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
  46 /**
  47  * This class contain functions to import feeds (RSS/RDF/Atom)
  48  */
  49 class Feed
  50 {
  51         /**
  52          * Read a RSS/RDF/Atom feed and create an item entry for it
  53          *
  54          * @param string $xml      The feed data
  55          * @param array  $importer The user record of the importer
  56          * @param array  $contact  The contact record of the feed
  57          *
  58          * @return array Returns the header and the first item in dry run mode
  59          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  60          */
  61         public static function import($xml, array $importer = [], array $contact = [])
  62         {
  63                 $dryRun = empty($importer) && empty($contact);
  64
  65                 if ($dryRun) {
  66                         Logger::info("Test Atom/RSS feed");
  67                 } else {
  68                         Logger::info("Import Atom/RSS feed '" . $contact["name"] . "' (Contact " . $contact["id"] . ") for user " . $importer["uid"]);
  69                 }
  70
  71                 if (empty($xml)) {
  72                         Logger::info('XML is empty.');
  73                         return [];
  74                 }
  75
  76                 if (!empty($contact['poll'])) {
  77                         $basepath = $contact['poll'];
  78                 } elseif (!empty($contact['url'])) {
  79                         $basepath = $contact['url'];
  80                 } else {
  81                         $basepath = '';
  82                 }
  83
  84                 $doc = new DOMDocument();
  85                 @$doc->loadXML(trim($xml));
  86                 $xpath = new DOMXPath($doc);
  87                 $xpath->registerNamespace('atom', ActivityNamespace::ATOM1);
  88                 $xpath->registerNamespace('dc', "http://purl.org/dc/elements/1.1/");
  89                 $xpath->registerNamespace('content', "http://purl.org/rss/1.0/modules/content/");
  90                 $xpath->registerNamespace('rdf', "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
  91                 $xpath->registerNamespace('rss', "http://purl.org/rss/1.0/");
  92                 $xpath->registerNamespace('media', "http://search.yahoo.com/mrss/");
  93                 $xpath->registerNamespace('poco', ActivityNamespace::POCO);
  94
  95                 $author = [];
  96                 $entries = null;
  97
  98                 // Is it RDF?
  99                 if ($xpath->query('/rdf:RDF/rss:channel')->length > 0) {
 100                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:link/text()');
 101                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:title/text()');
 102
 103                         if (empty($author["author-name"])) {
 104                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:description/text()');
 105                         }
 106                         $entries = $xpath->query('/rdf:RDF/rss:item');
 107                 }
 108
 109                 // Is it Atom?
 110                 if ($xpath->query('/atom:feed')->length > 0) {
 111                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']");
 112                         if (is_object($alternate)) {
 113                                 foreach ($alternate AS $attribute) {
 114                                         if ($attribute->name == "href") {
 115                                                 $author["author-link"] = $attribute->textContent;
 116                                         }
 117                                 }
 118                         }
 119
 120                         if (empty($author["author-link"])) {
 121                                 $self = XML::getFirstAttributes($xpath, "atom:link[@rel='self']");
 122                                 if (is_object($self)) {
 123                                         foreach ($self AS $attribute) {
 124                                                 if ($attribute->name == "href") {
 125                                                         $author["author-link"] = $attribute->textContent;
 126                                                 }
 127                                         }
 128                                 }
 129                         }
 130
 131                         if (empty($author["author-link"])) {
 132                                 $author["author-link"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:id/text()');
 133                         }
 134                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:logo/text()');
 135
 136                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:title/text()');
 137
 138                         if (empty($author["author-name"])) {
 139                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:subtitle/text()');
 140                         }
 141
 142                         if (empty($author["author-name"])) {
 143                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:name/text()');
 144                         }
 145
 146                         $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()');
 147                         if ($value != "") {
 148                                 $author["author-name"] = $value;
 149                         }
 150
 151                         if ($dryRun) {
 152                                 $author["author-id"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:id/text()');
 153
 154                                 // See https://tools.ietf.org/html/rfc4287#section-3.2.2
 155                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()');
 156                                 if ($value != "") {
 157                                         $author["author-link"] = $value;
 158                                 }
 159
 160                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()');
 161                                 if ($value != "") {
 162                                         $author["author-nick"] = $value;
 163                                 }
 164
 165                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:address/poco:formatted/text()');
 166                                 if ($value != "") {
 167                                         $author["author-location"] = $value;
 168                                 }
 169
 170                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:note/text()');
 171                                 if ($value != "") {
 172                                         $author["author-about"] = $value;
 173                                 }
 174
 175                                 $avatar = XML::getFirstAttributes($xpath, "atom:author/atom:link[@rel='avatar']");
 176                                 if (is_object($avatar)) {
 177                                         foreach ($avatar AS $attribute) {
 178                                                 if ($attribute->name == "href") {
 179                                                         $author["author-avatar"] = $attribute->textContent;
 180                                                 }
 181                                         }
 182                                 }
 183                         }
 184
 185                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:updated/text()');
 186
 187                         $author["app"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:generator/text()');
 188
 189                         $entries = $xpath->query('/atom:feed/atom:entry');
 190                 }
 191
 192                 // Is it RSS?
