forked from GNUsocial/gnu-social
549 lines
17 KiB
PHP
549 lines
17 KiB
PHP
<?php
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/**
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* The OpenID and Yadis discovery implementation for OpenID 1.2.
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*/
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require_once "Auth/OpenID.php";
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require_once "Auth/OpenID/Parse.php";
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require_once "Auth/OpenID/Message.php";
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require_once "Auth/Yadis/XRIRes.php";
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require_once "Auth/Yadis/Yadis.php";
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// XML namespace value
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define('Auth_OpenID_XMLNS_1_0', 'http://openid.net/xmlns/1.0');
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// Yadis service types
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define('Auth_OpenID_TYPE_1_2', 'http://openid.net/signon/1.2');
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define('Auth_OpenID_TYPE_1_1', 'http://openid.net/signon/1.1');
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define('Auth_OpenID_TYPE_1_0', 'http://openid.net/signon/1.0');
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define('Auth_OpenID_TYPE_2_0_IDP', 'http://specs.openid.net/auth/2.0/server');
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define('Auth_OpenID_TYPE_2_0', 'http://specs.openid.net/auth/2.0/signon');
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define('Auth_OpenID_RP_RETURN_TO_URL_TYPE',
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'http://specs.openid.net/auth/2.0/return_to');
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function Auth_OpenID_getOpenIDTypeURIs()
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{
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return array(Auth_OpenID_TYPE_2_0_IDP,
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Auth_OpenID_TYPE_2_0,
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Auth_OpenID_TYPE_1_2,
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Auth_OpenID_TYPE_1_1,
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Auth_OpenID_TYPE_1_0,
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Auth_OpenID_RP_RETURN_TO_URL_TYPE);
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}
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/**
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* Object representing an OpenID service endpoint.
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*/
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class Auth_OpenID_ServiceEndpoint {
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function Auth_OpenID_ServiceEndpoint()
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{
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$this->claimed_id = null;
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$this->server_url = null;
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$this->type_uris = array();
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$this->local_id = null;
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$this->canonicalID = null;
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$this->used_yadis = false; // whether this came from an XRDS
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$this->display_identifier = null;
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}
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function getDisplayIdentifier()
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{
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if ($this->display_identifier) {
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return $this->display_identifier;
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}
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if (! $this->claimed_id) {
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return $this->claimed_id;
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}
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$parsed = parse_url($this->claimed_id);
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$scheme = $parsed['scheme'];
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$host = $parsed['host'];
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$path = $parsed['path'];
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if (array_key_exists('query', $parsed)) {
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$query = $parsed['query'];
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$no_frag = "$scheme://$host$path?$query";
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} else {
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$no_frag = "$scheme://$host$path";
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}
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return $no_frag;
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}
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function usesExtension($extension_uri)
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{
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return in_array($extension_uri, $this->type_uris);
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}
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function preferredNamespace()
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{
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if (in_array(Auth_OpenID_TYPE_2_0_IDP, $this->type_uris) ||
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in_array(Auth_OpenID_TYPE_2_0, $this->type_uris)) {
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return Auth_OpenID_OPENID2_NS;
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} else {
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return Auth_OpenID_OPENID1_NS;
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}
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}
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/*
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* Query this endpoint to see if it has any of the given type
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* URIs. This is useful for implementing other endpoint classes
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* that e.g. need to check for the presence of multiple versions
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* of a single protocol.
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*
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* @param $type_uris The URIs that you wish to check
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*
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* @return all types that are in both in type_uris and
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* $this->type_uris
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*/
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function matchTypes($type_uris)
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{
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$result = array();
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foreach ($type_uris as $test_uri) {
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if ($this->supportsType($test_uri)) {
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$result[] = $test_uri;
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}
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}
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return $result;
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}
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function supportsType($type_uri)
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{
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// Does this endpoint support this type?
