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<?php
/**
* Implements the OpenID attribute exchange specification, version 1.0
* as of svn revision 370 from openid.net svn.
*
* @package OpenID
*/
/**
* Require utility classes and functions for the consumer.
*/
require_once "Auth/OpenID/Extension.php";
require_once "Auth/OpenID/Message.php";
require_once "Auth/OpenID/TrustRoot.php";
define('Auth_OpenID_AX_NS_URI',
'http://openid.net/srv/ax/1.0');
// Use this as the 'count' value for an attribute in a FetchRequest to
// ask for as many values as the OP can provide.
define('Auth_OpenID_AX_UNLIMITED_VALUES', 'unlimited');
// Minimum supported alias length in characters. Here for
// completeness.
define('Auth_OpenID_AX_MINIMUM_SUPPORTED_ALIAS_LENGTH', 32);
/**
* AX utility class.
*
* @package OpenID
*/
class Auth_OpenID_AX {
/**
* @param mixed $thing Any object which may be an
* Auth_OpenID_AX_Error object.
*
* @return bool true if $thing is an Auth_OpenID_AX_Error; false
* if not.
*/
static function isError($thing)
{
return is_a($thing, 'Auth_OpenID_AX_Error');
}
}
/**
* Check an alias for invalid characters; raise AXError if any are
* found. Return None if the alias is valid.
*/
function Auth_OpenID_AX_checkAlias($alias)
{
if (strpos($alias, ',') !== false) {
return new Auth_OpenID_AX_Error(sprintf(
"Alias %s must not contain comma", $alias));
}
if (strpos($alias, '.') !== false) {
return new Auth_OpenID_AX_Error(sprintf(
"Alias %s must not contain period", $alias));
}
return true;
}
/**
* Results from data that does not meet the attribute exchange 1.0
* specification
*
* @package OpenID
*/
class Auth_OpenID_AX_Error {
function Auth_OpenID_AX_Error($message=null)
{
$this->message = $message;
}
}
/**
* Abstract class containing common code for attribute exchange
* messages.
*
* @package OpenID
*/
class Auth_OpenID_AX_Message extends Auth_OpenID_Extension {
/**
* ns_alias: The preferred namespace alias for attribute exchange
* messages
*/
var $ns_alias = 'ax';
/**
* mode: The type of this attribute exchange message. This must be
* overridden in subclasses.
*/
var $mode = null;
var $ns_uri = Auth_OpenID_AX_NS_URI;
/**
* Return Auth_OpenID_AX_Error if the mode in the attribute
* exchange arguments does not match what is expected for this
* class; true otherwise.
*
* @access private
*/
function _checkMode($ax_args)
{
$mode = Auth_OpenID::arrayGet($ax_args, 'mode');
if ($mode != $this->mode) {
return new Auth_OpenID_AX_Error(
sprintf(
"Expected mode '%s'; got '%s'",
$this->mode, $mode));
}
return true;
}
/**
* Return a set of attribute exchange arguments containing the
* basic information that must be in every attribute exchange
* message.
*
* @access private
*/
function _newArgs()
{
return array('mode' => $this->mode);
}
}
/**
* Represents a single attribute in an attribute exchange
* request. This should be added to an AXRequest object in order to
* request the attribute.
*
* @package OpenID
*/
class Auth_OpenID_AX_AttrInfo {
/**
* Construct an attribute information object. Do not call this
* directly; call make(...) instead.
*
* @param string $type_uri The type URI for this attribute.
*
* @param int $count The number of values of this type to request.
*
* @param bool $required Whether the attribute will be marked as
* required in the request.
*
* @param string $alias The name that should be given to this
* attribute in the request.
*/
function Auth_OpenID_AX_AttrInfo($type_uri, $count, $required,
$alias)
{
/**
* required: Whether the attribute will be marked as required
* when presented to the subject of the attribute exchange
* request.
*/
$this->required = $required;
/**
* count: How many values of this type to request from the
* subject. Defaults to one.
*/
$this->count = $count;
/**
* type_uri: The identifier that determines what the attribute
* represents and how it is serialized. For example, one type
* URI representing dates could represent a Unix timestamp in
* base 10 and another could represent a human-readable
* string.
