discover.php

简介：IceBB是一个强大

    $local_id = null;

    foreach ($permitted_tags as $tag_name) {
        $tags = $service->getElements($tag_name);

        foreach ($tags as $tag) {
            $content = $parser->content($tag);

            if ($local_id === null) {
                $local_id = $content;
            } else if ($local_id != $content) {
                return false;
            }
        }
    }

    return $local_id;
}

function filter_MatchesAnyOpenIDType(&$service)
{
    $uris = $service->getTypes();

    foreach ($uris as $uri) {
        if (in_array($uri, Auth_OpenID_getOpenIDTypeURIs())) {
            return true;
        }
    }

    return false;
}

function Auth_OpenID_bestMatchingService($service, $preferred_types)
{
    // Return the index of the first matching type, or something
    // higher if no type matches.
    //
    // This provides an ordering in which service elements that
    // contain a type that comes earlier in the preferred types list
    // come before service elements that come later. If a service
    // element has more than one type, the most preferred one wins.

    foreach ($preferred_types as $index => $typ) {
        if (in_array($typ, $service->type_uris)) {
            return $index;
        }
    }

    return count($preferred_types);
}

function Auth_OpenID_arrangeByType($service_list, $preferred_types)
{
    // Rearrange service_list in a new list so services are ordered by
    // types listed in preferred_types.  Return the new list.

    // Build a list with the service elements in tuples whose
    // comparison will prefer the one with the best matching service
    $prio_services = array();
    foreach ($service_list as $index => $service) {
        $prio_services[] = array(Auth_OpenID_bestMatchingService($service,
                                                        $preferred_types),
                                 $index, $service);
    }

    sort($prio_services);

    // Now that the services are sorted by priority, remove the sort
    // keys from the list.
    foreach ($prio_services as $index => $s) {
        $prio_services[$index] = $prio_services[$index][2];
    }

    return $prio_services;
}

// Extract OP Identifier services.  If none found, return the rest,
// sorted with most preferred first according to
// OpenIDServiceEndpoint.openid_type_uris.
//
// openid_services is a list of OpenIDServiceEndpoint objects.
//
// Returns a list of OpenIDServiceEndpoint objects."""
function Auth_OpenID_getOPOrUserServices($openid_services)
{
    $op_services = Auth_OpenID_arrangeByType($openid_services,
                                     array(Auth_OpenID_TYPE_2_0_IDP));

    $openid_services = Auth_OpenID_arrangeByType($openid_services,
                                     Auth_OpenID_getOpenIDTypeURIs());

    if ($op_services) {
        return $op_services;
    } else {
        return $openid_services;
    }
}

function Auth_OpenID_makeOpenIDEndpoints($uri, $yadis_services)
{
    $s = array();

    if (!$yadis_services) {
        return $s;
    }

    foreach ($yadis_services as $service) {
        $type_uris = $service->getTypes();
        $uris = $service->getURIs();

        // If any Type URIs match and there is an endpoint URI
        // specified, then this is an OpenID endpoint
        if ($type_uris &&
            $uris) {
            foreach ($uris as $service_uri) {
                $openid_endpoint = new Auth_OpenID_ServiceEndpoint();
                if ($openid_endpoint->parseService($uri,
                                                   $service_uri,
                                                   $type_uris,
                                                   $service)) {
                    $s[] = $openid_endpoint;
                }
            }
        }
    }

    return $s;
}

function Auth_OpenID_discoverWithYadis($uri, &$fetcher,
              $endpoint_filter='Auth_OpenID_getOPOrUserServices',
              $discover_function=null)
{
    // Discover OpenID services for a URI. Tries Yadis and falls back
    // on old-style <link rel='...'> discovery if Yadis fails.

