gnu-social/lib/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('STATUSNET')) {
exit(1);
}
/**
* 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';
const POSTEROUS = 'http://posterous.com/help/rss/1.0';
const AUTHOR = 'author';
const USERIMAGE = 'userImage';
const PROFILEURL = 'profileUrl';
const NICKNAME = 'nickName';
const DISPLAYNAME = 'displayName';
public $element;
public $type;
public $id;
public $title;
public $summary;
public $content;
public $link;
public $source;
public $avatarLinks = array();
public $geopoint;
public $poco;
public $displayName;
// @todo move this stuff to it's own PHOTO activity object
const MEDIA_DESCRIPTION = 'description';
public $thumbnail;
public $largerImage;
public $description;
public $extra = array();
/**
* 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;
$this->geopoint = $this->_childContent(
$element,
ActivityContext::POINT,
ActivityContext::GEORSS
);
if ($element->tagName == 'author') {
$this->_fromAuthor($element);
} else if ($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(
$element,
ActivityObject::MEDIA_DESCRIPTION,
Activity::MEDIA
);
}
}
private function _fromAuthor($element)
{
$this->type = $this->_childContent($element,
Activity::OBJECTTYPE,
Activity::SPEC);
if (empty($this->type)) {
$this->type = self::PERSON; // XXX: is this fair?
}
// start with <atom:title>
$title = ActivityUtils::childHtmlContent($element, self::TITLE);
if (!empty($title)) {
$this->title = html_entity_decode(strip_tags($title), ENT_QUOTES, 'UTF-8');
}
// fall back to <atom:name>
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 = $this->link;
}
}
private function _fromAtomEntry($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
$title = ActivityUtils::childHtmlContent($element, self::TITLE);
$this->title = html_entity_decode(strip_tags($title), ENT_QUOTES, 'UTF-8');
$this->source = $this->_getSource($element);
$this->link = ActivityUtils::getPermalink($element);
$this->id = $this->_childContent($element, self::ID);
if (empty($this->id) && !empty($this->link)) { // fallback if there's no ID
$this->id = $this->link;
}
}
// @todo FIXME: rationalize with Activity::_fromRssItem()
private function _fromRssItem($item)
{
$this->title = ActivityUtils::childContent($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')) {
// overwrites <link>
$this->link = $this->id;
}
}
}
public static function fromRssAuthor($el)
{
$text = $el->textContent;
if (preg_match('/^(.*?) \((.*)\)$/', $text, $match)) {
$email = $match[1];
$name = $match[2];
} else if (preg_match('/^(.*?) <(.*)>$/', $text, $match)) {
$name = $match[1];
$email = $match[2];
} else if (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 $obj;
}
public static function fromPosterousAuthor($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 $obj;
}
private function _childContent($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 $notice)
{
$object = new ActivityObject();
if (Event::handle('StartActivityObjectFromNotice', array($notice, &$object))) {
$object->type = (empty($notice->object_type)) ? ActivityObject::NOTE : $notice->object_type;
$object->id = $notice->uri;
$object->title = $notice->content;
$object->content = $notice->rendered;
$object->link = $notice->bestUrl();
Event::handle('EndActivityObjectFromNotice', array($notice, &$object));
}
return $object;
}
static function fromProfile(Profile $profile)
{
$object = new ActivityObject();
if (Event::handle('StartActivityObjectFromProfile', array($profile, &$object))) {
$object->type = ActivityObject::PERSON;
$object->id = $profile->getUri();
$object->title = $profile->getBestName();
$object->link = $profile->profileurl;
$orig = $profile->getOriginalAvatar();
if (!empty($orig)) {
$object->avatarLinks[] = AvatarLink::fromAvatar($orig);
}
$sizes = array(
AVATAR_PROFILE_SIZE,
AVATAR_STREAM_SIZE,
AVATAR_MINI_SIZE
);
foreach ($sizes as $size) {
$alink = null;
$avatar = $profile->getAvatar($size);
if (!empty($avatar)) {
$alink = AvatarLink::fromAvatar($avatar);
} else {
$alink = new AvatarLink();
$alink->type = 'image/png';
$alink->height = $size;
$alink->width = $size;
$alink->url = Avatar::defaultImage($size);
if ($size == AVATAR_PROFILE_SIZE) {
// Hack for Twitter import: we don't have a 96x96 image,
// but we do have a 73x73 image. For now, fake it with that.
