RequestValidator.php
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RequestValidator.php
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	<?php

	class Services_Twilio_RequestValidator
	{

	protected $AuthToken;

	function __construct($token)
	{
	$this->AuthToken = $token;
	}

	public function computeSignature($url, $data = array())
	{
	// sort the array by keys
	ksort($data);

	// append them to the data string in order
	// with no delimiters
	foreach($data as $key => $value)
	$url .= "$key$value";

	// This function calculates the HMAC hash of the data with the key
	// passed in
	// Note: hash_hmac requires PHP 5 >= 5.1.2 or PECL hash:1.1-1.5
	// Or http://pear.php.net/package/Crypt_HMAC/
	return base64_encode(hash_hmac("sha1", $url, $this->AuthToken, true));
	}

	public function validate($expectedSignature, $url, $data = array())
	{
	return $this->computeSignature($url, $data)
	== $expectedSignature;
	}

	}