better-testing

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;
			}

			}