src/Protocol/OStatus.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2023, 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 DOMElement;
  26 use DOMXPath;
  27 use Friendica\App;
  28 use Friendica\Content\Text\BBCode;
  29 use Friendica\Content\Text\HTML;
  30 use Friendica\Core\Cache\Enum\Duration;
  31 use Friendica\Core\Logger;
  32 use Friendica\Core\Protocol;
  33 use Friendica\Database\DBA;
  34 use Friendica\DI;
  35 use Friendica\Model\APContact;
  36 use Friendica\Model\Contact;
  37 use Friendica\Model\Conversation;
  38 use Friendica\Model\Item;
  39 use Friendica\Model\ItemURI;
  40 use Friendica\Model\Post;
  41 use Friendica\Model\Tag;
  42 use Friendica\Model\User;
  43 use Friendica\Network\HTTPClient\Client\HttpClientAccept;
  44 use Friendica\Network\Probe;
  45 use Friendica\Util\DateTimeFormat;
  46 use Friendica\Util\Images;
  47 use Friendica\Util\Proxy;
  48 use Friendica\Util\Strings;
  49 use Friendica\Util\XML;
  50
  51 /**
  52  * This class contain functions for the OStatus protocol
  53  */
  54 class OStatus
  55 {
  56         private static $itemlist;
  57         private static $conv_list = [];
  58
  59         /**
  60          * Fetches author data
  61          *
  62          * @param DOMXPath $xpath     The xpath object
  63          * @param object   $context   The xml context of the author details
  64          * @param array    $importer  user record of the importing user
  65          * @param array    $contact   Called by reference, will contain the fetched contact
  66          * @param bool     $onlyfetch Only fetch the header without updating the contact entries
  67          *
  68          * @return array Array of author related entries for the item
  69          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  70          * @throws \ImagickException
  71          */
  72         private static function fetchAuthor(DOMXPath $xpath, $context, array $importer, array &$contact = null, bool $onlyfetch): array
  73         {
  74                 $author = [];
  75                 $author['author-link'] = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()', $context);
  76                 $author['author-name'] = XML::getFirstNodeValue($xpath, 'atom:author/atom:name/text()', $context);
  77                 $addr = XML::getFirstNodeValue($xpath, 'atom:author/atom:email/text()', $context);
  78
  79                 $aliaslink = $author['author-link'];
  80
  81                 $alternate_item = $xpath->query("atom:author/atom:link[@rel='alternate']", $context)->item(0);
  82                 if (is_object($alternate_item)) {
  83                         foreach ($alternate_item->attributes as $attributes) {
  84                                 if (($attributes->name == 'href') && ($attributes->textContent != '')) {
  85                                         $author['author-link'] = $attributes->textContent;
  86                                 }
  87                         }
  88                 }
  89                 $author['author-id'] = Contact::getIdForURL($author['author-link']);
  90
  91                 $author['contact-id'] = ($contact['id'] ?? 0) ?: $author['author-id'];
  92
  93                 $contact = [];
  94
  95 /*
  96                 This here would be better, but we would get problems with contacts from the statusnet addon
  97                 This is kept here as a reminder for the future
  98
  99                 $cid = Contact::getIdForURL($author['author-link'], $importer['uid']);
 100                 if ($cid) {
 101                         $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
 102                 }
 103 */
 104                 if ($aliaslink != '') {
 105                         $contact = DBA::selectFirst('contact', [], [
 106                                 "`uid` = ? AND `alias` = ? AND `rel` IN (?, ?)",
 107                                 $importer['uid'],
 108                                 $aliaslink,
 109                                 Contact::SHARING, Contact::FRIEND,
 110                         ]);
 111                 }
 112
 113                 if (!DBA::isResult($contact) && $author['author-link'] != '') {
 114                         if ($aliaslink == '') {
 115                                 $aliaslink = $author['author-link'];
 116                         }
 117
 118                         $contact = DBA::selectFirst('contact', [], [
 119                                 "`uid` = ? AND `nurl` IN (?, ?) AND `rel` IN (?, ?)",
 120                                 $importer['uid'],
 121                                 Strings::normaliseLink($author['author-link']),
 122                                 Strings::normaliseLink($aliaslink),
 123                                 Contact::SHARING,
 124                                 Contact::FRIEND,
 125                         ]);
 126                 }
 127
 128                 if (!DBA::isResult($contact) && ($addr != '')) {
 129                         $contact = DBA::selectFirst('contact', [], [
 130                                 "`uid` = ? AND `addr` = ? AND `rel` IN (?, ?)",
 131                                 $importer['uid'],
 132                                 $addr,
 133                                 Contact::SHARING,
 134                                 Contact::FRIEND,
 135                         ]);
 136                 }
 137
 138                 if (DBA::isResult($contact)) {
 139                         if ($contact['blocked']) {
 140                                 $contact['id'] = -1;
 141                         } elseif (!empty(APContact::getByURL($contact['url'], false))) {
 142                                 ActivityPub\Receiver::switchContact($contact['id'], $importer['uid'], $contact['url']);
 143                         }
 144                         $author['contact-id'] = $contact['id'];
 145                 }
 146
 147                 $avatarlist = [];
 148                 $avatars = $xpath->query("atom:author/atom:link[@rel='avatar']", $context);
 149                 foreach ($avatars as $avatar) {
 150                         $href = '';
 151                         $width = 0;
 152                         foreach ($avatar->attributes as $attributes) {
 153                                 if ($attributes->name == 'href') {
 154                                         $href = $attributes->textContent;
 155                                 }
 156                                 if ($attributes->name == 'width') {
 157                                         $width = $attributes->textContent;
 158                                 }
 159                         }
 160                         if ($href != '') {
 161                                 $avatarlist[$width] = $href;
 162                         }
 163                 }
 164                 if (count($avatarlist) > 0) {
 165                         krsort($avatarlist);
 166                         $author['author-avatar'] = Probe::fixAvatar(current($avatarlist), $author['author-link']);
 167                 }
 168
 169                 $displayname = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()', $context);
 170                 if ($displayname != '') {
 171                         $author['author-name'] = $displayname;
 172                 }
 173
 174                 $author['owner-id'] = $author['author-id'];
 175
 176                 // Only update the contacts if it is an OStatus contact
 177                 if (DBA::isResult($contact) && ($contact['id'] > 0) && !$onlyfetch && ($contact['network'] == Protocol::OSTATUS)) {
 178
 179                         // Update contact data
 180                         $current = $contact;
 181                         unset($current['name-date']);
 182
 183                         // This query doesn't seem to work
 184                         // $value = $xpath->query("atom:link[@rel='salmon']", $context)->item(0)->nodeValue;
 185                         // if ($value != "")
 186                         //      $contact["notify"] = $value;
 187
 188                         // This query doesn't seem to work as well - I hate these queries
 189                         // $value = $xpath->query("atom:link[@rel='self' and @type='application/atom+xml']", $context)->item(0)->nodeValue;
 190                         // if ($value != "")
 191                         //      $contact["poll"] = $value;
 192
 193                         $contact['url'] = $author['author-link'];
 194                         $contact['nurl'] = Strings::normaliseLink($contact['url']);
 195
 196                         $value = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()', $context);
 197                         if ($value != '') {
 198                                 $contact['alias'] = $value;
 199                         }
 200
 201                         $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()', $context);
 202                         if ($value != '') {
 203                                 $contact['name'] = $value;
 204                         }
 205
 206                         $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()', $context);
 207                         if ($value != '') {
 208                                 $contact['nick'] = $value;
 209                         }
 210
 211                         $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:note/text()', $context);
 212                         if ($value != '') {
 213                                 $contact['about'] = HTML::toBBCode($value);
 214                         }
 215
 216                         $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:address/poco:formatted/text()', $context);
 217                         if ($value != '') {
 218                                 $contact['location'] = $value;
 219                         }
 220
 221                         $contact['name-date'] = DateTimeFormat::utcNow();
 222
 223                         Contact::update($contact, ['id' => $contact['id']], $current);
 224
 225                         if (!empty($author['author-avatar']) && ($author['author-avatar'] != $current['avatar'])) {
 226                                 Logger::info('Update profile picture for contact ' . $contact['id']);
 227                                 Contact::updateAvatar($contact['id'], $author['author-avatar']);
 228                         }
 229
 230                         // Ensure that we are having this contact (with uid=0)
 231                         $cid = Contact::getIdForURL($aliaslink);
 232
 233                         if ($cid) {
 234                                 $fields = ['url', 'nurl', 'name', 'nick', 'alias', 'about', 'location'];
 235                                 $old_contact = DBA::selectFirst('contact', $fields, ['id' => $cid]);
 236
 237                                 // Update it with the current values
 238                                 $fields = [
 239                                         'url' => $author['author-link'],
 240                                         'name' => $contact['name'],
 241                                         'nurl' => Strings::normaliseLink($author['author-link']),
 242                                         'nick' => $contact['nick'],
 243                                         'alias' => $contact['alias'],
 244                                         'about' => $contact['about'],
 245                                         'location' => $contact['location'],
 246                                         'success_update' => DateTimeFormat::utcNow(),
 247                                         'last-update' => DateTimeFormat::utcNow(),
 248                                 ];
 249
 250                                 Contact::update($fields, ['id' => $cid], $old_contact);
 251
 252                                 // Update the avatar
 253                                 if (!empty($author['author-avatar'])) {
 254                                         Contact::updateAvatar($cid, $author['author-avatar']);
 255                                 }
 256                         }
 257                 } elseif (empty($contact['network']) || ($contact['network'] != Protocol::DFRN)) {
 258                         $contact = [];
 259                 }
 260
 261                 return $author;
 262         }
 263
 264         /**
 265          * Fetches author data from a given XML string
 266          *
 267          * @param string $xml      The XML
 268          * @param array  $importer user record of the importing user
 269          *
 270          * @return array Array of author related entries for the item
 271          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 272          * @throws \ImagickException
 273          */
 274         public static function salmonAuthor(string $xml, array $importer): array
 275         {
 276                 if (empty($xml)) {
 277                         return [];
 278                 }
 279
 280                 $doc = new DOMDocument();
 281                 @$doc->loadXML($xml);
 282
 283                 $xpath = new DOMXPath($doc);
 284                 $xpath->registerNamespace('atom', ActivityNamespace::ATOM1);
 285                 $xpath->registerNamespace('thr', ActivityNamespace::THREAD);
 286                 $xpath->registerNamespace('georss', ActivityNamespace::GEORSS);
 287                 $xpath->registerNamespace('activity', ActivityNamespace::ACTIVITY);
 288                 $xpath->registerNamespace('media', ActivityNamespace::MEDIA);
 289                 $xpath->registerNamespace('poco', ActivityNamespace::POCO);
 290                 $xpath->registerNamespace('ostatus', ActivityNamespace::OSTATUS);
 291                 $xpath->registerNamespace('statusnet', ActivityNamespace::STATUSNET);
 292
 293                 $contact = ['id' => 0];
 294
 295                 // Fetch the first author
 296                 $authordata = $xpath->query('//author')->item(0);
 297                 $author = self::fetchAuthor($xpath, $authordata, $importer, $contact, true);
 298                 return $author;
 299         }
 300
 301         /**
 302          * Read attributes from element
 303          *
 304          * @param object $element Element object
 305          * @return array attributes
 306          */
 307         private static function readAttributes($element): array
 308         {
 309                 $attribute = [];
 310
 311                 foreach ($element->attributes as $attributes) {
 312                         $attribute[$attributes->name] = $attributes->textContent;
 313                 }
 314
 315                 return $attribute;
 316         }
 317
 318         /**
 319          * Imports an XML string containing OStatus elements
 320          *
 321          * @param string $xml      The XML
 322          * @param array  $importer user record of the importing user
 323          * @param array  $contact  contact
 324          * @param string $hub      Called by reference, returns the fetched hub data
 325          * @return void
 326          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 327          * @throws \ImagickException
 328          */
 329         public static function import($xml, array $importer, array &$contact, &$hub)
 330         {
 331                 self::process($xml, $importer, $contact, $hub, false, true, Conversation::PUSH);
 332         }
 333
 334         /**
 335          * Internal feed processing
 336          *
 337          * @param string  $xml        The XML
 338          * @param array   $importer   user record of the importing user
 339          * @param array   $contact    contact
 340          * @param string  $hub        Called by reference, returns the fetched hub data
 341          * @param boolean $stored     Is the post fresh imported or from the database?