*/
$this->type_uri = $type_uri;
/**
* alias: The name that should be given to this attribute in
* the request. If it is not supplied, a generic name will be
* assigned. For example, if you want to call a Unix timestamp
* value 'tstamp', set its alias to that value. If two
* attributes in the same message request to use the same
* alias, the request will fail to be generated.
*/
$this->alias = $alias;
}
/**
* Construct an attribute information object. For parameter
* details, see the constructor.
*/
static function make($type_uri, $count=1, $required=false,
$alias=null)
{
if ($alias !== null) {
$result = Auth_OpenID_AX_checkAlias($alias);
if (Auth_OpenID_AX::isError($result)) {
return $result;
}
}
return new Auth_OpenID_AX_AttrInfo($type_uri, $count, $required,
$alias);
}
/**
* When processing a request for this attribute, the OP should
* call this method to determine whether all available attribute
* values were requested. If self.count == UNLIMITED_VALUES, this
* returns True. Otherwise this returns False, in which case
* self.count is an integer.
*/
function wantsUnlimitedValues()
{
return $this->count === Auth_OpenID_AX_UNLIMITED_VALUES;
}
}
/**
* Given a namespace mapping and a string containing a comma-separated
* list of namespace aliases, return a list of type URIs that
* correspond to those aliases.
*
* @param $namespace_map The mapping from namespace URI to alias
* @param $alias_list_s The string containing the comma-separated
* list of aliases. May also be None for convenience.
*
* @return $seq The list of namespace URIs that corresponds to the
* supplied list of aliases. If the string was zero-length or None, an
* empty list will be returned.
*
* return null If an alias is present in the list of aliases but
* is not present in the namespace map.
*/
function Auth_OpenID_AX_toTypeURIs($namespace_map, $alias_list_s)
{
$uris = array();
if ($alias_list_s) {
foreach (explode(',', $alias_list_s) as $alias) {
$type_uri = $namespace_map->getNamespaceURI($alias);
if ($type_uri === null) {
// raise KeyError(
// 'No type is defined for attribute name %r' % (alias,))
return new Auth_OpenID_AX_Error(
sprintf('No type is defined for attribute name %s',
$alias)
);
} else {
$uris[] = $type_uri;
}
}
}
return $uris;
}
/**
* An attribute exchange 'fetch_request' message. This message is sent
* by a relying party when it wishes to obtain attributes about the
* subject of an OpenID authentication request.
*
* @package OpenID
*/
class Auth_OpenID_AX_FetchRequest extends Auth_OpenID_AX_Message {
var $mode = 'fetch_request';
function Auth_OpenID_AX_FetchRequest($update_url=null)
{
/**
* requested_attributes: The attributes that have been
* requested thus far, indexed by the type URI.
*/
$this->requested_attributes = array();
/**
* update_url: A URL that will accept responses for this
* attribute exchange request, even in the absence of the user
* who made this request.
*/
$this->update_url = $update_url;
}
/**
* Add an attribute to this attribute exchange request.
*
* @param attribute: The attribute that is being requested
* @return true on success, false when the requested attribute is
* already present in this fetch request.
*/
function add($attribute)
{
if ($this->contains($attribute->type_uri)) {
return new Auth_OpenID_AX_Error(
sprintf("The attribute %s has already been requested",
$attribute->type_uri));
}
$this->requested_attributes[$attribute->type_uri] = $attribute;
return true;
}
/**
* Get the serialized form of this attribute fetch request.
*
* @returns Auth_OpenID_AX_FetchRequest The fetch request message parameters
*/
function getExtensionArgs()
{
$aliases = new Auth_OpenID_NamespaceMap();
$required = array();
$if_available = array();
$ax_args = $this->_newArgs();
foreach ($this->requested_attributes as $type_uri => $attribute) {
if ($attribute->alias === null) {
$alias = $aliases->add($type_uri);
} else {
$alias = $aliases->addAlias($type_uri, $attribute->alias);
if ($alias === null) {
return new Auth_OpenID_AX_Error(
sprintf("Could not add alias %s for URI %s",
$attribute->alias, $type_uri
));
}
}
if ($attribute->required) {
$required[] = $alias;
} else {
$if_available[] = $alias;
}
if ($attribute->count != 1) {
$ax_args['count.' . $alias] = strval($attribute->count);
}
$ax_args['type.' . $alias] = $type_uri;
}
if ($required) {
$ax_args['required'] = implode(',', $required);
}
if ($if_available) {
$ax_args['if_available'] = implode(',', $if_available);
}
return $ax_args;
}
/**
* Get the type URIs for all attributes that have been marked as
* required.
