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<?php
/**
 * FREE TO USE
 * Simple OpenID PHP Class
 * Contributed by http://www.fivestores.com/
 */

class openid
{
    public $openid_url_identity;
    public $URLs = array();
    public $error = array();
    public $fields = array('required' => array(),
        'optional' => array(),
        );

function ErrorStore($code, $desc = null)
    {
        $errs['OPENID_NOSERVERSFOUND'] = 'Cannot find OpenID Server TAG on Identity page.';
        if ($desc == null)
        {
            $desc = $errs[$code];
        }
        $this->error = array($code, $desc);
    }

function IsError()
    {
        if (count($this->error) > 0)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

function OpenID_Standarize($openid_identity = null)
    {
        if ($openid_identity === null)
            $openid_identity = $this->openid_url_identity;

$u = parse_url(strtolower(trim($openid_identity)));

if (!isset($u['path']) || ($u['path'] == '/'))
        {
            $u['path'] = '';
        }
        if (substr($u['path'], -1, 1) == '/')
        {
            $u['path'] = substr($u['path'], 0, strlen($u['path'])-1);
        }
        if (isset($u['query'])) // If there is a query string, then use identity as is
            {
                return $u['host'] . $u['path'] . '?' . $u['query'];
        }
        else
        {
            return $u['host'] . $u['path'];
        }
    }

if ($info['timed_out'])
            {
                $this->ErrorStore('OPENID_SOCKETTIMEOUT');
            }
            else
            {
                return $res;
            }
        }
    }
    function CURL_Request($url, $method = "GET", $params = "") // Remember, SSL MUST BE SUPPORTED
    {
        if (is_array($params)) $params = $this->array2url($params);
        $curl = curl_init($url . ($method == "GET" && $params != "" ? "?" . $params : ""));
        @curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($curl, CURLOPT_HEADER, false);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_HTTPGET, ($method == "GET"));
        curl_setopt($curl, CURLOPT_POST, ($method == "POST"));
        if ($method == "POST") curl_setopt($curl, CURLOPT_POSTFIELDS, $params);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        $response = curl_exec($curl);

if (curl_errno($curl) == 0)
        {
            $response;
        }
        else
        {
            $this->ErrorStore('OPENID_CURL', curl_error($curl));
        }
        return $response;
    }

function HTML2OpenIDServer($content)
    {
        $get = array();
        // Get details of their OpenID server and (optional) delegate
        preg_match_all('/<link[^>]*rel=[\'"]openid.server[\'"][^>]*href=[\'"]([^\'"]+)[\'"][^>]*\/?>/i', $content, $matches1);
        preg_match_all('/<link[^>]*href=\'"([^\'"]+)[\'"][^>]*rel=[\'"]openid.server[\'"][^>]*\/?>/i', $content, $matches2);
        $servers = array_merge($matches1[1], $matches2[1]);

preg_match_all('/<link[^>]*rel=[\'"]openid.delegate[\'"][^>]*href=[\'"]([^\'"]+)[\'"][^>]*\/?>/i', $content, $matches1);

preg_match_all('/<link[^>]*href=[\'"]([^\'"]+)[\'"][^>]*rel=[\'"]openid.delegate[\'"][^>]*\/?>/i', $content, $matches2);

$delegates = array_merge($matches1[1], $matches2[1]);

$ret = array($servers, $delegates);
        return $ret;
    }

function GetRedirectURL()
    {
        $params = array();
        $params['openid.return_to'] = urlencode($this->URLs['approved']);
        $params['openid.mode'] = 'checkid_setup';
        $params['openid.identity'] = urlencode($this->openid_url_identity);
        $params['openid.trust_root'] = urlencode($this->URLs['trust_root']);

if (isset($this->fields['required']) && (count($this->fields['required']) > 0))
        {
            $params['openid.sreg.required'] = implode(',', $this->fields['required']);
        }
        if (isset($this->fields['optional']) && (count($this->fields['optional']) > 0))
        {
            $params['openid.sreg.optional'] = implode(',', $this->fields['optional']);
        }
        return $this->URLs['openid_server'] . "?" . $this->array2url($params);
    }

function ValidateWithServer()
    {
        $params = array('openid.assoc_handle' => urlencode($_GET['openid_assoc_handle']),
            'openid.signed' => urlencode($_GET['openid_signed']),
            'openid.sig' => urlencode($_GET['openid_sig'])
            );
        // Send only required parameters to confirm validity
        $arr_signed = explode(",", str_replace('sreg.', 'sreg_', $_GET['openid_signed']));
        for ($i = 0; $i < count($arr_signed); $i++)
        {
            $s = str_replace('sreg_', 'sreg.', $arr_signed[$i]);
            $c = $_GET['openid_' . $arr_signed[$i]];
            // if ($c != ""){
            $params['openid.' . $s] = urlencode($c);
            // }
        }
        $params['openid.mode'] = "check_authentication";

$openid_server = $this->GetOpenIDServer();
        if ($openid_server == false)
        {
            return false;
        }
        $response = $this->CURL_Request($openid_server, 'POST', $params);
        $data = $this->splitResponse($response);

if ($data['is_valid'] == "true")
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}