                         }
 337
 338                         if ($published != "") {
 339                                 $item["created"] = $published;
 340                         }
 341
 342                         if ($updated != "") {
 343                                 $item["edited"] = $updated;
 344                         }
 345
 346                         if (!$dryRun) {
 347                                 $condition = ["`uid` = ? AND `uri` = ? AND `network` IN (?, ?)",
 348                                         $importer["uid"], $item["uri"], Protocol::FEED, Protocol::DFRN];
 349                                 $previous = Post::selectFirst(['id', 'created'], $condition);
 350                                 if (DBA::isResult($previous)) {
 351                                         // Use the creation date when the post had been stored. It can happen this date changes in the feed.
 352                                         $creation_dates[] = $previous['created'];
 353                                         Logger::info("Item with uri " . $item["uri"] . " for user " . $importer["uid"] . " already existed under id " . $previous["id"]);
 354                                         continue;
 355                                 }
 356                                 $creation_dates[] = DateTimeFormat::utc($item['created']);
 357                         }
 358
 359                         $creator = XML::getFirstNodeValue($xpath, 'author/text()', $entry);
 360
 361                         if (empty($creator)) {
 362                                 $creator = XML::getFirstNodeValue($xpath, 'atom:author/atom:name/text()', $entry);
 363                         }
 364
 365                         if (empty($creator)) {
 366                                 $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 367                         }
 368
 369                         if ($creator != "") {
 370                                 $item["author-name"] = $creator;
 371                         }
 372
 373                         $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 374
 375                         if ($creator != "") {
 376                                 $item["author-name"] = $creator;
 377                         }
 378
 379                         /// @TODO ?
 380                         // <category>Ausland</category>
 381                         // <media:thumbnail width="152" height="76" url="http://www.taz.de/picture/667875/192/14388767.jpg"/>
 382
 383                         $attachments = [];
 384
 385                         $enclosures = $xpath->query("enclosure|atom:link[@rel='enclosure']", $entry);
 386                         foreach ($enclosures AS $enclosure) {
 387                                 $href = "";
 388                                 $length = null;
 389                                 $type = null;
 390
 391                                 foreach ($enclosure->attributes AS $attribute) {
 392                                         if (in_array($attribute->name, ["url", "href"])) {
 393                                                 $href = $attribute->textContent;
 394                                         } elseif ($attribute->name == "length") {
 395                                                 $length = (int)$attribute->textContent;
 396                                         } elseif ($attribute->name == "type") {
 397                                                 $type = $attribute->textContent;
 398                                         }
 399                                 }
 400
 401                                 if (!empty($href)) {
 402                                         $attachments[] = ['type' => Post\Media::DOCUMENT, 'url' => $href, 'mimetype' => $type, 'size' => $length];
 403                                 }
 404                         }
 405
 406                         $taglist = [];
 407                         $categories = $xpath->query("category", $entry);
 408                         foreach ($categories AS $category) {
 409                                 $taglist[] = $category->nodeValue;
 410                         }
 411
 412                         $body = trim(XML::getFirstNodeValue($xpath, 'atom:content/text()', $entry));
 413
 414                         if (empty($body)) {
 415                                 $body = trim(XML::getFirstNodeValue($xpath, 'content:encoded/text()', $entry));
 416                         }
 417
 418                         $summary = trim(XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry));
 419
 420                         if (empty($summary)) {
 421                                 $summary = trim(XML::getFirstNodeValue($xpath, 'description/text()', $entry));
 422                         }
 423
 424                         if (empty($body)) {
 425                                 $body = $summary;
 426                                 $summary = '';
 427                         }
 428
 429                         if ($body == $summary) {
 430                                 $summary = '';
 431                         }
 432
 433                         // remove the content of the title if it is identically to the body
 434                         // This helps with auto generated titles e.g. from tumblr
 435                         if (self::titleIsBody($item["title"], $body)) {
 436                                 $item["title"] = "";
 437                         }
 438                         $item["body"] = HTML::toBBCode($body, $basepath);
 439
 440                         // Remove tracking pixels
 441                         $item["body"] = preg_replace("/\[img=1x1\]([^\[\]]*)\[\/img\]/Usi", '', $item["body"]);
 442
 443                         if (($item["body"] == '') && ($item["title"] != '')) {
 444                                 $item["body"] = $item["title"];
 445                                 $item["title"] = '';
 446                         }
 447
 448                         if ($dryRun) {
 449                                 $items[] = $item;
 450                                 break;
 451                         } elseif (!Item::isValid($item)) {
 452                                 Logger::info('Feed item is invalid', ['created' => $item['created'], 'uid' => $item['uid'], 'uri' => $item['uri']]);
 453                                 continue;
 454                         } elseif (Item::isTooOld($item)) {
 455                                 Logger::info('Feed is too old', ['created' => $item['created'], 'uid' => $item['uid'], 'uri' => $item['uri']]);
