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diff --git a/XHubSignature.php b/XHubSignature.php
index cba698b..ad2e645 100644
--- a/XHubSignature.php
+++ b/XHubSignature.php
@@ -1,147 +1,151 @@
<?php
namespace Keruald\GitHub;
class XHubSignature {
///
/// Properties
///
/**
* The secret token to secure messages
*
* @var string
*/
private $secret;
/**
* The hash algorithm
*
* @var string
*/
private $hashAlgo;
/**
* The payload
*
* @var string
*/
public $payload;
/**
* The signature delivered with the payload, to validate it
*
* @var string
*/
public $signature;
///
/// Constants
///
/**
* The default hash algorithm to use if none is offered
*/
const DEFAULT_HASH_ALGO = 'sha1';
///
/// Constructor
///
/**
* Initializes a new instance of the XHubSignature class
*
* @param string $secret the secret token
* @param string $algo the algorithm to use to compute hashs [facultative]
*/
public function __construct ($secret, $algo = self::DEFAULT_HASH_ALGO) {
$this->secret = $secret;
$this->hashAlgo = $algo;
}
///
/// Signature methods
///
/**
* Computes the signature for the current payload
*
* @return string the payload signature
*/
public function compute () {
return hash_hmac($this->hashAlgo, $this->payload, $this->secret);
}
/**
* Validates the signature
*
* @return bool true if the signature is correct; otherwise, false.
*/
public function validate () {
// Comparison with hash_equals allows to mitigate timing attacks.
return hash_equals($this->compute(), $this->signature);
}
///
/// Static helper methods
///
/**
* Computes a signature for the specified secret and payload
*
* @param string $secret the secret token to secure messages
* @param string $payload the payload
* @param string $algo the hash algorithm [facultative]
*
* @return string the payload signature
*/
public static function hashPayload(
$secret,
$payload,
$algo = self::DEFAULT_HASH_ALGO
) {
$instance = new static($secret, $algo);
$instance->payload = $payload;
return $instance->compute();
}
/**
* Validates a payload against specified secret
*
* @param string $secret the secret token to secure messages
* @param string $payload the payload
* @param string $signature the signature delivered with the payload
* @param string $algo the hash algorithm [facultative]
*
* @return bool true if the signature is correct; otherwise, false.
*/
public static function validatePayload (
$secret,
$payload,
$signature,
$algo = self::DEFAULT_HASH_ALGO
) {
$instance = new static($secret, $algo);
$instance->payload = $payload;
$instance->signature = $signature;
return $instance->validate();
}
/**
* Parses a X-Hub-Signature field from headers and gets the signature part
*
* @param string $header the header value
* @return string the signature
*/
public static function parseSignature ($header) {
+ if ($header === null) {
+ return "";
+ }
+
if (strpos($header, '=') === false) {
return $header;
}
$data = explode('=', $header, 2);
return $data[1];
}
}

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