*
* @return A list of the type URIs for attributes that have been
* marked as required.
*/
function getRequiredAttrs()
{
$required = array();
foreach ($this->requested_attributes as $type_uri => $attribute) {
if ($attribute->required) {
$required[] = $type_uri;
}
}
return $required;
}
/**
* Extract a FetchRequest from an OpenID message
*
* @param request: The OpenID request containing the attribute
* fetch request
*
* @returns mixed An Auth_OpenID_AX_Error or the
* Auth_OpenID_AX_FetchRequest extracted from the request message if
* successful
*/
static function fromOpenIDRequest($request)
{
$m = $request->message;
$obj = new Auth_OpenID_AX_FetchRequest();
$ax_args = $m->getArgs($obj->ns_uri);
$result = $obj->parseExtensionArgs($ax_args);
if (Auth_OpenID_AX::isError($result)) {
return $result;
}
if ($obj->update_url) {
// Update URL must match the openid.realm of the
// underlying OpenID 2 message.
$realm = $m->getArg(Auth_OpenID_OPENID_NS, 'realm',
$m->getArg(
Auth_OpenID_OPENID_NS,
'return_to'));
if (!$realm) {
$obj = new Auth_OpenID_AX_Error(
sprintf("Cannot validate update_url %s " .
"against absent realm", $obj->update_url));
} else if (!Auth_OpenID_TrustRoot::match($realm,
$obj->update_url)) {
$obj = new Auth_OpenID_AX_Error(
sprintf("Update URL %s failed validation against realm %s",
$obj->update_url, $realm));
}
}
return $obj;
}
/**
* Given attribute exchange arguments, populate this FetchRequest.
*
* @return $result Auth_OpenID_AX_Error if the data to be parsed
* does not follow the attribute exchange specification. At least
* when 'if_available' or 'required' is not specified for a
* particular attribute type. Returns true otherwise.
*/
function parseExtensionArgs($ax_args)
{
$result = $this->_checkMode($ax_args);
if (Auth_OpenID_AX::isError($result)) {
return $result;
}
$aliases = new Auth_OpenID_NamespaceMap();
foreach ($ax_args as $key => $value) {
if (strpos($key, 'type.') === 0) {
$alias = substr($key, 5);
$type_uri = $value;
$alias = $aliases->addAlias($type_uri, $alias);
if ($alias === null) {
return new Auth_OpenID_AX_Error(
sprintf("Could not add alias %s for URI %s",
$alias, $type_uri)
);
}
$count_s = Auth_OpenID::arrayGet($ax_args, 'count.' . $alias);
if ($count_s) {
$count = Auth_OpenID::intval($count_s);
if (($count === false) &&
($count_s === Auth_OpenID_AX_UNLIMITED_VALUES)) {
$count = $count_s;
}
} else {
$count = 1;
}
if ($count === false) {
return new Auth_OpenID_AX_Error(
sprintf("Integer value expected for %s, got %s",
'count.' . $alias, $count_s));
}
$attrinfo = Auth_OpenID_AX_AttrInfo::make($type_uri, $count,
false, $alias);
if (Auth_OpenID_AX::isError($attrinfo)) {
return $attrinfo;
}
$this->add($attrinfo);
}
}
$required = Auth_OpenID_AX_toTypeURIs($aliases,
Auth_OpenID::arrayGet($ax_args, 'required'));
foreach ($required as $type_uri) {
$attrib = $this->requested_attributes[$type_uri];
$attrib->required = true;
}
$if_available = Auth_OpenID_AX_toTypeURIs($aliases,
Auth_OpenID::arrayGet($ax_args, 'if_available'));
$all_type_uris = array_merge($required, $if_available);
foreach ($aliases->iterNamespaceURIs() as $type_uri) {
if (!in_array($type_uri, $all_type_uris)) {
return new Auth_OpenID_AX_Error(
sprintf('Type URI %s was in the request but not ' .