 456                                 continue;
 457                         }
 458
 459                         $preview = '';
 460                         if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] < 3)) {
 461                                 // Handle enclosures and treat them as preview picture
 462                                 foreach ($attachments AS $attachment) {
 463                                         if ($attachment["mimetype"] == "image/jpeg") {
 464                                                 $preview = $attachment["url"];
 465                                         }
 466                                 }
 467
 468                                 // Remove a possible link to the item itself
 469                                 $item["body"] = str_replace($item["plink"], '', $item["body"]);
 470                                 $item["body"] = trim(preg_replace('/\[url\=\](\w+.*?)\[\/url\]/i', '', $item["body"]));
 471
 472                                 // Replace the content when the title is longer than the body
 473                                 $replace = (strlen($item["title"]) > strlen($item["body"]));
 474
 475                                 // Replace it, when there is an image in the body
 476                                 if (strstr($item["body"], '[/img]')) {
 477                                         $replace = true;
 478                                 }
 479
 480                                 // Replace it, when there is a link in the body
 481                                 if (strstr($item["body"], '[/url]')) {
 482                                         $replace = true;
 483                                 }
 484
 485                                 $saved_body = $item["body"];
 486                                 $saved_title = $item["title"];
 487
 488                                 if ($replace) {
 489                                         $item["body"] = trim($item["title"]);
 490                                 }
 491
 492                                 $data = ParseUrl::getSiteinfoCached($item['plink']);
 493                                 if (!empty($data['text']) && !empty($data['title']) && (mb_strlen($item['body']) < mb_strlen($data['text']))) {
 494                                         // When the fetched page info text is longer than the body, we do try to enhance the body
 495                                         if (!empty($item['body']) && (strpos($data['title'], $item['body']) === false) && (strpos($data['text'], $item['body']) === false)) {
 496                                                 // The body is not part of the fetched page info title or page info text. So we add the text to the body
 497                                                 $item['body'] .= "\n\n" . $data['text'];
 498                                         } else {
 499                                                 // Else we replace the body with the page info text
 500                                                 $item['body'] = $data['text'];
 501                                         }
 502                                 }
 503
 504                                 $data = PageInfo::queryUrl($item["plink"], false, $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_denylist"] ?? '');
 505
 506                                 if (!empty($data)) {
 507                                         // Take the data that was provided by the feed if the query is empty
 508                                         if (($data['type'] == 'link') && empty($data['title']) && empty($data['text'])) {
 509                                                 $data['title'] = $saved_title;
 510                                                 $item["body"] = $saved_body;
 511                                         }
 512
 513                                         $data_text = strip_tags(trim($data['text'] ?? ''));
 514                                         $item_body = strip_tags(trim($item['body'] ?? ''));
 515
 516                                         if (!empty($data_text) && (($data_text == $item_body) || strstr($item_body, $data_text))) {
 517                                                 $data['text'] = '';
 518                                         }
 519
 520                                         // We always strip the title since it will be added in the page information
 521                                         $item["title"] = "";
 522                                         $item["body"] = $item["body"] . "\n" . PageInfo::getFooterFromData($data, false);
 523                                         $taglist = $contact["fetch_further_information"] == 2 ? PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"] ?? '') : [];
 524                                         $item["object-type"] = Activity\ObjectType::BOOKMARK;
 525                                         $attachments = [];
 526                                 }
 527                         } else {
 528                                 if (!empty($summary)) {
 529                                         $item["body"] = '[abstract]' . HTML::toBBCode($summary, $basepath) . "[/abstract]\n" . $item["body"];
 530                                 }
 531
 532                                 if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] == 3)) {
 533                                         if (empty($taglist)) {
 534                                                 $taglist = PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"] ?? '');
 535                                         }
 536                                         $item["body"] .= "\n" . self::tagToString($taglist);
 537                                 } else {
 538                                         $taglist = [];
 539                                 }
 540
 541                                 // Add the link to the original feed entry if not present in feed
 542                                 if (($item['plink'] != '') && !strstr($item["body"], $item['plink'])) {
 543                                         $item["body"] .= "[hr][url]" . $item['plink'] . "[/url]";
 544                                 }
 545                         }
 546
 547                         if (empty($item['title'])) {
 548                                 $item['post-type'] = Item::PT_NOTE;
 549                         }
 550
 551                         Logger::info('Stored feed', ['item' => $item]);
 552
 553                         $notify = Item::isRemoteSelf($contact, $item);
 554
 555                         // Distributed items should have a well formatted URI.
