gnu-social/lib/activitystreams/activityobject.php

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<?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 Feed
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @author Zach Copley <zach@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
* @link http://status.net/
*/
if (!defined('GNUSOCIAL')) {
exit(1);
}
require_once(INSTALLDIR . '/lib/activitystreamjsondocument.php');
/**
* 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 _LIST = 'http://activitystrea.ms/schema/1.0/list'; // LIST is reserved
const PLACE = 'http://activitystrea.ms/schema/1.0/place';
const COMMENT = 'http://activitystrea.ms/schema/1.0/comment';
// ^^^^^^^^^^ tea!
const ACTIVITY = 'http://activitystrea.ms/schema/1.0/activity';
const SERVICE = 'http://activitystrea.ms/schema/1.0/service';
const IMAGE = 'http://activitystrea.ms/schema/1.0/image';
const COLLECTION = 'http://activitystrea.ms/schema/1.0/collection';
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const APPLICATION = 'http://activitystrea.ms/schema/1.0/application';
// 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';
const POSTEROUS = 'http://posterous.com/help/rss/1.0';
const AUTHOR = 'author';
const USERIMAGE = 'userImage';
const PROFILEURL = 'profileUrl';
const NICKNAME = 'nickName';
const DISPLAYNAME = 'displayName';
const MEDIA_DESCRIPTION = 'description';
public $element;
public $type;
public $id;
public $title;
public $summary;
public $content;
public $owner;
public $link; // think APP (Atom Publishing Protocol)
public $selfLink;
public $source;
public $avatarLinks = [];
public $geopoint;
public $poco;
// @todo move this stuff to it's own PHOTO activity object
public $displayName;
public $thumbnail;
public $largerImage;
public $description;
public $extra = [];
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public $stream;
/**
* Constructor
*
* This probably needs to be refactored
* to generate a local class (ActivityPerson, ActivityFile, ...)
* based on the object type.
*
* @param DOMElement $element DOM thing to turn into an Activity thing
*/
public function __construct($element = null)
{
if (empty($element)) {
return;
}
$this->element = $element;
$this->geopoint = $this->_childContent(
$element,
ActivityContext::POINT,
ActivityContext::GEORSS
);
if ($element->tagName == 'author') {
$this->_fromAuthor($element);
} elseif ($element->tagName == 'item') {
$this->_fromRssItem($element);
} else {
$this->_fromAtomEntry($element);
}
// Some per-type attributes...
if ($this->type == self::PERSON || $this->type == self::GROUP) {
$this->displayName = $this->title;
$photos = ActivityUtils::getLinks($element, 'photo');
if (count($photos)) {
foreach ($photos as $link) {
$this->avatarLinks[] = new AvatarLink($link);
}
} else {
$avatars = ActivityUtils::getLinks($element, 'avatar');
foreach ($avatars as $link) {
$this->avatarLinks[] = new AvatarLink($link);
}
}
$this->poco = new PoCo($element);
}
if ($this->type == self::PHOTO) {
$this->thumbnail = ActivityUtils::getLink($element, 'preview');
$this->largerImage = ActivityUtils::getLink($element, 'enclosure');
$this->description = ActivityUtils::childContent(
$element,
ActivityObject::MEDIA_DESCRIPTION,
Activity::MEDIA
);
}
if ($this->type == self::_LIST) {
$owner = ActivityUtils::child($this->element, Activity::AUTHOR, Activity::SPEC);
$this->owner = new ActivityObject($owner);
}
}
private function _childContent($element, $tag, $namespace = ActivityUtils::ATOM)
{
return ActivityUtils::childContent($element, $tag, $namespace);
}
private function _fromAuthor($element)
{
$this->type = $this->_childContent(
$element,
Activity::OBJECTTYPE,
Activity::SPEC
);
if (empty($this->type)) {
$this->type = self::PERSON; // XXX: is this fair?
}
// Start with <poco::displayName>
$this->title = ActivityUtils::childContent($element, PoCo::DISPLAYNAME, PoCo::NS);
// try falling back to <atom:title>
if (empty($this->title)) {
$title = ActivityUtils::childHtmlContent($element, self::TITLE);
if (!empty($title)) {
$this->title = common_strip_html($title);
}
}
// fall back to <atom:name> as a last resort
if (empty($this->title)) {
$this->title = $this->_childContent($element, self::NAME);
}
// start with <atom:id>
$this->id = $this->_childContent($element, self::ID);
// fall back to <atom:uri>
if (empty($this->id)) {
$this->id = $this->_childContent($element, self::URI);
}
// fall further back to <atom:email>
if (empty($this->id)) {
$email = $this->_childContent($element, self::EMAIL);
if (!empty($email)) {
// XXX: acct: ?