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return ((in_array($type_uri, $this->type_uris)) ||
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(($type_uri == Auth_OpenID_TYPE_2_0) &&
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$this->isOPIdentifier()));
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}
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function compatibilityMode()
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{
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return $this->preferredNamespace() != Auth_OpenID_OPENID2_NS;
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}
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function isOPIdentifier()
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{
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return in_array(Auth_OpenID_TYPE_2_0_IDP, $this->type_uris);
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}
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function fromOPEndpointURL($op_endpoint_url)
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{
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// Construct an OP-Identifier OpenIDServiceEndpoint object for
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// a given OP Endpoint URL
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$obj = new Auth_OpenID_ServiceEndpoint();
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$obj->server_url = $op_endpoint_url;
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$obj->type_uris = array(Auth_OpenID_TYPE_2_0_IDP);
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return $obj;
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}
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function parseService($yadis_url, $uri, $type_uris, $service_element)
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{
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// Set the state of this object based on the contents of the
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// service element. Return true if successful, false if not
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// (if findOPLocalIdentifier returns false).
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$this->type_uris = $type_uris;
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$this->server_url = $uri;
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$this->used_yadis = true;
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if (!$this->isOPIdentifier()) {
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$this->claimed_id = $yadis_url;
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$this->local_id = Auth_OpenID_findOPLocalIdentifier(
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$service_element,
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$this->type_uris);
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if ($this->local_id === false) {
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return false;
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}
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}
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return true;
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}
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function getLocalID()
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{
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// Return the identifier that should be sent as the
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// openid.identity_url parameter to the server.
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if ($this->local_id === null && $this->canonicalID === null) {
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return $this->claimed_id;
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} else {
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if ($this->local_id) {
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return $this->local_id;
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} else {
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return $this->canonicalID;
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}
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}
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}
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/*
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* Parse the given document as XRDS looking for OpenID services.
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*
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* @return array of Auth_OpenID_ServiceEndpoint or null if the
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* document cannot be parsed.
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*/
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function fromXRDS($uri, $xrds_text)
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{
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$xrds =& Auth_Yadis_XRDS::parseXRDS($xrds_text);
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if ($xrds) {
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$yadis_services =
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$xrds->services(array('filter_MatchesAnyOpenIDType'));
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return Auth_OpenID_makeOpenIDEndpoints($uri, $yadis_services);
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}
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return null;
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}
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/*
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* Create endpoints from a DiscoveryResult.
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*
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* @param discoveryResult Auth_Yadis_DiscoveryResult
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* @return array of Auth_OpenID_ServiceEndpoint or null if
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* endpoints cannot be created.
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*/
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function fromDiscoveryResult($discoveryResult)
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{
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if ($discoveryResult->isXRDS()) {
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return Auth_OpenID_ServiceEndpoint::fromXRDS(
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$discoveryResult->normalized_uri,
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$discoveryResult->response_text);
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} else {
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return Auth_OpenID_ServiceEndpoint::fromHTML(
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$discoveryResult->normalized_uri,
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$discoveryResult->response_text);
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}
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}
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function fromHTML($uri, $html)
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{
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$discovery_types = array(
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array(Auth_OpenID_TYPE_2_0,
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'openid2.provider', 'openid2.local_id'),
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array(Auth_OpenID_TYPE_1_1,
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'openid.server', 'openid.delegate')
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);
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$services = array();
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foreach ($discovery_types as $triple) {
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list($type_uri, $server_rel, $delegate_rel) = $triple;
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$urls = Auth_OpenID_legacy_discover($html, $server_rel,
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$delegate_rel);
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if ($urls === false) {
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continue;
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}
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list($delegate_url, $server_url) = $urls;
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$service = new Auth_OpenID_ServiceEndpoint();
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$service->claimed_id = $uri;
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$service->local_id = $delegate_url;
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$service->server_url = $server_url;
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$service->type_uris = array($type_uri);
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$services[] = $service;
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}
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return $services;
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}
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function copy()
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{
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$x = new Auth_OpenID_ServiceEndpoint();
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$x->claimed_id = $this->claimed_id;
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$x->server_url = $this->server_url;
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$x->type_uris = $this->type_uris;
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$x->local_id = $this->local_id;
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$x->canonicalID = $this->canonicalID;
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$x->used_yadis = $this->used_yadis;
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return $x;
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}
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}
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function Auth_OpenID_findOPLocalIdentifier($service, $type_uris)
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{
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// Extract a openid:Delegate value from a Yadis Service element.