 193                 if ($xpath->query('/rss/channel')->length > 0) {
 194                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rss/channel/link/text()');
 195
 196                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/title/text()');
 197                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/rss/channel/image/url/text()');
 198
 199                         if (empty($author["author-name"])) {
 200                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/copyright/text()');
 201                         }
 202
 203                         if (empty($author["author-name"])) {
 204                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/description/text()');
 205                         }
 206
 207                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/rss/channel/pubDate/text()');
 208
 209                         $author["app"] = XML::getFirstNodeValue($xpath, '/rss/channel/generator/text()');
 210
 211                         $entries = $xpath->query('/rss/channel/item');
 212                 }
 213
 214                 if (!$dryRun) {
 215                         $author["author-link"] = $contact["url"];
 216
 217                         if (empty($author["author-name"])) {
 218                                 $author["author-name"] = $contact["name"];
 219                         }
 220
 221                         $author["author-avatar"] = $contact["thumb"];
 222
 223                         $author["owner-link"] = $contact["url"];
 224                         $author["owner-name"] = $contact["name"];
 225                         $author["owner-avatar"] = $contact["thumb"];
 226                 }
 227
 228                 $header = [];
 229                 $header["uid"] = $importer["uid"] ?? 0;
 230                 $header["network"] = Protocol::FEED;
 231                 $header["wall"] = 0;
 232                 $header["origin"] = 0;
 233                 $header["gravity"] = GRAVITY_PARENT;
 234                 $header["private"] = Item::PUBLIC;
 235                 $header["verb"] = Activity::POST;
 236                 $header["object-type"] = Activity\ObjectType::NOTE;
 237                 $header["post-type"] = Item::PT_ARTICLE;
 238
 239                 $header["contact-id"] = $contact["id"] ?? 0;
 240
 241                 if (!is_object($entries)) {
 242                         Logger::info("There are no entries in this feed.");
 243                         return [];
 244                 }
 245
 246                 $items = [];
 247                 $creation_dates = [];
 248
 249                 // Limit the number of items that are about to be fetched
 250                 $total_items = ($entries->length - 1);
 251                 $max_items = DI::config()->get('system', 'max_feed_items');
 252                 if (($max_items > 0) && ($total_items > $max_items)) {
 253                         $total_items = $max_items;
 254                 }
 255
 256                 $postings = [];
 257
 258                 // Importing older entries first
 259                 for ($i = $total_items; $i >= 0; --$i) {
 260                         $entry = $entries->item($i);
 261
 262                         $item = array_merge($header, $author);
 263
 264                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']", $entry);
 265                         if (!is_object($alternate)) {
 266                                 $alternate = XML::getFirstAttributes($xpath, "atom:link", $entry);
 267                         }
 268                         if (is_object($alternate)) {
 269                                 foreach ($alternate AS $attribute) {
 270                                         if ($attribute->name == "href") {
 271                                                 $item["plink"] = $attribute->textContent;
 272                                         }
 273                                 }
 274                         }
 275
 276                         if (empty($item["plink"])) {
 277                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'link/text()', $entry);
 278                         }
 279
 280                         if (empty($item["plink"])) {
 281                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'rss:link/text()', $entry);
 282                         }
 283
 284                         $item["uri"] = XML::getFirstNodeValue($xpath, 'atom:id/text()', $entry);
 285
 286                         if (empty($item["uri"])) {
 287                                 $item["uri"] = XML::getFirstNodeValue($xpath, 'guid/text()', $entry);
 288                         }
 289
 290                         if (empty($item["uri"])) {
 291                                 $item["uri"] = $item["plink"];
 292                         }
 293
 294                         // Add the base path if missing
 295                         $item["uri"] = Network::addBasePath($item["uri"], $basepath);
 296                         $item["plink"] = Network::addBasePath($item["plink"], $basepath);
 297
 298                         $orig_plink = $item["plink"];
 299
 300                         $item["plink"] = DI::httpClient()->finalUrl($item["plink"]);
 301
 302                         $item["title"] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
 303
 304                         if (empty($item["title"])) {
 305                                 $item["title"] = XML::getFirstNodeValue($xpath, 'title/text()', $entry);
 306                         }
 307                         if (empty($item["title"])) {
 308                                 $item["title"] = XML::getFirstNodeValue($xpath, 'rss:title/text()', $entry);
 309                         }
 310
 311                         $item["title"] = html_entity_decode($item["title"], ENT_QUOTES, 'UTF-8');
 312
 313                         $published = XML::getFirstNodeValue($xpath, 'atom:published/text()', $entry);
 314
 315                         if (empty($published)) {
 316                                 $published = XML::getFirstNodeValue($xpath, 'pubDate/text()', $entry);
 317                         }
 318
 319                         if (empty($published)) {
 320                                 $published = XML::getFirstNodeValue($xpath, 'dc:date/text()', $entry);
 321                         }
 322
 323                         $updated = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $entry);
 324
 325                         if (empty($updated) && !empty($published)) {
 326                                 $updated = $published;
 327                         }
 328
 329                         if (empty($published) && !empty($updated)) {
 330                                 $published = $updated;
 331                         }
 332
 333                         if ($published != "") {
 334                                 $item["created"] = $published;
 335                         }
 336
 337                         if ($updated != "") {
 338                                 $item["edited"] = $updated;
 339                         }
 340
 341                         if (!$dryRun) {
 342                                 $condition = ["`uid` = ? AND `uri` = ? AND `network` IN (?, ?)",
 343                                         $importer["uid"], $item["uri"], Protocol::FEED, Protocol::DFRN];
 344                                 $previous = Post::selectFirst(['id', 'created'], $condition);
 345                                 if (DBA::isResult($previous)) {
 346                                         // Use the creation date when the post had been stored. It can happen this date changes in the feed.
 347                                         $creation_dates[] = $previous['created'];
 348                                         Logger::info("Item with uri " . $item["uri"] . " for user " . $importer["uid"] . " already existed under id " . $previous["id"]);
 349                                         continue;
 350                                 }
 351                                 $creation_dates[] = DateTimeFormat::utc($item['created']);
 352                         }
 353
 354                         $creator = XML::getFirstNodeValue($xpath, 'author/text()', $entry);
 355
 356                         if (empty($creator)) {
 357                                 $creator = XML::getFirstNodeValue($xpath, 'atom:author/atom:name/text()', $entry);
 358                         }
 359
 360                         if (empty($creator)) {
 361                                 $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 362                         }
 363
 364                         if ($creator != "") {
 365                                 $item["author-name"] = $creator;
 366                         }
 367
 368                         $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 369
 370                         if ($creator != "") {
 371                                 $item["author-name"] = $creator;
 372                         }
 373
 374                         /// @TODO ?
