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-##################################
-XML-RPC and XML-RPC Server Classes
-##################################
-
-CodeIgniter's XML-RPC classes permit you to send requests to another
-server, or set up your own XML-RPC server to receive requests.
-
-.. contents::
-  :local:
-
-.. raw:: html
-
-  <div class="custom-index container"></div>
-
-****************
-What is XML-RPC?
-****************
-
-Quite simply it is a way for two computers to communicate over the
-internet using XML. One computer, which we will call the client, sends
-an XML-RPC **request** to another computer, which we will call the
-server. Once the server receives and processes the request it will send
-back a **response** to the client.
-
-For example, using the MetaWeblog API, an XML-RPC Client (usually a
-desktop publishing tool) will send a request to an XML-RPC Server
-running on your site. This request might be a new weblog entry being
-sent for publication, or it could be a request for an existing entry for
-editing. When the XML-RPC Server receives this request it will examine
-it to determine which class/method should be called to process the
-request. Once processed, the server will then send back a response
-message.
-
-For detailed specifications, you can visit the `XML-RPC <http://www.xmlrpc.com/>`_ site.
-
-***********************
-Using the XML-RPC Class
-***********************
-
-Initializing the Class
-======================
-
-Like most other classes in CodeIgniter, the XML-RPC and XML-RPCS classes
-are initialized in your controller using the $this->load->library
-function:
-
-To load the XML-RPC class you will use::
-
-	$this->load->library('xmlrpc');
-
-Once loaded, the xml-rpc library object will be available using:
-$this->xmlrpc
-
-To load the XML-RPC Server class you will use::
-
-	$this->load->library('xmlrpc');
-	$this->load->library('xmlrpcs');
-
-Once loaded, the xml-rpcs library object will be available using:
-$this->xmlrpcs
-
-.. note:: When using the XML-RPC Server class you must load BOTH the
-	XML-RPC class and the XML-RPC Server class.
-
-Sending XML-RPC Requests
-========================
-
-To send a request to an XML-RPC server you must specify the following
-information:
-
--  The URL of the server
--  The method on the server you wish to call
--  The *request* data (explained below).
-
-Here is a basic example that sends a simple Weblogs.com ping to the
-`Ping-o-Matic <http://pingomatic.com/>`_
-
-::
-
-	$this->load->library('xmlrpc');
-
-	$this->xmlrpc->server('http://rpc.pingomatic.com/', 80);
-	$this->xmlrpc->method('weblogUpdates.ping');
-
-	$request = array('My Photoblog', 'http://www.my-site.com/photoblog/');
-	$this->xmlrpc->request($request);
-
-	if ( ! $this->xmlrpc->send_request())
-	{
-		echo $this->xmlrpc->display_error();
-	}
-
-Explanation
------------
-
-The above code initializes the XML-RPC class, sets the server URL and
-method to be called (weblogUpdates.ping). The request (in this case, the
-title and URL of your site) is placed into an array for transportation,
-and compiled using the request() function. Lastly, the full request is
-sent. If the send_request() method returns false we will display the
-error message sent back from the XML-RPC Server.
-
-Anatomy of a Request
-====================
-
-An XML-RPC request is simply the data you are sending to the XML-RPC
-server. Each piece of data in a request is referred to as a request
-parameter. The above example has two parameters: The URL and title of
-your site. When the XML-RPC server receives your request, it will look
-for parameters it requires.
-
-Request parameters must be placed into an array for transportation, and
-each parameter can be one of seven data types (strings, numbers, dates,
-etc.). If your parameters are something other than strings you will have
-to include the data type in the request array.
-
-Here is an example of a simple array with three parameters::
-
-	$request = array('John', 'Doe', 'www.some-site.com');
-	$this->xmlrpc->request($request);
-
-If you use data types other than strings, or if you have several
-different data types, you will place each parameter into its own array,
-with the data type in the second position::
-
-	$request = array(
-		array('John', 'string'),
-		array('Doe', 'string'),
-		array(FALSE, 'boolean'),
-		array(12345, 'int')
-	); 
-	$this->xmlrpc->request($request);
-
-The `Data Types <#datatypes>`_ section below has a full list of data
-types.
