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     const COLLECTION = 'http://activitystrea.ms/schema/1.0/collection';
  75     const APPLICATION = 'http://activitystrea.ms/schema/1.0/application';
  76
  77     // Atom elements we snarf
  78
  79     const TITLE   = 'title';
  80     const SUMMARY = 'summary';
  81     const ID      = 'id';
  82     const SOURCE  = 'source';
  83
  84     const NAME  = 'name';
  85     const URI   = 'uri';
  86     const EMAIL = 'email';
  87
  88     const POSTEROUS   = 'http://posterous.com/help/rss/1.0';
  89     const AUTHOR      = 'author';
  90     const USERIMAGE   = 'userImage';
  91     const PROFILEURL  = 'profileUrl';
  92     const NICKNAME    = 'nickName';
  93     const DISPLAYNAME = 'displayName';
  94
  95     public $element;
  96     public $type;
  97     public $id;
  98     public $title;
  99     public $summary;
 100     public $content;
 101     public $owner;
 102     public $link;
 103     public $source;
 104     public $avatarLinks = array();
 105     public $geopoint;
 106     public $poco;
 107     public $displayName;
 108
 109     // @todo move this stuff to it's own PHOTO activity object
 110     const MEDIA_DESCRIPTION = 'description';
 111
 112     public $thumbnail;
 113     public $largerImage;
 114     public $description;
 115     public $extra = array();
 116
 117     public $stream;
 118
 119     /**
 120      * Constructor
 121      *
 122      * This probably needs to be refactored
 123      * to generate a local class (ActivityPerson, ActivityFile, ...)
 124      * based on the object type.
 125      *
 126      * @param DOMElement $element DOM thing to turn into an Activity thing
 127      */
 128     function __construct($element = null)
 129     {
 130         if (empty($element)) {
 131             return;
 132         }
 133
 134         $this->element = $element;
 135
 136         $this->geopoint = $this->_childContent(
 137             $element,
 138             ActivityContext::POINT,
 139             ActivityContext::GEORSS
 140         );
 141
 142         if ($element->tagName == 'author') {
 143             $this->_fromAuthor($element);
 144         } else if ($element->tagName == 'item') {
 145             $this->_fromRssItem($element);
 146         } else {
 147             $this->_fromAtomEntry($element);
 148         }
 149
 150         // Some per-type attributes...
 151         if ($this->type == self::PERSON || $this->type == self::GROUP) {
 152             $this->displayName = $this->title;
 153
 154             $photos = ActivityUtils::getLinks($element, 'photo');
 155             if (count($photos)) {
 156                 foreach ($photos as $link) {
 157                     $this->avatarLinks[] = new AvatarLink($link);
 158                 }
 159             } else {
 160                 $avatars = ActivityUtils::getLinks($element, 'avatar');
 161                 foreach ($avatars as $link) {
 162                     $this->avatarLinks[] = new AvatarLink($link);
 163                 }
 164             }
 165
 166             $this->poco = new PoCo($element);
 167         }
 168
 169         if ($this->type == self::PHOTO) {
 170
 171             $this->thumbnail   = ActivityUtils::getLink($element, 'preview');
 172             $this->largerImage = ActivityUtils::getLink($element, 'enclosure');
 173
 174             $this->description = ActivityUtils::childContent(
 175                 $element,
 176                 ActivityObject::MEDIA_DESCRIPTION,
 177                 Activity::MEDIA
 178             );
 179         }
 180         if ($this->type == self::_LIST) {
 181             $owner = ActivityUtils::child($this->element, Activity::AUTHOR, Activity::SPEC);
 182             $this->owner = new ActivityObject($owner);
 183         }
 184     }
 185
 186     private function _fromAuthor($element)
 187     {
 188         $this->type = $this->_childContent($element,
 189                                            Activity::OBJECTTYPE,
 190                                            Activity::SPEC);
 191
 192         if (empty($this->type)) {
 193             $this->type = self::PERSON; // XXX: is this fair?