 375                         // <category>Ausland</category>
 376                         // <media:thumbnail width="152" height="76" url="http://www.taz.de/picture/667875/192/14388767.jpg"/>
 377
 378                         $attachments = [];
 379
 380                         $enclosures = $xpath->query("enclosure|atom:link[@rel='enclosure']", $entry);
 381                         foreach ($enclosures AS $enclosure) {
 382                                 $href = "";
 383                                 $length = null;
 384                                 $type = null;
 385
 386                                 foreach ($enclosure->attributes AS $attribute) {
 387                                         if (in_array($attribute->name, ["url", "href"])) {
 388                                                 $href = $attribute->textContent;
 389                                         } elseif ($attribute->name == "length") {
 390                                                 $length = (int)$attribute->textContent;
 391                                         } elseif ($attribute->name == "type") {
 392                                                 $type = $attribute->textContent;
 393                                         }
 394                                 }
 395
 396                                 if (!empty($href)) {
 397                                         $attachments[] = ['type' => Post\Media::DOCUMENT, 'url' => $href, 'mimetype' => $type, 'size' => $length];
 398                                 }
 399                         }
 400
 401                         $taglist = [];
 402                         $categories = $xpath->query("category", $entry);
 403                         foreach ($categories AS $category) {
 404                                 $taglist[] = $category->nodeValue;
 405                         }
 406
 407                         $body = trim(XML::getFirstNodeValue($xpath, 'atom:content/text()', $entry));
 408
 409                         if (empty($body)) {
 410                                 $body = trim(XML::getFirstNodeValue($xpath, 'content:encoded/text()', $entry));
 411                         }
 412
 413                         $summary = trim(XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry));
 414
 415                         if (empty($summary)) {
 416                                 $summary = trim(XML::getFirstNodeValue($xpath, 'description/text()', $entry));
 417                         }
 418
 419                         if (empty($body)) {
 420                                 $body = $summary;
 421                                 $summary = '';
 422                         }
 423
 424                         if ($body == $summary) {
 425                                 $summary = '';
 426                         }
 427
 428                         // remove the content of the title if it is identically to the body
 429                         // This helps with auto generated titles e.g. from tumblr
 430                         if (self::titleIsBody($item["title"], $body)) {
 431                                 $item["title"] = "";
 432                         }
 433                         $item["body"] = HTML::toBBCode($body, $basepath);
 434
 435                         // Remove tracking pixels
 436                         $item["body"] = preg_replace("/\[img=1x1\]([^\[\]]*)\[\/img\]/Usi", '', $item["body"]);
 437
 438                         if (($item["body"] == '') && ($item["title"] != '')) {
 439                                 $item["body"] = $item["title"];
 440                                 $item["title"] = '';
 441                         }
 442
 443                         if ($dryRun) {
 444                                 $items[] = $item;
 445                                 break;
 446                         } elseif (!Item::isValid($item)) {
 447                                 Logger::info('Feed item is invalid', ['created' => $item['created'], 'uid' => $item['uid'], 'uri' => $item['uri']]);
 448                                 continue;
 449                         } elseif (Item::isTooOld($item)) {
 450                                 Logger::info('Feed is too old', ['created' => $item['created'], 'uid' => $item['uid'], 'uri' => $item['uri']]);
 451                                 continue;
 452                         }
 453
 454                         $preview = '';
 455                         if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] < 3)) {
 456                                 // Handle enclosures and treat them as preview picture
 457                                 foreach ($attachments AS $attachment) {
 458                                         if ($attachment["mimetype"] == "image/jpeg") {
 459                                                 $preview = $attachment["url"];
 460                                         }
 461                                 }
 462
 463                                 // Remove a possible link to the item itself
 464                                 $item["body"] = str_replace($item["plink"], '', $item["body"]);
 465                                 $item["body"] = trim(preg_replace('/\[url\=\](\w+.*?)\[\/url\]/i', '', $item["body"]));
 466
 467                                 // Replace the content when the title is longer than the body
 468                                 $replace = (strlen($item["title"]) > strlen($item["body"]));
 469
 470                                 // Replace it, when there is an image in the body
 471                                 if (strstr($item["body"], '[/img]')) {
 472                                         $replace = true;
 473                                 }
 474
 475                                 // Replace it, when there is a link in the body
 476                                 if (strstr($item["body"], '[/url]')) {
 477                                         $replace = true;
 478                                 }
 479
 480                                 $saved_body = $item["body"];
 481                                 $saved_title = $item["title"];
 482
 483                                 if ($replace) {
 484                                         $item["body"] = trim($item["title"]);
 485                                 }
 486
 487                                 $data = ParseUrl::getSiteinfoCached($item['plink']);
 488                                 if (!empty($data['text']) && !empty($data['title']) && (mb_strlen($item['body']) < mb_strlen($data['text']))) {
 489                                         // When the fetched page info text is longer than the body, we do try to enhance the body
 490                                         if (!empty($item['body']) && (strpos($data['title'], $item['body']) === false) && (strpos($data['text'], $item['body']) === false)) {
 491                                                 // The body is not part of the fetched page info title or page info text. So we add the text to the body
 492                                                 $item['body'] .= "\n\n" . $data['text'];
 493                                         } else {
 494                                                 // Else we replace the body with the page info text
 495                                                 $item['body'] = $data['text'];
 496                                         }
 497                                 }
 498
 499                                 $data = PageInfo::queryUrl($item["plink"], false, $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_denylist"] ?? '');
 500
 501                                 if (!empty($data)) {
 502                                         // Take the data that was provided by the feed if the query is empty
 503                                         if (($data['type'] == 'link') && empty($data['title']) && empty($data['text'])) {
 504                                                 $data['title'] = $saved_title;
 505                                                 $item["body"] = $saved_body;
