gnu-social/lib/activitystreams/activitystreamjsondocument.php

187 lines
5.4 KiB
PHP
Raw Permalink Normal View History

<?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('GNUSOCIAL')) {
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 = [];
/* The current authenticated user */
protected $cur;
protected $scoped = null;
/* 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 $cur the current authenticated user
* @throws UserNoProfileException
*/
public function __construct($cur = null, $title = null, array $items = [], $links = null, $url = null)
{
parent::__construct($items, $url);
$this->cur = $cur ?: common_current_user();
$this->scoped = !is_null($this->cur) ? $this->cur->getProfile() : null;
/* 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) ? [] : $items;
/* URL of a document, this document? containing a list of all the items in the stream */
if (!empty($url)) {
$this->url = $url;
}
}
/**
* Set the title of the document
*
* @param string $title the title
*/
2011-02-17 02:55:13 +00:00
public function setTitle($title)
{
$this->title = $title;
}
public function setUrl($url)
{
$this->url = $url;
}
/**
* Add more than one Item to the document
*
* @param mixed $notices an array of Notice objects or handle
* @throws ClientException
* @throws ServerException
*/
public function addItemsFromNotices($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 $notice a Notice to add
*/
public function addItemFromNotice($notice)
{
try {
$act = $notice->asActivity($this->scoped);
} catch (Exception $e) {
// We know exceptions like
// "No result found on Fave lookup."
// may happen because of deleted notices etc.
// These are irrelevant for the feed purposes.
return;
}
$act->extra[] = $notice->noticeInfo($this->scoped);
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 $rel the link relationship
* @throws Exception
*/
public function addLink($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
*/
public function asString()
{
$this->doc['generator'] = 'GNU social ' . GNUSOCIAL_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
}
}