'present in "required" or "if_available"',
$type_uri));
}
}
$this->update_url = Auth_OpenID::arrayGet($ax_args, 'update_url');
return true;
}
/**
* Iterate over the AttrInfo objects that are contained in this
* fetch_request.
*/
function iterAttrs()
{
return array_values($this->requested_attributes);
}
function iterTypes()
{
return array_keys($this->requested_attributes);
}
/**
* Is the given type URI present in this fetch_request?
*/
function contains($type_uri)
{
return in_array($type_uri, $this->iterTypes());
}
}
/**
* An abstract class that implements a message that has attribute keys
* and values. It contains the common code between fetch_response and
* store_request.
*
* @package OpenID
*/
class Auth_OpenID_AX_KeyValueMessage extends Auth_OpenID_AX_Message {
function Auth_OpenID_AX_KeyValueMessage()
{
$this->data = array();
}
/**
* Add a single value for the given attribute type to the
* message. If there are already values specified for this type,
* this value will be sent in addition to the values already
* specified.
*
* @param type_uri: The URI for the attribute
* @param value: The value to add to the response to the relying
* party for this attribute
* @return null
*/
function addValue($type_uri, $value)
{
if (!array_key_exists($type_uri, $this->data)) {
$this->data[$type_uri] = array();
}
$values =& $this->data[$type_uri];
$values[] = $value;
}
/**
* Set the values for the given attribute type. This replaces any
* values that have already been set for this attribute.
*
* @param type_uri: The URI for the attribute
* @param values: A list of values to send for this attribute.
*/
function setValues($type_uri, &$values)
{
$this->data[$type_uri] =& $values;
}
/**
* Get the extension arguments for the key/value pairs contained
* in this message.
*
* @param aliases: An alias mapping. Set to None if you don't care
* about the aliases for this request.
*
* @access private
*/
function _getExtensionKVArgs($aliases)
{
if ($aliases === null) {
$aliases = new Auth_OpenID_NamespaceMap();
}
$ax_args = array();
foreach ($this->data as $type_uri => $values) {
$alias = $aliases->add($type_uri);
$ax_args['type.' . $alias] = $type_uri;
$ax_args['count.' . $alias] = strval(count($values));
foreach ($values as $i => $value) {
$key = sprintf('value.%s.%d', $alias, $i + 1);
$ax_args[$key] = $value;
}
}
return $ax_args;
}
/**
* Parse attribute exchange key/value arguments into this object.
*
* @param ax_args: The attribute exchange fetch_response
* arguments, with namespacing removed.
*
* @return Auth_OpenID_AX_Error or true
*/
function parseExtensionArgs($ax_args)
{
$result = $this->_checkMode($ax_args);
if (Auth_OpenID_AX::isError($result)) {
return $result;
}
$aliases = new Auth_OpenID_NamespaceMap();
foreach ($ax_args as $key => $value) {
if (strpos($key, 'type.') === 0) {
$type_uri = $value;
$alias = substr($key, 5);
$result = Auth_OpenID_AX_checkAlias($alias);
if (Auth_OpenID_AX::isError($result)) {
return $result;
}
$alias = $aliases->addAlias($type_uri, $alias);
if ($alias === null) {
return new Auth_OpenID_AX_Error(
sprintf("Could not add alias %s for URI %s",
$alias, $type_uri)
);
}
}
}
foreach ($aliases->iteritems() as $pair) {
list($type_uri, $alias) = $pair;
if (array_key_exists('count.' . $alias, $ax_args) && ($ax_args['count.' . $alias] !== Auth_OpenID_AX_UNLIMITED_VALUES)) {
$count_key = 'count.' . $alias;
$count_s = $ax_args[$count_key];
$count = Auth_OpenID::intval($count_s);
if ($count === false) {
return new Auth_OpenID_AX_Error(
sprintf("Integer value expected for %s, got %s",
'count. %s' . $alias, $count_s,
Auth_OpenID_AX_UNLIMITED_VALUES)
);
}
$values = array();
for ($i = 1; $i < $count + 1; $i++) {
$value_key = sprintf('value.%s.%d', $alias, $i);
if (!array_key_exists($value_key, $ax_args)) {
return new Auth_OpenID_AX_Error(
sprintf(
"No value found for key %s",
$value_key));
}
$value = $ax_args[$value_key];
$values[] = $value;
}
} else {
$key = 'value.' . $alias;
if (!array_key_exists($key, $ax_args)) {
return new Auth_OpenID_AX_Error(
sprintf(
"No value found for key %s",
$key));
}
$value = $ax_args['value.' . $alias];
if ($value == '') {
$values = array();
} else {
$values = array($value);
}
}
$this->data[$type_uri] = $values;
}
return true;
}
/**
* Get a single value for an attribute. If no value was sent for
* this attribute, use the supplied default. If there is more than
* one value for this attribute, this method will fail.
