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<?php
/**
* ownCloud
*
* @author Tom Needham
* @author Michael Gapczynski
* @author Bart Visscher
* @copyright 2012 Tom Needham tom@owncloud.com
* @copyright 2012 Michael Gapczynski mtgap@owncloud.com
* @copyright 2012 Bart Visscher bartv@thisnet.nl
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library 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 library. If not, see <http://www.gnu.org/licenses/>.
*
*/
class OC_API {
/**
* API authentication levels
*/
const GUEST_AUTH = 0;
const USER_AUTH = 1;
const SUBADMIN_AUTH = 2;
const ADMIN_AUTH = 3;
private static $server;
/**
* initialises the OAuth store and server
*/
private static function init() {
self::$server = new OC_OAuth_Server(new OC_OAuth_Store());
}
/**
* api actions
*/
protected static $actions = array();
/**
* registers an api call
* @param string $method the http method
* @param string $url the url to match
* @param callable $action the function to run
* @param string $app the id of the app registering the call
* @param int $authLevel the level of authentication required for the call
* @param array $defaults
* @param array $requirements
*/
public static function register($method, $url, $action, $app,
$authLevel = OC_API::USER_AUTH,
$defaults = array(),
$requirements = array()) {
$name = strtolower($method).$url;
$name = str_replace(array('/', '{', '}'), '_', $name);
if(!isset(self::$actions[$name])) {
OC::getRouter()->useCollection('ocs');
OC::getRouter()->create($name, $url)
->method($method)
->action('OC_API', 'call');
self::$actions[$name] = array();
}
self::$actions[$name] = array('app' => $app, 'action' => $action, 'authlevel' => $authLevel);
}
/**
* handles an api call
* @param array $parameters
*/
public static function call($parameters) {
// Prepare the request variables
if($_SERVER['REQUEST_METHOD'] == 'PUT') {
parse_str(file_get_contents("php://input"), $parameters['_put']);
} else if($_SERVER['REQUEST_METHOD'] == 'DELETE'){
parse_str(file_get_contents("php://input"), $parameters['_delete']);
}
$name = $parameters['_route'];
// Check authentication and availability
if(self::isAuthorised(self::$actions[$name])) {
if(is_callable(self::$actions[$name]['action'])) {
$response = call_user_func(self::$actions[$name]['action'], $parameters);
if(!($response instanceof OC_OCS_Result)) {
$response = new OC_OCS_Result(null, 996, 'Internal Server Error');
}
} else {
$response = new OC_OCS_Result(null, 998, 'Api method not found');
}
} else {
header('WWW-Authenticate: Basic realm="Authorization Required"');
header('HTTP/1.0 401 Unauthorized');
$response = new OC_OCS_Result(null, 997, 'Unauthorised');
}
// Send the response
$formats = array('json', 'xml');
$format = !empty($_GET['format']) && in_array($_GET['format'], $formats) ? $_GET['format'] : 'xml';
self::respond($response, $format);
// logout the user to be stateless
OC_User::logout();
}
/**
* authenticate the api call
* @param array $action the action details as supplied to OC_API::register()
* @return bool
*/
private static function isAuthorised($action) {
$level = $action['authlevel'];
switch($level) {
case OC_API::GUEST_AUTH:
// Anyone can access
return true;
break;
case OC_API::USER_AUTH:
// User required
return self::loginUser();
break;
case OC_API::SUBADMIN_AUTH:
// Check for subadmin
$user = self::loginUser();
if(!$user) {
return false;
} else {
$subAdmin = OC_SubAdmin::isSubAdmin($user);
if($subAdmin) {
return true;
} else {
return false;
}
}
break;
case OC_API::ADMIN_AUTH:
// Check for admin
$user = self::loginUser();
if(!$user) {
return false;
} else {
return OC_User::isAdminUser($user);
}
break;
default:
// oops looks like invalid level supplied
return false;
break;
}
}
/**
* http basic auth
* @return string|false (username, or false on failure)
*/
private static function loginUser(){
$authUser = isset($_SERVER['PHP_AUTH_USER']) ? $_SERVER['PHP_AUTH_USER'] : '';
$authPw = isset($_SERVER['PHP_AUTH_PW']) ? $_SERVER['PHP_AUTH_PW'] : '';
return OC_User::login($authUser, $authPw) ? $authUser : false;
}
/**
* respond to a call
* @param int|array $result the result from the api method
* @param string $format the format xml|json
*/
private static function respond($result, $format='xml') {
$response = array('ocs' => $result->getResult());
if ($format == 'json') {
OC_JSON::encodedPrint($response);
} else if ($format == 'xml') {
header('Content-type: text/xml; charset=UTF-8');
$writer = new XMLWriter();
$writer->openMemory();
$writer->setIndent( true );
$writer->startDocument();
self::toXML($response, $writer);
$writer->endDocument();
echo $writer->outputMemory(true);
}
}
private static function toXML($array, $writer) {
foreach($array as $k => $v) {
if ($k[0] === '@') {
$writer->writeAttribute(substr($k, 1), $v);
continue;
} else if (is_numeric($k)) {
$k = 'element';
}
if(is_array($v)) {
$writer->startElement($k);
self::toXML($v, $writer);
$writer->endElement();
} else {
$writer->writeElement($k, $v);
}
}
}
}
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