lib/activityobject.php

   1 <?php
   2 /**
   3  * StatusNet, the distributed open-source microblogging tool
   4  *
   5  * An activity
   6  *
   7  * PHP version 5
   8  *
   9  * LICENCE: This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU Affero General Public License as published by
  11  * the Free Software Foundation, either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU Affero General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Affero General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  *
  22  * @category  Feed
  23  * @package   StatusNet
  24  * @author    Evan Prodromou <evan@status.net>
  25  * @author    Zach Copley <zach@status.net>
  26  * @copyright 2010 StatusNet, Inc.
  27  * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
  28  * @link      http://status.net/
  29  */
  30
  31 if (!defined('GNUSOCIAL')) {
  32     exit(1);
  33 }
  34
  35 require_once(INSTALLDIR . '/lib/activitystreamjsondocument.php');
  36
  37 /**
  38  * A noun-ish thing in the activity universe
  39  *
  40  * The activity streams spec talks about activity objects, while also having
  41  * a tag activity:object, which is in fact an activity object. Aaaaaah!
  42  *
  43  * This is just a thing in the activity universe. Can be the subject, object,
  44  * or indirect object (target!) of an activity verb. Rotten name, and I'm
  45  * propagating it. *sigh*
  46  *
  47  * @category  OStatus
  48  * @package   StatusNet
  49  * @author    Evan Prodromou <evan@status.net>
  50  * @copyright 2010 StatusNet, Inc.
  51  * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
  52  * @link      http://status.net/
  53  */
  54 class ActivityObject
  55 {
  56     const ARTICLE     = 'http://activitystrea.ms/schema/1.0/article';
  57     const BLOGENTRY   = 'http://activitystrea.ms/schema/1.0/blog-entry';
  58     const NOTE        = 'http://activitystrea.ms/schema/1.0/note';
  59     const STATUS      = 'http://activitystrea.ms/schema/1.0/status';
  60     const FILE        = 'http://activitystrea.ms/schema/1.0/file';
  61     const PHOTO       = 'http://activitystrea.ms/schema/1.0/photo';
  62     const ALBUM       = 'http://activitystrea.ms/schema/1.0/photo-album';
  63     const PLAYLIST    = 'http://activitystrea.ms/schema/1.0/playlist';
  64     const VIDEO       = 'http://activitystrea.ms/schema/1.0/video';
  65     const AUDIO       = 'http://activitystrea.ms/schema/1.0/audio';
  66     const BOOKMARK    = 'http://activitystrea.ms/schema/1.0/bookmark';
  67     const PERSON      = 'http://activitystrea.ms/schema/1.0/person';
  68     const GROUP       = 'http://activitystrea.ms/schema/1.0/group';
  69     const _LIST       = 'http://activitystrea.ms/schema/1.0/list'; // LIST is reserved
  70     const PLACE       = 'http://activitystrea.ms/schema/1.0/place';
  71     const COMMENT     = 'http://activitystrea.ms/schema/1.0/comment';
  72     // ^^^^^^^^^^ tea!
  73     const ACTIVITY    = 'http://activitystrea.ms/schema/1.0/activity';
  74     const SERVICE     = 'http://activitystrea.ms/schema/1.0/service';
  75     const IMAGE       = 'http://activitystrea.ms/schema/1.0/image';
  76     const COLLECTION  = 'http://activitystrea.ms/schema/1.0/collection';
  77     const APPLICATION = 'http://activitystrea.ms/schema/1.0/application';
  78
  79     // Atom elements we snarf
  80
  81     const TITLE = 'title';
  82     const SUMMARY = 'summary';
  83     const ID = 'id';
  84     const SOURCE = 'source';
  85
  86     const NAME = 'name';
  87     const URI = 'uri';
  88     const EMAIL = 'email';
  89
  90     const POSTEROUS = 'http://posterous.com/help/rss/1.0';
  91     const AUTHOR = 'author';
  92     const USERIMAGE = 'userImage';
  93     const PROFILEURL = 'profileUrl';
  94     const NICKNAME = 'nickName';
  95     const DISPLAYNAME = 'displayName';
  96     const MEDIA_DESCRIPTION = 'description';
  97     public $element;
  98     public $type;
  99     public $id;
 100     public $title;
 101     public $summary;
 102     public $content;
 103     public $owner;
 104     public $link;   // think APP (Atom Publishing Protocol)
 105     public $selfLink;
 106     public $source;
 107     public $avatarLinks = [];
 108     public $geopoint;
 109     public $poco;
 110
 111     // @todo move this stuff to it's own PHOTO activity object
 112     public $displayName;
 113     public $thumbnail;
 114     public $largerImage;
 115     public $description;
 116     public $extra = [];
 117
 118     public $stream;
 119
 120     /**
 121      * Constructor
 122      *
 123      * This probably needs to be refactored
 124      * to generate a local class (ActivityPerson, ActivityFile, ...)
