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 /**
  36  * A noun-ish thing in the activity universe
  37  *
  38  * The activity streams spec talks about activity objects, while also having
  39  * a tag activity:object, which is in fact an activity object. Aaaaaah!
  40  *
  41  * This is just a thing in the activity universe. Can be the subject, object,
  42  * or indirect object (target!) of an activity verb. Rotten name, and I'm
  43  * propagating it. *sigh*
  44  *
  45  * @category  OStatus
  46  * @package   StatusNet
  47  * @author    Evan Prodromou <evan@status.net>
  48  * @copyright 2010 StatusNet, Inc.
  49  * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
  50  * @link      http://status.net/
  51  */
  52 class ActivityObject
  53 {
  54     const ARTICLE   = 'http://activitystrea.ms/schema/1.0/article';
  55     const BLOGENTRY = 'http://activitystrea.ms/schema/1.0/blog-entry';
  56     const NOTE      = 'http://activitystrea.ms/schema/1.0/note';
  57     const STATUS    = 'http://activitystrea.ms/schema/1.0/status';
  58     const FILE      = 'http://activitystrea.ms/schema/1.0/file';
  59     const PHOTO     = 'http://activitystrea.ms/schema/1.0/photo';
  60     const ALBUM     = 'http://activitystrea.ms/schema/1.0/photo-album';
  61     const PLAYLIST  = 'http://activitystrea.ms/schema/1.0/playlist';
  62     const VIDEO     = 'http://activitystrea.ms/schema/1.0/video';
  63     const AUDIO     = 'http://activitystrea.ms/schema/1.0/audio';
  64     const BOOKMARK  = 'http://activitystrea.ms/schema/1.0/bookmark';
  65     const PERSON    = 'http://activitystrea.ms/schema/1.0/person';
  66     const GROUP     = 'http://activitystrea.ms/schema/1.0/group';
  67     const _LIST     = 'http://activitystrea.ms/schema/1.0/list'; // LIST is reserved
  68     const PLACE     = 'http://activitystrea.ms/schema/1.0/place';
  69     const COMMENT   = 'http://activitystrea.ms/schema/1.0/comment';
  70     // ^^^^^^^^^^ tea!
  71     const ACTIVITY = 'http://activitystrea.ms/schema/1.0/activity';
  72     const SERVICE   = 'http://activitystrea.ms/schema/1.0/service';
  73     const IMAGE     = 'http://activitystrea.ms/schema/1.0/image';
  74
  75     // Atom elements we snarf
  76
  77     const TITLE   = 'title';
  78     const SUMMARY = 'summary';
  79     const ID      = 'id';
  80     const SOURCE  = 'source';
  81
  82     const NAME  = 'name';
  83     const URI   = 'uri';
  84     const EMAIL = 'email';
  85
  86     const POSTEROUS   = 'http://posterous.com/help/rss/1.0';
  87     const AUTHOR      = 'author';
  88     const USERIMAGE   = 'userImage';
  89     const PROFILEURL  = 'profileUrl';
  90     const NICKNAME    = 'nickName';
  91     const DISPLAYNAME = 'displayName';
  92
  93     public $element;
  94     public $type;
  95     public $id;
  96     public $title;
  97     public $summary;
  98     public $content;
  99     public $owner;
 100     public $link;
 101     public $source;
 102     public $avatarLinks = array();
 103     public $geopoint;
 104     public $poco;
 105     public $displayName;
 106
 107     // @todo move this stuff to it's own PHOTO activity object
 108     const MEDIA_DESCRIPTION = 'description';
 109
 110     public $thumbnail;
 111     public $largerImage;
 112     public $description;
 113     public $extra = array();
 114
 115     public $stream;
 116
 117     /**
 118      * Constructor
 119      *
 120      * This probably needs to be refactored
 121      * to generate a local class (ActivityPerson, ActivityFile, ...)
 122      * based on the object type.
