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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Superclass for plugins that do authentication and/or authorization
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Plugin
* @package StatusNet
* @author Craig Andrews <candrews@integralblue.com>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET') && !defined('LACONICA')) {
exit(1);
}
/**
* Superclass for plugins that do authentication
*
* @category Plugin
* @package StatusNet
* @author Craig Andrews <candrews@integralblue.com>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
abstract class AuthenticationPlugin extends Plugin
{
//is this plugin authoritative for authentication?
public $authoritative = false;
//should accounts be automatically created after a successful login attempt?
public $autoregistration = false;
//can the user change their email address
public $password_changeable=true;
//unique name for this authentication provider
public $provider_name;
//------------Auth plugin should implement some (or all) of these methods------------\\
/**
* Check if a nickname/password combination is valid
* @param username
* @param password
* @return boolean true if the credentials are valid, false if they are invalid.
*/
function checkPassword($username, $password)
{
return false;
}
/**
* Automatically register a user when they attempt to login with valid credentials.
* User::register($data) is a very useful method for this implementation
* @param username
* @return mixed instance of User, or false (if user couldn't be created)
*/
function autoRegister($username)
{
$registration_data = array();
$registration_data['nickname'] = $username ;
return User::register($registration_data);
}
/**
* Change a user's password
* The old password has been verified to be valid by this plugin before this call is made
* @param username
* @param oldpassword
* @param newpassword
* @return boolean true if the password was changed, false if password changing failed for some reason
*/
function changePassword($username,$oldpassword,$newpassword)
{
return false;
}
//------------Below are the methods that connect StatusNet to the implementing Auth plugin------------\\
function onInitializePlugin(){
if(!isset($this->provider_name)){
throw new Exception("must specify a provider_name for this authentication provider");
}
}
/**
* Internal AutoRegister event handler
* @param nickname
* @param provider_name
* @param user - the newly registered user
*/
function onAutoRegister($nickname, $provider_name, &$user)
{
if($provider_name == $this->provider_name && $this->autoregistration){
$user = $this->autoregister($nickname);
if($user){
User_username::register($user,$nickname,$this->provider_name);
return false;
}
}
}
function onStartCheckPassword($nickname, $password, &$authenticatedUser){
//map the nickname to a username
$user_username = new User_username();
$user_username->username=$nickname;
$user_username->provider_name=$this->provider_name;
if($user_username->find() && $user_username->fetch()){
$username = $user_username->username;
$authenticated = $this->checkPassword($username, $password);
if($authenticated){
$authenticatedUser = User::staticGet('id', $user_username->user_id);
return false;
}
}else{
$user = User::staticGet('nickname', $nickname);
if($user){
//make sure a different provider isn't handling this nickname
$user_username = new User_username();
$user_username->username=$nickname;
if(!$user_username->find()){
//no other provider claims this username, so it's safe for us to handle it
$authenticated = $this->checkPassword($nickname, $password);
if($authenticated){
$authenticatedUser = User::staticGet('nickname', $nickname);
User_username::register($authenticatedUser,$nickname,$this->provider_name);
return false;
}
}
}else{
$authenticated = $this->checkPassword($nickname, $password);
if($authenticated){
if(Event::handle('AutoRegister', array($nickname, $this->provider_name, &$authenticatedUser))){
if($authenticatedUser){
return false;
}
}
}
}
}
if($this->authoritative){
return false;
}else{
//we're not authoritative, so let other handlers try
return;
}
}
function onStartChangePassword($user,$oldpassword,$newpassword)
{
if($this->password_changeable){
$user_username = new User_username();
$user_username->user_id=$user->id;
$user_username->provider_name=$this->provider_name;
if($user_username->find() && $user_username->fetch()){
$authenticated = $this->checkPassword($user_username->username, $oldpassword);
if($authenticated){
$result = $this->changePassword($user_username->username,$oldpassword,$newpassword);
if($result){
//stop handling of other handlers, because what was requested was done
return false;
}else{
throw new Exception(_('Password changing failed'));
}
}else{
if($this->authoritative){
//since we're authoritative, no other plugin could do this
throw new Exception(_('Password changing failed'));
}else{
//let another handler try
return null;
}
}
}
}else{
if($this->authoritative){
//since we're authoritative, no other plugin could do this
throw new Exception(_('Password changing is not allowed'));
}
}
}
function onStartAccountSettingsPasswordMenuItem($widget)
{
if($this->authoritative && !$this->password_changeable){
//since we're authoritative, no other plugin could change passwords, so do not render the menu item
return false;
}
}
function onAutoload($cls)
{
switch ($cls)
{
case 'User_username':
require_once(INSTALLDIR.'/plugins/Authentication/User_username.php');
return false;
default:
return true;
}
}
function onCheckSchema() {
$schema = Schema::get();
$schema->ensureTable('user_username',
array(new ColumnDef('provider_name', 'varchar',
'255', false, 'PRI'),
new ColumnDef('username', 'varchar',
'255', false, 'PRI'),
new ColumnDef('user_id', 'integer',
null, false),
new ColumnDef('created', 'datetime',
null, false),
new ColumnDef('modified', 'timestamp')));
return true;
}
function onUserDeleteRelated($user, &$tables)
{
$tables[] = 'User_username';
return true;
}
}
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