Added support to exotic timestamp format

src/TrustedTimestamps.php

@@ -5,6 +5,7 @@
 
 namespace TrustedTimestamps;
 
+use DateTime;
 use Exception;
 
 /**
@@ -71,10 +72,11 @@ public static function createRequestfile($hash, $hash_algo = 'sha1')
  * @param string $requestfile_path : The path to the Timestamp Requestfile as created by createRequestfile
  * @param string $tsa_url : URL of a TSA such as http://zeitstempel.dfn.de
  * @param array $curlOpts you may pass additionnal Curl options: ex [CURLOPT_USERPWD => 'mylogin:mypass']
+ * @param null|string $timestamp_format
  * @return array of response_string with the unix-timetamp of the timestamp response and the base64-encoded response_string
  * @throws Exception
  */
- public static function signRequestfile($requestfile_path, $tsa_url, array $curlOpts = array())
+ public static function signRequestfile($requestfile_path, $tsa_url, array $curlOpts = array(), $timestamp_format = null)
  {
  if (!file_exists($requestfile_path)) {
  throw new Exception("The Requestfile was not found");
@@ -105,7 +107,7 @@ public static function signRequestfile($requestfile_path, $tsa_url, array $curlO
 
  $base64_response_string = base64_encode($binary_response_string);
 
- $response_time = self::getTimestampFromAnswer($base64_response_string);
+ $response_time = self::getTimestampFromAnswer($base64_response_string, $timestamp_format);
 
  return array("response_string" => $base64_response_string,
  "response_time" => $response_time);
@@ -115,10 +117,11 @@ public static function signRequestfile($requestfile_path, $tsa_url, array $curlO
  * Extracts the unix timestamp from the base64-encoded response string as returned by signRequestfile
  *
  * @param string $base64_response_string : Response string as returned by signRequestfile
+ * @param null|string $timestamp_format
  * @return int: unix timestamp
  * @throws Exception
  */
- public static function getTimestampFromAnswer($base64_response_string)
+ public static function getTimestampFromAnswer($base64_response_string, $timestamp_format = null)
  {
  $binary_response_string = base64_decode($base64_response_string);
 
@@ -145,7 +148,10 @@ public static function getTimestampFromAnswer($base64_response_string)
  */
  foreach ($retarray as $retline) {
  if (preg_match("~^Time\sstamp\:\s(.*)~", $retline, $matches)) {
- $response_time = strtotime($matches[1]);
+ $response_time = empty($timestamp_format)
+ ? strtotime($matches[1])
+ : DateTime::createFromFormat($timestamp_format, trim($matches[1]))
+ ->getTimestamp();
  break;
  }
  }