 125      * based on the object type.
 126      *
 127      * @param DOMElement $element DOM thing to turn into an Activity thing
 128      */
 129     public function __construct($element = null)
 130     {
 131         if (empty($element)) {
 132             return;
 133         }
 134
 135         $this->element = $element;
 136
 137         $this->geopoint = $this->_childContent(
 138             $element,
 139             ActivityContext::POINT,
 140             ActivityContext::GEORSS
 141         );
 142
 143         if ($element->tagName == 'author') {
 144             $this->_fromAuthor($element);
 145         } elseif ($element->tagName == 'item') {
 146             $this->_fromRssItem($element);
 147         } else {
 148             $this->_fromAtomEntry($element);
 149         }
 150
 151         // Some per-type attributes...
 152         if ($this->type == self::PERSON || $this->type == self::GROUP) {
 153             $this->displayName = $this->title;
 154
 155             $photos = ActivityUtils::getLinks($element, 'photo');
 156             if (count($photos)) {
 157                 foreach ($photos as $link) {
 158                     $this->avatarLinks[] = new AvatarLink($link);
 159                 }
 160             } else {
 161                 $avatars = ActivityUtils::getLinks($element, 'avatar');
 162                 foreach ($avatars as $link) {
 163                     $this->avatarLinks[] = new AvatarLink($link);
 164                 }
 165             }
 166
 167             $this->poco = new PoCo($element);
 168         }
 169
 170         if ($this->type == self::PHOTO) {
 171             $this->thumbnail = ActivityUtils::getLink($element, 'preview');
 172             $this->largerImage = ActivityUtils::getLink($element, 'enclosure');
 173
 174             $this->description = ActivityUtils::childContent(
 175                 $element,
 176                 ActivityObject::MEDIA_DESCRIPTION,
 177                 Activity::MEDIA
 178             );
 179         }
 180         if ($this->type == self::_LIST) {
 181             $owner = ActivityUtils::child($this->element, Activity::AUTHOR, Activity::SPEC);
 182             $this->owner = new ActivityObject($owner);
 183         }
 184     }
 185
 186     private function _childContent($element, $tag, $namespace = ActivityUtils::ATOM)
 187     {
 188         return ActivityUtils::childContent($element, $tag, $namespace);
 189     }
 190
 191     private function _fromAuthor($element)
 192     {
 193         $this->type = $this->_childContent(
 194             $element,
 195             Activity::OBJECTTYPE,
 196             Activity::SPEC
 197         );
 198
 199         if (empty($this->type)) {
 200             $this->type = self::PERSON; // XXX: is this fair?
 201         }
 202
 203
 204         // Start with <poco::displayName>
 205
 206         $this->title = ActivityUtils::childContent($element, PoCo::DISPLAYNAME, PoCo::NS);
 207
 208         // try falling back to <atom:title>
 209
 210         if (empty($this->title)) {
 211             $title = ActivityUtils::childHtmlContent($element, self::TITLE);
 212
 213             if (!empty($title)) {
 214                 $this->title = common_strip_html($title);
 215             }
 216         }
 217
 218         // fall back to <atom:name> as a last resort
 219
 220         if (empty($this->title)) {
 221             $this->title = $this->_childContent($element, self::NAME);
 222         }
 223
 224         // start with <atom:id>
 225
 226         $this->id = $this->_childContent($element, self::ID);
 227
 228         // fall back to <atom:uri>
 229
 230         if (empty($this->id)) {
 231             $this->id = $this->_childContent($element, self::URI);
 232         }
 233
 234         // fall further back to <atom:email>
 235
 236         if (empty($this->id)) {
 237             $email = $this->_childContent($element, self::EMAIL);
 238             if (!empty($email)) {
 239                 // XXX: acct: ?