$this->id = 'mailto:' . $email;
}
}
$this->link = ActivityUtils::getPermalink($element);
// fall finally back to <link rel=alternate>
if (empty($this->id) && !empty($this->link)) { // fallback if there's no ID
$this->id = $this->link;
}
}
// @todo FIXME: rationalize with Activity::_fromRssItem()
private function _fromRssItem($item)
{
if (empty($this->type)) {
$this->type = ActivityObject::NOTE;
}
$this->title = ActivityUtils::childContent($item, ActivityObject::TITLE, Activity::RSS);
$contentEl = ActivityUtils::child($item, ActivityUtils::CONTENT, Activity::CONTENTNS);
if (!empty($contentEl)) {
$this->content = htmlspecialchars_decode($contentEl->textContent, ENT_QUOTES);
} else {
$descriptionEl = ActivityUtils::child($item, Activity::DESCRIPTION, Activity::RSS);
if (!empty($descriptionEl)) {
$this->content = htmlspecialchars_decode($descriptionEl->textContent, ENT_QUOTES);
}
}
$this->link = ActivityUtils::childContent($item, ActivityUtils::LINK, Activity::RSS);
$guidEl = ActivityUtils::child($item, Activity::GUID, Activity::RSS);
if (!empty($guidEl)) {
$this->id = $guidEl->textContent;
if ($guidEl->hasAttribute('isPermaLink') && $guidEl->getAttribute('isPermaLink') != 'false') {
// overwrites <link>
$this->link = $this->id;
}
}
}
private function _fromAtomEntry($element)
{
$this->type = $this->_childContent(
$element,
Activity::OBJECTTYPE,
Activity::SPEC
);
if (empty($this->type)) {
$this->type = ActivityObject::NOTE;
}
$this->summary = ActivityUtils::childHtmlContent($element, self::SUMMARY);
$this->content = ActivityUtils::getContent($element);
// We don't like HTML in our titles, although it's technically allowed
$this->title = common_strip_html(ActivityUtils::childHtmlContent($element, self::TITLE));
$this->source = $this->_getSource($element);
$this->link = ActivityUtils::getPermalink($element);
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$this->selfLink = ActivityUtils::getSelfLink($element);
$this->id = $this->_childContent($element, self::ID);
if (empty($this->id) && !empty($this->link)) { // fallback if there's no ID
$this->id = $this->link;
}
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$els = $element->childNodes;
for ($i = 0; $i < $els->length; $i++) {
$link = $els->item($i);
if ($link->localName == ActivityUtils::LINK && $link->namespaceURI == ActivityUtils::ATOM) {
$attrs = [];
foreach ($link->attributes as $attrName => $attrNode) {
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$attrs[$attrName] = $attrNode->nodeValue;
}
$this->extra[] = [$link->localName,
$attrs,
$link->nodeValue];
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}
}
}
private function _getSource($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');
}
}
}
public static function fromRssAuthor($el)
{
$text = $el->textContent;
if (preg_match('/^(.*?) \((.*)\)$/', $text, $match)) {
$email = $match[1];
$name = $match[2];
} elseif (preg_match('/^(.*?) <(.*)>$/', $text, $match)) {
$name = $match[1];
$email = $match[2];
} elseif (preg_match('/.*@.*/', $text)) {
$email = $text;
$name = null;
} else {
$name = $text;
$email = null;
}
// Not really enough info
$obj = new ActivityObject();
$obj->element = $el;
$obj->type = ActivityObject::PERSON;
$obj->title = $name;
if (!empty($email)) {
$obj->id = 'mailto:' . $email;
}
return $obj;
}
public static function fromDcCreator($el)
{
// Not really enough info
$text = $el->textContent;
$obj = new ActivityObject();
$obj->element = $el;
$obj->title = $text;
$obj->type = ActivityObject::PERSON;
return $obj;
}
public static function fromRssChannel($el)
{
$obj = new ActivityObject();
$obj->element = $el;
$obj->type = ActivityObject::PERSON; // @fixme guess better
$obj->title = ActivityUtils::childContent($el, ActivityObject::TITLE, Activity::RSS);
$obj->link = ActivityUtils::childContent($el, ActivityUtils::LINK, Activity::RSS);
$obj->id = ActivityUtils::getLink($el, Activity::SELF);
if (empty($obj->id)) {
$obj->id = $obj->link;
}
$desc = ActivityUtils::childContent($el, Activity::DESCRIPTION, Activity::RSS);
if (!empty($desc)) {
$obj->content = htmlspecialchars_decode($desc, ENT_QUOTES);
}
$imageEl = ActivityUtils::child($el, Activity::IMAGE, Activity::RSS);
if (!empty($imageEl)) {
$url = ActivityUtils::childContent($imageEl, Activity::URL, Activity::RSS);
$al = new AvatarLink();
$al->url = $url;
$obj->avatarLinks[] = $al;
}
return $obj;
}
// Try to get a unique id for the source feed
public static function fromPosterousAuthor($el)
{
$obj = new ActivityObject();
$obj->type = ActivityObject::PERSON; // @fixme any others...?