 506                                         }
 507
 508                                         $data_text = strip_tags(trim($data['text'] ?? ''));
 509                                         $item_body = strip_tags(trim($item['body'] ?? ''));
 510
 511                                         if (!empty($data_text) && (($data_text == $item_body) || strstr($item_body, $data_text))) {
 512                                                 $data['text'] = '';
 513                                         }
 514
 515                                         // We always strip the title since it will be added in the page information
 516                                         $item["title"] = "";
 517                                         $item["body"] = $item["body"] . "\n" . PageInfo::getFooterFromData($data, false);
 518                                         $taglist = $contact["fetch_further_information"] == 2 ? PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"] ?? '') : [];
 519                                         $item["object-type"] = Activity\ObjectType::BOOKMARK;
 520                                         $attachments = [];
 521                                 }
 522                         } else {
 523                                 if (!empty($summary)) {
 524                                         $item["body"] = '[abstract]' . HTML::toBBCode($summary, $basepath) . "[/abstract]\n" . $item["body"];
 525                                 }
 526
 527                                 if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] == 3)) {
 528                                         if (empty($taglist)) {
 529                                                 $taglist = PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"] ?? '');
 530                                         }
 531                                         $item["body"] .= "\n" . self::tagToString($taglist);
 532                                 } else {
 533                                         $taglist = [];
 534                                 }
 535
 536                                 // Add the link to the original feed entry if not present in feed
 537                                 if (($item['plink'] != '') && !strstr($item["body"], $item['plink'])) {
 538                                         $item["body"] .= "[hr][url]" . $item['plink'] . "[/url]";
 539                                 }
 540                         }
 541
 542                         if (empty($item['title'])) {
 543                                 $item['post-type'] = Item::PT_NOTE;
 544                         }
 545
 546                         Logger::info('Stored feed', ['item' => $item]);
 547
 548                         $notify = Item::isRemoteSelf($contact, $item);
 549
 550                         // Distributed items should have a well formatted URI.
 551                         // Additionally we have to avoid conflicts with identical URI between imported feeds and these items.
 552                         if ($notify) {
 553                                 $item['guid'] = Item::guidFromUri($orig_plink, DI::baseUrl()->getHostname());
 554                                 $item['uri'] = Item::newURI($item['uid'], $item['guid']);
 555                                 unset($item['thr-parent']);
 556                                 unset($item['parent-uri']);
 557
 558                                 // Set the delivery priority for "remote self" to "medium"
 559                                 $notify = PRIORITY_MEDIUM;
 560                         }
 561
 562                         $condition = ['uid' => $item['uid'], 'uri' => $item['uri']];
 563                         if (!Post::exists($condition) && !Post\Delayed::exists($item["uri"], $item['uid'])) {
 564                                 if (!$notify) {
 565                                         Post\Delayed::publish($item, $notify, $taglist, $attachments);
 566                                 } else {
 567                                         $postings[] = ['item' => $item, 'notify' => $notify,
 568                                                 'taglist' => $taglist, 'attachments' => $attachments];
 569                                 }
 570                         } else {
 571                                 Logger::info('Post already created or exists in the delayed posts queue', ['uid' => $item['uid'], 'uri' => $item["uri"]]);
 572                         }
 573                 }
 574
 575                 if (!empty($postings)) {
 576                         $min_posting = DI::config()->get('system', 'minimum_posting_interval', 0);
 577                         $total = count($postings);
 578                         if ($total > 1) {
 579                                 // Posts shouldn't be delayed more than a day
 580                                 $interval = min(1440, self::getPollInterval($contact));
 581                                 $delay = max(round(($interval * 60) / $total), 60 * $min_posting);
 582                                 Logger::info('Got posting delay', ['delay' => $delay, 'interval' => $interval, 'items' => $total, 'cid' => $contact['id'], 'url' => $contact['url']]);
 583                         } else {
 584                                 $delay = 0;
 585                         }
 586
 587                         $post_delay = 0;
 588
 589                         foreach ($postings as $posting) {
 590                                 if ($delay > 0) {
 591                                         $publish_time = time() + $post_delay;
 592                                         $post_delay += $delay;
 593                                 } else {
 594                                         $publish_time = time();
 595                                 }
 596
 597                                 $last_publish = DI::pConfig()->get($posting['item']['uid'], 'system', 'last_publish', 0, true);
 598                                 $next_publish = max($last_publish + (60 * $min_posting), time());
 599                                 if ($publish_time < $next_publish) {
 600                                         $publish_time = $next_publish;
 601                                 }
 602                                 $publish_at = date(DateTimeFormat::MYSQL, $publish_time);
 603
 604                                 if (Post\Delayed::add($posting['item']['uri'], $posting['item'], $posting['notify'], Post\Delayed::PREPARED, $publish_at, $posting['taglist'], $posting['attachments'])) {
 605                                         DI::pConfig()->set($item['uid'], 'system', 'last_publish', $publish_time);
 606                                 }
 607                         }
 608                 }
 609
 610                 if (!$dryRun && DI::config()->get('system', 'adjust_poll_frequency')) {
 611                         self::adjustPollFrequency($contact, $creation_dates);
 612                 }
 613
 614                 return ["header" => $author, "items" => $items];
 615         }
 616
 617         /**
 618          * Automatically adjust the poll frequency according to the post frequency
 619          *
 620          * @param array $contact
 621          * @param array $creation_dates
 622          * @return void
 623          */
 624         private static function adjustPollFrequency(array $contact, array $creation_dates)
 625         {
 626                 if ($contact['network'] != Protocol::FEED) {
 627                         Logger::info('Contact is no feed, skip.', ['id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url'], 'network' => $contact['network']]);
 628                         return;
 629                 }
 630
 631                 if (!empty($creation_dates)) {
 632                         // Count the post frequency and the earliest and latest post date
 633                         $frequency = [];
 634                         $oldest = time();
 635                         $newest = 0;
 636                         $oldest_date = $newest_date = '';
