381 lines
10 KiB
PHP
381 lines
10 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Tom Needham
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* @author Michael Gapczynski
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* @author Bart Visscher
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* @copyright 2012 Tom Needham tom@owncloud.com
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* @copyright 2012 Michael Gapczynski mtgap@owncloud.com
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* @copyright 2012 Bart Visscher bartv@thisnet.nl
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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class OC_API {
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/**
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* API authentication levels
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*/
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const GUEST_AUTH = 0;
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const USER_AUTH = 1;
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const SUBADMIN_AUTH = 2;
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const ADMIN_AUTH = 3;
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/**
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* API Response Codes
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*/
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const RESPOND_UNAUTHORISED = 997;
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const RESPOND_SERVER_ERROR = 996;
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const RESPOND_NOT_FOUND = 998;
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const RESPOND_UNKNOWN_ERROR = 999;
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/**
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* api actions
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*/
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protected static $actions = array();
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private static $logoutRequired = false;
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/**
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* registers an api call
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* @param string $method the http method
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* @param string $url the url to match
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* @param callable $action the function to run
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* @param string $app the id of the app registering the call
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* @param int $authLevel the level of authentication required for the call
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* @param array $defaults
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* @param array $requirements
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*/
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public static function register($method, $url, $action, $app,
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$authLevel = OC_API::USER_AUTH,
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$defaults = array(),
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$requirements = array()) {
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$name = strtolower($method).$url;
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$name = str_replace(array('/', '{', '}'), '_', $name);
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if(!isset(self::$actions[$name])) {
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OC::$server->getRouter()->useCollection('ocs');
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OC::$server->getRouter()->create($name, $url)
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->method($method)
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->defaults($defaults)
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->requirements($requirements)
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->action('OC_API', 'call');
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self::$actions[$name] = array();
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}
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self::$actions[$name][] = array('app' => $app, 'action' => $action, 'authlevel' => $authLevel);
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}
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/**
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* handles an api call
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* @param array $parameters
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*/
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public static function call($parameters) {
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// Prepare the request variables
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if($_SERVER['REQUEST_METHOD'] == 'PUT') {
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parse_str(file_get_contents("php://input"), $parameters['_put']);
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} else if($_SERVER['REQUEST_METHOD'] == 'DELETE') {
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parse_str(file_get_contents("php://input"), $parameters['_delete']);
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}
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$name = $parameters['_route'];
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// Foreach registered action
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$responses = array();
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foreach(self::$actions[$name] as $action) {
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// Check authentication and availability
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if(!self::isAuthorised($action)) {
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$responses[] = array(
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'app' => $action['app'],
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'response' => new OC_OCS_Result(null, OC_API::RESPOND_UNAUTHORISED, 'Unauthorised'),
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'shipped' => OC_App::isShipped($action['app']),
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);
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continue;
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}
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if(!is_callable($action['action'])) {
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$responses[] = array(
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'app' => $action['app'],
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'response' => new OC_OCS_Result(null, OC_API::RESPOND_NOT_FOUND, 'Api method not found'),
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'shipped' => OC_App::isShipped($action['app']),
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);
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continue;
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}
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// Run the action
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$responses[] = array(
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'app' => $action['app'],
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'response' => call_user_func($action['action'], $parameters),
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'shipped' => OC_App::isShipped($action['app']),
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);
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}
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$response = self::mergeResponses($responses);
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$format = self::requestedFormat();
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if (self::$logoutRequired) {
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OC_User::logout();
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}
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self::respond($response, $format);
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}
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/**
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* merge the returned result objects into one response
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* @param array $responses
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*/
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public static function mergeResponses($responses) {
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$response = array();
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// Sort into shipped and thirdparty
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$shipped = array(
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'succeeded' => array(),
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'failed' => array(),
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);
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$thirdparty = array(
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'succeeded' => array(),
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'failed' => array(),
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);
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foreach($responses as $response) {
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if($response['shipped'] || ($response['app'] === 'core')) {
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if($response['response']->succeeded()) {
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$shipped['succeeded'][$response['app']] = $response;
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} else {
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$shipped['failed'][$response['app']] = $response;
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}
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} else {
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if($response['response']->succeeded()) {
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$thirdparty['succeeded'][$response['app']] = $response;
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} else {
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$thirdparty['failed'][$response['app']] = $response;
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}
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}
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}
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// Remove any error responses if there is one shipped response that succeeded
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if(!empty($shipped['failed'])) {
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// Which shipped response do we use if they all failed?
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// They may have failed for different reasons (different status codes)
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// Which reponse code should we return?
