Added JSON-RPC API support

app/code/core/Mage/Api/Model/Server/Adapter/Jsonrpc.php

@@ -0,0 +1,110 @@
+<?php
+/**
+ * Magento
+ *
+ * NOTICE OF LICENSE
+ *
+ * This source file is subject to the Open Software License (OSL 3.0)
+ * that is bundled with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://opensource.org/licenses/osl-3.0.php
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@magento.com so we can send you a copy immediately.
+ *
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade Magento to newer
+ * versions in the future. If you wish to customize Magento for your
+ * needs please refer to http://www.magento.com for more information.
+ *
+ * @category    Mage
+ * @package     Mage_Api
+ * @copyright  Copyright (c) 2006-2020 Magento, Inc. (http://www.magento.com)
+ * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
+ */
+
+class Mage_Api_Model_Server_Adapter_Jsonrpc extends Varien_Object implements Mage_Api_Model_Server_Adapter_Interface
+{
+    protected $_jsonRpc = null;
+
+    /**
+     * Set handler class name for webservice
+     *
+     * @param string $handler
+     * @return $this
+     */
+    public function setHandler($handler)
+    {
+        $this->setData('handler', $handler);
+        return $this;
+    }
+
+    /**
+     * Retrieve handler class name for webservice
+     *
+     * @return string
+     */
+    public function getHandler()
+    {
+        return $this->getData('handler');
+    }
+
+    /**
+     * Set webservice api controller
+     *
+     * @param Mage_Api_Controller_Action $controller
+     * @return $this
+     */
+    public function setController(Mage_Api_Controller_Action $controller)
+    {
+        $this->setData('controller', $controller);
+        return $this;
+    }
+
+    /**
+     * Retrieve webservice api controller. If no controller have been set - emulate it by the use of Varien_Object
+     *
+     * @return Mage_Api_Controller_Action|Varien_Object
+     */
+    public function getController()
+    {
+        $controller = $this->getData('controller');
+
+        if (null === $controller) {
+            $controller = new Varien_Object(
+                array('request' => Mage::app()->getRequest(), 'response' => Mage::app()->getResponse())
+            );
+
+            $this->setData('controller', $controller);
+        }
+        return $controller;
+    }
+
+    /**
+     * Run webservice
+     *
+     * @return $this
+     */
+    public function run()
+    {
+        $this->_jsonRpc = new Zend_Json_Server();
+        $this->_jsonRpc->setClass($this->getHandler());
+        $this->getController()->getResponse()
+            ->clearHeaders()
+            ->setHeader('Content-Type', 'application/json; charset=utf8')
+            ->setBody($this->_jsonRpc->handle());
+        return $this;
+    }
+
+    /**
+     * Dispatch webservice fault
+     *
+     * @param int $code
+     * @param string $message
+     */
+    public function fault($code, $message)
+    {
+        throw new Zend_Json_Exception($message, $code);
+    }
+}

app/code/core/Mage/Api/controllers/JsonrpcController.php

@@ -0,0 +1,10 @@
+<?php
+
+class Mage_Api_JsonrpcController extends Mage_Api_Controller_Action
+{
+    public function indexAction()
+    {
+        $this->_getServer()->init($this, 'jsonrpc')
+            ->run();
+    }
+}

app/code/core/Mage/Api/etc/api.xml

@@ -64,6 +64,11 @@
                 <handler>default</handler>
                 <active>1</active>
             </xmlrpc>
+            <jsonrpc>
+                <model>api/server_adapter_jsonrpc</model>
+                <handler>default</handler>
+                <active>1</active>
+            </jsonrpc>
             <default>
                 <use>soap</use>
             </default>