 637
 638                         foreach ($creation_dates as $date) {
 639                                 $timestamp = strtotime($date);
 640                                 $day = intdiv($timestamp, 86400);
 641                                 $hour = $timestamp % 86400;
 642
 643                                 // Only have a look at values from the last seven days
 644                                 if (((time() / 86400) - $day) < 7) {
 645                                         if (empty($frequency[$day])) {
 646                                                 $frequency[$day] = ['count' => 1, 'low' => $hour, 'high' => $hour];
 647                                         } else {
 648                                                 ++$frequency[$day]['count'];
 649                                                 if ($frequency[$day]['low'] > $hour) {
 650                                                         $frequency[$day]['low'] = $hour;
 651                                                 }
 652                                                 if ($frequency[$day]['high'] < $hour) {
 653                                                         $frequency[$day]['high'] = $hour;
 654                                                 }
 655                                         }
 656                                 }
 657                                 if ($oldest > $day) {
 658                                         $oldest = $day;
 659                                         $oldest_date = $date;
 660                                 }
 661
 662                                 if ($newest < $day) {
 663                                         $newest = $day;
 664                                         $newest_date = $date;
 665                                 }
 666                         }
 667
 668                         if (count($creation_dates) == 1) {
 669                                 Logger::info('Feed had posted a single time, switching to daily polling', ['newest' => $newest_date, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 670                                 $priority = 8; // Poll once a day
 671                         }
 672
 673                         if (empty($priority) && (((time() / 86400) - $newest) > 730)) {
 674                                 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']]);
 675                                 $priority = 10; // Poll every month
 676                         }
 677
 678                         if (empty($priority) && (((time() / 86400) - $newest) > 365)) {
 679                                 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']]);
 680                                 $priority = 9; // Poll every week
 681                         }
 682
 683                         if (empty($priority) && empty($frequency)) {
 684                                 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']]);
 685                                 $priority = 8; // Poll once a day
 686                         }
 687
 688                         if (empty($priority)) {
 689                                 // Calculate the highest "posts per day" value
 690                                 $max = 0;
 691                                 foreach ($frequency as $entry) {
 692                                         if (($entry['count'] == 1) || ($entry['high'] == $entry['low'])) {
 693                                                 continue;
 694                                         }
 695
 696                                         // We take the earliest and latest post day and interpolate the number of post per day
 697                                         // that would had been created with this post frequency
 698
 699                                         // Assume at least four hours between oldest and newest post per day - should be okay for news outlets
 700                                         $duration = max($entry['high'] - $entry['low'], 14400);
 701                                         $ppd = (86400 / $duration) * $entry['count'];
 702                                         if ($ppd > $max) {
 703                                                 $max = $ppd;
 704                                         }
 705                                 }
 706                                 if ($max > 48) {
 707                                         $priority = 1; // Poll every quarter hour
 708                                 } elseif ($max > 24) {
 709                                         $priority = 2; // Poll half an hour
 710                                 } elseif ($max > 12) {
 711                                         $priority = 3; // Poll hourly
 712                                 } elseif ($max > 8) {
 713                                         $priority = 4; // Poll every two hours
 714                                 } elseif ($max > 4) {
 715                                         $priority = 5; // Poll every three hours
 716                                 } elseif ($max > 2) {
 717                                         $priority = 6; // Poll every six hours
 718                                 } else {
 719                                         $priority = 7; // Poll twice a day
 720                                 }
 721                                 Logger::info('Calculated priority by the posts per day', ['priority' => $priority, 'max' => round($max, 2), 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 722                         }
 723                 } else {
 724                         Logger::info('No posts, switching to daily polling', ['id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 725                         $priority = 8; // Poll once a day
 726                 }
 727
 728                 if ($contact['rating'] != $priority) {
 729                         Logger::notice('Adjusting priority', ['old' => $contact['rating'], 'new' => $priority, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
 730                         DBA::update('contact', ['rating' => $priority], ['id' => $contact['id']]);
 731                 }
 732         }
 733
 734         /**
 735          * Get the poll interval for the given contact array
 736          *
 737          * @param array $contact
 738          * @return int Poll interval in minutes
 739          */
 740         public static function getPollInterval(array $contact)
 741         {
 742                 if (in_array($contact['network'], [Protocol::MAIL, Protocol::FEED])) {
 743                         $ratings = [0, 3, 7, 8, 9, 10];
 744                         if (DI::config()->get('system', 'adjust_poll_frequency') && ($contact['network'] == Protocol::FEED)) {
 745                                 $rating = $contact['rating'];
 746                         } elseif (array_key_exists($contact['priority'], $ratings)) {
 747                                 $rating = $ratings[$contact['priority']];
 748                         } else {
 749                                 $rating = -1;
 750                         }
 751                 } else {
 752                         // Check once a week per default for all other networks
 753                         $rating = 9;
 754                 }
 755
 756                 // Friendica and OStatus are checked once a day
 757                 if (in_array($contact['network'], [Protocol::DFRN, Protocol::OSTATUS])) {
 758                         $rating = 8;
 759                 }
 760
 761                 // Check archived contacts or contacts with unsupported protocols once a month
 762                 if ($contact['archive'] || in_array($contact['network'], [Protocol::ZOT, Protocol::PHANTOM])) {
 763                         $rating = 10;
 764                 }
 765
 766                 if ($rating < 0) {
 767                         return 0;
 768                 }
 769                 /*
 770                  * Based on $contact['priority'], should we poll this site now? Or later?