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// Maybe any that are not OC_API::RESPOND_SERVER_ERROR
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// Merge failed responses if more than one
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$data = array();
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foreach($shipped['failed'] as $failure) {
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$data = array_merge_recursive($data, $failure['response']->getData());
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}
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$picked = reset($shipped['failed']);
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$code = $picked['response']->getStatusCode();
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$meta = $picked['response']->getMeta();
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$response = new OC_OCS_Result($data, $code, $meta['message']);
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return $response;
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} elseif(!empty($shipped['succeeded'])) {
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$responses = array_merge($shipped['succeeded'], $thirdparty['succeeded']);
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} elseif(!empty($thirdparty['failed'])) {
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// Merge failed responses if more than one
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$data = array();
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foreach($thirdparty['failed'] as $failure) {
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$data = array_merge_recursive($data, $failure['response']->getData());
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}
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$picked = reset($thirdparty['failed']);
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$code = $picked['response']->getStatusCode();
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$meta = $picked['response']->getMeta();
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$response = new OC_OCS_Result($data, $code, $meta['message']);
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return $response;
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} else {
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$responses = $thirdparty['succeeded'];
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}
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// Merge the successful responses
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$data = array();
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foreach($responses as $app => $response) {
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if($response['shipped']) {
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$data = array_merge_recursive($response['response']->getData(), $data);
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} else {
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$data = array_merge_recursive($data, $response['response']->getData());
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}
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$codes[] = array('code' => $response['response']->getStatusCode(),
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'meta' => $response['response']->getMeta());
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}
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// Use any non 100 status codes
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$statusCode = 100;
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$statusMessage = null;
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foreach($codes as $code) {
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if($code['code'] != 100) {
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$statusCode = $code['code'];
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$statusMessage = $code['meta']['message'];
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break;
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}
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}
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$result = new OC_OCS_Result($data, $statusCode, $statusMessage);
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return $result;
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}
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/**
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* authenticate the api call
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* @param array $action the action details as supplied to OC_API::register()
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* @return bool
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*/
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private static function isAuthorised($action) {
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$level = $action['authlevel'];
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switch($level) {
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case OC_API::GUEST_AUTH:
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// Anyone can access
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return true;
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break;
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case OC_API::USER_AUTH:
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// User required
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return self::loginUser();
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break;
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case OC_API::SUBADMIN_AUTH:
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// Check for subadmin
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$user = self::loginUser();
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if(!$user) {
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return false;
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} else {
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$subAdmin = OC_SubAdmin::isSubAdmin($user);
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$admin = OC_User::isAdminUser($user);
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if($subAdmin || $admin) {
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return true;
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} else {
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return false;
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}
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}
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break;
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case OC_API::ADMIN_AUTH:
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// Check for admin
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$user = self::loginUser();
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if(!$user) {
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return false;
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} else {
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return OC_User::isAdminUser($user);
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}
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break;
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default:
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// oops looks like invalid level supplied
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return false;
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break;
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}
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}
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/**
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* http basic auth
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* @return string|false (username, or false on failure)
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*/
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private static function loginUser(){
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// reuse existing login
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$loggedIn = OC_User::isLoggedIn();
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$ocsApiRequest = isset($_SERVER['HTTP_OCS_APIREQUEST']) ? $_SERVER['HTTP_OCS_APIREQUEST'] === 'true' : false;
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if ($loggedIn === true && $ocsApiRequest) {
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// initialize the user's filesystem
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\OC_Util::setUpFS(\OC_User::getUser());
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return OC_User::getUser();
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}
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// basic auth
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$authUser = isset($_SERVER['PHP_AUTH_USER']) ? $_SERVER['PHP_AUTH_USER'] : '';
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$authPw = isset($_SERVER['PHP_AUTH_PW']) ? $_SERVER['PHP_AUTH_PW'] : '';
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$return = OC_User::login($authUser, $authPw);
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if ($return === true) {
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self::$logoutRequired = true;
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// initialize the user's filesystem
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\OC_Util::setUpFS(\OC_User::getUser());
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return $authUser;
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}
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return false;
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}
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/**
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* respond to a call
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* @param OC_OCS_Result $result
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* @param string $format the format xml|json
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*/
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private static function respond($result, $format='xml') {
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// Send 401 headers if unauthorised
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if($result->getStatusCode() === self::RESPOND_UNAUTHORISED) {
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header('WWW-Authenticate: Basic realm="Authorisation Required"');
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header('HTTP/1.0 401 Unauthorized');
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}
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$response = array(
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'ocs' => array(
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'meta' => $result->getMeta(),
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'data' => $result->getData(),
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),
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);
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if ($format == 'json') {
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OC_JSON::encodedPrint($response);
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} else if ($format == 'xml') {
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header('Content-type: text/xml; charset=UTF-8');
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$writer = new XMLWriter();
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$writer->openMemory();
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$writer->setIndent( true );
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$writer->startDocument();
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self::toXML($response, $writer);
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$writer->endDocument();
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echo $writer->outputMemory(true);
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}
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}
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/**
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* @param XMLWriter $writer
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*/
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private static function toXML($array, $writer) {
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foreach($array as $k => $v) {
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if ($k[0] === '@') {
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$writer->writeAttribute(substr($k, 1), $v);
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continue;
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} else if (is_numeric($k)) {
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$k = 'element';
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}
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if(is_array($v)) {
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$writer->startElement($k);
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self::toXML($v, $writer);
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$writer->endElement();
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} else {
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$writer->writeElement($k, $v);
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}
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}
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}
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/**
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* @return string
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*/
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public static function requestedFormat() {
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$formats = array('json', 'xml');
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$format = !empty($_GET['format']) && in_array($_GET['format'], $formats) ? $_GET['format'] : 'xml';
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return $format;
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}
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/**
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* Based on the requested format the response content type is set
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*/
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public static function setContentType() {
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$format = \OC_API::requestedFormat();
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if ($format === 'xml') {
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header('Content-type: text/xml; charset=UTF-8');
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return;
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}
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if ($format === 'json') {
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header('Content-Type: application/json; charset=utf-8');
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return;
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}
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header('Content-Type: application/octet-stream; charset=utf-8');
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}
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}
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