diff options
| author | Derek Allard <derek.allard@ellislab.com> | 2008-11-13 23:59:24 +0100 |
|---|---|---|
| committer | Derek Allard <derek.allard@ellislab.com> | 2008-11-13 23:59:24 +0100 |
| commit | 2067d1a727e7eb5e5ffb40e967f3d1fc4c8a41b2 (patch) | |
| tree | a95e01024205837e9580757350d04b233e82503f /user_guide/libraries/xmlrpc.html | |
| parent | dd9f932556d3cd45a1d06cc478f40d06b7649a69 (diff) | |
Changing EOL style to LF
Diffstat (limited to 'user_guide/libraries/xmlrpc.html')
| -rw-r--r-- | user_guide/libraries/xmlrpc.html | 1032 |
1 files changed, 516 insertions, 516 deletions
diff --git a/user_guide/libraries/xmlrpc.html b/user_guide/libraries/xmlrpc.html index 9c1b7145f..e329e4a95 100644 --- a/user_guide/libraries/xmlrpc.html +++ b/user_guide/libraries/xmlrpc.html @@ -1,517 +1,517 @@ -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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-
-
-<h1>XML-RPC and XML-RPC Server Classes</h1>
-
-
-<p>CodeIgniter's XML-RPC classes permit you to send requests to another server, or set up
-your own XML-RPC server to receive requests.</p>
-
-
-<h2>What is XML-RPC?</h2>
-
-<p>Quite simply it is a way for two computers to communicate over the internet using XML.
-One computer, which we will call the <dfn>client</dfn>, sends an XML-RPC <strong>request</strong> to
-another computer, which we will call the <dfn>server</dfn>. Once the server receives and processes the request it
-will send back a <strong>response</strong> to the client.</p>
-
-<p>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.</p>
-
-<p>For detailed specifications, you can visit the <a href="http://www.xmlrpc.com/">XML-RPC</a> site.</p>
-
-<h2>Initializing the Class</h2>
-
-<p>Like most other classes in CodeIgniter, the XML-RPC and XML-RPCS classes are initialized in your controller using the <dfn>$this->load->library</dfn> function:</p>
-
-<p>To load the XML-RPC class you will use:</p>
-<code>$this->load->library('xmlrpc');</code>
-<p>Once loaded, the xml-rpc library object will be available using: <dfn>$this->xmlrpc</dfn></p>
-
-<p>To load the XML-RPC Server class you will use:</p>
-<code>
-$this->load->library('xmlrpc');<br />
-$this->load->library('xmlrpcs');
-</code>
-<p>Once loaded, the xml-rpcs library object will be available using: <dfn>$this->xmlrpcs</dfn></p>
-
-<p class="important"><strong>Note:</strong> When using the XML-RPC Server class you must load BOTH the XML-RPC class and the XML-RPC Server class.</p>
-
-
-
-<h2>Sending XML-RPC Requests</h2>
-
-<p>To send a request to an XML-RPC server you must specify the following information:</p>
-
-<ul>
-<li>The URL of the server</li>
-<li>The method on the server you wish to call</li>
-<li>The <em>request</em> data (explained below).</li>
-</ul>
-
-<p>Here is a basic example that sends a simple Weblogs.com ping to the <a href="http://pingomatic.com/">Ping-o-Matic</a></p>
-
-
-<code>$this->load->library('xmlrpc');<br />
-<br />
-$this->xmlrpc->server('http://rpc.pingomatic.com/', 80);<br />
-$this->xmlrpc->method('weblogUpdates.ping');<br />
-
-<br />
-$request = array('My Photoblog', 'http://www.my-site.com/photoblog/');<br />
-$this->xmlrpc->request($request);<br />
-<br />
-if ( ! $this->xmlrpc->send_request())<br />
-{<br />
- echo $this->xmlrpc->display_error();<br />
-}</code>
-
-<h3>Explanation</h3>
-
-<p>The above code initializes the XML-RPC class, sets the server URL and method to be called (weblogUpdates.ping). The
-request (in this case, the title and URL of your site) is placed into an array for transportation, and
-compiled using the request() function.