 771                  */
 772
 773                 $min_poll_interval = max(1, DI::config()->get('system', 'min_poll_interval'));
 774
 775                 $poll_intervals = [$min_poll_interval, 15, 30, 60, 120, 180, 360, 720 ,1440, 10080, 43200];
 776
 777                 //$poll_intervals = [$min_poll_interval . ' minute', '15 minute', '30 minute',
 778                 //      '1 hour', '2 hour', '3 hour', '6 hour', '12 hour' ,'1 day', '1 week', '1 month'];
 779
 780                 return $poll_intervals[$rating];
 781         }
 782
 783         /**
 784          * Convert a tag array to a tag string
 785          *
 786          * @param array $tags
 787          * @return string tag string
 788          */
 789         private static function tagToString(array $tags)
 790         {
 791                 $tagstr = '';
 792
 793                 foreach ($tags as $tag) {
 794                         if ($tagstr != "") {
 795                                 $tagstr .= ", ";
 796                         }
 797
 798                         $tagstr .= "#[url=" . DI::baseUrl() . "/search?tag=" . urlencode($tag) . "]" . $tag . "[/url]";
 799                 }
 800
 801                 return $tagstr;
 802         }
 803
 804         private static function titleIsBody($title, $body)
 805         {
 806                 $title = strip_tags($title);
 807                 $title = trim($title);
 808                 $title = html_entity_decode($title, ENT_QUOTES, 'UTF-8');
 809                 $title = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $title);
 810
 811                 $body = strip_tags($body);
 812                 $body = trim($body);
 813                 $body = html_entity_decode($body, ENT_QUOTES, 'UTF-8');
 814                 $body = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $body);
 815
 816                 if (strlen($title) < strlen($body)) {
 817                         $body = substr($body, 0, strlen($title));
 818                 }
 819
 820                 if (($title != $body) && (substr($title, -3) == "...")) {
 821                         $pos = strrpos($title, "...");
 822                         if ($pos > 0) {
 823                                 $title = substr($title, 0, $pos);
 824                                 $body = substr($body, 0, $pos);
 825                         }
 826                 }
 827                 return ($title == $body);
 828         }
 829
 830         /**
 831          * Creates the Atom feed for a given nickname
 832          *
 833          * Supported filters:
 834          * - activity (default): all the public posts
 835          * - posts: all the public top-level posts
 836          * - comments: all the public replies
 837          *
 838          * Updates the provided last_update parameter if the result comes from the
 839          * cache or it is empty
 840          *
 841          * @param string  $owner_nick  Nickname of the feed owner
 842          * @param string  $last_update Date of the last update
 843          * @param integer $max_items   Number of maximum items to fetch
 844          * @param string  $filter      Feed items filter (activity, posts or comments)
 845          * @param boolean $nocache     Wether to bypass caching
 846          *
 847          * @return string Atom feed
 848          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 849          * @throws \ImagickException
 850          */
 851         public static function atom($owner_nick, $last_update, $max_items = 300, $filter = 'activity', $nocache = false)
 852         {
 853                 $stamp = microtime(true);
 854
 855                 $owner = User::getOwnerDataByNick($owner_nick);
 856                 if (!$owner) {
 857                         return;
 858                 }
 859
 860                 $cachekey = "feed:feed:" . $owner_nick . ":" . $filter . ":" . $last_update;
 861
 862                 $previous_created = $last_update;
 863
 864                 // Don't cache when the last item was posted less then 15 minutes ago (Cache duration)
 865                 if ((time() - strtotime($owner['last-item'])) < 15*60) {
 866                         $result = DI::cache()->get($cachekey);
 867                         if (!$nocache && !is_null($result)) {
 868                                 Logger::info('Cached feed duration', ['seconds' => number_format(microtime(true) - $stamp, 3), 'nick' => $owner_nick, 'filter' => $filter, 'created' => $previous_created]);
 869                                 return $result['feed'];
 870                         }
 871                 }
 872
 873                 $check_date = empty($last_update) ? '' : DateTimeFormat::utc($last_update);
 874                 $authorid = Contact::getIdForURL($owner["url"]);
 875
 876                 $condition = ["`uid` = ? AND `received` > ? AND NOT `deleted` AND `gravity` IN (?, ?)
 877                         AND `private` != ? AND `visible` AND `wall` AND `parent-network` IN (?, ?, ?, ?)",
 878                         $owner["uid"], $check_date, GRAVITY_PARENT, GRAVITY_COMMENT,
 879                         Item::PRIVATE, Protocol::ACTIVITYPUB,
 880                         Protocol::OSTATUS, Protocol::DFRN, Protocol::DIASPORA];
 881
 882                 if ($filter === 'comments') {
 883                         $condition[0] .= " AND `gravity` = ? ";
 884                         $condition[] = GRAVITY_COMMENT;
 885                 }
 886
 887                 if ($owner['account-type'] != User::ACCOUNT_TYPE_COMMUNITY) {
 888                         $condition[0] .= " AND `contact-id` = ? AND `author-id` = ?";
 889                         $condition[] = $owner["id"];
 890                         $condition[] = $authorid;
 891                 }
 892
 893                 $params = ['order' => ['received' => true], 'limit' => $max_items];
 894
 895                 if ($filter === 'posts') {
 896                         $ret = Post::selectThread(Item::DELIVER_FIELDLIST, $condition, $params);
 897                 } else {
 898                         $ret = Post::select(Item::DELIVER_FIELDLIST, $condition, $params);
 899                 }
 900
 901                 $items = Post::toArray($ret);
 902
 903                 $doc = new DOMDocument('1.0', 'utf-8');
 904                 $doc->formatOutput = true;
 905
 906                 $root = self::addHeader($doc, $owner, $filter);
 907
 908                 foreach ($items as $item) {
 909                         $entry = self::entry($doc, $item, $owner);
 910                         $root->appendChild($entry);
 911
 912                         if ($last_update < $item['created']) {
 913                                 $last_update = $item['created'];
 914                         }
 915                 }
 916
 917                 $feeddata = trim($doc->saveXML());
 918
 919                 $msg = ['feed' => $feeddata, 'last_update' => $last_update];
 920                 DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
 921
 922                 Logger::info('Feed duration', ['seconds' => number_format(microtime(true) - $stamp, 3), 'nick' => $owner_nick, 'filter' => $filter, 'created' => $previous_created]);
