Move ActivityObject and related stuff to core

1 files changed, 0 insertions, 863 deletions

diff --git a/plugins/OStatus/lib/activity.php b/plugins/OStatus/lib/activity.php
deleted file mode 100644
index 585028318..000000000
--- a/plugins/OStatus/lib/activity.php
+++ /dev/null
@@ -1,863 +0,0 @@
-<?php
-/**
- * StatusNet, the distributed open-source microblogging tool
- *
- * An activity
- *
- * PHP version 5
- *
- * LICENCE: This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- * @category  OStatus
- * @package   StatusNet
- * @author    Evan Prodromou <evan@status.net>
- * @copyright 2010 StatusNet, Inc.
- * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
- * @link      http://status.net/
- */
-
-if (!defined('STATUSNET')) {
-    exit(1);
-}
-
-class PoCoURL
-{
-    const TYPE      = 'type';
-    const VALUE     = 'value';
-    const PRIMARY   = 'primary';
-
-    public $type;
-    public $value;
-    public $primary;
-
-    function __construct($type, $value, $primary = false)
-    {
-        $this->type    = $type;
-        $this->value   = $value;
-        $this->primary = $primary;
-    }
-
-    function asString()
-    {
-        $xs = new XMLStringer(true);
-        $xs->elementStart('poco:urls');
-        $xs->element('poco:type', null, $this->type);
-        $xs->element('poco:value', null, $this->value);
-        if ($this->primary) {
-            $xs->element('poco:primary', null, 'true');
-        }
-        $xs->elementEnd('poco:urls');
-        return $xs->getString();
-    }
-}
-
-class PoCoAddress
-{
-    const ADDRESS   = 'address';
-    const FORMATTED = 'formatted';
-
-    public $formatted;
-
-    function __construct($formatted)
-    {
-        if (empty($formatted)) {
-            return null;
-        }
-        $this->formatted = $formatted;
-    }
-
-    function asString()
-    {
-        $xs = new XMLStringer(true);
-        $xs->elementStart('poco:address');
-        $xs->element('poco:formatted', null, $this->formatted);
-        $xs->elementEnd('poco:address');
-        return $xs->getString();
-    }
-}
-
-class PoCo
-{
-    const NS = 'http://portablecontacts.net/spec/1.0';
-
-    const USERNAME  = 'preferredUsername';
-    const NOTE      = 'note';
-    const URLS      = 'urls';
-
-    public $preferredUsername;
-    public $note;
-    public $address;
-    public $urls = array();
-
-    function __construct($profile)
-    {
-        $this->preferredUsername = $profile->nickname;
-
-        $this->note    = $profile->bio;
-        $this->address = new PoCoAddress($profile->location);
-
-        if (!empty($profile->homepage)) {
-            array_push(
-                $this->urls,
-                new PoCoURL(
-                    'homepage',
-                    $profile->homepage,
-                    true
-                )
-            );
-        }
-    }
-
-    function asString()
-    {
-        $xs = new XMLStringer(true);
-        $xs->element(
-            'poco:preferredUsername',
-            null,
-            $this->preferredUsername
-        );
-
-        if (!empty($this->note)) {
-            $xs->element('poco:note', null, $this->note);
-        }
-
-        if (!empty($this->address)) {
-            $xs->raw($this->address->asString());
-        }
-
-        foreach ($this->urls as $url) {
-            $xs->raw($url->asString());
-        }
-
-        return $xs->getString();
-    }
-}
-
-/**
- * Utilities for turning DOMish things into Activityish things
- *
- * Some common functions that I didn't have the bandwidth to try to factor
- * into some kind of reasonable superclass, so just dumped here. Might
- * be useful to have an ActivityObject parent class or something.
- *
- * @category  OStatus
- * @package   StatusNet
- * @author    Evan Prodromou <evan@status.net>
- * @copyright 2010 StatusNet, Inc.
- * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
- * @link      http://status.net/
- */
-
-class ActivityUtils
-{
-    const ATOM = 'http://www.w3.org/2005/Atom';
-
-    const LINK = 'link';
-    const REL  = 'rel';
-    const TYPE = 'type';
-    const HREF = 'href';
-
-    const CONTENT = 'content';
-    const SRC     = 'src';
-
-    /**
-     * Get the permalink for an Activity object
-     *
-     * @param DOMElement $element A DOM element
-     *
-     * @return string related link, if any
-     */
-
-    static function getPermalink($element)
-    {
-        return self::getLink($element, 'alternate', 'text/html');
-    }
-
-    /**
-     * Get the permalink for an Activity object
-     *
-     * @param DOMElement $element A DOM element
-     *
-     * @return string related link, if any
-     */
-
-    static function getLink($element, $rel, $type=null)
-    {
-        $links = $element->getElementsByTagnameNS(self::ATOM, self::LINK);
-
-        foreach ($links as $link) {
-
-            $linkRel = $link->getAttribute(self::REL);
-            $linkType = $link->getAttribute(self::TYPE);
-
-            if ($linkRel == $rel &&
-                (is_null($type) || $linkType == $type)) {
-                return $link->getAttribute(self::HREF);
-            }
-        }
-
-        return null;
-    }
-
-    /**
-     * Gets the first child element with the given tag
-     *
-     * @param DOMElement $element   element to pick at
-     * @param string     $tag       tag to look for
-     * @param string     $namespace Namespace to look under
-     *
-     * @return DOMElement found element or null
-     */
-
-    static function child($element, $tag, $namespace=self::ATOM)
-    {
-        $els = $element->childNodes;
-        if (empty($els) || $els->length == 0) {
-            return null;
-        } else {
-            for ($i = 0; $i < $els->length; $i++) {
-                $el = $els->item($i);
-                if ($el->localName == $tag && $el->namespaceURI == $namespace) {
-                    return $el;
-                }
-            }
-        }
-    }
-
-    /**
-     * Grab the text content of a DOM element child of the current element
-     *
-     * @param DOMElement $element   Element whose children we examine
-     * @param string     $tag       Tag to look up
-     * @param string     $namespace Namespace to use, defaults to Atom
-     *
-     * @return string content of the child
-     */
-
-    static function childContent($element, $tag, $namespace=self::ATOM)
-    {
-        $el = self::child($element, $tag, $namespace);
-
-        if (empty($el)) {
-            return null;
-        } else {
-            return $el->textContent;
-        }
-    }
-
-    /**
-     * Get the content of an atom:entry-like object
-     *
-     * @param DOMElement $element The element to examine.
-     *
-     * @return string unencoded HTML content of the element, like "This -&lt; is <b>HTML</b>."
-     *
-     * @todo handle remote content
-     * @todo handle embedded XML mime types
-     * @todo handle base64-encoded non-XML and non-text mime types
-     */
-
-    static function getContent($element)
-    {
-        $contentEl = ActivityUtils::child($element, self::CONTENT);
-
-        if (!empty($contentEl)) {
-
-            $src  = $contentEl->getAttribute(self::SRC);
-
-            if (!empty($src)) {
-                throw new ClientException(_("Can't handle remote content yet."));
-            }
-
-            $type = $contentEl->getAttribute(self::TYPE);
-
-            // slavishly following http://atompub.org/rfc4287.html#rfc.section.4.1.3.3
-
-            if ($type == 'text') {
-                return $contentEl->textContent;
-            } else if ($type == 'html') {
-                $text = $contentEl->textContent;
-                return htmlspecialchars_decode($text, ENT_QUOTES);
-            } else if ($type == 'xhtml') {
-                $divEl = ActivityUtils::child($contentEl, 'div');
-                if (empty($divEl)) {
-                    return null;
-                }
-                $doc = $divEl->ownerDocument;
-                $text = '';
-                $children = $divEl->childNodes;
-
-                for ($i = 0; $i < $children->length; $i++) {
-                    $child = $children->item($i);
-                    $text .= $doc->saveXML($child);
-                }
-                return trim($text);
-            } else if (in_array(array('text/xml', 'application/xml'), $type) ||
-                       preg_match('#(+|/)xml$#', $type)) {
-                throw new ClientException(_("Can't handle embedded XML content yet."));
-            } else if (strncasecmp($type, 'text/', 5)) {
-                return $contentEl->textContent;
-            } else {
-                throw new ClientException(_("Can't handle embedded Base64 content yet."));
-            }
-        }
-    }
-}
-
-/**
- * A noun-ish thing in the activity universe
- *
- * The activity streams spec talks about activity objects, while also having
- * a tag activity:object, which is in fact an activity object. Aaaaaah!
- *
- * This is just a thing in the activity universe. Can be the subject, object,
- * or indirect object (target!) of an activity verb. Rotten name, and I'm
- * propagating it. *sigh*
- *
- * @category  OStatus
- * @package   StatusNet
- * @author    Evan Prodromou <evan@status.net>
- * @copyright 2010 StatusNet, Inc.
- * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
- * @link      http://status.net/
- */
-
-class ActivityObject
-{
-    const ARTICLE   = 'http://activitystrea.ms/schema/1.0/article';
-    const BLOGENTRY = 'http://activitystrea.ms/schema/1.0/blog-entry';
-    const NOTE      = 'http://activitystrea.ms/schema/1.0/note';
-    const STATUS    = 'http://activitystrea.ms/schema/1.0/status';
-    const FILE      = 'http://activitystrea.ms/schema/1.0/file';
-    const PHOTO     = 'http://activitystrea.ms/schema/1.0/photo';
-    const ALBUM     = 'http://activitystrea.ms/schema/1.0/photo-album';
-    const PLAYLIST  = 'http://activitystrea.ms/schema/1.0/playlist';
-    const VIDEO     = 'http://activitystrea.ms/schema/1.0/video';
-    const AUDIO     = 'http://activitystrea.ms/schema/1.0/audio';
-    const BOOKMARK  = 'http://activitystrea.ms/schema/1.0/bookmark';
-    const PERSON    = 'http://activitystrea.ms/schema/1.0/person';
-    const GROUP     = 'http://activitystrea.ms/schema/1.0/group';
-    const PLACE     = 'http://activitystrea.ms/schema/1.0/place';
-    const COMMENT   = 'http://activitystrea.ms/schema/1.0/comment';
-    // ^^^^^^^^^^ tea!
-
-    // Atom elements we snarf
-
-    const TITLE   = 'title';
-    const SUMMARY = 'summary';
-    const ID      = 'id';
-    const SOURCE  = 'source';
-
-    const NAME  = 'name';
-    const URI   = 'uri';
-    const EMAIL = 'email';
-
-    public $element;
-    public $type;
-    public $id;
-    public $title;
-    public $summary;
-    public $content;
-    public $link;
-    public $source;
-    public $avatar;
-    public $geopoint;
-
-    /**
-     * Constructor
-     *
-     * This probably needs to be refactored
-     * to generate a local class (ActivityPerson, ActivityFile, ...)
-     * based on the object type.
-     *
-     * @param DOMElement $element DOM thing to turn into an Activity thing
-     */
-
-    function __construct($element = null)
-    {
-        if (empty($element)) {
-            return;
-        }
-
-        $this->element = $element;
-
-        if ($element->tagName == 'author') {
-
-            $this->type  = self::PERSON; // XXX: is this fair?
-            $this->title = $this->_childContent($element, self::NAME);
-            $this->id    = $this->_childContent($element, self::URI);
-
-            if (empty($this->id)) {
-                $email = $this->_childContent($element, self::EMAIL);
-                if (!empty($email)) {
-                    // XXX: acct: ?
-                    $this->id = 'mailto:'.$email;
-                }
-            }
-
-        } else {
-
-            $this->type = $this->_childContent($element, Activity::OBJECTTYPE,
-                                               Activity::SPEC);
-
-            if (empty($this->type)) {
-                $this->type = ActivityObject::NOTE;
-            }
-
-            $this->id      = $this->_childContent($element, self::ID);
-            $this->title   = $this->_childContent($element, self::TITLE);
-            $this->summary = $this->_childContent($element, self::SUMMARY);
-
-            $this->source  = $this->_getSource($element);
-
-            $this->content = ActivityUtils::getContent($element);
-
-            $this->link = ActivityUtils::getPermalink($element);
-
-            // XXX: grab PoCo stuff
-        }
-
-        // Some per-type attributes...
