gnu-social/lib/activitystreamjsondocument.php

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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Class for serializing Activity Streams in JSON
*
* 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 Zach Copley <zach@status.net>
* @copyright 2011 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET'))
{
exit(1);
}
/**
* A class for generating JSON documents that represent an Activity Streams
*
* @category Feed
* @package StatusNet
* @author Zach Copley <zach@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class ActivityStreamJSONDocument extends JSONActivityCollection
{
// Note: Lot of AS folks think the content type should be:
// 'application/stream+json; charset=utf-8', but this is more
// useful at the moment, because some programs actually understand
// it.
const CONTENT_TYPE = 'application/json; charset=utf-8';
/* Top level array representing the document */
protected $doc = array();
/* The current authenticated user */
protected $cur;
/* Title of the document */
protected $title;
/* Links associated with this document */
protected $links;
/* Count of items in this document */
// XXX This is cryptically referred to in the spec: "The Stream serialization MAY contain a count property."
protected $count;
/**
* Constructor
*
* @param User $cur the current authenticated user
*/
function __construct($cur = null, $title = null, $items = null, $links = null, $url = null)
{
parent::__construct($items, $url);
$this->cur = $cur;
/* Title of the JSON document */
$this->title = $title;
if (!empty($items)) {
$this->count = count($this->items);
}
/* Array of links associated with the document */
$this->links = empty($links) ? array() : $items;
/* URL of a document, this document? containing a list of all the items in the stream */
if (!empty($this->url)) {
$this->url = $this->url;
}
}
/**
* Set the title of the document
*
* @param String $title the title
*/
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function setTitle($title)
{
$this->title = $title;
}
function setUrl($url)
{
$this->url = $url;
}
/**
* Add more than one Item to the document
*
* @param mixed $notices an array of Notice objects or handle
*
*/
function addItemsFromNotices($notices)
{
if (is_array($notices)) {
foreach ($notices as $notice) {
$this->addItemFromNotice($notice);
}
} else {
while ($notices->fetch()) {
$this->addItemFromNotice($notices);
}
}
}
/**
* Add a single Notice to the document
*
* @param Notice $notice a Notice to add
*/
function addItemFromNotice($notice)
{
$cur = empty($this->cur) ? common_current_user() : $this->cur;
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$act = $notice->asActivity($cur);
$act->extra[] = $notice->noticeInfo($cur);
array_push($this->items, $act->asArray());
$this->count++;
}
/**
* Add a link to the JSON document
*
* @param string $url the URL for the link
* @param string $rel the link relationship
*/
function addLink($url = null, $rel = null, $mediaType = null)
{
$link = new ActivityStreamsLink($url, $rel, $mediaType);
array_push($this->links, $link->asArray());
}
/*
* Return the entire document as a big string of JSON
*
* @return string encoded JSON output
*/
function asString()
{
$this->doc['generator'] = 'StatusNet ' . STATUSNET_VERSION; // extension
$this->doc['title'] = $this->title;
$this->doc['url'] = $this->url;
$this->doc['totalItems'] = $this->count;
$this->doc['items'] = $this->items;
$this->doc['links'] = $this->links; // extension
return json_encode(array_filter($this->doc)); // filter out empty elements
}
}
/**
* A class for representing MediaLinks in JSON Activities
*
* @category Feed
* @package StatusNet
* @author Zach Copley <zach@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class ActivityStreamsMediaLink extends ActivityStreamsLink
{
private $linkDict;
function __construct(
$url = null,
$width = null,
$height = null,
$mediaType = null, // extension
$rel = null, // extension
$duration = null
)
{
parent::__construct($url, $rel, $mediaType);
$this->linkDict = array(
'width' => $width,
'height' => $height,
'duration' => $duration
);
}
function asArray()
{
return array_merge(
parent::asArray(),
array_filter($this->linkDict)
);
}
}
/*
* Collection primarily as the root of an Activity Streams doc but can be used as the value
* of extension properties in a variety of situations.
*
* A valid Collection object serialization MUST contain at least the url or items properties.
*/
class JSONActivityCollection {
/* Non-negative integer specifying the total number of activities within the stream */
protected $totalItems;
/* An array containing a listing of Objects of any object type */
protected $items;
/* IRI referencing a JSON document containing the full listing of objects in the collection */
protected $url;
/**
* Constructor
*
* @param array $items array of activity items
* @param string $url url of a doc list all the objs in the collection
* @param int $totalItems total number of items in the collection
*/
function __construct($items = null, $url = null)
{
$this->items = empty($items) ? array() : $items;
$this->totalItems = count($items);
$this->url = $url;
}
/**
* Get the total number of items in the collection
*
* @return int total the total
*/
public function getTotalItems()
{
$this->totalItems = count($items);
return $this->totalItems;
}
}
/**
* A class for representing links in JSON Activities
*
* @category Feed
* @package StatusNet
* @author Zach Copley <zach@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class ActivityStreamsLink
{
private $linkDict;
function __construct($url = null, $rel = null, $mediaType = null)
{
// links MUST have a URL
if (empty($url)) {
throw new Exception('Links must have a URL.');
}
$this->linkDict = array(
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'url' => $url,
'rel' => $rel, // extension
'type' => $mediaType // extension
);
}
function asArray()
{
return array_filter($this->linkDict);
}
}