gnu-social/lib/atom10feed.php

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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Class for building an Atom feed in memory
*
* 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 2010 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);
}
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class Atom10FeedException extends Exception
{
}
/**
* Class for building an Atom feed in memory. Get the finished doc
* as a string with Atom10Feed::getString().
*
* @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/
*/
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class Atom10Feed extends XMLStringer
{
public $xw;
// @fixme most of these should probably be read-only properties
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private $namespaces;
private $authors;
private $subject;
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private $categories;
private $contributors;
private $generator;
private $icon;
private $links;
private $selfLink;
private $selfLinkType;
public $logo;
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private $rights;
public $subtitle;
public $title;
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private $published;
private $updated;
private $entries;
/**
* Constructor
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*
* @param boolean $indent flag to turn indenting on or off
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*
* @return void
*/
function __construct($indent = true) {
parent::__construct($indent);
$this->namespaces = array();
$this->authors = array();
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$this->links = array();
$this->entries = array();
$this->addNamespace('', 'http://www.w3.org/2005/Atom');
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}
/**
* Add another namespace to the feed
*
* @param string $namespace the namespace
* @param string $uri namspace uri
*
* @return void
*/
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function addNamespace($namespace, $uri)
{
$ns = array($namespace => $uri);
$this->namespaces = array_merge($this->namespaces, $ns);
}
function addAuthor($name, $uri = null, $email = null)
{
$xs = new XMLStringer(true);
$xs->elementStart('author');
if (!empty($name)) {
$xs->element('name', null, $name);
} else {
throw new Atom10FeedException(
// TRANS: Atom feed exception thrown when an author element does not contain a name element.
_('Author element must contain a name element.')
);
}
if (isset($uri)) {
$xs->element('uri', null, $uri);
}
if (isset($email)) {
$xs->element('email', null, $email);
}
$xs->elementEnd('author');
array_push($this->authors, $xs->getString());
}
/**
* Add an Author to the feed via raw XML string
*
* @param string $xmlAuthor An XML string representation author
*
* @return void
*/
function addAuthorRaw($xmlAuthor)
{
array_push($this->authors, $xmlAuthor);
}
function renderAuthors()
{
foreach ($this->authors as $author) {
$this->raw($author);
}
}
/**
* Deprecated <activity:subject>; ignored
*
* @param string $xmlSubject An XML string representation of the subject
*
* @return void
*/
function setActivitySubject($xmlSubject)
{
// TRANS: Server exception thrown when using the method setActivitySubject() in the class Atom10Feed.
throw new ServerException(_('Do not use this method!'));
}
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function getNamespaces()
{
return $this->namespaces;
}
function initFeed()
{
$this->startXML();
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$commonAttrs = array('xml:lang' => 'en-US');
foreach ($this->namespaces as $prefix => $uri) {
if ($prefix == '') {
$attr = 'xmlns';
} else {
$attr = 'xmlns:' . $prefix;
}
$commonAttrs[$attr] = $uri;
}
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$this->elementStart('feed', $commonAttrs);
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$this->element(
'generator', array(
'uri' => 'http://status.net',
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'version' => STATUSNET_VERSION
),
'StatusNet'
);
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$this->element('id', null, $this->id);
$this->element('title', null, $this->title);
$this->element('subtitle', null, $this->subtitle);
if (!empty($this->logo)) {
$this->element('logo', null, $this->logo);
}
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$this->element('updated', null, $this->updated);
$this->renderAuthors();
if ($this->selfLink) {
$this->addLink($this->selfLink, array('rel' => 'self',
'type' => $this->selfLinkType));
}
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$this->renderLinks();
}
/**
* Check that all required elements have been set, etc.
* Throws an Atom10FeedException if something's missing.
*
* @return void
*/
function validate()
{
}
function renderLinks()
{
foreach ($this->links as $attrs)
{
$this->element('link', $attrs, null);
}
}
function addEntryRaw($xmlEntry)
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{
array_push($this->entries, $xmlEntry);
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}
function addEntry($entry)
{
array_push($this->entries, $entry->getString());
}
function renderEntries()
{
foreach ($this->entries as $entry) {
$this->raw($entry);
}
}
function endFeed()
{
$this->elementEnd('feed');
$this->xw->endDocument();
}
function getString()
{
if (Event::handle('StartApiAtom', array($this))) {
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$this->validate();
$this->initFeed();
if (!empty($this->subject)) {
$this->raw($this->subject);
}
$this->renderEntries();
$this->endFeed();
Event::handle('EndApiAtom', array($this));
}
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return $this->xw->outputMemory();
}
function setId($id)
{
$this->id = $id;
}
function setSelfLink($url, $type='application/atom+xml')
{
$this->selfLink = $url;
$this->selfLinkType = $type;
}
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function setTitle($title)
{
$this->title = $title;
}
function setSubtitle($subtitle)
{
$this->subtitle = $subtitle;
}
function setLogo($logo)
{
$this->logo = $logo;
}
function setUpdated($dt)
{
$this->updated = common_date_iso8601($dt);
}
function setPublished($dt)
{
$this->published = common_date_iso8601($dt);
}
/**
* Adds a link element into the Atom document
*
* Assumes you want rel="alternate" and type="text/html" unless
* you send in $otherAttrs.
*
* @param string $uri the uri the href needs to point to
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* @param array $otherAttrs other attributes to stick in
*
* @return void
*/
function addLink($uri, $otherAttrs = null) {
$attrs = array('href' => $uri);
if (is_null($otherAttrs)) {
$attrs['rel'] = 'alternate';
$attrs['type'] = 'text/html';
} else {
$attrs = array_merge($attrs, $otherAttrs);
}
array_push($this->links, $attrs);
}
}