<?php
/*
          COPYRIGHT

Copyright 2007 Sergio Vaccaro <sergio@inservibile.org>
Copyright 2013-2018 FusionDirectory

This file is part of JSON-RPC PHP.

JSON-RPC PHP is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

JSON-RPC PHP 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with JSON-RPC PHP; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

/**
 * This class build a json-RPC Server 1.0
 * http://json-rpc.org/wiki/specification
 *
 * @author sergio <jsonrpcphp@inservibile.org>
 */
class jsonRPCServer
{
  /**
   * This function handle a request binding it to a given object
   *
   * @param object $object
   * @return boolean
   */
  public static function handle ($object)
  {
    // checks if a JSON-RCP request has been received
    if (
      $_SERVER['REQUEST_METHOD'] != 'POST' ||
      empty($_SERVER['CONTENT_TYPE']) ||
      $_SERVER['CONTENT_TYPE'] != 'application/json'
      ) {
      // This is not a JSON-RPC request
      return FALSE;
    }

    // reads the input data
    $request = json_decode(file_get_contents('php://input'), TRUE);

    // executes the task on local object
    try {
      if (($result = @call_user_func_array([$object,$request['method']], $request['params'])) !== FALSE) {
        $response = [
          'id'      => $request['id'],
          'result'  => $result,
          'error'   => NULL
        ];
      } else {
        $response = [
          'id'      => $request['id'],
          'result'  => NULL,
          'error'   => 'unknown method or incorrect parameters'
        ];
      }
    } catch (Exception $e) {
      $response = [
        'id'      => $request['id'],
        'result'  => NULL,
        'error'   => $e->getMessage()
      ];
    }

    // output the response
    // notifications don't want response
    if (!empty($request['id'])) {
      header('content-type: text/javascript');
      $res = json_encode($response);
      if ($res === FALSE) {
        $response = [
          'id'      => $request['id'],
          'result'  => NULL,
          'error'   => 'Failed to encode response: '.json_last_error_msg()
        ];
        echo json_encode($response);
      } else {
        echo $res;
      }
    }

    // finish
    return TRUE;
  }
}