-
-Creating an XML-RPC Server
-==========================
-
-An XML-RPC Server acts as a traffic cop of sorts, waiting for incoming
-requests and redirecting them to the appropriate functions for
-processing.
-
-To create your own XML-RPC server involves initializing the XML-RPC
-Server class in your controller where you expect the incoming request to
-appear, then setting up an array with mapping instructions so that
-incoming requests can be sent to the appropriate class and method for
-processing.
-
-Here is an example to illustrate::
-
-	$this->load->library('xmlrpc');
-	$this->load->library('xmlrpcs');
-
-	$config['functions']['new_post'] = array('function' => 'My_blog.new_entry');
-	$config['functions']['update_post'] = array('function' => 'My_blog.update_entry');
-	$config['object'] = $this;
-
-	$this->xmlrpcs->initialize($config);
-	$this->xmlrpcs->serve();
-
-The above example contains an array specifying two method requests that
-the Server allows. The allowed methods are on the left side of the
-array. When either of those are received, they will be mapped to the
-class and method on the right.
-
-The 'object' key is a special key that you pass an instantiated class
-object with, which is necessary when the method you are mapping to is
-not part of the CodeIgniter super object.
-
-In other words, if an XML-RPC Client sends a request for the new_post
-method, your server will load the My_blog class and call the new_entry
-function. If the request is for the update_post method, your server
-will load the My_blog class and call the ``update_entry()`` method.
-
-The function names in the above example are arbitrary. You'll decide
-what they should be called on your server, or if you are using
-standardized APIs, like the Blogger or MetaWeblog API, you'll use their
-function names.
-
-There are two additional configuration keys you may make use of when
-initializing the server class: debug can be set to TRUE in order to
-enable debugging, and xss_clean may be set to FALSE to prevent sending
-data through the Security library's ``xss_clean()`` method.
-
-Processing Server Requests
-==========================
-
-When the XML-RPC Server receives a request and loads the class/method
-for processing, it will pass an object to that method containing the
-data sent by the client.
-
-Using the above example, if the new_post method is requested, the
-server will expect a class to exist with this prototype::
-
-	class My_blog extends CI_Controller {
-
-		public function new_post($request)
-		{
-
-		}
-	}
-
-The $request variable is an object compiled by the Server, which
-contains the data sent by the XML-RPC Client. Using this object you will
-have access to the *request parameters* enabling you to process the
-request. When you are done you will send a Response back to the Client.
-
-Below is a real-world example, using the Blogger API. One of the methods
-in the Blogger API is ``getUserInfo()``. Using this method, an XML-RPC
-Client can send the Server a username and password, in return the Server
-sends back information about that particular user (nickname, user ID,
-email address, etc.). Here is how the processing function might look::
-
-	class My_blog extends CI_Controller {
-
-		public function getUserInfo($request)
-		{
-			$username = 'smitty';
-			$password = 'secretsmittypass';
-
-			$this->load->library('xmlrpc');
-
-			$parameters = $request->output_parameters();
-
-			if ($parameters[1] != $username && $parameters[2] != $password)
-			{
-				return $this->xmlrpc->send_error_message('100', 'Invalid Access');
-			}
-
-			$response = array(
-				array(
-					'nickname'  => array('Smitty', 'string'),
-					'userid'    => array('99', 'string'),
-					'url'       => array('http://yoursite.com', 'string'),
-					'email'     => array('jsmith@yoursite.com', 'string'),
-					'lastname'  => array('Smith', 'string'),
-					'firstname' => array('John', 'string')
-				),
-	                         'struct'
-			);
-
-			return $this->xmlrpc->send_response($response);
-		}
-	}
-
-Notes:
-------
-
-The ``output_parameters()`` method retrieves an indexed array
-corresponding to the request parameters sent by the client. In the above
-example, the output parameters will be the username and password.
-
-If the username and password sent by the client were not valid, and
-error message is returned using ``send_error_message()``.
-
-If the operation was successful, the client will be sent back a response
-array containing the user's info.
-
-Formatting a Response
-=====================
-
-Similar to *Requests*, *Responses* must be formatted as an array.