 342          * @param boolean $initialize Is it the leading post so that data has to be initialized?
 343          * @param integer $direction  Direction, default UNKNOWN(0)
 344          * @return boolean Could the XML be processed?
 345          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 346          * @throws \ImagickException
 347          */
 348         private static function process(string $xml, array $importer, array &$contact = null, string &$hub, bool $stored = false, bool $initialize = true, int $direction = Conversation::UNKNOWN)
 349         {
 350                 if ($initialize) {
 351                         self::$itemlist = [];
 352                         self::$conv_list = [];
 353                 }
 354
 355                 Logger::info('Import OStatus message for user ' . $importer['uid']);
 356
 357                 if (empty($xml)) {
 358                         return false;
 359                 }
 360
 361                 $doc = new DOMDocument();
 362                 @$doc->loadXML($xml);
 363
 364                 $xpath = new DOMXPath($doc);
 365                 $xpath->registerNamespace('atom', ActivityNamespace::ATOM1);
 366                 $xpath->registerNamespace('thr', ActivityNamespace::THREAD);
 367                 $xpath->registerNamespace('georss', ActivityNamespace::GEORSS);
 368                 $xpath->registerNamespace('activity', ActivityNamespace::ACTIVITY);
 369                 $xpath->registerNamespace('media', ActivityNamespace::MEDIA);
 370                 $xpath->registerNamespace('poco', ActivityNamespace::POCO);
 371                 $xpath->registerNamespace('ostatus', ActivityNamespace::OSTATUS);
 372                 $xpath->registerNamespace('statusnet', ActivityNamespace::STATUSNET);
 373
 374                 $hub = '';
 375                 $hub_items = $xpath->query("/atom:feed/atom:link[@rel='hub']")->item(0);
 376                 if (is_object($hub_items)) {
 377                         $hub_attributes = $hub_items->attributes;
 378                         if (is_object($hub_attributes)) {
 379                                 foreach ($hub_attributes as $hub_attribute) {
 380                                         if ($hub_attribute->name == 'href') {
 381                                                 $hub = $hub_attribute->textContent;
 382                                                 Logger::info('Found hub ', ['hub' => $hub]);
 383                                         }
 384                                 }
 385                         }
 386                 }
 387
 388                 $header = [];
 389                 $header['uid'] = $importer['uid'];
 390                 $header['network'] = Protocol::OSTATUS;
 391                 $header['wall'] = 0;
 392                 $header['origin'] = 0;
 393                 $header['gravity'] = Item::GRAVITY_COMMENT;
 394
 395                 if (!is_object($doc->firstChild) || empty($doc->firstChild->tagName)) {
 396                         return false;
 397                 }
 398
 399                 $first_child = $doc->firstChild->tagName;
 400
 401                 if ($first_child == 'feed') {
 402                         $entries = $xpath->query('/atom:feed/atom:entry');
 403                 } else {
 404                         $entries = $xpath->query('/atom:entry');
 405                 }
 406
 407                 if ($entries->length == 1) {
 408                         // We reformat the XML to make it better readable
 409                         $doc2 = new DOMDocument();
 410                         $doc2->loadXML($xml);
 411                         $doc2->preserveWhiteSpace = false;
 412                         $doc2->formatOutput = true;
 413                         $xml2 = $doc2->saveXML();
 414
 415                         $header['protocol'] = Conversation::PARCEL_SALMON;
 416                         $header['source'] = $xml2;
 417                         $header['direction'] = $direction;
 418                 } elseif (!$initialize) {
 419                         return false;
 420                 }
 421
 422                 // Fetch the first author
 423                 $authordata = $xpath->query('//author')->item(0);
 424                 $author = self::fetchAuthor($xpath, $authordata, $importer, $contact, $stored);
 425
 426                 // Reverse the order of the entries
 427                 $entrylist = [];
 428
 429                 foreach ($entries as $entry) {
 430                         $entrylist[] = $entry;
 431                 }
 432
 433                 foreach (array_reverse($entrylist) as $entry) {
 434                         // fetch the author
 435                         $authorelement = $xpath->query('/atom:entry/atom:author', $entry);
 436
 437                         if ($authorelement->length == 0) {
 438                                 $authorelement = $xpath->query('atom:author', $entry);
 439                         }
 440
 441                         if ($authorelement->length > 0) {
 442                                 $author = self::fetchAuthor($xpath, $entry, $importer, $contact, $stored);
 443                         }
 444
 445                         $item = array_merge($header, $author);
 446
 447                         $item['uri'] = XML::getFirstNodeValue($xpath, 'atom:id/text()', $entry);
 448                         $item['uri-id'] = ItemURI::insert(['uri' => $item['uri']]);
 449
 450                         $item['verb'] = XML::getFirstNodeValue($xpath, 'activity:verb/text()', $entry);
 451
 452                         // Delete a message
 453                         if (in_array($item['verb'], ['qvitter-delete-notice', Activity::DELETE, 'delete'])) {
 454                                 self::deleteNotice($item);
 455                                 continue;
 456                         }
 457
 458                         if (in_array($item['verb'], [Activity::O_UNFAVOURITE, Activity::UNFAVORITE])) {
 459                                 // Ignore "Unfavorite" message
 460                                 Logger::info('Ignore unfavorite message ', ['item' => $item]);
 461                                 continue;
 462                         }
 463
 464                         // Deletions come with the same uri, so we check for duplicates after processing deletions
 465                         if (Post::exists(['uid' => $importer['uid'], 'uri' => $item['uri']])) {
 466                                 Logger::info('Post with URI ' . $item['uri'] . ' already existed for user ' . $importer['uid'] . '.');
 467                                 continue;
 468                         } else {
 469                                 Logger::info('Processing post with URI ' .  $item['uri'] . ' for user ' . $importer['uid'] . '.');
 470                         }
 471
 472                         if ($item['verb'] == Activity::JOIN) {
 473                                 // ignore "Join" messages
 474                                 Logger::info('Ignore join message ', ['item' => $item]);
 475                                 continue;
 476                         }
 477
 478                         if ($item['verb'] == 'http://mastodon.social/schema/1.0/block') {
 479                                 // ignore mastodon "block" messages
 480                                 Logger::info('Ignore block message ', ['item' => $item]);
 481                                 continue;
 482                         }
 483
 484                         if ($item['verb'] == Activity::FOLLOW) {
 485                                 Contact::addRelationship($importer, $contact, $item);
 486                                 continue;
 487                         }
 488
 489                         if ($item['verb'] == Activity::O_UNFOLLOW) {
 490                                 $dummy = null;
 491                                 Contact::removeFollower($contact);
 492                                 continue;
 493                         }
 494
 495                         if ($item['verb'] == Activity::FAVORITE) {
 496                                 $orig_uri = $xpath->query('activity:object/atom:id', $entry)->item(0)->nodeValue;
 497                                 Logger::notice('Favorite', ['uri' => $orig_uri, 'item' => $item]);
 498
 499                                 $item['verb'] = Activity::LIKE;
 500                                 $item['thr-parent'] = $orig_uri;
 501                                 $item['gravity'] = Item::GRAVITY_ACTIVITY;
 502                                 $item['object-type'] = Activity\ObjectType::NOTE;
 503                         }
 504
 505                         // http://activitystrea.ms/schema/1.0/rsvp-yes
 506                         if (!in_array($item['verb'], [Activity::POST, Activity::LIKE, Activity::SHARE])) {
 507                                 Logger::info('Unhandled verb', ['verb' => $item['verb'], 'item' => $item]);
 508                         }
 509
 510                         self::processPost($xpath, $entry, $item, $importer);
 511
 512                         if ($initialize && (count(self::$itemlist) > 0)) {
 513                                 if (self::$itemlist[0]['uri'] == self::$itemlist[0]['thr-parent']) {
 514                                         $uid = self::$itemlist[0]['uid'];
 515                                         // We will import it everytime, when it is started by our contacts
 516                                         $valid = Contact::isSharingByURL(self::$itemlist[0]['author-link'], $uid);
 517
 518                                         if (!$valid) {
 519                                                 // If not, then it depends on this setting
 520                                                 $valid = !$uid || DI::pConfig()->get($uid, 'system', 'accept_only_sharer') != Item::COMPLETION_NONE;
 521
 522                                                 if ($valid) {
 523                                                         Logger::info('Item with URI ' . self::$itemlist[0]['uri'] . ' will be imported due to the system settings.');