 240                 $this->id = 'mailto:' . $email;
 241             }
 242         }
 243
 244         $this->link = ActivityUtils::getPermalink($element);
 245
 246         // fall finally back to <link rel=alternate>
 247
 248         if (empty($this->id) && !empty($this->link)) { // fallback if there's no ID
 249             $this->id = $this->link;
 250         }
 251     }
 252
 253     // @todo FIXME: rationalize with Activity::_fromRssItem()
 254
 255     private function _fromRssItem($item)
 256     {
 257         if (empty($this->type)) {
 258             $this->type = ActivityObject::NOTE;
 259         }
 260
 261         $this->title = ActivityUtils::childContent($item, ActivityObject::TITLE, Activity::RSS);
 262
 263         $contentEl = ActivityUtils::child($item, ActivityUtils::CONTENT, Activity::CONTENTNS);
 264
 265         if (!empty($contentEl)) {
 266             $this->content = htmlspecialchars_decode($contentEl->textContent, ENT_QUOTES);
 267         } else {
 268             $descriptionEl = ActivityUtils::child($item, Activity::DESCRIPTION, Activity::RSS);
 269             if (!empty($descriptionEl)) {
 270                 $this->content = htmlspecialchars_decode($descriptionEl->textContent, ENT_QUOTES);
 271             }
 272         }
 273
 274         $this->link = ActivityUtils::childContent($item, ActivityUtils::LINK, Activity::RSS);
 275
 276         $guidEl = ActivityUtils::child($item, Activity::GUID, Activity::RSS);
 277
 278         if (!empty($guidEl)) {
 279             $this->id = $guidEl->textContent;
 280
 281             if ($guidEl->hasAttribute('isPermaLink') && $guidEl->getAttribute('isPermaLink') != 'false') {
 282                 // overwrites <link>
 283                 $this->link = $this->id;
 284             }
 285         }
 286     }
 287
 288     private function _fromAtomEntry($element)
 289     {
 290         $this->type = $this->_childContent(
 291             $element,
 292             Activity::OBJECTTYPE,
 293             Activity::SPEC
 294         );
 295
 296         if (empty($this->type)) {
 297             $this->type = ActivityObject::NOTE;
 298         }
 299
 300         $this->summary = ActivityUtils::childHtmlContent($element, self::SUMMARY);
 301         $this->content = ActivityUtils::getContent($element);
 302
 303         // We don't like HTML in our titles, although it's technically allowed
 304         $this->title = common_strip_html(ActivityUtils::childHtmlContent($element, self::TITLE));
 305
 306         $this->source = $this->_getSource($element);
 307
 308         $this->link = ActivityUtils::getPermalink($element);
 309         $this->selfLink = ActivityUtils::getSelfLink($element);
 310
 311         $this->id = $this->_childContent($element, self::ID);
 312
 313         if (empty($this->id) && !empty($this->link)) { // fallback if there's no ID
 314             $this->id = $this->link;
 315         }
 316
 317         $els = $element->childNodes;
 318
 319         for ($i = 0; $i < $els->length; $i++) {
 320             $link = $els->item($i);
 321             if ($link->localName == ActivityUtils::LINK && $link->namespaceURI == ActivityUtils::ATOM) {
 322                 $attrs = [];
 323                 foreach ($link->attributes as $attrName => $attrNode) {
 324                     $attrs[$attrName] = $attrNode->nodeValue;
 325                 }
 326                 $this->extra[] = [$link->localName,