-        if ($this->type == self::PERSON || $this->type == self::GROUP) {
-            $this->displayName = $this->title;
-
-            // @fixme we may have multiple avatars with different resolutions specified
-            $this->avatar   = ActivityUtils::getLink($element, 'avatar');
-            $this->nickname = ActivityUtils::childContent($element, PoCo::USERNAME, PoCo::NS);
-        }
-    }
-
-    private function _childContent($element, $tag, $namespace=ActivityUtils::ATOM)
-    {
-        return ActivityUtils::childContent($element, $tag, $namespace);
-    }
-
-    // Try to get a unique id for the source feed
-
-    private function _getSource($element)
-    {
-        $sourceEl = ActivityUtils::child($element, 'source');
-
-        if (empty($sourceEl)) {
-            return null;
-        } else {
-            $href = ActivityUtils::getLink($sourceEl, 'self');
-            if (!empty($href)) {
-                return $href;
-            } else {
-                return ActivityUtils::childContent($sourceEl, 'id');
-            }
-        }
-    }
-
-    static function fromNotice($notice)
-    {
-        $object = new ActivityObject();
-
-        $object->type    = ActivityObject::NOTE;
-
-        $object->id      = $notice->uri;
-        $object->title   = $notice->content;
-        $object->content = $notice->rendered;
-        $object->link    = $notice->bestUrl();
-
-        return $object;
-    }
-
-    static function fromProfile($profile)
-    {
-        $object = new ActivityObject();
-
-        $object->type   = ActivityObject::PERSON;
-        $object->id     = $profile->getUri();
-        $object->title  = $profile->getBestName();
-        $object->link   = $profile->profileurl;
-        $object->avatar = $profile->getAvatar(AVATAR_PROFILE_SIZE);
-
-        if (isset($profile->lat) && isset($profile->lon)) {
-            $object->geopoint = (float)$profile->lat . ' ' . (float)$profile->lon;
-        }
-
-        $object->poco = new PoCo($profile);
-
-        return $object;
-    }
-
-    function asString($tag='activity:object')
-    {
-        $xs = new XMLStringer(true);
-
-        $xs->elementStart($tag);
-
-        $xs->element('activity:object-type', null, $this->type);
-
-        $xs->element(self::ID, null, $this->id);
-
-        if (!empty($this->title)) {
-            $xs->element(self::TITLE, null, $this->title);
-        }
-
-        if (!empty($this->summary)) {
-            $xs->element(self::SUMMARY, null, $this->summary);
-        }
-
-        if (!empty($this->content)) {
-            // XXX: assuming HTML content here
-            $xs->element(ActivityUtils::CONTENT, array('type' => 'html'), $this->content);
-        }
-
-        if (!empty($this->link)) {
-            $xs->element('link', array('rel' => 'alternate', 'type' => 'text/html'),
-                         $this->link);
-        }
-
-        if ($this->type == ActivityObject::PERSON) {
-            $xs->element(
-                'link', array(
-                    'type' => empty($this->avatar) ? 'image/png' : $this->avatar->mediatype,
-                    'rel'  => 'avatar',
-                    'href' => empty($this->avatar)
-                    ? Avatar::defaultImage(AVATAR_PROFILE_SIZE)
-                    : $this->avatar->displayUrl()
-                ),
-                ''
-            );
-        }
-
-        if (!empty($this->geopoint)) {
-            $xs->element(
-                'georss:point',
-                null,
-                $this->geopoint
-            );
-        }
-
-        if (!empty($this->poco)) {
-            $xs->raw($this->poco->asString());
-        }
-
-        $xs->elementEnd($tag);
-
-        return $xs->getString();
-    }
-}
-
-/**
- * Utility class to hold a bunch of constant defining default verb types
- *
- * @category  OStatus
- * @package   StatusNet
- * @author    Evan Prodromou <evan@status.net>
- * @copyright 2010 StatusNet, Inc.
- * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
- * @link      http://status.net/
- */
-
-class ActivityVerb
-{
-    const POST     = 'http://activitystrea.ms/schema/1.0/post';
-    const SHARE    = 'http://activitystrea.ms/schema/1.0/share';
-    const SAVE     = 'http://activitystrea.ms/schema/1.0/save';
-    const FAVORITE = 'http://activitystrea.ms/schema/1.0/favorite';
-    const PLAY     = 'http://activitystrea.ms/schema/1.0/play';
-    const FOLLOW   = 'http://activitystrea.ms/schema/1.0/follow';
-    const FRIEND   = 'http://activitystrea.ms/schema/1.0/make-friend';
-    const JOIN     = 'http://activitystrea.ms/schema/1.0/join';
-    const TAG      = 'http://activitystrea.ms/schema/1.0/tag';
-
-    // Custom OStatus verbs for the flipside until they're standardized
-    const DELETE     = 'http://ostatus.org/schema/1.0/unfollow';
-    const UNFAVORITE = 'http://ostatus.org/schema/1.0/unfavorite';
-    const UNFOLLOW   = 'http://ostatus.org/schema/1.0/unfollow';