 524                                                 }
 525                                         } else {
 526                                                 Logger::info('Item with URI ' . self::$itemlist[0]['uri'] . ' belongs to a contact (' . self::$itemlist[0]['contact-id'] . '). It will be imported.');
 527                                         }
 528
 529                                         if ($valid && DI::pConfig()->get($uid, 'system', 'accept_only_sharer') != Item::COMPLETION_LIKE) {
 530                                                 // Never post a thread when the only interaction by our contact was a like
 531                                                 $valid = false;
 532                                                 $verbs = [Activity::POST, Activity::SHARE];
 533                                                 foreach (self::$itemlist as $item) {
 534                                                         if (in_array($item['verb'], $verbs) && Contact::isSharingByURL($item['author-link'], $item['uid'])) {
 535                                                                 $valid = true;
 536                                                         }
 537                                                 }
 538                                                 if ($valid) {
 539                                                         Logger::info('Item with URI ' . self::$itemlist[0]['uri'] . ' will be imported since the thread contains posts or shares.');
 540                                                 }
 541                                         }
 542                                 } else {
 543                                         $valid = true;
 544                                 }
 545
 546                                 if ($valid) {
 547                                         $default_contact = 0;
 548                                         for ($key = count(self::$itemlist) - 1; $key >= 0; $key--) {
 549                                                 if (empty(self::$itemlist[$key]['contact-id'])) {
 550                                                         self::$itemlist[$key]['contact-id'] = $default_contact;
 551                                                 } else {
 552                                                         $default_contact = $item['contact-id'];
 553                                                 }
 554                                         }
 555                                         foreach (self::$itemlist as $item) {
 556                                                 $found = Post::exists(['uid' => $importer['uid'], 'uri' => $item['uri']]);
 557                                                 if ($found) {
 558                                                         Logger::notice('Item with URI ' . $item['uri'] . ' for user ' . $importer['uid'] . ' already exists.');
 559                                                 } elseif ($item['contact-id'] < 0) {
 560                                                         Logger::notice('Item with URI ' . $item['uri'] . ' is from a blocked contact.');
 561                                                 } else {
 562                                                         $ret = Item::insert($item);
 563                                                         Logger::info('Item with URI ' . $item['uri'] . ' for user ' . $importer['uid'] . ' stored. Return value: ' . $ret);
 564                                                 }
 565                                         }
 566                                 }
 567                                 self::$itemlist = [];
 568                         }
 569                         Logger::info('Processing done for post with URI ' . $item['uri'] . ' for user '.$importer['uid'] . '.');
 570                 }
 571                 return true;
 572         }
 573
 574         /**
 575          * Removes notice item from database
 576          *
 577          * @param array $item item
 578          * @return void
 579          * @throws \Exception
 580          */
 581         private static function deleteNotice(array $item)
 582         {
 583                 $condition = ['uid' => $item['uid'], 'author-id' => $item['author-id'], 'uri' => $item['uri']];
 584                 if (!Post::exists($condition)) {
 585                         Logger::notice('Item from ' . $item['author-link'] . ' with uri ' . $item['uri'] . ' for user ' . $item['uid'] . " wasn't found. We don't delete it.");
 586                         return;
 587                 }
 588
 589                 Item::markForDeletion($condition);
 590
 591                 Logger::notice('Deleted item with URI ' . $item['uri'] . ' for user ' . $item['uid']);
 592         }
 593
 594         /**
 595          * Processes the XML for a post
 596          *
 597          * @param DOMXPath $xpath    The xpath object
 598          * @param object   $entry    The xml entry that is processed
 599          * @param array    $item     The item array
 600          * @param array    $importer user record of the importing user
 601          * @return void
 602          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 603          * @throws \ImagickException
 604          */
 605         private static function processPost(DOMXPath $xpath, $entry, array &$item, array $importer)
 606         {
 607                 $item['body'] = HTML::toBBCode(XML::getFirstNodeValue($xpath, 'atom:content/text()', $entry));
 608                 $item['object-type'] = XML::getFirstNodeValue($xpath, 'activity:object-type/text()', $entry);
 609                 if (($item['object-type'] == Activity\ObjectType::BOOKMARK) || ($item['object-type'] == Activity\ObjectType::EVENT)) {
 610                         $item['title'] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
 611                         $item['body'] = XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry);
 612                 } elseif ($item['object-type'] == Activity\ObjectType::QUESTION) {
 613                         $item['title'] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
 614                 }
 615
 616                 $item['created'] = XML::getFirstNodeValue($xpath, 'atom:published/text()', $entry);
 617                 $item['edited'] = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $entry);
 618                 $item['conversation'] = XML::getFirstNodeValue($xpath, 'ostatus:conversation/text()', $entry);
 619
 620                 $conv = $xpath->query('ostatus:conversation', $entry);
 621                 if (is_object($conv->item(0))) {
 622                         foreach ($conv->item(0)->attributes as $attributes) {
 623                                 if ($attributes->name == 'ref') {
 624                                         $item['conversation'] = $attributes->textContent;
 625                                 }
 626                                 if ($attributes->name == 'href') {
 627                                         $item['conversation'] = $attributes->textContent;
 628                                 }
 629                         }
 630                 }
 631
 632                 $related = '';
 633
 634                 $inreplyto = $xpath->query('thr:in-reply-to', $entry);
 635                 if (is_object($inreplyto->item(0))) {
 636                         foreach ($inreplyto->item(0)->attributes as $attributes) {
 637                                 if ($attributes->name == 'ref') {
 638                                         $item['thr-parent'] = $attributes->textContent;
 639                                 }
 640                                 if ($attributes->name == 'href') {
 641                                         $related = $attributes->textContent;
 642                                 }
 643                         }
 644                 }
 645
 646                 $georsspoint = $xpath->query('georss:point', $entry);
 647                 if (!empty($georsspoint) && ($georsspoint->length > 0)) {
 648                         $item['coord'] = $georsspoint->item(0)->nodeValue;
 649                 }
 650
 651                 $categories = $xpath->query('atom:category', $entry);
 652                 if ($categories) {
 653                         foreach ($categories as $category) {
 654                                 foreach ($category->attributes as $attributes) {
 655                                         if ($attributes->name == 'term') {
 656                                                 // Store the hashtag
 657                                                 Tag::store($item['uri-id'], Tag::HASHTAG, $attributes->textContent);
 658                                         }
 659                                 }
 660                         }
 661                 }
 662
 663                 $self = '';
 664                 $add_body = '';
 665
 666                 $links = $xpath->query('atom:link', $entry);
 667                 if ($links) {
 668                         $link_data = self::processLinks($links, $item);
 669                         $self = $link_data['self'];
 670                         $add_body = $link_data['add_body'];
 671                 }
 672
 673                 $repeat_of = '';
 674
 675                 $notice_info = $xpath->query('statusnet:notice_info', $entry);
 676                 if ($notice_info && ($notice_info->length > 0)) {
 677                         foreach ($notice_info->item(0)->attributes as $attributes) {
 678                                 if ($attributes->name == 'source') {
 679                                         $item['app'] = strip_tags($attributes->textContent);
 680                                 }
 681                                 if ($attributes->name == 'repeat_of') {
 682                                         $repeat_of = $attributes->textContent;
 683                                 }
 684                         }
 685                 }
 686                 // Is it a repeated post?