 327                     $attrs,
 328                     $link->nodeValue];
 329             }
 330         }
 331     }
 332
 333     private function _getSource($element)
 334     {
 335         $sourceEl = ActivityUtils::child($element, 'source');
 336
 337         if (empty($sourceEl)) {
 338             return null;
 339         } else {
 340             $href = ActivityUtils::getLink($sourceEl, 'self');
 341             if (!empty($href)) {
 342                 return $href;
 343             } else {
 344                 return ActivityUtils::childContent($sourceEl, 'id');
 345             }
 346         }
 347     }
 348
 349     public static function fromRssAuthor($el)
 350     {
 351         $text = $el->textContent;
 352
 353         if (preg_match('/^(.*?) \((.*)\)$/', $text, $match)) {
 354             $email = $match[1];
 355             $name = $match[2];
 356         } elseif (preg_match('/^(.*?) <(.*)>$/', $text, $match)) {
 357             $name = $match[1];
 358             $email = $match[2];
 359         } elseif (preg_match('/.*@.*/', $text)) {
 360             $email = $text;
 361             $name = null;
 362         } else {
 363             $name = $text;
 364             $email = null;
 365         }
 366
 367         // Not really enough info
 368
 369         $obj = new ActivityObject();
 370
 371         $obj->element = $el;
 372
 373         $obj->type = ActivityObject::PERSON;
 374         $obj->title = $name;
 375
 376         if (!empty($email)) {
 377             $obj->id = 'mailto:' . $email;
 378         }
 379
 380         return $obj;
 381     }
 382
 383     public static function fromDcCreator($el)
 384     {
 385         // Not really enough info
 386
 387         $text = $el->textContent;
 388
 389         $obj = new ActivityObject();
 390
 391         $obj->element = $el;
 392
 393         $obj->title = $text;
 394         $obj->type = ActivityObject::PERSON;
 395
 396         return $obj;
 397     }
 398
 399     public static function fromRssChannel($el)
 400     {
 401         $obj = new ActivityObject();
 402
 403         $obj->element = $el;
 404
 405         $obj->type = ActivityObject::PERSON; // @fixme guess better
 406
 407         $obj->title = ActivityUtils::childContent($el, ActivityObject::TITLE, Activity::RSS);
 408         $obj->link = ActivityUtils::childContent($el, ActivityUtils::LINK, Activity::RSS);
 409         $obj->id = ActivityUtils::getLink($el, Activity::SELF);
 410
 411         if (empty($obj->id)) {
 412             $obj->id = $obj->link;
 413         }
 414
 415         $desc = ActivityUtils::childContent($el, Activity::DESCRIPTION, Activity::RSS);
 416
 417         if (!empty($desc)) {
 418             $obj->content = htmlspecialchars_decode($desc, ENT_QUOTES);
 419         }
 420
 421         $imageEl = ActivityUtils::child($el, Activity::IMAGE, Activity::RSS);
 422
 423         if (!empty($imageEl)) {
 424             $url = ActivityUtils::childContent($imageEl, Activity::URL, Activity::RSS);
 425             $al = new AvatarLink();
 426             $al->url = $url;
 427             $obj->avatarLinks[] = $al;
 428         }
 429
 430         return $obj;
 431     }
 432
 433     // Try to get a unique id for the source feed
 434
 435     public static function fromPosterousAuthor($el)
 436     {
 437         $obj = new ActivityObject();
 438
 439         $obj->type = ActivityObject::PERSON; // @fixme any others...?