 123      *
 124      * @param DOMElement $element DOM thing to turn into an Activity thing
 125      */
 126     function __construct($element = null)
 127     {
 128         if (empty($element)) {
 129             return;
 130         }
 131
 132         $this->element = $element;
 133
 134         $this->geopoint = $this->_childContent(
 135             $element,
 136             ActivityContext::POINT,
 137             ActivityContext::GEORSS
 138         );
 139
 140         if ($element->tagName == 'author') {
 141             $this->_fromAuthor($element);
 142         } else if ($element->tagName == 'item') {
 143             $this->_fromRssItem($element);
 144         } else {
 145             $this->_fromAtomEntry($element);
 146         }
 147
 148         // Some per-type attributes...
 149         if ($this->type == self::PERSON || $this->type == self::GROUP) {
 150             $this->displayName = $this->title;
 151
 152             $photos = ActivityUtils::getLinks($element, 'photo');
 153             if (count($photos)) {
 154                 foreach ($photos as $link) {
 155                     $this->avatarLinks[] = new AvatarLink($link);
 156                 }
 157             } else {
 158                 $avatars = ActivityUtils::getLinks($element, 'avatar');
 159                 foreach ($avatars as $link) {
 160                     $this->avatarLinks[] = new AvatarLink($link);
 161                 }
 162             }
 163
 164             $this->poco = new PoCo($element);
 165         }
 166
 167         if ($this->type == self::PHOTO) {
 168
 169             $this->thumbnail   = ActivityUtils::getLink($element, 'preview');
 170             $this->largerImage = ActivityUtils::getLink($element, 'enclosure');
 171
 172             $this->description = ActivityUtils::childContent(
 173                 $element,
 174                 ActivityObject::MEDIA_DESCRIPTION,
 175                 Activity::MEDIA
 176             );
 177         }
 178         if ($this->type == self::_LIST) {
 179             $owner = ActivityUtils::child($this->element, Activity::AUTHOR, Activity::SPEC);
 180             $this->owner = new ActivityObject($owner);
 181         }
 182     }
 183
 184     private function _fromAuthor($element)
 185     {
 186         $this->type = $this->_childContent($element,
 187                                            Activity::OBJECTTYPE,
 188                                            Activity::SPEC);
 189
 190         if (empty($this->type)) {
 191             $this->type = self::PERSON; // XXX: is this fair?
 192         }
 193
 194         // start with <atom:title>
 195
 196         $title = ActivityUtils::childHtmlContent($element, self::TITLE);
 197
 198         if (!empty($title)) {
 199             $this->title = html_entity_decode(strip_tags($title), ENT_QUOTES, 'UTF-8');
 200         }
 201
 202         // fall back to <atom:name>
 203
 204         if (empty($this->title)) {
 205             $this->title = $this->_childContent($element, self::NAME);
 206         }
 207
 208         // start with <atom:id>
 209
 210         $this->id = $this->_childContent($element, self::ID);
 211
 212         // fall back to <atom:uri>
 213
 214         if (empty($this->id)) {
 215             $this->id = $this->_childContent($element, self::URI);
 216         }
 217
 218         // fall further back to <atom:email>
 219
 220         if (empty($this->id)) {
 221             $email = $this->_childContent($element, self::EMAIL);
 222             if (!empty($email)) {
 223                 // XXX: acct: ?