 687                 if (($repeat_of != '') || ($item['verb'] == Activity::SHARE)) {
 688                         $link_data = self::processRepeatedItem($xpath, $entry, $item, $importer);
 689                         if (!empty($link_data['add_body'])) {
 690                                 $add_body .= $link_data['add_body'];
 691                         }
 692                 }
 693
 694                 $item['body'] .= $add_body;
 695
 696                 Tag::storeFromBody($item['uri-id'], $item['body']);
 697
 698                 // Mastodon Content Warning
 699                 if (($item['verb'] == Activity::POST) && $xpath->evaluate('boolean(atom:summary)', $entry)) {
 700                         $clear_text = XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry);
 701                         if (!empty($clear_text)) {
 702                                 $item['content-warning'] = HTML::toBBCode($clear_text);
 703                         }
 704                 }
 705
 706                 if (isset($item['thr-parent'])) {
 707                         if (!Post::exists(['uid' => $importer['uid'], 'uri' => $item['thr-parent']])) {
 708                                 if ($related != '') {
 709                                         self::fetchRelated($related, $item['thr-parent'], $importer);
 710                                 }
 711                         } else {
 712                                 Logger::info('Reply with URI ' . $item['uri'] . ' already existed for user ' . $importer['uid'] . '.');
 713                         }
 714                 } else {
 715                         $item['thr-parent'] = $item['uri'];
 716                         $item['gravity'] = Item::GRAVITY_PARENT;
 717                 }
 718
 719                 self::$itemlist[] = $item;
 720         }
 721
 722         /**
 723          * Fetch related posts and processes them
 724          *
 725          * @param string $related     The link to the related item
 726          * @param string $related_uri The related item in "uri" format
 727          * @param array  $importer    user record of the importing user
 728          * @return void
 729          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 730          * @throws \ImagickException
 731          */
 732         private static function fetchRelated(string $related, string $related_uri, array $importer)
 733         {
 734                 $stored = false;
 735                 $curlResult = DI::httpClient()->get($related, HttpClientAccept::ATOM_XML);
 736
 737                 if (!$curlResult->isSuccess() || empty($curlResult->getBody())) {
 738                         return;
 739                 }
 740
 741                 $xml = '';
 742
 743                 if ($curlResult->inHeader('Content-Type') &&
 744                         in_array('application/atom+xml', $curlResult->getHeader('Content-Type'))) {
 745                         Logger::info('Directly fetched XML for URI ' . $related_uri);
 746                         $xml = $curlResult->getBody();
 747                 }
 748
 749                 if ($xml == '') {
 750                         $doc = new DOMDocument();
 751                         if (!@$doc->loadHTML($curlResult->getBody())) {
 752                                 return;
 753                         }
 754                         $xpath = new DOMXPath($doc);
 755
 756                         $atom_file = '';
 757
 758                         $links = $xpath->query('//link');
 759                         if ($links) {
 760                                 foreach ($links as $link) {
 761                                         $attribute = self::readAttributes($link);
 762                                         if (($attribute['rel'] == 'alternate') && ($attribute['type'] == 'application/atom+xml')) {
 763                                                 $atom_file = $attribute['href'];
 764                                         }
 765                                 }
 766                                 if ($atom_file != '') {
 767                                         $curlResult = DI::httpClient()->get($atom_file, HttpClientAccept::ATOM_XML);
 768
 769                                         if ($curlResult->isSuccess()) {
 770                                                 Logger::info('Fetched XML for URI ' . $related_uri);
 771                                                 $xml = $curlResult->getBody();
 772                                         }
 773                                 }
 774                         }
 775                 }
 776
 777                 // Workaround for older GNU Social servers
 778                 if (($xml == '') && strstr($related, '/notice/')) {
 779                         $curlResult = DI::httpClient()->get(str_replace('/notice/', '/api/statuses/show/', $related) . '.atom', HttpClientAccept::ATOM_XML);
 780
 781                         if ($curlResult->isSuccess()) {
 782                                 Logger::info('GNU Social workaround to fetch XML for URI ' . $related_uri);
 783                                 $xml = $curlResult->getBody();
 784                         }
 785                 }
 786
 787                 // Even more worse workaround for GNU Social ;-)
 788                 if ($xml == '') {
 789                         $related_guess = self::convertHref($related_uri);
 790                         $curlResult = DI::httpClient()->get(str_replace('/notice/', '/api/statuses/show/', $related_guess) . '.atom', HttpClientAccept::ATOM_XML);
 791
 792                         if ($curlResult->isSuccess()) {
 793                                 Logger::info('GNU Social workaround 2 to fetch XML for URI ' . $related_uri);
 794                                 $xml = $curlResult->getBody();
 795                         }
 796                 }
 797
 798                 if ($xml != '') {
 799                         $hub = '';
 800                         self::process($xml, $importer, $contact, $hub, $stored, false, Conversation::PULL);
 801                 } else {
 802                         Logger::info('XML could not be fetched for URI: ' . $related_uri . ' - href: ' . $related);
 803                 }
 804                 return;
 805         }
 806
 807         /**
 808          * Processes the XML for a repeated post
 809          *
 810          * @param DOMXPath $xpath    The xpath object
 811          * @param object   $entry    The xml entry that is processed
 812          * @param array    $item     The item array
 813          * @param array    $importer user record of the importing user
 814          *
 815          * @return array with data from links
 816          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 817          * @throws \ImagickException
 818          */
 819         private static function processRepeatedItem(DOMXPath $xpath, $entry, array &$item, array $importer): array
 820         {
 821                 $activityobject = $xpath->query('activity:object', $entry)->item(0);
 822
 823                 if (!is_object($activityobject)) {
 824                         return [];
 825                 }
 826
 827                 $link_data = [];
 828
 829                 $orig_uri = XML::getFirstNodeValue($xpath, 'atom:id/text()', $activityobject);
 830
 831                 $links = $xpath->query('atom:link', $activityobject);
 832                 if ($links) {
 833                         $link_data = self::processLinks($links, $item);
 834                 }
 835
 836                 $orig_body = XML::getFirstNodeValue($xpath, 'atom:content/text()', $activityobject);
 837                 $orig_created = XML::getFirstNodeValue($xpath, 'atom:published/text()', $activityobject);
 838                 $orig_edited = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $activityobject);
 839
 840                 $orig_author = self::fetchAuthor($xpath, $activityobject, $importer, $dummy, false);
 841
 842                 $item['author-name'] = $orig_author['author-name'];
 843                 $item['author-link'] = $orig_author['author-link'];
 844                 $item['author-id'] = $orig_author['author-id'];
 845
 846                 $item['body'] = HTML::toBBCode($orig_body);
 847                 $item['created'] = $orig_created;
 848                 $item['edited'] = $orig_edited;
 849
 850                 $item['uri'] = $orig_uri;
 851
 852                 $item['verb'] = XML::getFirstNodeValue($xpath, 'activity:verb/text()', $activityobject);
 853
 854                 $item['object-type'] = XML::getFirstNodeValue($xpath, 'activity:object-type/text()', $activityobject);
 855
 856                 // Mastodon Content Warning
 857                 if (($item['verb'] == Activity::POST) && $xpath->evaluate('boolean(atom:summary)', $activityobject)) {
 858                         $clear_text = XML::getFirstNodeValue($xpath, 'atom:summary/text()', $activityobject);
 859                         if (!empty($clear_text)) {
 860                                 $item['content-warning'] = HTML::toBBCode($clear_text);
 861                         }
 862                 }
 863
 864                 $inreplyto = $xpath->query('thr:in-reply-to', $activityobject);
 865                 if (is_object($inreplyto->item(0))) {
 866                         foreach ($inreplyto->item(0)->attributes as $attributes) {
 867                                 if ($attributes->name == 'ref') {
 868                                         $item['thr-parent'] = $attributes->textContent;
 869                                 }
 870                         }
 871                 }
 872
 873                 return $link_data;
 874         }
 875
 876         /**
 877          * Processes links in the XML
 878          *
 879          * @param object $links The xml data that contain links
 880          * @param array  $item  The item array
 881          * @return array with data from the links
 882          */
 883         private static function processLinks($links, array &$item): array
 884         {
 885                 $link_data = ['add_body' => '', 'self' => ''];
 886
 887                 foreach ($links as $link) {
 888                         $attribute = self::readAttributes($link);
 889
 890                         if (!empty($attribute['rel']) && !empty($attribute['href'])) {
 891                                 switch ($attribute['rel']) {
 892                                         case 'alternate':
 893                                                 $item['plink'] = $attribute['href'];
 894                                                 if (($item['object-type'] == Activity\ObjectType::QUESTION)
 895                                                         || ($item['object-type'] == Activity\ObjectType::EVENT)
 896                                                 ) {
 897                                                         Post\Media::insert(['uri-id' => $item['uri-id'], 'type' => Post\Media::UNKNOWN,
 898                                                                 'url' => $attribute['href'], 'mimetype' => $attribute['type'] ?? null,
 899                                                                 'size' => $attribute['length'] ?? null, 'description' => $attribute['title'] ?? null]);
 900                                                 }
 901                                                 break;
 902
 903                                         case 'ostatus:conversation':
 904                                                 $link_data['conversation'] = $attribute['href'];
 905                                                 $item['conversation'] = $link_data['conversation'];
 906                                                 break;
 907
 908                                         case 'enclosure':
 909                                                 $filetype = strtolower(substr($attribute['type'], 0, strpos($attribute['type'], '/')));
 910                                                 if ($filetype == 'image') {
 911                                                         $link_data['add_body'] .= "\n[img]".$attribute['href'].'[/img]';
 912                                                 } else {
 913                                                         Post\Media::insert(['uri-id' => $item['uri-id'], 'type' => Post\Media::DOCUMENT,
 914                                                                 'url' => $attribute['href'], 'mimetype' => $attribute['type'],
 915                                                                 'size' => $attribute['length'] ?? null, 'description' => $attribute['title'] ?? null]);
 916                                                 }
 917                                                 break;
 918
 919                                         case 'related':
 920                                                 if ($item['object-type'] != Activity\ObjectType::BOOKMARK) {
 921                                                         if (!isset($item['thr-parent'])) {
 922                                                                 $item['thr-parent'] = $attribute['href'];
 923                                                         }
 924                                                         $link_data['related'] = $attribute['href'];
 925                                                 } else {
 926                                                         Post\Media::insert(['uri-id' => $item['uri-id'], 'type' => Post\Media::UNKNOWN,
 927                                                                 'url' => $attribute['href'], 'mimetype' => $attribute['type'] ?? null,
 928                                                                 'size' => $attribute['length'] ?? null, 'description' => $attribute['title'] ?? null]);
 929                                                 }
 930                                                 break;
 931
 932                                         case 'self':
 933                                                 if (empty($item['plink'])) {
 934                                                         $item['plink'] = $attribute['href'];
 935                                                 }
 936                                                 $link_data['self'] = $attribute['href'];
 937                                                 break;
 938
 939                                         default:
 940                                                 Logger::notice('Unsupported rel=' . $attribute['rel'] . ', href=' . $attribute['href'] . ', object-type=' . $item['object-type']);
 941                                 }
 942                         }
 943                 }
 944                 return $link_data;
 945         }
 946
 947         /**
 948          * Create an url out of an uri
 949          *
 950          * @param string $href URI in the format "parameter1:parameter1:..."