$userImage = ActivityUtils::childContent($el, self::USERIMAGE, self::POSTEROUS);
if (!empty($userImage)) {
$al = new AvatarLink();
$al->url = $userImage;
$obj->avatarLinks[] = $al;
}
$obj->link = ActivityUtils::childContent($el, self::PROFILEURL, self::POSTEROUS);
$obj->id = $obj->link;
$obj->poco = new PoCo();
$obj->poco->preferredUsername = ActivityUtils::childContent($el, self::NICKNAME, self::POSTEROUS);
$obj->poco->displayName = ActivityUtils::childContent($el, self::DISPLAYNAME, self::POSTEROUS);
$obj->title = $obj->poco->displayName;
return $obj;
}
public static function fromGroup(User_group $group)
{
$object = new ActivityObject();
if (Event::handle('StartActivityObjectFromGroup', [$group, &$object])) {
$object->type = ActivityObject::GROUP;
$object->id = $group->getUri();
$object->title = $group->getBestName();
$object->link = $group->getUri();
$object->avatarLinks[] = AvatarLink::fromFilename(
$group->homepage_logo,
AVATAR_PROFILE_SIZE
);
$object->avatarLinks[] = AvatarLink::fromFilename(
$group->stream_logo,
AVATAR_STREAM_SIZE
);
$object->avatarLinks[] = AvatarLink::fromFilename(
$group->mini_logo,
AVATAR_MINI_SIZE
);
$object->poco = PoCo::fromGroup($group);
Event::handle('EndActivityObjectFromGroup', [$group, &$object]);
}
return $object;
}
public static function fromPeopletag($ptag)
{
$object = new ActivityObject();
if (Event::handle('StartActivityObjectFromPeopletag', [$ptag, &$object])) {
$object->type = ActivityObject::_LIST;
$object->id = $ptag->getUri();
$object->title = $ptag->tag;
$object->summary = $ptag->description;
$object->link = $ptag->homeUrl();
$object->owner = Profile::getKV('id', $ptag->tagger);
$object->poco = PoCo::fromProfile($object->owner);
Event::handle('EndActivityObjectFromPeopletag', [$ptag, &$object]);
}
return $object;
}
public static function fromFile(File $file)
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{
$object = new ActivityObject();
if (Event::handle('StartActivityObjectFromFile', [$file, &$object])) {
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$object->type = self::mimeTypeToObjectType($file->mimetype);
$object->id = TagURI::mint(sprintf("file:%d", $file->id));
$object->link = $file->getAttachmentUrl();
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if ($file->title) {
$object->title = $file->title;
}
if ($file->date) {
$object->date = $file->date;
}
try {
$thumbnail = $file->getThumbnail();
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$object->thumbnail = $thumbnail;
} catch (UseFileAsThumbnailException $e) {
$object->thumbnail = null;
} catch (UnsupportedMediaException $e) {
$object->thumbnail = null;
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}
switch (self::canonicalType($object->type)) {
case 'image':
$object->largerImage = $file->getUrl();
break;
case 'video':
case 'audio':
$object->stream = $file->getUrl();
break;
}
Event::handle('EndActivityObjectFromFile', [$file, &$object]);
}
return $object;
}
public static function mimeTypeToObjectType($mimeType)
{
$ot = null;
// Default
if (empty($mimeType)) {
return self::FILE;
}
$parts = explode('/', $mimeType);
switch ($parts[0]) {
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case 'image':
$ot = self::IMAGE;
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break;
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case 'audio':
$ot = self::AUDIO;
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break;
case 'video':
$ot = self::VIDEO;
break;
default:
$ot = self::FILE;
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}
return $ot;
}
public static function canonicalType($type)
{
return ActivityUtils::resolveUri($type, true);
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}
public static function fromNoticeSource(Notice_source $source)
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{
$object = new ActivityObject();
$wellKnown = ['web', 'xmpp', 'mail', 'omb', 'system', 'api', 'ostatus',
'activity', 'feed', 'mirror', 'twitter', 'facebook'];
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if (Event::handle('StartActivityObjectFromNoticeSource', [$source, &$object])) {
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$object->type = ActivityObject::APPLICATION;
if (in_array($source->code, $wellKnown)) {
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// We use one ID for all well-known StatusNet sources
$object->id = "tag:status.net,2009:notice-source:" . $source->code;
} elseif ($source->url) {
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// They registered with an URL