 224                 $this->id = 'mailto:'.$email;
 225             }
 226         }
 227
 228         $this->link = ActivityUtils::getPermalink($element);
 229
 230         // fall finally back to <link rel=alternate>
 231
 232         if (empty($this->id) && !empty($this->link)) { // fallback if there's no ID
 233             $this->id = $this->link;
 234         }
 235     }
 236
 237     private function _fromAtomEntry($element)
 238     {
 239         $this->type = $this->_childContent($element, Activity::OBJECTTYPE,
 240                                            Activity::SPEC);
 241
 242         if (empty($this->type)) {
 243             $this->type = ActivityObject::NOTE;
 244         }
 245
 246         $this->summary = ActivityUtils::childHtmlContent($element, self::SUMMARY);
 247         $this->content = ActivityUtils::getContent($element);
 248
 249         // We don't like HTML in our titles, although it's technically allowed
 250
 251         $title = ActivityUtils::childHtmlContent($element, self::TITLE);
 252
 253         $this->title = html_entity_decode(strip_tags($title), ENT_QUOTES, 'UTF-8');
 254
 255         $this->source  = $this->_getSource($element);
 256
 257         $this->link = ActivityUtils::getPermalink($element);
 258
 259         $this->id = $this->_childContent($element, self::ID);
 260
 261         if (empty($this->id) && !empty($this->link)) { // fallback if there's no ID
 262             $this->id = $this->link;
 263         }
 264     }
 265
 266     // @todo FIXME: rationalize with Activity::_fromRssItem()
 267     private function _fromRssItem($item)
 268     {
 269         $this->title = ActivityUtils::childContent($item, ActivityObject::TITLE, Activity::RSS);
 270
 271         $contentEl = ActivityUtils::child($item, ActivityUtils::CONTENT, Activity::CONTENTNS);
 272
 273         if (!empty($contentEl)) {
 274             $this->content = htmlspecialchars_decode($contentEl->textContent, ENT_QUOTES);
 275         } else {
 276             $descriptionEl = ActivityUtils::child($item, Activity::DESCRIPTION, Activity::RSS);
 277             if (!empty($descriptionEl)) {
 278                 $this->content = htmlspecialchars_decode($descriptionEl->textContent, ENT_QUOTES);
 279             }
 280         }
 281
 282         $this->link = ActivityUtils::childContent($item, ActivityUtils::LINK, Activity::RSS);
 283
 284         $guidEl = ActivityUtils::child($item, Activity::GUID, Activity::RSS);
 285
 286         if (!empty($guidEl)) {
 287             $this->id = $guidEl->textContent;
 288
 289             if ($guidEl->hasAttribute('isPermaLink')) {
 290                 // overwrites <link>
 291                 $this->link = $this->id;
 292             }
 293         }
 294     }
 295
 296     public static function fromRssAuthor($el)
 297     {
 298         $text = $el->textContent;
 299
 300         if (preg_match('/^(.*?) \((.*)\)$/', $text, $match)) {
 301             $email = $match[1];
 302             $name = $match[2];
 303         } else if (preg_match('/^(.*?) <(.*)>$/', $text, $match)) {
 304             $name = $match[1];
 305             $email = $match[2];
 306         } else if (preg_match('/.*@.*/', $text)) {
 307             $email = $text;
 308             $name = null;
 309         } else {
 310             $name = $text;
 311             $email = null;
 312         }
 313
 314         // Not really enough info
 315
 316         $obj = new ActivityObject();
 317
 318         $obj->element = $el;
 319
 320         $obj->type  = ActivityObject::PERSON;
 321         $obj->title = $name;
 322
 323         if (!empty($email)) {
 324             $obj->id = 'mailto:'.$email;
 325         }
 326
 327         return $obj;
 328     }
 329
 330     public static function fromDcCreator($el)
 331     {
 332         // Not really enough info
 333
 334         $text = $el->textContent;
 335
 336         $obj = new ActivityObject();
 337
 338         $obj->element = $el;
 339
 340         $obj->title = $text;
 341         $obj->type  = ActivityObject::PERSON;
 342
 343         return $obj;
 344     }
 345
 346     public static function fromRssChannel($el)
 347     {
 348         $obj = new ActivityObject();
 349
 350         $obj->element = $el;
 351
 352         $obj->type = ActivityObject::PERSON; // @fixme guess better
 353
 354         $obj->title = ActivityUtils::childContent($el, ActivityObject::TITLE, Activity::RSS);
 355         $obj->link  = ActivityUtils::childContent($el, ActivityUtils::LINK, Activity::RSS);
 356         $obj->id    = ActivityUtils::getLink($el, Activity::SELF);
 357
 358         if (empty($obj->id)) {
 359             $obj->id = $obj->link;
 360         }
 361
 362         $desc = ActivityUtils::childContent($el, Activity::DESCRIPTION, Activity::RSS);
 363
 364         if (!empty($desc)) {
 365             $obj->content = htmlspecialchars_decode($desc, ENT_QUOTES);
 366         }
 367
 368         $imageEl = ActivityUtils::child($el, Activity::IMAGE, Activity::RSS);
 369
 370         if (!empty($imageEl)) {
 371             $url = ActivityUtils::childContent($imageEl, Activity::URL, Activity::RSS);
 372             $al = new AvatarLink();
 373             $al->url = $url;
 374             $obj->avatarLinks[] = $al;
 375         }
 376
 377         return $obj;
 378     }
 379
 380     public static function fromPosterousAuthor($el)
 381     {
 382         $obj = new ActivityObject();
 383
 384         $obj->type = ActivityObject::PERSON; // @fixme any others...?