 951          * @return string URL in the format http(s)://....
 952          */
 953         private static function convertHref(string $href): string
 954         {
 955                 $elements = explode(':', $href);
 956
 957                 if ((count($elements) <= 2) || ($elements[0] != 'tag')) {
 958                         return $href;
 959                 }
 960
 961                 $server = explode(',', $elements[1]);
 962                 $conversation = explode('=', $elements[2]);
 963
 964                 if ((count($elements) == 4) && ($elements[2] == 'post')) {
 965                         return 'http://' . $server[0] . '/notice/' . $elements[3];
 966                 }
 967
 968                 if ((count($conversation) != 2) || ($conversation[1] == '')) {
 969                         return $href;
 970                 }
 971
 972                 if ($elements[3] == 'objectType=thread') {
 973                         return 'http://' . $server[0] . '/conversation/' . $conversation[1];
 974                 } else {
 975                         return 'http://' . $server[0] . '/notice/' . $conversation[1];
 976                 }
 977         }
 978
 979         /**
 980          * Adds the header elements to the XML document
 981          *
 982          * @param DOMDocument $doc       XML document
 983          * @param array       $owner     Contact data of the poster
 984          * @param string      $filter    The related feed filter (activity, posts or comments)
 985          *
 986          * @return DOMElement Header root element
 987          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 988          */
 989         private static function addHeader(DOMDocument $doc, array $owner, string $filter): DOMElement
 990         {
 991                 $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 992                 $doc->appendChild($root);
 993
 994                 $root->setAttribute('xmlns:thr', ActivityNamespace::THREAD);
 995                 $root->setAttribute('xmlns:georss', ActivityNamespace::GEORSS);
 996                 $root->setAttribute('xmlns:activity', ActivityNamespace::ACTIVITY);
 997                 $root->setAttribute('xmlns:media', ActivityNamespace::MEDIA);
 998                 $root->setAttribute('xmlns:poco', ActivityNamespace::POCO);
 999                 $root->setAttribute('xmlns:ostatus', ActivityNamespace::OSTATUS);
1000                 $root->setAttribute('xmlns:statusnet', ActivityNamespace::STATUSNET);
1001                 $root->setAttribute('xmlns:mastodon', ActivityNamespace::MASTODON);
1002
1003                 $title = '';
1004                 $selfUri = '/feed/' . $owner['nick'] . '/';
1005                 switch ($filter) {
1006                         case 'activity':
1007                                 $title = DI::l10n()->t('%s\'s timeline', $owner['name']);
1008                                 $selfUri .= $filter;
1009                                 break;
1010
1011                         case 'posts':
1012                                 $title = DI::l10n()->t('%s\'s posts', $owner['name']);
1013                                 break;
1014
1015                         case 'comments':
1016                                 $title = DI::l10n()->t('%s\'s comments', $owner['name']);
1017                                 $selfUri .= $filter;
1018                                 break;
1019                 }
1020
1021                 $selfUri = '/dfrn_poll/' . $owner['nick'];
1022
1023                 $attributes = [
1024                         'uri' => 'https://friendi.ca',
1025                         'version' => App::VERSION . '-' . DB_UPDATE_VERSION,
1026                 ];
1027                 XML::addElement($doc, $root, 'generator', App::PLATFORM, $attributes);
1028                 XML::addElement($doc, $root, 'id', DI::baseUrl() . '/profile/' . $owner['nick']);
1029                 XML::addElement($doc, $root, 'title', $title);
1030                 XML::addElement($doc, $root, 'subtitle', sprintf("Updates from %s on %s", $owner['name'], DI::config()->get('config', 'sitename')));
1031                 XML::addElement($doc, $root, 'logo', User::getAvatarUrl($owner, Proxy::SIZE_SMALL));
1032                 XML::addElement($doc, $root, 'updated', DateTimeFormat::utcNow(DateTimeFormat::ATOM));
1033
1034                 $author = self::addAuthor($doc, $owner, true);
1035                 $root->appendChild($author);
1036
1037                 $attributes = [
1038                         'href' => $owner['url'],
1039                         'rel' => 'alternate',
1040                         'type' => 'text/html',
1041                 ];
1042                 XML::addElement($doc, $root, 'link', '', $attributes);
1043
1044                 /// @TODO We have to find out what this is
1045                 /// $attributes = array("href" => DI::baseUrl()."/sup",
1046                 ///             "rel" => "http://api.friendfeed.com/2008/03#sup",
1047                 ///             "type" => "application/json");
1048                 /// XML::addElement($doc, $root, "link", "", $attributes);
1049
1050                 self::addHubLink($doc, $root, $owner['nick']);
1051
1052                 $attributes = ['href' => DI::baseUrl() . '/salmon/' . $owner['nick'], 'rel' => 'salmon'];
1053                 XML::addElement($doc, $root, 'link', '', $attributes);
1054
1055                 $attributes = ['href' => DI::baseUrl() . '/salmon/' . $owner['nick'], 'rel' => 'http://salmon-protocol.org/ns/salmon-replies'];
1056                 XML::addElement($doc, $root, 'link', '', $attributes);
1057
1058                 $attributes = ['href' => DI::baseUrl() . '/salmon/' . $owner['nick'], 'rel' => 'http://salmon-protocol.org/ns/salmon-mention'];
1059                 XML::addElement($doc, $root, 'link', '', $attributes);
1060
1061                 $attributes = ['href' => DI::baseUrl() . $selfUri, 'rel' => 'self', 'type' => 'application/atom+xml'];
1062                 XML::addElement($doc, $root, 'link', '', $attributes);
1063
1064                 if ($owner['contact-type'] == Contact::TYPE_COMMUNITY) {
1065                         $members = DBA::count('contact', [
1066                                 'uid'     => $owner['uid'],
1067                                 'self'    => false,
1068                                 'pending' => false,
1069                                 'archive' => false,
1070                                 'hidden'  => false,
1071                                 'blocked' => false,
1072                         ]);
1073                         XML::addElement($doc, $root, 'statusnet:group_info', '', ['member_count' => $members]);
1074                 }
1075
1076                 return $root;
1077         }
1078
1079         /**
1080          * Add the link to the push hubs to the XML document
1081          *
1082          * @param DOMDocument $doc  XML document
1083          * @param DOMElement  $root XML root element where the hub links are added
1084          * @param string      $nick Nickname
1085          * @return void
1086          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1087          */
1088         public static function addHubLink(DOMDocument $doc, DOMElement $root, string $nick)
1089         {
1090                 $h = DI::baseUrl() . '/pubsubhubbub/' . $nick;
1091                 XML::addElement($doc, $root, 'link', '', ['href' => $h, 'rel' => 'hub']);
1092         }
1093
1094         /**
1095          * Adds attachment data to the XML document
1096          *
1097          * @param DOMDocument $doc  XML document
1098          * @param DOMElement  $root XML root element where the hub links are added
1099          * @param array       $item Data of the item that is to be posted
1100          * @return void
1101          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1102          */
1103         public static function getAttachment(DOMDocument $doc, DOMElement $root, array $item)
1104         {
1105                 foreach (Post\Media::getByURIId($item['uri-id'], [Post\Media::AUDIO, Post\Media::IMAGE, Post\Media::VIDEO, Post\Media::DOCUMENT, Post\Media::TORRENT]) as $attachment) {
1106                         $attributes = ['rel' => 'enclosure',
1107                                 'href' => $attachment['url'],
1108                                 'type' => $attachment['mimetype']];
1109
1110                         if (!empty($attachment['size'])) {
1111                                 $attributes['length'] = intval($attachment['size']);
1112                         }
1113                         if (!empty($attachment['description'])) {
1114                                 $attributes['title'] = $attachment['description'];
1115                         }
1116
1117                         XML::addElement($doc, $root, 'link', '', $attributes);
1118                 }
1119         }
1120
1121         /**
1122          * Adds the author element to the XML document
1123          *
1124          * @param DOMDocument $doc          XML document
1125          * @param array       $owner        Contact data of the poster
1126          * @param bool        $show_profile Whether to show profile
1127          * @return DOMElement Author element
1128          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1129          */
1130         private static function addAuthor(DOMDocument $doc, array $owner, bool $show_profile = true): DOMElement
1131         {
1132                 $profile = DBA::selectFirst('profile', ['homepage', 'publish'], ['uid' => $owner['uid']]);
1133                 $author = $doc->createElement('author');
1134                 XML::addElement($doc, $author, 'id', $owner['url']);
1135                 if ($owner['contact-type'] == Contact::TYPE_COMMUNITY) {
1136                         XML::addElement($doc, $author, 'activity:object-type', Activity\ObjectType::GROUP);
1137                 } else {
1138                         XML::addElement($doc, $author, 'activity:object-type', Activity\ObjectType::PERSON);
1139                 }
1140
1141                 XML::addElement($doc, $author, 'uri', $owner['url']);
1142                 XML::addElement($doc, $author, 'name', $owner['nick']);
1143                 XML::addElement($doc, $author, 'email', $owner['addr']);
1144                 if ($show_profile) {
1145                         XML::addElement($doc, $author, 'summary', BBCode::convertForUriId($owner['uri-id'], $owner['about'], BBCode::OSTATUS));
1146                 }
1147
1148                 $attributes = [
1149                         'rel' => 'alternate',
1150                         'type' => 'text/html',
1151                         'href' => $owner['url'],
1152                 ];
1153                 XML::addElement($doc, $author, 'link', '', $attributes);
1154
1155                 $attributes = [
1156                         'rel' => 'avatar',
1157                         'type' => 'image/jpeg', // To-Do?
