524 lines
13 KiB
PHP
524 lines
13 KiB
PHP
<?php
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/**
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* Yadis service manager to be used during yadis-driven authentication
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* attempts.
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*
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* @package OpenID
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*/
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/**
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* The base session class used by the Auth_Yadis_Manager. This
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* class wraps the default PHP session machinery and should be
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* subclassed if your application doesn't use PHP sessioning.
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*
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* @package OpenID
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*/
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class Auth_Yadis_PHPSession {
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/**
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* Set a session key/value pair.
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*
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* @param string $name The name of the session key to add.
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* @param string $value The value to add to the session.
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*/
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function set($name, $value)
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{
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$_SESSION[$name] = $value;
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}
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/**
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* Get a key's value from the session.
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*
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* @param string $name The name of the key to retrieve.
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* @param string $default The optional value to return if the key
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* is not found in the session.
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* @return string $result The key's value in the session or
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* $default if it isn't found.
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*/
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function get($name, $default=null)
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{
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if (isset($_SESSION) && array_key_exists($name, $_SESSION)) {
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return $_SESSION[$name];
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} else {
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return $default;
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}
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}
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/**
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* Remove a key/value pair from the session.
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*
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* @param string $name The name of the key to remove.
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*/
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function del($name)
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{
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unset($_SESSION[$name]);
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}
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/**
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* Return the contents of the session in array form.
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*/
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function contents()
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{
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return $_SESSION;
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}
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}
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/**
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* A session helper class designed to translate between arrays and
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* objects. Note that the class used must have a constructor that
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* takes no parameters. This is not a general solution, but it works
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* for dumb objects that just need to have attributes set. The idea
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* is that you'll subclass this and override $this->check($data) ->
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* bool to implement your own session data validation.
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*
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* @package OpenID
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*/
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class Auth_Yadis_SessionLoader {
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/**
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* Override this.
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*
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* @access private
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*/
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function check($data)
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{
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return true;
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}
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/**
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* Given a session data value (an array), this creates an object
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* (returned by $this->newObject()) whose attributes and values
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* are those in $data. Returns null if $data lacks keys found in
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* $this->requiredKeys(). Returns null if $this->check($data)
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* evaluates to false. Returns null if $this->newObject()
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* evaluates to false.
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*
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* @access private
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*/
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function fromSession($data)
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{
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if (!$data) {
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return null;
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}
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$required = $this->requiredKeys();
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foreach ($required as $k) {
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if (!array_key_exists($k, $data)) {
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return null;
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}
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}
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if (!$this->check($data)) {
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return null;
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}
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$data = array_merge($data, $this->prepareForLoad($data));
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$obj = $this->newObject($data);
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if (!$obj) {
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return null;
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}
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foreach ($required as $k) {
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$obj->$k = $data[$k];
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}
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return $obj;
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}
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/**
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* Prepares the data array by making any necessary changes.
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* Returns an array whose keys and values will be used to update
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* the original data array before calling $this->newObject($data).
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*
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* @access private
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*/
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function prepareForLoad($data)
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{
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return array();
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}
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/**
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* Returns a new instance of this loader's class, using the
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* session data to construct it if necessary. The object need
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* only be created; $this->fromSession() will take care of setting
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* the object's attributes.
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*
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* @access private
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*/
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function newObject($data)
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{
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return null;
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}
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/**
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* Returns an array of keys and values built from the attributes
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* of $obj. If $this->prepareForSave($obj) returns an array, its keys
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* and values are used to update the $data array of attributes
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* from $obj.
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*
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* @access private
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*/
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function toSession($obj)
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{
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$data = array();
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foreach ($obj as $k => $v) {
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$data[$k] = $v;
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}
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$extra = $this->prepareForSave($obj);
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if ($extra && is_array($extra)) {
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foreach ($extra as $k => $v) {
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$data[$k] = $v;
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}
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}
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return $data;
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}
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/**
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* Override this.
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*
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* @access private
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*/
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function prepareForSave($obj)
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{
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return array();
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}
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}
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/**
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* A concrete loader implementation for Auth_OpenID_ServiceEndpoints.
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*
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* @package OpenID
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*/
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class Auth_OpenID_ServiceEndpointLoader extends Auth_Yadis_SessionLoader {
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function newObject($data)
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{
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return new Auth_OpenID_ServiceEndpoint();
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}
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function requiredKeys()
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{
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$obj = new Auth_OpenID_ServiceEndpoint();
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$data = array();
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foreach ($obj as $k => $v) {
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$data[] = $k;
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}
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return $data;
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}
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function check($data)
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{
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return is_array($data['type_uris']);
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}
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}
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/**
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* A concrete loader implementation for Auth_Yadis_Managers.
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*
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* @package OpenID
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*/
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class Auth_Yadis_ManagerLoader extends Auth_Yadis_SessionLoader {
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function requiredKeys()
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{
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return array('starting_url',
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'yadis_url',
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'services',
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'session_key',
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'_current',
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'stale');
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}
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function newObject($data)
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{
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return new Auth_Yadis_Manager($data['starting_url'],
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$data['yadis_url'],
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$data['services'],
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$data['session_key']);
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}
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function check($data)
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{
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return is_array($data['services']);
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}
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function prepareForLoad($data)
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{
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$loader = new Auth_OpenID_ServiceEndpointLoader();
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$services = array();
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foreach ($data['services'] as $s) {
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$services[] = $loader->fromSession($s);
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}
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return array('services' => $services);
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}
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function prepareForSave($obj)
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{
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$loader = new Auth_OpenID_ServiceEndpointLoader();
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$services = array();
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foreach ($obj->services as $s) {
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$services[] = $loader->toSession($s);
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}
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return array('services' => $services);
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}
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}
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/**
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* The Yadis service manager which stores state in a session and
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* iterates over <Service> elements in a Yadis XRDS document and lets
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* a caller attempt to use each one. This is used by the Yadis
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* library internally.
