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 PLACE     = 'http://activitystrea.ms/schema/1.0/place';
  68     const COMMENT   = 'http://activitystrea.ms/schema/1.0/comment';
  69     // ^^^^^^^^^^ tea!
  70
  71     // Atom elements we snarf
  72
  73     const TITLE   = 'title';
  74     const SUMMARY = 'summary';
  75     const ID      = 'id';
  76     const SOURCE  = 'source';
  77
  78     const NAME  = 'name';
  79     const URI   = 'uri';
  80     const EMAIL = 'email';
  81
  82     const POSTEROUS   = 'http://posterous.com/help/rss/1.0';
  83     const AUTHOR      = 'author';
  84     const USERIMAGE   = 'userImage';
  85     const PROFILEURL  = 'profileUrl';
  86     const NICKNAME    = 'nickName';
  87     const DISPLAYNAME = 'displayName';
  88
  89     public $element;
  90     public $type;
  91     public $id;
  92     public $title;
  93     public $summary;
  94     public $content;
  95     public $link;
  96     public $source;
  97     public $avatarLinks = array();
  98     public $geopoint;
  99     public $poco;
 100     public $displayName;
 101
 102     // @todo move this stuff to it's own PHOTO activity object
 103     const MEDIA_DESCRIPTION = 'description';
 104
 105     public $thumbnail;
 106     public $largerImage;
 107     public $description;
 108
 109     /**
 110      * Constructor
 111      *
 112      * This probably needs to be refactored
 113      * to generate a local class (ActivityPerson, ActivityFile, ...)
 114      * based on the object type.
 115      *
 116      * @param DOMElement $element DOM thing to turn into an Activity thing
 117      */
 118     function __construct($element = null)
 119     {
 120         if (empty($element)) {
 121             return;
 122         }
 123
 124         $this->element = $element;
 125
 126         $this->geopoint = $this->_childContent(
 127             $element,
 128             ActivityContext::POINT,
 129             ActivityContext::GEORSS
 130         );
 131
 132         if ($element->tagName == 'author') {
 133             $this->_fromAuthor($element);
 134         } else if ($element->tagName == 'item') {
 135             $this->_fromRssItem($element);
 136         } else {
 137             $this->_fromAtomEntry($element);
 138         }
 139
 140         // Some per-type attributes...
 141         if ($this->type == self::PERSON || $this->type == self::GROUP) {
 142             $this->displayName = $this->title;
 143
 144             $photos = ActivityUtils::getLinks($element, 'photo');
 145             if (count($photos)) {
 146                 foreach ($photos as $link) {
 147                     $this->avatarLinks[] = new AvatarLink($link);
 148                 }
 149             } else {
 150                 $avatars = ActivityUtils::getLinks($element, 'avatar');
 151                 foreach ($avatars as $link) {
 152                     $this->avatarLinks[] = new AvatarLink($link);
 153                 }
 154             }
 155
 156             $this->poco = new PoCo($element);
 157         }
 158
 159         if ($this->type == self::PHOTO) {
 160
 161             $this->thumbnail   = ActivityUtils::getLink($element, 'preview');
 162             $this->largerImage = ActivityUtils::getLink($element, 'enclosure');
 163
 164             $this->description = ActivityUtils::childContent(
 165                 $element,
 166                 ActivityObject::MEDIA_DESCRIPTION,
 167                 Activity::MEDIA
 168             );
 169         }
 170     }
 171
 172     private function _fromAuthor($element)
 173     {
 174         $this->type  = self::PERSON; // XXX: is this fair?
 175         $this->title = $this->_childContent($element, self::NAME);
 176
 177         $this->id = $this->_childContent($element, self::URI);
 178
 179         if (empty($this->id)) {
 180             $email = $this->_childContent($element, self::EMAIL);
 181             if (!empty($email)) {
 182                 // XXX: acct: ?
