diff -r 5b37998e522e -r 162c1de6545a web/lib/Zend/Json/Server/Error.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/Zend/Json/Server/Error.php	Fri Mar 11 15:05:35 2011 +0100
@@ -0,0 +1,198 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * 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@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Json
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: Error.php 20096 2010-01-06 02:05:09Z bkarwin $
+ */
+
+/**
+ * @category   Zend
+ * @package    Zend_Json
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_Json_Server_Error
+{
+    const ERROR_PARSE           = -32768;
+    const ERROR_INVALID_REQUEST = -32600;
+    const ERROR_INVALID_METHOD  = -32601;
+    const ERROR_INVALID_PARAMS  = -32602;
+    const ERROR_INTERNAL        = -32603;
+    const ERROR_OTHER           = -32000;
+
+    /**
+     * Allowed error codes
+     * @var array
+     */
+    protected $_allowedCodes = array(
+        self::ERROR_PARSE,
+        self::ERROR_INVALID_REQUEST,
+        self::ERROR_INVALID_METHOD,
+        self::ERROR_INVALID_PARAMS,
+        self::ERROR_INTERNAL,
+        self::ERROR_OTHER,
+    );
+
+    /**
+     * Current code
+     * @var int
+     */
+    protected $_code = -32000;
+
+    /**
+     * Error data
+     * @var mixed
+     */
+    protected $_data;
+
+    /**
+     * Error message
+     * @var string
+     */
+    protected $_message;
+
+    /**
+     * Constructor
+     *
+     * @param  string $message
+     * @param  int $code
+     * @param  mixed $data
+     * @return void
+     */
+    public function __construct($message = null, $code = -32000, $data = null)
+    {
+        $this->setMessage($message)
+             ->setCode($code)
+             ->setData($data);
+    }
+
+    /**
+     * Set error code
+     *
+     * @param  int $code
+     * @return Zend_Json_Server_Error
+     */
+    public function setCode($code)
+    {
+        if (!is_scalar($code)) {
+            return $this;
+        }
+
+        $code = (int) $code;
+        if (in_array($code, $this->_allowedCodes)) {
+            $this->_code = $code;
+        } elseif (in_array($code, range(-32099, -32000))) {
+            $this->_code = $code;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Get error code
+     *
+     * @return int|null
+     */
+    public function getCode()
+    {
+        return $this->_code;
+    }
+
+    /**
+     * Set error message
+     *
+     * @param  string $message
+     * @return Zend_Json_Server_Error
+     */
+    public function setMessage($message)
+    {
+        if (!is_scalar($message)) {
+            return $this;
+        }
+
+        $this->_message = (string) $message;
+        return $this;
+    }
+
+    /**
+     * Get error message
+     *
+     * @return string
+     */
+    public function getMessage()
+    {
+        return $this->_message;
+    }
+
+    /**
+     * Set error data
+     *
+     * @param  mixed $data
+     * @return Zend_Json_Server_Error
+     */
+    public function setData($data)
+    {
+        $this->_data = $data;
+        return $this;
+    }
+
+    /**
+     * Get error data
+     *
+     * @return mixed
+     */
+    public function getData()
+    {
+        return $this->_data;
+    }
+
+    /**
+     * Cast error to array
+     *
+     * @return array
+     */
+    public function toArray()
+    {
+        return array(
+            'code'    => $this->getCode(),
+            'message' => $this->getMessage(),
+            'data'    => $this->getData(),
+        );
+    }
+
+    /**
+     * Cast error to JSON
+     *
+     * @return string
+     */
+    public function toJson()
+    {
+        require_once 'Zend/Json.php';
+        return Zend_Json::encode($this->toArray());
+    }
+
+    /**
+     * Cast to string (JSON)
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->toJson();
+    }
+}
+