*
* @param type_uri: The URI for the attribute
* @param default: The value to return if the attribute was not
* sent in the fetch_response.
*
* @return $value Auth_OpenID_AX_Error on failure or the value of
* the attribute in the fetch_response message, or the default
* supplied
*/
function getSingle($type_uri, $default=null)
{
$values = Auth_OpenID::arrayGet($this->data, $type_uri);
if (!$values) {
return $default;
} else if (count($values) == 1) {
return $values[0];
} else {
return new Auth_OpenID_AX_Error(
sprintf('More than one value present for %s',
$type_uri)
);
}
}
/**
* Get the list of values for this attribute in the
* fetch_response.
*
* XXX: what to do if the values are not present? default
* parameter? this is funny because it's always supposed to return
* a list, so the default may break that, though it's provided by
* the user's code, so it might be okay. If no default is
* supplied, should the return be None or []?
*
* @param type_uri: The URI of the attribute
*
* @return $values The list of values for this attribute in the
* response. May be an empty list. If the attribute was not sent
* in the response, returns Auth_OpenID_AX_Error.
*/
function get($type_uri)
{
if (array_key_exists($type_uri, $this->data)) {
return $this->data[$type_uri];
} else {
return new Auth_OpenID_AX_Error(
sprintf("Type URI %s not found in response",
$type_uri)
);
}
}
/**
* Get the number of responses for a particular attribute in this
* fetch_response message.
*
* @param type_uri: The URI of the attribute
*
* @returns int The number of values sent for this attribute. If
* the attribute was not sent in the response, returns
* Auth_OpenID_AX_Error.
*/
function count($type_uri)
{
if (array_key_exists($type_uri, $this->data)) {
return count($this->get($type_uri));
} else {
return new Auth_OpenID_AX_Error(
sprintf("Type URI %s not found in response",
$type_uri)
);
}
}
}
/**
* A fetch_response attribute exchange message.
*
* @package OpenID
*/
class Auth_OpenID_AX_FetchResponse extends Auth_OpenID_AX_KeyValueMessage {
var $mode = 'fetch_response';
function Auth_OpenID_AX_FetchResponse($update_url=null)
{
$this->Auth_OpenID_AX_KeyValueMessage();
$this->update_url = $update_url;
}
/**
* Serialize this object into arguments in the attribute exchange
* namespace
*
* @return $args The dictionary of unqualified attribute exchange
* arguments that represent this fetch_response, or
* Auth_OpenID_AX_Error on error.
*/
function getExtensionArgs($request=null)
{
$aliases = new Auth_OpenID_NamespaceMap();
$zero_value_types = array();
if ($request !== null) {
// Validate the data in the context of the request (the
// same attributes should be present in each, and the
// counts in the response must be no more than the counts
// in the request)
foreach ($this->data as $type_uri => $unused) {
if (!$request->contains($type_uri)) {
return new Auth_OpenID_AX_Error(
sprintf("Response attribute not present in request: %s",
$type_uri)
);
}
}
foreach ($request->iterAttrs() as $attr_info) {
// Copy the aliases from the request so that reading
// the response in light of the request is easier
if ($attr_info->alias === null) {
$aliases->add($attr_info->type_uri);
} else {
$alias = $aliases->addAlias($attr_info->type_uri,
$attr_info->alias);
if ($alias === null) {
return new Auth_OpenID_AX_Error(
sprintf("Could not add alias %s for URI %s",
$attr_info->alias, $attr_info->type_uri)
);
}
}
if (array_key_exists($attr_info->type_uri, $this->data)) {
$values = $this->data[$attr_info->type_uri];
} else {
$values = array();
$zero_value_types[] = $attr_info;
}
if (($attr_info->count != Auth_OpenID_AX_UNLIMITED_VALUES) &&
($attr_info->count < count($values))) {
return new Auth_OpenID_AX_Error(
sprintf("More than the number of requested values " .