 440
 441         $userImage = ActivityUtils::childContent($el, self::USERIMAGE, self::POSTEROUS);
 442
 443         if (!empty($userImage)) {
 444             $al = new AvatarLink();
 445             $al->url = $userImage;
 446             $obj->avatarLinks[] = $al;
 447         }
 448
 449         $obj->link = ActivityUtils::childContent($el, self::PROFILEURL, self::POSTEROUS);
 450         $obj->id = $obj->link;
 451
 452         $obj->poco = new PoCo();
 453
 454         $obj->poco->preferredUsername = ActivityUtils::childContent($el, self::NICKNAME, self::POSTEROUS);
 455         $obj->poco->displayName = ActivityUtils::childContent($el, self::DISPLAYNAME, self::POSTEROUS);
 456
 457         $obj->title = $obj->poco->displayName;
 458
 459         return $obj;
 460     }
 461
 462     public static function fromGroup(User_group $group)
 463     {
 464         $object = new ActivityObject();
 465
 466         if (Event::handle('StartActivityObjectFromGroup', [$group, &$object])) {
 467             $object->type = ActivityObject::GROUP;
 468             $object->id = $group->getUri();
 469             $object->title = $group->getBestName();
 470             $object->link = $group->getUri();
 471
 472             $object->avatarLinks[] = AvatarLink::fromFilename(
 473                 $group->homepage_logo,
 474                 AVATAR_PROFILE_SIZE
 475             );
 476
 477             $object->avatarLinks[] = AvatarLink::fromFilename(
 478                 $group->stream_logo,
 479                 AVATAR_STREAM_SIZE
 480             );
 481
 482             $object->avatarLinks[] = AvatarLink::fromFilename(
 483                 $group->mini_logo,
 484                 AVATAR_MINI_SIZE
 485             );
 486
 487             $object->poco = PoCo::fromGroup($group);
 488             Event::handle('EndActivityObjectFromGroup', [$group, &$object]);
 489         }
 490
 491         return $object;
 492     }
 493
 494     public static function fromPeopletag($ptag)
 495     {
 496         $object = new ActivityObject();
 497         if (Event::handle('StartActivityObjectFromPeopletag', [$ptag, &$object])) {
 498             $object->type = ActivityObject::_LIST;
 499
 500             $object->id = $ptag->getUri();
 501             $object->title = $ptag->tag;
 502             $object->summary = $ptag->description;
 503             $object->link = $ptag->homeUrl();
 504             $object->owner = Profile::getKV('id', $ptag->tagger);
 505             $object->poco = PoCo::fromProfile($object->owner);
 506             Event::handle('EndActivityObjectFromPeopletag', [$ptag, &$object]);
 507         }
 508         return $object;
 509     }
 510
 511     public static function fromFile(File $file)
 512     {
 513         $object = new ActivityObject();
 514
 515         if (Event::handle('StartActivityObjectFromFile', [$file, &$object])) {
 516             $object->type = self::mimeTypeToObjectType($file->mimetype);
 517             $object->id = TagURI::mint(sprintf("file:%d", $file->id));
 518             $object->link = $file->getAttachmentUrl();
 519
 520             if ($file->title) {
 521                 $object->title = $file->title;
 522             }
 523
 524             if ($file->date) {
 525                 $object->date = $file->date;
 526             }
 527
 528             try {
 529                 $thumbnail = $file->getThumbnail();
 530                 $object->thumbnail = $thumbnail;
 531             } catch (UseFileAsThumbnailException $e) {
 532                 $object->thumbnail = null;
 533             } catch (UnsupportedMediaException $e) {
 534                 $object->thumbnail = null;
 535             }
 536
 537             switch (self::canonicalType($object->type)) {
 538                 case 'image':
 539                     $object->largerImage = $file->getUrl();
 540                     break;
 541                 case 'video':
 542                 case 'audio':
 543                     $object->stream = $file->getUrl();
 544                     break;
 545             }
 546
 547             Event::handle('EndActivityObjectFromFile', [$file, &$object]);
 548         }
 549
 550         return $object;
 551     }
 552
 553     public static function mimeTypeToObjectType($mimeType)
 554     {
 555         $ot = null;
 556
 557         // Default
 558
 559         if (empty($mimeType)) {
 560             return self::FILE;
 561         }
 562
 563         $parts = explode('/', $mimeType);
 564
 565         switch ($parts[0]) {
 566             case 'image':
