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
{
/* Top level array representing the document */
protected $doc = array();
/* The current authenticated user */
protected $cur = null;
/**
* Constructor
*
* @param User $cur the current authenticated user
*/
function __construct($cur = null)
{
$this->cur = $cur;
/* Title of the JSON document */
$this->doc['title'] = null;
/* Array of activity items */
$this->doc['items'] = array();
/* Array of links associated with the document */
$this->doc['links'] = array();
}
/**
* Set the title of the document
*
* @param String $title the title
*/
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function setTitle($title)
{
$this->doc['title'] = $title;
}
/**
* Add more than one Item to the document
*
* @param mixed $notices an array of Notice objects or handle
*
*/
function addItemsFromNotices($notices)
{
common_debug("addItemsFromNotices");
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;
$act = $notice->asActivity();
$act->extra[] = $notice->noticeInfo($cur);
array_push($this->doc['items'], $act->asArray());
}
/**
* 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);
$this->doc['link'][] = $link->asArray();
}
/*
* Return the entire document as a big string of JSON
*
* @return string encoded JSON output
*/
function asString()
{
return json_encode(array_filter($this->doc));
}
}
/**
* 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,
$rel = null,
$duration = null
)
{
parent::__construct($url, $rel, $mediaType);
$this->linkDict = array(
'width' => $width,
'height' => $height,
'duration' => $duration
);
}
function asArray()
{
return array_merge(
parent::asArray(),
array_filter($this->linkDict)
);
}
}
/**
* 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);
}
}