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<?php
/**
* The core PHP Yadis implementation.
*
* PHP versions 4 and 5
*
* LICENSE: See the COPYING file included in this distribution.
*
* @package OpenID
* @author JanRain, Inc. <openid@janrain.com>
* @copyright 2005-2008 Janrain, Inc.
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache
*/
/**
* Need both fetcher types so we can use the right one based on the
* presence or absence of CURL.
*/
require_once "Auth/Yadis/PlainHTTPFetcher.php";
require_once "Auth/Yadis/ParanoidHTTPFetcher.php";
/**
* Need this for parsing HTML (looking for META tags).
*/
require_once "Auth/Yadis/ParseHTML.php";
/**
* Need this to parse the XRDS document during Yadis discovery.
*/
require_once "Auth/Yadis/XRDS.php";
/**
* XRDS (yadis) content type
*/
define('Auth_Yadis_CONTENT_TYPE', 'application/xrds+xml');
/**
* Yadis header
*/
define('Auth_Yadis_HEADER_NAME', 'X-XRDS-Location');
/**
* Contains the result of performing Yadis discovery on a URI.
*
* @package OpenID
*/
class Auth_Yadis_DiscoveryResult {
// The URI that was passed to the fetcher
var $request_uri = null;
// The result of following redirects from the request_uri
var $normalized_uri = null;
// The URI from which the response text was returned (set to
// None if there was no XRDS document found)
var $xrds_uri = null;
var $xrds = null;
// The content-type returned with the response_text
var $content_type = null;
// The document returned from the xrds_uri
var $response_text = null;
// Did the discovery fail miserably?
var $failed = false;
function Auth_Yadis_DiscoveryResult($request_uri)
{
// Initialize the state of the object
// sets all attributes to None except the request_uri
$this->request_uri = $request_uri;
}
function fail()
{
$this->failed = true;
}
function isFailure()
{
return $this->failed;
}
/**
* Returns the list of service objects as described by the XRDS
* document, if this yadis object represents a successful Yadis
* discovery.
*
* @return array $services An array of {@link Auth_Yadis_Service}
* objects
*/
function services()
{
if ($this->xrds) {
return $this->xrds->services();
}
return null;
}
function usedYadisLocation()
{
// Was the Yadis protocol's indirection used?
return ($this->xrds_uri && $this->normalized_uri != $this->xrds_uri);
}
function isXRDS()
{
// Is the response text supposed to be an XRDS document?
return ($this->usedYadisLocation() ||
$this->content_type == Auth_Yadis_CONTENT_TYPE);
}
}
/**
*
* Perform the Yadis protocol on the input URL and return an iterable
* of resulting endpoint objects.
*
* input_url: The URL on which to perform the Yadis protocol
*
* @return: The normalized identity URL and an iterable of endpoint
* objects generated by the filter function.
*
* xrds_parse_func: a callback which will take (uri, xrds_text) and
* return an array of service endpoint objects or null. Usually
* array('Auth_OpenID_ServiceEndpoint', 'fromXRDS').
*
* discover_func: if not null, a callback which should take (uri) and
* return an Auth_Yadis_Yadis object or null.
*/
function Auth_Yadis_getServiceEndpoints($input_url, $xrds_parse_func,
$discover_func=null, $fetcher=null)
{
if ($discover_func === null) {
$discover_function = array('Auth_Yadis_Yadis', 'discover');
}
$yadis_result = call_user_func_array($discover_func,
array($input_url, &$fetcher));
if ($yadis_result === null) {
return array($input_url, array());
}
$endpoints = call_user_func_array($xrds_parse_func,
array($yadis_result->normalized_uri,
$yadis_result->response_text));
if ($endpoints === null) {
$endpoints = array();
}
return array($yadis_result->normalized_uri, $endpoints);
}
/**
* This is the core of the PHP Yadis library. This is the only class
* a user needs to use to perform Yadis discovery. This class
* performs the discovery AND stores the result of the discovery.
*
* First, require this library into your program source:
*
* <pre> require_once "Auth/Yadis/Yadis.php";</pre>
*
* To perform Yadis discovery, first call the "discover" method
* statically with a URI parameter:
*
* <pre> $http_response = array();
* $fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
* $yadis_object = Auth_Yadis_Yadis::discover($uri,
* $http_response, $fetcher);</pre>
*
* If the discovery succeeds, $yadis_object will be an instance of
* {@link Auth_Yadis_Yadis}. If not, it will be null. The XRDS
* document found during discovery should have service descriptions,
* which can be accessed by calling
*
* <pre> $service_list = $yadis_object->services();</pre>
*
* which returns an array of objects which describe each service.
* These objects are instances of Auth_Yadis_Service. Each object
* describes exactly one whole Service element, complete with all of
* its Types and URIs (no expansion is performed). The common use
* case for using the service objects returned by services() is to
* write one or more filter functions and pass those to services():
*
* <pre> $service_list = $yadis_object->services(
* array("filterByURI",
* "filterByExtension"));</pre>
*
* The filter functions (whose names appear in the array passed to
* services()) take the following form:
*
* <pre> function myFilter($service) {
* // Query $service object here. Return true if the service
* // matches your query; false if not.