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*
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* @package OpenID
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*/
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class Auth_Yadis_Manager {
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/**
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* Intialize a new yadis service manager.
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*
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* @access private
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*/
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function Auth_Yadis_Manager($starting_url, $yadis_url,
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$services, $session_key)
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{
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// The URL that was used to initiate the Yadis protocol
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$this->starting_url = $starting_url;
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// The URL after following redirects (the identifier)
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$this->yadis_url = $yadis_url;
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// List of service elements
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$this->services = $services;
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$this->session_key = $session_key;
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// Reference to the current service object
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$this->_current = null;
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// Stale flag for cleanup if PHP lib has trouble.
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$this->stale = false;
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}
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/**
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* @access private
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*/
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function length()
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{
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// How many untried services remain?
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return count($this->services);
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}
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/**
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* Return the next service
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*
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* $this->current() will continue to return that service until the
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* next call to this method.
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*/
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function nextService()
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{
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if ($this->services) {
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$this->_current = array_shift($this->services);
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} else {
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$this->_current = null;
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}
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return $this->_current;
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}
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/**
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* @access private
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*/
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function current()
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{
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// Return the current service.
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// Returns None if there are no services left.
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return $this->_current;
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}
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/**
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* @access private
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*/
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function forURL($url)
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{
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return in_array($url, array($this->starting_url, $this->yadis_url));
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}
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/**
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* @access private
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*/
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function started()
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{
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// Has the first service been returned?
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return $this->_current !== null;
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}
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}
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/**
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* State management for discovery.
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*
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* High-level usage pattern is to call .getNextService(discover) in
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* order to find the next available service for this user for this
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* session. Once a request completes, call .cleanup() to clean up the
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* session state.
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*
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* @package OpenID
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*/
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class Auth_Yadis_Discovery {
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/**
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* @access private
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*/
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var $DEFAULT_SUFFIX = 'auth';
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/**
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* @access private
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*/
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var $PREFIX = '_yadis_services_';
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/**
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* Initialize a discovery object.
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*
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* @param Auth_Yadis_PHPSession $session An object which
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* implements the Auth_Yadis_PHPSession API.
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* @param string $url The URL on which to attempt discovery.
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* @param string $session_key_suffix The optional session key
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* suffix override.
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*/
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function Auth_Yadis_Discovery($session, $url,
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$session_key_suffix = null)
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{
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/// Initialize a discovery object
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$this->session = $session;
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$this->url = $url;
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if ($session_key_suffix === null) {
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$session_key_suffix = $this->DEFAULT_SUFFIX;
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}
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$this->session_key_suffix = $session_key_suffix;
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$this->session_key = $this->PREFIX . $this->session_key_suffix;
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}
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/**
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* Return the next authentication service for the pair of
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* user_input and session. This function handles fallback.
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*/
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function getNextService($discover_cb, $fetcher)
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{
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$manager = $this->getManager();
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if (!$manager || (!$manager->services)) {
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$this->destroyManager();
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list($yadis_url, $services) = call_user_func_array($discover_cb,
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array(
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$this->url,
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$fetcher,
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));
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$manager = $this->createManager($services, $yadis_url);
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}
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if ($manager) {
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$loader = new Auth_Yadis_ManagerLoader();
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$service = $manager->nextService();
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$this->session->set($this->session_key,
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serialize($loader->toSession($manager)));
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} else {
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$service = null;
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}
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return $service;
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}
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/**
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* Clean up Yadis-related services in the session and return the
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* most-recently-attempted service from the manager, if one
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* exists.
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*
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* @param $force True if the manager should be deleted regardless
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* of whether it's a manager for $this->url.
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*/
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function cleanup($force=false)
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{
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$manager = $this->getManager($force);
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if ($manager) {
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$service = $manager->current();
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$this->destroyManager($force);
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} else {
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$service = null;
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}
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return $service;
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}
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/**
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* @access private
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*/
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function getSessionKey()
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{
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// Get the session key for this starting URL and suffix
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return $this->PREFIX . $this->session_key_suffix;
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}
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/**
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* @access private
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*
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* @param $force True if the manager should be returned regardless
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* of whether it's a manager for $this->url.
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*/
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function getManager($force=false)
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{
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// Extract the YadisServiceManager for this object's URL and
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// suffix from the session.
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$manager_str = $this->session->get($this->getSessionKey());
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$manager = null;
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if ($manager_str !== null) {
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$loader = new Auth_Yadis_ManagerLoader();
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$manager = $loader->fromSession(unserialize($manager_str));
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}
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if ($manager && ($manager->forURL($this->url) || $force)) {
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return $manager;
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}
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}
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/**
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* @access private
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*/
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function createManager($services, $yadis_url = null)
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{
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$key = $this->getSessionKey();
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if ($this->getManager()) {
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return $this->getManager();
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}
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if ($services) {
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$loader = new Auth_Yadis_ManagerLoader();
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$manager = new Auth_Yadis_Manager($this->url, $yadis_url,
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$services, $key);
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$this->session->set($this->session_key,
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serialize($loader->toSession($manager)));
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return $manager;
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}
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}
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/**
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* @access private
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*
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* @param $force True if the manager should be deleted regardless
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* of whether it's a manager for $this->url.
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*/
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function destroyManager($force=false)
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{
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if ($this->getManager($force) !== null) {
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$key = $this->getSessionKey();
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$this->session->del($key);
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}
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}
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}
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