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git-svn-id: http://xe-core.googlecode.com/svn/sandbox@2327 201d5d3c-b55e-5fd7-737f-ddc643e51545
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314
modules/member/openid_lib/class.openid.php
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314
modules/member/openid_lib/class.openid.php
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<?
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/*
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FREE TO USE
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Simple OpenID PHP Class
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Contributed by http://www.fivestores.com/
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-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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This Class was written to make easy for you to integrate OpenID on your website.
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This is just a client, which checks for user's identity. This Class Requires CURL Module.
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It should be easy to use some other HTTP Request Method, but remember, often OpenID servers
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are using SSL.
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We need to be able to perform SSL Verification on the background to check for valid signature.
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HOW TO USE THIS CLASS:
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STEP 1)
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$openid = new SimpleOpenID;
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:: SET IDENTITY ::
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$openid->SetIdentity($_POST['openid_url']);
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:: SET RETURN URL ::
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$openid->SetApprovedURL('http://www.yoursite.com/return.php'); // Script which handles a response from OpenID Server
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:: SET TRUST ROOT ::
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$openid->SetTrustRoot('http://www.yoursite.com/');
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:: FETCH SERVER URL FROM IDENTITY PAGE :: [Note: It is recomended to cache this (Session, Cookie, Database)]
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$openid->GetOpenIDServer(); // Returns false if server is not found
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:: REDIRECT USER TO OPEN ID SERVER FOR APPROVAL ::
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:: (OPTIONAL) SET OPENID SERVER ::
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$openid->SetOpenIDServer($server_url); // If you have cached previously this, you don't have to call GetOpenIDServer and set value this directly
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STEP 2)
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Once user gets returned we must validate signature
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:: VALIDATE REQUEST ::
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true|false = $openid->ValidateWithServer();
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ERRORS:
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array = $openid->GetError(); // Get latest Error code
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FIELDS:
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OpenID allowes you to retreive a profile. To set what fields you'd like to get use (accepts either string or array):
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$openid->SetRequiredFields(array('email','fullname','dob','gender','postcode','country','language','timezone'));
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or
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$openid->SetOptionalFields('postcode');
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IMPORTANT TIPS:
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OPENID as is now, is not trust system. It is a great single-sign on method. If you want to
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store information about OpenID in your database for later use, make sure you handle url identities
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properly.
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For example:
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https://steve.myopenid.com/
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https://steve.myopenid.com
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http://steve.myopenid.com/
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http://steve.myopenid.com
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... are representing one single user. Some OpenIDs can be in format openidserver.com/users/user/ - keep this in mind when storing identities
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To help you store an OpenID in your DB, you can use function:
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$openid_db_safe = $openid->OpenID_Standarize($upenid);
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This may not be comatible with current specs, but it works in current enviroment. Use this function to get openid
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in one format like steve.myopenid.com (without trailing slashes and http/https).
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Use output to insert Identity to database. Don't use this for validation - it may fail.