-Lastly, the full request is sent. If the <dfn>send_request()</dfn> method returns false we will display the error message
-sent back from the XML-RPC Server.</p>
-
-<h2>Anatomy of a Request</h2>
-
-<p>An XML-RPC <dfn>request</dfn> is simply the data you are sending to the XML-RPC server. Each piece of data in a request
-is referred to as a <dfn>request parameter</dfn>. The above example has two parameters:
-The URL and title of your site. When the XML-RPC server receives your request, it will look for parameters it requires.</p>
-
-<p>Request parameters must be placed into an array for transportation, and each parameter can be one
-of seven data types (strings, numbers, dates, etc.). If your parameters are something other than strings
-you will have to include the data type in the request array.</p>
-
-<p>Here is an example of a simple array with three parameters:</p>
-
-<code>$request = array('John', 'Doe', 'www.some-site.com');<br />
-$this->xmlrpc->request($request);</code>
-
-<p>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:</p>
-
-<code>
-$request = array (<br />
- array('John', 'string'),<br />
- array('Doe', 'string'),<br />
- array(FALSE, 'boolean'),<br />
- array(12345, 'int')<br />
- );
-<br />
-$this->xmlrpc->request($request);</code>
-
-The <a href="#datatypes">Data Types</a> section below has a full list of data types.
-
-
-
-<h2>Creating an XML-RPC Server</h2>
-
-<p>An XML-RPC Server acts as a traffic cop of sorts, waiting for incoming requests and redirecting them to the
-appropriate functions for processing.</p>
-
-<p>To create your own XML-RPC server involves initializing the XML-RPC Server class in your controller where you expect the incoming
-request to appear, then setting up an array with mapping instructions so that incoming requests can be sent to the appropriate
-class and method for processing.</p>
-
-<p>Here is an example to illustrate:</p>
-
-<code>
-$this->load->library('xmlrpc');<br />
-$this->load->library('xmlrpcs');<br />
-<br />
-$config['functions']['<var>new_post</var>'] = array('function' => '<dfn>My_blog.new_entry</dfn>'),<br />
-$config['functions']['<var>update_post</var>'] = array('function' => '<dfn>My_blog.update_entry</dfn>');<br />
-$config['object'] = $this;<br />
-<br />
-$this->xmlrpcs->initialize($config);<br />
-$this->xmlrpcs->serve();</code>
-
-<p>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.</p>
-
-<p>The '<var>object</var>' 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.</p>
-
-<p>In other words, if an XML-RPC Client sends a request for the <var>new_post</var> method, your
-server will load the <dfn>My_blog</dfn> class and call the <dfn>new_entry</dfn> function.
-If the request is for the <var>update_post</var> method, your
-server will load the <dfn>My_blog</dfn> class and call the <dfn>update_entry</dfn> function.</p>
-
-<p>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.</p>
-
-<h2>Processing Server Requests</h2>
-
-<p>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.</p>
-
-<p>Using the above example, if the <var>new_post</var> method is requested, the server will expect a class
-to exist with this prototype:</p>
-
-<code>class <kbd>My_blog</kbd> extends Controller {<br />
-<br />
- function <kbd>new_post</kbd>(<var>$request</var>)<br />
- {<br />
- <br />
- }<br />
-}
-</code>
-
-<p>The <var>$request</var> 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 <em>request parameters</em> enabling you to process the request. When
-you are done you will send a <dfn>Response</dfn> back to the Client.</p>
-
-<p>Below is a real-world example, using the Blogger API. One of the methods in the Blogger API is <dfn>getUserInfo()</dfn>.