* }</pre>
*
* This is an example of a filter which uses a regular expression to
* match the content of URI tags (note that the Auth_Yadis_Service
* class provides a getURIs() method which you should use instead of
* this contrived example):
*
* <pre>
* function URIMatcher($service) {
* foreach ($service->getElements('xrd:URI') as $uri) {
* if (preg_match("/some_pattern/",
* $service->parser->content($uri))) {
* return true;
* }
* }
* return false;
* }</pre>
*
* The filter functions you pass will be called for each service
* object to determine which ones match the criteria your filters
* specify. The default behavior is that if a given service object
* matches ANY of the filters specified in the services() call, it
* will be returned. You can specify that a given service object will
* be returned ONLY if it matches ALL specified filters by changing
* the match mode of services():
*
* <pre> $yadis_object->services(array("filter1", "filter2"),
* SERVICES_YADIS_MATCH_ALL);</pre>
*
* See {@link SERVICES_YADIS_MATCH_ALL} and {@link
* SERVICES_YADIS_MATCH_ANY}.
*
* Services described in an XRDS should have a library which you'll
* probably be using. Those libraries are responsible for defining
* filters that can be used with the "services()" call. If you need
* to write your own filter, see the documentation for {@link
* Auth_Yadis_Service}.
*
* @package OpenID
*/
class Auth_Yadis_Yadis {
/**
* Returns an HTTP fetcher object. If the CURL extension is
* present, an instance of {@link Auth_Yadis_ParanoidHTTPFetcher}
* is returned. If not, an instance of
* {@link Auth_Yadis_PlainHTTPFetcher} is returned.
*
* If Auth_Yadis_CURL_OVERRIDE is defined, this method will always
* return a {@link Auth_Yadis_PlainHTTPFetcher}.
*/
static function getHTTPFetcher($timeout = 20)
{
if (Auth_Yadis_Yadis::curlPresent() &&
(!defined('Auth_Yadis_CURL_OVERRIDE'))) {
$fetcher = new Auth_Yadis_ParanoidHTTPFetcher($timeout);
} else {
$fetcher = new Auth_Yadis_PlainHTTPFetcher($timeout);
}
return $fetcher;
}
static function curlPresent()
{
return function_exists('curl_init');
}
/**
* @access private
*/
static function _getHeader($header_list, $names)
{
foreach ($header_list as $name => $value) {
foreach ($names as $n) {
if (strtolower($name) == strtolower($n)) {
return $value;
}
}
}
return null;
}
/**
* @access private
*/
static function _getContentType($content_type_header)
{
if ($content_type_header) {
$parts = explode(";", $content_type_header);
return strtolower($parts[0]);
}
}
/**
* This should be called statically and will build a Yadis
* instance if the discovery process succeeds. This implements
* Yadis discovery as specified in the Yadis specification.
*
* @param string $uri The URI on which to perform Yadis discovery.
*
* @param array $http_response An array reference where the HTTP
* response object will be stored (see {@link
* Auth_Yadis_HTTPResponse}.
*
* @param Auth_Yadis_HTTPFetcher $fetcher An instance of a
* Auth_Yadis_HTTPFetcher subclass.
*
* @param array $extra_ns_map An array which maps namespace names
* to namespace URIs to be used when parsing the Yadis XRDS
* document.
*
* @param integer $timeout An optional fetcher timeout, in seconds.
*
* @return mixed $obj Either null or an instance of
* Auth_Yadis_Yadis, depending on whether the discovery
* succeeded.
*/
static function discover($uri, $fetcher,
$extra_ns_map = null, $timeout = 20)
{
$result = new Auth_Yadis_DiscoveryResult($uri);
$request_uri = $uri;
$headers = array("Accept: " . Auth_Yadis_CONTENT_TYPE .
', text/html; q=0.3, application/xhtml+xml; q=0.5');
if ($fetcher === null) {
$fetcher = Auth_Yadis_Yadis::getHTTPFetcher($timeout);
}
$response = $fetcher->get($uri, $headers);
if (!$response || ($response->status != 200 and
$response->status != 206)) {
$result->fail();
return $result;
}
$result->normalized_uri = $response->final_url;
$result->content_type = Auth_Yadis_Yadis::_getHeader(
$response->headers,
array('content-type'));
if ($result->content_type &&
(Auth_Yadis_Yadis::_getContentType($result->content_type) ==
Auth_Yadis_CONTENT_TYPE)) {
$result->xrds_uri = $result->normalized_uri;
} else {
$yadis_location = Auth_Yadis_Yadis::_getHeader(
$response->headers,
array(Auth_Yadis_HEADER_NAME));
if (!$yadis_location) {
$parser = new Auth_Yadis_ParseHTML();
$yadis_location = $parser->getHTTPEquiv($response->body);
}
if ($yadis_location) {
$result->xrds_uri = $yadis_location;
$response = $fetcher->get($yadis_location);
if ((!$response) || ($response->status != 200 and
$response->status != 206)) {
$result->fail();
return $result;
}
$result->content_type = Auth_Yadis_Yadis::_getHeader(
$response->headers,
array('content-type'));
}
}
$result->response_text = $response->body;
return $result;
}
}
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