$object->id = $source->url;
} else {
// Locally-registered, no URL
$object->id = TagURI::mint("notice-source:" . $source->code);
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}
if ($source->url) {
$object->link = $source->url;
}
if ($source->name) {
$object->title = $source->name;
} else {
$object->title = $source->code;
}
if ($source->created) {
$object->date = $source->created;
}
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$object->extra[] = ['status_net', ['source_code' => $source->code]];
Event::handle('EndActivityObjectFromNoticeSource', [$source, &$object]);
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}
return $object;
}
public static function fromMessage(Message $message)
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{
$object = new ActivityObject();
if (Event::handle('StartActivityObjectFromMessage', [$message, &$object])) {
$object->type = ActivityObject::NOTE;
$object->id = ($message->uri) ? $message->uri : (($message->url) ? $message->url : TagURI::mint(sprintf("message:%d", $message->id)));
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$object->content = $message->rendered;
$object->date = $message->created;
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if ($message->url) {
$object->link = $message->url;
} else {
$object->link = common_local_url('showmessage', ['message' => $message->id]);
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}
$object->extra[] = ['status_net', ['message_id' => $message->id]];
Event::handle('EndActivityObjectFromMessage', [$message, &$object]);
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}
return $object;
}
/*
* Returns an array based on this Activity Object suitable for
* encoding as JSON.
*
* @return array $object the activity object array
*/
public function asString($tag = 'activity:object')
{
$xs = new XMLStringer(true);
$this->outputTo($xs, $tag);
return $xs->getString();
}
public function outputTo($xo, $tag = 'activity:object')
{
if (!empty($tag)) {
$xo->elementStart($tag);
}
if (Event::handle('StartActivityObjectOutputAtom', [$this, $xo])) {
$xo->element('activity:object-type', null, $this->type);
// <author> uses URI
if ($tag == 'author') {
$xo->element(self::URI, null, $this->id);
} else {
$xo->element(self::ID, null, $this->id);
}
if (!empty($this->title)) {
$name = common_xml_safe_str($this->title);
if ($tag == 'author') {
// XXX: Backward compatibility hack -- atom:name should contain
// full name here, instead of nickname, i.e.: $name. Change
// this in the next version.
$xo->element(self::NAME, null, $this->poco->preferredUsername);
} else {
$xo->element(self::TITLE, null, $name);
}
}
if (!empty($this->summary)) {
$xo->element(
self::SUMMARY,
null,
common_xml_safe_str($this->summary)
);
}
if (!empty($this->content)) {
// XXX: assuming HTML content here
$xo->element(
ActivityUtils::CONTENT,
['type' => 'html'],
common_xml_safe_str($this->content)
);
}
if (!empty($this->link)) {
$xo->element(
'link',
[
'rel' => 'alternate',
'type' => 'text/html',
'href' => $this->link
]
);
}
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if (!empty($this->selfLink)) {
$xo->element(
'link',
[
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'rel' => 'self',
'type' => 'application/atom+xml',
'href' => $this->selfLink
]
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);
}
if (!empty($this->owner)) {
$owner = $this->owner->asActivityNoun(self::AUTHOR);
$xo->raw($owner);
}
if ($this->type == ActivityObject::PERSON
|| $this->type == ActivityObject::GROUP) {
foreach ($this->avatarLinks as $alink) {
$xo->element(
'link',
[
'rel' => 'avatar',
'type' => $alink->type,
'media:width' => $alink->width,
'media:height' => $alink->height,
'href' => $alink->url,
]
);
}
}
if (!empty($this->geopoint)) {
$xo->element(
'georss:point',
null,
$this->geopoint
);
}
if (!empty($this->poco)) {
$this->poco->outputTo($xo);
}
// @fixme there's no way here to make a tree; elements can only contain plaintext
// @fixme these may collide with JSON extensions
foreach ($this->extra as $el) {
list($extraTag, $attrs, $content) = array_pad($el, 3, null);
$xo->element($extraTag, $attrs, $content);
}
Event::handle('EndActivityObjectOutputAtom', [$this, $xo]);
}
if (!empty($tag)) {
$xo->elementEnd($tag);
}
return;
}
public function asArray()
{
$object = [];
if (Event::handle('StartActivityObjectOutputJson', [$this, &$object])) {
// XXX: attachments are added by Activity
// author (Add object for author? Could be useful for repeats.)
