nextcloud/lib/api.php

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<?php
/**
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* 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/>.
*
*/
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class OC_API {
/**
* API authentication levels
*/
const GUEST_AUTH = 0;
const USER_AUTH = 1;
const SUBADMIN_AUTH = 2;
const ADMIN_AUTH = 3;
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/**
* API Response Codes
*/
const RESPOND_UNAUTHORISED = 997;
const RESPOND_SERVER_ERROR = 996;
const RESPOND_NOT_FOUND = 998;
const RESPOND_UNKNOWN_ERROR = 999;
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/**
* api actions
*/
protected static $actions = array();
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/**
* 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,
$authLevel = OC_API::USER_AUTH,
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$defaults = array(),
$requirements = array()) {
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$name = strtolower($method).$url;
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$name = str_replace(array('/', '{', '}'), '_', $name);
if(!isset(self::$actions[$name])) {
OC::getRouter()->useCollection('ocs');
OC::getRouter()->create($name, $url)
->method($method)
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->action('OC_API', 'call');
self::$actions[$name] = array();
}
self::$actions[$name][] = array('app' => $app, 'action' => $action, 'authlevel' => $authLevel);
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}
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/**
* handles an api call
* @param array $parameters
*/
public static function call($parameters) {
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// Prepare the request variables
if($_SERVER['REQUEST_METHOD'] == 'PUT') {
parse_str(file_get_contents("php://input"), $parameters['_put']);
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} else if($_SERVER['REQUEST_METHOD'] == 'DELETE') {
parse_str(file_get_contents("php://input"), $parameters['_delete']);
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}
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$name = $parameters['_route'];
// Foreach registered action
$responses = array();
foreach(self::$actions[$name] as $action) {
// Check authentication and availability
if(!self::isAuthorised(self::$actions[$name])) {
$responses[] = array(
'app' => $action['app'],
'response' => new OC_OCS_Result(null, OC_API::RESPOND_UNAUTHORISED, 'Unauthorised'),
);
continue;
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}
if(!is_callable($action['action'])) {
$responses[] = array(
'app' => $action['app'],
'response' => new OC_OCS_Result(null, OC_API::RESPOND_NOT_FOUND, 'Api method not found'),
);
continue;
}
// Run the action
$responses[] = array(
'app' => $action['app'],
'response' => call_user_func($action['action'], $parameters),
);
}
$response = self::mergeResponses($responses);
$formats = array('json', 'xml');
$format = !empty($_GET['format']) && in_array($_GET['format'], $formats) ? $_GET['format'] : 'xml';
self::respond($response);
OC_User::logout();
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}
/**
* merge the returned result objects into one response
* @param array $responses
*/
private static function mergeResponses($responses) {
$response = array();
// Sort into shipped and thirdparty
$shipped = array(
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'succeeded' => array(),
'failed' => array(),
);
$thirdparty = array(
'succeeded' => array(),
'failed' => array(),
);
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foreach($responses as $response) {
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if(OC_App::isShipped($response['app']) || ($response['app'] === 'core')) {
if($response['response']->succeeded()) {
$shipped['succeeded'][$response['app']] = $response['response'];
} else {
$shipped['failed'][$response['app']] = $response['response'];
}
} else {
if($response['response']->succeeded()) {
$thirdparty['succeeded'][$response['app']] = $response['response'];
} else {
$thirdparty['failed'][$response['app']] = $response['response'];
}
}
}
// Remove any error responses if there is one shipped response that succeeded
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if(!empty($shipped['succeeded'])) {
$responses = array_merge($shipped['succeeded'], $thirdparty['succeeded']);
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} else if(!empty($shipped['failed'])) {
// Which shipped response do we use if they all failed?
// They may have failed for different reasons (different status codes)
// Which reponse code should we return?
// Maybe any that are not OC_API::RESPOND_SERVER_ERROR
$response = $shipped['failed'][0];
return $response;
} else {
// Return the third party failure result
$response = $thirdparty['failed'][0];
return $response;
}
// Merge the successful responses
$meta = array();
$data = array();
foreach($responses as $app => $response) {
if(OC_App::isShipped($app)) {
$data = array_merge_recursive($response->getData(), $data);
} else {
$data = array_merge_recursive($data, $response->getData());
}
}
$result = new OC_OCS_Result($data, 100);
return $result;
}
/**
* 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);
$admin = OC_User::isAdminUser($user);
if($subAdmin || $admin) {
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;
}
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/**
* respond to a call
* @param OC_OCS_Result $result
* @param string $format the format xml|json
*/
private static function respond($result, $format='xml') {
// Send 401 headers if unauthorised
if($result->getStatusCode() === self::RESPOND_UNAUTHORISED) {
header('WWW-Authenticate: Basic realm="Authorisation Required"');
header('HTTP/1.0 401 Unauthorized');
}
$response = array(
'ocs' => array(
'meta' => $result->getMeta(),
'data' => $result->getData(),
),
);
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if ($format == 'json') {
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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 $writer->outputMemory(true);
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}
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}
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private static function toXML($array, $writer) {
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foreach($array as $k => $v) {
if ($k[0] === '@') {
$writer->writeAttribute(substr($k, 1), $v);
continue;
} else if (is_numeric($k)) {
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$k = 'element';
}
if(is_array($v)) {
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$writer->startElement($k);
self::toXML($v, $writer);
$writer->endElement();
} else {
$writer->writeElement($k, $v);
}
}
}
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}