 183                 $this->id = 'mailto:'.$email;
 184             }
 185         }
 186     }
 187
 188     private function _fromAtomEntry($element)
 189     {
 190         $this->type = $this->_childContent($element, Activity::OBJECTTYPE,
 191                                            Activity::SPEC);
 192
 193         if (empty($this->type)) {
 194             $this->type = ActivityObject::NOTE;
 195         }
 196
 197         $this->summary = ActivityUtils::childHtmlContent($element, self::SUMMARY);
 198         $this->content = ActivityUtils::getContent($element);
 199
 200         // We don't like HTML in our titles, although it's technically allowed
 201
 202         $title = ActivityUtils::childHtmlContent($element, self::TITLE);
 203
 204         $this->title = html_entity_decode(strip_tags($title), ENT_QUOTES, 'UTF-8');
 205
 206         $this->source  = $this->_getSource($element);
 207
 208         $this->link = ActivityUtils::getPermalink($element);
 209
 210         $this->id = $this->_childContent($element, self::ID);
 211
 212         if (empty($this->id) && !empty($this->link)) { // fallback if there's no ID
 213             $this->id = $this->link;
 214         }
 215     }
 216
 217     // @todo FIXME: rationalize with Activity::_fromRssItem()
 218     private function _fromRssItem($item)
 219     {
 220         $this->title = ActivityUtils::childContent($item, ActivityObject::TITLE, Activity::RSS);
 221
 222         $contentEl = ActivityUtils::child($item, ActivityUtils::CONTENT, Activity::CONTENTNS);
 223
 224         if (!empty($contentEl)) {
 225             $this->content = htmlspecialchars_decode($contentEl->textContent, ENT_QUOTES);
 226         } else {
 227             $descriptionEl = ActivityUtils::child($item, Activity::DESCRIPTION, Activity::RSS);
 228             if (!empty($descriptionEl)) {
 229                 $this->content = htmlspecialchars_decode($descriptionEl->textContent, ENT_QUOTES);
 230             }
 231         }
 232
 233         $this->link = ActivityUtils::childContent($item, ActivityUtils::LINK, Activity::RSS);
 234
 235         $guidEl = ActivityUtils::child($item, Activity::GUID, Activity::RSS);
 236
 237         if (!empty($guidEl)) {
 238             $this->id = $guidEl->textContent;
 239
 240             if ($guidEl->hasAttribute('isPermaLink')) {
 241                 // overwrites <link>
 242                 $this->link = $this->id;
 243             }
 244         }
 245     }
 246
 247     public static function fromRssAuthor($el)
 248     {
 249         $text = $el->textContent;
 250
 251         if (preg_match('/^(.*?) \((.*)\)$/', $text, $match)) {
 252             $email = $match[1];
 253             $name = $match[2];
 254         } else if (preg_match('/^(.*?) <(.*)>$/', $text, $match)) {
 255             $name = $match[1];
 256             $email = $match[2];
 257         } else if (preg_match('/.*@.*/', $text)) {
 258             $email = $text;
 259             $name = null;
 260         } else {
 261             $name = $text;
 262             $email = null;
 263         }
 264
 265         // Not really enough info
 266
 267         $obj = new ActivityObject();
 268
 269         $obj->element = $el;
 270
 271         $obj->type  = ActivityObject::PERSON;
 272         $obj->title = $name;
 273
 274         if (!empty($email)) {
 275             $obj->id = 'mailto:'.$email;
 276         }
 277
 278         return $obj;
 279     }
 280
 281     public static function fromDcCreator($el)
 282     {
 283         // Not really enough info
 284
 285         $text = $el->textContent;
 286
 287         $obj = new ActivityObject();
 288
 289         $obj->element = $el;
 290
 291         $obj->title = $text;
 292         $obj->type  = ActivityObject::PERSON;
 293
 294         return $obj;
 295     }
 296
 297     public static function fromRssChannel($el)
 298     {
 299         $obj = new ActivityObject();
 300
 301         $obj->element = $el;
 302
 303         $obj->type = ActivityObject::PERSON; // @fixme guess better
 304
 305         $obj->title = ActivityUtils::childContent($el, ActivityObject::TITLE, Activity::RSS);
 306         $obj->link  = ActivityUtils::childContent($el, ActivityUtils::LINK, Activity::RSS);
 307         $obj->id    = ActivityUtils::getLink($el, Activity::SELF);
 308
 309         if (empty($obj->id)) {
 310             $obj->id = $obj->link;
 311         }
 312
 313         $desc = ActivityUtils::childContent($el, Activity::DESCRIPTION, Activity::RSS);
 314
 315         if (!empty($desc)) {
 316             $obj->content = htmlspecialchars_decode($desc, ENT_QUOTES);
 317         }
 318
 319         $imageEl = ActivityUtils::child($el, Activity::IMAGE, Activity::RSS);
 320
 321         if (!empty($imageEl)) {
 322             $url = ActivityUtils::childContent($imageEl, Activity::URL, Activity::RSS);
 323             $al = new AvatarLink();
 324             $al->url = $url;
 325             $obj->avatarLinks[] = $al;
 326         }
 327
 328         return $obj;
 329     }
 330
 331     public static function fromPosterousAuthor($el)
 332     {
 333         $obj = new ActivityObject();
 334
 335         $obj->type = ActivityObject::PERSON; // @fixme any others...?