 194         }
 195
 196         // start with <atom:title>
 197
 198         $title = ActivityUtils::childHtmlContent($element, self::TITLE);
 199
 200         if (!empty($title)) {
 201             $this->title = html_entity_decode(strip_tags($title), ENT_QUOTES, 'UTF-8');
 202         }
 203
 204         // fall back to <atom:name>
 205
 206         if (empty($this->title)) {
 207             $this->title = $this->_childContent($element, self::NAME);
 208         }
 209
 210         // start with <atom:id>
 211
 212         $this->id = $this->_childContent($element, self::ID);
 213
 214         // fall back to <atom:uri>
 215
 216         if (empty($this->id)) {
 217             $this->id = $this->_childContent($element, self::URI);
 218         }
 219
 220         // fall further back to <atom:email>
 221
 222         if (empty($this->id)) {
 223             $email = $this->_childContent($element, self::EMAIL);
 224             if (!empty($email)) {
 225                 // XXX: acct: ?
 226                 $this->id = 'mailto:'.$email;
 227             }
 228         }
 229
 230         $this->link = ActivityUtils::getPermalink($element);
 231
 232         // fall finally back to <link rel=alternate>
 233
 234         if (empty($this->id) && !empty($this->link)) { // fallback if there's no ID
 235             $this->id = $this->link;
 236         }
 237     }
 238
 239     private function _fromAtomEntry($element)
 240     {
 241         $this->type = $this->_childContent($element, Activity::OBJECTTYPE,
 242                                            Activity::SPEC);
 243
 244         if (empty($this->type)) {
 245             $this->type = ActivityObject::NOTE;
 246         }
 247
 248         $this->summary = ActivityUtils::childHtmlContent($element, self::SUMMARY);
 249         $this->content = ActivityUtils::getContent($element);
 250
 251         // We don't like HTML in our titles, although it's technically allowed
 252
 253         $title = ActivityUtils::childHtmlContent($element, self::TITLE);
 254
 255         $this->title = html_entity_decode(strip_tags($title), ENT_QUOTES, 'UTF-8');
 256
 257         $this->source  = $this->_getSource($element);
 258
 259         $this->link = ActivityUtils::getPermalink($element);
 260
 261         $this->id = $this->_childContent($element, self::ID);
 262
 263         if (empty($this->id) && !empty($this->link)) { // fallback if there's no ID
 264             $this->id = $this->link;
 265         }
 266     }
 267
 268     // @todo FIXME: rationalize with Activity::_fromRssItem()
 269     private function _fromRssItem($item)
 270     {
 271         $this->title = ActivityUtils::childContent($item, ActivityObject::TITLE, Activity::RSS);
 272
 273         $contentEl = ActivityUtils::child($item, ActivityUtils::CONTENT, Activity::CONTENTNS);
 274
 275         if (!empty($contentEl)) {
 276             $this->content = htmlspecialchars_decode($contentEl->textContent, ENT_QUOTES);
 277         } else {
 278             $descriptionEl = ActivityUtils::child($item, Activity::DESCRIPTION, Activity::RSS);
 279             if (!empty($descriptionEl)) {
 280                 $this->content = htmlspecialchars_decode($descriptionEl->textContent, ENT_QUOTES);
 281             }
 282         }
 283
 284         $this->link = ActivityUtils::childContent($item, ActivityUtils::LINK, Activity::RSS);
 285
 286         $guidEl = ActivityUtils::child($item, Activity::GUID, Activity::RSS);
 287
 288         if (!empty($guidEl)) {
 289             $this->id = $guidEl->textContent;
 290
 291             if ($guidEl->hasAttribute('isPermaLink')) {
 292                 // overwrites <link>
 293                 $this->link = $this->id;
 294             }
 295         }
 296     }
 297
 298     public static function fromRssAuthor($el)
 299     {
 300         $text = $el->textContent;
 301
 302         if (preg_match('/^(.*?) \((.*)\)$/', $text, $match)) {
 303             $email = $match[1];
 304             $name = $match[2];
 305         } else if (preg_match('/^(.*?) <(.*)>$/', $text, $match)) {
 306             $name = $match[1];
 307             $email = $match[2];
 308         } else if (preg_match('/.*@.*/', $text)) {
 309             $email = $text;
 310             $name = null;
 311         } else {
 312             $name = $text;
 313             $email = null;
