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<?php
require_once(dirname(dirname(__FILE__)) . '/libextinc/OAuth.php');
/**
* OAuth Consumer
*
* @author Andreas Åkre Solberg, <andreas.solberg@uninett.no>, UNINETT AS.
* @package SimpleSAMLphp
*/
class sspmod_oauth_Consumer {
private $consumer;
private $signer;
public function __construct($key, $secret) {
$this->consumer = new OAuthConsumer($key, $secret, NULL);
$this->signer = new OAuthSignatureMethod_HMAC_SHA1();
}
// Used only to load the libextinc library early
public static function dummy() {}
public static function getOAuthError($hrh) {
foreach($hrh AS $h) {
if (preg_match('|OAuth-Error:\s([^;]*)|i', $h, $matches)) {
return $matches[1];
}
}
return null;
}
public static function getContentType($hrh) {
foreach($hrh AS $h) {
if (preg_match('|Content-Type:\s([^;]*)|i', $h, $matches)) {
return $matches[1];
}
}
return null;
}
/*
* This static helper function wraps file_get_contents
* and throws an exception with diagnostics messages if it appear
* to be failing on an OAuth endpoint.
*
* If the status code is not 200, an exception is thrown. If the content-type
* of the response if text/plain, the content of the response is included in
* the text of the Exception thrown.
*/
public static function getHTTP($url, $context = '') {
$response = @file_get_contents($url);
if ($response === FALSE) {
$statuscode = 'unknown';
if (preg_match('/^HTTP.*\s([0-9]{3})/', $http_response_header[0], $matches)) $statuscode = $matches[1];
$error = $context . ' [statuscode: ' . $statuscode . ']: ';
$contenttype = self::getContentType($http_response_header);
$oautherror = self::getOAuthError($http_response_header);
if (!empty($oautherror)) $error .= $oautherror;
throw new Exception($error . ':' . $url);
}
// Fall back to return response, if could not reckognize HTTP header. Should not happen.
return $response;
}
public function getRequestToken($url, $parameters = NULL) {
$req_req = OAuthRequest::from_consumer_and_token($this->consumer, NULL, "GET", $url, $parameters);
$req_req->sign_request($this->signer, $this->consumer, NULL);
$response_req = self::getHTTP($req_req->to_url(),
'Contacting request_token endpoint on the OAuth Provider');
parse_str($response_req, $responseParsed);
if(array_key_exists('error', $responseParsed))
throw new Exception('Error getting request token: ' . $responseParsed['error']);
$requestToken = $responseParsed['oauth_token'];
$requestTokenSecret = $responseParsed['oauth_token_secret'];
return new OAuthToken($requestToken, $requestTokenSecret);
}
public function getAuthorizeRequest($url, $requestToken, $redirect = TRUE, $callback = NULL) {
$params = array('oauth_token' => $requestToken->key);
if ($callback) {
$params['oauth_callback'] = $callback;
}
$authorizeURL = \SimpleSAML\Utils\HTTP::addURLParameters($url, $params);
if ($redirect) {
\SimpleSAML\Utils\HTTP::redirectTrustedURL($authorizeURL);
exit;
}
return $authorizeURL;
}
public function getAccessToken($url, $requestToken, $parameters = NULL) {
$acc_req = OAuthRequest::from_consumer_and_token($this->consumer, $requestToken, "GET", $url, $parameters);
$acc_req->sign_request($this->signer, $this->consumer, $requestToken);
$response_acc = file_get_contents($acc_req->to_url());
if ($response_acc === FALSE) {
throw new Exception('Error contacting request_token endpoint on the OAuth Provider');
}
SimpleSAML\Logger::debug('oauth: Reponse to get access token: '. $response_acc);
parse_str($response_acc, $accessResponseParsed);
if(array_key_exists('error', $accessResponseParsed))
throw new Exception('Error getting request token: ' . $accessResponseParsed['error']);
$accessToken = $accessResponseParsed['oauth_token'];
$accessTokenSecret = $accessResponseParsed['oauth_token_secret'];
return new OAuthToken($accessToken, $accessTokenSecret);
}
public function postRequest($url, $accessToken, $parameters) {
$data_req = OAuthRequest::from_consumer_and_token($this->consumer, $accessToken, "POST", $url, $parameters);
$data_req->sign_request($this->signer, $this->consumer, $accessToken);
$postdata = $data_req->to_postdata();
$opts = array(
'ssl' => array(
'verify_peer' => FALSE,
'capture_peer_cert' => TRUE,
'capture_peer_chain' => TRUE,
),
'http' => array(
'method' => 'POST',
'content' => $postdata,
'header' => 'Content-Type: application/x-www-form-urlencoded',
),
);
$context = stream_context_create($opts);
$response = file_get_contents($url, FALSE, $context);
if ($response === FALSE) {
throw new SimpleSAML_Error_Exception('Failed to push definition file to ' . $url);
}
return $response;
}
public function getUserInfo($url, $accessToken, $opts = NULL) {
$data_req = OAuthRequest::from_consumer_and_token($this->consumer, $accessToken, "GET", $url, NULL);
$data_req->sign_request($this->signer, $this->consumer, $accessToken);
if (is_array($opts)) {
$opts = stream_context_create($opts);
}
$data = file_get_contents($data_req->to_url(), FALSE, $opts);
$dataDecoded = json_decode($data, TRUE);
return $dataDecoded;
}
}
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