 385
 386         $userImage = ActivityUtils::childContent($el, self::USERIMAGE, self::POSTEROUS);
 387
 388         if (!empty($userImage)) {
 389             $al = new AvatarLink();
 390             $al->url = $userImage;
 391             $obj->avatarLinks[] = $al;
 392         }
 393
 394         $obj->link = ActivityUtils::childContent($el, self::PROFILEURL, self::POSTEROUS);
 395         $obj->id   = $obj->link;
 396
 397         $obj->poco = new PoCo();
 398
 399         $obj->poco->preferredUsername = ActivityUtils::childContent($el, self::NICKNAME, self::POSTEROUS);
 400         $obj->poco->displayName       = ActivityUtils::childContent($el, self::DISPLAYNAME, self::POSTEROUS);
 401
 402         $obj->title = $obj->poco->displayName;
 403
 404         return $obj;
 405     }
 406
 407     private function _childContent($element, $tag, $namespace=ActivityUtils::ATOM)
 408     {
 409         return ActivityUtils::childContent($element, $tag, $namespace);
 410     }
 411
 412     // Try to get a unique id for the source feed
 413
 414     private function _getSource($element)
 415     {
 416         $sourceEl = ActivityUtils::child($element, 'source');
 417
 418         if (empty($sourceEl)) {
 419             return null;
 420         } else {
 421             $href = ActivityUtils::getLink($sourceEl, 'self');
 422             if (!empty($href)) {
 423                 return $href;
 424             } else {
 425                 return ActivityUtils::childContent($sourceEl, 'id');
 426             }
 427         }
 428     }
 429
 430     static function fromNotice(Notice $notice)
 431     {
 432         $object = new ActivityObject();
 433
 434         if (Event::handle('StartActivityObjectFromNotice', array($notice, &$object))) {
 435
 436             $object->type    = (empty($notice->object_type)) ? ActivityObject::NOTE : $notice->object_type;
 437
 438             $object->id      = $notice->uri;
 439             $object->content = $notice->rendered;
 440             $object->link    = $notice->bestUrl();
 441
 442             Event::handle('EndActivityObjectFromNotice', array($notice, &$object));
 443         }
 444
 445         return $object;
 446     }
 447
 448     static function fromProfile(Profile $profile)
 449     {
 450         $object = new ActivityObject();
 451
 452         if (Event::handle('StartActivityObjectFromProfile', array($profile, &$object))) {
 453             $object->type   = ActivityObject::PERSON;
 454             $object->id     = $profile->getUri();
 455             $object->title  = $profile->getBestName();
 456             $object->link   = $profile->profileurl;
 457
 458             $orig = $profile->getOriginalAvatar();
 459
 460             if (!empty($orig)) {
 461                 $object->avatarLinks[] = AvatarLink::fromAvatar($orig);
 462             }
 463
 464             $sizes = array(
 465                 AVATAR_PROFILE_SIZE,
 466                 AVATAR_STREAM_SIZE,
 467                 AVATAR_MINI_SIZE
 468             );
 469
 470             foreach ($sizes as $size) {
 471                 $alink  = null;
 472                 $avatar = $profile->getAvatar($size);
 473
 474                 if (!empty($avatar)) {
 475                     $alink = AvatarLink::fromAvatar($avatar);
 476                 } else {
 477                     $alink = new AvatarLink();
 478                     $alink->type   = 'image/png';
 479                     $alink->height = $size;
 480                     $alink->width  = $size;
 481                     $alink->url    = Avatar::defaultImage($size);
 482
 483                     if ($size == AVATAR_PROFILE_SIZE) {
 484                         // Hack for Twitter import: we don't have a 96x96 image,
 485                         // but we do have a 73x73 image. For now, fake it with that.
