/**
* Discovers the OpenID server information from the provided URL by parsing
* the HTML page source.
*
* The format of the returned array is (example):
* <code>
* array( 'openid.server' => array( 0 => 'http://www.example-provider.com' ),
* 'openid.delegate' => array( 0 => 'http://www.example-delegate.com' )
* );
* </code>
*
* @throws ezcAuthenticationOpenidConnectionException
* if connection to the URL could not be opened
* @param string $url URL to connect to and discover the OpenID information
* @return array(string=>array)
*/
protected function discoverHtml($url)
{
$url = ezcAuthenticationUrl::normalize($url);
$src = ezcAuthenticationUrl::getUrl($url, 'GET', 'text/html');
$result = array();
$pattern = "%<\\w.*rel\\=[\\s\"'`]*([\\w:?=@&\\/#._;-]+)[\\s\"'`]*[^>]*>%i";
preg_match_all($pattern, $src, $matches);
$count = count($matches[0]);
for ($i = 0; $i < $count; $i++) {
if (stristr($matches[1][$i], 'openid') !== false) {
$pattern = "%.*href\\=[\\s\"'`]*([\\w:?=@&\\/#._;-]+)[\\s\"'`]*%i";
preg_match($pattern, $matches[0][$i], $href);
$result[strtolower($matches[1][$i])][] = $href[1];
}
}
return $result;
}