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// If no delegate is found, returns null. Returns false on
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// discovery failure (when multiple delegate/localID tags have
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// different values).
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$service->parser->registerNamespace('openid',
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Auth_OpenID_XMLNS_1_0);
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$service->parser->registerNamespace('xrd',
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Auth_Yadis_XMLNS_XRD_2_0);
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$parser =& $service->parser;
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$permitted_tags = array();
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if (in_array(Auth_OpenID_TYPE_1_1, $type_uris) ||
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in_array(Auth_OpenID_TYPE_1_0, $type_uris)) {
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$permitted_tags[] = 'openid:Delegate';
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}
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if (in_array(Auth_OpenID_TYPE_2_0, $type_uris)) {
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$permitted_tags[] = 'xrd:LocalID';
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}
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$local_id = null;
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foreach ($permitted_tags as $tag_name) {
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$tags = $service->getElements($tag_name);
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foreach ($tags as $tag) {
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$content = $parser->content($tag);
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if ($local_id === null) {
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$local_id = $content;
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} else if ($local_id != $content) {
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return false;
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}
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}
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}
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return $local_id;
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}
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function filter_MatchesAnyOpenIDType(&$service)
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{
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$uris = $service->getTypes();
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foreach ($uris as $uri) {
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if (in_array($uri, Auth_OpenID_getOpenIDTypeURIs())) {
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return true;
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}
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}
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return false;
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}
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function Auth_OpenID_bestMatchingService($service, $preferred_types)
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{
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// Return the index of the first matching type, or something
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// higher if no type matches.
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//
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// This provides an ordering in which service elements that
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// contain a type that comes earlier in the preferred types list
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// come before service elements that come later. If a service
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// element has more than one type, the most preferred one wins.
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foreach ($preferred_types as $index => $typ) {
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if (in_array($typ, $service->type_uris)) {
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return $index;
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}
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}
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return count($preferred_types);
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}
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function Auth_OpenID_arrangeByType($service_list, $preferred_types)
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{
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// Rearrange service_list in a new list so services are ordered by
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// types listed in preferred_types. Return the new list.
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// Build a list with the service elements in tuples whose
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// comparison will prefer the one with the best matching service
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$prio_services = array();
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foreach ($service_list as $index => $service) {
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$prio_services[] = array(Auth_OpenID_bestMatchingService($service,
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$preferred_types),
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$index, $service);
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}
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sort($prio_services);
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// Now that the services are sorted by priority, remove the sort
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// keys from the list.
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foreach ($prio_services as $index => $s) {
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$prio_services[$index] = $prio_services[$index][2];
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}
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return $prio_services;
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}
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// Extract OP Identifier services. If none found, return the rest,
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// sorted with most preferred first according to
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// OpenIDServiceEndpoint.openid_type_uris.
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//
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// openid_services is a list of OpenIDServiceEndpoint objects.
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//
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// Returns a list of OpenIDServiceEndpoint objects."""
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function Auth_OpenID_getOPOrUserServices($openid_services)
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{
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$op_services = Auth_OpenID_arrangeByType($openid_services,
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array(Auth_OpenID_TYPE_2_0_IDP));
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$openid_services = Auth_OpenID_arrangeByType($openid_services,
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Auth_OpenID_getOpenIDTypeURIs());
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if ($op_services) {
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return $op_services;
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} else {
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return $openid_services;
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}
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}
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function Auth_OpenID_makeOpenIDEndpoints($uri, $yadis_services)
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{
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$s = array();
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if (!$yadis_services) {
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return $s;
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}
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foreach ($yadis_services as $service) {
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$type_uris = $service->getTypes();
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$uris = $service->getURIs();
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// If any Type URIs match and there is an endpoint URI
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// specified, then this is an OpenID endpoint
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if ($type_uris &&
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$uris) {
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foreach ($uris as $service_uri) {
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$openid_endpoint = new Auth_OpenID_ServiceEndpoint();
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if ($openid_endpoint->parseService($uri,
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$service_uri,
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$type_uris,
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$service)) {
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$s[] = $openid_endpoint;
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}
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}
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}
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}
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return $s;
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}
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function Auth_OpenID_discoverWithYadis($uri, &$fetcher,
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$endpoint_filter='Auth_OpenID_getOPOrUserServices',
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$discover_function=null)
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{
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// Discover OpenID services for a URI. Tries Yadis and falls back
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// on old-style <link rel='...'> discovery if Yadis fails.