 486                         $avatar = $profile->getAvatar(73);
 487                         if ($avatar) {
 488                             $alink = AvatarLink::fromAvatar($avatar);
 489                             $alink->height= $size;
 490                             $alink->width = $size;
 491                         }
 492                     }
 493                 }
 494
 495                 $object->avatarLinks[] = $alink;
 496             }
 497
 498             if (isset($profile->lat) && isset($profile->lon)) {
 499                 $object->geopoint = (float)$profile->lat
 500                     . ' ' . (float)$profile->lon;
 501             }
 502
 503             $object->poco = PoCo::fromProfile($profile);
 504
 505             Event::handle('EndActivityObjectFromProfile', array($profile, &$object));
 506         }
 507
 508         return $object;
 509     }
 510
 511     static function fromGroup($group)
 512     {
 513         $object = new ActivityObject();
 514
 515         if (Event::handle('StartActivityObjectFromGroup', array($group, &$object))) {
 516
 517             $object->type   = ActivityObject::GROUP;
 518             $object->id     = $group->getUri();
 519             $object->title  = $group->getBestName();
 520             $object->link   = $group->getUri();
 521
 522             $object->avatarLinks[] = AvatarLink::fromFilename($group->homepage_logo,
 523                                                               AVATAR_PROFILE_SIZE);
 524
 525             $object->avatarLinks[] = AvatarLink::fromFilename($group->stream_logo,
 526                                                               AVATAR_STREAM_SIZE);
 527
 528             $object->avatarLinks[] = AvatarLink::fromFilename($group->mini_logo,
 529                                                               AVATAR_MINI_SIZE);
 530
 531             $object->poco = PoCo::fromGroup($group);
 532             Event::handle('EndActivityObjectFromGroup', array($group, &$object));
 533         }
 534
 535         return $object;
 536     }
 537
 538     static function fromPeopletag($ptag)
 539     {
 540         $object = new ActivityObject();
 541         if (Event::handle('StartActivityObjectFromPeopletag', array($ptag, &$object))) {
 542             $object->type    = ActivityObject::_LIST;
 543
 544             $object->id      = $ptag->getUri();
 545             $object->title   = $ptag->tag;
 546             $object->summary = $ptag->description;
 547             $object->link    = $ptag->homeUrl();
 548             $object->owner   = Profile::staticGet('id', $ptag->tagger);
 549             $object->poco    = PoCo::fromProfile($object->owner);
 550             Event::handle('EndActivityObjectFromPeopletag', array($ptag, &$object));
 551         }
 552         return $object;
 553     }
 554
 555     static function fromFile(File $file)
 556     {
 557         $object = new ActivityObject();
 558
 559         if (Event::handle('StartActivityObjectFromFile', array($file, &$object))) {
 560
 561             $object->type = self::mimeTypeToObjectType($file->mimetype);
 562             $object->id   = TagURI::mint(sprintf("file:%d", $file->id));
 563             $object->link = common_local_url('attachment', array('id' => $file->id));
 564
 565             if ($file->title) {
 566                 $object->title = $file->title;
 567             }
 568
 569             if ($file->date) {
 570                 $object->date = $file->date;
 571             }
 572
 573             $thumbnail = $file->getThumbnail();
 574
 575             if (!empty($thumbnail)) {
 576                 $object->thumbnail = $thumbnail;
 577             }
 578
 579             switch ($object->type) {
 580             case ActivityObject::IMAGE:
 581                 $object->largerImage = $file->url;
 582                 break;
 583             case ActivityObject::VIDEO:
 584             case ActivityObject::AUDIO:
 585                 $object->stream = $file->url;
 586                 break;
 587             }
 588
 589             Event::handle('EndActivityObjectFromFile', array($file, &$object));
 590         }
 591
 592         return $object;
 593     }
 594
 595     function outputTo($xo, $tag='activity:object')
 596     {
 597         if (!empty($tag)) {
 598             $xo->elementStart($tag);
 599         }
 600
 601         if (Event::handle('StartActivityObjectOutputAtom', array($this, $xo))) {
 602             $xo->element('activity:object-type', null, $this->type);
 603
 604             // <author> uses URI
 605
 606             if ($tag == 'author') {
 607                 $xo->element(self::URI, null, $this->id);
 608             } else {
 609                 $xo->element(self::ID, null, $this->id);
 610             }
 611
 612             if (!empty($this->title)) {
 613                 $name = common_xml_safe_str($this->title);
 614                 if ($tag == 'author') {
 615                     // XXX: Backward compatibility hack -- atom:name should contain
 616                     // full name here, instead of nickname, i.e.: $name. Change
 617                     // this in the next version.
