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<?php
/**
* Handle the discovery of OAuth service provider endpoints and static consumer identity.
*
* @version $Id$
* @author Marc Worrell <marcw@pobox.com>
* @date Sep 4, 2008 5:05:19 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__).'/discovery/xrds_parse.php';
require_once dirname(__FILE__).'/OAuthException.php';
require_once dirname(__FILE__).'/OAuthRequestLogger.php';
class OAuthDiscovery
{
/**
* Return a description how we can do a consumer allocation. Prefers static allocation if
* possible. If static allocation is possible
*
* See also: http://oauth.net/discovery/#consumer_identity_types
*
* @param string uri
* @return array provider description
*/
static function discover ( $uri )
{
// See what kind of consumer allocations are available
$xrds_file = self::discoverXRDS($uri);
if (!empty($xrds_file))
{
$xrds = xrds_parse($xrds_file);
if (empty($xrds))
{
throw new OAuthException('Could not discover OAuth information for '.$uri);
}
}
else
{
throw new OAuthException('Could not discover XRDS file at '.$uri);
}
// Fill an OAuthServer record for the uri found
$ps = parse_url($uri);
$host = isset($ps['host']) ? $ps['host'] : 'localhost';
$server_uri = $ps['scheme'].'://'.$host.'/';
$p = array(
'user_id' => null,
'consumer_key' => '',
'consumer_secret' => '',
'signature_methods' => '',
'server_uri' => $server_uri,
'request_token_uri' => '',
'authorize_uri' => '',
'access_token_uri' => ''
);
// Consumer identity (out of bounds or static)
if (isset($xrds['consumer_identity']))
{
// Try to find a static consumer allocation, we like those :)
foreach ($xrds['consumer_identity'] as $ci)
{
if ($ci['method'] == 'static' && !empty($ci['consumer_key']))
{
$p['consumer_key'] = $ci['consumer_key'];
$p['consumer_secret'] = '';
}
else if ($ci['method'] == 'oob' && !empty($ci['uri']))
{
// TODO: Keep this uri somewhere for the user?
$p['consumer_oob_uri'] = $ci['uri'];
}
}
}
// The token uris
if (isset($xrds['request'][0]['uri']))
{
$p['request_token_uri'] = $xrds['request'][0]['uri'];
if (!empty($xrds['request'][0]['signature_method']))
{
$p['signature_methods'] = $xrds['request'][0]['signature_method'];
}
}
if (isset($xrds['authorize'][0]['uri']))
{
$p['authorize_uri'] = $xrds['authorize'][0]['uri'];
if (!empty($xrds['authorize'][0]['signature_method']))
{
$p['signature_methods'] = $xrds['authorize'][0]['signature_method'];
}
}
if (isset($xrds['access'][0]['uri']))
{
$p['access_token_uri'] = $xrds['access'][0]['uri'];
if (!empty($xrds['access'][0]['signature_method']))
{
$p['signature_methods'] = $xrds['access'][0]['signature_method'];
}
}
return $p;
}
/**
* Discover the XRDS file at the uri. This is a bit primitive, you should overrule
* this function so that the XRDS file can be cached for later referral.
*
* @param string uri
* @return string false when no XRDS file found
*/
static protected function discoverXRDS ( $uri, $recur = 0 )
{
// Bail out when we are following redirects
if ($recur > 10)
{
return false;
}
$data = self::curl($uri);
// Check what we got back, could be:
// 1. The XRDS discovery file itself (check content-type)
// 2. The X-XRDS-Location header
if (is_string($data) && !empty($data))
{
list($head,$body) = explode("\r\n\r\n", $data);
$body = trim($body);
$m = false;
// See if we got the XRDS file itself or we have to follow a location header
if ( preg_match('/^Content-Type:\s*application\/xrds+xml/im', $head)
|| preg_match('/^<\?xml[^>]*\?>\s*<xrds\s/i', $body)
|| preg_match('/^<xrds\s/i', $body)
)
{
$xrds = $body;
}
else if ( preg_match('/^X-XRDS-Location:\s*(.*)$/im', $head, $m)
|| preg_match('/^Location:\s*(.*)$/im', $head, $m))
{
// Recurse to the given location
if ($uri != $m[1])
{
$xrds = self::discoverXRDS($m[1], $recur+1);
}
else
{
// Referring to the same uri, bail out
$xrds = false;
}
}
else
{
// Not an XRDS file an nowhere else to check
$xrds = false;
}
}
else
{
$xrds = false;
}
return $xrds;
}
/**
* Try to fetch an XRDS file at the given location. Sends an accept header preferring the xrds file.
*
* @param string uri
* @return array (head,body), false on an error
*/
static protected function curl ( $uri )
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Accept: application/xrds+xml, */*;q=0.1'));
curl_setopt($ch, CURLOPT_USERAGENT, 'anyMeta/OAuth 1.0 - (OAuth Discovery $LastChangedRevision: 45 $)');
curl_setopt($ch, CURLOPT_URL, $uri);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
$txt = curl_exec($ch);
curl_close($ch);
// Tell the logger what we requested and what we received back
$data = "GET $uri";
OAuthRequestLogger::setSent($data, "");
OAuthRequestLogger::setReceived($txt);
return $txt;
}
}
/* vi:set ts=4 sts=4 sw=4 binary noeol: */
?>
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