-    const LEAVE      = 'http://ostatus.org/schema/1.0/leave';
-}
-
-class ActivityContext
-{
-    public $replyToID;
-    public $replyToUrl;
-    public $location;
-    public $attention = array();
-    public $conversation;
-
-    const THR     = 'http://purl.org/syndication/thread/1.0';
-    const GEORSS  = 'http://www.georss.org/georss';
-    const OSTATUS = 'http://ostatus.org/schema/1.0';
-
-    const INREPLYTO = 'in-reply-to';
-    const REF       = 'ref';
-    const HREF      = 'href';
-
-    const POINT     = 'point';
-
-    const ATTENTION    = 'ostatus:attention';
-    const CONVERSATION = 'ostatus:conversation';
-
-    function __construct($element)
-    {
-        $replyToEl = ActivityUtils::child($element, self::INREPLYTO, self::THR);
-
-        if (!empty($replyToEl)) {
-            $this->replyToID  = $replyToEl->getAttribute(self::REF);
-            $this->replyToUrl = $replyToEl->getAttribute(self::HREF);
-        }
-
-        $this->location = $this->getLocation($element);
-
-        $this->conversation = ActivityUtils::getLink($element, self::CONVERSATION);
-
-        // Multiple attention links allowed
-
-        $links = $element->getElementsByTagNameNS(ActivityUtils::ATOM, ActivityUtils::LINK);
-
-        for ($i = 0; $i < $links->length; $i++) {
-
-            $link = $links->item($i);
-
-            $linkRel = $link->getAttribute(ActivityUtils::REL);
-
-            if ($linkRel == self::ATTENTION) {
-                $this->attention[] = $link->getAttribute(self::HREF);
-            }
-        }
-    }
-
-    /**
-     * Parse location given as a GeoRSS-simple point, if provided.
-     * http://www.georss.org/simple
-     *
-     * @param feed item $entry
-     * @return mixed Location or false
-     */
-    function getLocation($dom)
-    {
-        $points = $dom->getElementsByTagNameNS(self::GEORSS, self::POINT);
-
-        for ($i = 0; $i < $points->length; $i++) {
-            $point = $points->item($i)->textContent;
-            $point = str_replace(',', ' ', $point); // per spec "treat commas as whitespace"
-            $point = preg_replace('/\s+/', ' ', $point);
-            $point = trim($point);
-            $coords = explode(' ', $point);
-            if (count($coords) == 2) {
-                list($lat, $lon) = $coords;
-                if (is_numeric($lat) && is_numeric($lon)) {
-                    common_log(LOG_INFO, "Looking up location for $lat $lon from georss");
-                    return Location::fromLatLon($lat, $lon);
-                }
-            }
-            common_log(LOG_ERR, "Ignoring bogus georss:point value $point");
-        }
-
-        return null;
-    }
-}
-
-/**
- * An activity in the ActivityStrea.ms world
- *
- * An activity is kind of like a sentence: someone did something
- * to something else.
- *
- * 'someone' is the 'actor'; 'did something' is the verb;
- * 'something else' is the object.
- *
- * @category  OStatus
- * @package   StatusNet
- * @author    Evan Prodromou <evan@status.net>
- * @copyright 2010 StatusNet, Inc.
- * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
- * @link      http://status.net/
- */
-
-class Activity
-{
-    const SPEC   = 'http://activitystrea.ms/spec/1.0/';
-    const SCHEMA = 'http://activitystrea.ms/schema/1.0/';
-
-    const VERB       = 'verb';
-    const OBJECT     = 'object';
-    const ACTOR      = 'actor';
-    const SUBJECT    = 'subject';
-    const OBJECTTYPE = 'object-type';
-    const CONTEXT    = 'context';
-    const TARGET     = 'target';
-
-    const ATOM = 'http://www.w3.org/2005/Atom';
-
-    const AUTHOR    = 'author';
-    const PUBLISHED = 'published';
-    const UPDATED   = 'updated';
-
-    public $actor;   // an ActivityObject
-    public $verb;    // a string (the URL)
-    public $object;  // an ActivityObject
-    public $target;  // an ActivityObject
-    public $context; // an ActivityObject
-    public $time;    // Time of the activity
-    public $link;    // an ActivityObject
-    public $entry;   // the source entry
-    public $feed;    // the source feed
-
-    public $summary; // summary of activity
-    public $content; // HTML content of activity
-    public $id;      // ID of the activity
-    public $title;   // title of the activity
-
-    /**
-     * Turns a regular old Atom <entry> into a magical activity
-     *
-     * @param DOMElement $entry Atom entry to poke at
-     * @param DOMElement $feed  Atom feed, for context
-     */
-
-    function __construct($entry = null, $feed = null)
-    {
-        if (is_null($entry)) {
-            return;
-        }
-
-        $this->entry = $entry;
-        $this->feed  = $feed;
-
-        $pubEl = $this->_child($entry, self::PUBLISHED, self::ATOM);
-
-        if (!empty($pubEl)) {
-            $this->time = strtotime($pubEl->textContent);
-        } else {
-            // XXX technically an error; being liberal. Good idea...?