 923
 924                 return $feeddata;
 925         }
 926
 927         /**
 928          * Adds the header elements to the XML document
 929          *
 930          * @param DOMDocument $doc       XML document
 931          * @param array       $owner     Contact data of the poster
 932          * @param string      $filter    The related feed filter (activity, posts or comments)
 933          *
 934          * @return object header root element
 935          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 936          */
 937         private static function addHeader(DOMDocument $doc, array $owner, $filter)
 938         {
 939                 $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 940                 $doc->appendChild($root);
 941
 942                 $title = '';
 943                 $selfUri = '/feed/' . $owner["nick"] . '/';
 944                 switch ($filter) {
 945                         case 'activity':
 946                                 $title = DI::l10n()->t('%s\'s timeline', $owner['name']);
 947                                 $selfUri .= $filter;
 948                                 break;
 949                         case 'posts':
 950                                 $title = DI::l10n()->t('%s\'s posts', $owner['name']);
 951                                 break;
 952                         case 'comments':
 953                                 $title = DI::l10n()->t('%s\'s comments', $owner['name']);
 954                                 $selfUri .= $filter;
 955                                 break;
 956                 }
 957
 958                 $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION . "-" . DB_UPDATE_VERSION];
 959                 XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
 960                 XML::addElement($doc, $root, "id", DI::baseUrl() . "/profile/" . $owner["nick"]);
 961                 XML::addElement($doc, $root, "title", $title);
 962                 XML::addElement($doc, $root, "subtitle", sprintf("Updates from %s on %s", $owner["name"], DI::config()->get('config', 'sitename')));
 963                 XML::addElement($doc, $root, "logo", Contact::getAvatarUrlForId($owner['id'], Proxy::SIZE_SMALL, $owner['updated']));
 964                 XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
 965
 966                 $author = self::addAuthor($doc, $owner);
 967                 $root->appendChild($author);
 968
 969                 $attributes = ["href" => $owner["url"], "rel" => "alternate", "type" => "text/html"];
 970                 XML::addElement($doc, $root, "link", "", $attributes);
 971
 972                 OStatus::hublinks($doc, $root, $owner["nick"]);
 973
 974                 $attributes = ["href" => DI::baseUrl() . $selfUri, "rel" => "self", "type" => "application/atom+xml"];
 975                 XML::addElement($doc, $root, "link", "", $attributes);
 976
 977                 return $root;
 978         }
 979
 980         /**
 981          * Adds the author element to the XML document
 982          *
 983          * @param DOMDocument $doc          XML document
 984          * @param array       $owner        Contact data of the poster
 985          *
 986          * @return \DOMElement author element
 987          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 988          */
 989         private static function addAuthor(DOMDocument $doc, array $owner)
 990         {
 991                 $author = $doc->createElement("author");
 992                 XML::addElement($doc, $author, "uri", $owner["url"]);
 993                 XML::addElement($doc, $author, "name", $owner["nick"]);
 994                 XML::addElement($doc, $author, "email", $owner["addr"]);
 995
 996                 return $author;
 997         }
 998
 999         /**
1000          * Adds an entry element to the XML document
1001          *
1002          * @param DOMDocument $doc       XML document
1003          * @param array       $item      Data of the item that is to be posted
1004          * @param array       $owner     Contact data of the poster
1005          * @param bool        $toplevel  optional default false
1006          *
1007          * @return \DOMElement Entry element
1008          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1009          * @throws \ImagickException
1010          */
1011         private static function entry(DOMDocument $doc, array $item, array $owner)
1012         {
1013                 $xml = null;
1014
1015                 $repeated_guid = OStatus::getResharedGuid($item);
1016                 if ($repeated_guid != "") {
1017                         $xml = self::reshareEntry($doc, $item, $owner, $repeated_guid);
1018                 }
1019
1020                 if ($xml) {
1021                         return $xml;
1022                 }
1023
1024                 return self::noteEntry($doc, $item, $owner);
1025         }
1026
1027                 /**
1028          * Adds an entry element with reshared content
1029          *
1030          * @param DOMDocument $doc           XML document
1031          * @param array       $item          Data of the item that is to be posted
1032          * @param array       $owner         Contact data of the poster
1033          * @param string      $repeated_guid guid
1034          * @param bool        $toplevel      Is it for en entry element (false) or a feed entry (true)?
1035          *
1036          * @return bool Entry element
1037          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1038          * @throws \ImagickException
1039          */
1040         private static function reshareEntry(DOMDocument $doc, array $item, array $owner, $repeated_guid)
1041         {
1042                 if (($item['gravity'] != GRAVITY_PARENT) && (Strings::normaliseLink($item["author-link"]) != Strings::normaliseLink($owner["url"]))) {
1043                         Logger::info('Feed entry author does not match feed owner', ['owner' => $owner["url"], 'author' => $item["author-link"]]);
1044                 }
1045
1046                 $entry = OStatus::entryHeader($doc, $owner, $item, false);
1047
1048                 $condition = ['uid' => $owner["uid"], 'guid' => $repeated_guid, 'private' => [Item::PUBLIC, Item::UNLISTED],
1049                         'network' => Protocol::FEDERATED];
1050                 $repeated_item = Post::selectFirst(Item::DELIVER_FIELDLIST, $condition);
1051                 if (!DBA::isResult($repeated_item)) {
1052                         return false;
1053                 }
1054
1055                 self::entryContent($doc, $entry, $item, self::getTitle($repeated_item), Activity::SHARE, false);
1056
1057                 self::entryFooter($doc, $entry, $item, $owner);
1058
1059                 return $entry;
1060         }
1061
1062         /**
1063          * Adds a regular entry element
1064          *
1065          * @param DOMDocument $doc       XML document
1066          * @param array       $item      Data of the item that is to be posted
1067          * @param array       $owner     Contact data of the poster
1068          * @param bool        $toplevel  Is it for en entry element (false) or a feed entry (true)?