1158                         'media:width' => Proxy::PIXEL_SMALL,
1159                         'media:height' => Proxy::PIXEL_SMALL,
1160                         'href' => User::getAvatarUrl($owner, Proxy::SIZE_SMALL),
1161                 ];
1162                 XML::addElement($doc, $author, 'link', '', $attributes);
1163
1164                 if (isset($owner['thumb'])) {
1165                         $attributes = [
1166                                 'rel' => 'avatar',
1167                                 'type' => 'image/jpeg', // To-Do?
1168                                 'media:width' => Proxy::PIXEL_THUMB,
1169                                 'media:height' => Proxy::PIXEL_THUMB,
1170                                 'href' => User::getAvatarUrl($owner, Proxy::SIZE_THUMB),
1171                         ];
1172                         XML::addElement($doc, $author, 'link', '', $attributes);
1173                 }
1174
1175                 XML::addElement($doc, $author, 'poco:preferredUsername', $owner['nick']);
1176                 XML::addElement($doc, $author, 'poco:displayName', $owner['name']);
1177                 if ($show_profile) {
1178                         XML::addElement($doc, $author, 'poco:note', BBCode::convertForUriId($owner['uri-id'], $owner['about'], BBCode::OSTATUS));
1179
1180                         if (trim($owner['location']) != '') {
1181                                 $element = $doc->createElement('poco:address');
1182                                 XML::addElement($doc, $element, 'poco:formatted', $owner['location']);
1183                                 $author->appendChild($element);
1184                         }
1185                 }
1186
1187                 if (DBA::isResult($profile) && !$show_profile) {
1188                         if (trim($profile['homepage']) != '') {
1189                                 $urls = $doc->createElement('poco:urls');
1190                                 XML::addElement($doc, $urls, 'poco:type', 'homepage');
1191                                 XML::addElement($doc, $urls, 'poco:value', $profile['homepage']);
1192                                 XML::addElement($doc, $urls, 'poco:primary', 'true');
1193                                 $author->appendChild($urls);
1194                         }
1195
1196                         XML::addElement($doc, $author, 'followers', '', ['url' => DI::baseUrl() . '/profile/' . $owner['nick'] . '/contacts/followers']);
1197                         XML::addElement($doc, $author, 'statusnet:profile_info', '', ['local_id' => $owner['uid']]);
1198
1199                         if ($profile['publish']) {
1200                                 XML::addElement($doc, $author, 'mastodon:scope', 'public');
1201                         }
1202                 }
1203
1204                 return $author;
1205         }
1206
1207         /**
1208          * @TODO Picture attachments should look like this:
1209          *      <a href="https://status.pirati.ca/attachment/572819" title="https://status.pirati.ca/file/heluecht-20151202T222602-rd3u49p.gif"
1210          *      class="attachment thumbnail" id="attachment-572819" rel="nofollow external">https://status.pirati.ca/attachment/572819</a>
1211          */
1212
1213         /**
1214          * Returns the given activity if present - otherwise returns the "post" activity
1215          *
1216          * @param array $item Data of the item that is to be posted
1217          * @return string activity
1218          */
1219         public static function constructVerb(array $item): string
1220         {
1221                 if (!empty($item['verb'])) {
1222                         return $item['verb'];
1223                 }
1224
1225                 return Activity::POST;
1226         }
1227
1228         /**
1229          * Returns the given object type if present - otherwise returns the "note" object type
1230          *
1231          * @param array $item Data of the item that is to be posted
1232          * @return string Object type
1233          */
1234         private static function constructObjecttype(array $item): string
1235         {
1236                 if (!empty($item['object-type']) && in_array($item['object-type'], [Activity\ObjectType::NOTE, Activity\ObjectType::COMMENT])) {
1237                         return $item['object-type'];
1238                 }
1239
1240                 return Activity\ObjectType::NOTE;
1241         }
1242
1243         /**
1244          * Adds an entry element to the XML document
1245          *
1246          * @param DOMDocument $doc       XML document
1247          * @param array       $item      Data of the item that is to be posted
1248          * @param array       $owner     Contact data of the poster
1249          * @param bool        $toplevel  optional default false
1250          *
1251          * @return DOMElement Entry element
1252          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1253          * @throws \ImagickException
1254          */
1255         private static function entry(DOMDocument $doc, array $item, array $owner, bool $toplevel = false): DOMElement
1256         {
1257                 if ($item['verb'] == Activity::LIKE) {
1258                         return self::likeEntry($doc, $item, $owner, $toplevel);
1259                 } elseif (in_array($item['verb'], [Activity::FOLLOW, Activity::O_UNFOLLOW])) {
1260                         return self::followEntry($doc, $item, $owner, $toplevel);
1261                 } else {
1262                         return self::noteEntry($doc, $item, $owner, $toplevel);
1263                 }
1264         }
1265
1266         /**
1267          * Adds an entry element with a "like"
1268          *
1269          * @param DOMDocument $doc      XML document
1270          * @param array       $item     Data of the item that is to be posted
1271          * @param array       $owner    Contact data of the poster
1272          * @param bool        $toplevel Is it for en entry element (false) or a feed entry (true)?
1273          * @return DOMElement Entry element with "like"
1274          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1275          * @throws \ImagickException
1276          */
1277         private static function likeEntry(DOMDocument $doc, array $item, array $owner, bool $toplevel): DOMElement
1278         {
1279                 if (($item['gravity'] != Item::GRAVITY_PARENT) && (Strings::normaliseLink($item['author-link']) != Strings::normaliseLink($owner['url']))) {
1280                         Logger::info('OStatus entry is from author ' . $owner['url'] . ' - not from ' . $item['author-link'] . '. Quitting.');
1281                 }
1282
1283                 $entry = self::entryHeader($doc, $owner, $item, $toplevel);
1284
1285                 $verb = ActivityNamespace::ACTIVITY_SCHEMA . 'favorite';
1286                 self::entryContent($doc, $entry, $item, $owner, 'Favorite', $verb, false);
1287
1288                 $parent = Post::selectFirst([], ['uri' => $item['thr-parent'], 'uid' => $item['uid']]);
1289                 if (DBA::isResult($parent)) {
1290                         $as_object = $doc->createElement('activity:object');
1291
1292                         XML::addElement($doc, $as_object, 'activity:object-type', self::constructObjecttype($parent));
1293
1294                         self::entryContent($doc, $as_object, $parent, $owner, 'New entry');
1295
1296                         $entry->appendChild($as_object);
1297                 }
1298
1299                 self::entryFooter($doc, $entry, $item, $owner);
1300
1301                 return $entry;
1302         }
1303
1304         /**
1305          * Adds the person object element to the XML document
1306          *
1307          * @param DOMDocument $doc     XML document
1308          * @param array       $owner   Contact data of the poster
1309          * @param array       $contact Contact data of the target
1310          * @return DOMElement author element
1311          */
1312         private static function addPersonObject(DOMDocument $doc, array $owner, array $contact): DOMElement
1313         {
1314                 $object = $doc->createElement('activity:object');
1315                 XML::addElement($doc, $object, 'activity:object-type', Activity\ObjectType::PERSON);
1316
1317                 if ($contact['network'] == Protocol::PHANTOM) {
1318                         XML::addElement($doc, $object, 'id', $contact['url']);
1319                         return $object;
1320                 }
1321
1322                 XML::addElement($doc, $object, 'id', $contact['alias']);
1323                 XML::addElement($doc, $object, 'title', $contact['nick']);
1324
1325                 XML::addElement($doc, $object, 'link', '', [
1326                         'rel' => 'alternate',
1327                         'type' => 'text/html',
1328                         'href' => $contact['url'],
1329                 ]);
1330
1331                 $attributes = [
1332                         'rel' => 'avatar',
1333                         'type' => 'image/jpeg', // To-Do?
1334                         'media:width' => 300,
1335                         'media:height' => 300,
1336                         'href' => $contact['photo'],
1337                 ];
1338                 XML::addElement($doc, $object, 'link', '', $attributes);
1339
1340                 XML::addElement($doc, $object, 'poco:preferredUsername', $contact['nick']);
1341                 XML::addElement($doc, $object, 'poco:displayName', $contact['name']);
1342
1343                 if (trim($contact['location']) != '') {
1344                         $element = $doc->createElement('poco:address');
1345                         XML::addElement($doc, $element, 'poco:formatted', $contact['location']);
1346                         $object->appendChild($element);
1347                 }
1348
1349                 return $object;
1350         }
1351
1352         /**
1353          * Adds a follow/unfollow entry element
1354          *
1355          * @param DOMDocument $doc      XML document
1356          * @param array       $item     Data of the follow/unfollow message
1357          * @param array       $owner    Contact data of the poster
1358          * @param bool        $toplevel Is it for en entry element (false) or a feed entry (true)?