 314         }
 315
 316         // Not really enough info
 317
 318         $obj = new ActivityObject();
 319
 320         $obj->element = $el;
 321
 322         $obj->type  = ActivityObject::PERSON;
 323         $obj->title = $name;
 324
 325         if (!empty($email)) {
 326             $obj->id = 'mailto:'.$email;
 327         }
 328
 329         return $obj;
 330     }
 331
 332     public static function fromDcCreator($el)
 333     {
 334         // Not really enough info
 335
 336         $text = $el->textContent;
 337
 338         $obj = new ActivityObject();
 339
 340         $obj->element = $el;
 341
 342         $obj->title = $text;
 343         $obj->type  = ActivityObject::PERSON;
 344
 345         return $obj;
 346     }
 347
 348     public static function fromRssChannel($el)
 349     {
 350         $obj = new ActivityObject();
 351
 352         $obj->element = $el;
 353
 354         $obj->type = ActivityObject::PERSON; // @fixme guess better
 355
 356         $obj->title = ActivityUtils::childContent($el, ActivityObject::TITLE, Activity::RSS);
 357         $obj->link  = ActivityUtils::childContent($el, ActivityUtils::LINK, Activity::RSS);
 358         $obj->id    = ActivityUtils::getLink($el, Activity::SELF);
 359
 360         if (empty($obj->id)) {
 361             $obj->id = $obj->link;
 362         }
 363
 364         $desc = ActivityUtils::childContent($el, Activity::DESCRIPTION, Activity::RSS);
 365
 366         if (!empty($desc)) {
 367             $obj->content = htmlspecialchars_decode($desc, ENT_QUOTES);
 368         }
 369
 370         $imageEl = ActivityUtils::child($el, Activity::IMAGE, Activity::RSS);
 371
 372         if (!empty($imageEl)) {
 373             $url = ActivityUtils::childContent($imageEl, Activity::URL, Activity::RSS);
 374             $al = new AvatarLink();
 375             $al->url = $url;
 376             $obj->avatarLinks[] = $al;
 377         }
 378
 379         return $obj;
 380     }
 381
 382     public static function fromPosterousAuthor($el)
 383     {
 384         $obj = new ActivityObject();
 385
 386         $obj->type = ActivityObject::PERSON; // @fixme any others...?
 387
 388         $userImage = ActivityUtils::childContent($el, self::USERIMAGE, self::POSTEROUS);
 389
 390         if (!empty($userImage)) {
 391             $al = new AvatarLink();
 392             $al->url = $userImage;
 393             $obj->avatarLinks[] = $al;
 394         }
 395
 396         $obj->link = ActivityUtils::childContent($el, self::PROFILEURL, self::POSTEROUS);
 397         $obj->id   = $obj->link;
 398
 399         $obj->poco = new PoCo();
 400
 401         $obj->poco->preferredUsername = ActivityUtils::childContent($el, self::NICKNAME, self::POSTEROUS);
 402         $obj->poco->displayName       = ActivityUtils::childContent($el, self::DISPLAYNAME, self::POSTEROUS);
 403
 404         $obj->title = $obj->poco->displayName;
 405
 406         return $obj;
 407     }
 408
 409     private function _childContent($element, $tag, $namespace=ActivityUtils::ATOM)
 410     {
 411         return ActivityUtils::childContent($element, $tag, $namespace);
 412     }
 413
 414     // Try to get a unique id for the source feed
 415
 416     private function _getSource($element)
 417     {
 418         $sourceEl = ActivityUtils::child($element, 'source');
 419
 420         if (empty($sourceEl)) {
 421             return null;
 422         } else {
 423             $href = ActivityUtils::getLink($sourceEl, 'self');
 424             if (!empty($href)) {
 425                 return $href;
 426             } else {
 427                 return ActivityUtils::childContent($sourceEl, 'id');
 428             }
 429         }
 430     }
 431
 432     static function fromNotice(Notice $notice)
 433     {
 434         $object = new ActivityObject();
 435
 436         if (Event::handle('StartActivityObjectFromNotice', array($notice, &$object))) {
 437
 438             $object->type    = (empty($notice->object_type)) ? ActivityObject::NOTE : $notice->object_type;
 439
 440             $object->id      = $notice->uri;
 441             $object->content = $notice->rendered;
 442             $object->link    = $notice->bestUrl();
 443
 444             Event::handle('EndActivityObjectFromNotice', array($notice, &$object));
 445         }
 446
 447         return $object;