-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:</p>
-
-
-<code>class <kbd>My_blog</kbd> extends Controller {<br />
-<br />
- function <kbd>getUserInfo</kbd>(<var>$request</var>)<br />
- {<br />
-
- $username = 'smitty';<br />
- $password = 'secretsmittypass';<br /><br />
-
- $this->load->library('xmlrpc');<br />
- <br />
- $parameters = $request->output_parameters();<br />
- <br />
- if ($parameters['1'] != $username AND $parameters['2'] != $password)<br />
- {<br />
- return $this->xmlrpc->send_error_message('100', 'Invalid Access');<br />
- }<br />
- <br />
- $response = array(array('nickname' => array('Smitty','string'),<br />
- 'userid' => array('99','string'),<br />
- 'url' => array('http://yoursite.com','string'),<br />
- 'email' => array('jsmith@yoursite.com','string'),<br />
- 'lastname' => array('Smith','string'),<br />
- 'firstname' => array('John','string')<br />
- ),<br />
- 'struct');<br />
-<br />
- return $this->xmlrpc->send_response($response);<br />
- }<br />
-}
-</code>
-
-<h3>Notes:</h3>
-<p>The <dfn>output_parameters()</dfn> function 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.</p>
-
-<p>If the username and password sent by the client were not valid, and error message is returned using <dfn>send_error_message()</dfn>.</p>
-
-<p>If the operation was successful, the client will be sent back a response array containing the user's info.</p>
-
-
-<h2>Formatting a Response</h2>
-
-<p>Similar to <em>Requests</em>, <em>Responses</em> must be formatted as an array. However, unlike requests, a response is an array
-<strong>that contains a single item</strong>. 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:</p>
-
-<code>$response = array('Response data', 'array');</code>
-
-<p>Responses, however, usually contain multiple pieces of information. In order to accomplish this we must put the response into its own
-array so that the primary array continues to contain a single piece of data. Here's an example showing how this might be accomplished:</p>
-
-<code>
-$response = array (<br />
- array(<br />
- 'first_name' => array('John', 'string'),<br />
- 'last_name' => array('Doe', 'string'),<br />
- 'member_id' => array(123435, 'int'),<br />
- 'todo_list' => array(array('clean house', 'call mom', 'water plants'), 'array'),<br />
- ),<br />
- 'struct'<br />
- );
-</code>
-
-<p class="important">Notice that the above array is formatted as a <dfn>struct</dfn>. This is the most common data type for responses.</p>
-
-<p>As with Requests, a response can be one of the seven data types listed in the <a href="#datatypes">Data Types</a> section.</p>
-
-
-<h2>Sending an Error Response</h2>
-
-<p>If you need to send the client an error response you will use the following:</p>
-
-<code>return $this->xmlrpc->send_error_message('123', 'Requested data not available');</code>
-
-<p>The first parameter is the error number while the second parameter is the error message.</p>
-
-
-
-
-
-
-<h2>Creating Your Own Client and Server</h2>
-
-<p>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.</p>
-
-<h3>The Client</h3>
-
-<p>Using a text editor, create a controller called <dfn>xmlrpc_client.php</dfn>.
-In it, place this code and save it to your <samp>applications/controllers/</samp> folder:</p>
-
-<textarea class="textarea" style="width:100%" cols="50" rows="32"><?php
-
-class Xmlrpc_client extends Controller {
-
- 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>';
- }
- }
-}
-?></textarea>
-
-<p>Note: In the above code we are using a "url helper". You can find more information in the <a href="../general/helpers.html">Helpers Functions</a> page.</p>
-
-<h3>The Server</h3>
-
-<p>Using a text editor, create a controller called <dfn>xmlrpc_server.php</dfn>.
-In it, place this code and save it to your <samp>applications/controllers/</samp> folder:</p>
-
-<textarea class="textarea" style="width:100%" cols="50" rows="30"><?php
-
-class Xmlrpc_server extends Controller {
-
- function index()
- {
- $this->load->library('xmlrpc');
- $this->load->library('xmlrpcs');
-
- $config['functions']['Greetings'] = array('function' => 'Xmlrpc_server.process');
-
- $this->xmlrpcs->initialize($config);
- $this->xmlrpcs->serve();
- }
-
-
- function process($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);
- }
-}
-?></textarea>
-
-<h3>Try it!</h3>
-
-<p>Now visit the your site using a URL similar to this:</p>
-<code>example.com/index.php/<var>xmlrpc_client</var>/</code>
-
-<p>You should now see the message you sent to the server, and its response back to you.</p>
-
