ZF Snippets

Mailto Obfuscator

<?php

class Vendor_View_Filter_ObfuscateMailto implements Zend_Filter_Interface
{
	/**
	 * Regex to find mailto links
	 * Note that it only finds the links,
	 * it does not care about the validity of the email-address
	 *
	 * @var string
	 */
	protected $_pattern = '/<a(.*)href="mailto:([^"]*)"(.*)>(.*)<\/a>/iu';
	
	/**
	 * Defined in Zend_Filter_Interface
	 *
	 * @param	mixed	$value	Value to filter
	 * @return	mixed			Filtered value
	 */
	public function filter($value)
	{
		return preg_replace_callback($this->_pattern, array($this, '_obfuscate'), $value);
	}
	
	/**
	 * Obfuscates found mailto links to encoded javascript
	 *
	 * @param	array	$matches	Matches from regex
	 * @return	string				Obfuscated mailto link
	 */
	protected function _obfuscate(array $matches)
	{
		// javascript to be executed
		$javascript = "document.write('". $matches[0] ."')";
		
		// empty string that will hold encoded version of javascript 
		$encodedJavascript = '';
		
		// encode each character from $javascript to hex and append it to $encodedJavascript
		for($i = 0; $i < strlen($javascript); $i++) {
			$encodedJavascript .= '%' . bin2hex($javascript[$i]);
		}
		
		// return as html script-tag
		return '<script type="text/javascript">eval(unescape(\''. $encodedJavascript .'\'))</script>';
	}
}

$view->addFilterPath('Vendor/View/Filter', 'Vendor_View_Filter');
$view->addFilter('ObfuscateMailto');

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