 567                 $ot = self::IMAGE;
 568                 break;
 569             case 'audio':
 570                 $ot = self::AUDIO;
 571                 break;
 572             case 'video':
 573                 $ot = self::VIDEO;
 574                 break;
 575             default:
 576                 $ot = self::FILE;
 577         }
 578
 579         return $ot;
 580     }
 581
 582     public static function canonicalType($type)
 583     {
 584         return ActivityUtils::resolveUri($type, true);
 585     }
 586
 587     public static function fromNoticeSource(Notice_source $source)
 588     {
 589         $object = new ActivityObject();
 590         $wellKnown = ['web', 'xmpp', 'mail', 'omb', 'system', 'api', 'ostatus',
 591             'activity', 'feed', 'mirror', 'twitter', 'facebook'];
 592
 593         if (Event::handle('StartActivityObjectFromNoticeSource', [$source, &$object])) {
 594             $object->type = ActivityObject::APPLICATION;
 595
 596             if (in_array($source->code, $wellKnown)) {
 597                 // We use one ID for all well-known StatusNet sources
 598                 $object->id = "tag:status.net,2009:notice-source:" . $source->code;
 599             } elseif ($source->url) {
 600                 // They registered with an URL
 601                 $object->id = $source->url;
 602             } else {
 603                 // Locally-registered, no URL
 604                 $object->id = TagURI::mint("notice-source:" . $source->code);
 605             }
 606
 607             if ($source->url) {
 608                 $object->link = $source->url;
 609             }
 610
 611             if ($source->name) {
 612                 $object->title = $source->name;
 613             } else {
 614                 $object->title = $source->code;
 615             }
 616
 617             if ($source->created) {
 618                 $object->date = $source->created;
 619             }
 620
 621             $object->extra[] = ['status_net', ['source_code' => $source->code]];
 622
 623             Event::handle('EndActivityObjectFromNoticeSource', [$source, &$object]);
 624         }
 625
 626         return $object;
 627     }
 628
 629     public static function fromMessage(Message $message)
 630     {
 631         $object = new ActivityObject();
 632
 633         if (Event::handle('StartActivityObjectFromMessage', [$message, &$object])) {
 634             $object->type = ActivityObject::NOTE;
 635             $object->id = ($message->uri) ? $message->uri : (($message->url) ? $message->url : TagURI::mint(sprintf("message:%d", $message->id)));
 636             $object->content = $message->rendered;
 637             $object->date = $message->created;
 638
 639             if ($message->url) {
 640                 $object->link = $message->url;
 641             } else {
 642                 $object->link = common_local_url('showmessage', ['message' => $message->id]);
 643             }
 644
 645             $object->extra[] = ['status_net', ['message_id' => $message->id]];
 646
 647             Event::handle('EndActivityObjectFromMessage', [$message, &$object]);
 648         }
 649
 650         return $object;
 651     }
 652
 653     /*
 654      * Returns an array based on this Activity Object suitable for
 655      * encoding as JSON.
 656      *
 657      * @return array $object the activity object array
 658      */
 659
 660     public function asString($tag = 'activity:object')
 661     {
 662         $xs = new XMLStringer(true);
 663
 664         $this->outputTo($xs, $tag);
 665
 666         return $xs->getString();
 667     }
 668
 669     public function outputTo($xo, $tag = 'activity:object')
 670     {
 671         if (!empty($tag)) {
 672             $xo->elementStart($tag);
 673         }
 674
 675         if (Event::handle('StartActivityObjectOutputAtom', [$this, $xo])) {
 676             $xo->element('activity:object-type', null, $this->type);
 677
 678             // <author> uses URI
 679
 680             if ($tag == 'author') {
 681                 $xo->element(self::URI, null, $this->id);
 682             } else {
 683                 $xo->element(self::ID, null, $this->id);
 684             }
 685
 686             if (!empty($this->title)) {
 687                 $name = common_xml_safe_str($this->title);
 688                 if ($tag == 'author') {
 689                     // XXX: Backward compatibility hack -- atom:name should contain
 690                     // full name here, instead of nickname, i.e.: $name. Change
 691                     // this in the next version.