-However, unlike requests, a response is an array **that contains a
-single item**. This item can be an array with several additional arrays,
-but there can be only one primary array index. In other words, the basic
-prototype is this::
-
-	$response = array('Response data', 'array');
-
-Responses, however, usually contain multiple pieces of information. In
-order to accomplish this we must put the response into its own array so
-that the primary array continues to contain a single piece of data.
-Here's an example showing how this might be accomplished::
-
-	$response = array(
-		array(
-			'first_name' => array('John', 'string'),
-			'last_name' => array('Doe', 'string'),
-			'member_id' => array(123435, 'int'),
-			'todo_list' => array(array('clean house', 'call mom', 'water plants'), 'array'),
-		),
-		'struct'
-	);
-
-Notice that the above array is formatted as a struct. This is the most
-common data type for responses.
-
-As with Requests, a response can be one of the seven data types listed
-in the `Data Types <#datatypes>`_ section.
-
-Sending an Error Response
-=========================
-
-If you need to send the client an error response you will use the
-following::
-
-	return $this->xmlrpc->send_error_message('123', 'Requested data not available');
-
-The first parameter is the error number while the second parameter is
-the error message.
-
-Creating Your Own Client and Server
-===================================
-
-To help you understand everything we've covered thus far, let's create a
-couple controllers that act as XML-RPC Client and Server. You'll use the
-Client to send a request to the Server and receive a response.
-
-The Client
-----------
-
-Using a text editor, create a controller called Xmlrpc_client.php. In
-it, place this code and save it to your application/controllers/
-folder::
-
-	<?php
-
-	class Xmlrpc_client extends CI_Controller {
-
-		public function index()
-		{
-			$this->load->helper('url');
-			$server_url = site_url('xmlrpc_server');
-
-			$this->load->library('xmlrpc');
-
-			$this->xmlrpc->server($server_url, 80);
-			$this->xmlrpc->method('Greetings');
-
-			$request = array('How is it going?');
-			$this->xmlrpc->request($request);
-
-			if ( ! $this->xmlrpc->send_request())
-			{
-				echo $this->xmlrpc->display_error();
-			}
-			else
-			{
-				echo '<pre>';
-				print_r($this->xmlrpc->display_response());
-				echo '</pre>';
-			}
-		}
-	}
-	?>
-
-.. note:: In the above code we are using a "url helper". You can find more
-	information in the :doc:`Helpers Functions <../general/helpers>` page.
-
-The Server
-----------
-
-Using a text editor, create a controller called Xmlrpc_server.php. In
-it, place this code and save it to your application/controllers/
-folder::
-
-	<?php
-
-	class Xmlrpc_server extends CI_Controller {
-
-		public function index()
-		{
-			$this->load->library('xmlrpc');
-			$this->load->library('xmlrpcs');
-
-			$config['functions']['Greetings'] = array('function' => 'Xmlrpc_server.process');
-
-			$this->xmlrpcs->initialize($config);
-			$this->xmlrpcs->serve();
-		}
-
-
-		public function process($request)
-		{
-			$parameters = $request->output_parameters();
-
-			$response = array(
-				array(
-					'you_said'  => $parameters[0],
-					'i_respond' => 'Not bad at all.'
-				),
-				'struct'
-			);
-
-			return $this->xmlrpc->send_response($response);
-		}
-	}
-
-
-Try it!
--------
-
-Now visit the your site using a URL similar to this::
-
-	example.com/index.php/xmlrpc_client/
-
-You should now see the message you sent to the server, and its response
-back to you.
-
-The client you created sends a message ("How's is going?") to the
-server, along with a request for the "Greetings" method. The Server
-receives the request and maps it to the ``process()`` method, where a
-response is sent back.
-
-Using Associative Arrays In a Request Parameter
-===============================================
-
-If you wish to use an associative array in your method parameters you
-will need to use a struct datatype::
-
-	$request = array(
-		array(
-			// Param 0
-			array('name' => 'John'),
-			'struct'
-		),
-		array(
-			// Param 1
-			array(
-				'size' => 'large',
-				'shape'=>'round'
-			),
-			'struct'
-		)
-	);
-
-	$this->xmlrpc->request($request);
-
-You can retrieve the associative array when processing the request in
-the Server.
