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|
<?php
namespace JsonRPC;
use ReflectionFunction;
use Closure;
/**
* JsonRPC server class
*
* @package JsonRPC
* @author Frderic Guillot
* @license Unlicense http://unlicense.org/
*/
class Server
{
/**
* Data received from the client
*
* @access private
* @var string
*/
private $payload;
/**
* List of procedures
*
* @static
* @access private
* @var array
*/
static private $procedures = array();
/**
* Constructor
*
* @access public
* @param string $payload Client data
*/
public function __construct($payload = '')
{
$this->payload = $payload;
}
/**
* IP based client restrictions
*
* Return an HTTP error 403 if the client is not allowed
*
* @access public
* @param array $hosts List of hosts
*/
public function allowHosts(array $hosts) {
if (! in_array($_SERVER['REMOTE_ADDR'], $hosts)) {
header('Content-Type: application/json');
header('HTTP/1.0 403 Forbidden');
echo '["Access Forbidden"]';
exit;
}
}
/**
* HTTP Basic authentication
*
* Return an HTTP error 401 if the client is not allowed
*
* @access public
* @param array $users Map of username/password
*/
public function authentication(array $users)
{
// OVH workaround
if (isset($_SERVER['REMOTE_USER'])) {
list($_SERVER['PHP_AUTH_USER'], $_SERVER['PHP_AUTH_PW']) = explode(':', base64_decode(substr($_SERVER['REMOTE_USER'], 6)));
}
if (! isset($_SERVER['PHP_AUTH_USER']) ||
! isset($users[$_SERVER['PHP_AUTH_USER']]) ||
$users[$_SERVER['PHP_AUTH_USER']] !== $_SERVER['PHP_AUTH_PW']) {
header('WWW-Authenticate: Basic realm="JsonRPC"');
header('Content-Type: application/json');
header('HTTP/1.0 401 Unauthorized');
echo '["Authentication failed"]';
exit;
}
}
/**
* Register a new procedure
*
* @access public
* @param string $name Procedure name
* @param closure $callback Callback
*/
public function register($name, Closure $callback)
{
self::$procedures[$name] = $callback;
}
/**
* Unregister a procedure
*
* @access public
* @param string $name Procedure name
*/
public function unregister($name)
{
if (isset(self::$procedures[$name])) {
unset(self::$procedures[$name]);
}
}
/**
* Unregister all procedures
*
* @access public
*/
public function unregisterAll()
{
self::$procedures = array();
}
/**
* Return the response to the client
*
* @access public
* @param array $data Data to send to the client
* @param array $payload Incoming data
* @return string
*/
public function getResponse(array $data, array $payload = array())
{
if (! array_key_exists('id', $payload)) {
return '';
}
$response = array(
'jsonrpc' => '2.0',
'id' => $payload['id']
);
$response = array_merge($response, $data);
@header('Content-Type: application/json');
return json_encode($response);
}
/**
* Map arguments to the procedure
*
* @access public
* @param array $request_params Incoming arguments
* @param array $method_params Procedure arguments
* @param array $params Arguments to pass to the callback
* @return bool
*/
public function mapParameters(array $request_params, array $method_params, array &$params)
{
// Positional parameters
if (array_keys($request_params) === range(0, count($request_params) - 1)) {
if (count($request_params) !== count($method_params)) return false;
$params = $request_params;
return true;
}
// Named parameters
foreach ($method_params as $p) {
$name = $p->getName();
if (isset($request_params[$name])) {
$params[$name] = $request_params[$name];
}
else if ($p->isDefaultValueAvailable()) {
$params[$name] = $p->getDefaultValue();
}
else {
return false;
}
}
return true;
}
/**
* Parse incoming requests
*
* @access public
* @return string
*/
public function execute()
{
// Parse payload
if (empty($this->payload)) {
$this->payload = file_get_contents('php://input');
}
if (is_string($this->payload)) {
$this->payload = json_decode($this->payload, true);
}
// Check JSON format
if (! is_array($this->payload)) {
return $this->getResponse(array(
'error' => array(
'code' => -32700,
'message' => 'Parse error'
)),
array('id' => null)
);
}
// Handle batch request
if (array_keys($this->payload) === range(0, count($this->payload) - 1)) {
$responses = array();
foreach ($this->payload as $payload) {
if (! is_array($payload)) {
$responses[] = $this->getResponse(array(
'error' => array(
'code' => -32600,
'message' => 'Invalid Request'
)),
array('id' => null)
);
}
else {
$server = new Server($payload);
$response = $server->execute();
if ($response) $responses[] = $response;
}
}
return empty($responses) ? '' : '['.implode(',', $responses).']';
}
// Check JSON-RPC format
if (! isset($this->payload['jsonrpc']) ||
! isset($this->payload['method']) ||
! is_string($this->payload['method']) ||
$this->payload['jsonrpc'] !== '2.0' ||
(isset($this->payload['params']) && ! is_array($this->payload['params']))) {
return $this->getResponse(array(
'error' => array(
'code' => -32600,
'message' => 'Invalid Request'
)),
array('id' => null)
);
}
// Procedure not found
if (! isset(self::$procedures[$this->payload['method']])) {
return $this->getResponse(array(
'error' => array(
'code' => -32601,
'message' => 'Method not found'
)),
$this->payload
);
}
$callback = self::$procedures[$this->payload['method']];
$params = array();
$reflection = new ReflectionFunction($callback);
if (isset($this->payload['params'])) {
$parameters = $reflection->getParameters();
if (! $this->mapParameters($this->payload['params'], $parameters, $params)) {
return $this->getResponse(array(
'error' => array(
'code' => -32602,
'message' => 'Invalid params'
)),
$this->payload
);
}
}
$result = $reflection->invokeArgs($params);
return $this->getResponse(array('result' => $result), $this->payload);
}
}
|