-<p>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" function, where a response is sent back.</p>
-
-<h2>Using Associative Arrays In a Request Parameter</h2>
-
-<p>If you wish to use an associative array in your method parameters you will need to use a struct datatype:</p>
-
-<code>$request = array(<br />
- array(<br />
- // Param 0<br />
- array(<br />
- 'name'=>'John'<br />
- ),<br />
- 'struct'<br />
- ),<br />
- array(<br />
- // Param 1<br />
- array(<br />
- 'size'=>'large',<br />
- 'shape'=>'round'<br />
- ),<br />
- 'struct'<br />
- )<br />
- );<br />
- $this->xmlrpc->request($request);</code>
-
-<p>You can retrieve the associative array when processing the request in the Server.</p>
-
-<code>$parameters = $request->output_parameters();<br />
- $name = $parameters['0']['name'];<br />
- $size = $parameters['1']['size'];<br />
- $size = $parameters['1']['shape']; </code>
-
-<h1>XML-RPC Function Reference</h1>
-
-<h2>$this->xmlrpc->server()</h2>
-<p>Sets the URL and port number of the server to which a request is to be sent:</p>
-<code>$this->xmlrpc->server('http://www.sometimes.com/pings.php', 80);</code>
-
-<h2>$this->xmlrpc->timeout()</h2>
-<p>Set a time out period (in seconds) after which the request will be canceled:</p>
-<code>$this->xmlrpc->timeout(6);</code>
-
-<h2>$this->xmlrpc->method()</h2>
-<p>Sets the method that will be requested from the XML-RPC server:</p>
-<code>$this->xmlrpc->method('<var>method</var>');</code>
-
-<p>Where <var>method</var> is the name of the method.</p>
-
-<h2>$this->xmlrpc->request()</h2>
-<p>Takes an array of data and builds request to be sent to XML-RPC server:</p>
-<code>$request = array(array('My Photoblog', 'string'), 'http://www.yoursite.com/photoblog/');<br />
-$this->xmlrpc->request($request);</code>
-
-<h2>$this->xmlrpc->send_request()</h2>
-<p>The request sending function. Returns boolean TRUE or FALSE based on success for failure, enabling it to be used conditionally.</p>
-
-<h2>$this->xmlrpc->set_debug(TRUE);</h2>
-<p>Enables debugging, which will display a variety of information and error data helpful during development.</p>
-
-
-<h2>$this->xmlrpc->display_error()</h2>
-<p>Returns an error message as a string if your request failed for some reason.</p>
-<code>echo $this->xmlrpc->display_error();</code>
-
-<h2>$this->xmlrpc->display_response()</h2>
-<p>Returns the response from the remote server once request is received. The response will typically be an associative array.</p>
-<code>$this->xmlrpc->display_response();</code>
-
-<h2>$this->xmlrpc->send_error_message()</h2>
-<p>This function 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.</p>
-<code>return $this->xmlrpc->send_error_message('123', 'Requested data not available');</code>
-
-<h2>$this->xmlrpc->send_response()</h2>
-<p>Lets you send the response from your server to the client. An array of valid data values must be sent with this method.</p>
-<code>$response = array(<br />
- array(<br />
- 'flerror' => array(FALSE, 'boolean'),<br />
- 'message' => "Thanks for the ping!")<br />
- )<br />
- 'struct');<br />
-return $this->xmlrpc->send_response($response);</code>
-
-
-<a name="datatypes"></a>
-<h2>Data Types</h2>
-
-<p>According to the <a href="http://www.xmlrpc.com/spec">XML-RPC spec</a> there are seven types
-of values that you can send via XML-RPC:</p>
-
-<ul>
-<li><em>int</em> or <em>i4</em></li>
-<li><em>boolean</em></li>
-<li><em>string</em></li>
-<li><em>double</em></li>
-<li><em>dateTime.iso8601</em></li>
-<li><em>base64</em></li>
-<li><em>struct</em> (contains array of values)</li>
-<li><em>array</em> (contains array of values)</li>
-</ul>
-
-
-</div>
-<!-- END CONTENT -->
-
-
-<div id="footer">
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Once the server receives and processes the request it +will send back a <strong>response</strong> to the client.</p> + +<p>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.</p> + +<p>For detailed specifications, you can visit the <a href="http://www.xmlrpc.com/">XML-RPC</a> site.</p> + +<h2>Initializing the Class</h2> + +<p>Like most other classes in CodeIgniter, the XML-RPC and XML-RPCS classes are initialized in your controller using the <dfn>$this->load->library</dfn> function:</p> + +<p>To load the XML-RPC class you will use:</p> +<code>$this->load->library('xmlrpc');</code> +<p>Once loaded, the xml-rpc library object will be available using: <dfn>$this->xmlrpc</dfn></p> + +<p>To load the XML-RPC Server class you will use:</p> +<code> +$this->load->library('xmlrpc');<br /> +$this->load->library('xmlrpcs'); +</code> +<p>Once loaded, the xml-rpcs library object will be available using: <dfn>$this->xmlrpcs</dfn></p> + +<p class="important"><strong>Note:</strong> When using the XML-RPC Server class you must load BOTH the XML-RPC class and the XML-RPC Server class.