 336
 337         $userImage = ActivityUtils::childContent($el, self::USERIMAGE, self::POSTEROUS);
 338
 339         if (!empty($userImage)) {
 340             $al = new AvatarLink();
 341             $al->url = $userImage;
 342             $obj->avatarLinks[] = $al;
 343         }
 344
 345         $obj->link = ActivityUtils::childContent($el, self::PROFILEURL, self::POSTEROUS);
 346         $obj->id   = $obj->link;
 347
 348         $obj->poco = new PoCo();
 349
 350         $obj->poco->preferredUsername = ActivityUtils::childContent($el, self::NICKNAME, self::POSTEROUS);
 351         $obj->poco->displayName       = ActivityUtils::childContent($el, self::DISPLAYNAME, self::POSTEROUS);
 352
 353         $obj->title = $obj->poco->displayName;
 354
 355         return $obj;
 356     }
 357
 358     private function _childContent($element, $tag, $namespace=ActivityUtils::ATOM)
 359     {
 360         return ActivityUtils::childContent($element, $tag, $namespace);
 361     }
 362
 363     // Try to get a unique id for the source feed
 364
 365     private function _getSource($element)
 366     {
 367         $sourceEl = ActivityUtils::child($element, 'source');
 368
 369         if (empty($sourceEl)) {
 370             return null;
 371         } else {
 372             $href = ActivityUtils::getLink($sourceEl, 'self');
 373             if (!empty($href)) {
 374                 return $href;
 375             } else {
 376                 return ActivityUtils::childContent($sourceEl, 'id');
 377             }
 378         }
 379     }
 380
 381     static function fromNotice(Notice $notice)
 382     {
 383         $object = new ActivityObject();
 384
 385         $object->type    = ActivityObject::NOTE;
 386
 387         $object->id      = $notice->uri;
 388         $object->title   = $notice->content;
 389         $object->content = $notice->rendered;
 390         $object->link    = $notice->bestUrl();
 391
 392         return $object;
 393     }
 394
 395     static function fromProfile(Profile $profile)
 396     {
 397         $object = new ActivityObject();
 398
 399         $object->type   = ActivityObject::PERSON;
 400         $object->id     = $profile->getUri();
 401         $object->title  = $profile->getBestName();
 402         $object->link   = $profile->profileurl;
 403
 404         $orig = $profile->getOriginalAvatar();
 405
 406         if (!empty($orig)) {
 407             $object->avatarLinks[] = AvatarLink::fromAvatar($orig);
 408         }
 409
 410         $sizes = array(
 411             AVATAR_PROFILE_SIZE,
 412             AVATAR_STREAM_SIZE,
 413             AVATAR_MINI_SIZE
 414         );
 415
 416         foreach ($sizes as $size) {
 417             $alink  = null;
 418             $avatar = $profile->getAvatar($size);
 419
 420             if (!empty($avatar)) {
 421                 $alink = AvatarLink::fromAvatar($avatar);
 422             } else {
 423                 $alink = new AvatarLink();
 424                 $alink->type   = 'image/png';
 425                 $alink->height = $size;
 426                 $alink->width  = $size;
 427                 $alink->url    = Avatar::defaultImage($size);
 428
 429                 if ($size == AVATAR_PROFILE_SIZE) {
 430                     // Hack for Twitter import: we don't have a 96x96 image,
 431                     // but we do have a 73x73 image. For now, fake it with that.