 692                     $xo->element(self::NAME, null, $this->poco->preferredUsername);
 693                 } else {
 694                     $xo->element(self::TITLE, null, $name);
 695                 }
 696             }
 697
 698             if (!empty($this->summary)) {
 699                 $xo->element(
 700                     self::SUMMARY,
 701                     null,
 702                     common_xml_safe_str($this->summary)
 703                 );
 704             }
 705
 706             if (!empty($this->content)) {
 707                 // XXX: assuming HTML content here
 708                 $xo->element(
 709                     ActivityUtils::CONTENT,
 710                     ['type' => 'html'],
 711                     common_xml_safe_str($this->content)
 712                 );
 713             }
 714
 715             if (!empty($this->link)) {
 716                 $xo->element(
 717                     'link',
 718                     [
 719                         'rel' => 'alternate',
 720                         'type' => 'text/html',
 721                         'href' => $this->link
 722                     ]
 723                 );
 724             }
 725
 726             if (!empty($this->selfLink)) {
 727                 $xo->element(
 728                     'link',
 729                     [
 730                         'rel' => 'self',
 731                         'type' => 'application/atom+xml',
 732                         'href' => $this->selfLink
 733                     ]
 734                 );
 735             }
 736
 737             if (!empty($this->owner)) {
 738                 $owner = $this->owner->asActivityNoun(self::AUTHOR);
 739                 $xo->raw($owner);
 740             }
 741
 742             if ($this->type == ActivityObject::PERSON
 743                 || $this->type == ActivityObject::GROUP) {
 744                 foreach ($this->avatarLinks as $alink) {
 745                     $xo->element(
 746                         'link',
 747                         [
 748                             'rel' => 'avatar',
 749                             'type' => $alink->type,
 750                             'media:width' => $alink->width,
 751                             'media:height' => $alink->height,
 752                             'href' => $alink->url,
 753                         ]
 754                     );
 755                 }
 756             }
 757
 758             if (!empty($this->geopoint)) {
 759                 $xo->element(
 760                     'georss:point',
 761                     null,
 762                     $this->geopoint
 763                 );
 764             }
 765
 766             if (!empty($this->poco)) {
 767                 $this->poco->outputTo($xo);
 768             }
 769
 770             // @fixme there's no way here to make a tree; elements can only contain plaintext
 771             // @fixme these may collide with JSON extensions
 772             foreach ($this->extra as $el) {
 773                 list($extraTag, $attrs, $content) = array_pad($el, 3, null);
 774                 $xo->element($extraTag, $attrs, $content);
 775             }
 776
 777             Event::handle('EndActivityObjectOutputAtom', [$this, $xo]);
 778         }
 779
 780         if (!empty($tag)) {
 781             $xo->elementEnd($tag);
 782         }
 783
 784         return;
 785     }
 786
 787     public function asArray()
 788     {
 789         $object = [];
 790
 791         if (Event::handle('StartActivityObjectOutputJson', [$this, &$object])) {
 792             // XXX: attachments are added by Activity
 793
 794             // author (Add object for author? Could be useful for repeats.)
 795
 796             // content (Add rendered version of the notice?)
 797
 798             // downstreamDuplicates
 799
 800             // id
 801
 802             if ($this->id) {
 803                 $object['id'] = $this->id;
 804             } elseif ($this->link) {
 805                 $object['id'] = $this->link;
 806             }
 807
 808             if ($this->type == ActivityObject::PERSON
 809                 || $this->type == ActivityObject::GROUP) {
 810
 811                 // displayName
 812                 $object['displayName'] = $this->title;
 813
 814                 // XXX: Not sure what the best avatar is to use for the
 815                 // author's "image". For now, I'm using the large size.
 816
 817                 $imgLink = null;
 818                 $avatarMediaLinks = [];
 819
 820                 foreach ($this->avatarLinks as $a) {
 821
 822                     // Make a MediaLink for every other Avatar
 823                     $avatar = new ActivityStreamsMediaLink(
 824                         $a->url,
 825                         $a->width,
 826                         $a->height,
 827                         $a->type,
 828                         'avatar'
 829                     );
 830
 831                     // Find the big avatar to use as the "image"
 832                     if ($a->height == AVATAR_PROFILE_SIZE) {
 833                         $imgLink = $avatar;
 834                     }
 835
 836                     $avatarMediaLinks[] = $avatar->asArray();
 837                 }
 838
 839                 if (!array_key_exists('status_net', $object)) {
 840                     $object['status_net'] = [];
 841                 }
 842
 843                 $object['status_net']['avatarLinks'] = $avatarMediaLinks; // extension
 844
 845                 // image
 846                 if (!empty($imgLink)) {
 847                     $object['image'] = $imgLink->asArray();
 848                 }
 849             }
 850
 851             // objectType
 852             //
 853             // We can probably use the whole schema URL here but probably the
 854             // relative simple name is easier to parse
 855
 856             $object['objectType'] = self::canonicalType($this->type);
 857
 858             // summary
 859             $object['summary'] = $this->summary;
 860
 861             // content, usually rendered HTML
 862             $object['content'] = $this->content;
 863
 864             // published (probably don't need. Might be useful for repeats.)
