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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Base class for API actions that require authentication
*
* 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 API
* @package StatusNet
* @author Adrian Lang <mail@adrianlang.de>
* @author Brenda Wallace <shiny@cpan.org>
* @author Craig Andrews <candrews@integralblue.com>
* @author Dan Moore <dan@moore.cx>
* @author Evan Prodromou <evan@status.net>
* @author mEDI <medi@milaro.net>
* @author Sarven Capadisli <csarven@status.net>
* @author Zach Copley <zach@status.net>
* @copyright 2009 StatusNet, Inc.
* @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')) {
exit(1);
}
require_once INSTALLDIR . '/lib/api.php';
/**
* Actions extending this class will require auth
*
* @category API
* @package StatusNet
* @author Zach Copley <zach@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class ApiAuthAction extends ApiAction
{
/**
* Take arguments for running, and output basic auth header if needed
*
* @param array $args $_REQUEST args
*
* @return boolean success flag
*
*/
function prepare($args)
{
parent::prepare($args);
if ($this->requiresAuth()) {
$this->checkBasicAuthUser();
}
return true;
}
/**
* Does this API resource require authentication?
*
* @return boolean true
*/
function requiresAuth()
{
return true;
}
/**
* Check for a user specified via HTTP basic auth. If there isn't
* one, try to get one by outputting the basic auth header.
*
* @return boolean true or false
*/
function checkBasicAuthUser()
{
$this->basicAuthProcessHeader();
$realm = common_config('site', 'name') . ' API';
if (!isset($this->auth_user)) {
header('WWW-Authenticate: Basic realm="' . $realm . '"');
// show error if the user clicks 'cancel'
$this->showBasicAuthError();
exit;
} else {
$nickname = $this->auth_user;
$password = $this->auth_pw;
$user = common_check_user($nickname, $password);
if (Event::handle('StartSetApiUser', array(&$user))) {
$this->auth_user = $user;
Event::handle('EndSetApiUser', array($user));
}
if (empty($this->auth_user)) {
// basic authentication failed
list($proxy, $ip) = common_client_ip();
common_log(
LOG_WARNING,
'Failed API auth attempt, nickname = ' .
"$nickname, proxy = $proxy, ip = $ip."
);
$this->showBasicAuthError();
exit;
}
}
return true;
}
/**
* Read the HTTP headers and set the auth user. Decodes HTTP_AUTHORIZATION
* param to support basic auth when PHP is running in CGI mode.
*
* @return void
*/
function basicAuthProcessHeader()
{
if (isset($_SERVER['AUTHORIZATION'])
|| isset($_SERVER['HTTP_AUTHORIZATION'])
) {
$authorization_header = isset($_SERVER['HTTP_AUTHORIZATION'])
? $_SERVER['HTTP_AUTHORIZATION'] : $_SERVER['AUTHORIZATION'];
}
if (isset($_SERVER['PHP_AUTH_USER'])) {
$this->auth_user = $_SERVER['PHP_AUTH_USER'];
$this->auth_pw = $_SERVER['PHP_AUTH_PW'];
} elseif (isset($authorization_header)
&& strstr(substr($authorization_header, 0, 5), 'Basic')) {
// decode the HTTP_AUTHORIZATION header on php-cgi server self
// on fcgid server the header name is AUTHORIZATION
$auth_hash = base64_decode(substr($authorization_header, 6));
list($this->auth_user, $this->auth_pw) = explode(':', $auth_hash);
// set all to null on a empty basic auth request
if ($this->auth_user == "") {
$this->auth_user = null;
$this->auth_pw = null;
}
} else {
$this->auth_user = null;
$this->auth_pw = null;
}
}
/**
* Output an authentication error message. Use XML or JSON if one
* of those formats is specified, otherwise output plain text
*
* @return void
*/
function showBasicAuthError()
{
header('HTTP/1.1 401 Unauthorized');
$msg = 'Could not authenticate you.';
if ($this->format == 'xml') {
header('Content-Type: application/xml; charset=utf-8');
$this->startXML();
$this->elementStart('hash');
$this->element('error', null, $msg);
$this->element('request', null, $_SERVER['REQUEST_URI']);
$this->elementEnd('hash');
$this->endXML();
} elseif ($this->format == 'json') {
header('Content-Type: application/json; charset=utf-8');
$error_array = array('error' => $msg,
'request' => $_SERVER['REQUEST_URI']);
print(json_encode($error_array));
} else {
header('Content-type: text/plain');
print "$msg\n";
}
}
}
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