</p> + + + +<h2>Sending XML-RPC Requests</h2> + +<p>To send a request to an XML-RPC server you must specify the following information:</p> + +<ul> +<li>The URL of the server</li> +<li>The method on the server you wish to call</li> +<li>The <em>request</em> data (explained below).</li> +</ul> + +<p>Here is a basic example that sends a simple Weblogs.com ping to the <a href="http://pingomatic.com/">Ping-o-Matic</a></p> + + +<code>$this->load->library('xmlrpc');<br /> +<br /> +$this->xmlrpc->server('http://rpc.pingomatic.com/', 80);<br /> +$this->xmlrpc->method('weblogUpdates.ping');<br /> + +<br /> +$request = array('My Photoblog', 'http://www.my-site.com/photoblog/');<br /> +$this->xmlrpc->request($request);<br /> +<br /> +if ( ! $this->xmlrpc->send_request())<br /> +{<br /> + echo $this->xmlrpc->display_error();<br /> +}</code> + +<h3>Explanation</h3> + +<p>The above code initializes the XML-RPC class, sets the server URL and method to be called (weblogUpdates.ping). The +request (in this case, the title and URL of your site) is placed into an array for transportation, and +compiled using the request() function. +Lastly, the full request is sent. If the <dfn>send_request()</dfn> method returns false we will display the error message +sent back from the XML-RPC Server.</p> + +<h2>Anatomy of a Request</h2> + +<p>An XML-RPC <dfn>request</dfn> is simply the data you are sending to the XML-RPC server. Each piece of data in a request +is referred to as a <dfn>request parameter</dfn>. The above example has two parameters: +The URL and title of your site. When the XML-RPC server receives your request, it will look for parameters it requires.</p> + +<p>Request parameters must be placed into an array for transportation, and each parameter can be one +of seven data types (strings, numbers, dates, etc.). If your parameters are something other than strings +you will have to include the data type in the request array.</p> + +<p>Here is an example of a simple array with three parameters:</p> + +<code>$request = array('John', 'Doe', 'www.some-site.com');<br /> +$this->xmlrpc->request($request);</code> + +<p>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:</p> + +<code> +$request = array (<br /> + array('John', 'string'),<br /> + array('Doe', 'string'),<br /> + array(FALSE, 'boolean'),<br /> + array(12345, 'int')<br /> + ); +<br /> +$this->xmlrpc->request($request);</code> + +The <a href="#datatypes">Data Types</a> section below has a full list of data types. + + + +<h2>Creating an XML-RPC Server</h2> + +<p>An XML-RPC Server acts as a traffic cop of sorts, waiting for incoming requests and redirecting them to the +appropriate functions for processing.</p> + +<p>To create your own XML-RPC server involves initializing the XML-RPC Server class in your controller where you expect the incoming +request to appear, then setting up an array with mapping instructions so that incoming requests can be sent to the appropriate +class and method for processing.</p> + +<p>Here is an example to illustrate:</p> + +<code> +$this->load->library('xmlrpc');<br /> +$this->load->library('xmlrpcs');<br /> +<br /> +$config['functions']['<var>new_post</var>'] = array('function' => '<dfn>My_blog.new_entry</dfn>'),<br /> +$config['functions']['<var>update_post</var>'] = array('function' => '<dfn>My_blog.update_entry</dfn>');<br /> +$config['object'] = $this;<br /> +<br /> +$this->xmlrpcs->initialize($config);<br /> +$this->xmlrpcs->serve();</code> + +<p>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.</p> + +<p>The '<var>object</var>' 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.</p> + +<p>In other words, if an XML-RPC Client sends a request for the <var>new_post</var> method, your +server will load the <dfn>My_blog</dfn> class and call the <dfn>new_entry</dfn> function. +If the request is for the <var>update_post</var> method, your +server will load the <dfn>My_blog</dfn> class and call the <dfn>update_entry</dfn> function.</p> + +<p>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.</p> + +<h2>Processing Server Requests</h2> + +<p>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.