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*/
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class SimpleOpenID{
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var $openid_url_identity;
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var $URLs = array();
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var $error = array();
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var $fields = array();
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function SimpleOpenID(){
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if (!function_exists('curl_exec')) {
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die('Error: Class SimpleOpenID requires curl extension to work');
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}
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}
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function SetOpenIDServer($a){
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$this->URLs['openid_server'] = $a;
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}
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function SetTrustRoot($a){
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$this->URLs['trust_root'] = $a;
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}
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function SetCancelURL($a){
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$this->URLs['cancel'] = $a;
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}
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function SetApprovedURL($a){
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$this->URLs['approved'] = $a;
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}
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function SetRequiredFields($a){
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if (is_array($a)){
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$this->fields['required'] = $a;
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}else{
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$this->fields['required'][] = $a;
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}
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}
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function SetOptionalFields($a){
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if (is_array($a)){
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$this->fields['optional'] = $a;
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}else{
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$this->fields['optional'][] = $a;
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}
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}
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function SetIdentity($a){ // Set Identity URL
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if(strpos($a, 'http://') === false) {
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$a = 'http://'.$a;
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}
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/*
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$u = parse_url(trim($a));
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if (!isset($u['path'])){
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$u['path'] = '/';
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}else if(substr($u['path'],-1,1) == '/'){
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$u['path'] = substr($u['path'], 0, strlen($u['path'])-1);
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}
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if (isset($u['query'])){ // If there is a query string, then use identity as is
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$identity = $a;
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}else{
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$identity = $u['scheme'] . '://' . $u['host'] . $u['path'];
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}*/
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$this->openid_url_identity = $a;
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}
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function GetIdentity(){ // Get Identity
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return $this->openid_url_identity;
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}
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function GetError(){
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$e = $this->error;
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return array('code'=>$e[0],'description'=>$e[1]);
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}
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function ErrorStore($code, $desc = null){
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$errs['OPENID_NOSERVERSFOUND'] = 'Cannot find OpenID Server TAG on Identity page.';
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if ($desc == null){
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$desc = $errs[$code];
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}
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$this->error = array($code,$desc);
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}
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function IsError(){
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if (count($this->error) > 0){
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return true;
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}else{
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return false;
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}
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}
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function splitResponse($response) {
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$r = array();
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$response = explode("\n", $response);
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foreach($response as $line) {
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$line = trim($line);
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if ($line != "") {
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list($key, $value) = explode(":", $line, 2);
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$r[trim($key)] = trim($value);
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}
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}
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return $r;
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}
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function OpenID_Standarize($openid_identity){
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$u = parse_url(strtolower(trim($openid_identity)));
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if ($u['path'] == '/'){
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$u['path'] = '';
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}
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if(substr($u['path'],-1,1) == '/'){
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$u['path'] = substr($u['path'], 0, strlen($u['path'])-1);
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}
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if (isset($u['query'])){ // If there is a query string, then use identity as is
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return $u['host'] . $u['path'] . '?' . $u['query'];
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}else{
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return $u['host'] . $u['path'];
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}
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}
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function array2url($arr){ // converts associated array to URL Query String
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if (!is_array($arr)){
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return false;
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}
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foreach($arr as $key => $value){
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$query .= $key . "=" . $value . "&";
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}
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return $query;
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}
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function FSOCK_Request($url, $method="GET", $params = ""){
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$fp = fsockopen("ssl://www.myopenid.com", 443, $errno, $errstr, 3); // Connection timeout is 3 seconds
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if (!$fp) {
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$this->ErrorStore('OPENID_SOCKETERROR', $errstr);
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return false;
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} else {
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$request = $method . " /server HTTP/1.0\r\n";
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$request .= "User-Agent: Simple OpenID PHP Class (http://www.phpclasses.org/simple_openid)\r\n";
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$request .= "Connection: close\r\n\r\n";
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fwrite($fp, $request);
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stream_set_timeout($fp, 4); // Connection response timeout is 4 seconds
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$res = fread($fp, 2000);
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$info = stream_get_meta_data($fp);
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fclose($fp);