    // Might raise a yadis.discover.DiscoveryFailure if no document
    // came back for that URI at all.  I don't think falling back to
    // OpenID 1.0 discovery on the same URL will help, so don't bother
    // to catch it.
    if ($discover_function === null) {
        $discover_function = array('Auth_Yadis_Yadis', 'discover');
    }

    $openid_services = array();

    $response = call_user_func_array($discover_function,
                                     array($uri, &$fetcher));

    $yadis_url = $response->normalized_uri;
    $yadis_services = array();

    if ($response->isFailure()) {
        return array($uri, array());
    }

    $openid_services = Auth_OpenID_ServiceEndpoint::fromXRDS(
                                         $yadis_url,
                                         $response->response_text);

    if (!$openid_services) {
        if ($response->isXRDS()) {
            return Auth_OpenID_discoverWithoutYadis($uri,
                                                    $fetcher);
        }

        // Try to parse the response as HTML to get OpenID 1.0/1.1
        // <link rel="...">
        $openid_services = Auth_OpenID_ServiceEndpoint::fromHTML(
                                        $yadis_url,
                                        $response->response_text);
    }

    $openid_services = call_user_func_array($endpoint_filter,
                                            array(&$openid_services));

    return array($yadis_url, $openid_services);
}

function Auth_OpenID_discoverURI($uri, &$fetcher)
{
    $parsed = parse_url($uri);

    if ($parsed && isset($parsed['scheme']) &&
        isset($parsed['host'])) {
        if (!in_array($parsed['scheme'], array('http', 'https'))) {
            // raise DiscoveryFailure('URI scheme is not HTTP or HTTPS', None)
            return array($uri, array());
        }
    } else {
        $uri = 'http://' . $uri;
    }

    $uri = Auth_OpenID::normalizeUrl($uri);
    return Auth_OpenID_discoverWithYadis($uri, $fetcher);
}

function Auth_OpenID_discoverWithoutYadis($uri, &$fetcher)
{
    $http_resp = @$fetcher->get($uri);

    if ($http_resp->status != 200) {
        return array($uri, array());
    }

    $identity_url = $http_resp->final_url;

    // Try to parse the response as HTML to get OpenID 1.0/1.1 <link
    // rel="...">
    $openid_services = Auth_OpenID_ServiceEndpoint::fromHTML(
                                           $identity_url,
                                           $http_resp->body);

    return array($identity_url, $openid_services);
}

function Auth_OpenID_discoverXRI($iname, &$fetcher)
{
    $resolver = new Auth_Yadis_ProxyResolver($fetcher);
    list($canonicalID, $yadis_services) =
        $resolver->query($iname,
                         Auth_OpenID_getOpenIDTypeURIs(),
                         array('filter_MatchesAnyOpenIDType'));

    $openid_services = Auth_OpenID_makeOpenIDEndpoints($iname,
                                                       $yadis_services);

    $openid_services = Auth_OpenID_getOPOrUserServices($openid_services);

    for ($i = 0; $i < count($openid_services); $i++) {
        $openid_services[$i]->canonicalID = $canonicalID;
        $openid_services[$i]->claimed_id = $canonicalID;
        $openid_services[$i]->display_identifier = $iname;
    }

    // FIXME: returned xri should probably be in some normal form
    return array($iname, $openid_services);
}

function Auth_OpenID_discover($uri, &$fetcher)
{
    // If the fetcher (i.e., PHP) doesn't support SSL, we can't do
    // discovery on an HTTPS URL.
    if ($fetcher->isHTTPS($uri) && !$fetcher->supportsSSL()) {
        return array($uri, array());
    }

    if (Auth_Yadis_identifierScheme($uri) == 'XRI') {
        $result = Auth_OpenID_discoverXRI($uri, $fetcher);
    } else {
        $result = Auth_OpenID_discoverURI($uri, $fetcher);
    }

    // If the fetcher doesn't support SSL, we can't interact with
    // HTTPS server URLs; remove those endpoints from the list.
    if (!$fetcher->supportsSSL()) {
        $http_endpoints = array();
        list($new_uri, $endpoints) = $result;

        foreach ($endpoints as $e) {
            if (!$fetcher->isHTTPS($e->server_url)) {
                $http_endpoints[] = $e;
            }
        }

        $result = array($new_uri, $http_endpoints);
    }

    return $result;
}

?>