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