"were specified for %s",
$attr_info->type_uri)
);
}
}
}
$kv_args = $this->_getExtensionKVArgs($aliases);
// Add the KV args into the response with the args that are
// unique to the fetch_response
$ax_args = $this->_newArgs();
// For each requested attribute, put its type/alias and count
// into the response even if no data were returned.
foreach ($zero_value_types as $attr_info) {
$alias = $aliases->getAlias($attr_info->type_uri);
$kv_args['type.' . $alias] = $attr_info->type_uri;
$kv_args['count.' . $alias] = '0';
}
$update_url = null;
if ($request) {
$update_url = $request->update_url;
} else {
$update_url = $this->update_url;
}
if ($update_url) {
$ax_args['update_url'] = $update_url;
}
Auth_OpenID::update($ax_args, $kv_args);
return $ax_args;
}
/**
* @return $result Auth_OpenID_AX_Error on failure or true on
* success.
*/
function parseExtensionArgs($ax_args)
{
$result = parent::parseExtensionArgs($ax_args);
if (Auth_OpenID_AX::isError($result)) {
return $result;
}
$this->update_url = Auth_OpenID::arrayGet($ax_args, 'update_url');
return true;
}
/**
* Construct a FetchResponse object from an OpenID library
* SuccessResponse object.
*
* @param success_response: A successful id_res response object
*
* @param signed: Whether non-signed args should be processsed. If
* True (the default), only signed arguments will be processsed.
*
* @return $response A FetchResponse containing the data from the
* OpenID message
*/
static function fromSuccessResponse($success_response, $signed=true)
{
$obj = new Auth_OpenID_AX_FetchResponse();
if ($signed) {
$ax_args = $success_response->getSignedNS($obj->ns_uri);
} else {
$ax_args = $success_response->message->getArgs($obj->ns_uri);
}
if ($ax_args === null || Auth_OpenID::isFailure($ax_args) ||
sizeof($ax_args) == 0) {
return null;
}
$result = $obj->parseExtensionArgs($ax_args);
if (Auth_OpenID_AX::isError($result)) {
#XXX log me
return null;
}
return $obj;
}
}
/**
* A store request attribute exchange message representation.
*
* @package OpenID
*/
class Auth_OpenID_AX_StoreRequest extends Auth_OpenID_AX_KeyValueMessage {
var $mode = 'store_request';
/**
* @param array $aliases The namespace aliases to use when making
* this store response. Leave as None to use defaults.
*/
function getExtensionArgs($aliases=null)
{
$ax_args = $this->_newArgs();
$kv_args = $this->_getExtensionKVArgs($aliases);
Auth_OpenID::update($ax_args, $kv_args);
return $ax_args;
}
}
/**
* An indication that the store request was processed along with this
* OpenID transaction. Use make(), NOT the constructor, to create
* response objects.
*
* @package OpenID
*/
class Auth_OpenID_AX_StoreResponse extends Auth_OpenID_AX_Message {
var $SUCCESS_MODE = 'store_response_success';
var $FAILURE_MODE = 'store_response_failure';
/**
* Returns Auth_OpenID_AX_Error on error or an
* Auth_OpenID_AX_StoreResponse object on success.
*/
function make($succeeded=true, $error_message=null)
{
if (($succeeded) && ($error_message !== null)) {
return new Auth_OpenID_AX_Error('An error message may only be '.
'included in a failing fetch response');
}
return new Auth_OpenID_AX_StoreResponse($succeeded, $error_message);
}
function Auth_OpenID_AX_StoreResponse($succeeded=true, $error_message=null)
{
if ($succeeded) {
$this->mode = $this->SUCCESS_MODE;
} else {
$this->mode = $this->FAILURE_MODE;
}
$this->error_message = $error_message;
}
/**
* Was this response a success response?
*/
function succeeded()
{
return $this->mode == $this->SUCCESS_MODE;
}
function getExtensionArgs()
{
$ax_args = $this->_newArgs();
if ((!$this->succeeded()) && $this->error_message) {
$ax_args['error'] = $this->error_message;
}
return $ax_args;
}
}
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