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<?php
/**
* @author Robin J. Rogge <rrogge@bigpoint.net>
* @link http://www.pradosoft.com/
* @copyright 2010 Bigpoint GmbH
* @license http://www.pradosoft.com/license/
* @version $Id$
* @since 3.2
* @package System.Web.Services
*/
/**
* TJsonRpcProtocol class
*
* TJsonRpcProtocol is a class that implements JSON-Rpc protocol in {@link TRpcService}.
* Both version 1.0 and 2.0 of the specification are implemented, and the server will try
* to answer using the same version of the protocol used by the requesting client.
*
* @author Robin J. Rogge <rrogge@bigpoint.net>
* @author Fabio Bas <ctrlaltca@gmail.com>
* @version $Id$
* @package System.Web.Services
* @since 3.2
*/
class TJsonRpcProtocol extends TRpcProtocol
{
protected $_id=null;
protected $_specificationVersion=1.0;
/**
* Handles the RPC request
* @param string $requestPayload
* @return string JSON RPC response
*/
public function callMethod($requestPayload)
{
try
{
$_request = $this->decode($requestPayload);
if(isset($_request['jsonrpc']))
{
$this->_specificationVersion=$_request['jsonrpc'];
if($this->_specificationVersion > 2.0)
throw new TRpcException('Unsupported specification version', '-32600');
}
if(isset($_request['id']))
$this->_id=$_request['id'];
if(!isset($_request['method']))
throw new TRpcException('Missing request method', '-32600');
if(!isset($_request['params']))
$parameters = array();
else
$parameters = $_request['params'];
if(!is_array($parameters))
$parameters = array($parameters);
// a request without an id is a notification that doesn't need a response
if($this->_id !== null)
{
if($this->_specificationVersion==2.0)
{
return $this->encode(array(
'jsonrpc' => '2.0',
'id' => $this->_id,
'result' => $this->callApiMethod($_request['method'], $parameters),
));
} else {
return $this->encode(array(
'id' => $this->_id,
'result' => $this->callApiMethod($_request['method'], $_request['params']),
'error' => null
));
}
}
}
catch(TRpcException $e)
{
return $this->createErrorResponse($e);
}
catch(THttpException $e)
{
throw $e;
}
catch(Exception $e)
{
return $this->createErrorResponse(new TRpcException('An internal error occured', '-32603'));
}
}
/**
* Turns the given exception into an JSON RPC fault
* @param TRpcException $exception
* @return string JSON RPC fault
*/
public function createErrorResponse(TRpcException $exception)
{
if($this->_specificationVersion==2.0)
{
return $this->encode(array(
'id' => $this->_id,
'result' => null,
'error'=> array(
'code' => $exception->getCode(),
'message'=> $exception->getMessage(),
'data' => null,
)
));
} else {
return $this->encode(array(
'id' => $this->_id,
'error'=> array(
'code' => $exception->getCode(),
'message'=> $exception->getMessage(),
'data' => null,
)
));
}
}
/**
* Sets the correct response headers
* @param THttpResponse $response
*/
public function createResponseHeaders($response)
{
$response->setContentType('application/json');
$response->setCharset('UTF-8');
}
/**
* Decodes JSON encoded data into PHP data
* @param string $data in JSON format
* @return array PHP data
*/
public function decode($data)
{
$s = json_decode($data, true);
self::checkJsonError();
return $s;
}
/**
* Encodes PHP data into JSON data
* @param mixed PHP data
* @return string JSON encoded PHP data
*/
public function encode($data)
{
$s = json_encode($data);
self::checkJsonError();
return $s;
}
private static function checkJsonError()
{
$errnum = json_last_error();
if($errnum != JSON_ERROR_NONE)
throw new Exception("JSON error: $msg", $err);
}
/**
* Calls the callback handler for the given method
* Overrides parent implementation to correctly handle error codes
* @param string $methodName of the RPC
* @param array $parameters for the callback handler as provided by the client
* @return mixed whatever the callback handler returns
*/
public function callApiMethod($methodName, $parameters)
{
if(!isset($this->rpcMethods[$methodName]))
throw new TRpcException('Method "'.$methodName.'" not found', '-32601');
return call_user_func_array($this->rpcMethods[$methodName]['method'], $parameters);
}
}
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