-
-::
-
-	$parameters = $request->output_parameters();
-	$name = $parameters[0]['name'];
-	$size = $parameters[1]['size'];
-	$shape = $parameters[1]['shape'];
-
-Data Types
-==========
-
-According to the `XML-RPC spec <http://www.xmlrpc.com/spec>`_ there are
-seven types of values that you can send via XML-RPC:
-
--  *int* or *i4*
--  *boolean*
--  *string*
--  *double*
--  *dateTime.iso8601*
--  *base64*
--  *struct* (contains array of values)
--  *array* (contains array of values)
-
-***************
-Class Reference
-***************
-
-.. php:class:: CI_Xmlrpc
-
-	.. php:method:: initialize([$config = array()])
-
-		:param	array	$config: Configuration data
-		:rtype:	void
-
-		Initializes the XML-RPC library. Accepts an associative array containing your settings.
-
-	.. php:method:: server($url[, $port = 80[, $proxy = FALSE[, $proxy_port = 8080]]])
-
-		:param	string	$url: XML-RPC server URL
-		:param	int	$port: Server port
-		:param	string	$proxy: Optional proxy
-		:param	int	$proxy_port: Proxy listening port
-		:rtype:	void
-
-		Sets the URL and port number of the server to which a request is to be sent::
-
-			$this->xmlrpc->server('http://www.sometimes.com/pings.php', 80);
-
-		Basic HTTP authentication is also supported, simply add it to the server URL::
-
-			$this->xmlrpc->server('http://user:pass@localhost/', 80);
-
-	.. php:method:: timeout($seconds = 5)
-
-		:param	int	$seconds: Timeout in seconds
-		:rtype:	void
-
-		Set a time out period (in seconds) after which the request will be canceled::
-
-			$this->xmlrpc->timeout(6);
-
-		This timeout period will be used both for an initial connection to 
-                the remote server, as well as for getting a response from it.
-                Make sure you set the timeout before calling ``send_request()``.
-
-	.. php:method:: method($function)
-
-		:param	string	$function: Method name
-		:rtype:	void
-
-		Sets the method that will be requested from the XML-RPC server::
-
-			$this->xmlrpc->method('method');
-
-		Where method is the name of the method.
-
-	.. php:method:: request($incoming)
-
-		:param	array	$incoming: Request data
-		:rtype:	void
-
-		Takes an array of data and builds request to be sent to XML-RPC server::
-
-			$request = array(array('My Photoblog', 'string'), 'http://www.yoursite.com/photoblog/');
-			$this->xmlrpc->request($request);
-
-	.. php:method:: send_request()
-
-		:returns:	TRUE on success, FALSE on failure
-		:rtype:	bool
-
-		The request sending method. Returns boolean TRUE or FALSE based on success for failure, enabling it to be used conditionally.
-
-	.. method set_debug($flag = TRUE)
-
-		:param	bool	$flag: Debug status flag
-		:rtype:	void
-
-		Enables or disables debugging, which will display a variety of information and error data helpful during development.
-
-	.. php:method:: display_error()
-
-		:returns:	Error message string
-		:rtype:	string
-
-		Returns an error message as a string if your request failed for some reason.
-		::
-
-			echo $this->xmlrpc->display_error();
-
-	.. php:method:: display_response()
-
-		:returns:	Response
-		:rtype:	mixed
-
-		Returns the response from the remote server once request is received. The response will typically be an associative array.
-		::
-
-			$this->xmlrpc->display_response();
-
-	.. php:method:: send_error_message($number, $message)
-
-		:param	int	$number: Error number
-		:param	string	$message: Error message
-		:returns:	XML_RPC_Response instance
-		:rtype:	XML_RPC_Response
-
-		This method lets you send an error message from your server to the client.
-		First parameter is the error number while the second parameter is the error message.
-		::
-
-			return $this->xmlrpc->send_error_message(123, 'Requested data not available');
-
-	.. method send_response($response)
-
-		:param	array	$response: Response data
-		:returns:	XML_RPC_Response instance
-		:rtype:	XML_RPC_Response
-
-		Lets you send the response from your server to the client. An array of valid data values must be sent with this method.
-		::
-
-			$response = array(
-				array(
-					'flerror' => array(FALSE, 'boolean'),
-					'message' => "Thanks for the ping!"
-				),
-				'struct'
-			);
-
-			return $this->xmlrpc->send_response($response);