 448     }
 449
 450     static function fromProfile(Profile $profile)
 451     {
 452         $object = new ActivityObject();
 453
 454         if (Event::handle('StartActivityObjectFromProfile', array($profile, &$object))) {
 455             $object->type   = ActivityObject::PERSON;
 456             $object->id     = $profile->getUri();
 457             $object->title  = $profile->getBestName();
 458             $object->link   = $profile->profileurl;
 459
 460             $orig = $profile->getOriginalAvatar();
 461
 462             if (!empty($orig)) {
 463                 $object->avatarLinks[] = AvatarLink::fromAvatar($orig);
 464             }
 465
 466             $sizes = array(
 467                 AVATAR_PROFILE_SIZE,
 468                 AVATAR_STREAM_SIZE,
 469                 AVATAR_MINI_SIZE
 470             );
 471
 472             foreach ($sizes as $size) {
 473                 $alink  = null;
 474                 $avatar = $profile->getAvatar($size);
 475
 476                 if (!empty($avatar)) {
 477                     $alink = AvatarLink::fromAvatar($avatar);
 478                 } else {
 479                     $alink = new AvatarLink();
 480                     $alink->type   = 'image/png';
 481                     $alink->height = $size;
 482                     $alink->width  = $size;
 483                     $alink->url    = Avatar::defaultImage($size);
 484
 485                     if ($size == AVATAR_PROFILE_SIZE) {
 486                         // Hack for Twitter import: we don't have a 96x96 image,
 487                         // but we do have a 73x73 image. For now, fake it with that.
 488                         $avatar = $profile->getAvatar(73);
 489                         if ($avatar) {
 490                             $alink = AvatarLink::fromAvatar($avatar);
 491                             $alink->height= $size;
 492                             $alink->width = $size;
 493                         }
 494                     }
 495                 }
 496
 497                 $object->avatarLinks[] = $alink;
 498             }
 499
 500             if (isset($profile->lat) && isset($profile->lon)) {
 501                 $object->geopoint = (float)$profile->lat
 502                     . ' ' . (float)$profile->lon;
 503             }
 504
 505             $object->poco = PoCo::fromProfile($profile);
 506
 507             if ($profile->getUser()) {
 508                 $object->extra[] = array('followers', array('url' => common_local_url('subscribers', array('nickname' => $profile->nickname))));
 509             }
 510
 511             Event::handle('EndActivityObjectFromProfile', array($profile, &$object));
 512         }
 513
 514         return $object;
 515     }
 516
 517     static function fromGroup($group)
 518     {
 519         $object = new ActivityObject();
 520
 521         if (Event::handle('StartActivityObjectFromGroup', array($group, &$object))) {
 522
 523             $object->type   = ActivityObject::GROUP;
 524             $object->id     = $group->getUri();
 525             $object->title  = $group->getBestName();
 526             $object->link   = $group->getUri();
 527
 528             $object->avatarLinks[] = AvatarLink::fromFilename($group->homepage_logo,
 529                                                               AVATAR_PROFILE_SIZE);
 530
 531             $object->avatarLinks[] = AvatarLink::fromFilename($group->stream_logo,
 532                                                               AVATAR_STREAM_SIZE);
 533
 534             $object->avatarLinks[] = AvatarLink::fromFilename($group->mini_logo,
 535                                                               AVATAR_MINI_SIZE);
 536
 537             $object->poco = PoCo::fromGroup($group);
 538             Event::handle('EndActivityObjectFromGroup', array($group, &$object));
 539         }
 540
 541         return $object;
 542     }
 543
 544     static function fromPeopletag($ptag)
 545     {
 546         $object = new ActivityObject();
 547         if (Event::handle('StartActivityObjectFromPeopletag', array($ptag, &$object))) {
 548             $object->type    = ActivityObject::_LIST;
 549
 550             $object->id      = $ptag->getUri();
 551             $object->title   = $ptag->tag;
 552             $object->summary = $ptag->description;