 556                         // Additionally we have to avoid conflicts with identical URI between imported feeds and these items.
 557                         if ($notify) {
 558                                 $item['guid'] = Item::guidFromUri($orig_plink, DI::baseUrl()->getHostname());
 559                                 $item['uri'] = Item::newURI($item['uid'], $item['guid']);
 560                                 unset($item['thr-parent']);
 561                                 unset($item['parent-uri']);
 562
 563                                 // Set the delivery priority for "remote self" to "medium"
 564                                 $notify = PRIORITY_MEDIUM;
 565                         }
 566
 567                         $condition = ['uid' => $item['uid'], 'uri' => $item['uri']];
 568                         if (!Post::exists($condition) && !Post\Delayed::exists($item["uri"], $item['uid'])) {
 569                                 if (!$notify) {
 570                                         Post\Delayed::publish($item, $notify, $taglist, $attachments);
 571                                 } else {
 572                                         $postings[] = ['item' => $item, 'notify' => $notify,
 573                                                 'taglist' => $taglist, 'attachments' => $attachments];
 574                                 }
 575                         } else {
 576                                 Logger::info('Post already created or exists in the delayed posts queue', ['uid' => $item['uid'], 'uri' => $item["uri"]]);
 577                         }
 578                 }
 579
 580                 if (!empty($postings)) {
 581                         $min_posting = DI::config()->get('system', 'minimum_posting_interval', 0);
 582                         $total = count($postings);
 583                         if ($total > 1) {
 584                                 // Posts shouldn't be delayed more than a day
 585                                 $interval = min(1440, self::getPollInterval($contact));
 586                                 $delay = max(round(($interval * 60) / $total), 60 * $min_posting);
 587                                 Logger::info('Got posting delay', ['delay' => $delay, 'interval' => $interval, 'items' => $total, 'cid' => $contact['id'], 'url' => $contact['url']]);
 588                         } else {
 589                                 $delay = 0;
 590                         }
 591
 592                         $post_delay = 0;
 593
 594                         foreach ($postings as $posting) {
 595                                 if ($delay > 0) {
 596                                         $publish_time = time() + $post_delay;
 597                                         $post_delay += $delay;
 598                                 } else {
 599                                         $publish_time = time();
 600                                 }
 601
 602                                 $last_publish = DI::pConfig()->get($posting['item']['uid'], 'system', 'last_publish', 0, true);
 603                                 $next_publish = max($last_publish + (60 * $min_posting), time());
 604                                 if ($publish_time < $next_publish) {
 605                                         $publish_time = $next_publish;
 606                                 }
 607                                 $publish_at = date(DateTimeFormat::MYSQL, $publish_time);
 608
 609                                 if (Post\Delayed::add($posting['item']['uri'], $posting['item'], $posting['notify'], Post\Delayed::PREPARED, $publish_at, $posting['taglist'], $posting['attachments'])) {
 610                                         DI::pConfig()->set($item['uid'], 'system', 'last_publish', $publish_time);
 611                                 }
 612                         }
 613                 }
 614
 615                 if (!$dryRun && DI::config()->get('system', 'adjust_poll_frequency')) {
 616                         self::adjustPollFrequency($contact, $creation_dates);
 617                 }
 618
 619                 return ["header" => $author, "items" => $items];
 620         }
 621
 622         /**
 623          * Automatically adjust the poll frequency according to the post frequency
 624          *
 625          * @param array $contact
 626          * @param array $creation_dates
 627          * @return void
 628          */
 629         private static function adjustPollFrequency(array $contact, array $creation_dates)
 630         {
 631                 if ($contact['network'] != Protocol::FEED) {
 632                         Logger::info('Contact is no feed, skip.', ['id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url'], 'network' => $contact['network']]);
 633                         return;
 634                 }
 635
 636                 if (!empty($creation_dates)) {
 637                         // Count the post frequency and the earliest and latest post date
 638                         $frequency = [];
 639                         $oldest = time();
 640                         $newest = 0;
 641                         $oldest_date = $newest_date = '';
 642
 643                         foreach ($creation_dates as $date) {
 644                                 $timestamp = strtotime($date);
 645                                 $day = intdiv($timestamp, 86400);
 646                                 $hour = $timestamp % 86400;
 647
 648                                 // Only have a look at values from the last seven days
 649                                 if (((time() / 86400) - $day) < 7) {
 650                                         if (empty($frequency[$day])) {
 651                                                 $frequency[$day] = ['count' => 1, 'low' => $hour, 'high' => $hour];
 652                                         } else {
 653                                                 ++$frequency[$day]['count'];
 654                                                 if ($frequency[$day]['low'] > $hour) {
 655                                                         $frequency[$day]['low'] = $hour;
 656                                                 }
 657                                                 if ($frequency[$day]['high'] < $hour) {
 658                                                         $frequency[$day]['high'] = $hour;
 659                                                 }
 660                                         }
 661                                 }
 662                                 if ($oldest > $day) {
 663                                         $oldest = $day;