-            $updateEl = $this->_child($entry, self::UPDATED, self::ATOM);
-            if (!empty($updateEl)) {
-                $this->time = strtotime($updateEl->textContent);
-            } else {
-                $this->time = null;
-            }
-        }
-
-        $this->link = ActivityUtils::getPermalink($entry);
-
-        $verbEl = $this->_child($entry, self::VERB);
-
-        if (!empty($verbEl)) {
-            $this->verb = trim($verbEl->textContent);
-        } else {
-            $this->verb = ActivityVerb::POST;
-            // XXX: do other implied stuff here
-        }
-
-        $objectEl = $this->_child($entry, self::OBJECT);
-
-        if (!empty($objectEl)) {
-            $this->object = new ActivityObject($objectEl);
-        } else {
-            $this->object = new ActivityObject($entry);
-        }
-
-        $actorEl = $this->_child($entry, self::ACTOR);
-
-        if (!empty($actorEl)) {
-
-            $this->actor = new ActivityObject($actorEl);
-
-        } else if (!empty($feed) &&
-                   $subjectEl = $this->_child($feed, self::SUBJECT)) {
-
-            $this->actor = new ActivityObject($subjectEl);
-
-        } else if ($authorEl = $this->_child($entry, self::AUTHOR, self::ATOM)) {
-
-            $this->actor = new ActivityObject($authorEl);
-
-        } else if (!empty($feed) && $authorEl = $this->_child($feed, self::AUTHOR,
-                                                              self::ATOM)) {
-
-            $this->actor = new ActivityObject($authorEl);
-        }
-
-        $contextEl = $this->_child($entry, self::CONTEXT);
-
-        if (!empty($contextEl)) {
-            $this->context = new ActivityContext($contextEl);
-        } else {
-            $this->context = new ActivityContext($entry);
-        }
-
-        $targetEl = $this->_child($entry, self::TARGET);
-
-        if (!empty($targetEl)) {
-            $this->target = new ActivityObject($targetEl);
-        }
-
-        $this->summary = ActivityUtils::childContent($entry, 'summary');
-        $this->id      = ActivityUtils::childContent($entry, 'id');
-        $this->content = ActivityUtils::getContent($entry);
-    }
-
-    /**
-     * Returns an Atom <entry> based on this activity
-     *
-     * @return DOMElement Atom entry
-     */
-
-    function toAtomEntry()
-    {
-        return null;
-    }
-
-    function asString($namespace=false)
-    {
-        $xs = new XMLStringer(true);
-
-        if ($namespace) {
-            $attrs = array('xmlns' => 'http://www.w3.org/2005/Atom',
-                           'xmlns:activity' => 'http://activitystrea.ms/spec/1.0/',
-                           'xmlns:ostatus' => 'http://ostatus.org/schema/1.0');
-        } else {
-            $attrs = array();
-        }
-
-        $xs->elementStart('entry', $attrs);
-
-        $xs->element('id', null, $this->id);
-        $xs->element('title', null, $this->title);
-        $xs->element('published', null, common_date_iso8601($this->time));
-        $xs->element('content', array('type' => 'html'), $this->content);
-
-        if (!empty($this->summary)) {
-            $xs->element('summary', null, $this->summary);
-        }
-
-        if (!empty($this->link)) {
-            $xs->element('link', array('rel' => 'alternate',
-                                       'type' => 'text/html'),
-                         $this->link);
-        }
-
-        // XXX: add context
-        // XXX: add target
-
-        $xs->raw($this->actor->asString('activity:actor'));
-        $xs->element('activity:verb', null, $this->verb);
-        $xs->raw($this->object->asString());
-
-        $xs->elementEnd('entry');
-
-        return $xs->getString();
-    }
-
-    private function _child($element, $tag, $namespace=self::SPEC)
-    {
-        return ActivityUtils::child($element, $tag, $namespace);
-    }
-}
\ No newline at end of file