 618                     $xo->element(self::NAME, null, $this->poco->preferredUsername);
 619                 } else {
 620                     $xo->element(self::TITLE, null, $name);
 621                 }
 622             }
 623
 624             if (!empty($this->summary)) {
 625                 $xo->element(
 626                     self::SUMMARY,
 627                     null,
 628                     common_xml_safe_str($this->summary)
 629                 );
 630             }
 631
 632             if (!empty($this->content)) {
 633                 // XXX: assuming HTML content here
 634                 $xo->element(
 635                     ActivityUtils::CONTENT,
 636                     array('type' => 'html'),
 637                     common_xml_safe_str($this->content)
 638                 );
 639             }
 640
 641             if (!empty($this->link)) {
 642                 $xo->element(
 643                     'link',
 644                     array(
 645                         'rel' => 'alternate',
 646                         'type' => 'text/html',
 647                         'href' => $this->link
 648                     ),
 649                     null
 650                 );
 651             }
 652
 653             if(!empty($this->owner)) {
 654                 $owner = $this->owner->asActivityNoun(self::AUTHOR);
 655                 $xo->raw($owner);
 656             }
 657
 658             if ($this->type == ActivityObject::PERSON
 659                 || $this->type == ActivityObject::GROUP) {
 660
 661                 foreach ($this->avatarLinks as $avatar) {
 662                     $xo->element(
 663                         'link', array(
 664                             'rel'  => 'avatar',
 665                             'type'         => $avatar->type,
 666                             'media:width'  => $avatar->width,
 667                             'media:height' => $avatar->height,
 668                             'href' => $avatar->url
 669                         ),
 670                         null
 671                     );
 672                 }
 673             }
 674
 675             if (!empty($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) = $el;
 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, &$object))) {
 725             // XXX: attachments are added by Activity
 726
 727             // author (Add object for author? Could be useful for repeats.)
 728
 729             // content (Add rendered version of the notice?)
 730
 731             // displayName
 732
 733             if ($this->title) {
 734                 $object['displayName'] = $this->title;
 735             }
 736
 737             // downstreamDuplicates
 738
 739             // id
 740             $object['id'] = $this->id;
 741
 742             if ($this->type == ActivityObject::PERSON
 743                 || $this->type == ActivityObject::GROUP) {
 744
 745                 // XXX: Not sure what the best avatar is to use for the
 746                 // author's "image". For now, I'm using the large size.
 747
 748                 $imgLink          = null;
 749                 $avatarMediaLinks = array();
 750
 751                 foreach ($this->avatarLinks as $a) {
 752
 753                     // Make a MediaLink for every other Avatar
 754                     $avatar = new ActivityStreamsMediaLink(
 755                         $a->url,
 756                         $a->width,
 757                         $a->height,
 758                         $a->type,
 759                         'avatar'
 760                     );
 761
 762                     // Find the big avatar to use as the "image"
 763                     if ($a->height == AVATAR_PROFILE_SIZE) {
 764                         $imgLink = $avatar;
 765                     }
 766
 767                     $avatarMediaLinks[] = $avatar->asArray();
 768                 }
 769
 770                 if (!array_key_exists('status_net', $object)) {
 771                     $object['status_net'] = array();
 772                 }
 773
 774                 $object['status_net']['avatarLinks'] = $avatarMediaLinks; // extension
 775
 776                 // image
 777                 if (!empty($imgLink)) {
 778                     $object['image']  = $imgLink->asArray();
 779                 }
 780             }
 781
 782             // objectType
 783             //
 784             // We can probably use the whole schema URL here but probably the
 785             // relative simple name is easier to parse
 786
 787             $object['objectType'] = ActivityObject::canonicalType($this->type);
 788
 789             // summary
 790             $object['summary'] = $this->summary;
 791
 792             // summary
 793             $object['content'] = $this->content;
 794
 795             // published (probably don't need. Might be useful for repeats.)