1359          * @return DOMElement Entry element
1360          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1361          * @throws \ImagickException
1362          */
1363         private static function followEntry(DOMDocument $doc, array $item, array $owner, bool $toplevel): DOMElement
1364         {
1365                 $item['id'] = $item['parent'] = 0;
1366                 $item['created'] = $item['edited'] = date('c');
1367                 $item['private'] = Item::PRIVATE;
1368
1369                 $contact = Contact::getByURL($item['follow']);
1370                 $item['follow'] = $contact['url'];
1371
1372                 if ($contact['alias']) {
1373                         $item['follow'] = $contact['alias'];
1374                 } else {
1375                         $contact['alias'] = $contact['url'];
1376                 }
1377
1378                 $condition = ['uid' => $owner['uid'], 'nurl' => Strings::normaliseLink($contact['url'])];
1379                 $user_contact = DBA::selectFirst('contact', ['id'], $condition);
1380
1381                 if (DBA::isResult($user_contact)) {
1382                         $connect_id = $user_contact['id'];
1383                 } else {
1384                         $connect_id = 0;
1385                 }
1386
1387                 if ($item['verb'] == Activity::FOLLOW) {
1388                         $message = DI::l10n()->t('%s is now following %s.');
1389                         $title = DI::l10n()->t('following');
1390                         $action = 'subscription';
1391                 } else {
1392                         $message = DI::l10n()->t('%s stopped following %s.');
1393                         $title = DI::l10n()->t('stopped following');
1394                         $action = 'unfollow';
1395                 }
1396
1397                 $item['uri'] = $item['parent-uri'] = $item['thr-parent']
1398                                 = 'tag:' . DI::baseUrl()->getHostname().
1399                                 ','.date('Y-m-d').':'.$action.':'.$owner['uid'].
1400                                 ':person:'.$connect_id.':'.$item['created'];
1401
1402                 $item['body'] = sprintf($message, $owner['nick'], $contact['nick']);
1403
1404                 $entry = self::entryHeader($doc, $owner, $item, $toplevel);
1405
1406                 self::entryContent($doc, $entry, $item, $owner, $title);
1407
1408                 $object = self::addPersonObject($doc, $owner, $contact);
1409                 $entry->appendChild($object);
1410
1411                 self::entryFooter($doc, $entry, $item, $owner);
1412
1413                 return $entry;
1414         }
1415
1416         /**
1417          * Adds a regular entry element
1418          *
1419          * @param DOMDocument $doc       XML document
1420          * @param array       $item      Data of the item that is to be posted
1421          * @param array       $owner     Contact data of the poster
1422          * @param bool        $toplevel  Is it for en entry element (false) or a feed entry (true)?
1423          * @return DOMElement Entry element
1424          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1425          * @throws \ImagickException
1426          */
1427         private static function noteEntry(DOMDocument $doc, array $item, array $owner, bool $toplevel): DOMElement
1428         {
1429                 if (($item['gravity'] != Item::GRAVITY_PARENT) && (Strings::normaliseLink($item['author-link']) != Strings::normaliseLink($owner['url']))) {
1430                         Logger::info('OStatus entry is from author ' . $owner['url'] . ' - not from ' . $item['author-link'] . '. Quitting.');
1431                 }
1432
1433                 if (!$toplevel) {
1434                         if (!empty($item['title'])) {
1435                                 $title = BBCode::convertForUriId($item['uri-id'], $item['title'], BBCode::OSTATUS);
1436                         } else {
1437                                 $title = sprintf('New note by %s', $owner['nick']);
1438                         }
1439                 } else {
1440                         $title = sprintf('New comment by %s', $owner['nick']);
1441                 }
1442
1443                 $entry = self::entryHeader($doc, $owner, $item, $toplevel);
1444
1445                 XML::addElement($doc, $entry, 'activity:object-type', Activity\ObjectType::NOTE);
1446
1447                 self::entryContent($doc, $entry, $item, $owner, $title, '', true);
1448
1449                 self::entryFooter($doc, $entry, $item, $owner, true);
1450
1451                 return $entry;
1452         }
1453
1454         /**
1455          * Adds a header element to the XML document
1456          *
1457          * @param DOMDocument $doc      XML document
1458          * @param array       $owner    Contact data of the poster
1459          * @param array       $item
1460          * @param bool        $toplevel Is it for en entry element (false) or a feed entry (true)?
1461          * @return DOMElement The entry element where the elements are added
1462          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1463          * @throws \ImagickException
1464          */
1465         public static function entryHeader(DOMDocument $doc, array $owner, array $item, bool $toplevel): DOMElement
1466         {
1467                 if (!$toplevel) {
1468                         $entry = $doc->createElement('entry');
1469
1470                         if ($owner['contact-type'] == Contact::TYPE_COMMUNITY) {
1471                                 $contact = Contact::getByURL($item['author-link']) ?: $owner;
1472                                 $contact['nickname'] = $contact['nickname'] ?? $contact['nick'];
1473                                 $author = self::addAuthor($doc, $contact, false);
1474                                 $entry->appendChild($author);
1475                         }
1476                 } else {
1477                         $entry = $doc->createElementNS(ActivityNamespace::ATOM1, 'entry');
1478
1479                         $entry->setAttribute('xmlns:thr', ActivityNamespace::THREAD);
1480                         $entry->setAttribute('xmlns:georss', ActivityNamespace::GEORSS);
1481                         $entry->setAttribute('xmlns:activity', ActivityNamespace::ACTIVITY);
1482                         $entry->setAttribute('xmlns:media', ActivityNamespace::MEDIA);
1483                         $entry->setAttribute('xmlns:poco', ActivityNamespace::POCO);
1484                         $entry->setAttribute('xmlns:ostatus', ActivityNamespace::OSTATUS);
1485                         $entry->setAttribute('xmlns:statusnet', ActivityNamespace::STATUSNET);
1486                         $entry->setAttribute('xmlns:mastodon', ActivityNamespace::MASTODON);
1487
1488                         $author = self::addAuthor($doc, $owner);
1489                         $entry->appendChild($author);
1490                 }
1491
1492                 return $entry;
1493         }
1494
1495         /**
1496          * Adds elements to the XML document
1497          *
1498          * @param DOMDocument $doc       XML document
1499          * @param DOMElement  $entry     Entry element where the content is added
1500          * @param array       $item      Data of the item that is to be posted
1501          * @param array       $owner     Contact data of the poster
1502          * @param string      $title     Title for the post
1503          * @param string      $verb      The activity verb
1504          * @param bool        $complete  Add the "status_net" element?
1505          * @return void
1506          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1507          */
1508         private static function entryContent(DOMDocument $doc, DOMElement $entry, array $item, array $owner, string $title, string $verb = '', bool $complete = true)
1509         {
1510                 if ($verb == '') {
1511                         $verb = self::constructVerb($item);
1512                 }
1513
1514                 XML::addElement($doc, $entry, 'id', $item['uri']);
1515                 XML::addElement($doc, $entry, 'title', html_entity_decode($title, ENT_QUOTES, 'UTF-8'));
1516
1517                 $body = Post\Media::addAttachmentsToBody($item['uri-id'], DI::contentItem()->addSharedPost($item));
1518
1519                 if (!empty($item['title'])) {
1520                         $body = '[b]' . $item['title'] . "[/b]\n\n" . $body;
1521                 }
1522
1523                 $body = BBCode::convertForUriId($item['uri-id'], $body, BBCode::OSTATUS);
1524
1525                 XML::addElement($doc, $entry, 'content', $body, ['type' => 'html']);
1526
1527                 XML::addElement($doc, $entry, 'link', '', [
1528                         'rel' => 'alternate',
1529                         'type' => 'text/html',
1530                         'href' => DI::baseUrl() . '/display/' . $item['guid'],
1531                 ]);
1532
1533                 if ($complete && ($item['id'] > 0)) {
1534                         XML::addElement($doc, $entry, 'status_net', '', ['notice_id' => $item['id']]);
1535                 }
1536
1537                 XML::addElement($doc, $entry, 'activity:verb', $verb);
1538
1539                 XML::addElement($doc, $entry, 'published', DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM));
1540                 XML::addElement($doc, $entry, 'updated', DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM));
1541         }
1542
1543         /**
1544          * Adds the elements at the foot of an entry to the XML document
1545          *
1546          * @param DOMDocument $doc       XML document
1547          * @param object      $entry     The entry element where the elements are added
1548          * @param array       $item      Data of the item that is to be posted
1549          * @param array       $owner     Contact data of the poster
1550          * @param bool        $complete  default true
1551          * @return void
1552          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1553          */
1554         private static function entryFooter(DOMDocument $doc, $entry, array $item, array $owner, bool $complete = true)
1555         {
1556                 $mentioned = [];
1557
1558                 if ($item['gravity'] != Item::GRAVITY_PARENT) {
1559                         $parent = Post::selectFirst(['guid', 'author-link', 'owner-link'], ['id' => $item['parent']]);
1560
1561                         $thrparent = Post::selectFirst(['guid', 'author-link', 'owner-link', 'plink'], ['uid' => $owner['uid'], 'uri' => $item['thr-parent']]);
1562
1563                         if (DBA::isResult($thrparent)) {
1564                                 $mentioned[$thrparent['author-link']] = $thrparent['author-link'];
1565                                 $mentioned[$thrparent['owner-link']]  = $thrparent['owner-link'];
1566                                 $parent_plink                         = $thrparent['plink'];
1567                         } elseif (DBA::isResult($parent)) {
1568                                 $mentioned[$parent['author-link']] = $parent['author-link'];
1569                                 $mentioned[$parent['owner-link']]  = $parent['owner-link'];
1570                                 $parent_plink                      = DI::baseUrl() . '/display/' . $parent['guid'];
1571                         } else {
1572                                 DI::logger()->notice('Missing parent and thr-parent for child item', ['item' => $item]);
1573                         }
1574
1575                         if (isset($parent_plink)) {
1576                                 $attributes = [
1577                                         'ref'  => $item['thr-parent'],
1578                                         'href' => $parent_plink];
1579                                 XML::addElement($doc, $entry, 'thr:in-reply-to', '', $attributes);
1580
1581                                 $attributes = [
1582                                         'rel'  => 'related',
1583                                         'href' => $parent_plink];