 664                                         $oldest_date = $date;
 665                                 }
 666
 667                                 if ($newest < $day) {
 668                                         $newest = $day;
 669                                         $newest_date = $date;
 670                                 }
 671                         }
 672
 673                         if (count($creation_dates) == 1) {
 674                                 Logger::info('Feed had posted a single time, switching to daily polling', ['newest' => $newest_date, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 675                                 $priority = 8; // Poll once a day
 676                         }
 677
 678                         if (empty($priority) && (((time() / 86400) - $newest) > 730)) {
 679                                 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']]);
 680                                 $priority = 10; // Poll every month
 681                         }
 682
 683                         if (empty($priority) && (((time() / 86400) - $newest) > 365)) {
 684                                 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']]);
 685                                 $priority = 9; // Poll every week
 686                         }
 687
 688                         if (empty($priority) && empty($frequency)) {
 689                                 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']]);
 690                                 $priority = 8; // Poll once a day
 691                         }
 692
 693                         if (empty($priority)) {
 694                                 // Calculate the highest "posts per day" value
 695                                 $max = 0;
 696                                 foreach ($frequency as $entry) {
 697                                         if (($entry['count'] == 1) || ($entry['high'] == $entry['low'])) {
 698                                                 continue;
 699                                         }
 700
 701                                         // We take the earliest and latest post day and interpolate the number of post per day
 702                                         // that would had been created with this post frequency
 703
 704                                         // Assume at least four hours between oldest and newest post per day - should be okay for news outlets
 705                                         $duration = max($entry['high'] - $entry['low'], 14400);
 706                                         $ppd = (86400 / $duration) * $entry['count'];
 707                                         if ($ppd > $max) {
 708                                                 $max = $ppd;
 709                                         }
 710                                 }
 711                                 if ($max > 48) {
 712                                         $priority = 1; // Poll every quarter hour
 713                                 } elseif ($max > 24) {
 714                                         $priority = 2; // Poll half an hour
 715                                 } elseif ($max > 12) {
 716                                         $priority = 3; // Poll hourly
 717                                 } elseif ($max > 8) {
 718                                         $priority = 4; // Poll every two hours
 719                                 } elseif ($max > 4) {
 720                                         $priority = 5; // Poll every three hours
 721                                 } elseif ($max > 2) {
 722                                         $priority = 6; // Poll every six hours
 723                                 } else {
 724                                         $priority = 7; // Poll twice a day
 725                                 }
 726                                 Logger::info('Calculated priority by the posts per day', ['priority' => $priority, 'max' => round($max, 2), 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 727                         }
 728                 } else {
 729                         Logger::info('No posts, switching to daily polling', ['id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 730                         $priority = 8; // Poll once a day
 731                 }
 732
 733                 if ($contact['rating'] != $priority) {
 734                         Logger::notice('Adjusting priority', ['old' => $contact['rating'], 'new' => $priority, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 735                         DBA::update('contact', ['rating' => $priority], ['id' => $contact['id']]);
 736                 }
 737         }
 738
 739         /**
 740          * Get the poll interval for the given contact array
 741          *
 742          * @param array $contact
 743          * @return int Poll interval in minutes
 744          */
 745         public static function getPollInterval(array $contact)
 746         {
 747                 if (in_array($contact['network'], [Protocol::MAIL, Protocol::FEED])) {
 748                         $ratings = [0, 3, 7, 8, 9, 10];
 749                         if (DI::config()->get('system', 'adjust_poll_frequency') && ($contact['network'] == Protocol::FEED)) {
 750                                 $rating = $contact['rating'];
 751                         } elseif (array_key_exists($contact['priority'], $ratings)) {
 752                                 $rating = $ratings[$contact['priority']];
 753                         } else {
 754                                 $rating = -1;
 755                         }
 756                 } else {
 757                         // Check once a week per default for all other networks
 758                         $rating = 9;
 759                 }
 760
 761                 // Friendica and OStatus are checked once a day
 762                 if (in_array($contact['network'], [Protocol::DFRN, Protocol::OSTATUS])) {
 763                         $rating = 8;
 764                 }
 765
 766                 // Check archived contacts or contacts with unsupported protocols once a month
 767                 if ($contact['archive'] || in_array($contact['network'], [Protocol::ZOT, Protocol::PHANTOM])) {
 768                         $rating = 10;
 769                 }
 770
 771                 if ($rating < 0) {
 772                         return 0;
 773                 }
 774                 /*
 775                  * Based on $contact['priority'], should we poll this site now? Or later?