 796
 797             // updated (probably don't need this)
 798
 799             // TODO: upstreamDuplicates
 800
 801             // url (XXX: need to put the right thing here...)
 802             $object['url'] = $this->id;
 803
 804             /* Extensions */
 805             // @fixme these may collide with XML extensions
 806             // @fixme multiple tags of same name will overwrite each other
 807             // @fixme text content from XML extensions will be lost
 808
 809             foreach ($this->extra as $e) {
 810                 list($objectName, $props, $txt) = $e;
 811                 if (!empty($objectName)) {
 812                     $parts = explode(":", $objectName);
 813                     if (count($parts) == 2 && $parts[0] == "statusnet") {
 814                         if (!array_key_exists('status_net', $object)) {
 815                             $object['status_net'] = array();
 816                         }
 817                         $object['status_net'][$parts[1]] = $props;
 818                     } else {
 819                         $object[$objectName] = $props;
 820                     }
 821                 }
 822             }
 823
 824             if (!empty($this->geopoint)) {
 825
 826                 list($lat, $lon) = explode(' ', $this->geopoint);
 827
 828                 $object['location'] = array(
 829                     'objectType' => 'place',
 830                     'position' => sprintf("%+02.5F%+03.5F/", $lat, $lon),
 831                     'lat' => $lat,
 832                     'lon' => $lon
 833                 );
 834
 835                 $loc = Location::fromLatLon($lat, $lon);
 836
 837                 if ($loc) {
 838                     $name = $loc->getName();
 839
 840                     if ($name) {
 841                         $object['location']['displayName'] = $name;
 842                     }
 843                     $url = $loc->getURL();
 844
 845                     if ($url) {
 846                         $object['location']['url'] = $url;
 847                     }
 848                 }
 849             }
 850
 851             if (!empty($this->poco)) {
 852                 $object['portablecontacts_net'] = array_filter($this->poco->asArray());
 853             }
 854
 855             if (!empty($this->thumbnail)) {
 856                 if (is_string($this->thumbnail)) {
 857                     $object['image'] = array('url' => $this->thumbnail);
 858                 } else {
 859                     $object['image'] = array('url' => $this->thumbnail->url);
 860                     if ($this->thumbnail->width) {
 861                         $object['image']['width'] = $this->thumbnail->width;
 862                     }
 863                     if ($this->thumbnail->height) {
 864                         $object['image']['height'] = $this->thumbnail->height;
 865                     }
 866                 }
 867             }
 868
 869             switch ($object->type) {
 870             case self::IMAGE:
 871                 if (!empty($this->largerImage)) {
 872                     $object['fullImage'] = array('url' => $this->largerImage);
 873                 }
 874                 break;
 875             case self::AUDIO:
 876             case self::VIDEO:
 877                 if (!empty($this->stream)) {
 878                     $object['stream'] = array('url' => $this->stream);
 879                 }
 880                 break;
 881             }
 882
 883             Event::handle('EndActivityObjectOutputJson', array($this, &$object));
 884         }
 885         return array_filter($object);
 886     }
 887
 888     static function canonicalType($type) {
 889         $ns = 'http://activitystrea.ms/schema/1.0/';
 890         if (substr($type, 0, mb_strlen($ns)) == $ns) {
 891             return substr($type, mb_strlen($ns));
 892         } else {
 893             return $type;
 894         }
 895     }
 896
 897     static function mimeTypeToObjectType($mimeType) {
 898         $ot = null;
 899
 900         // Default
 901
 902         if (empty($mimeType)) {
 903             return self::FILE;
 904         }
 905
 906         $parts = explode('/', $mimeType);
 907
 908         switch ($parts[0]) {
 909         case 'image':
 910             $ot = self::IMAGE;
 911             break;
 912         case 'audio':
 913             $ot = self::AUDIO;
 914             break;
 915         case 'video':
 916             $ot = self::VIDEO;
 917             break;
 918         default:
 919             $ot = self::FILE;
 920         }
 921
 922         return $ot;
 923     }
 924 }