 432                     $avatar = $profile->getAvatar(73);
 433                     if ($avatar) {
 434                         $alink = AvatarLink::fromAvatar($avatar);
 435                         $alink->height= $size;
 436                         $alink->width = $size;
 437                     }
 438                 }
 439             }
 440
 441             $object->avatarLinks[] = $alink;
 442         }
 443
 444         if (isset($profile->lat) && isset($profile->lon)) {
 445             $object->geopoint = (float)$profile->lat
 446                 . ' ' . (float)$profile->lon;
 447         }
 448
 449         $object->poco = PoCo::fromProfile($profile);
 450
 451         return $object;
 452     }
 453
 454     static function fromGroup($group)
 455     {
 456         $object = new ActivityObject();
 457
 458         $object->type   = ActivityObject::GROUP;
 459         $object->id     = $group->getUri();
 460         $object->title  = $group->getBestName();
 461         $object->link   = $group->getUri();
 462
 463         $object->avatarLinks[] = AvatarLink::fromFilename(
 464             $group->homepage_logo,
 465             AVATAR_PROFILE_SIZE
 466         );
 467
 468         $object->avatarLinks[] = AvatarLink::fromFilename(
 469             $group->stream_logo,
 470             AVATAR_STREAM_SIZE
 471         );
 472
 473         $object->avatarLinks[] = AvatarLink::fromFilename(
 474             $group->mini_logo,
 475             AVATAR_MINI_SIZE
 476         );
 477
 478         $object->poco = PoCo::fromGroup($group);
 479
 480         return $object;
 481     }
 482
 483     function asString($tag='activity:object')
 484     {
 485         $xs = new XMLStringer(true);
 486
 487         $xs->elementStart($tag);
 488
 489         $xs->element('activity:object-type', null, $this->type);
 490
 491         $xs->element(self::ID, null, $this->id);
 492
 493         if (!empty($this->title)) {
 494             $xs->element(
 495                 self::TITLE,
 496                 null,
 497                 common_xml_safe_str($this->title)
 498             );
 499         }
 500
 501         if (!empty($this->summary)) {
 502             $xs->element(
 503                 self::SUMMARY,
 504                 null,
 505                 common_xml_safe_str($this->summary)
 506             );
 507         }
 508
 509         if (!empty($this->content)) {
 510             // XXX: assuming HTML content here
 511             $xs->element(
 512                 ActivityUtils::CONTENT,
 513                 array('type' => 'html'),
 514                 common_xml_safe_str($this->content)
 515             );
 516         }
 517
 518         if (!empty($this->link)) {
 519             $xs->element(
 520                 'link',
 521                 array(
 522                     'rel' => 'alternate',
 523                     'type' => 'text/html',
 524                     'href' => $this->link
 525                 ),
 526                 null
 527             );
 528         }
 529
 530         if ($this->type == ActivityObject::PERSON
 531             || $this->type == ActivityObject::GROUP) {
 532
 533             foreach ($this->avatarLinks as $avatar) {
 534                 $xs->element(
 535                     'link', array(
 536                         'rel'  => 'avatar',
 537                         'type'         => $avatar->type,
 538                         'media:width'  => $avatar->width,
 539                         'media:height' => $avatar->height,
 540                         'href' => $avatar->url
 541                     ),
 542                     null
 543                 );
 544             }
 545         }
 546
 547         if (!empty($this->geopoint)) {
 548             $xs->element(
 549                 'georss:point',
 550                 null,
 551                 $this->geopoint
 552             );
 553         }
 554
 555         if (!empty($this->poco)) {
 556             $xs->raw($this->poco->asString());
 557         }
 558
 559         $xs->elementEnd($tag);
 560
 561         return $xs->getString();
 562     }
 563 }