 865
 866             // updated (probably don't need this)
 867
 868             // TODO: upstreamDuplicates
 869
 870             if ($this->link) {
 871                 $object['url'] = $this->link;
 872             }
 873
 874             /* Extensions */
 875             // @fixme these may collide with XML extensions
 876             // @fixme multiple tags of same name will overwrite each other
 877             // @fixme text content from XML extensions will be lost
 878
 879             foreach ($this->extra as $e) {
 880                 list($objectName, $props, $txt) = array_pad($e, 3, null);
 881                 if (!empty($objectName)) {
 882                     $parts = explode(":", $objectName);
 883                     if (count($parts) == 2 && $parts[0] == "statusnet") {
 884                         if (!array_key_exists('status_net', $object)) {
 885                             $object['status_net'] = [];
 886                         }
 887                         $object['status_net'][$parts[1]] = $props;
 888                     } else {
 889                         $object[$objectName] = $props;
 890                     }
 891                 }
 892             }
 893
 894             if (!empty($this->geopoint)) {
 895                 list($lat, $lon) = explode(' ', $this->geopoint);
 896
 897                 if (!empty($lat) && !empty($lon)) {
 898                     $object['location'] = [
 899                         'objectType' => 'place',
 900                         'position' => sprintf("%+02.5F%+03.5F/", $lat, $lon),
 901                         'lat' => $lat,
 902                         'lon' => $lon
 903                     ];
 904
 905                     $loc = Location::fromLatLon((float)$lat, (float)$lon);
 906
 907                     if ($loc) {
 908                         $name = $loc->getName();
 909
 910                         if ($name) {
 911                             $object['location']['displayName'] = $name;
 912                         }
 913                         $url = $loc->getURL();
 914
 915                         if ($url) {
 916                             $object['location']['url'] = $url;
 917                         }
 918                     }
 919                 }
 920             }
 921
 922             if (!empty($this->poco)) {
 923                 $object['portablecontacts_net'] = array_filter($this->poco->asArray());
 924             }
 925
 926             if (!empty($this->thumbnail)) {
 927                 if (is_string($this->thumbnail)) {
 928                     $object['image'] = ['url' => $this->thumbnail];
 929                 } else {
 930                     $object['image'] = ['url' => $this->thumbnail->getUrl()];
 931                     if ($this->thumbnail->width) {
 932                         $object['image']['width'] = $this->thumbnail->width;
 933                     }
 934                     if ($this->thumbnail->height) {
 935                         $object['image']['height'] = $this->thumbnail->height;
 936                     }
 937                 }
 938             }
 939
 940             switch (self::canonicalType($this->type)) {
 941                 case 'image':
 942                     if (!empty($this->largerImage)) {
 943                         $object['fullImage'] = ['url' => $this->largerImage];
 944                     }
 945                     break;
 946                 case 'audio':
 947                 case 'video':
 948                     if (!empty($this->stream)) {
 949                         $object['stream'] = ['url' => $this->stream];
 950                     }
 951                     break;
 952             }
 953
 954             Event::handle('EndActivityObjectOutputJson', [$this, &$object]);
 955         }
 956         return array_filter($object);
 957     }
 958
 959     public function getIdentifiers()
 960     {
 961         $ids = [];
 962         foreach (['id', 'link', 'url'] as $id) {
 963             if (isset($this->$id)) {
 964                 $ids[] = $this->$id;
 965             }
 966         }
 967         return array_unique($ids);
 968     }
 969 }