 553             $object->link    = $ptag->homeUrl();
 554             $object->owner   = Profile::staticGet('id', $ptag->tagger);
 555             $object->poco    = PoCo::fromProfile($object->owner);
 556             Event::handle('EndActivityObjectFromPeopletag', array($ptag, &$object));
 557         }
 558         return $object;
 559     }
 560
 561     static function fromFile(File $file)
 562     {
 563         $object = new ActivityObject();
 564
 565         if (Event::handle('StartActivityObjectFromFile', array($file, &$object))) {
 566
 567             $object->type = self::mimeTypeToObjectType($file->mimetype);
 568             $object->id   = TagURI::mint(sprintf("file:%d", $file->id));
 569             $object->link = common_local_url('attachment', array('attachment' => $file->id));
 570
 571             if ($file->title) {
 572                 $object->title = $file->title;
 573             }
 574
 575             if ($file->date) {
 576                 $object->date = $file->date;
 577             }
 578
 579             $thumbnail = $file->getThumbnail();
 580
 581             if (!empty($thumbnail)) {
 582                 $object->thumbnail = $thumbnail;
 583             }
 584
 585             switch (ActivityObject::canonicalType($object->type)) {
 586             case 'image':
 587                 $object->largerImage = $file->url;
 588                 break;
 589             case 'video':
 590             case 'audio':
 591                 $object->stream = $file->url;
 592                 break;
 593             }
 594
 595             Event::handle('EndActivityObjectFromFile', array($file, &$object));
 596         }
 597
 598         return $object;
 599     }
 600
 601     static function fromNoticeSource(Notice_source $source)
 602     {
 603         $object = new ActivityObject();
 604         $wellKnown = array('web', 'xmpp', 'mail', 'omb', 'system', 'api', 'ostatus',
 605                            'activity', 'feed', 'mirror', 'twitter', 'facebook');
 606
 607         if (Event::handle('StartActivityObjectFromNoticeSource', array($source, &$object))) {
 608             $object->type = ActivityObject::APPLICATION;
 609
 610             if (in_array($source->code, $wellKnown)) {
 611                 // We use one ID for all well-known StatusNet sources
 612                 $object->id = "tag:status.net,2009:notice-source:".$source->code;
 613             } else if ($source->url) {
 614                 // They registered with an URL
 615                 $object->id = $source->url;
 616             } else {
 617                 // Locally-registered, no URL
 618                 $object->id = TagURI::mint("notice-source:".$source->code);
 619             }
 620
 621             if ($source->url) {
 622                 $object->link = $source->url;
 623             }
 624
 625             if ($source->name) {
 626                 $object->title = $source->name;
 627             } else {
 628                 $object->title = $source->code;
 629             }
 630
 631             if ($source->created) {
 632                 $object->date = $source->created;
 633             }
 634
 635             $object->extras[] = array('status_net', array('source_code' => $source->code));
 636
 637             Event::handle('EndActivityObjectFromNoticeSource', array($source, &$object));
 638         }
 639
 640         return $object;
 641     }
 642
 643     function outputTo($xo, $tag='activity:object')
 644     {
 645         if (!empty($tag)) {
 646             $xo->elementStart($tag);
 647         }
 648
 649         if (Event::handle('StartActivityObjectOutputAtom', array($this, $xo))) {
 650             $xo->element('activity:object-type', null, $this->type);
 651
 652             // <author> uses URI
 653
 654             if ($tag == 'author') {
 655                 $xo->element(self::URI, null, $this->id);
 656             } else {
 657                 $xo->element(self::ID, null, $this->id);
 658             }
 659
 660             if (!empty($this->title)) {
 661                 $name = common_xml_safe_str($this->title);
 662                 if ($tag == 'author') {
 663                     // XXX: Backward compatibility hack -- atom:name should contain
 664                     // full name here, instead of nickname, i.e.: $name. Change
 665                     // this in the next version.