 776                  */
 777
 778                 $min_poll_interval = max(1, DI::config()->get('system', 'min_poll_interval'));
 779
 780                 $poll_intervals = [$min_poll_interval, 15, 30, 60, 120, 180, 360, 720 ,1440, 10080, 43200];
 781
 782                 //$poll_intervals = [$min_poll_interval . ' minute', '15 minute', '30 minute',
 783                 //      '1 hour', '2 hour', '3 hour', '6 hour', '12 hour' ,'1 day', '1 week', '1 month'];
 784
 785                 return $poll_intervals[$rating];
 786         }
 787
 788         /**
 789          * Convert a tag array to a tag string
 790          *
 791          * @param array $tags
 792          * @return string tag string
 793          */
 794         private static function tagToString(array $tags)
 795         {
 796                 $tagstr = '';
 797
 798                 foreach ($tags as $tag) {
 799                         if ($tagstr != "") {
 800                                 $tagstr .= ", ";
 801                         }
 802
 803                         $tagstr .= "#[url=" . DI::baseUrl() . "/search?tag=" . urlencode($tag) . "]" . $tag . "[/url]";
 804                 }
 805
 806                 return $tagstr;
 807         }
 808
 809         private static function titleIsBody($title, $body)
 810         {
 811                 $title = strip_tags($title);
 812                 $title = trim($title);
 813                 $title = html_entity_decode($title, ENT_QUOTES, 'UTF-8');
 814                 $title = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $title);
 815
 816                 $body = strip_tags($body);
 817                 $body = trim($body);
 818                 $body = html_entity_decode($body, ENT_QUOTES, 'UTF-8');
 819                 $body = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $body);
 820
 821                 if (strlen($title) < strlen($body)) {
 822                         $body = substr($body, 0, strlen($title));
 823                 }
 824
 825                 if (($title != $body) && (substr($title, -3) == "...")) {
 826                         $pos = strrpos($title, "...");
 827                         if ($pos > 0) {
 828                                 $title = substr($title, 0, $pos);
 829                                 $body = substr($body, 0, $pos);
 830                         }
 831                 }
 832                 return ($title == $body);
 833         }
 834
 835         /**
 836          * Creates the Atom feed for a given nickname
 837          *
 838          * Supported filters:
 839          * - activity (default): all the public posts
 840          * - posts: all the public top-level posts
 841          * - comments: all the public replies
 842          *
 843          * Updates the provided last_update parameter if the result comes from the
 844          * cache or it is empty
 845          *
 846          * @param string  $owner_nick  Nickname of the feed owner
 847          * @param string  $last_update Date of the last update
 848          * @param integer $max_items   Number of maximum items to fetch
 849          * @param string  $filter      Feed items filter (activity, posts or comments)
 850          * @param boolean $nocache     Wether to bypass caching
 851          *
 852          * @return string Atom feed
 853          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 854          * @throws \ImagickException
 855          */
 856         public static function atom($owner_nick, $last_update, $max_items = 300, $filter = 'activity', $nocache = false)
 857         {
 858                 $stamp = microtime(true);
 859
 860                 $owner = User::getOwnerDataByNick($owner_nick);
 861                 if (!$owner) {
 862                         return;
 863                 }
 864
 865                 $cachekey = "feed:feed:" . $owner_nick . ":" . $filter . ":" . $last_update;
 866
 867                 $previous_created = $last_update;
 868
 869                 // Don't cache when the last item was posted less then 15 minutes ago (Cache duration)
 870                 if ((time() - strtotime($owner['last-item'])) < 15*60) {
 871                         $result = DI::cache()->get($cachekey);
 872                         if (!$nocache && !is_null($result)) {
 873                                 Logger::info('Cached feed duration', ['seconds' => number_format(microtime(true) - $stamp, 3), 'nick' => $owner_nick, 'filter' => $filter, 'created' => $previous_created]);
 874                                 return $result['feed'];
 875                         }
 876                 }
 877
 878                 $check_date = empty($last_update) ? '' : DateTimeFormat::utc($last_update);
 879                 $authorid = Contact::getIdForURL($owner["url"]);
 880
 881                 $condition = ["`uid` = ? AND `received` > ? AND NOT `deleted` AND `gravity` IN (?, ?)