</p> + +<p>Using the above example, if the <var>new_post</var> method is requested, the server will expect a class +to exist with this prototype:</p> + +<code>class <kbd>My_blog</kbd> extends Controller {<br /> +<br /> + function <kbd>new_post</kbd>(<var>$request</var>)<br /> + {<br /> + <br /> + }<br /> +} +</code> + +<p>The <var>$request</var> 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 <em>request parameters</em> enabling you to process the request. When +you are done you will send a <dfn>Response</dfn> back to the Client.</p> + +<p>Below is a real-world example, using the Blogger API. One of the methods in the Blogger API is <dfn>getUserInfo()</dfn>. +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:</p> + + +<code>class <kbd>My_blog</kbd> extends Controller {<br /> +<br /> + function <kbd>getUserInfo</kbd>(<var>$request</var>)<br /> + {<br /> + + $username = 'smitty';<br /> + $password = 'secretsmittypass';<br /><br /> + + $this->load->library('xmlrpc');<br /> + <br /> + $parameters = $request->output_parameters();<br /> + <br /> + if ($parameters['1'] != $username AND $parameters['2'] != $password)<br /> + {<br /> + return $this->xmlrpc->send_error_message('100', 'Invalid Access');<br /> + }<br /> + <br /> + $response = array(array('nickname' => array('Smitty','string'),<br /> + 'userid' => array('99','string'),<br /> + 'url' => array('http://yoursite.com','string'),<br /> + 'email' => array('jsmith@yoursite.com','string'),<br /> + 'lastname' => array('Smith','string'),<br /> + 'firstname' => array('John','string')<br /> + ),<br /> + 'struct');<br /> +<br /> + return $this->xmlrpc->send_response($response);<br /> + }<br /> +} +</code> + +<h3>Notes:</h3> +<p>The <dfn>output_parameters()</dfn> function 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.</p> + +<p>If the username and password sent by the client were not valid, and error message is returned using <dfn>send_error_message()</dfn>.</p> + +<p>If the operation was successful, the client will be sent back a response array containing the user's info.</p> + + +<h2>Formatting a Response</h2> + +<p>Similar to <em>Requests</em>, <em>Responses</em> must be formatted as an array. However, unlike requests, a response is an array +<strong>that contains a single item</strong>. 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:</p> + +<code>$response = array('Response data', 'array');</code> + +<p>Responses, however, usually contain multiple pieces of information. In order to accomplish this we must put the response into its own +array so that the primary array continues to contain a single piece of data. Here's an example showing how this might be accomplished:</p> + +<code> +$response = array (<br /> + array(<br /> + 'first_name' => array('John', 'string'),<br /> + 'last_name' => array('Doe', 'string'),<br /> + 'member_id' => array(123435, 'int'),<br /> + 'todo_list' => array(array('clean house', 'call mom', 'water plants'), 'array'),<br /> + ),<br /> + 'struct'<br /> + ); +</code> + +<p class="important">Notice that the above array is formatted as a <dfn>struct</dfn>. This is the most common data type for responses.</p> + +<p>As with Requests, a response can be one of the seven data types listed in the <a href="#datatypes">Data Types</a> section.</p> + + +<h2>Sending an Error Response</h2> + +<p>If you need to send the client an error response you will use the following:</p> + +<code>return $this->xmlrpc->send_error_message('123', 'Requested data not available');</code> + +<p>The first parameter is the error number while the second parameter is the error message.</p> + + + + + + +<h2>Creating Your Own Client and Server</h2> + +<p>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.</p> + +<h3>The Client</h3> + +<p>Using a text editor, create a controller called <dfn>xmlrpc_client.php</dfn>. +In it, place this code and save it to your <samp>applications/controllers/</samp> folder:</p> + +<textarea class="textarea" style="width:100%" cols="50" rows="32"><?php + +class Xmlrpc_client extends Controller { + + 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>'; + } + } +} +?></textarea> + +<p>Note: In the above code we are using a "url helper". You can find more information in the <a href="../general/helpers.html">Helpers Functions</a> page.</p> + +<h3>The Server</h3> + +<p>Using a text editor, create a controller called <dfn>xmlrpc_server.php</dfn>. +In it, place this code and save it to your <samp>applications/controllers/</samp> folder:</p> + +<textarea class="textarea" style="width:100%" cols="50" rows="30"><?php + +class Xmlrpc_server extends Controller { + + function index() + { + $this->load->library('xmlrpc'); + $this->load->library('xmlrpcs'); + + $config['functions']['Greetings'] = array('function' => 'Xmlrpc_server.process'); + + $this->xmlrpcs->initialize($config); + $this->xmlrpcs->serve(); + } + + + function process($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); + } +} +?