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<?php
/**
* Verify the current request. Checks if signed and if the signature is correct.
* When correct then also figures out on behalf of which user this request is being made.
*
* @version $Id: OAuthRequestVerifier.php 51 2008-10-15 15:15:47Z marcw@pobox.com $
* @author Marc Worrell <marcw@pobox.com>
* @date Nov 16, 2007 4:35:03 PM
*
*
* The MIT License
*
* Copyright (c) 2007-2008 Mediamatic Lab
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
require_once dirname(__FILE__) . '/OAuthStore.php';
require_once dirname(__FILE__) . '/OAuthRequest.php';
class OAuthRequestVerifier extends OAuthRequest
{
private $request;
private $store;
/**
* Construct the request to be verified
*
* @param string request
* @param string method
*/
function __construct ( $uri = null, $method = 'GET' )
{
$this->store = elggconnect_get_oauth_store();//OAuthStore::instance();
parent::__construct($uri, $method);
OAuthRequestLogger::start($this);
}
/**
* See if the current request is signed with OAuth
*
* @return boolean
*/
static public function requestIsSigned ()
{
if (isset($_REQUEST['oauth_signature']))
{
$signed = true;
}
else
{
$hs = getallheaders();
if (isset($hs['Authorization']) && strpos($hs['Authorization'], 'oauth_signature') !== false)
{
$signed = true;
}
else
{
$signed = false;
}
}
return $signed;
}
/**
* Verify the request if it seemed to be signed.
*
* @param string token_type the kind of token needed, defaults to 'access'
* @exception OAuthException thrown when the request did not verify
* @return boolean true when signed, false when not signed
*/
public function verifyIfSigned ( $token_type = 'access' )
{
if ($this->getParam('oauth_consumer_key'))
{
OAuthRequestLogger::start($this);
$this->verify($token_type);
$signed = true;
OAuthRequestLogger::flush();
}
else
{
$signed = false;
}
return $signed;
}
/**
* Verify the request
*
* @param string token_type the kind of token needed, defaults to 'access' (false, 'access', 'request')
* @exception OAuthException thrown when the request did not verify
* @return int user_id associated with token (false when no user associated)
*/
public function verify ( $token_type = 'access' )
{
$consumer_key = $this->getParam('oauth_consumer_key');
$token = $this->getParam('oauth_token');
$user_id = false;
if ($consumer_key && ($token_type === false || $token))
{
$secrets = $this->store->getSecretsForVerify( $this->urldecode($consumer_key),
$this->urldecode($token),
$token_type);
$this->store->checkServerNonce( $this->urldecode($consumer_key),
$this->urldecode($token),
$this->getParam('oauth_timestamp', true),
$this->getParam('oauth_nonce', true));
$oauth_sig = $this->getParam('oauth_signature');
if (empty($oauth_sig))
{
throw new OAuthException('Verification of signature failed (no oauth_signature in request).');
}
try
{
$this->verifySignature($secrets['consumer_secret'], $secrets['token_secret'], $token_type);
}
catch (OAuthException $e)
{
throw new OAuthException('Verification of signature failed (signature base string was "'.$this->signatureBaseString().'").');
}
// Check the optional body signature
if ($this->getParam('xoauth_body_signature'))
{
$method = $this->getParam('xoauth_body_signature_method');
if (empty($method))
{
$method = $this->getParam('oauth_signature_method');
}
try
{
$this->verifyDataSignature($this->getBody(), $secrets['consumer_secret'], $secrets['token_secret'], $method, $this->getParam('xoauth_body_signature'));
}
catch (OAuthException $e)
{
throw new OAuthException('Verification of body signature failed.');
}
}
// All ok - fetch the user associated with this request
if (isset($secrets['user_id']))
{
$user_id = $secrets['user_id'];
}
// Check if the consumer wants us to reset the ttl of this token
$ttl = $this->getParam('xoauth_token_ttl', true);
if (is_numeric($ttl))
{
$this->store->setConsumerAccessTokenTtl($this->urldecode($token), $ttl);
}
}
else
{
throw new OAuthException('Can\'t verify request, missing oauth_consumer_key or oauth_token');
}
return $user_id;
}
/**
* Verify the signature of the request, using the method in oauth_signature_method.
* The signature is returned encoded in the form as used in the url. So the base64 and
* urlencoding has been done.
*
* @param string consumer_secret
* @param string token_secret
* @exception OAuthException thrown when the signature method is unknown
* @exception OAuthException when not all parts available
* @exception OAuthException when signature does not match
*/
public function verifySignature ( $consumer_secret, $token_secret, $token_type = 'access' )
{
$required = array(
'oauth_consumer_key',
'oauth_signature_method',
'oauth_timestamp',
'oauth_nonce',
'oauth_signature'
);
if ($token_type !== false)
{
$required[] = 'oauth_token';
}
foreach ($required as $req)
{
if (!isset($this->param[$req]))
{
throw new OAuthException('Can\'t verify request signature, missing parameter "'.$req.'"');
}
}
$this->checks();
$base = $this->signatureBaseString();
$this->verifyDataSignature($base, $consumer_secret, $token_secret, $this->param['oauth_signature_method'], $this->param['oauth_signature']);
}
/**
* Verify the signature of a string.
*
* @param string data
* @param string consumer_secret
* @param string token_secret
* @param string signature_method
* @param string signature
* @exception OAuthException thrown when the signature method is unknown
* @exception OAuthException when signature does not match
*/
public function verifyDataSignature ( $data, $consumer_secret, $token_secret, $signature_method, $signature )
{
if (is_null($data))
{
$data = '';
}
$sig = $this->getSignatureMethod($signature_method);
if (!$sig->verify($this, $data, $consumer_secret, $token_secret, $signature))
{
throw new OAuthException('Signature verification failed ('.$signature_method.')');
}
}
}
/* vi:set ts=4 sts=4 sw=4 binary noeol: */
?>
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