 882                         AND `private` != ? AND `visible` AND `wall` AND `parent-network` IN (?, ?, ?, ?)",
 883                         $owner["uid"], $check_date, GRAVITY_PARENT, GRAVITY_COMMENT,
 884                         Item::PRIVATE, Protocol::ACTIVITYPUB,
 885                         Protocol::OSTATUS, Protocol::DFRN, Protocol::DIASPORA];
 886
 887                 if ($filter === 'comments') {
 888                         $condition[0] .= " AND `gravity` = ? ";
 889                         $condition[] = GRAVITY_COMMENT;
 890                 }
 891
 892                 if ($owner['account-type'] != User::ACCOUNT_TYPE_COMMUNITY) {
 893                         $condition[0] .= " AND `contact-id` = ? AND `author-id` = ?";
 894                         $condition[] = $owner["id"];
 895                         $condition[] = $authorid;
 896                 }
 897
 898                 $params = ['order' => ['received' => true], 'limit' => $max_items];
 899
 900                 if ($filter === 'posts') {
 901                         $ret = Post::selectThread(Item::DELIVER_FIELDLIST, $condition, $params);
 902                 } else {
 903                         $ret = Post::select(Item::DELIVER_FIELDLIST, $condition, $params);
 904                 }
 905
 906                 $items = Post::toArray($ret);
 907
 908                 $doc = new DOMDocument('1.0', 'utf-8');
 909                 $doc->formatOutput = true;
 910
 911                 $root = self::addHeader($doc, $owner, $filter);
 912
 913                 foreach ($items as $item) {
 914                         $entry = self::entry($doc, $item, $owner);
 915                         $root->appendChild($entry);
 916
 917                         if ($last_update < $item['created']) {
 918                                 $last_update = $item['created'];
 919                         }
 920                 }
 921
 922                 $feeddata = trim($doc->saveXML());
 923
 924                 $msg = ['feed' => $feeddata, 'last_update' => $last_update];
 925                 DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
 926
 927                 Logger::info('Feed duration', ['seconds' => number_format(microtime(true) - $stamp, 3), 'nick' => $owner_nick, 'filter' => $filter, 'created' => $previous_created]);
 928
 929                 return $feeddata;
 930         }
 931
 932         /**
 933          * Adds the header elements to the XML document
 934          *
 935          * @param DOMDocument $doc       XML document
 936          * @param array       $owner     Contact data of the poster
 937          * @param string      $filter    The related feed filter (activity, posts or comments)
 938          *
 939          * @return object header root element
 940          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 941          */
 942         private static function addHeader(DOMDocument $doc, array $owner, $filter)
 943         {
 944                 $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 945                 $doc->appendChild($root);
 946
 947                 $title = '';
 948                 $selfUri = '/feed/' . $owner["nick"] . '/';
 949                 switch ($filter) {
 950                         case 'activity':
 951                                 $title = DI::l10n()->t('%s\'s timeline', $owner['name']);
 952                                 $selfUri .= $filter;
 953                                 break;
 954                         case 'posts':
 955                                 $title = DI::l10n()->t('%s\'s posts', $owner['name']);
 956                                 break;
 957                         case 'comments':
 958                                 $title = DI::l10n()->t('%s\'s comments', $owner['name']);
 959                                 $selfUri .= $filter;
 960                                 break;
 961                 }
 962
 963                 $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION . "-" . DB_UPDATE_VERSION];
 964                 XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
 965                 XML::addElement($doc, $root, "id", DI::baseUrl() . "/profile/" . $owner["nick"]);
 966                 XML::addElement($doc, $root, "title", $title);
 967                 XML::addElement($doc, $root, "subtitle", sprintf("Updates from %s on %s", $owner["name"], DI::config()->get('config', 'sitename')));
 968                 XML::addElement($doc, $root, "logo", Contact::getAvatarUrlForId($owner['id'], Proxy::SIZE_SMALL, $owner['updated']));
 969                 XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
 970
 971                 $author = self::addAuthor($doc, $owner);
 972                 $root->appendChild($author);
 973
 974                 $attributes = ["href" => $owner["url"], "rel" => "alternate", "type" => "text/html"];
 975                 XML::addElement($doc, $root, "link", "", $attributes);
 976
 977                 OStatus::hublinks($doc, $root, $owner["nick"]);
 978
 979                 $attributes = ["href" => DI::baseUrl() . $selfUri, "rel" => "self", "type" => "application/atom+xml"];
 980                 XML::addElement($doc, $root, "link", "", $attributes);
 981
 982                 return $root;
 983         }
 984
 985         /**
 986          * Adds the author element to the XML document
 987          *
 988          * @param DOMDocument $doc          XML document
 989          * @param array       $owner        Contact data of the poster
