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<?php
/*
Copyright (c) 2009-2014 F3::Factory/Bong Cosca, All rights reserved.
This file is part of the Fat-Free Framework (http://fatfree.sf.net).
THE SOFTWARE AND DOCUMENTATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF
ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
PURPOSE.
Please see the license.txt file for more information.
*/
namespace Web;
//! OpenID consumer
class OpenID extends \Magic {
protected
//! OpenID provider endpoint URL
$url,
//! HTTP request parameters
$args=array();
/**
* Determine OpenID provider
* @return string|FALSE
* @param $proxy string
**/
protected function discover($proxy) {
// Normalize
if (!preg_match('/https?:\/\//i',$this->args['identity']))
$this->args['identity']='http://'.$this->args['identity'];
$url=parse_url($this->args['identity']);
// Remove fragment; reconnect parts
$this->args['identity']=$url['scheme'].'://'.
(isset($url['user'])?
($url['user'].
(isset($url['pass'])?(':'.$url['pass']):'').'@'):'').
strtolower($url['host']).(isset($url['path'])?$url['path']:'/').
(isset($url['query'])?('?'.$url['query']):'');
// HTML-based discovery of OpenID provider
$req=\Web::instance()->
request($this->args['identity'],array('proxy'=>$proxy));
if (!$req)
return FALSE;
$type=array_values(preg_grep('/Content-Type:/',$req['headers']));
if ($type &&
preg_match('/application\/xrds\+xml|text\/xml/',$type[0]) &&
($sxml=simplexml_load_string($req['body'])) &&
($xrds=json_decode(json_encode($sxml),TRUE)) &&
isset($xrds['XRD'])) {
// XRDS document
$svc=$xrds['XRD']['Service'];
if (isset($svc[0]))
$svc=$svc[0];
if (preg_grep('/http:\/\/specs\.openid\.net\/auth\/2.0\/'.
'(?:server|signon)/',$svc['Type'])) {
$this->args['provider']=$svc['URI'];
if (isset($svc['LocalID']))
$this->args['localidentity']=$svc['LocalID'];
elseif (isset($svc['CanonicalID']))
$this->args['localidentity']=$svc['CanonicalID'];
}
$this->args['server']=$svc['URI'];
if (isset($svc['Delegate']))
$this->args['delegate']=$svc['Delegate'];
}
else {
$len=strlen($req['body']);
$ptr=0;
// Parse document
while ($ptr<$len)
if (preg_match(
'/^<link\b((?:\h+\w+\h*=\h*'.
'(?:"(?:.+?)"|\'(?:.+?)\'))*)\h*\/?>/is',
substr($req['body'],$ptr),$parts)) {
if ($parts[1] &&
// Process attributes
preg_match_all('/\b(rel|href)\h*=\h*'.
'(?:"(.+?)"|\'(.+?)\')/s',$parts[1],$attr,
PREG_SET_ORDER)) {
$node=array();
foreach ($attr as $kv)
$node[$kv[1]]=isset($kv[2])?$kv[2]:$kv[3];
if (isset($node['rel']) &&
preg_match('/openid2?\.(\w+)/',
$node['rel'],$var) &&
isset($node['href']))
$this->args[$var[1]]=$node['href'];
}
$ptr+=strlen($parts[0]);
}
else
$ptr++;
}
// Get OpenID provider's endpoint URL
if (isset($this->args['provider'])) {
// OpenID 2.0
$this->args['ns']='http://specs.openid.net/auth/2.0';
if (isset($this->args['localidentity']))
$this->args['identity']=$this->args['localidentity'];
if (isset($this->args['trust_root']))
$this->args['realm']=$this->args['trust_root'];
}
elseif (isset($this->args['server'])) {
// OpenID 1.1
$this->args['ns']='http://openid.net/signon/1.1';
if (isset($this->args['delegate']))
$this->args['identity']=$this->args['delegate'];
}
if (isset($this->args['provider'])) {
// OpenID 2.0
if (empty($this->args['claimed_id']))
$this->args['claimed_id']=$this->args['identity'];
return $this->args['provider'];
}
elseif (isset($this->args['server']))
// OpenID 1.1
return $this->args['server'];
else
return FALSE;
}
/**
* Initiate OpenID authentication sequence; Return FALSE on failure
* or redirect to OpenID provider URL
* @return bool
* @param $proxy string
* @param $attr array
* @param $reqd string|array
**/
function auth($proxy=NULL,$attr=array(),array $reqd=NULL) {
$fw=\Base::instance();
$root=$fw->get('SCHEME').'://'.$fw->get('HOST');
if (empty($this->args['trust_root']))
$this->args['trust_root']=$root.$fw->get('BASE').'/';
if (empty($this->args['return_to']))
$this->args['return_to']=$root.$_SERVER['REQUEST_URI'];
$this->args['mode']='checkid_setup';
if ($this->url=$this->discover($proxy)) {
if ($attr) {
$this->args['ns.ax']='http://openid.net/srv/ax/1.0';
$this->args['ax.mode']='fetch_request';
foreach ($attr as $key=>$val)
$this->args['ax.type.'.$key]=$val;
$this->args['ax.required']=is_string($reqd)?
$reqd:implode(',',$reqd);
}
$var=array();
foreach ($this->args as $key=>$val)
$var['openid.'.$key]=$val;
$fw->reroute($this->url.'?'.http_build_query($var));
}
return FALSE;
}
/**
* Return TRUE if OpenID verification was successful
* @return bool
* @param $proxy string
**/
function verified($proxy=NULL) {
preg_match_all('/(?<=^|&)openid\.([^=]+)=([^&]+)/',
$_SERVER['QUERY_STRING'],$matches,PREG_SET_ORDER);
foreach ($matches as $match)
$this->args[$match[1]]=urldecode($match[2]);
if (isset($this->args['mode']) &&
$this->args['mode']!='error' &&
$this->url=$this->discover($proxy)) {
$this->args['mode']='check_authentication';
$var=array();
foreach ($this->args as $key=>$val)
$var['openid.'.$key]=$val;
$req=\Web::instance()->request(
$this->url,
array(
'method'=>'POST',
'content'=>http_build_query($var),
'proxy'=>$proxy
)
);
return (bool)preg_match('/is_valid:true/i',$req['body']);
}
return FALSE;
}
/**
* Return OpenID response fields
* @return array
**/
function response() {
return $this->args;
}
/**
* Return TRUE if OpenID request parameter exists
* @return bool
* @param $key string
**/
function exists($key) {
return isset($this->args[$key]);
}
/**
* Bind value to OpenID request parameter
* @return string
* @param $key string
* @param $val string
**/
function set($key,$val) {
return $this->args[$key]=$val;
}
/**
* Return value of OpenID request parameter
* @return mixed
* @param $key string
**/
function get($key) {
return isset($this->args[$key])?$this->args[$key]:NULL;
}
/**
* Remove OpenID request parameter
* @return NULL
* @param $key
**/
function clear($key) {
unset($this->args[$key]);
}
}
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