// content (Add rendered version of the notice?)
// downstreamDuplicates
// id
if ($this->id) {
$object['id'] = $this->id;
} elseif ($this->link) {
$object['id'] = $this->link;
}
if ($this->type == ActivityObject::PERSON
|| $this->type == ActivityObject::GROUP) {
// displayName
$object['displayName'] = $this->title;
// XXX: Not sure what the best avatar is to use for the
// author's "image". For now, I'm using the large size.
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$imgLink = null;
$avatarMediaLinks = [];
foreach ($this->avatarLinks as $a) {
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// Make a MediaLink for every other Avatar
$avatar = new ActivityStreamsMediaLink(
$a->url,
$a->width,
$a->height,
$a->type,
'avatar'
);
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// Find the big avatar to use as the "image"
if ($a->height == AVATAR_PROFILE_SIZE) {
$imgLink = $avatar;
}
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$avatarMediaLinks[] = $avatar->asArray();
}
if (!array_key_exists('status_net', $object)) {
$object['status_net'] = [];
}
$object['status_net']['avatarLinks'] = $avatarMediaLinks; // extension
// image
if (!empty($imgLink)) {
$object['image'] = $imgLink->asArray();
}
}
// objectType
//
// We can probably use the whole schema URL here but probably the
// relative simple name is easier to parse
$object['objectType'] = self::canonicalType($this->type);
// summary
$object['summary'] = $this->summary;
// content, usually rendered HTML
$object['content'] = $this->content;
// published (probably don't need. Might be useful for repeats.)
// updated (probably don't need this)
// TODO: upstreamDuplicates
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if ($this->link) {
$object['url'] = $this->link;
}
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/* Extensions */
// @fixme these may collide with XML extensions
// @fixme multiple tags of same name will overwrite each other
// @fixme text content from XML extensions will be lost
foreach ($this->extra as $e) {
list($objectName, $props, $txt) = array_pad($e, 3, null);
if (!empty($objectName)) {
$parts = explode(":", $objectName);
if (count($parts) == 2 && $parts[0] == "statusnet") {
if (!array_key_exists('status_net', $object)) {
$object['status_net'] = [];
}
$object['status_net'][$parts[1]] = $props;
} else {
$object[$objectName] = $props;
}
}
}
if (!empty($this->geopoint)) {
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list($lat, $lon) = explode(' ', $this->geopoint);
if (!empty($lat) && !empty($lon)) {
$object['location'] = [
'objectType' => 'place',
'position' => sprintf("%+02.5F%+03.5F/", $lat, $lon),
'lat' => $lat,
'lon' => $lon
];
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$loc = Location::fromLatLon((float)$lat, (float)$lon);
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if ($loc) {
$name = $loc->getName();
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if ($name) {
$object['location']['displayName'] = $name;
}
$url = $loc->getURL();
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if ($url) {
$object['location']['url'] = $url;
}
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}
}
}
if (!empty($this->poco)) {
$object['portablecontacts_net'] = array_filter($this->poco->asArray());
}
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if (!empty($this->thumbnail)) {
if (is_string($this->thumbnail)) {
$object['image'] = ['url' => $this->thumbnail];
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} else {
$object['image'] = ['url' => $this->thumbnail->getUrl()];
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if ($this->thumbnail->width) {
$object['image']['width'] = $this->thumbnail->width;
}
if ($this->thumbnail->height) {
$object['image']['height'] = $this->thumbnail->height;
}
}
}
switch (self::canonicalType($this->type)) {
case 'image':
if (!empty($this->largerImage)) {
$object['fullImage'] = ['url' => $this->largerImage];
}
break;
case 'audio':
case 'video':
if (!empty($this->stream)) {
$object['stream'] = ['url' => $this->stream];
}
break;
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}
Event::handle('EndActivityObjectOutputJson', [$this, &$object]);
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}
return array_filter($object);
}
public function getIdentifiers()
{
$ids = [];
foreach (['id', 'link', 'url'] as $id) {
if (isset($this->$id)) {
$ids[] = $this->$id;
}
}
return array_unique($ids);
}
}