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