></textarea> + +<h3>Try it!</h3> + +<p>Now visit the your site using a URL similar to this:</p> +<code>example.com/index.php/<var>xmlrpc_client</var>/</code> + +<p>You should now see the message you sent to the server, and its response back to you.</p> + +<p>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" function, where a response is sent back.</p> + +<h2>Using Associative Arrays In a Request Parameter</h2> + +<p>If you wish to use an associative array in your method parameters you will need to use a struct datatype:</p> + +<code>$request = array(<br /> + array(<br /> + // Param 0<br /> + array(<br /> + 'name'=>'John'<br /> + ),<br /> + 'struct'<br /> + ),<br /> + array(<br /> + // Param 1<br /> + array(<br /> + 'size'=>'large',<br /> + 'shape'=>'round'<br /> + ),<br /> + 'struct'<br /> + )<br /> + );<br /> + $this->xmlrpc->request($request);</code> + +<p>You can retrieve the associative array when processing the request in the Server.</p> + +<code>$parameters = $request->output_parameters();<br /> + $name = $parameters['0']['name'];<br /> + $size = $parameters['1']['size'];<br /> + $size = $parameters['1']['shape']; </code> + +<h1>XML-RPC Function Reference</h1> + +<h2>$this->xmlrpc->server()</h2> +<p>Sets the URL and port number of the server to which a request is to be sent:</p> +<code>$this->xmlrpc->server('http://www.sometimes.com/pings.php', 80);</code> + +<h2>$this->xmlrpc->timeout()</h2> +<p>Set a time out period (in seconds) after which the request will be canceled:</p> +<code>$this->xmlrpc->timeout(6);</code> + +<h2>$this->xmlrpc->method()</h2> +<p>Sets the method that will be requested from the XML-RPC server:</p> +<code>$this->xmlrpc->method('<var>method</var>');</code> + +<p>Where <var>method</var> is the name of the method.</p> + +<h2>$this->xmlrpc->request()</h2> +<p>Takes an array of data and builds request to be sent to XML-RPC server:</p> +<code>$request = array(array('My Photoblog', 'string'), 'http://www.yoursite.com/photoblog/');<br /> +$this->xmlrpc->request($request);</code> + +<h2>$this->xmlrpc->send_request()</h2> +<p>The request sending function. Returns boolean TRUE or FALSE based on success for failure, enabling it to be used conditionally.</p> + +<h2>$this->xmlrpc->set_debug(TRUE);</h2> +<p>Enables debugging, which will display a variety of information and error data helpful during development.</p> + + +<h2>$this->xmlrpc->display_error()</h2> +<p>Returns an error message as a string if your request failed for some reason.</p> +<code>echo $this->xmlrpc->display_error();</code> + +<h2>$this->xmlrpc->display_response()</h2> +<p>Returns the response from the remote server once request is received. The response will typically be an associative array.</p> +<code>$this->xmlrpc->display_response();</code> + +<h2>$this->xmlrpc->send_error_message()</h2> +<p>This function 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.</p> +<code>return $this->xmlrpc->send_error_message('123', 'Requested data not available');</code> + +<h2>$this->xmlrpc->send_response()</h2> +<p>Lets you send the response from your server to the client. An array of valid data values must be sent with this method.</p> +<code>$response = array(<br /> + array(<br /> + 'flerror' => array(FALSE, 'boolean'),<br /> + 'message' => "Thanks for the ping!")<br /> + )<br /> + 'struct');<br /> +return $this->xmlrpc->send_response($response);</code> + + +<a name="datatypes"></a> +<h2>Data Types</h2> + +<p>According to the <a href="http://www.xmlrpc.com/spec">XML-RPC spec</a> there are seven types +of values that you can send via XML-RPC:</p> + +<ul> +<li><em>int</em> or <em>i4</em></li> +<li><em>boolean</em></li> +<li><em>string</em></li> +<li><em>double</em></li> +<li><em>dateTime.iso8601</em></li> +<li><em>base64</em></li> +<li><em>struct</em> (contains array of values)</li> +<li><em>array</em> (contains array of values)</li> +</ul> + + +</div> +<!-- END CONTENT --> + + +<div id="footer"> +<p> +Previous Topic: <a href="user_agent.html">User Agent Class</a> + · +<a href="#top">Top of Page</a> · +<a href="../index.html">User Guide Home</a> · +Next Topic: <a href="zip.html">Zip Encoding Class</a> +</p> +<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006-2008 · <a href="http://ellislab.com/">Ellislab, Inc.</a></p> +</div> + +</body> </html>
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