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POfilter methods in a controller
 

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  1. POfilter methods in a controller
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    <p>I want to create a filter for my add, update, and delete actions in my controllers to automatically check if they</p> <ol> <li>were called in a POST, as opposed to GET or some other method</li> <li>and have the pageInstanceIDs which I set in the forms on my views <ul> <li>protects against xss</li> <li>protects against double submission of a form <ul> <li>from submit button double click</li> <li>from back button pressed after a submision</li> <li>from a url being saved or bookmarked </li> </ul></li> </ul></li> </ol> <p>Currently I extended \lithium\action\Controller using an AppController and have my add, update, and delete actions defined in there. I also have a boolean function in my AppController that checks if the appropriate pageInstanceIDs are in session or not.</p> <p>Below is my code:</p> <pre><code>public function isNotPostBack() { // pull in the session $pageInstanceIDs = Session::read('pageInstanceIDs'); $pageInstanceID = uniqid('', true); $this-&gt;set(compact('pageInstanceID')); $pageInstanceIDs[] = $pageInstanceID; Session::write('pageInstanceIDs', $pageInstanceIDs); // checks if this is a save operation if ($this-&gt;request-&gt;data){ $pageInstanceIDs = Session::read('pageInstanceIDs'); $pageIDIndex = array_search($this-&gt;request-&gt;data['pageInstanceID'], $pageInstanceIDs); if ($pageIDIndex !== false) { // remove the key unset($pageInstanceIDs[$pageIDIndex]); Session::write('pageInstanceIDs', $pageInstanceIDs); return true; } else return false; } else { return true; } } public function add() { if (!$this-&gt;request-&gt;is('post') &amp;&amp; exist($this-&gt;request-&gt;data())) { $msg = "Add can only be called with http:post."; throw new DispatchException($msg); } } </code></pre> <p>Then in my controllers I inherit from AppController and implement the action like so:</p> <pre><code>public function add() { parent::add(); if (parent::isNotPostBack()){ //do work } return $this-&gt;render(array('layout' =&gt; false)); } </code></pre> <p>which will ensure that the form used a POST and was <strong>not double submitted</strong> (back button or click happy users). This also helps protect against XSS.</p> <p>I'm aware there is a plugin for this, but I want to implement this as a filter so that my controller methods are cleaner. Implented this way, the only code in my actions are the //do work portion and the return statement.</p>
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    1. USton.yeung
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    1. COI think you forgot the question...
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      1. USjeroen
    2. CO@jeroen The question is in the first sentence, i guess its more of a statement of desire? I want to know how to create a filter on controller methods.
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      1. USton.yeung
 

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