 666                     $xo->element(self::NAME, null, $this->poco->preferredUsername);
 667                 } else {
 668                     $xo->element(self::TITLE, null, $name);
 669                 }
 670             }
 671
 672             if (!empty($this->summary)) {
 673                 $xo->element(
 674                     self::SUMMARY,
 675                     null,
 676                     common_xml_safe_str($this->summary)
 677                 );
 678             }
 679
 680             if (!empty($this->content)) {
 681                 // XXX: assuming HTML content here
 682                 $xo->element(
 683                     ActivityUtils::CONTENT,
 684                     array('type' => 'html'),
 685                     common_xml_safe_str($this->content)
 686                 );
 687             }
 688
 689             if (!empty($this->link)) {
 690                 $xo->element(
 691                     'link',
 692                     array(
 693                         'rel' => 'alternate',
 694                         'type' => 'text/html',
 695                         'href' => $this->link
 696                     ),
 697                     null
 698                 );
 699             }
 700
 701             if(!empty($this->owner)) {
 702                 $owner = $this->owner->asActivityNoun(self::AUTHOR);
 703                 $xo->raw($owner);
 704             }
 705
 706             if ($this->type == ActivityObject::PERSON
 707                 || $this->type == ActivityObject::GROUP) {
 708
 709                 foreach ($this->avatarLinks as $avatar) {
 710                     $xo->element(
 711                         'link', array(
 712                             'rel'  => 'avatar',
 713                             'type'         => $avatar->type,
 714                             'media:width'  => $avatar->width,
 715                             'media:height' => $avatar->height,
 716                             'href' => $avatar->url
 717                         ),
 718                         null
 719                     );
 720                 }
 721             }
 722
 723             if (!empty($this->geopoint)) {
 724                 $xo->element(
 725                     'georss:point',
 726                     null,
 727                     $this->geopoint
 728                 );
 729             }
 730
 731             if (!empty($this->poco)) {
 732                 $this->poco->outputTo($xo);
 733             }
 734
 735             // @fixme there's no way here to make a tree; elements can only contain plaintext
 736             // @fixme these may collide with JSON extensions
 737             foreach ($this->extra as $el) {
 738                 list($extraTag, $attrs, $content) = $el;
 739                 $xo->element($extraTag, $attrs, $content);
 740             }
 741
 742             Event::handle('EndActivityObjectOutputAtom', array($this, $xo));
 743         }
 744
 745         if (!empty($tag)) {
 746             $xo->elementEnd($tag);
 747         }
 748
 749         return;
 750     }
 751
 752     function asString($tag='activity:object')
 753     {
 754         $xs = new XMLStringer(true);
 755
 756         $this->outputTo($xs, $tag);
 757
 758         return $xs->getString();
 759     }
 760
 761     /*
 762      * Returns an array based on this Activity Object suitable for
 763      * encoding as JSON.
 764      *
 765      * @return array $object the activity object array
 766      */
 767
 768     function asArray()
 769     {
 770         $object = array();
 771
 772         if (Event::handle('StartActivityObjectOutputJson', array($this, &$object))) {
 773             // XXX: attachments are added by Activity
 774
 775             // author (Add object for author? Could be useful for repeats.)
 776
 777             // content (Add rendered version of the notice?)
 778
 779             // displayName
 780
 781             if ($this->title) {
 782                 $object['displayName'] = $this->title;
 783             }
 784
 785             // downstreamDuplicates
 786
 787             // id
 788
 789             if ($this->id) {
 790                 $object['id'] = $this->id;
 791             } else if ($this->link) {
 792                 $object['id'] = $this->link;
 793             }
 794
 795             if ($this->type == ActivityObject::PERSON
 796                 || $this->type == ActivityObject::GROUP) {
 797
 798                 // XXX: Not sure what the best avatar is to use for the
 799                 // author's "image". For now, I'm using the large size.
 800
 801                 $imgLink          = null;
 802                 $avatarMediaLinks = array();
 803
 804                 foreach ($this->avatarLinks as $a) {
 805
 806                     // Make a MediaLink for every other Avatar
 807                     $avatar = new ActivityStreamsMediaLink(
 808                         $a->url,
 809                         $a->width,
 810                         $a->height,
 811                         $a->type,
 812                         'avatar'
 813                     );
 814
 815                     // Find the big avatar to use as the "image"
 816                     if ($a->height == AVATAR_PROFILE_SIZE) {
 817                         $imgLink = $avatar;
 818                     }
 819
 820                     $avatarMediaLinks[] = $avatar->asArray();
 821                 }
 822
 823                 if (!array_key_exists('status_net', $object)) {
 824                     $object['status_net'] = array();
 825                 }
 826
 827                 $object['status_net']['avatarLinks'] = $avatarMediaLinks; // extension
 828
 829                 // image
 830                 if (!empty($imgLink)) {
 831                     $object['image']  = $imgLink->asArray();
 832                 }
 833             }
 834
 835             // objectType
 836             //
 837             // We can probably use the whole schema URL here but probably the
 838             // relative simple name is easier to parse
 839
 840             $object['objectType'] = ActivityObject::canonicalType($this->type);
 841
 842             // summary
 843             $object['summary'] = $this->summary;
 844
 845             // content
 846             $object['content'] = $this->content;
 847
 848             // published (probably don't need. Might be useful for repeats.)