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// Might raise a yadis.discover.DiscoveryFailure if no document
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// came back for that URI at all. I don't think falling back to
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// OpenID 1.0 discovery on the same URL will help, so don't bother
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// to catch it.
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if ($discover_function === null) {
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$discover_function = array('Auth_Yadis_Yadis', 'discover');
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}
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$openid_services = array();
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$response = call_user_func_array($discover_function,
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array($uri, &$fetcher));
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$yadis_url = $response->normalized_uri;
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$yadis_services = array();
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if ($response->isFailure()) {
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return array($uri, array());
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}
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$openid_services = Auth_OpenID_ServiceEndpoint::fromXRDS(
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$yadis_url,
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$response->response_text);
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if (!$openid_services) {
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if ($response->isXRDS()) {
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return Auth_OpenID_discoverWithoutYadis($uri,
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$fetcher);
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}
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// Try to parse the response as HTML to get OpenID 1.0/1.1
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// <link rel="...">
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$openid_services = Auth_OpenID_ServiceEndpoint::fromHTML(
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$yadis_url,
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$response->response_text);
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}
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$openid_services = call_user_func_array($endpoint_filter,
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array(&$openid_services));
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return array($yadis_url, $openid_services);
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}
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function Auth_OpenID_discoverURI($uri, &$fetcher)
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{
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$uri = Auth_OpenID::normalizeUrl($uri);
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return Auth_OpenID_discoverWithYadis($uri, $fetcher);
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}
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function Auth_OpenID_discoverWithoutYadis($uri, &$fetcher)
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{
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$http_resp = @$fetcher->get($uri);
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if ($http_resp->status != 200 and $http_resp->status != 206) {
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return array($uri, array());
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}
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$identity_url = $http_resp->final_url;
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// Try to parse the response as HTML to get OpenID 1.0/1.1 <link
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// rel="...">
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$openid_services = Auth_OpenID_ServiceEndpoint::fromHTML(
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$identity_url,
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$http_resp->body);
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return array($identity_url, $openid_services);
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}
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function Auth_OpenID_discoverXRI($iname, &$fetcher)
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{
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$resolver = new Auth_Yadis_ProxyResolver($fetcher);
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list($canonicalID, $yadis_services) =
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$resolver->query($iname,
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Auth_OpenID_getOpenIDTypeURIs(),
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array('filter_MatchesAnyOpenIDType'));
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$openid_services = Auth_OpenID_makeOpenIDEndpoints($iname,
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$yadis_services);
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$openid_services = Auth_OpenID_getOPOrUserServices($openid_services);
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for ($i = 0; $i < count($openid_services); $i++) {
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$openid_services[$i]->canonicalID = $canonicalID;
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$openid_services[$i]->claimed_id = $canonicalID;
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$openid_services[$i]->display_identifier = $iname;
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}
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// FIXME: returned xri should probably be in some normal form
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return array($iname, $openid_services);
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}
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function Auth_OpenID_discover($uri, &$fetcher)
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{
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// If the fetcher (i.e., PHP) doesn't support SSL, we can't do
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// discovery on an HTTPS URL.
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if ($fetcher->isHTTPS($uri) && !$fetcher->supportsSSL()) {
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return array($uri, array());
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}
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if (Auth_Yadis_identifierScheme($uri) == 'XRI') {
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$result = Auth_OpenID_discoverXRI($uri, $fetcher);
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} else {
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$result = Auth_OpenID_discoverURI($uri, $fetcher);
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}
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// If the fetcher doesn't support SSL, we can't interact with
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// HTTPS server URLs; remove those endpoints from the list.
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if (!$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;
|
|
}
|
|
|
|
?>
|