 990          *
 991          * @return \DOMElement author element
 992          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 993          */
 994         private static function addAuthor(DOMDocument $doc, array $owner)
 995         {
 996                 $author = $doc->createElement("author");
 997                 XML::addElement($doc, $author, "uri", $owner["url"]);
 998                 XML::addElement($doc, $author, "name", $owner["nick"]);
 999                 XML::addElement($doc, $author, "email", $owner["addr"]);
1000
1001                 return $author;
1002         }
1003
1004         /**
1005          * Adds an entry element to the XML document
1006          *
1007          * @param DOMDocument $doc       XML document
1008          * @param array       $item      Data of the item that is to be posted
1009          * @param array       $owner     Contact data of the poster
1010          * @param bool        $toplevel  optional default false
1011          *
1012          * @return \DOMElement Entry element
1013          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1014          * @throws \ImagickException
1015          */
1016         private static function entry(DOMDocument $doc, array $item, array $owner)
1017         {
1018                 $xml = null;
1019
1020                 $repeated_guid = OStatus::getResharedGuid($item);
1021                 if ($repeated_guid != "") {
1022                         $xml = self::reshareEntry($doc, $item, $owner, $repeated_guid);
1023                 }
1024
1025                 if ($xml) {
1026                         return $xml;
1027                 }
1028
1029                 return self::noteEntry($doc, $item, $owner);
1030         }
1031
1032                 /**
1033          * Adds an entry element with reshared content
1034          *
1035          * @param DOMDocument $doc           XML document
1036          * @param array       $item          Data of the item that is to be posted
1037          * @param array       $owner         Contact data of the poster
1038          * @param string      $repeated_guid guid
1039          * @param bool        $toplevel      Is it for en entry element (false) or a feed entry (true)?
1040          *
1041          * @return bool Entry element
1042          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1043          * @throws \ImagickException
1044          */
1045         private static function reshareEntry(DOMDocument $doc, array $item, array $owner, $repeated_guid)
1046         {
1047                 if (($item['gravity'] != GRAVITY_PARENT) && (Strings::normaliseLink($item["author-link"]) != Strings::normaliseLink($owner["url"]))) {
1048                         Logger::info('Feed entry author does not match feed owner', ['owner' => $owner["url"], 'author' => $item["author-link"]]);
1049                 }
1050
1051                 $entry = OStatus::entryHeader($doc, $owner, $item, false);
1052
1053                 $condition = ['uid' => $owner["uid"], 'guid' => $repeated_guid, 'private' => [Item::PUBLIC, Item::UNLISTED],
1054                         'network' => Protocol::FEDERATED];
1055                 $repeated_item = Post::selectFirst(Item::DELIVER_FIELDLIST, $condition);
1056                 if (!DBA::isResult($repeated_item)) {
1057                         return false;
1058                 }
1059
1060                 self::entryContent($doc, $entry, $item, self::getTitle($repeated_item), Activity::SHARE, false);
1061
1062                 self::entryFooter($doc, $entry, $item, $owner);
1063
1064                 return $entry;
1065         }
1066
1067         /**
1068          * Adds a regular entry element
1069          *
1070          * @param DOMDocument $doc       XML document
1071          * @param array       $item      Data of the item that is to be posted
1072          * @param array       $owner     Contact data of the poster
1073          * @param bool        $toplevel  Is it for en entry element (false) or a feed entry (true)?
1074          *
1075          * @return \DOMElement Entry element
1076          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1077          * @throws \ImagickException
1078          */
1079         private static function noteEntry(DOMDocument $doc, array $item, array $owner)
1080         {
1081                 if (($item['gravity'] != GRAVITY_PARENT) && (Strings::normaliseLink($item["author-link"]) != Strings::normaliseLink($owner["url"]))) {
1082                         Logger::info('Feed entry author does not match feed owner', ['owner' => $owner["url"], 'author' => $item["author-link"]]);
1083                 }
1084
1085                 $entry = OStatus::entryHeader($doc, $owner, $item, false);
1086
1087                 self::entryContent($doc, $entry, $item, self::getTitle($item), '', true);
1088
1089                 self::entryFooter($doc, $entry, $item, $owner);
1090
1091                 return $entry;
1092         }
1093
1094         /**
1095          * Adds elements to the XML document
1096          *
1097          * @param DOMDocument $doc       XML document
1098          * @param \DOMElement $entry     Entry element where the content is 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 string      $title     Title for the post
1102          * @param string      $verb      The activity verb
1103          * @param bool        $complete  Add the "status_net" element?