1069          *
1070          * @return \DOMElement Entry element
1071          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1072          * @throws \ImagickException
1073          */
1074         private static function noteEntry(DOMDocument $doc, array $item, array $owner)
1075         {
1076                 if (($item['gravity'] != GRAVITY_PARENT) && (Strings::normaliseLink($item["author-link"]) != Strings::normaliseLink($owner["url"]))) {
1077                         Logger::info('Feed entry author does not match feed owner', ['owner' => $owner["url"], 'author' => $item["author-link"]]);
1078                 }
1079
1080                 $entry = OStatus::entryHeader($doc, $owner, $item, false);
1081
1082                 self::entryContent($doc, $entry, $item, self::getTitle($item), '', true);
1083
1084                 self::entryFooter($doc, $entry, $item, $owner);
1085
1086                 return $entry;
1087         }
1088
1089         /**
1090          * Adds elements to the XML document
1091          *
1092          * @param DOMDocument $doc       XML document
1093          * @param \DOMElement $entry     Entry element where the content is added
1094          * @param array       $item      Data of the item that is to be posted
1095          * @param array       $owner     Contact data of the poster
1096          * @param string      $title     Title for the post
1097          * @param string      $verb      The activity verb
1098          * @param bool        $complete  Add the "status_net" element?
1099          * @param bool        $feed_mode Behave like a regular feed for users if true
1100          * @return void
1101          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1102          */
1103         private static function entryContent(DOMDocument $doc, \DOMElement $entry, array $item, $title, $verb = "", $complete = true)
1104         {
1105                 if ($verb == "") {
1106                         $verb = OStatus::constructVerb($item);
1107                 }
1108
1109                 XML::addElement($doc, $entry, "id", $item["uri"]);
1110                 XML::addElement($doc, $entry, "title", html_entity_decode($title, ENT_QUOTES, 'UTF-8'));
1111
1112                 $body = OStatus::formatPicturePost($item['body'], $item['uri-id']);
1113
1114                 $body = BBCode::convertForUriId($item['uri-id'], $body, BBCode::ACTIVITYPUB);
1115
1116                 XML::addElement($doc, $entry, "content", $body, ["type" => "html"]);
1117
1118                 XML::addElement($doc, $entry, "link", "", ["rel" => "alternate", "type" => "text/html",
1119                                                                 "href" => DI::baseUrl()."/display/".$item["guid"]]
1120                 );
1121
1122                 XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM));
1123                 XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM));
1124         }
1125
1126         /**
1127          * Adds the elements at the foot of an entry to the XML document
1128          *
1129          * @param DOMDocument $doc       XML document
1130          * @param object      $entry     The entry element where the elements are added
1131          * @param array       $item      Data of the item that is to be posted
1132          * @param array       $owner     Contact data of the poster
1133          * @param bool        $complete  default true
1134          * @return void
1135          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1136          */
1137         private static function entryFooter(DOMDocument $doc, $entry, array $item, array $owner)
1138         {
1139                 $mentioned = [];
1140
1141                 if ($item['gravity'] != GRAVITY_PARENT) {
1142                         $parent = Post::selectFirst(['guid', 'author-link', 'owner-link'], ['id' => $item['parent']]);
1143
1144                         $thrparent = Post::selectFirst(['guid', 'author-link', 'owner-link', 'plink'], ['uid' => $owner["uid"], 'uri' => $item['thr-parent']]);
1145
1146                         if (DBA::isResult($thrparent)) {
1147                                 $mentioned[$thrparent["author-link"]] = $thrparent["author-link"];
1148                                 $mentioned[$thrparent["owner-link"]] = $thrparent["owner-link"];
1149                                 $parent_plink = $thrparent["plink"];
1150                         } else {
1151                                 $mentioned[$parent["author-link"]] = $parent["author-link"];
1152                                 $mentioned[$parent["owner-link"]] = $parent["owner-link"];
1153                                 $parent_plink = DI::baseUrl()."/display/".$parent["guid"];
1154                         }
1155
1156                         $attributes = [
1157                                         "ref" => $item['thr-parent'],
1158                                         "href" => $parent_plink];
1159                         XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
1160
1161                         $attributes = [
1162                                         "rel" => "related",
1163                                         "href" => $parent_plink];
1164                         XML::addElement($doc, $entry, "link", "", $attributes);
1165                 }
1166
1167                 // uri-id isn't present for follow entry pseudo-items
1168                 $tags = Tag::getByURIId($item['uri-id'] ?? 0);
1169                 foreach ($tags as $tag) {
1170                         $mentioned[$tag['url']] = $tag['url'];
1171                 }
1172
1173                 foreach ($tags as $tag) {
1174                         if ($tag['type'] == Tag::HASHTAG) {
1175                                 XML::addElement($doc, $entry, "category", "", ["term" => $tag['name']]);
1176                         }
1177                 }
1178
1179                 OStatus::getAttachment($doc, $entry, $item);
1180         }
1181
1182         /**
1183          * Fetch or create title for feed entry
1184          *
1185          * @param array $item
1186          * @return string title
1187          */
1188         private static function getTitle(array $item)
1189         {
1190                 if ($item['title'] != '') {
1191                         return BBCode::convertForUriId($item['uri-id'], $item['title'], BBCode::ACTIVITYPUB);
1192                 }
1193
1194                 // Fetch information about the post
1195                 $siteinfo = BBCode::getAttachedData($item["body"]);
1196                 if (isset($siteinfo["title"])) {
1197                         return $siteinfo["title"];
1198                 }
1199
1200                 // If no bookmark is found then take the first line
1201                 // Remove the share element before fetching the first line
1202                 $title = trim(preg_replace("/\[share.*?\](.*?)\[\/share\]/ism","\n$1\n",$item['body']));
1203
1204                 $title = BBCode::toPlaintext($title)."\n";
1205                 $pos = strpos($title, "\n");
1206                 $trailer = "";
1207                 if (($pos == 0) || ($pos > 100)) {
1208                         $pos = 100;
1209                         $trailer = "...";
1210                 }
1211
1212                 return substr($title, 0, $pos) . $trailer;
1213         }
1214 }