1584                                 XML::addElement($doc, $entry, 'link', '', $attributes);
1585                         }
1586                 }
1587
1588                 if (intval($item['parent']) > 0) {
1589                         $conversation_href = $conversation_uri = $item['conversation'];
1590
1591                         XML::addElement($doc, $entry, 'link', '', ['rel' => 'ostatus:conversation', 'href' => $conversation_href]);
1592
1593                         $attributes = [
1594                                 'href' => $conversation_href,
1595                                 'local_id' => $item['parent'],
1596                                 'ref' => $conversation_uri,
1597                         ];
1598
1599                         XML::addElement($doc, $entry, 'ostatus:conversation', $conversation_uri, $attributes);
1600                 }
1601
1602                 // uri-id isn't present for follow entry pseudo-items
1603                 $tags = Tag::getByURIId($item['uri-id'] ?? 0);
1604                 foreach ($tags as $tag) {
1605                         $mentioned[$tag['url']] = $tag['url'];
1606                 }
1607
1608                 // Make sure that mentions are accepted (GNU Social has problems with mixing HTTP and HTTPS)
1609                 $newmentions = [];
1610                 foreach ($mentioned as $mention) {
1611                         $newmentions[str_replace('http://', 'https://', $mention)] = str_replace('http://', 'https://', $mention);
1612                         $newmentions[str_replace('https://', 'http://', $mention)] = str_replace('https://', 'http://', $mention);
1613                 }
1614                 $mentioned = $newmentions;
1615
1616                 foreach ($mentioned as $mention) {
1617                         $contact = Contact::getByURL($mention, false, ['contact-type']);
1618                         if (!empty($contact) && ($contact['contact-type'] == Contact::TYPE_COMMUNITY)) {
1619                                 XML::addElement($doc, $entry, 'link', '', [
1620                                         'rel' => 'mentioned',
1621                                         'ostatus:object-type' => Activity\ObjectType::GROUP,
1622                                         'href' => $mention,
1623                                 ]);
1624                         } else {
1625                                 XML::addElement($doc, $entry, 'link', '', [
1626                                         'rel' => 'mentioned',
1627                                         'ostatus:object-type' => Activity\ObjectType::PERSON,
1628                                                 'href' => $mention,
1629                                 ]);
1630                         }
1631                 }
1632
1633                 if ($owner['contact-type'] == Contact::TYPE_COMMUNITY) {
1634                         XML::addElement($doc, $entry, 'link', '', [
1635                                 'rel' => 'mentioned',
1636                                 'ostatus:object-type' => 'http://activitystrea.ms/schema/1.0/group',
1637                                 'href' => $owner['url']
1638                         ]);
1639                 }
1640
1641                 if ($item['private'] != Item::PRIVATE) {
1642                         XML::addElement($doc, $entry, 'link', '', ['rel' => 'ostatus:attention',
1643                                                                         'href' => 'http://activityschema.org/collection/public']);
1644                         XML::addElement($doc, $entry, 'link', '', ['rel' => 'mentioned',
1645                                                                         'ostatus:object-type' => 'http://activitystrea.ms/schema/1.0/collection',
1646                                                                         'href' => 'http://activityschema.org/collection/public']);
1647                         XML::addElement($doc, $entry, 'mastodon:scope', 'public');
1648                 }
1649
1650                 foreach ($tags as $tag) {
1651                         if ($tag['type'] == Tag::HASHTAG) {
1652                                 XML::addElement($doc, $entry, 'category', '', ['term' => $tag['name']]);
1653                         }
1654                 }
1655
1656                 self::getAttachment($doc, $entry, $item);
1657
1658                 if ($complete && ($item['id'] > 0)) {
1659                         $app = $item['app'];
1660                         if ($app == '') {
1661                                 $app = 'web';
1662                         }
1663
1664                         $attributes = ['local_id' => $item['id'], 'source' => $app];
1665
1666                         if (isset($parent['id'])) {
1667                                 $attributes['repeat_of'] = $parent['id'];
1668                         }
1669
1670                         if ($item['coord'] != '') {
1671                                 XML::addElement($doc, $entry, 'georss:point', $item['coord']);
1672                         }
1673
1674                         XML::addElement($doc, $entry, 'statusnet:notice_info', '', $attributes);
1675                 }
1676         }
1677
1678         /**
1679          * Creates the XML feed for a given nickname
1680          *
1681          * Supported filters:
1682          * - activity (default): all the public posts
1683          * - posts: all the public top-level posts
1684          * - comments: all the public replies
1685          *
1686          * Updates the provided last_update parameter if the result comes from the
1687          * cache or it is empty
1688          *
1689          * @param string  $owner_nick  Nickname of the feed owner
1690          * @param string  $last_update Date of the last update (in "Y-m-d H:i:s" format)
1691          * @param integer $max_items   Number of maximum items to fetch
1692          * @param string  $filter      Feed items filter (activity, posts or comments)
1693          * @param boolean $nocache     Wether to bypass caching
1694          * @return string XML feed or empty string on error
1695          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1696          * @throws \ImagickException
1697          */
1698         public static function feed(string $owner_nick, string &$last_update, int $max_items = 300, string $filter = 'activity', bool $nocache = false): string
1699         {
1700                 $stamp = microtime(true);
1701
1702                 $owner = User::getOwnerDataByNick($owner_nick);
1703                 if (!$owner) {
1704                         return '';
1705                 }
1706
1707                 $cachekey = 'ostatus:feed:' . $owner_nick . ':' . $filter . ':' . $last_update;
1708
1709                 $previous_created = $last_update;
1710
1711                 // Don't cache when the last item was posted less then 15 minutes ago (Cache duration)
1712                 if ((time() - strtotime($owner['last-item'])) < 15*60) {
1713                         $result = DI::cache()->get($cachekey);
1714                         if (!$nocache && !is_null($result)) {
1715                                 Logger::info('Feed duration: ' . number_format(microtime(true) - $stamp, 3) . ' - ' . $owner_nick . ' - ' . $filter . ' - ' . $previous_created . ' (cached)');
1716                                 $last_update = $result['last_update'];
1717                                 return $result['feed'];
1718                         }
1719                 }
1720
1721                 if (!strlen($last_update)) {
1722                         $last_update = 'now -30 days';
1723                 }
1724
1725                 $check_date = DateTimeFormat::utc($last_update);
1726                 $authorid = Contact::getIdForURL($owner['url']);
1727
1728                 $condition = [
1729                         "`uid` = ? AND `received` > ? AND NOT `deleted` AND `private` != ? AND `visible` AND `wall` AND `parent-network` IN (?, ?)",
1730                         $owner['uid'],
1731                         $check_date,
1732                         Item::PRIVATE,
1733                         Protocol::OSTATUS,
1734                         Protocol::DFRN,
1735                 ];
1736
1737                 if ($filter === 'comments') {
1738                         $condition[0] .= " AND `object-type` = ? ";
1739                         $condition[] = Activity\ObjectType::COMMENT;
1740                 }
1741
1742                 if ($owner['contact-type'] != Contact::TYPE_COMMUNITY) {
1743                         $condition[0] .= " AND `contact-id` = ? AND `author-id` = ?";
1744                         $condition[] = $owner['id'];
1745                         $condition[] = $authorid;
1746                 }
1747
1748                 $params = ['order' => ['received' => true], 'limit' => $max_items];
1749
1750                 if ($filter === 'posts') {
1751                         $ret = Post::selectThread([], $condition, $params);
1752                 } else {
1753                         $ret = Post::select([], $condition, $params);
1754                 }
1755
1756                 $items = Post::toArray($ret);
1757
1758                 $doc = new DOMDocument('1.0', 'utf-8');
1759                 $doc->formatOutput = true;
1760
1761                 $root = self::addHeader($doc, $owner, $filter);
1762
1763                 foreach ($items as $item) {
1764                         if (DI::config()->get('system', 'ostatus_debug')) {
1765                                 $item['body'] .= '🍼';
1766                         }
1767
1768                         if (in_array($item['verb'], [Activity::FOLLOW, Activity::O_UNFOLLOW, Activity::LIKE])) {
1769                                 continue;
1770                         }
1771
1772                         $entry = self::entry($doc, $item, $owner, false);
1773                         $root->appendChild($entry);
1774
1775                         if ($last_update < $item['created']) {
1776                                 $last_update = $item['created'];
1777                         }
1778                 }
1779
1780                 $feeddata = trim($doc->saveXML());
1781
1782                 $msg = ['feed' => $feeddata, 'last_update' => $last_update];
1783                 DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
1784
1785                 Logger::info('Feed duration: ' . number_format(microtime(true) - $stamp, 3) . ' - ' . $owner_nick . ' - ' . $filter . ' - ' . $previous_created);
1786
1787                 return $feeddata;
1788         }
1789
1790         /**
1791          * Creates the XML for a salmon message
1792          *
1793          * @param array $item  Data of the item that is to be posted
1794          * @param array $owner Contact data of the poster
1795          *
1796          * @return string XML for the salmon
1797          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1798          * @throws \ImagickException
1799          */
1800         public static function salmon(array $item, array $owner): string
1801         {
1802                 $doc = new DOMDocument('1.0', 'utf-8');
1803                 $doc->formatOutput = true;
1804
1805                 if (DI::config()->get('system', 'ostatus_debug')) {
1806                         $item['body'] .= '🐟';
1807                 }
1808
1809                 $entry = self::entry($doc, $item, $owner, true);
1810
1811                 $doc->appendChild($entry);
1812
1813                 return trim($doc->saveXML());
1814         }
1815
1816         /**
1817          * Checks if the given contact url does support OStatus
1818          *
1819          * @param string  $url    profile url
1820          * @return boolean
1821          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1822          * @throws \ImagickException
1823          */
1824         public static function isSupportedByContactUrl(string $url): bool
1825         {
1826                 $probe = Probe::uri($url, Protocol::OSTATUS);
1827                 return $probe['network'] == Protocol::OSTATUS;
1828         }
1829 }