1104          * @param bool        $feed_mode Behave like a regular feed for users if true
1105          * @return void
1106          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1107          */
1108         private static function entryContent(DOMDocument $doc, \DOMElement $entry, array $item, $title, $verb = "", $complete = true)
1109         {
1110                 if ($verb == "") {
1111                         $verb = OStatus::constructVerb($item);
1112                 }
1113
1114                 XML::addElement($doc, $entry, "id", $item["uri"]);
1115                 XML::addElement($doc, $entry, "title", html_entity_decode($title, ENT_QUOTES, 'UTF-8'));
1116
1117                 $body = OStatus::formatPicturePost($item['body'], $item['uri-id']);
1118
1119                 $body = BBCode::convertForUriId($item['uri-id'], $body, BBCode::ACTIVITYPUB);
1120
1121                 XML::addElement($doc, $entry, "content", $body, ["type" => "html"]);
1122
1123                 XML::addElement($doc, $entry, "link", "", ["rel" => "alternate", "type" => "text/html",
1124                                                                 "href" => DI::baseUrl()."/display/".$item["guid"]]
1125                 );
1126
1127                 XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM));
1128                 XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM));
1129         }
1130
1131         /**
1132          * Adds the elements at the foot of an entry to the XML document
1133          *
1134          * @param DOMDocument $doc       XML document
1135          * @param object      $entry     The entry element where the elements are added
1136          * @param array       $item      Data of the item that is to be posted
1137          * @param array       $owner     Contact data of the poster
1138          * @param bool        $complete  default true
1139          * @return void
1140          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1141          */
1142         private static function entryFooter(DOMDocument $doc, $entry, array $item, array $owner)
1143         {
1144                 $mentioned = [];
1145
1146                 if ($item['gravity'] != GRAVITY_PARENT) {
1147                         $parent = Post::selectFirst(['guid', 'author-link', 'owner-link'], ['id' => $item['parent']]);
1148
1149                         $thrparent = Post::selectFirst(['guid', 'author-link', 'owner-link', 'plink'], ['uid' => $owner["uid"], 'uri' => $item['thr-parent']]);
1150
1151                         if (DBA::isResult($thrparent)) {
1152                                 $mentioned[$thrparent["author-link"]] = $thrparent["author-link"];
1153                                 $mentioned[$thrparent["owner-link"]] = $thrparent["owner-link"];
1154                                 $parent_plink = $thrparent["plink"];
1155                         } else {
1156                                 $mentioned[$parent["author-link"]] = $parent["author-link"];
1157                                 $mentioned[$parent["owner-link"]] = $parent["owner-link"];
1158                                 $parent_plink = DI::baseUrl()."/display/".$parent["guid"];
1159                         }
1160
1161                         $attributes = [
1162                                         "ref" => $item['thr-parent'],
1163                                         "href" => $parent_plink];
1164                         XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
1165
1166                         $attributes = [
1167                                         "rel" => "related",
1168                                         "href" => $parent_plink];
1169                         XML::addElement($doc, $entry, "link", "", $attributes);
1170                 }
1171
1172                 // uri-id isn't present for follow entry pseudo-items
1173                 $tags = Tag::getByURIId($item['uri-id'] ?? 0);
1174                 foreach ($tags as $tag) {
1175                         $mentioned[$tag['url']] = $tag['url'];
1176                 }
1177
1178                 foreach ($tags as $tag) {
1179                         if ($tag['type'] == Tag::HASHTAG) {
1180                                 XML::addElement($doc, $entry, "category", "", ["term" => $tag['name']]);
1181                         }
1182                 }
1183
1184                 OStatus::getAttachment($doc, $entry, $item);
1185         }
1186
1187         /**
1188          * Fetch or create title for feed entry
1189          *
1190          * @param array $item
1191          * @return string title
1192          */
1193         private static function getTitle(array $item)
1194         {
1195                 if ($item['title'] != '') {
1196                         return BBCode::convertForUriId($item['uri-id'], $item['title'], BBCode::ACTIVITYPUB);
1197                 }
1198
1199                 // Fetch information about the post
1200                 $siteinfo = BBCode::getAttachedData($item["body"]);
1201                 if (isset($siteinfo["title"])) {
1202                         return $siteinfo["title"];
1203                 }
1204
1205                 // If no bookmark is found then take the first line
1206                 // Remove the share element before fetching the first line
1207                 $title = trim(preg_replace("/\[share.*?\](.*?)\[\/share\]/ism","\n$1\n",$item['body']));
1208
1209                 $title = BBCode::toPlaintext($title)."\n";
1210                 $pos = strpos($title, "\n");
1211                 $trailer = "";
1212                 if (($pos == 0) || ($pos > 100)) {
1213                         $pos = 100;
1214                         $trailer = "...";
1215                 }
1216
1217                 return substr($title, 0, $pos) . $trailer;
1218         }
1219 }