gnu-social/plugins/LRDD/extlib/XML/XRD.php

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<?php
/**
* Part of XML_XRD
*
* PHP version 5
*
* @category XML
* @package XML_XRD
* @author Christian Weiske <cweiske@php.net>
* @license http://www.gnu.org/copyleft/lesser.html LGPL
* @link http://pear.php.net/package/XML_XRD
*/
require_once 'XML/XRD/PropertyAccess.php';
require_once 'XML/XRD/Element/Link.php';
require_once 'XML/XRD/Loader.php';
require_once 'XML/XRD/Serializer.php';
/**
* Main class used to load XRD documents from string or file.
*
* After loading the file, access to links is possible with get() and getAll(),
* as well as foreach-iterating over the XML_XRD object.
*
* Property access is possible with getProperties() and array access (foreach)
* on the XML_XRD object.
*
* Verification that the subject/aliases match the requested URL can be done with
* describes().
*
* @category XML
* @package XML_XRD
* @author Christian Weiske <cweiske@php.net>
* @license http://www.gnu.org/copyleft/lesser.html LGPL
* @version Release: @package_version@
* @link http://pear.php.net/package/XML_XRD
*/
class XML_XRD extends XML_XRD_PropertyAccess implements IteratorAggregate
{
/**
* XRD file/string loading dispatcher
*
* @var XML_XRD_Loader
*/
public $loader;
/**
* XRD serializing dispatcher
*
* @var XML_XRD_Serializer
*/
public $serializer;
/**
* XRD subject
*
* @var string
*/
public $subject;
/**
* Array of subject alias strings
*
* @var array
*/
public $aliases = array();
/**
* Array of link objects
*
* @var array
*/
public $links = array();
/**
* Unix timestamp when the document expires.
* NULL when no expiry date set.
*
* @var integer|null
*/
public $expires;
/**
* xml:id of the XRD document
*
* @var string|null
*/
public $id;
/**
* Loads the contents of the given file.
*
* Note: Only use file type auto-detection for local files.
* Do not use it on remote files as the file gets requested several times.
*
* @param string $file Path to an XRD file
* @param string $type File type: xml or json, NULL for auto-detection
*
* @return void
*
* @throws XML_XRD_Loader_Exception When the file is invalid or cannot be
* loaded
*/
public function loadFile($file, $type = null)
{
if (!isset($this->loader)) {
$this->loader = new XML_XRD_Loader($this);
}
return $this->loader->loadFile($file, $type);
}
/**
* Loads the contents of the given string
*
* @param string $str XRD string
* @param string $type File type: xml or json, NULL for auto-detection
*
* @return void
*
* @throws XML_XRD_Loader_Exception When the string is invalid or cannot be
* loaded
*/
public function loadString($str, $type = null)
{
if (!isset($this->loader)) {
$this->loader = new XML_XRD_Loader($this);
}
return $this->loader->loadString($str, $type);
}
/**
* Checks if the XRD document describes the given URI.
*
* This should always be used to make sure the XRD file
* is the correct one for e.g. the given host, and not a copycat.
*
* Checks against the subject and aliases
*
* @param string $uri An URI that the document is expected to describe
*
* @return boolean True or false
*/
public function describes($uri)
{
if ($this->subject == $uri) {
return true;
}
foreach ($this->aliases as $alias) {
if ($alias == $uri) {
return true;
}
}
return false;
}
/**
* Get the link with highest priority for the given relation and type.
*
* @param string $rel Relation name
* @param string $type MIME Type
* @param boolean $typeFallback When true and no link with the given type
* could be found, the best link without a
* type will be returned
*
* @return XML_XRD_Element_Link Link object or NULL if none found
*/
public function get($rel, $type = null, $typeFallback = true)
{
$links = $this->getAll($rel, $type, $typeFallback);
if (count($links) == 0) {
return null;
}
return $links[0];
}
/**
* Get all links with the given relation and type, highest priority first.
*
* @param string $rel Relation name
* @param string $type MIME Type
* @param boolean $typeFallback When true and no link with the given type
* could be found, the best link without a
* type will be returned
*
* @return array Array of XML_XRD_Element_Link objects
*/
public function getAll($rel, $type = null, $typeFallback = true)
{
$links = array();
$exactType = false;
foreach ($this->links as $link) {
if ($link->rel == $rel
&& ($type === null || $link->type == $type
|| $typeFallback && $link->type === null)
) {
$links[] = $link;
$exactType |= $typeFallback && $type !== null
&& $link->type == $type;
}
}
if ($exactType) {
//remove all links without type
$exactlinks = array();
foreach ($links as $link) {
if ($link->type !== null) {
$exactlinks[] = $link;
}
}
$links = $exactlinks;
}
return $links;
}
/**
* Return the iterator object to loop over the links
*
* Part of the IteratorAggregate interface
*
* @return Traversable Iterator for the links
*/
public function getIterator()
{
return new ArrayIterator($this->links);
}
/**
* Converts this XRD object to XML or JSON.
*
* @param string $type Serialization type: xml or json
*
* @return string Generated content
*/
public function to($type)
{
if (!isset($this->serializer)) {
$this->serializer = new XML_XRD_Serializer($this);
}
return $this->serializer->to($type);
}
/**
* Converts this XRD object to XML.
*
* @return string Generated XML
*
* @deprecated use to('xml')
*/
public function toXML()
{
return $this->to('xml');
}
}
?>