 849
 850             // updated (probably don't need this)
 851
 852             // TODO: upstreamDuplicates
 853
 854             if ($this->link) {
 855                 $object['url'] = $this->link;
 856             }
 857
 858             /* Extensions */
 859             // @fixme these may collide with XML extensions
 860             // @fixme multiple tags of same name will overwrite each other
 861             // @fixme text content from XML extensions will be lost
 862
 863             foreach ($this->extra as $e) {
 864                 list($objectName, $props, $txt) = $e;
 865                 if (!empty($objectName)) {
 866                     $parts = explode(":", $objectName);
 867                     if (count($parts) == 2 && $parts[0] == "statusnet") {
 868                         if (!array_key_exists('status_net', $object)) {
 869                             $object['status_net'] = array();
 870                         }
 871                         $object['status_net'][$parts[1]] = $props;
 872                     } else {
 873                         $object[$objectName] = $props;
 874                     }
 875                 }
 876             }
 877
 878             if (!empty($this->geopoint)) {
 879
 880                 list($lat, $lon) = explode(' ', $this->geopoint);
 881
 882                 $object['location'] = array(
 883                     'objectType' => 'place',
 884                     'position' => sprintf("%+02.5F%+03.5F/", $lat, $lon),
 885                     'lat' => $lat,
 886                     'lon' => $lon
 887                 );
 888
 889                 $loc = Location::fromLatLon($lat, $lon);
 890
 891                 if ($loc) {
 892                     $name = $loc->getName();
 893
 894                     if ($name) {
 895                         $object['location']['displayName'] = $name;
 896                     }
 897                     $url = $loc->getURL();
 898
 899                     if ($url) {
 900                         $object['location']['url'] = $url;
 901                     }
 902                 }
 903             }
 904
 905             if (!empty($this->poco)) {
 906                 $object['portablecontacts_net'] = array_filter($this->poco->asArray());
 907             }
 908
 909             if (!empty($this->thumbnail)) {
 910                 if (is_string($this->thumbnail)) {
 911                     $object['image'] = array('url' => $this->thumbnail);
 912                 } else {
 913                     $object['image'] = array('url' => $this->thumbnail->url);
 914                     if ($this->thumbnail->width) {
 915                         $object['image']['width'] = $this->thumbnail->width;
 916                     }
 917                     if ($this->thumbnail->height) {
 918                         $object['image']['height'] = $this->thumbnail->height;
 919                     }
 920                 }
 921             }
 922
 923             switch (ActivityObject::canonicalType($this->type)) {
 924             case 'image':
 925                 if (!empty($this->largerImage)) {
 926                     $object['fullImage'] = array('url' => $this->largerImage);
 927                 }
 928                 break;
 929             case 'audio':
 930             case 'video':
 931                 if (!empty($this->stream)) {
 932                     $object['stream'] = array('url' => $this->stream);
 933                 }
 934                 break;
 935             }
 936
 937             Event::handle('EndActivityObjectOutputJson', array($this, &$object));
 938         }
 939         return array_filter($object);
 940     }
 941
 942     static function canonicalType($type) {
 943         $ns = 'http://activitystrea.ms/schema/1.0/';
 944         if (substr($type, 0, mb_strlen($ns)) == $ns) {
 945             return substr($type, mb_strlen($ns));
 946         } else {
 947             return $type;
 948         }
 949     }
 950
 951     static function mimeTypeToObjectType($mimeType) {
 952         $ot = null;
 953
 954         // Default
 955
 956         if (empty($mimeType)) {
 957             return self::FILE;
 958         }
 959
 960         $parts = explode('/', $mimeType);
 961
 962         switch ($parts[0]) {
 963         case 'image':
 964             $ot = self::IMAGE;
 965             break;
 966         case 'audio':
 967             $ot = self::AUDIO;
 968             break;
 969         case 'video':
 970             $ot = self::VIDEO;
 971             break;
 972         default:
 973             $ot = self::FILE;
 974         }
 975
 976         return $ot;
 977     }
 978 }