/**
* Constructor will serve any JSON-RPC request received and terminate processing, or return
* control to the page to continue.
* @param Object $object The object whose methods will be made available for JSON RPC calls.
* @param Array $methodMap An optional associative array that can be used to map RPC method
* names to object methods, permitting renaming of methods. This is
* useful for providing PHP reserved words as methods, such as 'echo',
* and can be used for restricting access to methods. If this parameter
* is provided, but a method is not listed in the array, access to the method
* is denied.
* @param Array $config Optional configuration array. Two associative values are supported:
* 'jsonlib' The location of the JSON-PHP library file.
* 'jsolaitlib' The directory off which jsolait has been installed.
*
* @return None If a valid JSON RPC Request has been received, JSONRpcServer will return a response and terminate
* the page. If no such request has been received, JSON RPC will pass control back to the web page, and
* a call to JSONRpcServer::javascript( proxyName ) will insert the appropriate JavaScript proxy code into your
* web page source.
*
*/
function JSONRpcServer($object, $methodMap = null, $config = null)
{
/*
* NOTE: The request object ($request) is parsed into an object, but the response object
* is an associative array. Writing this code, this distinction caused me headaches. Just a
* warning :-)
*/
$this->jsonlib = JSON_PHP_FILE;
$this->jsolaitlib = JSOLAIT_ROOT;
if ($config != null) {
if (array_key_exists("jsonlib", $config)) {
$this->jsonlib = $config["jsonlib"];
}
if (array_key_exists("jsolait", $config)) {
$this->jsolaitlib = $config["jsolait"];
}
}
$json = new PHPJsonWrapper($this->jsonlib);
$additionalMethods = array();
$input = file_get_contents("php://input");
$request = $json->decode($input);
/*
* If we have no request object, we are processing our page, so prepare the js Wrappers
*/
if ($request == null) {
$this->object = $object;
$this->methodMap = $methodMap;
return;
}
$return = array("id" => $request->id, "result" => null, "error" => null);
/* We've got the incoming JSON request object in request - we need to identify the method and the parameters */
$method = $request->method;
/* The methodMap parameter can convert a named method as follows:
* string => string - simply rename the method
* string => anything else - permit access to the method (the actual boolean value does not matter)
*/
if ($methodMap != null) {
if (array_key_exists($method, $methodMap)) {
if (is_string($methodMap[$method])) {
$method = $methodMap[$method];
}
} else {
$return['error'] = "No such method (" . $method . ") permitted on this server.";
return $json->encode($return);
}
}
if (is_object($object)) {
if (!method_exists($object, $method)) {
$return['error'] = "No such method (" . $method . ") exists on this server.";
} else {
/*
* TODO: Try to catch an error in the call: use set_error_handler and restore_error_handler...?
*/
$return['result'] = call_user_func_array(array(&$object, $method), $request->params);
}
} else {
decho("/* object = {$object} */");
if (!function_exists($method)) {
$return['error'] = "No such function (" . $method . ") exists on this server.";
} else {
$return['result'] = call_user_func_array($method, $request->params);
}
}
print $json->encode($return);
exit(0);
}
<?php
/**
* Internal code for the JSONRpcProxy::__call function
* This _extremely_ annoying approach is necessitated to have PHP 4 and PHP 5 compatibility with the same code-base.
* I SINCERELY hope it works!
*/
$json = new PHPJsonWrapper($this->jsonlib);
$postData = array("id" => "remoteRequest", "method" => $method, "params" => $args);
$postData = $json->encode($postData);
/* Make a HTTP Post Request */
$jsonresult = $this->httpWrap->post($this->url, $postData);
/* Some debugging code
echo "<b>JSONRpcProxy::$method received:</b><br/><pre>";
echo str_replace(array("<",">"),array("<>"), $jsonresult);
echo "</pre><hr>";
*/
$result = $json->decode($jsonresult);
if (is_object($result) && $result->id == "remoteRequest") {
$return = array($result->result, $result->error);
} else {
$return = array(null, "JSON-RPC call failed.", $jsonresult);
}