$avatar = $profile->getAvatar(73);
if ($avatar) {
$alink = AvatarLink::fromAvatar($avatar);
$alink->height= $size;
$alink->width = $size;
}
}
}
$object->avatarLinks[] = $alink;
}
if (isset($profile->lat) && isset($profile->lon)) {
$object->geopoint = (float)$profile->lat
. ' ' . (float)$profile->lon;
}
$object->poco = PoCo::fromProfile($profile);
Event::handle('EndActivityObjectFromProfile', array($profile, &$object));
}
return $object;
}
static function fromGroup($group)
{
$object = new ActivityObject();
if (Event::handle('StartActivityObjectFromGroup', array($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', array($group, &$object));
}
return $object;
}
function outputTo($xo, $tag='activity:object')
{
if (!empty($tag)) {
$xo->elementStart($tag);
}
$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
$xo->element(
ActivityUtils::CONTENT,
array('type' => 'html'),
common_xml_safe_str($this->content)
);
}
if (!empty($this->link)) {
$xo->element(
'link',
array(
'rel' => 'alternate',
'type' => 'text/html',
'href' => $this->link
),
null
);
}
if ($this->type == ActivityObject::PERSON
|| $this->type == ActivityObject::GROUP) {
foreach ($this->avatarLinks as $avatar) {
$xo->element(
'link', array(
'rel' => 'avatar',
'type' => $avatar->type,
'media:width' => $avatar->width,
'media:height' => $avatar->height,
'href' => $avatar->url
),
null
);
}
}
if (!empty($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) = $el;
$xo->element($extraTag, $attrs, $content);
}
if (!empty($tag)) {
$xo->elementEnd($tag);
}
return;
}
function asString($tag='activity:object')
{
$xs = new XMLStringer(true);
$this->outputTo($xs, $tag);
return $xs->getString();
}
/*
* Returns an array based on this Activity Object suitable for
* encoding as JSON.
*
* @return array $object the activity object array
*/
function asArray()
{
$object = array();
// XXX: attachedObjects are added by Activity
// displayName
$object['displayName'] = $this->title;
// TODO: downstreamDuplicates
// embedCode (used for video)
// id
//
// XXX: Should we use URL here? or a crazy tag URI?
$object['id'] = $this->id;
if ($this->type == ActivityObject::PERSON
|| $this->type == ActivityObject::GROUP) {
// XXX: Not sure what the best avatar is to use for the
2011-02-17 02:55:13 +00:00
// author's "image". For now, I'm using the large size.
$avatarLarge = null;
$avatarMediaLinks = array();
foreach ($this->avatarLinks as $a) {
2011-02-17 02:55:13 +00:00
// Make a MediaLink for every other Avatar
$avatar = new ActivityStreamsMediaLink(
$a->url,
$a->width,
$a->height,
$a->type,
'avatar'
);
// Find the big avatar to use as the "image"
if ($a->height == AVATAR_PROFILE_SIZE) {
$imgLink = $avatar;
}
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$avatarMediaLinks[] = $avatar->asArray();
}
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$object['avatarLinks'] = $avatarMediaLinks; // extension
2011-02-17 02:55:13 +00:00
// image
$object['image'] = $imgLink->asArray();
}
// objectType
//
// We can probably use the whole schema URL here but probably the
// relative simple name is easier to parse
// @fixme this breaks extension URIs
$object['type'] = substr($this->type, strrpos($this->type, '/') + 1);
// summary
$object['summary'] = $this->summary;
// TODO: upstreamDuplicates
// url (XXX: need to put the right thing here...)
$object['url'] = $this->id;
2011-02-17 02:55:13 +00:00
/* Extensions */
// @fixme these may collide with XML extensions
// @fixme multiple tags of same name will overwrite each other
// @fixme text content from XML extensions will be lost
2011-02-17 02:55:13 +00:00
foreach ($this->extra as $e) {
list($objectName, $props, $txt) = $e;
$object[$objectName] = $props;
}
// GeoJSON
if (!empty($this->geopoint)) {
list($lat, $long) = explode(' ', $this->geopoint);
$object['geopoint'] = array(
'type' => 'Point',
'coordinates' => array($lat, $long)
);
}
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if (!empty($this->poco)) {
$object['contact'] = $this->poco->asArray();
}
return array_filter($object);
}
}