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if ($info['timed_out']) {
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$this->ErrorStore('OPENID_SOCKETTIMEOUT');
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} else {
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return $res;
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}
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}
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}
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function CURL_Request($url, $method="GET", $params = "") { // Remember, SSL MUST BE SUPPORTED
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if (is_array($params)) $params = $this->array2url($params);
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$curl = curl_init();
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curl_setopt($curl, CURLOPT_URL,$url . ($method == "GET" && $params != "" ? "?" . $params : ""));
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curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
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curl_setopt($curl, CURLOPT_HEADER, false);
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curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
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curl_setopt($curl, CURLOPT_HTTPGET, ($method == "GET"));
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curl_setopt($curl, CURLOPT_POST, ($method == "POST"));
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if ($method == "POST") curl_setopt($curl, CURLOPT_POSTFIELDS, $params);
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curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
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$response = curl_exec($curl);
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if (curl_errno($curl) == 0){
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$response;
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}else{
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$this->ErrorStore('OPENID_CURL', curl_error($curl));
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}
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return $response;
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}
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function HTML2OpenIDServer($content) {
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$get = array();
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// Get details of their OpenID server and (optional) delegate
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preg_match_all('/<link[^>]*rel="openid.server"[^>]*href="([^"]+)"[^>]*\/?>/i', $content, $matches1);
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preg_match_all('/<link[^>]*href="([^"]+)"[^>]*rel="openid.server"[^>]*\/?>/i', $content, $matches2);
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$servers = array_merge($matches1[1], $matches2[1]);
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preg_match_all('/<link[^>]*rel="openid.delegate"[^>]*href="([^"]+)"[^>]*\/?>/i', $content, $matches1);
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preg_match_all('/<link[^>]*href="([^"]+)"[^>]*rel="openid.delegate"[^>]*\/?>/i', $content, $matches2);
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$delegates = array_merge($matches1[1], $matches2[1]);
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$ret = array($servers, $delegates);
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return $ret;
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}
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function GetOpenIDServer(){
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$response = $this->CURL_Request($this->openid_url_identity);
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list($servers, $delegates) = $this->HTML2OpenIDServer($response);
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if (count($servers) == 0){
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$this->ErrorStore('OPENID_NOSERVERSFOUND');
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return false;
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}
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if ($delegates[0] != ""){
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$this->openid_url_identity = $delegates[0];
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}
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$this->SetOpenIDServer($servers[0]);
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return $servers[0];
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}
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function GetRedirectURL(){
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$params = array();
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$params['openid.return_to'] = urlencode($this->URLs['approved']);
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$params['openid.mode'] = 'checkid_setup';
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$params['openid.identity'] = urlencode($this->openid_url_identity);
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$params['openid.trust_root'] = urlencode($this->URLs['trust_root']);
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if (count($this->fields['required']) > 0){
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$params['openid.sreg.required'] = implode(',',$this->fields['required']);
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}
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if (count($this->fields['optional']) > 0){
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$params['openid.sreg.optional'] = implode(',',$this->fields['optional']);
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}
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return $this->URLs['openid_server'] . "?". $this->array2url($params);
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}
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function Redirect(){
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$redirect_to = $this->GetRedirectURL();
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if (headers_sent()){ // Use JavaScript to redirect if content has been previously sent (not recommended, but safe)
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echo '<script language="JavaScript" type="text/javascript">window.location=\'';
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echo $redirect_to;
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echo '\';</script>';
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}else{ // Default Header Redirect
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header('Location: ' . $redirect_to);
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}
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}
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function ValidateWithServer(){
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$params = array(
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'openid.assoc_handle' => urlencode($_GET['openid_assoc_handle']),
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'openid.signed' => urlencode($_GET['openid_signed']),
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'openid.sig' => urlencode($_GET['openid_sig'])
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);
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// Send only required parameters to confirm validity
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$arr_signed = explode(",",str_replace('sreg.','sreg_',$_GET['openid_signed']));
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for ($i=0; $i<count($arr_signed); $i++){
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$s = str_replace('sreg_','sreg.', $arr_signed[$i]);
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$c = $_GET['openid_' . $arr_signed[$i]];
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// if ($c != ""){
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$params['openid.' . $s] = urlencode($c);
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// }
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}
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$params['openid.mode'] = "check_authentication";
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// print "<pre>";
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// print_r($_GET);
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// print_r($params);
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// print "</pre>";
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$openid_server = $this->GetOpenIDServer();
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if ($openid_server == false){
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return false;
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}
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$response = $this->CURL_Request($openid_server,'GET',$params);
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$data = $this->splitResponse($response);
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if ($data['is_valid'] == "true") {
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return true;
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}else{
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return false;
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}
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}
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}
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?>
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